Move Encode from ext/ to cpan/

1 files changed, 953 insertions, 0 deletions

diff --git a/cpan/Encode/Encode.xs b/cpan/Encode/Encode.xs
new file mode 100644
index 0000000000..e5f4c9a32d
--- /dev/null
+++ b/cpan/Encode/Encode.xs
@@ -0,0 +1,953 @@
+/*
+ $Id: Encode.xs,v 2.16 2009/09/06 14:32:21 dankogai Exp dankogai $
+ */
+
+#define PERL_NO_GET_CONTEXT
+#include "EXTERN.h"
+#include "perl.h"
+#include "XSUB.h"
+#define U8 U8
+#include "encode.h"
+
+# define PERLIO_MODNAME  "PerlIO::encoding"
+# define PERLIO_FILENAME "PerlIO/encoding.pm"
+
+/* set 1 or more to profile.  t/encoding.t dumps core because of
+   Perl_warner and PerlIO don't work well */
+#define ENCODE_XS_PROFILE 0
+
+/* set 0 to disable floating point to calculate buffer size for
+   encode_method().  1 is recommended. 2 restores NI-S original */
+#define ENCODE_XS_USEFP   1
+
+#define UNIMPLEMENTED(x,y) y x (SV *sv, char *encoding) {dTHX;   \
+                         Perl_croak(aTHX_ "panic_unimplemented"); \
+             return (y)0; /* fool picky compilers */ \
+                         }
+/**/
+
+UNIMPLEMENTED(_encoded_utf8_to_bytes, I32)
+UNIMPLEMENTED(_encoded_bytes_to_utf8, I32)
+
+#define UTF8_ALLOW_STRICT 0
+#define UTF8_ALLOW_NONSTRICT (UTF8_ALLOW_ANY &                    \
+                              ~(UTF8_ALLOW_CONTINUATION |         \
+                                UTF8_ALLOW_NON_CONTINUATION |     \
+                                UTF8_ALLOW_LONG))
+
+void
+Encode_XSEncoding(pTHX_ encode_t * enc)
+{
+    dSP;
+    HV *stash = gv_stashpv("Encode::XS", TRUE);
+    SV *sv = sv_bless(newRV_noinc(newSViv(PTR2IV(enc))), stash);
+    int i = 0;
+    PUSHMARK(sp);
+    XPUSHs(sv);
+    while (enc->name[i]) {
+    const char *name = enc->name[i++];
+    XPUSHs(sv_2mortal(newSVpvn(name, strlen(name))));
+    }
+    PUTBACK;
+    call_pv("Encode::define_encoding", G_DISCARD);
+    SvREFCNT_dec(sv);
+}
+
+void
+call_failure(SV * routine, U8 * done, U8 * dest, U8 * orig)
+{
+    /* Exists for breakpointing */
+}
+
+
+#define ERR_ENCODE_NOMAP "\"\\x{%04" UVxf "}\" does not map to %s"
+#define ERR_DECODE_NOMAP "%s \"\\x%02" UVXf "\" does not map to Unicode"
+
+static SV *
+do_fallback_cb(pTHX_ UV ch, SV *fallback_cb)
+{
+    dSP;
+    int argc;
+    SV *temp, *retval;
+    ENTER;
+    SAVETMPS;
+    PUSHMARK(sp);
+    XPUSHs(sv_2mortal(newSVnv((UV)ch)));
+    PUTBACK;
+    argc = call_sv(fallback_cb, G_SCALAR);
+    SPAGAIN;
+    if (argc != 1){
+	croak("fallback sub must return scalar!");
+    }
+    temp = newSVsv(POPs);
+    PUTBACK;
+    FREETMPS;
+    LEAVE;
+    retval = newSVpv("",0);
+    sv_catsv(retval, temp);
+    SvREFCNT_dec(temp);
+    return retval;
+}
+
+static SV *
+encode_method(pTHX_ const encode_t * enc, const encpage_t * dir, SV * src,
+	      int check, STRLEN * offset, SV * term, int * retcode, 
+	      SV *fallback_cb)
+{
+    STRLEN slen;
+    U8 *s = (U8 *) SvPV(src, slen);
+    STRLEN tlen  = slen;
+    STRLEN ddone = 0;
+    STRLEN sdone = 0;
+
+    /* We allocate slen+1.
