lib: remove support for CURL_DOES_CONVERSIONS

TPF was the only user and support for that was dropped.

Closes #8378

55 files changed, 135 insertions, 1219 deletions

diff --git a/lib/Makefile.inc b/lib/Makefile.inc
index fedd70a16..74e600742 100644
--- a/lib/Makefile.inc
+++ b/lib/Makefile.inc
@@ -168,7 +168,6 @@ LIB_CFILES =         \
   mqtt.c             \
   multi.c            \
   netrc.c            \
-  non-ascii.c        \
   nonblock.c         \
   openldap.c         \
   parsedate.c        \
@@ -289,7 +288,6 @@ LIB_HFILES =         \
   multihandle.h      \
   multiif.h          \
   netrc.h            \
-  non-ascii.h        \
   nonblock.h         \
   parsedate.h        \
   pingpong.h         \
diff --git a/lib/base64.c b/lib/base64.c
index 527e29955..960a1ca3a 100644
--- a/lib/base64.c
+++ b/lib/base64.c
@@ -34,7 +34,6 @@
 #include "urldata.h" /* for the Curl_easy definition */
 #include "warnless.h"
 #include "curl_base64.h"
-#include "non-ascii.h"
 
 /* The last 3 #include files should be in this order */
 #include "curl_printf.h"
@@ -176,19 +175,15 @@ CURLcode Curl_base64_decode(const char *src,
 }
 
 static CURLcode base64_encode(const char *table64,
-                              struct Curl_easy *data,
                               const char *inputbuff, size_t insize,
                               char **outptr, size_t *outlen)
 {
-  CURLcode result;
   unsigned char ibuf[3];
   unsigned char obuf[4];
   int i;
   int inputparts;
   char *output;
   char *base64data;
-  char *convbuf = NULL;
-
   const char *indata = inputbuff;
 
   *outptr = NULL;
@@ -206,20 +201,6 @@ static CURLcode base64_encode(const char *table64,
   if(!output)
     return CURLE_OUT_OF_MEMORY;
 
-  /*
-   * The base64 data needs to be created using the network encoding
-   * not the host encoding.  And we can't change the actual input
-   * so we copy it to a buffer, translate it, and use that instead.
-   */
-  result = Curl_convert_clone(data, indata, insize, &convbuf);
-  if(result) {
-    free(output);
-    return result;
-  }
-
-  if(convbuf)
-    indata = (char *)convbuf;
-
   while(insize > 0) {
     for(i = inputparts = 0; i < 3; i++) {
       if(insize > 0) {
@@ -270,8 +251,6 @@ static CURLcode base64_encode(const char *table64,
   /* Return the pointer to the new data (allocated memory) */
   *outptr = base64data;
 
-  free(convbuf);
-
   /* Return the length of the new data */
   *outlen = output - base64data;
 
@@ -295,11 +274,10 @@ static CURLcode base64_encode(const char *table64,
  *
  * @unittest: 1302
  */
-CURLcode Curl_base64_encode(struct Curl_easy *data,
-                            const char *inputbuff, size_t insize,
+CURLcode Curl_base64_encode(const char *inputbuff, size_t insize,
                             char **outptr, size_t *outlen)
 {
-  return base64_encode(base64, data, inputbuff, insize, outptr, outlen);
+  return base64_encode(base64, inputbuff, insize, outptr, outlen);
 }
 
 /*
@@ -319,11 +297,10 @@ CURLcode Curl_base64_encode(struct Curl_easy *data,
  *
  * @unittest: 1302
  */
-CURLcode Curl_base64url_encode(struct Curl_easy *data,
-                               const char *inputbuff, size_t insize,
+CURLcode Curl_base64url_encode(const char *inputbuff, size_t insize,
                                char **outptr, size_t *outlen)
 {
-  return base64_encode(base64url, data, inputbuff, insize, outptr, outlen);
+  return base64_encode(base64url, inputbuff, insize, outptr, outlen);
 }
 
 #endif /* no users so disabled */
diff --git a/lib/curl_base64.h b/lib/curl_base64.h
index d48edc424..4cb9d7353 100644
--- a/lib/curl_base64.h
+++ b/lib/curl_base64.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -22,13 +22,10 @@
  *
  ***************************************************************************/
 
-CURLcode Curl_base64_encode(struct Curl_easy *data,
-                            const char *inputbuff, size_t insize,
+CURLcode Curl_base64_encode(const char *inputbuff, size_t insize,
                             char **outptr, size_t *outlen);
-CURLcode Curl_base64url_encode(struct Curl_easy *data,
-                               const char *inputbuff, size_t insize,
+CURLcode Curl_base64url_encode(const char *inputbuff, size_t insize,
                                char **outptr, size_t *outlen);
-
 CURLcode Curl_base64_decode(const char *src,
                             unsigned char **outptr, size_t *outlen);
 
diff --git a/lib/curl_ctype.c b/lib/curl_ctype.c
index d6cd08a07..233a69e76 100644
--- a/lib/curl_ctype.c
+++ b/lib/curl_ctype.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -22,8 +22,6 @@
 
 #include "curl_setup.h"
 
-#ifndef CURL_DOES_CONVERSIONS
-
 #undef _U
 #define _U (1<<0) /* upper case */
 #undef _L
@@ -130,4 +128,3 @@ int Curl_iscntrl(int c)
   return (ascii[c] & (_C));
 }
 
-#endif /* !CURL_DOES_CONVERSIONS */
diff --git a/lib/curl_ctype.h b/lib/curl_ctype.h
index 17dfaa094..2fa749dca 100644
--- a/lib/curl_ctype.h
+++ b/lib/curl_ctype.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -24,32 +24,6 @@
 
 #include "curl_setup.h"
 
-#ifdef CURL_DOES_CONVERSIONS
-
-/*
- * Uppercase macro versions of ANSI/ISO is*() functions/macros which
- * avoid negative number inputs with argument byte codes > 127.
- *
- * For non-ASCII platforms the C library character classification routines
- * are used despite being locale-dependent, because this is better than
- * not to work at all.
- */
-#include <ctype.h>
-
-#define ISSPACE(x)  (isspace((int)  ((unsigned char)x)))
-#define ISDIGIT(x)  (isdigit((int)  ((unsigned char)x)))
-#define ISALNUM(x)  (isalnum((int)  ((unsigned char)x)))
-#define ISXDIGIT(x) (isxdigit((int) ((unsigned char)x)))
-#define ISGRAPH(x)  (isgraph((int)  ((unsigned char)x)))
-#define ISALPHA(x)  (isalpha((int)  ((unsigned char)x)))
-#define ISPRINT(x)  (isprint((int)  ((unsigned char)x)))
-#define ISUPPER(x)  (isupper((int)  ((unsigned char)x)))
-#define ISLOWER(x)  (islower((int)  ((unsigned char)x)))
-#define ISCNTRL(x)  (iscntrl((int)  ((unsigned char)x)))
-#define ISASCII(x)  (isascii((int)  ((unsigned char)x)))
-
-#else
-
 int Curl_isspace(int c);
 int Curl_isdigit(int c);
 int Curl_isalnum(int c);
@@ -73,8 +47,6 @@ int Curl_iscntrl(int c);
 #define ISCNTRL(x)  (Curl_iscntrl((int)  ((unsigned char)x)))
 #define ISASCII(x)  (((x) >= 0) && ((x) <= 0x80))
 
-#endif
-
 #define ISBLANK(x)  (int)((((unsigned char)x) == ' ') ||        \
                           (((unsigned char)x) == '\t'))
 
diff --git a/lib/curl_ntlm_core.c b/lib/curl_ntlm_core.c
index ed123d0c1..d1387ee72 100644
--- a/lib/curl_ntlm_core.c
+++ b/lib/curl_ntlm_core.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -108,7 +108,6 @@
 #endif
 
 #include "urldata.h"
-#include "non-ascii.h"
 #include "strcase.h"
 #include "curl_ntlm_core.h"
 #include "curl_md5.h"
@@ -402,11 +401,9 @@ void Curl_ntlm_core_lm_resp(const unsigned char *keys,
 /*
  * Set up lanmanager hashed password
  */
-CURLcode Curl_ntlm_core_mk_lm_hash(struct Curl_easy *data,
-                                   const char *password,
+CURLcode Curl_ntlm_core_mk_lm_hash(const char *password,
                                    unsigned char *lmbuffer /* 21 bytes */)
 {
-  CURLcode result;
   unsigned char pw[14];
   static const unsigned char magic[] = {
     0x4B, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25 /* i.e. KGS!@#$% */
@@ -416,14 +413,6 @@ CURLcode Curl_ntlm_core_mk_lm_hash(struct Curl_easy *data,
   Curl_strntoupper((char *)pw, password, len);
   memset(&pw[len], 0, 14 - len);
 
-  /*
-   * The LanManager hashed password needs to be created using the
-   * password in the network encoding not the host encoding.
-   */
-  result = Curl_convert_to_network(data, (char *)pw, 14);
-  if(result)
-    return result;
-
   {
     /* Create LanManager hashed password. */
 
@@ -484,13 +473,11 @@ static void ascii_uppercase_to_unicode_le(unsigned char *dest,
  * Set up nt hashed passwords
  * @unittest: 1600
  */
-CURLcode Curl_ntlm_core_mk_nt_hash(struct Curl_easy *data,
-                                   const char *password,
+CURLcode Curl_ntlm_core_mk_nt_hash(const char *password,
                                    unsigned char *ntbuffer /* 21 bytes */)
 {
   size_t len = strlen(password);
   unsigned char *pw;
-  CURLcode result;
   if(len > SIZE_T_MAX/2) /* avoid integer overflow */
     return CURLE_OUT_OF_MEMORY;
   pw = len ? malloc(len * 2) : (unsigned char *)strdup("");
@@ -499,19 +486,13 @@ CURLcode Curl_ntlm_core_mk_nt_hash(struct Curl_easy *data,
 
   ascii_to_unicode_le(pw, password, len);
 
-  /*
-   * The NT hashed password needs to be created using the password in the
-   * network encoding not the host encoding.
-   */
-  result = Curl_convert_to_network(data, (char *)pw, len * 2);
-  if(!result) {
-    /* Create NT hashed password. */
-    Curl_md4it(ntbuffer, pw, 2 * len);
-    memset(ntbuffer + 16, 0, 21 - 16);
-  }
+  /* Create NT hashed password. */
+  Curl_md4it(ntbuffer, pw, 2 * len);
+  memset(ntbuffer + 16, 0, 21 - 16);
+
   free(pw);
 
-  return result;
+  return CURLE_OK;
 }
 
 #if defined(USE_NTLM_V2) && !defined(USE_WINDOWS_SSPI)
diff --git a/lib/curl_ntlm_core.h b/lib/curl_ntlm_core.h
index 02b39d485..957d9cbfe 100644
--- a/lib/curl_ntlm_core.h
+++ b/lib/curl_ntlm_core.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -67,13 +67,11 @@ void Curl_ntlm_core_lm_resp(const unsigned char *keys,
                             const unsigned char *plaintext,
                             unsigned char *results);
 
-CURLcode Curl_ntlm_core_mk_lm_hash(struct Curl_easy *data,
-                                   const char *password,
+CURLcode Curl_ntlm_core_mk_lm_hash(const char *password,
                                    unsigned char *lmbuffer /* 21 bytes */);
 
 #ifdef USE_NTRESPONSES
-CURLcode Curl_ntlm_core_mk_nt_hash(struct Curl_easy *data,
-                                   const char *password,
+CURLcode Curl_ntlm_core_mk_nt_hash(const char *password,
                                    unsigned char *ntbuffer /* 21 bytes */);
 
 #if defined(USE_NTLM_V2) && !defined(USE_WINDOWS_SSPI)
diff --git a/lib/curl_path.c b/lib/curl_path.c
index 65106188c..a1669d12f 100644
--- a/lib/curl_path.c
+++ b/lib/curl_path.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -40,7 +40,7 @@ CURLcode Curl_getworkingpath(struct Curl_easy *data,
   char *working_path;
   size_t working_path_len;
   CURLcode result =
-    Curl_urldecode(data, data->state.up.path, 0, &working_path,
+    Curl_urldecode(data->state.up.path, 0, &working_path,
                    &working_path_len, REJECT_ZERO);
   if(result)
     return result;
diff --git a/lib/curl_sasl.c b/lib/curl_sasl.c
index 8d39e4f81..bf2484ef0 100644
--- a/lib/curl_sasl.c
+++ b/lib/curl_sasl.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 2012 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 2012 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -48,7 +48,6 @@
 #include "warnless.h"
 #include "strtok.h"
 #include "sendf.h"
-#include "non-ascii.h" /* included for Curl_convert_... prototypes */
 /* The last 3 #include files should be in this order */
 #include "curl_printf.h"
 #include "curl_memory.h"
@@ -283,8 +282,7 @@ static CURLcode get_server_message(struct SASL *sasl, struct Curl_easy *data,
 }
 
 /* Encode the outgoing SASL message. */
-static CURLcode build_message(struct SASL *sasl, struct Curl_easy *data,
-                              struct bufref *msg)
+static CURLcode build_message(struct SASL *sasl, struct bufref *msg)
 {
   CURLcode result = CURLE_OK;
 
@@ -297,7 +295,7 @@ static CURLcode build_message(struct SASL *sasl, struct Curl_easy *data,
       char *base64;
       size_t base64len;
 
