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449 lines
9.5 KiB
449 lines
9.5 KiB
#include <iconv.h>
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#include <errno.h>
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#include <wchar.h>
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#include <string.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <stdint.h>
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#define UTF_32BE 0300
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#define UTF_16LE 0301
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#define UTF_16BE 0302
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#define UTF_32LE 0303
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#define UCS2BE 0304
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#define UCS2LE 0305
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#define WCHAR_T 0306
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#define US_ASCII 0307
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#define UTF_8 0310
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#define EUC_JP 0320
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#define SHIFT_JIS 0321
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#define GB18030 0330
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#define GBK 0331
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#define GB2312 0332
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#define BIG5 0340
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#define EUC_KR 0350
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/* Definitions of charmaps. Each charmap consists of:
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* 1. Empty-string-terminated list of null-terminated aliases.
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* 2. Special type code or number of elided entries.
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* 3. Character table (size determined by field 2). */
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static const unsigned char charmaps[] =
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"utf8\0char\0\0\310"
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"wchart\0\0\306"
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"ucs2\0ucs2be\0\0\304"
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"ucs2le\0\0\305"
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"utf16\0utf16be\0\0\302"
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"utf16le\0\0\301"
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"ucs4\0ucs4be\0utf32\0utf32be\0\0\300"
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"ucs4le\0utf32le\0\0\303"
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"ascii\0usascii\0iso646\0iso646us\0\0\307"
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"eucjp\0\0\320"
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"shiftjis\0sjis\0\0\321"
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"gb18030\0\0\330"
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"gbk\0\0\331"
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"gb2312\0\0\332"
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"big5\0bigfive\0cp950\0big5hkscs\0\0\340"
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"euckr\0ksc5601\0ksx1001\0cp949\0\0\350"
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#include "codepages.h"
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;
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static const unsigned short legacy_chars[] = {
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#include "legacychars.h"
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};
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static const unsigned short jis0208[84][94] = {
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#include "jis0208.h"
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};
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static const unsigned short gb18030[126][190] = {
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#include "gb18030.h"
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};
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static const unsigned short big5[89][157] = {
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#include "big5.h"
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};
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static const unsigned short hkscs[] = {
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#include "hkscs.h"
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};
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static const unsigned short ksc[93][94] = {
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#include "ksc.h"
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};
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static int fuzzycmp(const unsigned char *a, const unsigned char *b)
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{
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for (; *a && *b; a++, b++) {
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while (*a && (*a|32U)-'a'>26 && *a-'0'>10U) a++;
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if ((*a|32U) != *b) return 1;
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}
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return *a != *b;
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}
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static size_t find_charmap(const void *name)
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{
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const unsigned char *s;
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if (!*(char *)name) name=charmaps; /* "utf8" */
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for (s=charmaps; *s; ) {
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if (!fuzzycmp(name, s)) {
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for (; *s; s+=strlen((void *)s)+1);
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return s+1-charmaps;
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}
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s += strlen((void *)s)+1;
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if (!*s) {
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if (s[1] > 0200) s+=2;
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else s+=2+(128U-s[1])/4*5;
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}
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}
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return -1;
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}
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iconv_t iconv_open(const char *to, const char *from)
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{
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size_t f, t;
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if ((t = find_charmap(to))==-1
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|| (f = find_charmap(from))==-1
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|| (charmaps[t] >= 0320)) {
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errno = EINVAL;
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return (iconv_t)-1;
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}
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return (void *)(f<<16 | t);
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}
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int iconv_close(iconv_t cd)
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{
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return 0;
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}
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static unsigned get_16(const unsigned char *s, int e)
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{
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e &= 1;
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return s[e]<<8 | s[1-e];
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}
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static void put_16(unsigned char *s, unsigned c, int e)
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{
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e &= 1;
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s[e] = c>>8;
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s[1-e] = c;
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}
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static unsigned get_32(const unsigned char *s, int e)
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{
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e &= 3;
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return s[e]+0U<<24 | s[e^1]<<16 | s[e^2]<<8 | s[e^3];
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}
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static void put_32(unsigned char *s, unsigned c, int e)
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{
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e &= 3;
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s[e^0] = c>>24;
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s[e^1] = c>>16;
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s[e^2] = c>>8;
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s[e^3] = c;
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}
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/* Adapt as needed */
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#define mbrtowc_utf8 mbrtowc
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#define wctomb_utf8 wctomb
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size_t iconv(iconv_t cd0, char **restrict in, size_t *restrict inb, char **restrict out, size_t *restrict outb)
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{
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size_t x=0;
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unsigned long cd = (unsigned long)cd0;
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unsigned to = cd & 0xffff;
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unsigned from = cd >> 16;
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const unsigned char *map = charmaps+from+1;
