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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* xz.c
*
* Copyright (C) 2021 David Oberhollenzer <goliath@infraroot.at>
*/
#include <stdlib.h>
#include <stdio.h>
#include <lzma.h>
#include "xfrm/stream.h"
#include "xfrm/compress.h"
typedef struct {
xfrm_stream_t base;
lzma_stream strm;
sqfs_u64 memlimit;
lzma_filter filters[3];
lzma_options_lzma opt;
lzma_vli vli_filter;
sqfs_u32 presets;
bool compress;
bool initialized;
} xfrm_xz_t;
static const lzma_action xzlib_action[] = {
[XFRM_STREAM_FLUSH_NONE] = LZMA_RUN,
[XFRM_STREAM_FLUSH_SYNC] = LZMA_FULL_FLUSH,
[XFRM_STREAM_FLUSH_FULL] = LZMA_FINISH,
};
static lzma_vli vli_filter_from_flags(int vli)
{
switch (vli) {
case COMP_XZ_VLI_X86:
return LZMA_FILTER_X86;
case COMP_XZ_VLI_POWERPC:
return LZMA_FILTER_POWERPC;
case COMP_XZ_VLI_IA64:
return LZMA_FILTER_IA64;
case COMP_XZ_VLI_ARM:
return LZMA_FILTER_ARM;
case COMP_XZ_VLI_ARMTHUMB:
return LZMA_FILTER_ARMTHUMB;
case COMP_XZ_VLI_SPARC:
return LZMA_FILTER_SPARC;
default:
return LZMA_VLI_UNKNOWN;
}
}
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_xz_t *xz = (xfrm_xz_t *)stream;
lzma_ret ret_xz;
sqfs_u32 diff;
if (!xz->initialized) {
if (xz->compress) {
ret_xz = lzma_stream_encoder(&xz->strm, xz->filters,
LZMA_CHECK_CRC32);
} else {
ret_xz = lzma_stream_decoder(&xz->strm,
xz->memlimit, 0);
}
if (ret_xz != LZMA_OK)
return XFRM_STREAM_ERROR;
xz->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) {
xz->strm.next_in = in;
xz->strm.avail_in = in_size;
xz->strm.next_out = out;
xz->strm.avail_out = out_size;
ret_xz = lzma_code(&xz->strm, xzlib_action[flush_mode]);
if (ret_xz != LZMA_OK && ret_xz != LZMA_BUF_ERROR &&
ret_xz != LZMA_STREAM_END) {
return XFRM_STREAM_ERROR;
}
diff = in_size - xz->strm.avail_in;
in = (const char *)in + diff;
in_size -= diff;
*in_read += diff;
diff = out_size - xz->strm.avail_out;
out = (char *)out + diff;
out_size -= diff;
*out_written += diff;
if (ret_xz == LZMA_BUF_ERROR)
return XFRM_STREAM_BUFFER_FULL;
if (ret_xz == LZMA_STREAM_END) {
lzma_end(&xz->strm);
xz->initialized = false;
return XFRM_STREAM_END;
}
}
return XFRM_STREAM_OK;
}
static void destroy(sqfs_object_t *obj)
{
xfrm_xz_t *xz = (xfrm_xz_t *)obj;
if (xz->initialized)
lzma_end(&xz->strm);
free(xz);
}
static xfrm_stream_t *create_stream(const compressor_config_t *cfg,
bool compress)
{
xfrm_xz_t *xz = calloc(1, sizeof(*xz));
xfrm_stream_t *xfrm = (xfrm_stream_t *)xz;
int i = 0;
if (xz == NULL) {
perror("creating xz stream compressor");
return NULL;
}
xz->memlimit = 128 * 1024 * 1024;
xz->compress = compress;
xz->initialized = false;
if (compress) {
if (cfg == NULL) {
xz->presets = COMP_XZ_DEFAULT_LEVEL;
} else {
xz->presets = cfg->level;
if (cfg->flags & COMP_FLAG_XZ_EXTREME)
xz->presets |= LZMA_PRESET_EXTREME;
}
if (lzma_lzma_preset(&xz->opt, xz->presets))
goto fail_init;
if (cfg == NULL) {
xz->vli_filter = LZMA_VLI_UNKNOWN;
} else {
xz->vli_filter = vli_filter_from_flags(cfg->opt.xz.vli);
}
if (xz->vli_filter != LZMA_VLI_UNKNOWN) {
xz->filters[i].id = xz->vli_filter;
xz->filters[i].options = NULL;
++i;
}
xz->filters[i].id = LZMA_FILTER_LZMA2;
xz->filters[i].options = &xz->opt;
++i;
xz->filters[i].id = LZMA_VLI_UNKNOWN;
xz->filters[i].options = NULL;
++i;
}
xfrm->process_data = process_data;
sqfs_object_init(xz, destroy, NULL);
return xfrm;
fail_init:
fputs("error initializing XZ compressor\n", stderr);
free(xz);
return NULL;
}
xfrm_stream_t *compressor_stream_xz_create(const compressor_config_t *cfg)
{
return create_stream(cfg, true);
}
xfrm_stream_t *decompressor_stream_xz_create(void)
{
return create_stream(NULL, false);
}
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