440 lines
9 KiB
C
440 lines
9 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 <strings.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <stdint.h>
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/* builtin charmaps */
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#include "charmaps.h"
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/* only 0-7 are valid as dest charset */
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#define UTF_16BE 000
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#define UTF_16LE 001
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#define UTF_32BE 002
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#define UTF_32LE 003
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#define WCHAR_T 004
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#define UTF_8 005
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#define US_ASCII 006
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#define LATIN_1 007
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/* additional charsets with algorithmic conversion */
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#define LATIN_9 010
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#define TIS_620 011
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#define JIS_0201 012
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/* some programs like php need this */
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int _libiconv_version = _LIBICONV_VERSION;
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/* these must match the constants above */
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static const unsigned char charsets[] =
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"\005" "UTF-8" "\0"
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"\004" "WCHAR_T" "\0"
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"\000" "UTF-16BE" "\0"
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"\001" "UTF-16LE" "\0"
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"\002" "UTF-32BE" "\0"
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"\003" "UTF-32LE" "\0"
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"\006" "ASCII" "\0"
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"\006" "US-ASCII" "\0"
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"\007" "ISO-8859-1" "\0"
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"\007" "LATIN1" "\0"
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"\010" "ISO-8859-15""\0"
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"\010" "LATIN9" "\0"
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"\011" "ISO-8859-11""\0"
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"\011" "TIS-620" "\0"
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"\012" "JIS-0201" "\0"
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"\377";
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/* separate identifiers for sbcs/dbcs/etc map type */
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#define UCS2_8BIT 000
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#define UCS3_8BIT 001
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#define EUC 002
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#define EUC_TW 003
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#define SHIFT_JIS 004
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#define BIG5 005
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#define GBK 006
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/* FIXME: these are not implemented yet
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// EUC: A1-FE A1-FE
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// GBK: 81-FE 40-7E,80-FE
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// Big5: A1-FE 40-7E,A1-FE
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*/
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static const unsigned short maplen[] = {
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[UCS2_8BIT] = 4+ 2* 128,
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[UCS3_8BIT] = 4+ 3* 128,
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[EUC] = 4+ 2* 94*94,
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[SHIFT_JIS] = 4+ 2* 94*94,
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[BIG5] = 4+ 2* 94*157,
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[GBK] = 4+ 2* 126*190,
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[EUC_TW] = 4+ 2* 2*94*94,
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};
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static int find_charmap(const char *name)
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{
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int i;
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for (i = 0; i < (sizeof(charmaps) / sizeof(charmaps[0])); i++)
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if (!strcasecmp(charmaps[i].name, name))
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return i;
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return -1;
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}
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static int find_charset(const char *name)
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{
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const unsigned char *s;
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for (s=charsets; *s<0xff && strcasecmp(s+1, name); s+=strlen(s)+1);
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return *s;
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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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unsigned f, t;
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int m;
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if ((t = find_charset(to)) > 8)
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return -1;
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if ((f = find_charset(from)) < 255)
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return 0 | (t<<1) | (f<<8);
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if ((m = find_charmap(from)) > -1)
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return 1 | (t<<1) | (m<<8);
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return -1;
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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 inline wchar_t get_16(const unsigned char *s, int endian)
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{
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endian &= 1;
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return s[endian]<<8 | s[endian^1];
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}
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static inline void put_16(unsigned char *s, wchar_t c, int endian)
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{
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endian &= 1;
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s[endian] = c>>8;
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s[endian^1] = c;
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}
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static inline int utf8enc_wchar(char *outb, wchar_t c)
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{
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if (c <= 0x7F) {
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*outb = c;
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return 1;
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}
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else if (c <= 0x7FF) {
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*outb++ = ((c >> 6) & 0x1F) | 0xC0;
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*outb++ = ( c & 0x3F) | 0x80;
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return 2;
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}
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else if (c <= 0xFFFF) {
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*outb++ = ((c >> 12) & 0x0F) | 0xE0;
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*outb++ = ((c >> 6) & 0x3F) | 0x80;
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*outb++ = ( c & 0x3F) | 0x80;
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return 3;
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}
