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#include <zlib.h>
#include <iconv.h>
#include <errno.h>
#include "decode.h"
#include "msg.h"
const int bufsize = 8*1024;
static Dstr *Decode_null(Decode *dc, const char *inData, int inLen)
{
Dstr *d = dStr_new("");
dStr_append_l(d, inData, inLen);
return d;
}
static void Decode_null_free(Decode *dc)
{
}
static Dstr *Decode_gzip(Decode *dc, const char *inData, int inLen)
{
int rc = Z_OK;
z_stream *zs = (z_stream *)dc->state;
int inputConsumed = 0;
Dstr *output = dStr_new("");
while ((rc == Z_OK) && (inputConsumed < inLen)) {
zs->next_in = (Bytef *)inData + inputConsumed;
zs->avail_in = inLen - inputConsumed;
zs->next_out = (Bytef *)dc->buffer;
zs->avail_out = bufsize;
rc = inflate(zs, Z_SYNC_FLUSH);
if ((rc == Z_OK) || (rc == Z_STREAM_END)) {
// Z_STREAM_END at end of file
inputConsumed += zs->total_in;
dStr_append_l(output, dc->buffer, zs->total_out);
zs->total_out = 0;
zs->total_in = 0;
}
}
return output;
}
static void Decode_gzip_free(Decode *dc)
{
(void)inflateEnd((z_stream *)dc->state);
dFree(dc->buffer);
}
static Dstr *Decode_charset(Decode *dc, const char *inData, int inLen)
{
int rc = 0;
Dstr *input, *output;
char *inPtr, *outPtr;
size_t inLeft, outRoom;
output = dStr_new("");
input = dc->leftover;
dStr_append_l(input, inData, inLen);
inPtr = input->str;
inLeft = input->len;
while ((rc != EINVAL) && (inLeft > 0)) {
outPtr = dc->buffer;
outRoom = bufsize;
rc = iconv((iconv_t)dc->state, &inPtr, &inLeft, &outPtr, &outRoom);
// iconv() on success, number of bytes converted
// -1, errno == EILSEQ illegal byte sequence found
// EINVAL partial character ends source buffer
// E2BIG destination buffer is full
dStr_append_l(output, dc->buffer, bufsize - outRoom);
if (rc == -1)
rc = errno;
if (rc == EILSEQ){
inPtr++;
inLeft--;
/*
* U+FFFD: "used to replace an incoming character whose value is
* unknown or unrepresentable in Unicode."
*/
//dStr_append(output, "\ufffd");
dStr_append_c(output, 0xEF);
dStr_append_c(output, 0xBF);
dStr_append_c(output, 0xBD);
}
}
dc->leftover = input;
dStr_erase(dc->leftover, 0, dc->leftover->len - inLeft);
return output;
}
static void Decode_charset_free(Decode *dc)
{
(void)iconv_close((iconv_t)(dc->state));
dFree(dc->buffer);
dStr_free(dc->leftover, 1);
}
Decode *a_Decode_content_init(const char *format)
{
Decode *dc = (Decode *)dMalloc(sizeof(Decode));
dc->buffer = NULL;
dc->state = NULL;
/* not used */
dc->leftover = NULL;
if (format && !dStrcasecmp(format, "gzip")) {
MSG("compressed data! : %s\n", format);
z_stream *zs;
dc->buffer = (char *)dMalloc(bufsize);
dc->state = zs = (z_stream *)dMalloc(sizeof(z_stream));
zs->zalloc = NULL;
zs->zfree = NULL;
zs->next_in = NULL;
zs->avail_in = 0;
/* 16 is a magic number for gzip decoding */
inflateInit2(zs, MAX_WBITS+16);
dc->decode = Decode_gzip;
dc->free = Decode_gzip_free;
} else {
dc->decode = Decode_null;
dc->free = Decode_null_free;
}
return dc;
}
static int Decode_is_latin1(const char *str)
{
return (!(dStrcasecmp(str, "ISO-8859-1") ||
dStrcasecmp(str, "latin1") ||
dStrcasecmp(str, "ISO_8859-1:1987") ||
dStrcasecmp(str, "ISO_8859-1") ||
dStrcasecmp(str, "iso-ir-100") ||
dStrcasecmp(str, "l1") ||
dStrcasecmp(str, "IBM819") ||
dStrcasecmp(str, "CP819") ||
dStrcasecmp(str, "csISOLatin1")));
}
static int Decode_is_ascii(const char *str)
{
return (!(dStrcasecmp(str, "ASCII") ||
dStrcasecmp(str, "US-ASCII") ||
dStrcasecmp(str, "us") ||
dStrcasecmp(str, "IBM367") ||
dStrcasecmp(str, "cp367") ||
dStrcasecmp(str, "csASCII") ||
dStrcasecmp(str, "ANSI_X3.4-1968") ||
dStrcasecmp(str, "iso-ir-6") ||
dStrcasecmp(str, "ANSI_X3.4-1986") ||
dStrcasecmp(str, "ISO_646.irv:1991") ||
dStrcasecmp(str, "ISO646-US")));
}
Decode *a_Decode_charset_init(const char *format)
{
Decode *dc = (Decode *)dMalloc(sizeof(Decode));
if (format &&
strlen(format) &&
dStrcasecmp(format,"UTF-8") &&
!Decode_is_latin1(format) &&
!Decode_is_ascii(format)) {
iconv_t ic;
dc->state = ic = iconv_open("UTF-8", format);
if (ic != (iconv_t) -1) {
dc->buffer = (char *)dMalloc(bufsize);
dc->leftover = dStr_new("");
dc->decode = Decode_charset;
dc->free = Decode_charset_free;
return dc;
} else {
MSG("Unable to convert from character encoding: '%s'\n", format);
}
}
dc->leftover = NULL;
dc->buffer = NULL;
dc->decode = Decode_null;
dc->free = Decode_null_free;
return dc;
}
Dstr *a_Decode_process(Decode *dc, const char *inData, int inLen)
{
return dc->decode(dc, inData, inLen);
}
void a_Decode_free(Decode *dc)
{
dc->free(dc);
dFree(dc);
}
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