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elinks/src/encoding/bzip2.c
Witold Filipczyk cc28da68a7 bzip2: removed unclean my BZ2_bzRead2.
Use the patched bzlib instead. I put the bzip2-pipe.patch
in the contrib directory.
2007-02-24 16:12:31 +02:00

169 lines
3.3 KiB
C

/* Bzip2 encoding (ENCODING_BZIP2) backend */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_BZLIB_H
#include <bzlib.h> /* Everything needs this after stdio.h */
#endif
#include "elinks.h"
#include "encoding/bzip2.h"
#include "encoding/encoding.h"
#include "util/memory.h"
struct bz2_enc_data {
FILE *file;
BZFILE *bzfile;
int last_read; /* If err after last bzRead() was BZ_STREAM_END.. */
};
/* TODO: When it'll be official, use bzdopen() from Yoshioka Tsuneo. --pasky */
static int
bzip2_open(struct stream_encoded *stream, int fd)
{
struct bz2_enc_data *data = mem_alloc(sizeof(*data));
int err;
if (!data) {
return -1;
}
data->last_read = 0;
data->file = fdopen(fd, "rb");
data->bzfile = BZ2_bzReadOpen(&err, data->file, 0, 0, NULL, 0);
if (!data->bzfile) {
mem_free(data);
return -1;
}
stream->data = data;
return 0;
}
static int
bzip2_read(struct stream_encoded *stream, unsigned char *buf, int len)
{
struct bz2_enc_data *data = (struct bz2_enc_data *) stream->data;
int err = 0;
if (data->last_read)
return 0;
clearerr(data->file);
len = BZ2_bzRead(&err, data->bzfile, buf, len);
if (err == BZ_STREAM_END)
data->last_read = 1;
else if (err)
return -1;
return len;
}
static unsigned char *
bzip2_decode(struct stream_encoded *stream, unsigned char *data, int len,
int *new_len)
{
*new_len = len;
return data;
}
#ifdef CONFIG_SMALL
#define BZIP2_SMALL 1
#else
#define BZIP2_SMALL 0
#endif
static unsigned char *
bzip2_decode_buffer(unsigned char *data, int len, int *new_len)
{
bz_stream stream;
unsigned char *buffer = NULL;
int error;
memset(&stream, 0, sizeof(bz_stream));
stream.next_in = data;
stream.avail_in = len;
if (BZ2_bzDecompressInit(&stream, 0, BZIP2_SMALL) != BZ_OK)
return NULL;
do {
unsigned char *new_buffer;
size_t size = stream.total_out_lo32 + MAX_STR_LEN;
/* FIXME: support for 64 bit. real size is
*
* (total_in_hi32 << * 32) + total_in_lo32
*
* --jonas */
assertm(!stream.total_out_hi32, "64 bzip2 decoding not supported");
new_buffer = mem_realloc(buffer, size);
if (!new_buffer) {
error = BZ_MEM_ERROR;
break;
}
buffer = new_buffer;
stream.next_out = buffer + stream.total_out_lo32;
stream.avail_out = MAX_STR_LEN;
error = BZ2_bzDecompress(&stream);
if (error == BZ_STREAM_END) {
*new_len = stream.total_out_lo32;
error = BZ_OK;
break;
}
/* Apparently BZ_STREAM_END is not forced when the end of input
* is reached. At least lindi- reported that it caused a
* reproducable infinite loop. Maybe it has to do with decoding
* an incomplete file. */
} while (error == BZ_OK && stream.avail_in > 0);
BZ2_bzDecompressEnd(&stream);
if (error != BZ_OK) {
if (buffer) mem_free(buffer);
*new_len = 0;
return NULL;
}
return buffer;
}
static void
bzip2_close(struct stream_encoded *stream)
{
struct bz2_enc_data *data = (struct bz2_enc_data *) stream->data;
int err;
BZ2_bzReadClose(&err, data->bzfile);
fclose(data->file);
mem_free(data);
}
static unsigned char *bzip2_extensions[] = { ".bz2", ".tbz", NULL };
struct decoding_backend bzip2_decoding_backend = {
"bzip2",
bzip2_extensions,
bzip2_open,
bzip2_read,
bzip2_decode,
bzip2_decode_buffer,
bzip2_close,
};