+       PerlIO dumps core if this value is smaller than this. */
+    SV *dst = sv_2mortal(newSV(slen+1));
+    U8 *d = (U8 *)SvPVX(dst);
+    STRLEN dlen = SvLEN(dst)-1;
+    int code = 0;
+    STRLEN trmlen = 0;
+    U8 *trm = term ? (U8*) SvPV(term, trmlen) : NULL;
+
+    if (offset) {
+      s += *offset;
+      if (slen > *offset){ /* safeguard against slen overflow */
+      slen -= *offset;
+      }else{
+      slen = 0;
+      }
+      tlen = slen;
+    }
+
+    if (slen == 0){
+    SvCUR_set(dst, 0);
+    SvPOK_only(dst);
+    goto ENCODE_END;
+    }
+
+    while( (code = do_encode(dir, s, &slen, d, dlen, &dlen, !check,
+                 trm, trmlen)) ) 
+    {
+    SvCUR_set(dst, dlen+ddone);
+    SvPOK_only(dst);
+    
+    if (code == ENCODE_FALLBACK || code == ENCODE_PARTIAL ||
+        code == ENCODE_FOUND_TERM) {
+        break;
+    }
+    switch (code) {
+    case ENCODE_NOSPACE:
+    {	
+        STRLEN more = 0; /* make sure you initialize! */
+        STRLEN sleft;
+        sdone += slen;
+        ddone += dlen;
+        sleft = tlen - sdone;
+#if ENCODE_XS_PROFILE >= 2
+        Perl_warn(aTHX_
+              "more=%d, sdone=%d, sleft=%d, SvLEN(dst)=%d\n",
+              more, sdone, sleft, SvLEN(dst));
+#endif
+        if (sdone != 0) { /* has src ever been processed ? */
+#if   ENCODE_XS_USEFP == 2
+        more = (1.0*tlen*SvLEN(dst)+sdone-1)/sdone
+            - SvLEN(dst);
+#elif ENCODE_XS_USEFP
+        more = (STRLEN)((1.0*SvLEN(dst)+1)/sdone * sleft);
+#else
+        /* safe until SvLEN(dst) == MAX_INT/16 */
+        more = (16*SvLEN(dst)+1)/sdone/16 * sleft;
+#endif
+        }
+        more += UTF8_MAXLEN; /* insurance policy */
+        d = (U8 *) SvGROW(dst, SvLEN(dst) + more);
+        /* dst need to grow need MORE bytes! */
+        if (ddone >= SvLEN(dst)) {
+        Perl_croak(aTHX_ "Destination couldn't be grown.");
+        }
+        dlen = SvLEN(dst)-ddone-1;
+        d   += ddone;
+        s   += slen;
+        slen = tlen-sdone;
+        continue;
+    }
+    case ENCODE_NOREP:
+        /* encoding */	
+        if (dir == enc->f_utf8) {
+        STRLEN clen;
+        UV ch =
+            utf8n_to_uvuni(s+slen, (SvCUR(src)-slen),
+                   &clen, UTF8_ALLOW_ANY|UTF8_CHECK_ONLY);
+        /* if non-representable multibyte prefix at end of current buffer - break*/
+        if (clen > tlen - sdone) break;
+        if (check & ENCODE_DIE_ON_ERR) {
+            Perl_croak(aTHX_ ERR_ENCODE_NOMAP,
+                   (UV)ch, enc->name[0]);
+            return &PL_sv_undef; /* never reaches but be safe */
+        }
+        if (check & ENCODE_WARN_ON_ERR){
+            Perl_warner(aTHX_ packWARN(WARN_UTF8),
+                ERR_ENCODE_NOMAP, (UV)ch, enc->name[0]);
+        }
+        if (check & ENCODE_RETURN_ON_ERR){
+            goto ENCODE_SET_SRC;
+        }
+        if (check & (ENCODE_PERLQQ|ENCODE_HTMLCREF|ENCODE_XMLCREF)){
+            SV* subchar = 
+            (fallback_cb != &PL_sv_undef)
+		? do_fallback_cb(aTHX_ ch, fallback_cb)
+		: newSVpvf(check & ENCODE_PERLQQ ? "\\x{%04"UVxf"}" :
+                 check & ENCODE_HTMLCREF ? "&#%" UVuf ";" :