-      result = Curl_base64_encode(data, (const char *) Curl_bufref_ptr(msg),
+      result = Curl_base64_encode((const char *) Curl_bufref_ptr(msg),
                                   Curl_bufref_len(msg), &base64, &base64len);
       if(!result)
         Curl_bufref_set(msg, base64, base64len, curl_free);
@@ -494,7 +492,7 @@ CURLcode Curl_sasl_start(struct SASL *sasl, struct Curl_easy *data,
   if(!result && mech) {
     sasl->curmech = mech;
     if(Curl_bufref_ptr(&resp))
-      result = build_message(sasl, data, &resp);
+      result = build_message(sasl, &resp);
 
     if(sasl->params->maxirlen &&
        strlen(mech) + Curl_bufref_len(&resp) > sasl->params->maxirlen)
@@ -729,7 +727,7 @@ CURLcode Curl_sasl_continue(struct SASL *sasl, struct Curl_easy *data,
     newstate = SASL_CANCEL;
     break;
   case CURLE_OK:
-    result = build_message(sasl, data, &resp);
+    result = build_message(sasl, &resp);
     if(!result)
       result = sasl->params->contauth(data, sasl->curmech, &resp);
     break;
diff --git a/lib/dict.c b/lib/dict.c
index 5d53b8f1f..73b0e3176 100644
--- a/lib/dict.c
+++ b/lib/dict.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -96,13 +96,13 @@ const struct Curl_handler Curl_handler_dict = {
   PROTOPT_NONE | PROTOPT_NOURLQUERY     /* flags */
 };
 
-static char *unescape_word(struct Curl_easy *data, const char *inputbuff)
+static char *unescape_word(const char *inputbuff)
 {
   char *newp = NULL;
   char *dictp;
   size_t len;
 
-  CURLcode result = Curl_urldecode(data, inputbuff, 0, &newp, &len,
+  CURLcode result = Curl_urldecode(inputbuff, 0, &newp, &len,
                                    REJECT_NADA);
   if(!newp || result)
     return NULL;
@@ -226,7 +226,7 @@ static CURLcode dict_do(struct Curl_easy *data, bool *done)
       strategy = (char *)".";
     }
 
-    eword = unescape_word(data, word);
+    eword = unescape_word(word);
     if(!eword)
       return CURLE_OUT_OF_MEMORY;
 
@@ -274,7 +274,7 @@ static CURLcode dict_do(struct Curl_easy *data, bool *done)
       database = (char *)"!";
     }
 
-    eword = unescape_word(data, word);
+    eword = unescape_word(word);
     if(!eword)
       return CURLE_OUT_OF_MEMORY;
 
diff --git a/lib/easy.c b/lib/easy.c
index a225191d6..0e2356137 100644
--- a/lib/easy.c
+++ b/lib/easy.c
@@ -68,7 +68,6 @@
 #include "slist.h"
 #include "mime.h"
 #include "amigaos.h"
-#include "non-ascii.h"
 #include "warnless.h"
 #include "multiif.h"
 #include "sigpipe.h"
@@ -927,8 +926,6 @@ struct Curl_easy *curl_easy_duphandle(struct Curl_easy *data)
   }
 #endif /* USE_ARES */
 
-  Curl_convert_setup(outcurl);
-
   Curl_initinfo(outcurl);
 
   outcurl->magic = CURLEASY_MAGIC_NUMBER;
diff --git a/lib/escape.c b/lib/escape.c
index 53361fb08..ff5887508 100644
--- a/lib/escape.c
+++ b/lib/escape.c
@@ -29,7 +29,6 @@
 
 #include "urldata.h"
 #include "warnless.h"
-#include "non-ascii.h"
 #include "escape.h"
 #include "strdup.h"
 /* The last 3 #include files should be in this order */
@@ -80,8 +79,8 @@ char *curl_easy_escape(struct Curl_easy *data, const char *string,
                        int inlength)
 {
   size_t length;
-  CURLcode result;
   struct dynbuf d;
+  (void)data;
 
   if(inlength < 0)
     return NULL;
@@ -102,16 +101,7 @@ char *curl_easy_escape(struct Curl_easy *data, const char *string,
     }
     else {
       /* encode it */
-      char encoded[4];
-      result = Curl_convert_to_network(data, (char *)&in, 1);
-      if(result) {
-        /* Curl_convert_to_network calls failf if unsuccessful */
-        Curl_dyn_free(&d);
-        return NULL;
-      }
-
-      msnprintf(encoded, sizeof(encoded), "%%%02X", in);
-      if(Curl_dyn_add(&d, encoded))
+      if(Curl_dyn_addf(&d, "%%%02X", in))
         return NULL;
     }
     string++;
@@ -126,8 +116,7 @@ char *curl_easy_escape(struct Curl_easy *data, const char *string,
  * Returns a pointer to a malloced string in *ostring with length given in
  * *olen. If length == 0, the length is assumed to be strlen(string).
  *
- * 'data' can be set to NULL but then this function can't convert network
- * data to host for non-ascii.
+ * 'data' can be set to NULL
  *
  * ctrl options:
  * - REJECT_NADA: accept everything
@@ -139,8 +128,7 @@ char *curl_easy_escape(struct Curl_easy *data, const char *string,
  * invokes that used TRUE/FALSE (0 and 1).
  */
 
-CURLcode Curl_urldecode(struct Curl_easy *data,
-                        const char *string, size_t length,
+CURLcode Curl_urldecode(const char *string, size_t length,
                         char **ostring, size_t *olen,
                         enum urlreject ctrl)
 {
@@ -148,7 +136,6 @@ CURLcode Curl_urldecode(struct Curl_easy *data,
   char *ns;
   size_t strindex = 0;
   unsigned long hex;
-  CURLcode result = CURLE_OK;
 
   DEBUGASSERT(string);
   DEBUGASSERT(ctrl >= REJECT_NADA); /* crash on TRUE/FALSE */
@@ -174,15 +161,6 @@ CURLcode Curl_urldecode(struct Curl_easy *data,
 
       in = curlx_ultouc(hex); /* this long is never bigger than 255 anyway */
 
-      if(data) {
-        result = Curl_convert_from_network(data, (char *)&in, 1);
-        if(result) {
-          /* Curl_convert_from_network calls failf if unsuccessful */
-          free(ns);
-          return result;
-        }
-      }
-
       string += 2;
       alloc -= 2;
     }
@@ -218,10 +196,11 @@ char *curl_easy_unescape(struct Curl_easy *data, const char *string,
                          int length, int *olen)
 {
   char *str = NULL;
+  (void)data;
   if(length >= 0) {
     size_t inputlen = length;
     size_t outputlen;
-    CURLcode res = Curl_urldecode(data, string, inputlen, &str, &outputlen,
+    CURLcode res = Curl_urldecode(string, inputlen, &str, &outputlen,
                                   REJECT_NADA);
     if(res)
       return NULL;
diff --git a/lib/escape.h b/lib/escape.h
index 46cb59039..02668835c 100644
--- a/lib/escape.h
+++ b/lib/escape.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -32,8 +32,7 @@ enum urlreject {
   REJECT_ZERO
 };
 
-CURLcode Curl_urldecode(struct Curl_easy *data,
-                        const char *string, size_t length,
+CURLcode Curl_urldecode(const char *string, size_t length,
                         char **ostring, size_t *olen,
                         enum urlreject ctrl);
 
diff --git a/lib/file.c b/lib/file.c
index 0420db345..3da79a2c1 100644
--- a/lib/file.c
+++ b/lib/file.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -147,7 +147,7 @@ static CURLcode file_connect(struct Curl_easy *data, bool *done)
 #endif
   size_t real_path_len;
 
-  CURLcode result = Curl_urldecode(data, data->state.up.path, 0, &real_path,
+  CURLcode result = Curl_urldecode(data->state.up.path, 0, &real_path,
                                    &real_path_len, REJECT_ZERO);
   if(result)
     return result;
diff --git a/lib/formdata.c b/lib/formdata.c
index ce11d5b48..5fefd7a6e 100644
--- a/lib/formdata.c
+++ b/lib/formdata.c
@@ -33,7 +33,6 @@
 
 #include "urldata.h" /* for struct Curl_easy */
 #include "mime.h"
-#include "non-ascii.h"
 #include "vtls/vtls.h"
 #include "strcase.h"
 #include "sendf.h"
@@ -274,14 +273,8 @@ CURLFORMcode FormAdd(struct curl_httppost **httppost,
        * Set the Name property.
        */
     case CURLFORM_PTRNAME:
-#ifdef CURL_DOES_CONVERSIONS
-      /* Treat CURLFORM_PTR like CURLFORM_COPYNAME so that libcurl will copy
-       * the data in all cases so that we'll have safe memory for the eventual
-       * conversion.
-       */
-#else
       current_form->flags |= HTTPPOST_PTRNAME; /* fall through */
-#endif
+
       /* FALLTHROUGH */
     case CURLFORM_COPYNAME:
       if(current_form->name)
@@ -906,11 +899,6 @@ CURLcode Curl_getformdata(struct Curl_easy *data,
           else
             uclen = (size_t)clen;
           result = curl_mime_data(part, post->contents, uclen);
-#ifdef CURL_DOES_CONVERSIONS
-          /* Convert textual contents now. */
-          if(!result && data && part->datasize)
-            result = Curl_convert_to_network(data, part->data, part->datasize);
-#endif
         }
       }
 
diff --git a/lib/ftp.c b/lib/ftp.c
index f6921e426..548796113 100644
--- a/lib/ftp.c
+++ b/lib/ftp.c
@@ -76,7 +76,6 @@
 #include "speedcheck.h"
 #include "warnless.h"
 #include "http_proxy.h"
-#include "non-ascii.h"
 #include "socks.h"
 /* The last 3 #include files should be in this order */
 #include "curl_printf.h"
@@ -1460,7 +1459,7 @@ static CURLcode ftp_state_list(struct Curl_easy *data)
     /* url-decode before evaluation: e.g. paths starting/ending with %2f */
     const char *slashPos = NULL;
     char *rawPath = NULL;
-    result = Curl_urldecode(data, ftp->path, 0, &rawPath, NULL, REJECT_CTRL);
+    result = Curl_urldecode(ftp->path, 0, &rawPath, NULL, REJECT_CTRL);
     if(result)
       return result;
 
@@ -3247,7 +3246,7 @@ static CURLcode ftp_done(struct Curl_easy *data, CURLcode status,
 
   if(!result)
     /* get the url-decoded "raw" path */
-    result = Curl_urldecode(data, ftp->path, 0, &rawPath, &pathLen,
+    result = Curl_urldecode(ftp->path, 0, &rawPath, &pathLen,
                             REJECT_CTRL);
   if(result) {
     /* We can limp along anyway (and should try to since we may already be in
@@ -4131,7 +4130,7 @@ CURLcode ftp_parse_url_path(struct Curl_easy *data)
   ftpc->cwdfail = FALSE;
 
   /* url-decode ftp path before further evaluation */
-  result = Curl_urldecode(data, ftp->path, 0, &rawPath, &pathLen, REJECT_CTRL);
+  result = Curl_urldecode(ftp->path, 0, &rawPath, &pathLen, REJECT_CTRL);
   if(result)
     return result;
 
diff --git a/lib/gopher.c b/lib/gopher.c
index f61232ff5..0a3ba8fb5 100644
--- a/lib/gopher.c
+++ b/lib/gopher.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -165,7 +165,7 @@ static CURLcode gopher_do(struct Curl_easy *data, bool *done)
     newp += 2;
 
     /* ... and finally unescape */
-    result = Curl_urldecode(data, newp, 0, &sel, &len, REJECT_ZERO);
+    result = Curl_urldecode(newp, 0, &sel, &len, REJECT_ZERO);
     free(gopherpath);
     if(result)
       return result;
diff --git a/lib/http.c b/lib/http.c
index c036d877e..d9043bcad 100644
--- a/lib/http.c
+++ b/lib/http.c
@@ -77,7 +77,6 @@
 #include "content_encoding.h"
 #include "http_proxy.h"
 #include "warnless.h"
-#include "non-ascii.h"
 #include "http2.h"
 #include "connect.h"
 #include "strdup.h"
@@ -327,7 +326,7 @@ static CURLcode http_output_basic(struct Curl_easy *data, bool proxy)
   if(!out)
     return CURLE_OUT_OF_MEMORY;
 
-  result = Curl_base64_encode(data, out, strlen(out), &authorization, &size);
+  result = Curl_base64_encode(out, strlen(out), &authorization, &size);
   if(result)
     goto fail;
 
@@ -1251,14 +1250,6 @@ CURLcode Curl_buffer_send(struct dynbuf *in,
 
   DEBUGASSERT(size > (size_t)included_body_bytes);
 
-  result = Curl_convert_to_network(data, ptr, headersize);
-  /* Curl_convert_to_network calls failf if unsuccessful */
-  if(result) {
-    /* conversion failed, free memory and return to the caller */
-    Curl_dyn_free(in);
-    return result;
-  }
-
   if((conn->handler->flags & PROTOPT_SSL
 #ifndef CURL_DISABLE_PROXY
       || conn->http_proxy.proxytype == CURLPROXY_HTTPS
@@ -3308,20 +3299,6 @@ checkhttpprefix(struct Curl_easy *data,
   struct curl_slist *head = data->set.http200aliases;
   statusline rc = STATUS_BAD;
   statusline onmatch = len >= 5? STATUS_DONE : STATUS_UNKNOWN;
-#ifdef CURL_DOES_CONVERSIONS
-  /* convert from the network encoding using a scratch area */
-  char *scratch = strdup(s);
-  if(!scratch) {
-    failf(data, "Failed to allocate memory for conversion!");
-    return FALSE; /* can't return CURLE_OUT_OF_MEMORY so return FALSE */
-  }
-  if(CURLE_OK != Curl_convert_from_network(data, scratch, strlen(s) + 1)) {
-    /* Curl_convert_from_network calls failf if unsuccessful */
-    free(scratch);
-    return FALSE; /* can't return CURLE_foobar so return FALSE */
-  }
-  s = scratch;
-#endif /* CURL_DOES_CONVERSIONS */
 
   while(head) {
     if(checkprefixmax(head->data, s, len)) {
@@ -3334,9 +3311,6 @@ checkhttpprefix(struct Curl_easy *data,
   if((rc != STATUS_DONE) && (checkprefixmax("HTTP/", s, len)))
     rc = onmatch;
 
