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#include <stdio.h>
/*
if you want to build the charset map, add the root directory of
libunicode to the include path and define BUILD_MAP,
then run it as
./a.out > camel-charset-map-private.h
The tables genereated work like this:
An indirect array for each page of unicode character
Each array element has an indirect pointer to one of the bytes of
the generated bitmask.
*/
#ifdef BUILD_MAP
#include "iso/iso8859-2.h"
#include "iso/iso8859-3.h"
#include "iso/iso8859-4.h"
#include "iso/iso8859-5.h"
#include "iso/iso8859-6.h"
#include "iso/iso8859-7.h"
#include "iso/iso8859-8.h"
#include "iso/iso8859-9.h"
#include "iso/iso8859-10.h"
#include "iso/iso8859-13.h"
#include "iso/iso8859-14.h"
#include "iso/iso8859-15.h"
#include "iso/windows-1250.h"
#include "iso/windows-1252.h"
#include "iso/windows-1257.h"
#include "iso/koi8-r.h"
#include "iso/koi8-u.h"
#include "iso/tis620.2533-1.h"
#include "iso/armscii-8.h"
#include "iso/georgian-academy.h"
#include "iso/georgian-ps.h"
#include "msft/cp932.h"
#include "jis/shiftjis.h"
static struct {
unsigned short *table;
char *name;
int type; /* type of table */
unsigned int bit; /* assigned bit */
} tables[] = {
{ iso8859_2_table, "iso-8859-2", 0, 0} ,
{ iso8859_3_table, "iso-8859-3", 0, 0} ,
{ iso8859_4_table, "iso-8859-4", 0, 0},
{ iso8859_5_table, "iso-8859-5", 0, 0},
/* apparently -6 has special digits? */
{ iso8859_6_table, "iso-8859-6", 0, 0},
{ iso8859_7_table, "iso-8859-7", 0, 0},
{ iso8859_8_table, "iso-8859-8", 0, 0},
{ iso8859_9_table, "iso-8859-9", 0, 0},
{ iso8859_10_table, "iso-8859-10", 0, 0},
{ iso8859_13_table, "iso-8859-13", 0, 0},
{ iso8859_14_table, "iso-8859-14", 0, 0},
{ iso8859_15_table, "iso-8859-15", 0, 0},
{ windows_1250_table, "windows-1250", 0, 0},
{ windows_1252_table, "windows-1252", 0, 0},
{ windows_1257_table, "windows-1257", 0, 0},
{ koi8_r_table, "koi8-r", 0, 0},
{ koi8_u_table, "koi8-u", 0, 0},
{ tis_620_table, "tis620.2533-1", 0, 0},
{ armscii_8_table, "armscii-8", 0, 0},
{ georgian_academy_table, "georgian-academy", 0, 0},
{ georgian_ps_table, "georgian-ps", 0, 0},
{ cp932_table, "CP932", 1, 0},
{ sjis_table, "Shift-JIS", 1, 0},
{ 0, 0}
};
unsigned int encoding_map[256 * 256];
static void
add_bigmap(unsigned short **table, int bit)
{
int i;
int j;
for (i=0;i<256;i++) {
unsigned short *tab = table[i];
if (tab) {
for (j=0;j<256;j++) {
if (tab[j])
encoding_map[tab[j]] |= bit;
}
}
}
}
void main(void)
{
int i, j;
unsigned short *tab;
int max, min;
int bit = 0x01;
int k;
int bytes;
#if 0
/* iso-latin-1 (not needed-detected in code) */
for (i=0;i<256;i++) {
encoding_map[i] |= bit;
}
bit <<= 1;
#endif
/* dont count the terminator */
bytes = ((sizeof(tables)/sizeof(tables[0]))+7-1)/8;
/* the other latin charsets */
for (j=0;tables[j].table;j++) {
switch (tables[j].type) {
case 0: /* table from 128-256 */
tab = tables[j].table;
for (i=0;i<128;i++) {
/* 0-127 is the common */
encoding_map[i] |= bit;
encoding_map[tab[i]] |= bit;
}
break;
case 1: /* sparse table */
add_bigmap(tables[j].table, bit);
break;
}