+                 "&#x%" UVxf ";", (UV)ch);
+            sdone += slen + clen;
+            ddone += dlen + SvCUR(subchar);
+            sv_catsv(dst, subchar);
+            SvREFCNT_dec(subchar);
+        } else {
+            /* fallback char */
+            sdone += slen + clen;
+            ddone += dlen + enc->replen;
+            sv_catpvn(dst, (char*)enc->rep, enc->replen);
+        }
+        }
+        /* decoding */
+        else {
+        if (check & ENCODE_DIE_ON_ERR){
+            Perl_croak(aTHX_ ERR_DECODE_NOMAP,
+                              enc->name[0], (UV)s[slen]);
+            return &PL_sv_undef; /* never reaches but be safe */
+        }
+        if (check & ENCODE_WARN_ON_ERR){
+            Perl_warner(
+            aTHX_ packWARN(WARN_UTF8),
+            ERR_DECODE_NOMAP,
+               	        enc->name[0], (UV)s[slen]);
+        }
+        if (check & ENCODE_RETURN_ON_ERR){
+            goto ENCODE_SET_SRC;
+        }
+        if (check &
+            (ENCODE_PERLQQ|ENCODE_HTMLCREF|ENCODE_XMLCREF)){
+            SV* subchar = 
+            (fallback_cb != &PL_sv_undef)
+		? do_fallback_cb(aTHX_ (UV)s[slen], fallback_cb) 
+		: newSVpvf("\\x%02" UVXf, (UV)s[slen]);
+            sdone += slen + 1;
+            ddone += dlen + SvCUR(subchar);
+            sv_catsv(dst, subchar);
+            SvREFCNT_dec(subchar);
+        } else {
+            sdone += slen + 1;
+            ddone += dlen + strlen(FBCHAR_UTF8);
+            sv_catpv(dst, FBCHAR_UTF8);
+        }
+        }
+        /* settle variables when fallback */
+        d    = (U8 *)SvEND(dst);
+            dlen = SvLEN(dst) - ddone - 1;
+        s    = (U8*)SvPVX(src) + sdone;
+        slen = tlen - sdone;
+        break;
+
+    default:
+        Perl_croak(aTHX_ "Unexpected code %d converting %s %s",
+               code, (dir == enc->f_utf8) ? "to" : "from",
+               enc->name[0]);
+        return &PL_sv_undef;
+    }
+    }
+ ENCODE_SET_SRC:
+    if (check && !(check & ENCODE_LEAVE_SRC)){
+    sdone = SvCUR(src) - (slen+sdone);
+    if (sdone) {
+        sv_setpvn(src, (char*)s+slen, sdone);
+    }
+    SvCUR_set(src, sdone);
+    }
+    /* warn("check = 0x%X, code = 0x%d\n", check, code); */
+
+    SvCUR_set(dst, dlen+ddone);
+    SvPOK_only(dst);
+
+#if ENCODE_XS_PROFILE
+    if (SvCUR(dst) > SvCUR(src)){
+    Perl_warn(aTHX_
+          "SvLEN(dst)=%d, SvCUR(dst)=%d. %d bytes unused(%f %%)\n",
+          SvLEN(dst), SvCUR(dst), SvLEN(dst) - SvCUR(dst),
+          (SvLEN(dst) - SvCUR(dst))*1.0/SvLEN(dst)*100.0);
+    }
+#endif
+
+    if (offset) 
+      *offset += sdone + slen;
+
+ ENCODE_END:
+    *SvEND(dst) = '\0';
+    if (retcode) *retcode = code;
+    return dst;
+}
+
+static bool
+strict_utf8(pTHX_ SV* sv)
+{
+    HV* hv;
+    SV** svp;
+    sv = SvRV(sv);
+    if (!sv || SvTYPE(sv) != SVt_PVHV)
+        return 0;
+    hv = (HV*)sv;
+    svp = hv_fetch(hv, "strict_utf8", 11, 0);
+    if (!svp)
+        return 0;
+    return SvTRUE(*svp);
+}
+
+static U8*
+process_utf8(pTHX_ SV* dst, U8* s, U8* e, int check,
+             bool encode, bool strict, bool stop_at_partial)
+{