-#ifdef CURL_DOES_CONVERSIONS
-  free(scratch);
-#endif /* CURL_DOES_CONVERSIONS */
   return rc;
 }
 
@@ -3347,26 +3321,9 @@ checkrtspprefix(struct Curl_easy *data,
 {
   statusline result = STATUS_BAD;
   statusline onmatch = len >= 5? STATUS_DONE : STATUS_UNKNOWN;
-
-#ifdef CURL_DOES_CONVERSIONS
-  /* convert from the network encoding using a scratch area */
-  char *scratch = strdup(s);
-  if(!scratch) {
-    failf(data, "Failed to allocate memory for conversion!");
-    return FALSE; /* can't return CURLE_OUT_OF_MEMORY so return FALSE */
-  }
-  if(CURLE_OK != Curl_convert_from_network(data, scratch, strlen(s) + 1)) {
-    /* Curl_convert_from_network calls failf if unsuccessful */
-    result = FALSE; /* can't return CURLE_foobar so return FALSE */
-  }
-  else if(checkprefixmax("RTSP/", scratch, len))
-    result = onmatch;
-  free(scratch);
-#else
   (void)data; /* unused */
   if(checkprefixmax("RTSP/", s, len))
     result = onmatch;
-#endif /* CURL_DOES_CONVERSIONS */
 
   return result;
 }
@@ -3903,21 +3860,10 @@ CURLcode Curl_http_readwrite_headers(struct Curl_easy *data,
       size_t headerlen;
       /* Zero-length header line means end of headers! */
 
-#ifdef CURL_DOES_CONVERSIONS
-      if(0x0d == *headp) {
-        *headp = '\r'; /* replace with CR in host encoding */
-        headp++;       /* pass the CR byte */
-      }
-      if(0x0a == *headp) {
-        *headp = '\n'; /* replace with LF in host encoding */
-        headp++;       /* pass the LF byte */
-      }
-#else
       if('\r' == *headp)
         headp++; /* pass the \r byte */
       if('\n' == *headp)
         headp++; /* pass the \n byte */
-#endif /* CURL_DOES_CONVERSIONS */
 
       if(100 <= k->httpcode && 199 >= k->httpcode) {
         /* "A user agent MAY ignore unexpected 1xx status responses." */
@@ -4189,26 +4135,7 @@ CURLcode Curl_http_readwrite_headers(struct Curl_easy *data,
       int httpversion_major;
       int rtspversion_major;
       int nc = 0;
-#ifdef CURL_DOES_CONVERSIONS
-#define HEADER1 scratch
-#define SCRATCHSIZE 21
-      CURLcode res;
-      char scratch[SCRATCHSIZE + 1]; /* "HTTP/major.minor 123" */
-      /* We can't really convert this yet because we don't know if it's the
-         1st header line or the body.  So we do a partial conversion into a
-         scratch area, leaving the data at 'headp' as-is.
-      */
-      strncpy(&scratch[0], headp, SCRATCHSIZE);
-      scratch[SCRATCHSIZE] = 0; /* null terminate */
-      res = Curl_convert_from_network(data,
-                                      &scratch[0],
-                                      SCRATCHSIZE);
-      if(res)
-        /* Curl_convert_from_network calls failf if unsuccessful */
-        return res;
-#else
 #define HEADER1 headp /* no conversion needed, just use headp */
-#endif /* CURL_DOES_CONVERSIONS */
 
       if(conn->handler->protocol & PROTO_FAMILY_HTTP) {
         /*
@@ -4333,11 +4260,6 @@ CURLcode Curl_http_readwrite_headers(struct Curl_easy *data,
       }
     }
 
-    result = Curl_convert_from_network(data, headp, strlen(headp));
-    /* Curl_convert_from_network calls failf if unsuccessful */
-    if(result)
-      return result;
-
     result = Curl_http_header(data, conn, headp);
     if(result)
       return result;
diff --git a/lib/http2.c b/lib/http2.c
index e74400a4c..652be3f8a 100644
--- a/lib/http2.c
+++ b/lib/http2.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -1337,7 +1337,7 @@ CURLcode Curl_http2_request_upgrade(struct dynbuf *req,
   }
   conn->proto.httpc.binlen = binlen;
 
-  result = Curl_base64url_encode(data, (const char *)binsettings, binlen,
+  result = Curl_base64url_encode((const char *)binsettings, binlen,
                                  &base64, &blen);
   if(result) {
     Curl_dyn_free(req);
diff --git a/lib/http_chunks.c b/lib/http_chunks.c
index beb969588..72d6f385b 100644
--- a/lib/http_chunks.c
+++ b/lib/http_chunks.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -29,7 +29,6 @@
 #include "dynbuf.h"
 #include "content_encoding.h"
 #include "http.h"
-#include "non-ascii.h" /* for Curl_convert_to_network prototype */
 #include "strtoofft.h"
 #include "warnless.h"
 
@@ -74,18 +73,7 @@
 
  */
 
-#ifdef CURL_DOES_CONVERSIONS
-/* Check for an ASCII hex digit.
-   We avoid the use of ISXDIGIT to accommodate non-ASCII hosts. */
-static bool isxdigit_ascii(char digit)
-{
-  return (digit >= 0x30 && digit <= 0x39) /* 0-9 */
-    || (digit >= 0x41 && digit <= 0x46) /* A-F */
-    || (digit >= 0x61 && digit <= 0x66); /* a-f */
-}
-#else
 #define isxdigit_ascii(x) Curl_isxdigit(x)
-#endif
 
 void Curl_httpchunk_init(struct Curl_easy *data)
 {
@@ -157,14 +145,6 @@ CHUNKcode Curl_httpchunk_read(struct Curl_easy *data,
         /* length and datap are unmodified */
         ch->hexbuffer[ch->hexindex] = 0;
 
-        /* convert to host encoding before calling strtoul */
-        result = Curl_convert_from_network(data, ch->hexbuffer, ch->hexindex);
-        if(result) {
-          /* Curl_convert_from_network calls failf if unsuccessful */
-          /* Treat it as a bad hex character */
-          return CHUNKE_ILLEGAL_HEX;
-        }
-
         if(curlx_strtoofft(ch->hexbuffer, &endptr, 16, &ch->datasize))
           return CHUNKE_ILLEGAL_HEX;
         ch->state = CHUNK_LF; /* now wait for the CRLF */
@@ -240,13 +220,6 @@ CHUNKcode Curl_httpchunk_read(struct Curl_easy *data,
 
           tr = Curl_dyn_ptr(&conn->trailer);
           trlen = Curl_dyn_len(&conn->trailer);
-          /* Convert to host encoding before calling Curl_client_write */
-          result = Curl_convert_from_network(data, tr, trlen);
-          if(result)
-            /* Curl_convert_from_network calls failf if unsuccessful */
-            /* Treat it as a bad chunk */
-            return CHUNKE_BAD_CHUNK;
-
           if(!data->set.http_te_skip) {
             result = Curl_client_write(data, CLIENTWRITE_HEADER, tr, trlen);
             if(result) {
diff --git a/lib/http_negotiate.c b/lib/http_negotiate.c
index 5f764dc13..888d3b24a 100644
--- a/lib/http_negotiate.c
+++ b/lib/http_negotiate.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -161,7 +161,7 @@ CURLcode Curl_output_negotiate(struct Curl_easy *data,
         return result;
     }
 
-    result = Curl_auth_create_spnego_message(data, neg_ctx, &base64, &len);
+    result = Curl_auth_create_spnego_message(neg_ctx, &base64, &len);
     if(result)
       return result;
 
diff --git a/lib/http_ntlm.c b/lib/http_ntlm.c
index a6526db9f..bb7e5360f 100644
--- a/lib/http_ntlm.c
+++ b/lib/http_ntlm.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -213,8 +213,7 @@ CURLcode Curl_output_ntlm(struct Curl_easy *data, bool proxy)
                                                  ntlm, &ntlmmsg);
     if(!result) {
       DEBUGASSERT(Curl_bufref_len(&ntlmmsg) != 0);
-      result = Curl_base64_encode(data,
-                                  (const char *) Curl_bufref_ptr(&ntlmmsg),
+      result = Curl_base64_encode((const char *) Curl_bufref_ptr(&ntlmmsg),
                                   Curl_bufref_len(&ntlmmsg), &base64, &len);
       if(!result) {
         free(*allocuserpwd);
@@ -233,8 +232,7 @@ CURLcode Curl_output_ntlm(struct Curl_easy *data, bool proxy)
     result = Curl_auth_create_ntlm_type3_message(data, userp, passwdp,
                                                  ntlm, &ntlmmsg);
     if(!result && Curl_bufref_len(&ntlmmsg)) {
-      result = Curl_base64_encode(data,
-                                  (const char *) Curl_bufref_ptr(&ntlmmsg),
+      result = Curl_base64_encode((const char *) Curl_bufref_ptr(&ntlmmsg),
                                   Curl_bufref_len(&ntlmmsg), &base64, &len);
       if(!result) {
         free(*allocuserpwd);
diff --git a/lib/http_proxy.c b/lib/http_proxy.c
index e13f485a7..2793459cd 100644
--- a/lib/http_proxy.c
+++ b/lib/http_proxy.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -35,7 +35,6 @@
 #include "url.h"
 #include "select.h"
 #include "progress.h"
-#include "non-ascii.h"
 #include "connect.h"
 #include "curlx.h"
 #include "vtls/vtls.h"
@@ -481,12 +480,6 @@ static CURLcode CONNECT(struct Curl_easy *data,
         linep = Curl_dyn_ptr(&s->rcvbuf);
         perline = Curl_dyn_len(&s->rcvbuf); /* amount of bytes in this line */
 
-        /* convert from the network encoding */
-        result = Curl_convert_from_network(data, linep, perline);
-        /* Curl_convert_from_network calls failf if unsuccessful */
-        if(result)
-          return result;
-
         /* output debug if that is requested */
         Curl_debug(data, CURLINFO_HEADER_IN, linep, perline);
 
diff --git a/lib/imap.c b/lib/imap.c
index 958ad1456..70e4b8306 100644
--- a/lib/imap.c
+++ b/lib/imap.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -1986,7 +1986,7 @@ static CURLcode imap_parse_url_path(struct Curl_easy *data)
     if(end > begin && end[-1] == '/')
       end--;
 
-    result = Curl_urldecode(data, begin, end - begin, &imap->mailbox, NULL,
+    result = Curl_urldecode(begin, end - begin, &imap->mailbox, NULL,
                             REJECT_CTRL);
     if(result)
       return result;
@@ -2009,7 +2009,7 @@ static CURLcode imap_parse_url_path(struct Curl_easy *data)
       return CURLE_URL_MALFORMAT;
 
     /* Decode the name parameter */
-    result = Curl_urldecode(data, begin, ptr - begin, &name, NULL,
+    result = Curl_urldecode(begin, ptr - begin, &name, NULL,
                             REJECT_CTRL);
     if(result)
       return result;
@@ -2020,7 +2020,7 @@ static CURLcode imap_parse_url_path(struct Curl_easy *data)
       ptr++;
 
     /* Decode the value parameter */
-    result = Curl_urldecode(data, begin, ptr - begin, &value, &valuelen,
+    result = Curl_urldecode(begin, ptr - begin, &value, &valuelen,
                             REJECT_CTRL);
     if(result) {
       free(name);
@@ -2108,7 +2108,7 @@ static CURLcode imap_parse_custom_request(struct Curl_easy *data)
 
   if(custom) {
     /* URL decode the custom request */
-    result = Curl_urldecode(data, custom, 0, &imap->custom, NULL, REJECT_CTRL);
+    result = Curl_urldecode(custom, 0, &imap->custom, NULL, REJECT_CTRL);
 
     /* Extract the parameters if specified */
     if(!result) {
diff --git a/lib/krb5.c b/lib/krb5.c
index 5edd34cbd..787137c19 100644
--- a/lib/krb5.c
+++ b/lib/krb5.c
@@ -2,7 +2,7 @@
  *
  * Copyright (c) 1995, 1996, 1997, 1998, 1999 Kungliga Tekniska Högskolan
  * (Royal Institute of Technology, Stockholm, Sweden).
- * Copyright (c) 2004 - 2021 Daniel Stenberg
+ * Copyright (c) 2004 - 2022 Daniel Stenberg
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -47,7 +47,6 @@
 #include "sendf.h"
 #include "curl_krb5.h"
 #include "warnless.h"
-#include "non-ascii.h"
 #include "strcase.h"
 #include "strdup.h"
 
@@ -81,11 +80,6 @@ static CURLcode ftpsend(struct Curl_easy *data, struct connectdata *conn,
   write_len += 2;
   bytes_written = 0;
 
