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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* bzip2.c
*
* Copyright (C) 2021 David Oberhollenzer <goliath@infraroot.at>
*/
#include <stdlib.h>
#include <stdio.h>
#include <bzlib.h>
#include "xfrm/stream.h"
#include "xfrm/compress.h"
typedef struct {
xfrm_stream_t base;
bz_stream strm;
bool compress;
bool initialized;
int level;
int work_factor;
} xfrm_stream_bzip2_t;
static const int bzlib_action[] = {
[XFRM_STREAM_FLUSH_NONE] = BZ_RUN,
[XFRM_STREAM_FLUSH_SYNC] = BZ_FLUSH,
[XFRM_STREAM_FLUSH_FULL] = BZ_FINISH,
};
static int process_data(xfrm_stream_t *stream, const void *in, sqfs_u32 in_size,
void *out, sqfs_u32 out_size,
sqfs_u32 *in_read, sqfs_u32 *out_written,
int flush_mode)
{
xfrm_stream_bzip2_t *bzip2 = (xfrm_stream_bzip2_t *)stream;
sqfs_u32 diff;
int ret;
if (!bzip2->initialized) {
if (bzip2->compress) {
ret = BZ2_bzCompressInit(&bzip2->strm, bzip2->level, 0,
bzip2->work_factor);
} else {
ret = BZ2_bzDecompressInit(&bzip2->strm, 0, 0);
}
if (ret != BZ_OK)
return XFRM_STREAM_ERROR;
bzip2->initialized = true;
}
if (flush_mode < 0 || flush_mode >= XFRM_STREAM_FLUSH_COUNT)
flush_mode = XFRM_STREAM_FLUSH_NONE;
while (in_size > 0 && out_size > 0) {
bzip2->strm.next_in = (char *)in;
bzip2->strm.avail_in = in_size;
bzip2->strm.next_out = (char *)out;
bzip2->strm.avail_out = out_size;
if (bzip2->compress) {
ret = BZ2_bzCompress(&bzip2->strm,
bzlib_action[flush_mode]);
} else {
ret = BZ2_bzDecompress(&bzip2->strm);
}
if (ret == BZ_OUTBUFF_FULL)
return XFRM_STREAM_BUFFER_FULL;
if (ret < 0)
return XFRM_STREAM_ERROR;
diff = (in_size - bzip2->strm.avail_in);
in = (const char *)in + diff;
in_size -= diff;
*in_read += diff;
diff = (out_size - bzip2->strm.avail_out);
out = (char *)out + diff;
out_size -= diff;
*out_written += diff;
if (ret == BZ_STREAM_END) {
if (bzip2->compress) {
BZ2_bzCompressEnd(&bzip2->strm);
} else {
BZ2_bzDecompressEnd(&bzip2->strm);
}
bzip2->initialized = false;
return XFRM_STREAM_END;
}
}
return XFRM_STREAM_OK;
}
static void destroy(sqfs_object_t *obj)
{
xfrm_stream_bzip2_t *bzip2 = (xfrm_stream_bzip2_t *)obj;
if (bzip2->initialized) {
if (bzip2->compress) {
BZ2_bzCompressEnd(&bzip2->strm);
} else {
BZ2_bzDecompressEnd(&bzip2->strm);
}
}
free(bzip2);
}
static xfrm_stream_t *stream_create(const compressor_config_t *cfg,
bool compress)
{
xfrm_stream_bzip2_t *bzip2 = calloc(1, sizeof(*bzip2));
xfrm_stream_t *xfrm = (xfrm_stream_t *)bzip2;
if (bzip2 == NULL) {
perror("creating bzip2 stream compressor");
return NULL;
}
if (cfg == NULL) {
bzip2->level = COMP_BZIP2_DEFAULT_LEVEL;
bzip2->work_factor = COMP_BZIP2_DEFAULT_WORK_FACTOR;
} else {
bzip2->level = cfg->level;
bzip2->work_factor = cfg->opt.bzip2.work_factor;
}
bzip2->initialized = false;
bzip2->compress = compress;
xfrm->process_data = process_data;
sqfs_object_init(bzip2, destroy, NULL);
return xfrm;
}
xfrm_stream_t *compressor_stream_bzip2_create(const compressor_config_t *cfg)
{
return stream_create(cfg, true);
}
xfrm_stream_t *decompressor_stream_bzip2_create(void)
{
return stream_create(NULL, false);
}
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