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else if (c <= 0x10FFFF) {
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*outb++ = ((c >> 18) & 0x07) | 0xF0;
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*outb++ = ((c >> 12) & 0x3F) | 0x80;
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*outb++ = ((c >> 6) & 0x3F) | 0x80;
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*outb++ = ( c & 0x3F) | 0x80;
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return 4;
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}
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else {
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*outb++ = '?';
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return 1;
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}
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}
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static inline int utf8seq_is_overlong(char *s, int n)
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{
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switch (n)
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{
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case 2:
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/* 1100000x (10xxxxxx) */
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return (((*s >> 1) == 0x60) &&
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((*(s+1) >> 6) == 0x02));
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case 3:
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/* 11100000 100xxxxx (10xxxxxx) */
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return ((*s == 0xE0) &&
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((*(s+1) >> 5) == 0x04) &&
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((*(s+2) >> 6) == 0x02));
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case 4:
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/* 11110000 1000xxxx (10xxxxxx 10xxxxxx) */
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return ((*s == 0xF0) &&
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((*(s+1) >> 4) == 0x08) &&
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((*(s+2) >> 6) == 0x02) &&
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((*(s+3) >> 6) == 0x02));
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}
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return 0;
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}
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static inline int utf8seq_is_surrogate(char *s, int n)
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{
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return ((n == 3) && (*s == 0xED) && (*(s+1) >= 0xA0) && (*(s+1) <= 0xBF));
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}
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static inline int utf8seq_is_illegal(char *s, int n)
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{
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return ((n == 3) && (*s == 0xEF) && (*(s+1) == 0xBF) &&
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(*(s+2) >= 0xBE) && (*(s+2) <= 0xBF));
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}
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static inline int utf8dec_wchar(wchar_t *c, unsigned char *in, size_t inb)
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{
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int i;
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int n = -1;
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/* trivial char */
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if (*in <= 0x7F) {
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*c = *in;
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return 1;
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}
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/* find utf8 sequence length */
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if ((*in & 0xE0) == 0xC0) n = 2;
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else if ((*in & 0xF0) == 0xE0) n = 3;
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else if ((*in & 0xF8) == 0xF0) n = 4;
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else if ((*in & 0xFC) == 0xF8) n = 5;
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else if ((*in & 0xFE) == 0xFC) n = 6;
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/* starved? */
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if (n > inb)
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return -2;
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/* decode ... */
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if (n > 1 && n < 5) {
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/* reject invalid sequences */
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if (utf8seq_is_overlong(in, n) ||
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utf8seq_is_surrogate(in, n) ||
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utf8seq_is_illegal(in, n))
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return -1;
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/* decode ... */
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*c = (char)(*in++ & (0x7F >> n));
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for (i = 1; i < n; i++) {
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/* illegal continuation byte */
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if (*in < 0x80 || *in > 0xBF)
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return -1;
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*c = (*c << 6) | (*in++ & 0x3F);
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}
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return n;
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}
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/* unmapped sequence (> 4) */
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return -1;
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}
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static inline char latin9_translit(wchar_t c)
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{
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/* a number of trivial iso-8859-15 <> utf-8 transliterations */
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switch (c) {
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case 0x20AC: return 0xA4; /* Euro */
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case 0x0160: return 0xA6; /* S caron */
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case 0x0161: return 0xA8; /* s caron */
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case 0x017D: return 0xB4; /* Z caron */
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case 0x017E: return 0xB8; /* z caron */
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case 0x0152: return 0xBC; /* OE */
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case 0x0153: return 0xBD; /* oe */
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case 0x0178: return 0xBE; /* Y diaeresis */
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default: return '?';
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}
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}
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size_t iconv(iconv_t cd, char **in, size_t *inb, char **out, size_t *outb)
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{
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size_t x=0;
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unsigned char to = (cd>>1)&127;
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unsigned char from = 255;
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const unsigned char *map = 0;
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char tmp[MB_LEN_MAX];
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wchar_t c, d;
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size_t k, l;
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int err;
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if (!in || !*in || !*inb) return 0;
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if (cd & 1)
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map = charmaps[cd>>8].map;
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else
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from = cd>>8;
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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 (from >= UTF_8 && c < 0x80) goto charok;
