kolibrios/programs/develop/libraries/iconv/iconv.c
hidnplayr 824c13ffef Iconv: add ISO-8859-1 support. (Second most popular encoding on the web today.)
git-svn-id: svn://kolibrios.org@7085 a494cfbc-eb01-0410-851d-a64ba20cac60
2017-10-10 22:05:43 +00:00

270 lines
7.1 KiB
C

#include <string.h>
#include <stdio.h>
#include <errno.h>
typedef int conv_t;
typedef unsigned int ucs4_t;
typedef int iconv_t;
/* Return code if invalid input after a shift sequence of n bytes was read.
(xxx_mbtowc) */
#define RET_SHIFT_ILSEQ(n) (-1-2*(n))
/* Return code if invalid. (xxx_mbtowc) */
#define RET_ILSEQ RET_SHIFT_ILSEQ(0)
/* Return code if only a shift sequence of n bytes was read. (xxx_mbtowc) */
#define RET_TOOFEW(n) (-2-2*(n))
/* Return code if invalid. (xxx_wctomb) */
#define RET_ILUNI -1
/* Return code if output buffer is too small. (xxx_wctomb, xxx_reset) */
#define RET_TOOSMALL -2
#define CP866 0
#define CP1251 1
#define CP1252 2
#define KOI8_RU 3
#define ISO8859_5 4
#define UTF_8 5
#define KOI8_R 6
#define ISO8859_1 7
#include "cp866.h"
#include "cp1251.h"
#include "cp1252.h"
#include "koi8_r.h"
#include "koi8_ru.h"
#include "iso8859_1.h"
#include "iso8859_5.h"
#include "utf8.h"
int encoding(const char *someencoding) {
char *what = strdup(someencoding);
/* Ignore //TRANSLIT or //IGNORE for now. */
int i;
for(i = 0; i < strlen(what); i++) {
if(what[i] == '/') {
what[i] = '\0';
break;
}
}
if (!strcasecmp(what,"CP866")) return CP866;
if (!strcasecmp(what,"CP1251")) return CP1251;
if (!strcasecmp(what,"windows-1251")) return CP1251;
if (!strcasecmp(what,"CP1252")) return CP1252;
if (!strcasecmp(what,"windows-1252")) return CP1252;
if (!strcasecmp(what,"KOI8-R")) return KOI8_R;
if (!strcasecmp(what,"KOI8-RU")) return KOI8_RU;
if (!strcasecmp(what,"ISO8859-1")) return ISO8859_1;
if (!strcasecmp(what,"ISO8859-5")) return ISO8859_5;
if (!strcasecmp(what,"UTF-8")) return UTF_8;
return -1;
}
iconv_t iconv_open(const char *tocode, const char *fromcode) {
int to, from;
if ((to=encoding(tocode))==-1) return -1;
if ((from=encoding(fromcode))==-1) return -1;
to=to<<16&0xFFFF0000;
from=from&0xFFFF;
return to+from;
}
int iconv_close(iconv_t icd)
{
return 0;
}
size_t iconv(iconv_t cd, const char **inbuf, size_t *inbytesleft,
char **outbuf, size_t *outbytesleft)
{
int n, to, from;
size_t count1,count2;
unsigned int pwc;
int converted,written;
int (*mbtowc)(conv_t, ucs4_t *, const unsigned char *, int);
int (*wctomb)(conv_t, unsigned char *, ucs4_t, int);
to=cd>>16;
from=cd&0xFFFF;
switch (from)
{
case CP866: mbtowc=cp866_mbtowc; break;
case CP1251: mbtowc=cp1251_mbtowc; break;
case CP1252: mbtowc=cp1252_mbtowc; break;
case ISO8859_1: mbtowc=iso8859_1_mbtowc; break;
case ISO8859_5: mbtowc=iso8859_5_mbtowc; break;
case KOI8_R: mbtowc=koi8_r_mbtowc; break;
case KOI8_RU: mbtowc=koi8_ru_mbtowc; break;
case UTF_8: mbtowc=utf8_mbtowc; break;
default: return (size_t)-1;
}
switch (to)
{
case CP866: wctomb=cp866_wctomb; break;
case CP1251: wctomb=cp1251_wctomb; break;
case CP1252: wctomb=cp1252_wctomb; break;
case ISO8859_1: wctomb=iso8859_1_wctomb; break;
case ISO8859_5: wctomb=iso8859_5_wctomb; break;
case KOI8_R: wctomb=koi8_r_wctomb; break;
case KOI8_RU: wctomb=koi8_ru_wctomb; break;
case UTF_8: wctomb=utf8_wctomb; break;
default: return (size_t)-1;
}
count1=0;
count2=0;
/* Convert input multibyte char to wide character by using calls to mbtowc */
