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Diffstat (limited to 'package/libs/libiconv/src/iconv.c')
-rw-r--r--package/libs/libiconv/src/iconv.c440
1 files changed, 440 insertions, 0 deletions
diff --git a/package/libs/libiconv/src/iconv.c b/package/libs/libiconv/src/iconv.c
new file mode 100644
index 0000000000..cb4e947758
--- /dev/null
+++ b/package/libs/libiconv/src/iconv.c
@@ -0,0 +1,440 @@
+#include <iconv.h>
+#include <errno.h>
+#include <wchar.h>
+#include <string.h>
+#include <strings.h>
+#include <stdlib.h>
+#include <limits.h>
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdint.h>
+
+/* builtin charmaps */
+#include "charmaps.h"
+
+/* only 0-7 are valid as dest charset */
+#define UTF_16BE 000
+#define UTF_16LE 001
+#define UTF_32BE 002
+#define UTF_32LE 003
+#define WCHAR_T 004
+#define UTF_8 005
+#define US_ASCII 006
+#define LATIN_1 007
+
+/* additional charsets with algorithmic conversion */
+#define LATIN_9 010
+#define TIS_620 011
+#define JIS_0201 012
+
+/* some programs like php need this */
+int _libiconv_version = _LIBICONV_VERSION;
+
+/* these must match the constants above */
+static const unsigned char charsets[] =
+ "\005" "UTF-8" "\0"
+ "\004" "WCHAR_T" "\0"
+ "\000" "UTF-16BE" "\0"
+ "\001" "UTF-16LE" "\0"
+ "\002" "UTF-32BE" "\0"
+ "\003" "UTF-32LE" "\0"
+ "\006" "ASCII" "\0"
+ "\006" "US-ASCII" "\0"
+ "\007" "ISO-8859-1" "\0"
+ "\007" "LATIN1" "\0"
+ "\010" "ISO-8859-15""\0"
+ "\010" "LATIN9" "\0"
+ "\011" "ISO-8859-11""\0"
+ "\011" "TIS-620" "\0"
+ "\012" "JIS-0201" "\0"
+ "\377";
+
+/* separate identifiers for sbcs/dbcs/etc map type */
+#define UCS2_8BIT 000
+#define UCS3_8BIT 001
+#define EUC 002
+#define EUC_TW 003
+#define SHIFT_JIS 004
+#define BIG5 005
+#define GBK 006
+
+/* FIXME: these are not implemented yet
+// EUC: A1-FE A1-FE
+// GBK: 81-FE 40-7E,80-FE
+// Big5: A1-FE 40-7E,A1-FE
+*/
+
+static const unsigned short maplen[] = {
+ [UCS2_8BIT] = 4+ 2* 128,
+ [UCS3_8BIT] = 4+ 3* 128,
+ [EUC] = 4+ 2* 94*94,
+ [SHIFT_JIS] = 4+ 2* 94*94,
+ [BIG5] = 4+ 2* 94*157,
+ [GBK] = 4+ 2* 126*190,
+ [EUC_TW] = 4+ 2* 2*94*94,
+};
+
+static int find_charmap(const char *name)
+{
+ int i;
+ for (i = 0; i < (sizeof(charmaps) / sizeof(charmaps[0])); i++)
+ if (!strcasecmp(charmaps[i].name, name))
+ return i;
+ return -1;
+}
+
+static int find_charset(const char *name)
+{
+ const unsigned char *s;
+ for (s=charsets; *s<0xff && strcasecmp(s+1, name); s+=strlen(s)+1);
+ return *s;
+}
+
+iconv_t iconv_open(const char *to, const char *from)
+{
+ unsigned f, t;
+ int m;
+
+ if ((t = find_charset(to)) > 8)
+ return -1;
+
+ if ((f = find_charset(from)) < 255)
+ return 0 | (t<<1) | (f<<8);
+
+ if ((m = find_charmap(from)) > -1)
+ return 1 | (t<<1) | (m<<8);
+
+ return -1;
+}
+
+int iconv_close(iconv_t cd)
+{
+ return 0;
+}
+
+static inline wchar_t get_16(const unsigned char *s, int endian)
+{
+ endian &= 1;
+ return s[endian]<<8 | s[endian^1];
+}
+
+static inline void put_16(unsigned char *s, wchar_t c, int endian)
+{
+ endian &= 1;
+ s[endian] = c>>8;
+ s[endian^1] = c;
+}
+
+static inline int utf8enc_wchar(char *outb, wchar_t c)
+{
+ if (c <= 0x7F) {
+ *outb = c;
