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-rw-r--r--lib/bufref.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/lib/bufref.c b/lib/bufref.c
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+++ b/lib/bufref.c
@@ -0,0 +1,127 @@
+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 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"
+#include "urldata.h"
+#include "bufref.h"
+
+#include "curl_memory.h"
+#include "memdebug.h"
+
+#define SIGNATURE 0x5c48e9b2 /* Random pattern. */
+
+/*
+ * Init a bufref struct.
+ */
+void Curl_bufref_init(struct bufref *br)
+{
+ DEBUGASSERT(br);
+ br->dtor = NULL;
+ br->ptr = NULL;
+ br->len = 0;
+
+#ifdef DEBUGBUILD
+ br->signature = SIGNATURE;
+#endif
+}
+
+/*
+ * Free the buffer and re-init the necessary fields. It doesn't touch the
+ * 'signature' field and thus this buffer reference can be reused.
+ */
+
+void Curl_bufref_free(struct bufref *br)
+{
+ DEBUGASSERT(br);
+ DEBUGASSERT(br->signature == SIGNATURE);
+ DEBUGASSERT(br->ptr || !br->len);
+
+ if(br->ptr && br->dtor)
+ br->dtor((void *) br->ptr);
+
+ br->dtor = NULL;
+ br->ptr = NULL;
+ br->len = 0;
+}
+
+/*
+ * Set the buffer reference to new values. The previously referenced buffer
+ * is released before assignment.
+ */
+void Curl_bufref_set(struct bufref *br, const void *ptr, size_t len,
+ void (*dtor)(void *))
+{
+ DEBUGASSERT(ptr || !len);
+ DEBUGASSERT(len <= CURL_MAX_INPUT_LENGTH);
+
+ Curl_bufref_free(br);
+ br->ptr = (const unsigned char *) ptr;
+ br->len = len;
+ br->dtor = dtor;
+}
+
+/*
+ * Get a pointer to the referenced buffer.
+ */
+const unsigned char *Curl_bufref_ptr(const struct bufref *br)
+{
+ DEBUGASSERT(br);
+ DEBUGASSERT(br->signature == SIGNATURE);
+ DEBUGASSERT(br->ptr || !br->len);
+
+ return br->ptr;
+}
+
+/*
+ * Get the length of the referenced buffer data.
+ */
+size_t Curl_bufref_len(const struct bufref *br)
+{
+ DEBUGASSERT(br);
+ DEBUGASSERT(br->signature == SIGNATURE);
+ DEBUGASSERT(br->ptr || !br->len);
+
+ return br->len;
+}
+
+CURLcode Curl_bufref_memdup(struct bufref *br, const void *ptr, size_t len)
+{
+ unsigned char *cpy = NULL;
+
+ DEBUGASSERT(br);
+ DEBUGASSERT(br->signature == SIGNATURE);
+ DEBUGASSERT(br->ptr || !br->len);
+ DEBUGASSERT(ptr || !len);
+ DEBUGASSERT(len <= CURL_MAX_INPUT_LENGTH);
+
+ if(ptr) {
+ cpy = malloc(len + 1);
+ if(!cpy)
+ return CURLE_OUT_OF_MEMORY;
+ if(len)
+ memcpy(cpy, ptr, len);
+ cpy[len] = '\0';
+ }
+
+ Curl_bufref_set(br, cpy, len, curl_free);
+ return CURLE_OK;
+}