/* Convert wide character to multibyte by calls to wctomb */
/* Handle errors as we go on converting to be as standard compliant as possible */
while(count1 < *inbytesleft) {
unsigned char mbholder[] = { 0,0,0,0,0,0 };
int numbytes = (mbtowc)(0, &pwc,((*inbuf)+count1), *inbytesleft - count1);
if(numbytes < 0) {
/* errno = EILSEQ if invalid multibyte sequence encountered in input */
/* errno = EINVAL if input ends in the middle of a multibyte sequence */
switch(numbytes) {
case RET_TOOFEW(0):
errno = EINVAL;
break;
case RET_ILSEQ:
errno = EILSEQ;
break;
}
*inbytesleft -= count1;
*outbytesleft -= count2;
*inbuf += count1;
*outbuf += count2;
return (size_t) -1;
}
/* Convert from wide to multibyte storing result in mbholder and num converted in numbytes2 */
/* Pass the minimum amount of space we have, one from mbholder and one from remaining in outbuf */
int minspace = sizeof(mbholder) <= (*outbytesleft - count2) ? sizeof(mbholder) : (*outbytesleft - count2);
int numbytes2 = (wctomb)(0, &mbholder[0], pwc, minspace);
if(numbytes2 < 0) {
switch(numbytes2) {
case RET_ILUNI:
errno = EILSEQ;
break;
case RET_TOOSMALL:
errno = E2BIG;
break;
}
*inbytesleft -= count1;
*outbytesleft -= count2;
*inbuf += count1;
*outbuf += count2;
return (size_t) -1;
}
int i;
for(i = 0; i < numbytes2; i++) {
*(*outbuf + count2 + i) = mbholder[i];
}
count1+=numbytes;
count2+=numbytes2;
}
/* Successfully converted everything, update the variables and return number of bytes converted */
*inbytesleft -= count1;
*outbytesleft -= count2;
*inbuf += count1;
*outbuf += count2;
return count1;
}
/* int main() */
/* { */
/* char *s;// ="вертолет"; */
/* char *z; */
/* //unsigned int pwc; */
/* iconv_t cd; */
/* size_t in, out; */
/* FILE *infile; */
/* char *fname = "file3.txt"; */
/* size_t testmax = 100; */
/* size_t test = 0; */
/* infile = fopen(fname,"r"); */
/* fseek(infile, 0, SEEK_END); */
/* size_t file_size = ftell(infile); */
/* rewind(infile); */
/* char *buffer = (char*)malloc(file_size * sizeof(char)); */
/* if (buffer == NULL) */
/* { */
/* fclose(infile); */
/* printf("Error allocating %d bytes.\n", file_size * sizeof(char)); */
/* return -1; */
/* } */
/* size_t bytes_read = fread(buffer, sizeof(char), file_size, infile); */
/* if (bytes_read != file_size) */
/* { */
/* /\* printf("Have read only %d bytes of %d.\n", bytes_read, file_size); *\/ */
/* free(buffer); */
/* fclose(infile); */
/* return -1; */
/* } */
/* /\* in=strlen(buffer); *\/ */
/* in = bytes_read; */
/* z=malloc(in+12000); */
/* out=in-1000; */
/* cd=iconv_open("UTF-8","UTF-8"); */
/* // printf("%x\n",cd); */
/* int t; */
/* char *zor = z; */
/* /\* for(t = 0; t < 27400; t++) *\/ */
/* /\* printf("0x%x,", buffer[t]); *\/ */
/* t=iconv(cd, &buffer, &in, &z, &out); */
/* /\* printf("\nResult after iconv(): %d", t); *\/ */
/* /\* for(t = 0; t < 24259; t++) *\/ */
/* /\* printf("%c", zor[t]); *\/ */
/* //for (;s<s+strlen(s);s++) {cp866_mbtowc (0, &pwc, s, 1);printf("%c=%u\n",*s,pwc);} */
/* } */
/* typedef struct */
/* { */
/* char *name; */
/* void *f; */
/* } export_t; */
/* char szStart[] = "START"; */
/* char szVersion[] = "version"; */
/* char sziconv_open[] = "iconv_open"; */
/* char sziconv[] = "iconv"; */
/* export_t EXPORTS[] __asm__("EXPORTS") = */
/* { */
/* { szStart, (void*)0x0 }, */
/* { szVersion, (void*)0x00010001 }, */
/* { sziconv_open, iconv_open }, */
/* { sziconv, iconv }, */
/* { NULL, NULL }, */
/* }; */