-  result = Curl_convert_to_network(data, s, write_len);
-  /* Curl_convert_to_network calls failf if unsuccessful */
-  if(result)
-    return result;
-
   for(;;) {
 #ifdef HAVE_GSSAPI
     conn->data_prot = PROT_CMD;
@@ -298,7 +292,7 @@ krb5_auth(void *app_data, struct Curl_easy *data, struct connectdata *conn)
       if(output_buffer.length) {
         char *cmd;
 
-        result = Curl_base64_encode(data, (char *)output_buffer.value,
+        result = Curl_base64_encode((char *)output_buffer.value,
                                     output_buffer.length, &p, &base64_sz);
         if(result) {
           infof(data, "base64-encoding: %s", curl_easy_strerror(result));
@@ -612,7 +606,7 @@ static void do_sec_send(struct Curl_easy *data, struct connectdata *conn,
     return; /* error */
 
   if(iscmd) {
-    error = Curl_base64_encode(data, buffer, curlx_sitouz(bytes),
+    error = Curl_base64_encode(buffer, curlx_sitouz(bytes),
                                &cmd_buffer, &cmd_size);
     if(error) {
       free(buffer);
diff --git a/lib/ldap.c b/lib/ldap.c
index 3e3562078..0b3ee373b 100644
--- a/lib/ldap.c
+++ b/lib/ldap.c
@@ -636,11 +636,8 @@ static CURLcode ldap_do(struct Curl_easy *data, bool *done)
           if((attr_len > 7) &&
              (strcmp(";binary", (char *) attr + (attr_len - 7)) == 0)) {
             /* Binary attribute, encode to base64. */
-            result = Curl_base64_encode(data,
-                                        vals[i]->bv_val,
-                                        vals[i]->bv_len,
-                                        &val_b64,
-                                        &val_b64_sz);
+            result = Curl_base64_encode(vals[i]->bv_val, vals[i]->bv_len,
+                                        &val_b64, &val_b64_sz);
             if(result) {
               ldap_value_free_len(vals);
               FREE_ON_WINLDAP(attr);
@@ -870,7 +867,7 @@ static int _ldap_url_parse2(struct Curl_easy *data,
     LDAP_TRACE(("DN '%s'\n", dn));
 
     /* Unescape the DN */
-    result = Curl_urldecode(data, dn, 0, &unescaped, NULL, REJECT_ZERO);
+    result = Curl_urldecode(dn, 0, &unescaped, NULL, REJECT_ZERO);
     if(result) {
       rc = LDAP_NO_MEMORY;
 
@@ -935,7 +932,7 @@ static int _ldap_url_parse2(struct Curl_easy *data,
       LDAP_TRACE(("attr[%zu] '%s'\n", i, attributes[i]));
 
       /* Unescape the attribute */
-      result = Curl_urldecode(data, attributes[i], 0, &unescaped, NULL,
+      result = Curl_urldecode(attributes[i], 0, &unescaped, NULL,
                               REJECT_ZERO);
       if(result) {
         free(attributes);
@@ -1005,7 +1002,7 @@ static int _ldap_url_parse2(struct Curl_easy *data,
     LDAP_TRACE(("filter '%s'\n", filter));
 
     /* Unescape the filter */
-    result = Curl_urldecode(data, filter, 0, &unescaped, NULL, REJECT_ZERO);
+    result = Curl_urldecode(filter, 0, &unescaped, NULL, REJECT_ZERO);
     if(result) {
       rc = LDAP_NO_MEMORY;
 
diff --git a/lib/mime.c b/lib/mime.c
index 7783b8990..3cf420b84 100644
--- a/lib/mime.c
+++ b/lib/mime.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -25,7 +25,6 @@
 #include <curl/curl.h>
 
 #include "mime.h"
-#include "non-ascii.h"
 #include "warnless.h"
 #include "urldata.h"
 #include "sendf.h"
@@ -506,15 +505,6 @@ static size_t encoder_base64_read(char *buffer, size_t size, bool ateof,
     }
   }
 
-#ifdef CURL_DOES_CONVERSIONS
-  /* This is now textual data, Convert character codes. */
-  if(part->easy && cursize) {
-    CURLcode result = Curl_convert_to_network(part->easy, buffer, cursize);
-    if(result)
-      return READ_ERROR;
-  }
-#endif
-
   return cursize;
 }
 
@@ -925,9 +915,6 @@ static size_t readback_part(curl_mimepart *part,
                             char *buffer, size_t bufsize, bool *hasread)
 {
   size_t cursize = 0;
-#ifdef CURL_DOES_CONVERSIONS
-  char *convbuf = buffer;
-#endif
 
   /* Readback from part. */
 
@@ -967,15 +954,6 @@ static size_t readback_part(curl_mimepart *part,
         mimesetstate(&part->state, MIMESTATE_BODY, NULL);
       break;
     case MIMESTATE_BODY:
-#ifdef CURL_DOES_CONVERSIONS
-      if(part->easy && convbuf < buffer) {
-        CURLcode result = Curl_convert_to_network(part->easy, convbuf,
-                                                  buffer - convbuf);
-        if(result)
-          return READ_ERROR;
-        convbuf = buffer;
-      }
-#endif
       cleanup_encoder_state(&part->encstate);
       mimesetstate(&part->state, MIMESTATE_CONTENT, NULL);
       break;
@@ -1012,16 +990,6 @@ static size_t readback_part(curl_mimepart *part,
     bufsize -= sz;
   }
 
-#ifdef CURL_DOES_CONVERSIONS
-      if(part->easy && convbuf < buffer &&
-         part->state.state < MIMESTATE_BODY) {
-        CURLcode result = Curl_convert_to_network(part->easy, convbuf,
-                                                  buffer - convbuf);
-        if(result)
-          return READ_ERROR;
-      }
-#endif
-
   return cursize;
 }
 
@@ -1031,10 +999,6 @@ static size_t mime_subparts_read(char *buffer, size_t size, size_t nitems,
 {
   curl_mime *mime = (curl_mime *) instream;
   size_t cursize = 0;
-#ifdef CURL_DOES_CONVERSIONS
-  char *convbuf = buffer;
-#endif
-
   (void) size;   /* Always 1. */
 
   while(nitems) {
@@ -1043,9 +1007,6 @@ static size_t mime_subparts_read(char *buffer, size_t size, size_t nitems,
     switch(mime->state.state) {
     case MIMESTATE_BEGIN:
     case MIMESTATE_BODY:
-#ifdef CURL_DOES_CONVERSIONS
-      convbuf = buffer;
-#endif
       mimesetstate(&mime->state, MIMESTATE_BOUNDARY1, mime->firstpart);
       /* The first boundary always follows the header termination empty line,
          so is always preceded by a CRLF. We can then spare 2 characters
@@ -1061,15 +1022,6 @@ static size_t mime_subparts_read(char *buffer, size_t size, size_t nitems,
       sz = readback_bytes(&mime->state, buffer, nitems, mime->boundary,
                           strlen(mime->boundary), part? "\r\n": "--\r\n");
       if(!sz) {
-#ifdef CURL_DOES_CONVERSIONS
-        if(mime->easy && convbuf < buffer) {
-          CURLcode result = Curl_convert_to_network(mime->easy, convbuf,
-                                                    buffer - convbuf);
-          if(result)
-            return READ_ERROR;
-          convbuf = buffer;
-        }
-#endif
         mimesetstate(&mime->state, MIMESTATE_CONTENT, part);
       }
       break;
@@ -1086,9 +1038,6 @@ static size_t mime_subparts_read(char *buffer, size_t size, size_t nitems,
       case STOP_FILLING:
         return cursize? cursize: sz;
       case 0:
-#ifdef CURL_DOES_CONVERSIONS
-        convbuf = buffer;
-#endif
         mimesetstate(&mime->state, MIMESTATE_BOUNDARY1, part->nextpart);
         break;
       }
@@ -1105,16 +1054,6 @@ static size_t mime_subparts_read(char *buffer, size_t size, size_t nitems,
     nitems -= sz;
   }
 
-#ifdef CURL_DOES_CONVERSIONS
-      if(mime->easy && convbuf < buffer &&
-         mime->state.state <= MIMESTATE_CONTENT) {
-        CURLcode result = Curl_convert_to_network(mime->easy, convbuf,
-                                                  buffer - convbuf);
-        if(result)
-          return READ_ERROR;
-      }
-#endif
-
   return cursize;
 }
 
