mirror of
git://git.musl-libc.org/musl
synced 2025-03-06 20:48:29 +01:00
c47ad25ea3
the UTF-8 output code was written assuming an invariant that iconv's decoders only emit valid Unicode Scalar Values which wctomb can encode successfully, thereby always returning a value between 1 and 4. if this invariant is not satisfied, wctomb returns (size_t)-1, and the subsequent adjustments to the output buffer pointer and remaining output byte count overflow, moving the output position backwards, potentially past the beginning of the buffer, without storing any bytes.
696 lines
15 KiB
C
696 lines
15 KiB
C
#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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#include "locale_impl.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 UTF_16 0312
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#define UTF_32 0313
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#define UCS2 0314
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#define EUC_JP 0320
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#define SHIFT_JIS 0321
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#define ISO2022_JP 0322
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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 quads of entries.
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* 3. Character table (size determined by field 2), consisting
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* of 5 bytes for every 4 characters, interpreted as 10-bit
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* indices into the legacy_chars table. */
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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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"ucs2be\0\0\304"
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"ucs2le\0\0\305"
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"utf16be\0\0\302"
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"utf16le\0\0\301"
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"ucs4be\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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"utf16\0\0\312"
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"ucs4\0utf32\0\0\313"
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"ucs2\0\0\314"
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"eucjp\0\0\320"
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"shiftjis\0sjis\0cp932\0\0\321"
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"iso2022jp\0\0\322"
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"gb18030\0\0\330"
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"gbk\0cp936\0windows936\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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/* Table of characters that appear in legacy 8-bit codepages,
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* limited to 1024 slots (10 bit indices). The first 256 entries
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* are elided since those characters are obviously all included. */
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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 const unsigned short rev_jis[] = {
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#include "revjis.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+(64U-s[1])*5;
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}
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}
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return -1;
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}
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struct stateful_cd {
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iconv_t base_cd;
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unsigned state;
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};
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static iconv_t combine_to_from(size_t t, size_t f)
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{
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return (void *)(f<<16 | t<<1 | 1);
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}
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static size_t extract_from(iconv_t cd)
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{
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return (size_t)cd >> 16;
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}
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static size_t extract_to(iconv_t cd)
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{
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return (size_t)cd >> 1 & 0x7fff;
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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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struct stateful_cd *scd;
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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] >= 0330)) {
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errno = EINVAL;
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return (iconv_t)-1;
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}
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iconv_t cd = combine_to_from(t, f);
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switch (charmaps[f]) {
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case UTF_16:
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case UTF_32:
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case UCS2:
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case ISO2022_JP:
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scd = malloc(sizeof *scd);
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if (!scd) return (iconv_t)-1;
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scd->base_cd = cd;
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scd->state = 0;
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cd = (iconv_t)scd;
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}
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return cd;
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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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static unsigned legacy_map(const unsigned char *map, unsigned c)
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{
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if (c < 4*map[-1]) return c;
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unsigned x = c - 4*map[-1];
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x = map[x*5/4]>>2*x%8 | map[x*5/4+1]<<8-2*x%8 & 1023;
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return x < 256 ? x : legacy_chars[x-256];
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}
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static unsigned uni_to_jis(unsigned c)
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{
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unsigned nel = sizeof rev_jis / sizeof *rev_jis;
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unsigned d, j, i, b = 0;