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const unsigned char *tomap = charmaps+to+1;
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mbstate_t st = {0};
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wchar_t wc;
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unsigned c, d;
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size_t k, l;
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int err;
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unsigned char type = map[-1];
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unsigned char totype = tomap[-1];
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if (!in || !*in || !*inb) return 0;
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for (; *inb; *in+=l, *inb-=l) {
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c = *(unsigned char *)*in;
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l = 1;
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if (c >= 128 || type-UTF_32BE < 7U) switch (type) {
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case UTF_8:
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l = mbrtowc_utf8(&wc, *in, *inb, &st);
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if (!l) l++;
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else if (l == (size_t)-1) goto ilseq;
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else if (l == (size_t)-2) goto starved;
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c = wc;
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break;
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case US_ASCII:
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goto ilseq;
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case WCHAR_T:
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l = sizeof(wchar_t);
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if (*inb < l) goto starved;
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c = *(wchar_t *)*in;
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if (0) {
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case UTF_32BE:
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case UTF_32LE:
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l = 4;
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if (*inb < 4) goto starved;
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c = get_32((void *)*in, type);
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}
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if (c-0xd800u < 0x800u || c >= 0x110000u) goto ilseq;
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break;
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case UCS2BE:
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case UCS2LE:
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case UTF_16BE:
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case UTF_16LE:
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l = 2;
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if (*inb < 2) goto starved;
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c = get_16((void *)*in, type);
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if ((unsigned)(c-0xdc00) < 0x400) goto ilseq;
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if ((unsigned)(c-0xd800) < 0x400) {
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if (type-UCS2BE < 2U) goto ilseq;
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l = 4;
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if (*inb < 4) goto starved;
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d = get_16((void *)(*in + 2), type);
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if ((unsigned)(d-0xdc00) >= 0x400) goto ilseq;
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c = ((c-0xd7c0)<<10) + (d-0xdc00);
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}
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break;
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case SHIFT_JIS:
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if (c-0xa1 <= 0xdf-0xa1) {
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c += 0xff61-0xa1;
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break;
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}
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l = 2;
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if (*inb < 2) goto starved;
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d = *((unsigned char *)*in + 1);
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if (c-129 <= 159-129) c -= 129;
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else if (c-224 <= 239-224) c -= 193;
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else goto ilseq;
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c *= 2;
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if (d-64 <= 158-64) {
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if (d==127) goto ilseq;
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if (d>127) d--;
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d -= 64;
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} else if (d-159 <= 252-159) {
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c++;
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d -= 159;
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}
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c = jis0208[c][d];
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if (!c) goto ilseq;
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break;
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case EUC_JP:
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l = 2;
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if (*inb < 2) goto starved;
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d = *((unsigned char *)*in + 1);
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if (c==0x8e) {
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c = d;
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if (c-0xa1 > 0xdf-0xa1) goto ilseq;
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c += 0xff61 - 0xa1;
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break;
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}
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c -= 0xa1;
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d -= 0xa1;
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if (c >= 84 || d >= 94) goto ilseq;
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c = jis0208[c][d];
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if (!c) goto ilseq;
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break;
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case GB2312:
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if (c < 0xa1) goto ilseq;
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case GBK:
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case GB18030:
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c -= 0x81;
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if (c >= 126) goto ilseq;
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l = 2;
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if (*inb < 2) goto starved;
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d = *((unsigned char *)*in + 1);
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if (d < 0xa1 && type == GB2312) goto ilseq;
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if (d-0x40>=191 || d==127) {
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if (d-'0'>9 || type != GB18030)
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goto ilseq;
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l = 4;
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if (*inb < 4) goto starved;
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c = (10*c + d-'0') * 1260;
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d = *((unsigned char *)*in + 2);
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if (d-0x81>126) goto ilseq;
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c += 10*(d-0x81);
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d = *((unsigned char *)*in + 3);
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if (d-'0'>9) goto ilseq;
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c += d-'0';
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c += 128;
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for (d=0; d<=c; ) {
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k = 0;
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for (int i=0; i<126; i++)
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for (int j=0; j<190; j++)
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if (gb18030[i][j]-d <= c-d)
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k++;
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d = c+1;
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c += k;
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}
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break;
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}
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d -= 0x40;
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if (d>63) d--;
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c = gb18030[c][d];
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break;
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case BIG5:
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l = 2;
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if (*inb < 2) goto starved;
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d = *((unsigned char *)*in + 1);
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if (d-0x40>=0xff-0x40 || d-0x7f<0xa1-0x7f) goto ilseq;
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d -= 0x40;
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if (d > 0x3e) d -= 0x22;
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if (c-0xa1>=0xfa-0xa1) {
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if (c-0x87>=0xff-0x87) goto ilseq;
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if (c < 0xa1) c -= 0x87;
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else c -= 0x87 + (0xfa-0xa1);
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c = (hkscs[4867+(c*157+d)/16]>>(c*157+d)%16)%2<<17
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| hkscs[c*157+d];