+    UV uv;
+    STRLEN ulen;
+
+    SvPOK_only(dst);
+    SvCUR_set(dst,0);
+
+    while (s < e) {
+        if (UTF8_IS_INVARIANT(*s)) {
+            sv_catpvn(dst, (char *)s, 1);
+            s++;
+            continue;
+        }
+
+        if (UTF8_IS_START(*s)) {
+            U8 skip = UTF8SKIP(s);
+            if ((s + skip) > e) {
+                /* Partial character */
+                /* XXX could check that rest of bytes are UTF8_IS_CONTINUATION(ch) */
+                if (stop_at_partial || (check & ENCODE_STOP_AT_PARTIAL))
+                    break;
+
+                goto malformed_byte;
+            }
+
+            uv = utf8n_to_uvuni(s, e - s, &ulen,
+                                UTF8_CHECK_ONLY | (strict ? UTF8_ALLOW_STRICT :
+                                                            UTF8_ALLOW_NONSTRICT)
+                               );
+#if 1 /* perl-5.8.6 and older do not check UTF8_ALLOW_LONG */
+        if (strict && uv > PERL_UNICODE_MAX)
+        ulen = (STRLEN) -1;
+#endif
+            if (ulen == -1) {
+                if (strict) {
+                    uv = utf8n_to_uvuni(s, e - s, &ulen,
+                                        UTF8_CHECK_ONLY | UTF8_ALLOW_NONSTRICT);
+                    if (ulen == -1)
+                        goto malformed_byte;
+                    goto malformed;
+                }
+                goto malformed_byte;
+            }
+
+
+             /* Whole char is good */
+             sv_catpvn(dst,(char *)s,skip);
+             s += skip;
+             continue;
+        }
+
+        /* If we get here there is something wrong with alleged UTF-8 */
+    malformed_byte:
+        uv = (UV)*s;
+        ulen = 1;
+
+    malformed:
+        if (check & ENCODE_DIE_ON_ERR){
+            if (encode)
+                Perl_croak(aTHX_ ERR_ENCODE_NOMAP, uv, "utf8");
+            else
+                Perl_croak(aTHX_ ERR_DECODE_NOMAP, "utf8", uv);
+        }
+        if (check & ENCODE_WARN_ON_ERR){
+            if (encode)
+                Perl_warner(aTHX_ packWARN(WARN_UTF8),
+                            ERR_ENCODE_NOMAP, uv, "utf8");
+            else
+                Perl_warner(aTHX_ packWARN(WARN_UTF8),
+                            ERR_DECODE_NOMAP, "utf8", uv);
+        }
+        if (check & ENCODE_RETURN_ON_ERR) {
+                break;
+        }
+        if (check & (ENCODE_PERLQQ|ENCODE_HTMLCREF|ENCODE_XMLCREF)){
+            SV* subchar = newSVpvf(check & ENCODE_PERLQQ ? (ulen == 1 ? "\\x%02" UVXf : "\\x{%04" UVXf "}"):
+                                   check & ENCODE_HTMLCREF ? "&#%" UVuf ";" :
+                                   "&#x%" UVxf ";", uv);
+            sv_catsv(dst, subchar);
+            SvREFCNT_dec(subchar);
+        } else {
+            sv_catpv(dst, FBCHAR_UTF8);
+        }
+        s += ulen;
+    }
+    *SvEND(dst) = '\0';
+
+    return s;
+}
+
+
+MODULE = Encode		PACKAGE = Encode::utf8	PREFIX = Method_
+
+PROTOTYPES: DISABLE
+
+void
+Method_decode_xs(obj,src,check = 0)
+SV *	obj
+SV *	src
+int	check
+PREINIT:
+    STRLEN slen;
+    U8 *s;
+    U8 *e;
+    SV *dst;
+    bool renewed = 0;
+CODE:
+{