+ return 1;
+ }
+ else if (c <= 0x7FF) {
+ *outb++ = ((c >> 6) & 0x1F) | 0xC0;
+ *outb++ = ( c & 0x3F) | 0x80;
+ return 2;
+ }
+ else if (c <= 0xFFFF) {
+ *outb++ = ((c >> 12) & 0x0F) | 0xE0;
+ *outb++ = ((c >> 6) & 0x3F) | 0x80;
+ *outb++ = ( c & 0x3F) | 0x80;
+ return 3;
+ }
+ else if (c <= 0x10FFFF) {
+ *outb++ = ((c >> 18) & 0x07) | 0xF0;
+ *outb++ = ((c >> 12) & 0x3F) | 0x80;
+ *outb++ = ((c >> 6) & 0x3F) | 0x80;
+ *outb++ = ( c & 0x3F) | 0x80;
+ return 4;
+ }
+ else {
+ *outb++ = '?';
+ return 1;
+ }
+}
+
+static inline int utf8seq_is_overlong(char *s, int n)
+{
+ switch (n)
+ {
+ case 2:
+ /* 1100000x (10xxxxxx) */
+ return (((*s >> 1) == 0x60) &&
+ ((*(s+1) >> 6) == 0x02));
+
+ case 3:
+ /* 11100000 100xxxxx (10xxxxxx) */
+ return ((*s == 0xE0) &&
+ ((*(s+1) >> 5) == 0x04) &&
+ ((*(s+2) >> 6) == 0x02));
+
+ case 4:
+ /* 11110000 1000xxxx (10xxxxxx 10xxxxxx) */
+ return ((*s == 0xF0) &&
+ ((*(s+1) >> 4) == 0x08) &&
+ ((*(s+2) >> 6) == 0x02) &&
+ ((*(s+3) >> 6) == 0x02));
+ }
+
+ return 0;
+}
+
+static inline int utf8seq_is_surrogate(char *s, int n)
+{
+ return ((n == 3) && (*s == 0xED) && (*(s+1) >= 0xA0) && (*(s+1) <= 0xBF));
+}
+
+static inline int utf8seq_is_illegal(char *s, int n)
+{
+ return ((n == 3) && (*s == 0xEF) && (*(s+1) == 0xBF) &&
+ (*(s+2) >= 0xBE) && (*(s+2) <= 0xBF));
+}
+
+static inline int utf8dec_wchar(wchar_t *c, unsigned char *in, size_t inb)
+{
+ int i;
+ int n = -1;
+
+ /* trivial char */
+ if (*in <= 0x7F) {
+ *c = *in;
+ return 1;
+ }
+
+ /* find utf8 sequence length */
+ if ((*in & 0xE0) == 0xC0) n = 2;
+ else if ((*in & 0xF0) == 0xE0) n = 3;
+ else if ((*in & 0xF8) == 0xF0) n = 4;
+ else if ((*in & 0xFC) == 0xF8) n = 5;
+ else if ((*in & 0xFE) == 0xFC) n = 6;
+
+ /* starved? */
+ if (n > inb)
+ return -2;
+
+ /* decode ... */
+ if (n > 1 && n < 5) {
+ /* reject invalid sequences */
+ if (utf8seq_is_overlong(in, n) ||
+ utf8seq_is_surrogate(in, n) ||
+ utf8seq_is_illegal(in, n))
+ return -1;
+
+ /* decode ... */
+ *c = (char)(*in++ & (0x7F >> n));
+
+ for (i = 1; i < n; i++) {
+ /* illegal continuation byte */
+ if (*in < 0x80 || *in > 0xBF)
+ return -1;
+
+ *c = (*c << 6) | (*in++ & 0x3F);
+ }
+
+ return n;
+ }
+
+ /* unmapped sequence (> 4) */
+ return -1;
+}
+
+static inline char latin9_translit(wchar_t c)
+{
+ /* a number of trivial iso-8859-15 <> utf-8 transliterations */
+ switch (c) {
+ case 0x20AC: return 0xA4; /* Euro */
+ case 0x0160: return 0xA6; /* S caron */
+ case 0x0161: return 0xA8; /* s caron */
+ case 0x017D: return 0xB4; /* Z caron */
+ case 0x017E: return 0xB8; /* z caron */
+ case 0x0152: return 0xBC; /* OE */
+ case 0x0153: return 0xBD; /* oe */
+ case 0x0178: return 0xBE; /* Y diaeresis */
+ default: return '?';
+ }
+}
+
+size_t iconv(iconv_t cd, char **in, size_t *inb, char **out, size_t *outb)
+{
+ size_t x=0;
+ unsigned char to = (cd>>1)&127;
+ unsigned char from = 255;
+ const unsigned char *map = 0;
+ char tmp[MB_LEN_MAX];
+ wchar_t c, d;
+ size_t k, l;
+ int err;
+
+ if (!in || !*in || !*inb) return 0;
+
+ if (cd & 1)
+ map = charmaps[cd>>8].map;
+ else
+ from = cd>>8;
+
+ for (; *inb; *in+=l, *inb-=l) {
+ c = *(unsigned char *)*in;
