46b726eaab
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8184 a1c6a512-1295-4272-9138-f99709370657
313 lines
8.2 KiB
C
313 lines
8.2 KiB
C
/* Some conversion functions for handling UTF-8
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*
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* copyright Marcoen Hirschberg (2004,2005)
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*
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* I got all the info from:
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* http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
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* and
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* http://en.wikipedia.org/wiki/Unicode
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*/
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#include <stdio.h>
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#include "file.h"
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#include "debug.h"
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#include "rbunicode.h"
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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#define NUM_TABLES 5
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#define NUM_CODEPAGES 13
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static int default_codepage = 0;
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static unsigned short codepage_table[MAX_CP_TABLE_SIZE];
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static int loaded_cp_table = 0;
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static const unsigned char utf8comp[6] =
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{
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0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC
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};
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static const char *filename[NUM_TABLES] =
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{
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CODEPAGE_DIR"/iso.cp",
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CODEPAGE_DIR"/932.cp", /* SJIS */
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CODEPAGE_DIR"/936.cp", /* GB2312 */
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CODEPAGE_DIR"/949.cp", /* KSX1001 */
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CODEPAGE_DIR"/950.cp" /* BIG5 */
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};
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static const char cp_2_table[NUM_CODEPAGES] =
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{
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0, 1, 1, 1, 1, 1, 1, 1, 2, 3, 4, 5
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};
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/* Load codepage file into memory */
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int load_cp_table(int cp)
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{
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int i=0;
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int table = cp_2_table[cp];
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int file, tablesize;
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unsigned char tmp[2];
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if (cp == 0 || table == loaded_cp_table)
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return 1;
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file = open(filename[table-1], O_RDONLY|O_BINARY);
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if (file < 0) {
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DEBUGF("Can't open codepage file: %s.cp\n", filename[table-1]);
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return 0;
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}
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tablesize = lseek(file, 0, SEEK_END) / 2;
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lseek(file, 0, SEEK_SET);
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if (tablesize > MAX_CP_TABLE_SIZE) {
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DEBUGF("Invalid codepage file: %s.cp\n", filename[table-1]);
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close(file);
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return 0;
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}
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while (i < tablesize) {
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if (!read(file, tmp, 2)) {
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DEBUGF("Can't read from codepage file: %s.cp\n",
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filename[table-1]);
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loaded_cp_table = 0;
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return 0;
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}
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codepage_table[i++] = (tmp[1] << 8) | tmp[0];
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}
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loaded_cp_table = table;
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close(file);
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return 1;
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}
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/* Encode a UCS value as UTF-8 and return a pointer after this UTF-8 char. */
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unsigned char* utf8encode(unsigned long ucs, unsigned char *utf8)
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{
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int tail = 0;
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if (ucs > 0x7F)
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while (ucs >> (5*tail + 6))
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tail++;
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*utf8++ = (ucs >> (6*tail)) | utf8comp[tail];
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while (tail--)
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*utf8++ = ((ucs >> (6*tail)) & (MASK ^ 0xFF)) | COMP;
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return utf8;
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}
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/* Recode an iso encoded string to UTF-8 */
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unsigned char* iso_decode(const unsigned char *iso, unsigned char *utf8,
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int cp, int count)
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{
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unsigned short ucs, tmp;
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if (cp == -1) /* use default codepage */
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cp = default_codepage;
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if (!load_cp_table(cp)) cp = 0;
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while (count--) {
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if (*iso < 128)
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*utf8++ = *iso++;
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else {
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/* cp tells us which codepage to convert from */
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switch (cp) {
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case 0x01: /* Greek (ISO-8859-7) */
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case 0x02: /* Hebrew (ISO-8859-8) */
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case 0x03: /* Russian (CP1251) */
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case 0x04: /* Thai (ISO-8859-11) */
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case 0x05: /* Arabic (ISO-8859-6) */
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case 0x06: /* Turkish (ISO-8859-9) */
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case 0x07: /* Latin Extended (ISO-8859-2) */
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tmp = ((cp-1)*128) + (*iso++ - 128);
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ucs = codepage_table[tmp];
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break;
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case 0x08: /* Japanese (SJIS) */
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if (*iso > 0xA0 && *iso < 0xE0) {
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tmp = *iso | 0xA100;
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ucs = codepage_table[tmp];
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break;
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}
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case 0x09: /* Simplified Chinese (GB2312) */
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case 0x0A: /* Korean (KSX1001) */
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case 0x0B: /* Traditional Chinese (BIG5) */
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if (count < 1 || !iso[1]) {
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ucs = *iso++;
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break;
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}
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/* we assume all cjk strings are written
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in big endian order */
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tmp = *iso++ << 8;
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tmp |= *iso++;
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tmp -= 0x8000;
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ucs = codepage_table[tmp];
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count--;
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break;
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case 0x0C: /* UTF-8, do nothing */
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default:
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ucs = *iso++;
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break;