+    dSP; ENTER; SAVETMPS;
+    if (src == &PL_sv_undef) src = newSV(0);
+    s = (U8 *) SvPV(src, slen);
+    e = (U8 *) SvEND(src);
+    dst = newSV(slen>0?slen:1); /* newSV() abhors 0 -- inaba */
+
+    /* 
+     * PerlIO check -- we assume the object is of PerlIO if renewed
+     */
+    PUSHMARK(sp);
+    XPUSHs(obj);
+    PUTBACK;
+    if (call_method("renewed",G_SCALAR) == 1) {
+    SPAGAIN;
+    renewed = (bool)POPi;
+    PUTBACK; 
+#if 0
+    fprintf(stderr, "renewed == %d\n", renewed);
+#endif
+    }
+    FREETMPS; LEAVE;
+    /* end PerlIO check */
+
+    if (SvUTF8(src)) {
+    s = utf8_to_bytes(s,&slen);
+    if (s) {
+        SvCUR_set(src,slen);
+        SvUTF8_off(src);
+        e = s+slen;
+    }
+    else {
+        croak("Cannot decode string with wide characters");
+    }
+    }
+
+    s = process_utf8(aTHX_ dst, s, e, check, 0, strict_utf8(aTHX_ obj), renewed);
+
+    /* Clear out translated part of source unless asked not to */
+    if (check && !(check & ENCODE_LEAVE_SRC)){
+    slen = e-s;
+    if (slen) {
+        sv_setpvn(src, (char*)s, slen);
+    }
+    SvCUR_set(src, slen);
+    }
+    SvUTF8_on(dst);
+    ST(0) = sv_2mortal(dst);
+    XSRETURN(1);
+}
+
+void
+Method_encode_xs(obj,src,check = 0)
+SV *	obj
+SV *	src
+int	check
+PREINIT:
+    STRLEN slen;
+    U8 *s;
+    U8 *e;
+    SV *dst;
+    bool renewed = 0;
+CODE:
+{
+    if (src == &PL_sv_undef) src = newSV(0);
+    s = (U8 *) SvPV(src, slen);
+    e = (U8 *) SvEND(src);
+    dst = newSV(slen>0?slen:1); /* newSV() abhors 0 -- inaba */
+    if (SvUTF8(src)) {
+    /* Already encoded */
+    if (strict_utf8(aTHX_ obj)) {
+        s = process_utf8(aTHX_ dst, s, e, check, 1, 1, 0);
+    }
+        else {
+            /* trust it and just copy the octets */
+    	    sv_setpvn(dst,(char *)s,(e-s));
+        s = e;
+        }
+    }
+    else {
+    	/* Native bytes - can always encode */
+    U8 *d = (U8 *) SvGROW(dst, 2*slen+1); /* +1 or assertion will botch */
+    	while (s < e) {
+    	    UV uv = NATIVE_TO_UNI((UV) *s);
+	    s++; /* Above expansion of NATIVE_TO_UNI() is safer this way. */
+            if (UNI_IS_INVARIANT(uv))
+            	*d++ = (U8)UTF_TO_NATIVE(uv);
+            else {
+    	        *d++ = (U8)UTF8_EIGHT_BIT_HI(uv);
+                *d++ = (U8)UTF8_EIGHT_BIT_LO(uv);
+            }
+    }
+        SvCUR_set(dst, d- (U8 *)SvPVX(dst));
+    	*SvEND(dst) = '\0';
+    }
+
+    /* Clear out translated part of source unless asked not to */
+    if (check && !(check & ENCODE_LEAVE_SRC)){
+    slen = e-s;
+    if (slen) {
+        sv_setpvn(src, (char*)s, slen);
+    }
+    SvCUR_set(src, slen);
+    }
+    SvPOK_only(dst);
+    SvUTF8_off(dst);
+    ST(0) = sv_2mortal(dst);
+    XSRETURN(1);
+}
+
+MODULE = Encode		PACKAGE = Encode::XS	PREFIX = Method_
+
+PROTOTYPES: ENABLE
+
+void
+Method_renew(obj)
+SV *	obj
+CODE:
+{
+    XSRETURN(1);
+}
+
+int
+Method_renewed(obj)
+SV *    obj
+CODE:
+    RETVAL = 0;
+OUTPUT:
+    RETVAL
+
+void
+Method_name(obj)
+SV *	obj
+CODE:
+{
+    encode_t *enc = INT2PTR(encode_t *, SvIV(SvRV(obj)));
+    ST(0) = sv_2mortal(newSVpvn(enc->name[0],strlen(enc->name[0])));
