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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <lzma.h>
#include "internal.h"
typedef struct {
compressor_t base;
size_t block_size;
} xz_compressor_t;
static int xz_write_options(compressor_t *base, int fd)
{
(void)base;
(void)fd;
return 0;
}
static int xz_read_options(compressor_t *base, int fd)
{
(void)base;
(void)fd;
fputs("xz extra options are not yet implemented\n", stderr);
return -1;
}
static ssize_t xz_comp_block(compressor_t *base, const uint8_t *in,
size_t size, uint8_t *out, size_t outsize)
{
xz_compressor_t *xz = (xz_compressor_t *)base;
lzma_filter filters[5];
lzma_options_lzma opt;
size_t written = 0;
lzma_ret ret;
if (lzma_lzma_preset(&opt, LZMA_PRESET_DEFAULT)) {
fputs("error initializing xz options\n", stderr);
return -1;
}
opt.dict_size = xz->block_size;
filters[0].id = LZMA_FILTER_LZMA2;
filters[0].options = &opt;
filters[1].id = LZMA_VLI_UNKNOWN;
filters[1].options = NULL;
ret = lzma_stream_buffer_encode(filters, LZMA_CHECK_CRC32, NULL,
in, size, out, &written, outsize);
if (ret == LZMA_OK)
return (written >= size) ? 0 : written;
if (ret != LZMA_BUF_ERROR) {
fputs("xz block compress failed\n", stderr);
return -1;
}
return 0;
}
static ssize_t xz_uncomp_block(compressor_t *base, const uint8_t *in,
size_t size, uint8_t *out, size_t outsize)
{
uint64_t memlimit = 32 * 1024 * 1024;
size_t dest_pos = 0;
size_t src_pos = 0;
lzma_ret ret;
(void)base;
ret = lzma_stream_buffer_decode(&memlimit, 0, NULL,
in, &src_pos, size,
out, &dest_pos, outsize);
if (ret == LZMA_OK && size == src_pos)
return (ssize_t)dest_pos;
fputs("xz block extract failed\n", stderr);
return -1;
}
static void xz_destroy(compressor_t *base)
{
free(base);
}
compressor_t *create_xz_compressor(bool compress, size_t block_size,
char *options)
{
xz_compressor_t *xz = calloc(1, sizeof(*xz));
compressor_t *base = (compressor_t *)xz;
if (xz == NULL) {
perror("creating xz compressor");
return NULL;
}
xz->block_size = block_size;
base->destroy = xz_destroy;
base->do_block = compress ? xz_comp_block : xz_uncomp_block;
base->write_options = xz_write_options;
base->read_options = xz_read_options;
return base;
}
void compressor_xz_print_help(void)
{
}
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