tables[j].bit = bit;
bit <<= 1;
}
printf("/* This file is automatically generated: DO NOT EDIT */\n\n");
for (i=0;i<256;i++) {
/* first, do we need this block? */
for (k=0;k<bytes;k++) {
for (j=0;j<256;j++) {
if ((encoding_map[i*256 + j] & (0xff << (k*8))) != 0)
break;
}
if (j < 256) {
/* yes, dump it */
printf("static unsigned char m%02x%x[256] = {\n\t", i, k);
for (j=0;j<256;j++) {
printf("0x%02x, ", (encoding_map[i*256+j] >> (k*8)) & 0xff );
if (((j+1)&7) == 0 && j<255)
printf("\n\t");
}
printf("\n};\n\n");
}
}
}
printf("struct {\n");
for (k=0;k<bytes;k++) {
printf("\tunsigned char *bits%d;\n", k);
}
printf("} camel_charmap[256] = {\n\t");
for (i=0;i<256;i++) {
/* first, do we need this block? */
printf("{ ");
for (k=0;k<bytes;k++) {
for (j=0;j<256;j++) {
if ((encoding_map[i*256 + j] & (0xff << (k*8))) != 0)
break;
}
if (j < 256) {
printf("m%02x%x, ", i, k);
} else {
printf("0, ");
}
}
printf("}, ");
if (((i+1)&7) == 0 && i<255)
printf("\n\t");
}
printf("\n};\n\n");
printf("struct {\n\tconst char *name;\n\tunsigned int bit;\n} camel_charinfo[] = {\n");
for (j=0;tables[j].table;j++) {
printf("\t{ \"%s\", 0x%04x },\n", tables[j].name, tables[j].bit);
}
printf("};\n\n");
printf("#define charset_mask(x) \\\n");
for (k=0;k<bytes;k++) {
if (k!=0)
printf("\t| ");
else
printf("\t");
printf("(camel_charmap[(x)>>8].bits%d?camel_charmap[(x)>>8].bits%d[(x)&0xff]<<%d:0)", k, k, k*8);
if (k<bytes-1)
printf("\t\\\n");
}
printf("\n\n");
}
#else
#include "camel-charset-map.h"
#include "camel-charset-map-private.h"
#include <unicode.h>
#include <glib.h>
void camel_charset_init(CamelCharset *c)
{
c->mask = ~0;
c->level = 0;
}
void
camel_charset_step(CamelCharset *c, const char *in, int len)
{
register unsigned int mask;
register int level;
const char *inptr = in, *inend = in+len;
mask = c->mask;
level = c->level;
/* check what charset a given string will fit in */
while (inptr < inend) {
unicode_char_t c;
const char *newinptr;
newinptr = unicode_get_utf8(inptr, &c);
if (newinptr == NULL) {
inptr++;
continue;
}
inptr = newinptr;
if (c<=0xffff) {
mask &= charset_mask(c);
if (c>=128 && c<256)
level = MAX(level, 1);
else if (c>=256)
level = MAX(level, 2);
} else {
mask = 0;
level = MAX(level, 2);
}
}
c->mask = mask;
c->level = level;
}
/* gets the best charset from the mask of chars in it */
static const char *
camel_charset_best_mask(unsigned int mask)
{
int i;
for (i=0;i<sizeof(camel_charinfo)/sizeof(camel_charinfo[0]);i++) {
if (camel_charinfo[i].bit & mask)
return camel_charinfo[i].name;
}
return "UTF-8";
}
const char *camel_charset_best_name(CamelCharset *charset)
{
if (charset->level == 1)
return "ISO-8859-1";
else if (charset->level == 2)
return camel_charset_best_mask(charset->mask);
else
return NULL;
}
/* finds the minimum charset for this string NULL means US-ASCII */
const char *
camel_charset_best(const char *in, int len)
{
CamelCharset charset;
camel_charset_init(&charset);
camel_charset_step(&charset, in, len);
return camel_charset_best_name(&charset);
}
#endif /* !BUILD_MAP */
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