+ l = 1;
+ if (from >= UTF_8 && c < 0x80) goto charok;
+ switch (from) {
+ case WCHAR_T:
+ l = sizeof(wchar_t);
+ if (*inb < l) goto starved;
+ c = *(wchar_t *)*in;
+ break;
+ case UTF_8:
+ l = utf8dec_wchar(&c, *in, *inb);
+ if (!l) l++;
+ else if (l == (size_t)-1) goto ilseq;
+ else if (l == (size_t)-2) goto starved;
+ break;
+ case US_ASCII:
+ goto ilseq;
+ case LATIN_9:
+ if ((unsigned)c - 0xa4 <= 0xbe - 0xa4) {
+ static const unsigned char map[] = {
+ 0, 0x60, 0, 0x61, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0x7d, 0, 0, 0, 0x7e, 0, 0, 0,
+ 0x52, 0x53, 0x78
+ };
+ if (c == 0xa4) c = 0x20ac;
+ else if (map[c-0xa5]) c = 0x100 | map[c-0xa5];
+ }
+ case LATIN_1:
+ goto charok;
+ case TIS_620:
+ if (c >= 0xa1) c += 0x0e01-0xa1;
+ goto charok;
+ case JIS_0201:
+ if (c >= 0xa1) {
+ if (c <= 0xdf) c += 0xff61-0xa1;
+ else goto ilseq;
+ }
+ goto charok;
+ case UTF_16BE:
+ case UTF_16LE:
+ l = 2;
+ if (*inb < 2) goto starved;
+ c = get_16(*in, from);
+ if ((unsigned)(c-0xdc00) < 0x400) goto ilseq;
+ if ((unsigned)(c-0xd800) < 0x400) {
+ l = 4;
+ if (*inb < 4) goto starved;
+ d = get_16(*in + 2, from);
+ if ((unsigned)(c-0xdc00) >= 0x400) goto ilseq;
+ c = ((c-0xd800)<<10) | (d-0xdc00);
+ }
+ break;
+ case UTF_32BE:
+ case UTF_32LE:
+ l = 4;
+ if (*inb < 4) goto starved;
+ // FIXME
+ // c = get_32(*in, from);
+ break;
+ default:
+ /* only support ascii supersets */
+ if (c < 0x80) break;
+ switch (map[0]) {
+ case UCS2_8BIT:
+ c -= 0x80;
+ break;
+ case EUC:
+ if ((unsigned)c - 0xa1 >= 94) goto ilseq;
+ if ((unsigned)in[0][1] - 0xa1 >= 94) goto ilseq;
+ c = (c-0xa1)*94 + (in[0][1]-0xa1);
+ l = 2;
+ break;
+ case SHIFT_JIS:
+ if ((unsigned)c - 0xa1 <= 0xdf-0xa1) {
+ c += 0xff61-0xa1;
+ goto charok;
+ }
+ // FIXME...
+ l = 2;
+ break;
+ default:
+ goto badf;
+ }
+ c = get_16(map + 4 + 2*c, 0);
+ if (c == 0xffff) goto ilseq;
+ goto charok;
+ }
+
+ if ((unsigned)c - 0xd800 < 0x800 || (unsigned)c >= 0x110000)
+ goto ilseq;
+charok:
+ switch (to) {
+ 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) {
+ k = utf8enc_wchar(tmp, c);
+ if (*outb < k) goto toobig;
+ memcpy(*out, tmp, k);
+ } else k = utf8enc_wchar(*out, c);
+ *out += k;
+ *outb -= k;
+ break;
+ case US_ASCII:
+ if (c > 0x7f) c = 0xfffd;
+ /* fall thru and count replacement in latin1 case */
+ case LATIN_9:
+ if (c >= 0x100 && c != 0xfffd)
+ c = latin9_translit(c);
+ /* fall through */
+ case LATIN_1:
+ if (!*outb) goto toobig;
+ if (c < 0x100) **out = c;
+ else x++, **out = '*'; //FIXME: translit?
+ ++*out;
+ --*outb;
+ break;
+ case UTF_16BE:
+ case UTF_16LE:
+ if (c < 0x10000) {
+ if (*outb < 2) goto toobig;
+ put_16(*out, c, to);
+ *out += 2;
+ *outb -= 2;
+ break;
+ }
+ if (*outb < 4) goto toobig;
+ put_16(*out, (c>>10)|0xd800, to);
+ put_16(*out + 2, (c&0x3ff)|0xdc00, to);
+ *out += 4;
+ *outb -= 4;
+ break;
+ default:
+ goto badf;
+ }
+ }
+ return x;
+ilseq:
+ err = EILSEQ;
+ x = -1;
+ goto end;
+badf:
+ err = EBADF;
+ x = -1;
+ goto end;
+toobig:
+ err = E2BIG;
+ x = -1;
+ goto end;
+starved:
+ err = EINVAL;
+end:
+ errno = err;
+ return x;
+}
generated by cgit v1.2.3 (git 2.46.0) at 2024-12-26 22:07:08 +0000