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/* A few HKSCS characters map to pairs of UCS
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* characters. These are mapped to surrogate
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* range in the hkscs table then hard-coded
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* here. Ugly, yes. */
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if (c/256 == 0xdc) {
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if (totype-0300U > 8) k = 2;
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else k = "\10\4\4\10\4\4\10\2\4"[totype-0300];
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if (k > *outb) goto toobig;
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x += iconv((iconv_t)(uintptr_t)to,
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&(char *){"\303\212\314\204"
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"\303\212\314\214"
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"\303\252\314\204"
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"\303\252\314\214"
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+c%256}, &(size_t){4},
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out, outb);
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continue;
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}
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if (!c) goto ilseq;
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break;
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}
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c -= 0xa1;
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c = big5[c][d]|(c==0x27&&(d==0x3a||d==0x3c||d==0x42))<<17;
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if (!c) goto ilseq;
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break;
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case EUC_KR:
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l = 2;
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if (*inb < 2) goto starved;
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d = *((unsigned char *)*in + 1);
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c -= 0xa1;
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d -= 0xa1;
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if (c >= 93 || d >= 94) {
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c += (0xa1-0x81);
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d += 0xa1;
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if (c >= 93 || c>=0xc6-0x81 && d>0x52)
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goto ilseq;
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if (d-'A'<26) d = d-'A';
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else if (d-'a'<26) d = d-'a'+26;
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else if (d-0x81<0xff-0x81) d = d-0x81+52;
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else goto ilseq;
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if (c < 0x20) c = 178*c + d;
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else c = 178*0x20 + 84*(c-0x20) + d;
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c += 0xac00;
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for (d=0xac00; d<=c; ) {
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k = 0;
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for (int i=0; i<93; i++)
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for (int j=0; j<94; j++)
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if (ksc[i][j]-d <= c-d)
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k++;
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d = c+1;
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c += k;
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}
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break;
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}
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c = ksc[c][d];
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if (!c) goto ilseq;
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break;
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default:
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if (c < 128+type) break;
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c -= 128+type;
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c = legacy_chars[ map[c*5/4]>>2*c%8 |
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map[c*5/4+1]<<8-2*c%8 & 1023 ];
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if (!c) c = *(unsigned char *)*in;
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if (c==1) goto ilseq;
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}
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switch (totype) {
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case WCHAR_T:
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if (*outb < sizeof(wchar_t)) goto toobig;
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*(wchar_t *)*out = c;
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*out += sizeof(wchar_t);
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*outb -= sizeof(wchar_t);
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break;
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case UTF_8:
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if (*outb < 4) {
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char tmp[4];
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k = wctomb_utf8(tmp, c);
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if (*outb < k) goto toobig;
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memcpy(*out, tmp, k);
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} else k = wctomb_utf8(*out, c);
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*out += k;
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*outb -= k;
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break;
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case US_ASCII:
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if (c > 0x7f) subst: x++, c='*';
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default:
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if (*outb < 1) goto toobig;
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if (c < 128+totype) {
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revout:
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*(*out)++ = c;
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*outb -= 1;
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break;
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}
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d = c;
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for (c=0; c<128-totype; c++) {
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if (d == legacy_chars[ tomap[c*5/4]>>2*c%8 |
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tomap[c*5/4+1]<<8-2*c%8 & 1023 ]) {
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c += 128;
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goto revout;
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}
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}
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goto subst;
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case UCS2BE:
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case UCS2LE:
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case UTF_16BE:
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case UTF_16LE:
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if (c < 0x10000 || type-UCS2BE < 2U) {
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if (c >= 0x10000) c = 0xFFFD;
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if (*outb < 2) goto toobig;
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put_16((void *)*out, c, totype);
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*out += 2;
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*outb -= 2;
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break;
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}
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if (*outb < 4) goto toobig;
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c -= 0x10000;
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put_16((void *)*out, (c>>10)|0xd800, totype);
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put_16((void *)(*out + 2), (c&0x3ff)|0xdc00, totype);
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*out += 4;
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*outb -= 4;
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break;
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case UTF_32BE:
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case UTF_32LE:
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if (*outb < 4) goto toobig;
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put_32((void *)*out, c, totype);
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*out += 4;
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*outb -= 4;
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break;
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}
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}
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return x;
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ilseq:
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err = EILSEQ;
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x = -1;
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goto end;
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toobig:
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err = E2BIG;
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x = -1;
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goto end;
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starved:
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err = EINVAL;
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x = -1;
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end:
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errno = err;
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return x;
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}
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