// SPDX-License-Identifier: GPL-2.0
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#include <errno.h>
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#include <lzma.h>
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#include <stdio.h>
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#include <linux/compiler.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "compress.h"
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#include "debug.h"
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#include <string.h>
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#include <unistd.h>
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#include <internal/lib.h>
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#define BUFSIZE 8192
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static const char *lzma_strerror(lzma_ret ret)
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{
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switch ((int) ret) {
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case LZMA_MEM_ERROR:
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return "Memory allocation failed";
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case LZMA_OPTIONS_ERROR:
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return "Unsupported decompressor flags";
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case LZMA_FORMAT_ERROR:
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return "The input is not in the .xz format";
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case LZMA_DATA_ERROR:
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return "Compressed file is corrupt";
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case LZMA_BUF_ERROR:
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return "Compressed file is truncated or otherwise corrupt";
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default:
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return "Unknown error, possibly a bug";
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}
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}
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int lzma_decompress_to_file(const char *input, int output_fd)
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{
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lzma_action action = LZMA_RUN;
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lzma_stream strm = LZMA_STREAM_INIT;
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lzma_ret ret;
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int err = -1;
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u8 buf_in[BUFSIZE];
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u8 buf_out[BUFSIZE];
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FILE *infile;
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infile = fopen(input, "rb");
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if (!infile) {
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pr_err("lzma: fopen failed on %s: '%s'\n",
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input, strerror(errno));
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return -1;
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}
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ret = lzma_stream_decoder(&strm, UINT64_MAX, LZMA_CONCATENATED);
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if (ret != LZMA_OK) {
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pr_err("lzma: lzma_stream_decoder failed %s (%d)\n",
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lzma_strerror(ret), ret);
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goto err_fclose;
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}
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strm.next_in = NULL;
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strm.avail_in = 0;
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strm.next_out = buf_out;
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strm.avail_out = sizeof(buf_out);
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while (1) {
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if (strm.avail_in == 0 && !feof(infile)) {
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strm.next_in = buf_in;
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strm.avail_in = fread(buf_in, 1, sizeof(buf_in), infile);
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if (ferror(infile)) {
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pr_err("lzma: read error: %s\n", strerror(errno));
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goto err_lzma_end;
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}
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if (feof(infile))
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action = LZMA_FINISH;
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}
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ret = lzma_code(&strm, action);
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if (strm.avail_out == 0 || ret == LZMA_STREAM_END) {
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ssize_t write_size = sizeof(buf_out) - strm.avail_out;
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if (writen(output_fd, buf_out, write_size) != write_size) {
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pr_err("lzma: write error: %s\n", strerror(errno));
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goto err_lzma_end;
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}
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strm.next_out = buf_out;
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strm.avail_out = sizeof(buf_out);
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}
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if (ret != LZMA_OK) {
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if (ret == LZMA_STREAM_END)
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break;
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pr_err("lzma: failed %s\n", lzma_strerror(ret));
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goto err_lzma_end;
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}
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}
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err = 0;
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err_lzma_end:
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lzma_end(&strm);
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err_fclose:
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fclose(infile);
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return err;
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}
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bool lzma_is_compressed(const char *input)
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{
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int fd = open(input, O_RDONLY);
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const uint8_t magic[6] = { 0xFD, '7', 'z', 'X', 'Z', 0x00 };
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char buf[6] = { 0 };
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ssize_t rc;
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if (fd < 0)
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return -1;
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rc = read(fd, buf, sizeof(buf));
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close(fd);
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return rc == sizeof(buf) ?
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memcmp(buf, magic, sizeof(buf)) == 0 : false;
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}
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