diff --git a/lib/mqtt.c b/lib/mqtt.c
index c056ae77b..e0fa0aa8f 100644
--- a/lib/mqtt.c
+++ b/lib/mqtt.c
@@ -386,8 +386,7 @@ static CURLcode mqtt_get_topic(struct Curl_easy *data,
 {
   char *path = data->state.up.path;
   if(strlen(path) > 1)
-    return Curl_urldecode(data, path + 1, 0, topic, topiclen,
-                          REJECT_NADA);
+    return Curl_urldecode(path + 1, 0, topic, topiclen, REJECT_NADA);
   failf(data, "No MQTT topic found. Forgot to URL encode it?");
   return CURLE_URL_MALFORMAT;
 }
diff --git a/lib/non-ascii.c b/lib/non-ascii.c
deleted file mode 100644
index 3b77ae98d..000000000
--- a/lib/non-ascii.c
+++ /dev/null
@@ -1,336 +0,0 @@
-/***************************************************************************
- *                                  _   _ ____  _
- *  Project                     ___| | | |  _ \| |
- *                             / __| | | | |_) | |
- *                            | (__| |_| |  _ <| |___
- *                             \___|\___/|_| \_\_____|
- *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
- *
- * This software is licensed as described in the file COPYING, which
- * you should have received as part of this distribution. The terms
- * are also available at https://curl.se/docs/copyright.html.
- *
- * You may opt to use, copy, modify, merge, publish, distribute and/or sell
- * copies of the Software, and permit persons to whom the Software is
- * furnished to do so, under the terms of the COPYING file.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- ***************************************************************************/
-
-#include "curl_setup.h"
-
-#ifdef CURL_DOES_CONVERSIONS
-
-#include <curl/curl.h>
-
-#include "non-ascii.h"
-#include "formdata.h"
-#include "sendf.h"
-#include "urldata.h"
-#include "multiif.h"
-#include "strerror.h"
-
-#include "curl_memory.h"
-/* The last #include file should be: */
-#include "memdebug.h"
-
-#ifdef HAVE_ICONV
-#include <iconv.h>
-/* set default codesets for iconv */
-#ifndef CURL_ICONV_CODESET_OF_NETWORK
-#define CURL_ICONV_CODESET_OF_NETWORK "ISO8859-1"
-#endif
-#ifndef CURL_ICONV_CODESET_FOR_UTF8
-#define CURL_ICONV_CODESET_FOR_UTF8   "UTF-8"
-#endif
-#define ICONV_ERROR  (size_t)-1
-#endif /* HAVE_ICONV */
-
-/*
- * Curl_convert_clone() returns a malloced copy of the source string (if
- * returning CURLE_OK), with the data converted to network format.
- */
-CURLcode Curl_convert_clone(struct Curl_easy *data,
-                           const char *indata,
-                           size_t insize,
-                           char **outbuf)
-{
-  char *convbuf;
-  CURLcode result;
-
-  convbuf = malloc(insize);
-  if(!convbuf)
-    return CURLE_OUT_OF_MEMORY;
-
-  memcpy(convbuf, indata, insize);
-  result = Curl_convert_to_network(data, convbuf, insize);
-  if(result) {
-    free(convbuf);
-    return result;
-  }
-
-  *outbuf = convbuf; /* return the converted buffer */
-
-  return CURLE_OK;
-}
-
-/*
- * Curl_convert_to_network() is an internal function for performing ASCII
- * conversions on non-ASCII platforms. It converts the buffer _in place_.
- */
-CURLcode Curl_convert_to_network(struct Curl_easy *data,
-                                 char *buffer, size_t length)
-{
-  if(data && data->set.convtonetwork) {
-    /* use translation callback */
-    CURLcode result;
-    Curl_set_in_callback(data, true);
-    result = data->set.convtonetwork(buffer, length);
-    Curl_set_in_callback(data, false);
-    if(result) {
-      failf(data,
-            "CURLOPT_CONV_TO_NETWORK_FUNCTION callback returned %d: %s",
-            (int)result, curl_easy_strerror(result));
-    }
-
-    return result;
-  }
-  else {
-#ifdef HAVE_ICONV
-    /* do the translation ourselves */
-    iconv_t tmpcd = (iconv_t) -1;
-    iconv_t *cd = &tmpcd;
-    char *input_ptr, *output_ptr;
-    size_t in_bytes, out_bytes, rc;
-    char ebuffer[STRERROR_LEN];
-
-    /* open an iconv conversion descriptor if necessary */
-    if(data)
-      cd = &data->outbound_cd;
-    if(*cd == (iconv_t)-1) {
-      *cd = iconv_open(CURL_ICONV_CODESET_OF_NETWORK,
-                       CURL_ICONV_CODESET_OF_HOST);
-      if(*cd == (iconv_t)-1) {
-        failf(data,
-              "The iconv_open(\"%s\", \"%s\") call failed with errno %i: %s",
-              CURL_ICONV_CODESET_OF_NETWORK,
-              CURL_ICONV_CODESET_OF_HOST,
-              errno, Curl_strerror(errno, ebuffer, sizeof(ebuffer)));
-        return CURLE_CONV_FAILED;
-      }
-    }
-    /* call iconv */
-    input_ptr = output_ptr = buffer;
-    in_bytes = out_bytes = length;
-    rc = iconv(*cd, &input_ptr, &in_bytes,
-               &output_ptr, &out_bytes);
-    if(!data)
-      iconv_close(tmpcd);
-    if((rc == ICONV_ERROR) || (in_bytes)) {
-      failf(data,
-            "The Curl_convert_to_network iconv call failed with errno %i: %s",
-            errno, Curl_strerror(errno, ebuffer, sizeof(ebuffer)));
-      return CURLE_CONV_FAILED;
-    }
-#else
-    failf(data, "CURLOPT_CONV_TO_NETWORK_FUNCTION callback required");
-    return CURLE_CONV_REQD;
-#endif /* HAVE_ICONV */
-  }
-
-  return CURLE_OK;
-}
-
-/*
- * Curl_convert_from_network() is an internal function for performing ASCII
- * conversions on non-ASCII platforms. It converts the buffer _in place_.
- */
-CURLcode Curl_convert_from_network(struct Curl_easy *data,
-                                   char *buffer, size_t length)
-{
-  if(data && data->set.convfromnetwork) {
-    /* use translation callback */
-    CURLcode result;
-    Curl_set_in_callback(data, true);
-    result = data->set.convfromnetwork(buffer, length);
-    Curl_set_in_callback(data, false);
-    if(result) {
-      failf(data,
-            "CURLOPT_CONV_FROM_NETWORK_FUNCTION callback returned %d: %s",
-            (int)result, curl_easy_strerror(result));
-    }
-
-    return result;
-  }
-  else {
-#ifdef HAVE_ICONV
-    /* do the translation ourselves */
-    iconv_t tmpcd = (iconv_t) -1;
-    iconv_t *cd = &tmpcd;
-    char *input_ptr, *output_ptr;
-    size_t in_bytes, out_bytes, rc;
-    char ebuffer[STRERROR_LEN];
-
-    /* open an iconv conversion descriptor if necessary */
-    if(data)
-      cd = &data->inbound_cd;
-    if(*cd == (iconv_t)-1) {
-      *cd = iconv_open(CURL_ICONV_CODESET_OF_HOST,
-                       CURL_ICONV_CODESET_OF_NETWORK);
-      if(*cd == (iconv_t)-1) {
-        failf(data,
-              "The iconv_open(\"%s\", \"%s\") call failed with errno %i: %s",
-              CURL_ICONV_CODESET_OF_HOST,
-              CURL_ICONV_CODESET_OF_NETWORK,
-              errno, Curl_strerror(errno, ebuffer, sizeof(ebuffer)));
-        return CURLE_CONV_FAILED;
-      }
-    }
-    /* call iconv */
-    input_ptr = output_ptr = buffer;
-    in_bytes = out_bytes = length;
-    rc = iconv(*cd, &input_ptr, &in_bytes,
-               &output_ptr, &out_bytes);
-    if(!data)
-      iconv_close(tmpcd);
-    if((rc == ICONV_ERROR) || (in_bytes)) {
-      failf(data,
-            "Curl_convert_from_network iconv call failed with errno %i: %s",
-            errno, Curl_strerror(errno, ebuffer, sizeof(ebuffer)));
-      return CURLE_CONV_FAILED;
-    }
-#else
-    failf(data, "CURLOPT_CONV_FROM_NETWORK_FUNCTION callback required");
-    return CURLE_CONV_REQD;
-#endif /* HAVE_ICONV */
-  }
-
-  return CURLE_OK;
-}
-
-/*
- * Curl_convert_from_utf8() is an internal function for performing UTF-8
- * conversions on non-ASCII platforms.
- */
-CURLcode Curl_convert_from_utf8(struct Curl_easy *data,
-                                char *buffer, size_t length)
-{
-  if(data && data->set.convfromutf8) {
-    /* use translation callback */
-    CURLcode result;
-    Curl_set_in_callback(data, true);
-    result = data->set.convfromutf8(buffer, length);
-    Curl_set_in_callback(data, false);
-    if(result) {
-      failf(data,
-            "CURLOPT_CONV_FROM_UTF8_FUNCTION callback returned %d: %s",
-            (int)result, curl_easy_strerror(result));
-    }
-
-    return result;
-  }
-  else {
-#ifdef HAVE_ICONV
-    /* do the translation ourselves */
-    iconv_t tmpcd = (iconv_t) -1;
-    iconv_t *cd = &tmpcd;
-    char *input_ptr;
-    char *output_ptr;
-    size_t in_bytes, out_bytes, rc;
-    char ebuffer[STRERROR_LEN];
-
-    /* open an iconv conversion descriptor if necessary */
-    if(data)
-      cd = &data->utf8_cd;
-    if(*cd == (iconv_t)-1) {
-      *cd = iconv_open(CURL_ICONV_CODESET_OF_HOST,
-                       CURL_ICONV_CODESET_FOR_UTF8);
-      if(*cd == (iconv_t)-1) {
-        failf(data,
-              "The iconv_open(\"%s\", \"%s\") call failed with errno %i: %s",
-              CURL_ICONV_CODESET_OF_HOST,
-              CURL_ICONV_CODESET_FOR_UTF8,
-              errno, Curl_strerror(errno, ebuffer, sizeof(ebuffer)));
-        return CURLE_CONV_FAILED;
-      }
-    }
-    /* call iconv */
-    input_ptr = output_ptr = buffer;
-    in_bytes = out_bytes = length;
-    rc = iconv(*cd, &input_ptr, &in_bytes,
-               &output_ptr, &out_bytes);
-    if(!data)
-      iconv_close(tmpcd);
-    if((rc == ICONV_ERROR) || (in_bytes)) {
-      failf(data,
-            "The Curl_convert_from_utf8 iconv call failed with errno %i: %s",
-            errno, Curl_strerror(errno, ebuffer, sizeof(ebuffer)));
-      return CURLE_CONV_FAILED;
-    }
-    if(output_ptr < input_ptr) {
-      /* null terminate the now shorter output string */
-      *output_ptr = 0x00;
-    }
-#else
-    failf(data, "CURLOPT_CONV_FROM_UTF8_FUNCTION callback required");
-    return CURLE_CONV_REQD;
-#endif /* HAVE_ICONV */
-  }
-
-  return CURLE_OK;
-}
-
-/*
- * Init conversion stuff for a Curl_easy
- */
-void Curl_convert_init(struct Curl_easy *data)
-{
-#if defined(CURL_DOES_CONVERSIONS) && defined(HAVE_ICONV)
-  /* conversion descriptors for iconv calls */
-  data->outbound_cd = (iconv_t)-1;
-  data->inbound_cd  = (iconv_t)-1;
-  data->utf8_cd     = (iconv_t)-1;
-#else
-  (void)data;
-#endif /* CURL_DOES_CONVERSIONS && HAVE_ICONV */
-}
-
-/*
- * Setup conversion stuff for a Curl_easy
- */
-void Curl_convert_setup(struct Curl_easy *data)
-{
-  data->inbound_cd = iconv_open(CURL_ICONV_CODESET_OF_HOST,
-                                CURL_ICONV_CODESET_OF_NETWORK);
-  data->outbound_cd = iconv_open(CURL_ICONV_CODESET_OF_NETWORK,
-                                 CURL_ICONV_CODESET_OF_HOST);
-  data->utf8_cd = iconv_open(CURL_ICONV_CODESET_OF_HOST,
-                             CURL_ICONV_CODESET_FOR_UTF8);
-}
-
-/*
- * Close conversion stuff for a Curl_easy
- */
-
-void Curl_convert_close(struct Curl_easy *data)
-{
-#ifdef HAVE_ICONV
-  /* close iconv conversion descriptors */
-  if(data->inbound_cd != (iconv_t)-1) {
-    iconv_close(data->inbound_cd);
-  }
-  if(data->outbound_cd != (iconv_t)-1) {
-    iconv_close(data->outbound_cd);
-  }
-  if(data->utf8_cd != (iconv_t)-1) {
-    iconv_close(data->utf8_cd);
-  }
-#else
-  (void)data;
-#endif /* HAVE_ICONV */
-}
-
-#endif /* CURL_DOES_CONVERSIONS */
diff --git a/lib/non-ascii.h b/lib/non-ascii.h
deleted file mode 100644
index 458e8ef09..000000000
--- a/lib/non-ascii.h
+++ /dev/null
@@ -1,61 +0,0 @@
-#ifndef HEADER_CURL_NON_ASCII_H
-#define HEADER_CURL_NON_ASCII_H
-/***************************************************************************
- *                                  _   _ ____  _
- *  Project                     ___| | | |  _ \| |
- *                             / __| | | | |_) | |
- *                            | (__| |_| |  _ <| |___
- *                             \___|\___/|_| \_\_____|
- *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
- *
- * This software is licensed as described in the file COPYING, which
- * you should have received as part of this distribution. The terms
- * are also available at https://curl.se/docs/copyright.html.
- *
- * You may opt to use, copy, modify, merge, publish, distribute and/or sell
- * copies of the Software, and permit persons to whom the Software is
- * furnished to do so, under the terms of the COPYING file.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- ***************************************************************************/
-#include "curl_setup.h"
-
-#ifdef CURL_DOES_CONVERSIONS
-
-#include "urldata.h"
-
-/*
- * Curl_convert_clone() returns a malloced copy of the source string (if
- * returning CURLE_OK), with the data converted to network format.
- *
- * If no conversion was needed *outbuf may be NULL.
- */
-CURLcode Curl_convert_clone(struct Curl_easy *data,
-                            const char *indata,
-                            size_t insize,
-                            char **outbuf);
-
-void Curl_convert_init(struct Curl_easy *data);
-void Curl_convert_setup(struct Curl_easy *data);
-void Curl_convert_close(struct Curl_easy *data);
-
-CURLcode Curl_convert_to_network(struct Curl_easy *data,
-                                 char *buffer, size_t length);
-CURLcode Curl_convert_from_network(struct Curl_easy *data,
-                                 char *buffer, size_t length);
-CURLcode Curl_convert_from_utf8(struct Curl_easy *data,
-                                 char *buffer, size_t length);
-#else
-#define Curl_convert_clone(a,b,c,d) ((void)a, CURLE_OK)
-#define Curl_convert_init(x) Curl_nop_stmt
-#define Curl_convert_setup(x) Curl_nop_stmt
-#define Curl_convert_close(x) Curl_nop_stmt
-#define Curl_convert_to_network(a,b,c) ((void)a, CURLE_OK)
-#define Curl_convert_from_network(a,b,c) ((void)a, CURLE_OK)
-#define Curl_convert_from_utf8(a,b,c) ((void)a, CURLE_OK)
-#endif
-
-#endif /* HEADER_CURL_NON_ASCII_H */
diff --git a/lib/openldap.c b/lib/openldap.c
index 6ed513f9f..4f0dad835 100644
--- a/lib/openldap.c
+++ b/lib/openldap.c
@@ -1083,7 +1083,7 @@ static ssize_t oldap_recv(struct Curl_easy *data, int sockindex, char *buf,
 
           /* Binary value, encode to base64. */
           if(bvals[i].bv_len)
-            result = Curl_base64_encode(data, bvals[i].bv_val, bvals[i].bv_len,
+            result = Curl_base64_encode(bvals[i].bv_val, bvals[i].bv_len,
                                         &val_b64, &val_b64_sz);
           if(!result)
             result = client_write(data, ": ", val_b64, val_b64_sz, "\n");
diff --git a/lib/pingpong.c b/lib/pingpong.c
index 84c7f51de..1453bf299 100644
--- a/lib/pingpong.c
+++ b/lib/pingpong.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -32,7 +32,6 @@
 #include "speedcheck.h"
 #include "pingpong.h"
 #include "multiif.h"
-#include "non-ascii.h"
 #include "vtls/vtls.h"
 
 /* The last 3 #include files should be in this order */
@@ -199,11 +198,6 @@ CURLcode Curl_pp_vsendf(struct Curl_easy *data,
   s = Curl_dyn_ptr(&pp->sendbuf);
   Curl_pp_init(data, pp);
 
-  result = Curl_convert_to_network(data, s, write_len);
-  /* Curl_convert_to_network calls failf if unsuccessful */
-  if(result)
-    return result;
-
 #ifdef HAVE_GSSAPI
   conn->data_prot = PROT_CMD;
 #endif
@@ -324,11 +318,6 @@ CURLcode Curl_pp_readresp(struct Curl_easy *data,
       if(result == CURLE_AGAIN)
         return CURLE_OK; /* return */
 
-      if(!result && (gotbytes > 0))
-        /* convert from the network encoding */
-        result = Curl_convert_from_network(data, ptr, gotbytes);
-      /* Curl_convert_from_network calls failf if unsuccessful */
-
       if(result)
         /* Set outer result variable to this error. */
         keepon = FALSE;
diff --git a/lib/pop3.c b/lib/pop3.c
index d4ca67877..d2fd92a4b 100644
--- a/lib/pop3.c
+++ b/lib/pop3.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -1423,7 +1423,7 @@ static CURLcode pop3_parse_url_path(struct Curl_easy *data)
   const char *path = &data->state.up.path[1]; /* skip leading path */
 
   /* URL decode the path for the message ID */
-  return Curl_urldecode(data, path, 0, &pop3->id, NULL, REJECT_CTRL);
+  return Curl_urldecode(path, 0, &pop3->id, NULL, REJECT_CTRL);
 }
 
 /***********************************************************************
@@ -1440,7 +1440,7 @@ static CURLcode pop3_parse_custom_request(struct Curl_easy *data)
 
