mirror of
https://github.com/rkd77/elinks.git
synced 2024-11-04 08:17:17 -05:00
192 lines
3.9 KiB
C
192 lines
3.9 KiB
C
/* Bzip2 encoding (ENCODING_BZIP2) backend */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_BZLIB_H
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#include <bzlib.h> /* Everything needs this after stdio.h */
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#endif
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#include <errno.h>
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#include "elinks.h"
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#include "encoding/bzip2.h"
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#include "encoding/encoding.h"
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#include "util/memory.h"
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#define ELINKS_BZ_BUFFER_LENGTH BZ_MAX_UNUSED
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struct bz2_enc_data {
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bz_stream fbz_stream;
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int fdread;
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int last_read; /* If err after last bzDecompress was BZ_STREAM_END.. */
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unsigned char buf[ELINKS_BZ_BUFFER_LENGTH]; /* must be the last */
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};
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static int
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bzip2_open(struct stream_encoded *stream, int fd)
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{
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struct bz2_enc_data *data = mem_alloc(sizeof(*data));
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int err;
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stream->data = 0;
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if (!data) {
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return -1;
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}
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memset(data, 0, sizeof(struct bz2_enc_data) - ELINKS_BZ_BUFFER_LENGTH);
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data->last_read = 0;
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data->fdread = fd;
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err = BZ2_bzDecompressInit(&data->fbz_stream, 0, 0);
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if (err != BZ_OK) {
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mem_free(data);
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return -1;
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}
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stream->data = data;
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return 0;
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}
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static int
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bzip2_read(struct stream_encoded *stream, unsigned char *buf, int len)
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{
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struct bz2_enc_data *data = (struct bz2_enc_data *) stream->data;
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int err = 0;
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if (!data) return -1;
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assert(len > 0);
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if (data->last_read) return 0;
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data->fbz_stream.avail_out = len;
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data->fbz_stream.next_out = buf;
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do {
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if (data->fbz_stream.avail_in == 0) {
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int l = safe_read(data->fdread, data->buf,
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ELINKS_BZ_BUFFER_LENGTH);
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if (l == -1) {
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if (errno == EAGAIN)
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break;
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else
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return -1; /* I/O error */
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} else if (l == 0) {
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/* EOF. It is error: we wait for more bytes */
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return -1;
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}
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data->fbz_stream.next_in = data->buf;
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data->fbz_stream.avail_in = l;
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}
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err = BZ2_bzDecompress(&data->fbz_stream);
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if (err == BZ_STREAM_END) {
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data->last_read = 1;
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break;
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} else if (err != BZ_OK) {
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return -1;
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}
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} while (data->fbz_stream.avail_out > 0);
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return len - data->fbz_stream.avail_out;
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}
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#ifdef CONFIG_SMALL
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#define BZIP2_SMALL 1
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#else
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#define BZIP2_SMALL 0
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#endif
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static unsigned char *
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bzip2_decode_buffer(unsigned char *data, int len, int *new_len)
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{
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bz_stream stream;
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unsigned char *buffer = NULL;
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int error;
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memset(&stream, 0, sizeof(bz_stream));
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stream.next_in = data;
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stream.avail_in = len;
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if (BZ2_bzDecompressInit(&stream, 0, BZIP2_SMALL) != BZ_OK)
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return NULL;
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do {
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unsigned char *new_buffer;
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size_t size = stream.total_out_lo32 + MAX_STR_LEN;
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/* FIXME: support for 64 bit. real size is
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*
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* (total_in_hi32 << * 32) + total_in_lo32
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*
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* --jonas */
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assertm(!stream.total_out_hi32, "64 bzip2 decoding not supported");
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new_buffer = mem_realloc(buffer, size);
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if (!new_buffer) {
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error = BZ_MEM_ERROR;
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break;
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}
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buffer = new_buffer;
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stream.next_out = buffer + stream.total_out_lo32;
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stream.avail_out = MAX_STR_LEN;
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error = BZ2_bzDecompress(&stream);
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if (error == BZ_STREAM_END) {
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*new_len = stream.total_out_lo32;
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error = BZ_OK;
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break;
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}
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/* Apparently BZ_STREAM_END is not forced when the end of input
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* is reached. At least lindi- reported that it caused a
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* reproducable infinite loop. Maybe it has to do with decoding
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* an incomplete file. */
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} while (error == BZ_OK && stream.avail_in > 0);
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BZ2_bzDecompressEnd(&stream);
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if (error != BZ_OK) {
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if (buffer) mem_free(buffer);
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*new_len = 0;
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return NULL;
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}
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return buffer;
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}
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static void
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bzip2_close(struct stream_encoded *stream)
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{
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struct bz2_enc_data *data = (struct bz2_enc_data *) stream->data;
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if (data) {
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BZ2_bzDecompressEnd(&data->fbz_stream);
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close(data->fdread);
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mem_free(data);
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stream->data = 0;
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}
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}
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static const unsigned char *const bzip2_extensions[] = { ".bz2", ".tbz", NULL };
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const struct decoding_backend bzip2_decoding_backend = {
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"bzip2",
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bzip2_extensions,
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bzip2_open,
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bzip2_read,
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bzip2_decode_buffer,
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bzip2_close,
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};
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