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switch (from) {
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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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break;
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case UTF_8:
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l = utf8dec_wchar(&c, *in, *inb);
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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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break;
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case US_ASCII:
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goto ilseq;
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case LATIN_9:
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if ((unsigned)c - 0xa4 <= 0xbe - 0xa4) {
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static const unsigned char map[] = {
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0, 0x60, 0, 0x61, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0x7d, 0, 0, 0, 0x7e, 0, 0, 0,
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0x52, 0x53, 0x78
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};
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if (c == 0xa4) c = 0x20ac;
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else if (map[c-0xa5]) c = 0x100 | map[c-0xa5];
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}
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case LATIN_1:
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goto charok;
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case TIS_620:
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if (c >= 0xa1) c += 0x0e01-0xa1;
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goto charok;
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case JIS_0201:
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if (c >= 0xa1) {
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if (c <= 0xdf) c += 0xff61-0xa1;
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else goto ilseq;
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}
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goto charok;
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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(*in, from);
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if ((unsigned)(c-0xdc00) < 0x400) goto ilseq;
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if ((unsigned)(c-0xd800) < 0x400) {
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l = 4;
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if (*inb < 4) goto starved;
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d = get_16(*in + 2, from);
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if ((unsigned)(c-0xdc00) >= 0x400) goto ilseq;
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c = ((c-0xd800)<<10) | (d-0xdc00);
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}
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break;
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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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// FIXME
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// c = get_32(*in, from);
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break;
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default:
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/* only support ascii supersets */
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if (c < 0x80) break;
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switch (map[0]) {
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case UCS2_8BIT:
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c -= 0x80;
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break;
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case EUC:
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if ((unsigned)c - 0xa1 >= 94) goto ilseq;
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if ((unsigned)in[0][1] - 0xa1 >= 94) goto ilseq;
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c = (c-0xa1)*94 + (in[0][1]-0xa1);
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l = 2;
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break;
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case SHIFT_JIS:
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if ((unsigned)c - 0xa1 <= 0xdf-0xa1) {
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c += 0xff61-0xa1;
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goto charok;
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}
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// FIXME...
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l = 2;
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break;
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default:
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goto badf;
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}
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c = get_16(map + 4 + 2*c, 0);
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if (c == 0xffff) goto ilseq;
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goto charok;
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}
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if ((unsigned)c - 0xd800 < 0x800 || (unsigned)c >= 0x110000)
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goto ilseq;
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charok:
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switch (to) {
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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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k = utf8enc_wchar(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 = utf8enc_wchar(*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) c = 0xfffd;
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/* fall thru and count replacement in latin1 case */
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case LATIN_9:
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if (c >= 0x100 && c != 0xfffd)
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c = latin9_translit(c);
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/* fall through */
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case LATIN_1:
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if (!*outb) goto toobig;
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if (c < 0x100) **out = c;
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else x++, **out = '*'; //FIXME: translit?
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++*out;
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--*outb;
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break;
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case UTF_16BE:
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case UTF_16LE:
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if (c < 0x10000) {
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if (*outb < 2) goto toobig;
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put_16(*out, c, to);
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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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put_16(*out, (c>>10)|0xd800, to);
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put_16(*out + 2, (c&0x3ff)|0xdc00, to);
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*out += 4;
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*outb -= 4;
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break;
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default:
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goto badf;
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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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badf:
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err = EBADF;
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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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end:
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errno = err;
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return x;
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}
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