   /* URL decode the custom request */
   if(custom)
-    result = Curl_urldecode(data, custom, 0, &pop3->custom, NULL, REJECT_CTRL);
+    result = Curl_urldecode(custom, 0, &pop3->custom, NULL, REJECT_CTRL);
 
   return result;
 }
diff --git a/lib/sendf.c b/lib/sendf.c
index bcfa27a50..220c7dd7b 100644
--- a/lib/sendf.c
+++ b/lib/sendf.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -41,7 +41,6 @@
 #include "vssh/ssh.h"
 #include "easyif.h"
 #include "multiif.h"
-#include "non-ascii.h"
 #include "strerror.h"
 #include "select.h"
 #include "strdup.h"
@@ -628,19 +627,14 @@ CURLcode Curl_client_write(struct Curl_easy *data,
 
   /* FTP data may need conversion. */
   if((type & CLIENTWRITE_BODY) &&
-    (conn->handler->protocol & PROTO_FAMILY_FTP) &&
-    conn->proto.ftpc.transfertype == 'A') {
-    /* convert from the network encoding */
-    CURLcode result = Curl_convert_from_network(data, ptr, len);
-    /* Curl_convert_from_network calls failf if unsuccessful */
-    if(result)
-      return result;
+     (conn->handler->protocol & PROTO_FAMILY_FTP) &&
+     conn->proto.ftpc.transfertype == 'A') {
 
 #ifdef CURL_DO_LINEEND_CONV
     /* convert end-of-line markers */
     len = convert_lineends(data, ptr, len);
 #endif /* CURL_DO_LINEEND_CONV */
-    }
+  }
 
   return chop_write(data, type, ptr, len);
 }
@@ -716,44 +710,6 @@ int Curl_debug(struct Curl_easy *data, curl_infotype type,
   if(data->set.verbose) {
     static const char s_infotype[CURLINFO_END][3] = {
       "* ", "< ", "> ", "{ ", "} ", "{ ", "} " };
-
-#ifdef CURL_DOES_CONVERSIONS
-    char *buf = NULL;
-    size_t conv_size = 0;
-
-    switch(type) {
-    case CURLINFO_HEADER_OUT:
-      buf = Curl_memdup(ptr, size);
-      if(!buf)
-        return 1;
-      conv_size = size;
-
-      /* Special processing is needed for this block if it
-       * contains both headers and data (separated by CRLFCRLF).
-       * We want to convert just the headers, leaving the data as-is.
-       */
-      if(size > 4) {
-        size_t i;
-        for(i = 0; i < size-4; i++) {
-          if(memcmp(&buf[i], "\x0d\x0a\x0d\x0a", 4) == 0) {
-            /* convert everything through this CRLFCRLF but no further */
-            conv_size = i + 4;
-            break;
-          }
-        }
-      }
-
-      Curl_convert_from_network(data, buf, conv_size);
-      /* Curl_convert_from_network calls failf if unsuccessful */
-      /* we might as well continue even if it fails...   */
-      ptr = buf; /* switch pointer to use my buffer instead */
-      break;
-    default:
-      /* leave everything else as-is */
-      break;
-    }
-#endif /* CURL_DOES_CONVERSIONS */
-
     if(data->set.fdebug) {
       Curl_set_in_callback(data, true);
       rc = (*data->set.fdebug)(data, type, ptr, size, data->set.debugdata);
@@ -766,20 +722,11 @@ int Curl_debug(struct Curl_easy *data, curl_infotype type,
       case CURLINFO_HEADER_IN:
         fwrite(s_infotype[type], 2, 1, data->set.err);
         fwrite(ptr, size, 1, data->set.err);
-#ifdef CURL_DOES_CONVERSIONS
-        if(size != conv_size) {
-          /* we had untranslated data so we need an explicit newline */
-          fwrite("\n", 1, 1, data->set.err);
-        }
-#endif
         break;
       default: /* nada */
         break;
       }
     }
-#ifdef CURL_DOES_CONVERSIONS
-    free(buf);
-#endif
   }
   return rc;
 }
diff --git a/lib/setopt.c b/lib/setopt.c
index c8350aa3f..6bd1a531c 100644
--- a/lib/setopt.c
+++ b/lib/setopt.c
@@ -1643,24 +1643,6 @@ CURLcode Curl_vsetopt(struct Curl_easy *data, CURLoption option, va_list param)
      */
     data->set.seek_client = va_arg(param, void *);
     break;
-  case CURLOPT_CONV_FROM_NETWORK_FUNCTION:
-    /*
-     * "Convert from network encoding" callback
-     */
-    data->set.convfromnetwork = va_arg(param, curl_conv_callback);
-    break;
-  case CURLOPT_CONV_TO_NETWORK_FUNCTION:
-    /*
-     * "Convert to network encoding" callback
-     */
-    data->set.convtonetwork = va_arg(param, curl_conv_callback);
-    break;
-  case CURLOPT_CONV_FROM_UTF8_FUNCTION:
-    /*
-     * "Convert from UTF-8 encoding" callback
-     */
-    data->set.convfromutf8 = va_arg(param, curl_conv_callback);
-    break;
   case CURLOPT_IOCTLFUNCTION:
     /*
      * I/O control callback. Might be NULL.
diff --git a/lib/smb.c b/lib/smb.c
index fd49cf6aa..bada68ee0 100644
--- a/lib/smb.c
+++ b/lib/smb.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 2016 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 2016 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  * Copyright (C) 2014, Bill Nagel <wnagel@tycoint.com>, Exacq Technologies
  *
  * This software is licensed as described in the file COPYING, which
@@ -459,10 +459,10 @@ static CURLcode smb_send_setup(struct Curl_easy *data)
   if(byte_count > sizeof(msg.bytes))
     return CURLE_FILESIZE_EXCEEDED;
 
-  Curl_ntlm_core_mk_lm_hash(data, conn->passwd, lm_hash);
+  Curl_ntlm_core_mk_lm_hash(conn->passwd, lm_hash);
   Curl_ntlm_core_lm_resp(lm_hash, smbc->challenge, lm);
 #ifdef USE_NTRESPONSES
-  Curl_ntlm_core_mk_nt_hash(data, conn->passwd, nt_hash);
+  Curl_ntlm_core_mk_nt_hash(conn->passwd, nt_hash);
   Curl_ntlm_core_lm_resp(nt_hash, smbc->challenge, nt);
 #else
   memset(nt, 0, sizeof(nt));
@@ -989,7 +989,7 @@ static CURLcode smb_parse_url_path(struct Curl_easy *data,
   char *slash;
 
   /* URL decode the path */
-  CURLcode result = Curl_urldecode(data, data->state.up.path, 0, &path, NULL,
+  CURLcode result = Curl_urldecode(data->state.up.path, 0, &path, NULL,
                                    REJECT_CTRL);
   if(result)
     return result;
diff --git a/lib/smtp.c b/lib/smtp.c
index 6c0829378..dbae801b1 100644
--- a/lib/smtp.c
+++ b/lib/smtp.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -1724,8 +1724,7 @@ static CURLcode smtp_parse_url_path(struct Curl_easy *data)
   }
 
   /* URL decode the path and use it as the domain in our EHLO */
-  return Curl_urldecode(data, path, 0, &smtpc->domain, NULL,
-                        REJECT_CTRL);
+  return Curl_urldecode(path, 0, &smtpc->domain, NULL, REJECT_CTRL);
 }
 
 /***********************************************************************
@@ -1742,7 +1741,7 @@ static CURLcode smtp_parse_custom_request(struct Curl_easy *data)
 
   /* URL decode the custom request */
   if(custom)
-    result = Curl_urldecode(data, custom, 0, &smtp->custom, NULL, REJECT_CTRL);
+    result = Curl_urldecode(custom, 0, &smtp->custom, NULL, REJECT_CTRL);
 
   return result;
 }
diff --git a/lib/strcase.c b/lib/strcase.c
index 955e3c79e..dd46ca1ba 100644
--- a/lib/strcase.c
+++ b/lib/strcase.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -28,142 +28,25 @@
 
 static char raw_tolower(char in);
 
-/* Portable, consistent toupper (remember EBCDIC). Do not use toupper() because
-   its behavior is altered by the current locale. */
+/* Portable, consistent toupper. Do not use toupper() because its behavior is
+   altered by the current locale. */
 char Curl_raw_toupper(char in)
 {
-#if !defined(CURL_DOES_CONVERSIONS)
   if(in >= 'a' && in <= 'z')
     return (char)('A' + in - 'a');
-#else
-  switch(in) {
-  case 'a':
-    return 'A';
-  case 'b':
-    return 'B';
-  case 'c':
-    return 'C';
-  case 'd':
-    return 'D';
-  case 'e':
-    return 'E';
-  case 'f':
-    return 'F';
-  case 'g':
-    return 'G';
-  case 'h':
-    return 'H';
-  case 'i':
-    return 'I';
-  case 'j':
-    return 'J';
-  case 'k':
-    return 'K';
-  case 'l':
-    return 'L';
-  case 'm':
-    return 'M';
-  case 'n':
-    return 'N';
-  case 'o':
-    return 'O';
-  case 'p':
-    return 'P';
-  case 'q':
-    return 'Q';
-  case 'r':
-    return 'R';
-  case 's':
-    return 'S';
-  case 't':
-    return 'T';
-  case 'u':
-    return 'U';
-  case 'v':
-    return 'V';
-  case 'w':
-    return 'W';
-  case 'x':
-    return 'X';
-  case 'y':
-    return 'Y';
-  case 'z':
-    return 'Z';
-  }
-#endif
-
   return in;
 }
 
 
-/* Portable, consistent tolower (remember EBCDIC). Do not use tolower() because
-   its behavior is altered by the current locale. */
+/* Portable, consistent tolower. Do not use tolower() because its behavior is
+   altered by the current locale. */
 static char raw_tolower(char in)
 {
-#if !defined(CURL_DOES_CONVERSIONS)
   if(in >= 'A' && in <= 'Z')
     return (char)('a' + in - 'A');
-#else
-  switch(in) {
-  case 'A':
-    return 'a';
-  case 'B':
-    return 'b';
-  case 'C':
-    return 'c';
-  case 'D':
-    return 'd';
-  case 'E':
-    return 'e';
-  case 'F':
-    return 'f';
-  case 'G':
-    return 'g';
-  case 'H':
-    return 'h';
-  case 'I':
-    return 'i';
-  case 'J':
-    return 'j';
-  case 'K':
-    return 'k';
-  case 'L':
-    return 'l';
-  case 'M':
-    return 'm';
-  case 'N':
-    return 'n';
-  case 'O':
-    return 'o';
-  case 'P':
-    return 'p';
-  case 'Q':
-    return 'q';
-  case 'R':
-    return 'r';
-  case 'S':
-    return 's';
-  case 'T':
-    return 't';
-  case 'U':
-    return 'u';
-  case 'V':
-    return 'v';
-  case 'W':
-    return 'w';
-  case 'X':
-    return 'x';
-  case 'Y':
-    return 'y';
-  case 'Z':
-    return 'z';
-  }
-#endif
-
   return in;
 }
 
-
 /*
  * Curl_strcasecompare() is for doing "raw" case insensitive strings. This is
  * meant to be locale independent and only compare strings we know are safe
@@ -171,9 +54,6 @@ static char raw_tolower(char in)
  * https://daniel.haxx.se/blog/2008/10/15/strcasecmp-in-turkish/ for some
  * further explanation to why this function is necessary.
  *
- * The function is capable of comparing a-z case insensitively even for
- * non-ascii.
- *
  * @unittest: 1301
  */
 
diff --git a/lib/strcase.h b/lib/strcase.h
index 10dc69881..bbd6cd85d 100644
--- a/lib/strcase.h
+++ b/lib/strcase.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -28,8 +28,7 @@
  * Only "raw" case insensitive strings. This is meant to be locale independent
  * and only compare strings we know are safe for this.
  *
- * The function is capable of comparing a-z case insensitively even for
- * non-ascii.
+ * The function is capable of comparing a-z case insensitively.
  */
 
 #define strcasecompare(a,b) Curl_strcasecompare(a,b)
diff --git a/lib/strerror.c b/lib/strerror.c
index 48f087d03..781e26b69 100644
--- a/lib/strerror.c
+++ b/lib/strerror.c
@@ -266,9 +266,6 @@ curl_easy_strerror(CURLcode error)
   case CURLE_CONV_FAILED:
     return "Conversion failed";
 
-  case CURLE_CONV_REQD:
-    return "Caller must register CURLOPT_CONV_ callback options";
-
   case CURLE_REMOTE_FILE_NOT_FOUND:
     return "Remote file not found";
 
@@ -332,6 +329,7 @@ curl_easy_strerror(CURLcode error)
   case CURLE_OBSOLETE51:
   case CURLE_OBSOLETE57:
   case CURLE_OBSOLETE62:
+  case CURLE_OBSOLETE76:
   case CURL_LAST:
     break;
   }
diff --git a/lib/tftp.c b/lib/tftp.c
index f8c68441c..d2d802565 100644
--- a/lib/tftp.c
+++ b/lib/tftp.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -463,7 +463,7 @@ static CURLcode tftp_send_first(struct tftp_state_data *state,
     /* As RFC3617 describes the separator slash is not actually part of the
        file name so we skip the always-present first letter of the path
        string. */
-    result = Curl_urldecode(data, &state->data->state.up.path[1], 0,
+    result = Curl_urldecode(&state->data->state.up.path[1], 0,
                             &filename, NULL, REJECT_ZERO);
     if(result)
       return result;
diff --git a/lib/transfer.c b/lib/transfer.c
index 22704fa15..8477bdeaa 100644
--- a/lib/transfer.c
+++ b/lib/transfer.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -73,7 +73,6 @@
 #include "select.h"
 #include "multiif.h"
 #include "connect.h"
-#include "non-ascii.h"
 #include "http2.h"
 #include "mime.h"
 #include "strcase.h"
@@ -165,20 +164,6 @@ CURLcode Curl_fillreadbuffer(struct Curl_easy *data, size_t bytes,
   curl_read_callback readfunc = NULL;
   void *extra_data = NULL;
 