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for (;;) {
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i = nel/2;
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j = rev_jis[b+i];
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d = jis0208[j/256][j%256];
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if (d==c) return j + 0x2121;
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else if (nel == 1) return 0;
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else if (c < d)
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nel /= 2;
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else {
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b += i;
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nel -= nel/2;
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}
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}
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}
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size_t iconv(iconv_t cd, 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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struct stateful_cd *scd=0;
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if (!((size_t)cd & 1)) {
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scd = (void *)cd;
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cd = scd->base_cd;
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}
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unsigned to = extract_to(cd);
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unsigned from = extract_from(cd);
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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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locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
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if (!in || !*in || !*inb) return 0;
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*ploc = UTF8_LOCALE;
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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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switch (type) {
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case UTF_8:
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if (c < 128) break;
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l = mbrtowc_utf8(&wc, *in, *inb, &st);
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if (l == (size_t)-1) goto ilseq;
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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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if (c >= 128) goto ilseq;
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break;
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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 UCS2:
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case UTF_16:
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l = 0;
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if (!scd->state) {
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if (*inb < 2) goto starved;
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c = get_16((void *)*in, 0);
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scd->state = type==UCS2
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? c==0xfffe ? UCS2LE : UCS2BE
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: c==0xfffe ? UTF_16LE : UTF_16BE;
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if (c == 0xfffe || c == 0xfeff)
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l = 2;
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}
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type = scd->state;
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continue;
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case UTF_32:
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l = 0;
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if (!scd->state) {
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if (*inb < 4) goto starved;
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c = get_32((void *)*in, 0);
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scd->state = c==0xfffe0000 ? UTF_32LE : UTF_32BE;
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if (c == 0xfffe0000 || c == 0xfeff)
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l = 4;
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}
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type = scd->state;
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continue;
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case SHIFT_JIS:
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if (c < 128) break;
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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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} else {
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goto ilseq;
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}
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if (c>=84) 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 EUC_JP:
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if (c < 128) break;
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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 ISO2022_JP:
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if (c >= 128) goto ilseq;
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if (c == '\033') {
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l = 3;
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if (*inb < 3) goto starved;
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c = *((unsigned char *)*in + 1);
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d = *((unsigned char *)*in + 2);
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if (c != '(' && c != '$') goto ilseq;
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switch (128*(c=='$') + d) {
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case 'B': scd->state=0; continue;
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case 'J': scd->state=1; continue;
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case 'I': scd->state=4; continue;
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case 128+'@': scd->state=2; continue;
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case 128+'B': scd->state=3; continue;
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}
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goto ilseq;
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}
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switch (scd->state) {
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case 1:
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if (c=='\\') c = 0xa5;
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if (c=='~') c = 0x203e;
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break;
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case 2:
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case 3:
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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 -= 0x21;