+    XSRETURN(1);
+}
+
+void
+Method_cat_decode(obj, dst, src, off, term, check_sv = &PL_sv_no)
+SV *	obj
+SV *	dst
+SV *	src
+SV *	off
+SV *	term
+SV *    check_sv
+CODE:
+{
+    int check;
+    SV *fallback_cb = &PL_sv_undef;
+    encode_t *enc = INT2PTR(encode_t *, SvIV(SvRV(obj)));
+    STRLEN offset = (STRLEN)SvIV(off);
+    int code = 0;
+    if (SvUTF8(src)) {
+    	sv_utf8_downgrade(src, FALSE);
+    }
+    if (SvROK(check_sv)){
+	fallback_cb = check_sv;
+	check = ENCODE_PERLQQ|ENCODE_LEAVE_SRC; /* same as FB_PERLQQ */
+    }else{
+	check = SvIV(check_sv);
+    }
+    sv_catsv(dst, encode_method(aTHX_ enc, enc->t_utf8, src, check,
+                &offset, term, &code, fallback_cb));
+    SvIV_set(off, (IV)offset);
+    if (code == ENCODE_FOUND_TERM) {
+    ST(0) = &PL_sv_yes;
+    }else{
+    ST(0) = &PL_sv_no;
+    }
+    XSRETURN(1);
+}
+
+void
+Method_decode(obj,src,check_sv = &PL_sv_no)
+SV *	obj
+SV *	src
+SV *	check_sv
+CODE:
+{
+    int check;
+    SV *fallback_cb = &PL_sv_undef;
+    encode_t *enc = INT2PTR(encode_t *, SvIV(SvRV(obj)));
+    if (SvUTF8(src)) {
+    	sv_utf8_downgrade(src, FALSE);
+    }
+    if (SvROK(check_sv)){
+	fallback_cb = check_sv;
+	check = ENCODE_PERLQQ|ENCODE_LEAVE_SRC; /* same as FB_PERLQQ */
+    }else{
+	check = SvIV(check_sv);
+    }
+    ST(0) = encode_method(aTHX_ enc, enc->t_utf8, src, check,
+              NULL, Nullsv, NULL, fallback_cb);
+    SvUTF8_on(ST(0));
+    XSRETURN(1);
+}
+
+void
+Method_encode(obj,src,check_sv = &PL_sv_no)
+SV *	obj
+SV *	src
+SV *	check_sv
+CODE:
+{
+    int check;
+    SV *fallback_cb = &PL_sv_undef;
+    encode_t *enc = INT2PTR(encode_t *, SvIV(SvRV(obj)));
+    sv_utf8_upgrade(src);
+    if (SvROK(check_sv)){
+	fallback_cb = check_sv;
+	check = ENCODE_PERLQQ|ENCODE_LEAVE_SRC; /* same as FB_PERLQQ */
+    }else{
+	check = SvIV(check_sv);
+    }
+    ST(0) = encode_method(aTHX_ enc, enc->f_utf8, src, check,
+              NULL, Nullsv, NULL, fallback_cb);
+    XSRETURN(1);
+}
+
+void
+Method_needs_lines(obj)
+SV *	obj
+CODE:
+{
+    /* encode_t *enc = INT2PTR(encode_t *, SvIV(SvRV(obj))); */
+    ST(0) = &PL_sv_no;
+    XSRETURN(1);
+}
+
+void
+Method_perlio_ok(obj)
+SV *	obj
+CODE:
+{
+    /* encode_t *enc = INT2PTR(encode_t *, SvIV(SvRV(obj))); */
+    /* require_pv(PERLIO_FILENAME); */
+
+    eval_pv("require PerlIO::encoding", 0);
+
+    if (SvTRUE(get_sv("@", 0))) {
+    ST(0) = &PL_sv_no;
+    }else{
+    ST(0) = &PL_sv_yes;
+    }
+    XSRETURN(1);
+}
+
+void
+Method_mime_name(obj)
+SV *	obj
+CODE:
+{
+    encode_t *enc = INT2PTR(encode_t *, SvIV(SvRV(obj)));
+    SV *retval;
+    eval_pv("require Encode::MIME::Name", 0);
+
+    if (SvTRUE(get_sv("@", 0))) {
+	ST(0) = &PL_sv_undef;
+    }else{
+	ENTER;
+	SAVETMPS;
+	PUSHMARK(sp);
+	XPUSHs(sv_2mortal(newSVpvn(enc->name[0], strlen(enc->name[0]))));
+	PUTBACK;
+	call_pv("Encode::MIME::Name::get_mime_name", G_SCALAR);
+	SPAGAIN;
+	retval = newSVsv(POPs);
+	PUTBACK;
+	FREETMPS;
+	LEAVE;
+	/* enc->name[0] */
+	ST(0) = retval;
+    }
+    XSRETURN(1);
+}
+
+MODULE = Encode         PACKAGE = Encode
+
+PROTOTYPES: ENABLE
+
+I32
+_bytes_to_utf8(sv, ...)