-#ifdef CURL_DOES_CONVERSIONS
-  bool sending_http_headers = FALSE;
-  struct connectdata *conn = data->conn;
-
-  if(conn->handler->protocol&(PROTO_FAMILY_HTTP|CURLPROTO_RTSP)) {
-    const struct HTTP *http = data->req.p.http;
-
-    if(http->sending == HTTPSEND_REQUEST)
-      /* We're sending the HTTP request headers, not the data.
-         Remember that so we don't re-translate them into garbage. */
-      sending_http_headers = TRUE;
-  }
-#endif
-
 #ifndef CURL_DISABLE_HTTP
   if(data->state.trailers_state == TRAILERS_INITIALIZED) {
     struct curl_slist *trailers = NULL;
@@ -347,26 +332,6 @@ CURLcode Curl_fillreadbuffer(struct Curl_easy *data, size_t bytes,
       }
     }
 
-#ifdef CURL_DOES_CONVERSIONS
-    {
-      CURLcode result;
-      size_t length;
-      if(data->state.prefer_ascii)
-        /* translate the protocol and data */
-        length = nread;
-      else
-        /* just translate the protocol portion */
-        length = hexlen;
-      if(length) {
-        result = Curl_convert_to_network(data, data->req.upload_fromhere,
-                                         length);
-        /* Curl_convert_to_network calls failf if unsuccessful */
-        if(result)
-          return result;
-      }
-    }
-#endif /* CURL_DOES_CONVERSIONS */
-
 #ifndef CURL_DISABLE_HTTP
     if(data->state.trailers_state == TRAILERS_SENDING &&
        !trailers_left(data)) {
@@ -391,15 +356,6 @@ CURLcode Curl_fillreadbuffer(struct Curl_easy *data, size_t bytes,
     if(added_crlf)
       nread += strlen(endofline_network); /* for the added end of line */
   }
-#ifdef CURL_DOES_CONVERSIONS
-  else if((data->state.prefer_ascii) && (!sending_http_headers)) {
-    CURLcode result;
-    result = Curl_convert_to_network(data, data->req.upload_fromhere, nread);
-    /* Curl_convert_to_network calls failf if unsuccessful */
-    if(result)
-      return result;
-  }
-#endif /* CURL_DOES_CONVERSIONS */
 
   *nreadp = nread;
 
diff --git a/lib/url.c b/lib/url.c
index c402b1957..943f38a27 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -99,7 +99,6 @@ bool curl_win32_idn_to_ascii(const char *in, char **out);
 #include "easyif.h"
 #include "speedcheck.h"
 #include "warnless.h"
-#include "non-ascii.h"
 #include "getinfo.h"
 #include "urlapi-int.h"
 #include "system_win32.h"
@@ -445,7 +444,6 @@ CURLcode Curl_close(struct Curl_easy **datap)
   Curl_resolver_cleanup(data->state.async.resolver);
 
   Curl_http2_cleanup_dependencies(data);
-  Curl_convert_close(data);
 
   /* No longer a dirty share, if it exists */
   if(data->share) {
@@ -509,11 +507,6 @@ CURLcode Curl_init_userdefined(struct Curl_easy *data)
   set->seek_func = ZERO_NULL;
   set->seek_client = ZERO_NULL;
 
-  /* conversion callbacks for non-ASCII hosts */
-  set->convfromnetwork = ZERO_NULL;
-  set->convtonetwork   = ZERO_NULL;
-  set->convfromutf8    = ZERO_NULL;
-
   set->filesize = -1;        /* we don't know the size */
   set->postfieldsize = -1;   /* unknown size */
   set->maxredirs = -1;       /* allow any amount by default */
@@ -677,7 +670,6 @@ CURLcode Curl_open(struct Curl_easy **curl)
   result = Curl_init_userdefined(data);
   if(!result) {
     Curl_dyn_init(&data->state.headerb, CURL_MAX_HTTP_HEADER);
-    Curl_convert_init(data);
     Curl_initinfo(data);
 
     /* most recent connection is not yet defined */
@@ -2030,7 +2022,7 @@ static CURLcode parseurlandfillconn(struct Curl_easy *data,
     uc = curl_url_get(uh, CURLUPART_USER, &data->state.up.user, 0);
     if(!uc) {
       char *decoded;
-      result = Curl_urldecode(NULL, data->state.up.user, 0, &decoded, NULL,
+      result = Curl_urldecode(data->state.up.user, 0, &decoded, NULL,
                               conn->handler->flags&PROTOPT_USERPWDCTRL ?
                               REJECT_ZERO : REJECT_CTRL);
       if(result)
@@ -2049,7 +2041,7 @@ static CURLcode parseurlandfillconn(struct Curl_easy *data,
     uc = curl_url_get(uh, CURLUPART_PASSWORD, &data->state.up.password, 0);
     if(!uc) {
       char *decoded;
-      result = Curl_urldecode(NULL, data->state.up.password, 0, &decoded, NULL,
+      result = Curl_urldecode(data->state.up.password, 0, &decoded, NULL,
                               conn->handler->flags&PROTOPT_USERPWDCTRL ?
                               REJECT_ZERO : REJECT_CTRL);
       if(result)
@@ -2545,14 +2537,14 @@ static CURLcode parse_proxy_auth(struct Curl_easy *data,
   CURLcode result = CURLE_OK;
 
   if(proxyuser) {
-    result = Curl_urldecode(data, proxyuser, 0, &conn->http_proxy.user, NULL,
+    result = Curl_urldecode(proxyuser, 0, &conn->http_proxy.user, NULL,
                             REJECT_ZERO);
     if(!result)
       result = Curl_setstropt(&data->state.aptr.proxyuser,
                               conn->http_proxy.user);
   }
   if(!result && proxypasswd) {
-    result = Curl_urldecode(data, proxypasswd, 0, &conn->http_proxy.passwd,
+    result = Curl_urldecode(proxypasswd, 0, &conn->http_proxy.passwd,
                             NULL, REJECT_ZERO);
     if(!result)
       result = Curl_setstropt(&data->state.aptr.proxypasswd,
diff --git a/lib/urlapi.c b/lib/urlapi.c
index 66d6bf487..ebbc37f28 100644
--- a/lib/urlapi.c
+++ b/lib/urlapi.c
@@ -804,8 +804,7 @@ static CURLUcode decode_host(char *hostname, char **outp)
   else {
     /* might be encoded */
     size_t dlen;
-    CURLcode result = Curl_urldecode(NULL, hostname, 0,
-                                     outp, &dlen, REJECT_CTRL);
+    CURLcode result = Curl_urldecode(hostname, 0, outp, &dlen, REJECT_CTRL);
     if(result)
       return CURLUE_BAD_HOSTNAME;
   }
@@ -1420,8 +1419,7 @@ CURLUcode curl_url_get(CURLU *u, CURLUPart what,
       size_t dlen;
       /* this unconditional rejection of control bytes is documented
          API behavior */
-      CURLcode res = Curl_urldecode(NULL, *part, 0, &decoded, &dlen,
-                                    REJECT_CTRL);
+      CURLcode res = Curl_urldecode(*part, 0, &decoded, &dlen, REJECT_CTRL);
       free(*part);
       if(res) {
         *part = NULL;
diff --git a/lib/urldata.h b/lib/urldata.h
index b282cedd8..c5a96f183 100644
--- a/lib/urldata.h
+++ b/lib/urldata.h
@@ -352,10 +352,6 @@ typedef enum {
   GSS_AUTHSUCC
 } curlnegotiate;
 
-#if defined(CURL_DOES_CONVERSIONS) && defined(HAVE_ICONV)
-#include <iconv.h>
-#endif
-
 /* Struct used for GSSAPI (Kerberos V5) authentication */
 #if defined(USE_KERBEROS5)
 struct kerberos5data {
@@ -1664,13 +1660,6 @@ struct UserDefined {
   void *prereq_userp; /* pre-initial request user data */
 
   void *seek_client;    /* pointer to pass to the seek callback */
-  /* the 3 curl_conv_callback functions below are used on non-ASCII hosts */
-  /* function to convert from the network encoding: */
-  curl_conv_callback convfromnetwork;
-  /* function to convert to the network encoding: */
-  curl_conv_callback convtonetwork;
-  /* function to convert from UTF-8 encoding: */
-  curl_conv_callback convfromutf8;
 #ifndef CURL_DISABLE_HSTS
   curl_hstsread_callback hsts_read;
   void *hsts_read_userp;
@@ -1954,11 +1943,6 @@ struct Curl_easy {
   struct PureInfo info;        /* stats, reports and info data */
   struct curl_tlssessioninfo tsi; /* Information about the TLS session, only
                                      valid after a client has asked for it */
-#if defined(CURL_DOES_CONVERSIONS) && defined(HAVE_ICONV)
-  iconv_t outbound_cd;         /* for translating to the network encoding */
-  iconv_t inbound_cd;          /* for translating from the network encoding */
-  iconv_t utf8_cd;             /* for translating to UTF8 */
-#endif /* CURL_DOES_CONVERSIONS && HAVE_ICONV */
 #ifdef USE_HYPER
   struct hyptransfer hyp;
 #endif
diff --git a/lib/vauth/digest.c b/lib/vauth/digest.c
index d8aac66bd..d4616095d 100644
--- a/lib/vauth/digest.c
+++ b/lib/vauth/digest.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -40,7 +40,6 @@
 #include "warnless.h"
 #include "strtok.h"
 #include "strcase.h"
-#include "non-ascii.h" /* included for Curl_convert_... prototypes */
 #include "curl_printf.h"
 #include "rand.h"
 
@@ -56,20 +55,7 @@
 #define DIGEST_QOP_VALUE_STRING_AUTH      "auth"
 #define DIGEST_QOP_VALUE_STRING_AUTH_INT  "auth-int"
 #define DIGEST_QOP_VALUE_STRING_AUTH_CONF "auth-conf"
-
-/* The CURL_OUTPUT_DIGEST_CONV macro below is for non-ASCII machines.
-   It converts digest text to ASCII so the MD5 will be correct for
-   what ultimately goes over the network.
-*/
-#define CURL_OUTPUT_DIGEST_CONV(a, b)                  \
-  do {                                                 \
-    result = Curl_convert_to_network(a, b, strlen(b)); \
-    if(result) {                                       \
-      free(b);                                         \
-      return result;                                   \
-    }                                                  \
-  } while(0)
-#endif /* !USE_WINDOWS_SSPI */
+#endif
 
 bool Curl_auth_digest_get_pair(const char *str, char *value, char *content,
                                const char **endptr)
@@ -692,7 +678,7 @@ static CURLcode auth_create_digest_http_message(
     if(result)
       return result;
 
-    result = Curl_base64_encode(data, cnoncebuf, strlen(cnoncebuf),
+    result = Curl_base64_encode(cnoncebuf, strlen(cnoncebuf),
                                 &cnonce, &cnonce_sz);
     if(result)
       return result;
@@ -705,7 +691,6 @@ static CURLcode auth_create_digest_http_message(
     if(!hashthis)
       return CURLE_OUT_OF_MEMORY;
 
-    CURL_OUTPUT_DIGEST_CONV(data, hashthis);
     hash(hashbuf, (unsigned char *) hashthis, strlen(hashthis));
     free(hashthis);
     convert_to_ascii(hashbuf, (unsigned char *)userh);
@@ -726,7 +711,6 @@ static CURLcode auth_create_digest_http_message(
   if(!hashthis)
     return CURLE_OUT_OF_MEMORY;
 
-  CURL_OUTPUT_DIGEST_CONV(data, hashthis); /* convert on non-ASCII machines */
   hash(hashbuf, (unsigned char *) hashthis, strlen(hashthis));
   free(hashthis);
   convert_to_ascii(hashbuf, ha1);
@@ -739,7 +723,6 @@ static CURLcode auth_create_digest_http_message(
     if(!tmp)
       return CURLE_OUT_OF_MEMORY;
 
-    CURL_OUTPUT_DIGEST_CONV(data, tmp); /* Convert on non-ASCII machines */
     hash(hashbuf, (unsigned char *) tmp, strlen(tmp));
     free(tmp);
     convert_to_ascii(hashbuf, ha1);
@@ -778,7 +761,6 @@ static CURLcode auth_create_digest_http_message(
   if(!hashthis)
     return CURLE_OUT_OF_MEMORY;
 
-  CURL_OUTPUT_DIGEST_CONV(data, hashthis); /* convert on non-ASCII machines */
   hash(hashbuf, (unsigned char *) hashthis, strlen(hashthis));
   free(hashthis);
   convert_to_ascii(hashbuf, ha2);
@@ -794,7 +776,6 @@ static CURLcode auth_create_digest_http_message(
   if(!hashthis)
     return CURLE_OUT_OF_MEMORY;
 