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d -= 0x21;
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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 4:
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if (c-0x60 < 0x1f) goto ilseq;
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if (c-0x21 < 0x5e) c += 0xff61-0x21;
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break;
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}
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break;
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case GB2312:
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if (c < 128) break;
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if (c < 0xa1) goto ilseq;
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case GBK:
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if (c == 128) {
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c = 0x20ac;
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break;
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}
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case GB18030:
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if (c < 128) break;
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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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if (c < 128) break;
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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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union {
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char c[8];
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wchar_t wc[2];
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} tmp;
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char *ptmp = tmp.c;
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size_t tmpx = iconv(combine_to_from(to, find_charmap("utf8")),
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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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&ptmp, &(size_t){sizeof tmp});
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size_t tmplen = ptmp - tmp.c;
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if (tmplen > *outb) goto toobig;
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if (tmpx) x++;
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memcpy(*out, &tmp, tmplen);
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*out += tmplen;
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*outb -= tmplen;
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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;
|
|
c = big5[c][d]|(c==0x27&&(d==0x3a||d==0x3c||d==0x42))<<17;
|
|
if (!c) goto ilseq;
|
|
break;
|
|
case EUC_KR:
|
|
if (c < 128) break;
|
|
l = 2;
|
|
if (*inb < 2) goto starved;
|
|
d = *((unsigned char *)*in + 1);
|
|
c -= 0xa1;
|
|
d -= 0xa1;
|
|
if (c >= 93 || d >= 94) {
|
|
c += (0xa1-0x81);
|
|
d += 0xa1;
|
|
if (c > 0xc6-0x81 || c==0xc6-0x81 && d>0x52)
|
|
goto ilseq;
|
|
if (d-'A'<26) d = d-'A';
|
|
else if (d-'a'<26) d = d-'a'+26;
|
|
else if (d-0x81<0xff-0x81) d = d-0x81+52;
|
|
else goto ilseq;
|
|
if (c < 0x20) c = 178*c + d;
|
|
else c = 178*0x20 + 84*(c-0x20) + d;
|
|
c += 0xac00;
|
|
for (d=0xac00; d<=c; ) {
|
|
k = 0;
|
|
for (int i=0; i<93; i++)
|
|
for (int j=0; j<94; j++)
|
|
if (ksc[i][j]-d <= c-d)
|
|
k++;
|
|
d = c+1;
|
|
c += k;
|
|
}
|
|
break;
|
|
}
|
|
c = ksc[c][d];
|
|
if (!c) goto ilseq;
|
|
break;
|
|
default:
|
|
if (!c) break;
|
|
c = legacy_map(map, c);
|
|
if (!c) goto ilseq;
|
|
}
|
|
|
|
switch (totype) {
|
|
case WCHAR_T:
|
|
if (*outb < sizeof(wchar_t)) goto toobig;
|
|
*(wchar_t *)*out = c;
|
|
*out += sizeof(wchar_t);
|
|
*outb -= sizeof(wchar_t);
|
|
break;
|
|
case UTF_8:
|
|
if (*outb < 4) {
|
|
char tmp[4];
|
|
k = wctomb_utf8(tmp, c);
|
|
if (*outb < k) goto toobig;
|
|
memcpy(*out, tmp, k);
|
|
} else k = wctomb_utf8(*out, c);
|
|
/* This failure condition should be unreachable, but
|
|
* is included to prevent decoder bugs from translating
|
|
* into advancement outside the output buffer range. */
|
|
if (k>4) goto ilseq;
|
|
*out += k;
|
|
*outb -= k;
|
|
break;
|
|
case US_ASCII:
|
|
if (c > 0x7f) subst: x++, c='*';
|
|
default:
|
|
if (*outb < 1) goto toobig;
|
|
if (c<256 && c==legacy_map(tomap, c)) {
|
|
revout:
|
|
if (*outb < 1) goto toobig;
|
|
*(*out)++ = c;
|
|
*outb -= 1;
|
|
break;
|
|
}
|
|
d = c;
|
|
for (c=4*totype; c<256; c++) {
|
|
if (d == legacy_map(tomap, c)) {
|
|
goto revout;
|
|
}
|
|
}
|
|
goto subst;
|
|
case SHIFT_JIS:
|
|
if (c < 128) goto revout;
|
|
if (c == 0xa5) {
|
|
x++;
|
|
c = '\\';
|
|
goto revout;
|
|
}
|
|
if (c == 0x203e) {
|
|
x++;
|
|
c = '~';
|
|
goto revout;
|
|
}
|
|
if (c-0xff61 <= 0xdf-0xa1) {
|
|
c += 0xa1 - 0xff61;
|
|
goto revout;
|
|
}
|
|
c = uni_to_jis(c);
|
|
if (!c) goto subst;
|
|
if (*outb < 2) goto toobig;
|
|
d = c%256;
|
|
c = c/256;
|
|
*(*out)++ = (c+1)/2 + (c<95 ? 112 : 176);
|
|
*(*out)++ = c%2 ? d + 31 + d/96 : d + 126;
|
|
*outb -= 2;
|
|
break;
|
|
case EUC_JP:
|
|
if (c < 128) goto revout;
|
|
if (c-0xff61 <= 0xdf-0xa1) {
|
|
c += 0x0e00 + 0x21 - 0xff61;
|
|
} else {
|
|
c = uni_to_jis(c);
|
|
}
|
|
if (!c) goto subst;
|
|
if (*outb < 2) goto toobig;
|
|
*(*out)++ = c/256 + 0x80;
|
|
*(*out)++ = c%256 + 0x80;
|
|
*outb -= 2;
|
|
break;
|
|
case ISO2022_JP:
|
|
if (c < 128) goto revout;
|
|
if (c-0xff61 <= 0xdf-0xa1 || c==0xa5 || c==0x203e) {
|
|
if (*outb < 7) goto toobig;
|
|
*(*out)++ = '\033';
|
|
*(*out)++ = '(';
|
|
if (c==0xa5) {
|
|
*(*out)++ = 'J';
|
|
*(*out)++ = '\\';
|
|
} else if (c==0x203e) {
|
|
*(*out)++ = 'J';
|
|
*(*out)++ = '~';
|
|
} else {
|
|
*(*out)++ = 'I';
|
|
*(*out)++ = c-0xff61+0x21;
|
|
}
|
|
*(*out)++ = '\033';
|
|
*(*out)++ = '(';
|
|
*(*out)++ = 'B';
|
|
*outb -= 7;
|
|
break;
|
|
}
|
|
c = uni_to_jis(c);
|
|
if (!c) goto subst;
|
|
if (*outb < 8) goto toobig;
|
|
*(*out)++ = '\033';
|
|
*(*out)++ = '$';
|
|
*(*out)++ = 'B';
|
|
*(*out)++ = c/256;
|
|
*(*out)++ = c%256;
|
|
*(*out)++ = '\033';
|
|
*(*out)++ = '(';
|
|
*(*out)++ = 'B';
|
|
*outb -= 8;
|
|
break;
|
|
case UCS2:
|
|
totype = UCS2BE;
|
|
case UCS2BE:
|
|
case UCS2LE:
|
|
case UTF_16:
|
|
case UTF_16BE:
|
|
case UTF_16LE:
|
|
if (c < 0x10000 || totype-UCS2BE < 2U) {
|
|
if (c >= 0x10000) c = 0xFFFD;
|
|
if (*outb < 2) goto toobig;
|
|
put_16((void *)*out, c, totype);
|
|
*out += 2;
|
|
*outb -= 2;
|
|
break;
|
|
}
|
|
if (*outb < 4) goto toobig;
|
|
c -= 0x10000;
|
|
put_16((void *)*out, (c>>10)|0xd800, totype);
|
|
put_16((void *)(*out + 2), (c&0x3ff)|0xdc00, totype);
|
|
*out += 4;
|
|
*outb -= 4;
|
|
break;
|
|
case UTF_32:
|
|
totype = UTF_32BE;
|
|
case UTF_32BE:
|
|
case UTF_32LE:
|
|
if (*outb < 4) goto toobig;
|
|
put_32((void *)*out, c, totype);
|
|
*out += 4;
|
|
*outb -= 4;
|
|
break;
|
|
}
|
|
}
|
|
*ploc = loc;
|
|
return x;
|
|
ilseq:
|
|
err = EILSEQ;
|
|
x = -1;
|
|
goto end;
|
|
toobig:
|
|
err = E2BIG;
|
|
x = -1;
|
|
goto end;
|
|
starved:
|
|
err = EINVAL;
|
|
x = -1;
|
|
end:
|
|
errno = err;
|
|
*ploc = loc;
|
|
return x;
|
|
}
|