+SV *    sv
+CODE:
+{
+    SV * encoding = items == 2 ? ST(1) : Nullsv;
+
+    if (encoding)
+    RETVAL = _encoded_bytes_to_utf8(sv, SvPV_nolen(encoding));
+    else {
+    STRLEN len;
+    U8*    s = (U8*)SvPV(sv, len);
+    U8*    converted;
+
+    converted = bytes_to_utf8(s, &len); /* This allocs */
+    sv_setpvn(sv, (char *)converted, len);
+    SvUTF8_on(sv); /* XXX Should we? */
+    Safefree(converted);                /* ... so free it */
+    RETVAL = len;
+    }
+}
+OUTPUT:
+    RETVAL
+
+I32
+_utf8_to_bytes(sv, ...)
+SV *    sv
+CODE:
+{
+    SV * to    = items > 1 ? ST(1) : Nullsv;
+    SV * check = items > 2 ? ST(2) : Nullsv;
+
+    if (to) {
+    RETVAL = _encoded_utf8_to_bytes(sv, SvPV_nolen(to));
+    } else {
+    STRLEN len;
+    U8 *s = (U8*)SvPV(sv, len);
+
+    RETVAL = 0;
+    if (SvTRUE(check)) {
+        /* Must do things the slow way */
+        U8 *dest;
+            /* We need a copy to pass to check() */
+        U8 *src  = s;
+        U8 *send = s + len;
+        U8 *d0;
+
+        New(83, dest, len, U8); /* I think */
+        d0 = dest;
+
+        while (s < send) {
+                if (*s < 0x80){
+            *dest++ = *s++;
+                } else {
+            STRLEN ulen;
+            UV uv = *s++;
+
+            /* Have to do it all ourselves because of error routine,
+               aargh. */
+            if (!(uv & 0x40)){ goto failure; }
+            if      (!(uv & 0x20)) { ulen = 2;  uv &= 0x1f; }
+            else if (!(uv & 0x10)) { ulen = 3;  uv &= 0x0f; }
+            else if (!(uv & 0x08)) { ulen = 4;  uv &= 0x07; }
+            else if (!(uv & 0x04)) { ulen = 5;  uv &= 0x03; }
+            else if (!(uv & 0x02)) { ulen = 6;  uv &= 0x01; }
+            else if (!(uv & 0x01)) { ulen = 7;  uv = 0; }
+            else                   { ulen = 13; uv = 0; }
+        
+            /* Note change to utf8.c variable naming, for variety */
+            while (ulen--) {
+            if ((*s & 0xc0) != 0x80){
+                goto failure;
+            } else {
+                uv = (uv << 6) | (*s++ & 0x3f);
+            }
+          }
+          if (uv > 256) {
+          failure:
+              call_failure(check, s, dest, src);
+              /* Now what happens? */
+          }
+          *dest++ = (U8)uv;
+        }
+        }
