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