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}
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if (ucs == 0) /* unknown char, assume invalid encoding */
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ucs = 0xffff;
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utf8 = utf8encode(ucs, utf8);
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}
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}
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return utf8;
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}
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/* Recode a UTF-16 string with little-endian byte ordering to UTF-8 */
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unsigned char* utf16LEdecode(const unsigned char *utf16, unsigned char *utf8,
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unsigned int count)
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{
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unsigned long ucs;
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while (count != 0) {
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/* Check for a surrogate pair */
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if (utf16[1] >= 0xD8 && utf16[1] < 0xE0) {
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ucs = 0x10000 + ((utf16[0] << 10) | ((utf16[1] - 0xD8) << 18)
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| utf16[2] | ((utf16[3] - 0xDC) << 8));
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utf16 += 4;
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count -= 2;
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} else {
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ucs = (utf16[0] | (utf16[1] << 8));
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utf16 += 2;
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count -= 1;
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}
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utf8 = utf8encode(ucs, utf8);
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}
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return utf8;
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}
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/* Recode a UTF-16 string with big-endian byte ordering to UTF-8 */
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unsigned char* utf16BEdecode(const unsigned char *utf16, unsigned char *utf8,
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unsigned int count)
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{
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unsigned long ucs;
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while (count != 0) {
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if (*utf16 >= 0xD8 && *utf16 < 0xE0) { /* Check for a surrogate pair */
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ucs = 0x10000 + (((utf16[0] - 0xD8) << 18) | (utf16[1] << 10)
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| ((utf16[2] - 0xDC) << 8) | utf16[3]);
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utf16 += 4;
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count -= 2;
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} else {
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ucs = (utf16[0] << 8) | utf16[1];
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utf16 += 2;
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count -= 1;
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}
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utf8 = utf8encode(ucs, utf8);
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}
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return utf8;
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}
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/* Recode any UTF-16 string to UTF-8 */
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unsigned char* utf16decode(const unsigned char *utf16, unsigned char *utf8,
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unsigned int count)
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{
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unsigned long ucs;
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ucs = *(utf16++) << 8;
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ucs |= *(utf16++);
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if (ucs == 0xFEFF) /* Check for BOM */
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return utf16BEdecode(utf16, utf8, count-1);
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else if (ucs == 0xFFFE)
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return utf16LEdecode(utf16, utf8, count-1);
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else { /* ADDME: Should default be LE or BE? */
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utf16 -= 2;
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return utf16BEdecode(utf16, utf8, count);
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}
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}
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/* Return the number of UTF-8 chars in a string */
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unsigned long utf8length(const unsigned char *utf8)
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{
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unsigned long l = 0;
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while (*utf8 != 0)
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if ((*utf8++ & MASK) != COMP)
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l++;
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return l;
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}
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/* Decode 1 UTF-8 char and return a pointer to the next char. */
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const unsigned char* utf8decode(const unsigned char *utf8, unsigned short *ucs)
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{
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unsigned char c = *utf8++;
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unsigned long code;
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int tail = 0;
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if ((c <= 0x7f) || (c >= 0xc2)) {
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/* Start of new character. */
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if (c < 0x80) { /* U-00000000 - U-0000007F, 1 byte */
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code = c;
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} else if (c < 0xe0) { /* U-00000080 - U-000007FF, 2 bytes */
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tail = 1;
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code = c & 0x1f;
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} else if (c < 0xf0) { /* U-00000800 - U-0000FFFF, 3 bytes */
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tail = 2;
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code = c & 0x0f;
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} else if (c < 0xf5) { /* U-00010000 - U-001FFFFF, 4 bytes */
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tail = 3;
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code = c & 0x07;
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} else {
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/* Invalid size. */
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code = 0xffff;
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}
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while (tail-- && ((c = *utf8++) != 0)) {
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if ((c & 0xc0) == 0x80) {
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/* Valid continuation character. */
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code = (code << 6) | (c & 0x3f);
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} else {
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/* Invalid continuation char */
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code = 0xffff;
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utf8--;
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break;
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}
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}
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} else {
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/* Invalid UTF-8 char */
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code = 0xffff;
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}
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/* currently we don't support chars above U-FFFF */
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*ucs = (code < 0x10000) ? code : 0xffff;
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return utf8;
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}
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void set_codepage(int cp)
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{
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default_codepage = cp;
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return;
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}
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/* seek to a given char in a utf8 string and
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return its start position in the string */
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int utf8seek(const unsigned char* utf8, int offset)
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{
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int pos = 0;
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while (offset--) {
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pos++;
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while ((utf8[pos] & MASK) == COMP)
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pos++;
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}
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return pos;
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}
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