+        RETVAL = dest - d0;
+        sv_usepvn(sv, (char *)dest, RETVAL);
+        SvUTF8_off(sv);
+    } else {
+        RETVAL = (utf8_to_bytes(s, &len) ? len : 0);
+    }
+    }
+}
+OUTPUT:
+    RETVAL
+
+bool
+is_utf8(sv, check = 0)
+SV *	sv
+int	check
+CODE:
+{
+    if (SvGMAGICAL(sv)) /* it could be $1, for example */
+    sv = newSVsv(sv); /* GMAGIG will be done */
+    RETVAL = SvUTF8(sv) ? TRUE : FALSE;
+    if (RETVAL &&
+        check  &&
+        !is_utf8_string((U8*)SvPVX(sv), SvCUR(sv)))
+        RETVAL = FALSE;
+    if (sv != ST(0))
+    SvREFCNT_dec(sv); /* it was a temp copy */
+}
+OUTPUT:
+    RETVAL
+
+SV *
+_utf8_on(sv)
+SV *	sv
+CODE:
+{
+    if (SvPOK(sv)) {
+    SV *rsv = newSViv(SvUTF8(sv));
+    RETVAL = rsv;
+    SvUTF8_on(sv);
+    } else {
+    RETVAL = &PL_sv_undef;
+    }
+}
+OUTPUT:
+    RETVAL
+
+SV *
+_utf8_off(sv)
+SV *	sv
+CODE:
+{
+    if (SvPOK(sv)) {
+    SV *rsv = newSViv(SvUTF8(sv));
+    RETVAL = rsv;
+    SvUTF8_off(sv);
+    } else {
+    RETVAL = &PL_sv_undef;
+    }
+}
+OUTPUT:
+    RETVAL
+
+int
+DIE_ON_ERR()
+CODE:
+    RETVAL = ENCODE_DIE_ON_ERR;
+OUTPUT:
+    RETVAL
+
+int
+WARN_ON_ERR()
+CODE:
+    RETVAL = ENCODE_WARN_ON_ERR;
+OUTPUT:
+    RETVAL
+
+int
+LEAVE_SRC()
+CODE:
+    RETVAL = ENCODE_LEAVE_SRC;
+OUTPUT:
+    RETVAL
+
+int
+RETURN_ON_ERR()
+CODE:
+    RETVAL = ENCODE_RETURN_ON_ERR;
+OUTPUT:
+    RETVAL
+
+int
+PERLQQ()
+CODE:
+    RETVAL = ENCODE_PERLQQ;
+OUTPUT:
+    RETVAL
+
+int
+HTMLCREF()
+CODE:
+    RETVAL = ENCODE_HTMLCREF;
+OUTPUT:
+    RETVAL
+
+int
+XMLCREF()
+CODE:
+    RETVAL = ENCODE_XMLCREF;
+OUTPUT:
+    RETVAL
+
+int
+STOP_AT_PARTIAL()
+CODE:
+    RETVAL = ENCODE_STOP_AT_PARTIAL;
+OUTPUT:
+    RETVAL
+
+int
+FB_DEFAULT()
+CODE:
+    RETVAL = ENCODE_FB_DEFAULT;
+OUTPUT:
+    RETVAL
+
+int
+FB_CROAK()
+CODE:
+    RETVAL = ENCODE_FB_CROAK;
+OUTPUT:
+    RETVAL
+
+int
+FB_QUIET()
+CODE:
+    RETVAL = ENCODE_FB_QUIET;
+OUTPUT:
+    RETVAL
+
+int
+FB_WARN()
+CODE:
+    RETVAL = ENCODE_FB_WARN;
+OUTPUT:
+    RETVAL
+
+int
+FB_PERLQQ()
+CODE:
+    RETVAL = ENCODE_FB_PERLQQ;
+OUTPUT:
+    RETVAL
+
+int
+FB_HTMLCREF()
+CODE:
+    RETVAL = ENCODE_FB_HTMLCREF;
+OUTPUT:
+    RETVAL
+
+int
+FB_XMLCREF()
+CODE:
+    RETVAL = ENCODE_FB_XMLCREF;
+OUTPUT:
+    RETVAL
+
+BOOT:
+{
+#include "def_t.h"
+#include "def_t.exh"
+}