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#include "converter.h"
#include "utfconverter.h"
#include "uniconv.h"
#include "unicode.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
struct utfconverter {
struct converter base;
};
static int
utf8_encode(struct converter *conv,
const uc_char_t **inbuf,
size_t inleft,
char **outbuf,
size_t outleft)
{
size_t i;
if (!inbuf)
return UNICONV_SUCCESS;
for (i = 0; i < inleft; i++) {
int seqlen = ucs4toutf8(**inbuf, NULL);
if (seqlen < 0)
return UNICONV_EILSEQ;
if (seqlen > outleft)
return UNICONV_E2BIG;
ucs4toutf8(**inbuf, *outbuf);
(*inbuf) += 1;
(*outbuf) += seqlen;
outleft -= seqlen;
}
return UNICONV_SUCCESS;
}
static int
utf8_decode(struct converter *conv,
const char **inbuf,
size_t inleft,
uc_char_t **outbuf,
size_t outleft)
{
while (inleft) {
uc_char_t unichar;
int seqlen = ucs4fromutf8(*inbuf, &unichar, inleft);
if (seqlen == -2)
return UNICONV_EINVAL;
else if (seqlen < 0)
return UNICONV_EILSEQ;
if (!outleft)
return UNICONV_E2BIG;
**outbuf = unichar;
(*outbuf) += 1;
outleft -= 1;
(*inbuf) += seqlen;
inleft -= seqlen;
}
return UNICONV_SUCCESS;
}
static int
utf16_encode(struct converter *conv,
const uc_char_t **inbuf,
size_t inleft,
char **outbuf,
size_t outleft)
{
size_t i;
uc_uint16_t **soutbuf = (uc_uint16_t **)outbuf;
if (!inbuf)
return UNICONV_SUCCESS;
for (i = 0; i < inleft; i++) {
int seqlen = ucs4toutf16(**inbuf, NULL);
if (seqlen < 0)
return UNICONV_EILSEQ;
if (seqlen * sizeof(uc_uint16_t) > outleft)
return UNICONV_E2BIG;
ucs4toutf16(**inbuf, *soutbuf);
(*inbuf) += 1;
(*soutbuf) += seqlen;
outleft -= seqlen;
}
return UNICONV_SUCCESS;
}
static int
utf16_decode(struct converter *conv,
const char **inbuf,
size_t inleft,
uc_char_t **outbuf,
size_t outleft)
{
const uc_uint16_t **sinbuf = (const uc_uint16_t**)inbuf;
while (inleft) {
uc_char_t unichar;
int seqlen = ucs4fromutf16(*sinbuf, &unichar,
inleft / sizeof(uc_uint16_t));
if (seqlen == -2)
return UNICONV_EINVAL;
else if (seqlen < 0)
return UNICONV_EILSEQ;
if (!outleft)
return UNICONV_E2BIG;
**outbuf = unichar;
(*outbuf) += 1;
outleft -= 1;
(*sinbuf) += seqlen;
inleft -= seqlen * sizeof(uc_uint16_t);
}
return UNICONV_SUCCESS;
}
static int
utf32_encode(struct converter *conv,
const uc_char_t **inbuf,
size_t inleft,
char **outbuf,
size_t outleft)
{
if (!inbuf)
return UNICONV_SUCCESS;
if (inleft * sizeof(uc_char_t) > outleft)
return UNICONV_E2BIG;
memcpy(*outbuf, *inbuf, inleft * sizeof(uc_char_t));
(*inbuf) += inleft;
(*outbuf) += inleft * sizeof(uc_char_t);
return UNICONV_SUCCESS;
}
static int
utf32_decode(struct converter *conv,
const char **inbuf,
size_t inleft,
uc_char_t **outbuf,
size_t outleft)
{
if (inleft & 3)
return UNICONV_EINVAL;
if (inleft > outleft)
return UNICONV_E2BIG;
memcpy(*outbuf, *inbuf, inleft);
(*inbuf) += inleft;
(*outbuf) += inleft / sizeof(uc_char_t);
return UNICONV_SUCCESS;
}
static void
utfconverter_close(struct converter *conv)
{
free(conv);
}
struct converter *
utfconverter_open(const char *charset)
{
struct utfconverter *conv;
if (strcmp(charset, "utf_8") && strcmp(charset, "utf_16") &&
strcmp(charset, "utf_32"))
return NULL;
conv = malloc(sizeof(struct utfconverter));
if (!conv)
return NULL;
if (!strcmp(charset, "utf_8")) {
conv->base.encode = utf8_encode;
conv->base.decode = utf8_decode;
} else if (!strcmp(charset, "utf_16")) {
conv->base.encode = utf16_encode;
conv->base.decode = utf16_decode;
} else if (!strcmp(charset, "utf_32")) {
conv->base.encode = utf32_encode;
conv->base.decode = utf32_decode;
}
conv->base.close = utfconverter_close;
conv->base.reset = NULL;
return &conv->base;
}
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