-  CURL_OUTPUT_DIGEST_CONV(data, hashthis); /* convert on non-ASCII machines */
   hash(hashbuf, (unsigned char *) hashthis, strlen(hashthis));
   free(hashthis);
   convert_to_ascii(hashbuf, request_digest);
diff --git a/lib/vauth/ntlm.c b/lib/vauth/ntlm.c
index 04f6590ac..cb25c49eb 100644
--- a/lib/vauth/ntlm.c
+++ b/lib/vauth/ntlm.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -34,7 +34,6 @@
 #define DEBUG_ME 0
 
 #include "urldata.h"
-#include "non-ascii.h"
 #include "sendf.h"
 #include "curl_ntlm_core.h"
 #include "curl_gethostname.h"
@@ -558,7 +557,7 @@ CURLcode Curl_auth_create_ntlm_type3_message(struct Curl_easy *data,
     if(result)
       return result;
 
-    result = Curl_ntlm_core_mk_nt_hash(data, passwdp, ntbuffer);
+    result = Curl_ntlm_core_mk_nt_hash(passwdp, ntbuffer);
     if(result)
       return result;
 
@@ -633,14 +632,14 @@ CURLcode Curl_auth_create_ntlm_type3_message(struct Curl_easy *data,
     /* NTLM version 1 */
 
 #ifdef USE_NTRESPONSES
-    result = Curl_ntlm_core_mk_nt_hash(data, passwdp, ntbuffer);
+    result = Curl_ntlm_core_mk_nt_hash(passwdp, ntbuffer);
     if(result)
       return result;
 
     Curl_ntlm_core_lm_resp(ntbuffer, &ntlm->nonce[0], ntresp);
 #endif
 
-    result = Curl_ntlm_core_mk_lm_hash(data, passwdp, lmbuffer);
+    result = Curl_ntlm_core_mk_lm_hash(passwdp, lmbuffer);
     if(result)
       return result;
 
@@ -823,12 +822,6 @@ CURLcode Curl_auth_create_ntlm_type3_message(struct Curl_easy *data,
 
   size += hostlen;
 
-  /* Convert domain, user, and host to ASCII but leave the rest as-is */
-  result = Curl_convert_to_network(data, (char *)&ntlmbuf[domoff],
-                                   size - domoff);
-  if(result)
-    return CURLE_CONV_FAILED;
-
   /* Return the binary blob. */
   result = Curl_bufref_memdup(out, ntlmbuf, size);
 
diff --git a/lib/vauth/spnego_gssapi.c b/lib/vauth/spnego_gssapi.c
index 8e8932bd0..8c1a3edd0 100644
--- a/lib/vauth/spnego_gssapi.c
+++ b/lib/vauth/spnego_gssapi.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -204,16 +204,14 @@ CURLcode Curl_auth_decode_spnego_message(struct Curl_easy *data,
  *
  * Returns CURLE_OK on success.
  */
-CURLcode Curl_auth_create_spnego_message(struct Curl_easy *data,
-                                         struct negotiatedata *nego,
+CURLcode Curl_auth_create_spnego_message(struct negotiatedata *nego,
                                          char **outptr, size_t *outlen)
 {
   CURLcode result;
   OM_uint32 minor_status;
 
   /* Base64 encode the already generated response */
-  result = Curl_base64_encode(data,
-                              nego->output_token.value,
+  result = Curl_base64_encode(nego->output_token.value,
                               nego->output_token.length,
                               outptr, outlen);
 
diff --git a/lib/vauth/spnego_sspi.c b/lib/vauth/spnego_sspi.c
index 68bb17da5..d219d8bb2 100644
--- a/lib/vauth/spnego_sspi.c
+++ b/lib/vauth/spnego_sspi.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -301,27 +301,19 @@ CURLcode Curl_auth_decode_spnego_message(struct Curl_easy *data,
  *
  * Returns CURLE_OK on success.
  */
-CURLcode Curl_auth_create_spnego_message(struct Curl_easy *data,
-                                         struct negotiatedata *nego,
+CURLcode Curl_auth_create_spnego_message(struct negotiatedata *nego,
                                          char **outptr, size_t *outlen)
 {
-  CURLcode result;
-
   /* Base64 encode the already generated response */
-  result = Curl_base64_encode(data,
-                              (const char *) nego->output_token,
-                              nego->output_token_length,
-                              outptr, outlen);
-
-  if(result)
-    return result;
-
-  if(!*outptr || !*outlen) {
+  CURLcode result = Curl_base64_encode((const char *) nego->output_token,
+                                       nego->output_token_length, outptr,
+                                       outlen);
+  if(!result && (!*outptr || !*outlen)) {
     free(*outptr);
-    return CURLE_REMOTE_ACCESS_DENIED;
+    result = CURLE_REMOTE_ACCESS_DENIED;
   }
 
-  return CURLE_OK;
+  return result;
 }
 
 /*
diff --git a/lib/vauth/vauth.h b/lib/vauth/vauth.h
index 47a7c0bc8..6e1237834 100644
--- a/lib/vauth/vauth.h
+++ b/lib/vauth/vauth.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 2014 - 2021, Steve Holme, <steve_holme@hotmail.com>.
+ * Copyright (C) 2014 - 2022, Steve Holme, <steve_holme@hotmail.com>.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -219,8 +219,7 @@ CURLcode Curl_auth_decode_spnego_message(struct Curl_easy *data,
 
 /* This is used to generate a base64 encoded SPNEGO (Negotiate) response
    message */
-CURLcode Curl_auth_create_spnego_message(struct Curl_easy *data,
-                                         struct negotiatedata *nego,
+CURLcode Curl_auth_create_spnego_message(struct negotiatedata *nego,
                                          char **outptr, size_t *outlen);
 
 /* This is used to clean up the SPNEGO specifiec data */
diff --git a/lib/version.c b/lib/version.c
index c84ef85fb..e37253df2 100644
--- a/lib/version.c
+++ b/lib/version.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -46,10 +46,6 @@
 #include <libpsl.h>
 #endif
 
-#if defined(HAVE_ICONV) && defined(CURL_DOES_CONVERSIONS)
-#include <iconv.h>
-#endif
-
 #ifdef USE_LIBRTMP
 #include <librtmp/rtmp.h>
 #endif
@@ -106,7 +102,7 @@ static void zstd_version(char *buf, size_t bufsz)
  * zeros in the data.
  */
 
-#define VERSION_PARTS 17 /* number of substrings we can concatenate */
+#define VERSION_PARTS 16 /* number of substrings we can concatenate */
 
 char *curl_version(void)
 {
@@ -135,9 +131,6 @@ char *curl_version(void)
 #ifdef USE_LIBPSL
   char psl_version[40];
 #endif
-#if defined(HAVE_ICONV) && defined(CURL_DOES_CONVERSIONS)
-  char iconv_version[40]="iconv";
-#endif
 #ifdef USE_SSH
   char ssh_version[40];
 #endif
@@ -206,15 +199,7 @@ char *curl_version(void)
   msnprintf(psl_version, sizeof(psl_version), "libpsl/%s", psl_get_version());
   src[i++] = psl_version;
 #endif
-#if defined(HAVE_ICONV) && defined(CURL_DOES_CONVERSIONS)
-#ifdef _LIBICONV_VERSION
-  msnprintf(iconv_version, sizeof(iconv_version), "iconv/%d.%d",
-            _LIBICONV_VERSION >> 8, _LIBICONV_VERSION & 255);
-#else
-  /* version unknown, let the default stand */
-#endif /* _LIBICONV_VERSION */
-  src[i++] = iconv_version;
-#endif
+
 #ifdef USE_SSH
   Curl_ssh_version(ssh_version, sizeof(ssh_version));
   src[i++] = ssh_version;
@@ -433,9 +418,6 @@ static curl_version_info_data version_info = {
 #if defined(WIN32) && defined(UNICODE) && defined(_UNICODE)
   | CURL_VERSION_UNICODE
 #endif
-#if defined(CURL_DOES_CONVERSIONS)
-  | CURL_VERSION_CONV
-#endif
 #if defined(USE_TLS_SRP)
   | CURL_VERSION_TLSAUTH_SRP
 #endif
@@ -551,15 +533,6 @@ curl_version_info_data *curl_version_info(CURLversion stamp)
   version_info.features |= CURL_VERSION_IDN;
 #endif
 
-#if defined(HAVE_ICONV) && defined(CURL_DOES_CONVERSIONS)
-#ifdef _LIBICONV_VERSION
-  version_info.iconv_ver_num = _LIBICONV_VERSION;
-#else
-  /* version unknown */
-  version_info.iconv_ver_num = -1;
-#endif /* _LIBICONV_VERSION */
-#endif
-
 #if defined(USE_SSH)
   Curl_ssh_version(ssh_buffer, sizeof(ssh_buffer));
   version_info.libssh_version = ssh_buffer;
diff --git a/lib/vssh/libssh2.c b/lib/vssh/libssh2.c
index 581bc1be8..f800bebc2 100644
--- a/lib/vssh/libssh2.c
+++ b/lib/vssh/libssh2.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -661,7 +661,7 @@ static CURLcode ssh_check_fingerprint(struct Curl_easy *data)
 
     /* The length of fingerprint is 32 bytes for SHA256.
      * See libssh2_hostkey_hash documentation. */
-    if(Curl_base64_encode(data, fingerprint, 32, &fingerprint_b64,
+    if(Curl_base64_encode(fingerprint, 32, &fingerprint_b64,
                           &fingerprint_b64_len) != CURLE_OK) {
       state(data, SSH_SESSION_FREE);
       sshc->actualcode = CURLE_PEER_FAILED_VERIFICATION;
diff --git a/lib/vtls/openssl.c b/lib/vtls/openssl.c
index 060531d54..806d3dcec 100644
--- a/lib/vtls/openssl.c
+++ b/lib/vtls/openssl.c
@@ -91,7 +91,6 @@
 #endif
 
 #include "warnless.h"
-#include "non-ascii.h" /* for Curl_convert_from_utf8 prototype */
 
 /* The last #include files should be: */
 #include "curl_memory.h"
@@ -1610,40 +1609,11 @@ static void ossl_close_all(struct Curl_easy *data)
 /* ====================================================== */
 
 /*
- * Match subjectAltName against the host name. This requires a conversion
- * in CURL_DOES_CONVERSIONS builds.
+ * Match subjectAltName against the host name.
  */
 static bool subj_alt_hostcheck(struct Curl_easy *data,
                                const char *match_pattern, const char *hostname,
                                const char *dispname)
-#ifdef CURL_DOES_CONVERSIONS
-{
-  bool res = FALSE;
-
-  /* Curl_cert_hostcheck uses host encoding, but we get ASCII from
-     OpenSSl.
-   */
-  char *match_pattern2 = strdup(match_pattern);
-
-  if(match_pattern2) {
-    if(Curl_convert_from_network(data, match_pattern2,
-                                strlen(match_pattern2)) == CURLE_OK) {
-      if(Curl_cert_hostcheck(match_pattern2, hostname)) {
-        res = TRUE;
-        infof(data,
-                " subjectAltName: host \"%s\" matched cert's \"%s\"",
-                dispname, match_pattern2);
-      }
-    }
-    free(match_pattern2);
-  }
-  else {
-    failf(data,
-        "SSL: out of memory when allocating temporary for subjectAltName");
-  }
-  return res;
-}
-#else
 {
 #ifdef CURL_DISABLE_VERBOSE_STRINGS
   (void)dispname;
@@ -1656,8 +1626,6 @@ static bool subj_alt_hostcheck(struct Curl_easy *data,
   }
   return FALSE;
 }
-#endif
-
 
 /* Quote from RFC2818 section 3.1 "Server Identity"
 
@@ -1845,16 +1813,6 @@ CURLcode Curl_ossl_verifyhost(struct Curl_easy *data, struct connectdata *conn,
 
     if(peer_CN == nulstr)
        peer_CN = NULL;
-    else {
-      /* convert peer_CN from UTF8 */
-      CURLcode rc = Curl_convert_from_utf8(data, (char *)peer_CN,
-                                           strlen((char *)peer_CN));
-      /* Curl_convert_from_utf8 calls failf if unsuccessful */
-      if(rc) {
-        OPENSSL_free(peer_CN);
-        return rc;
-      }
-    }
 
     if(result)
       /* error already detected, pass through */
diff --git a/lib/vtls/vtls.c b/lib/vtls/vtls.c
index b3bd87303..41714d54b 100644
--- a/lib/vtls/vtls.c
+++ b/lib/vtls/vtls.c
@@ -995,7 +995,7 @@ CURLcode Curl_pin_peer_pubkey(struct Curl_easy *data,
     if(encode != CURLE_OK)
       return encode;
 
-    encode = Curl_base64_encode(data, (char *)sha256sumdigest,
+    encode = Curl_base64_encode((char *)sha256sumdigest,
                                 CURL_SHA256_DIGEST_LENGTH, &encoded,
                                 &encodedlen);
     Curl_safefree(sha256sumdigest);
diff --git a/lib/x509asn1.c b/lib/x509asn1.c
index 0341543a2..64cf5f15d 100644
--- a/lib/x509asn1.c
+++ b/lib/x509asn1.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -1119,7 +1119,7 @@ CURLcode Curl_extract_certinfo(struct Curl_easy *data,
     return result;
 
   /* Generate PEM certificate. */
-  result = Curl_base64_encode(data, cert.certificate.beg,
+  result = Curl_base64_encode(cert.certificate.beg,
                               cert.certificate.end - cert.certificate.beg,
                               &cp1, &cl1);
   if(result)