148 lines
2.9 KiB
C
148 lines
2.9 KiB
C
/*
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* Simple XZ decoder command line tool
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*
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* Author: Lasse Collin <lasse.collin@tukaani.org>
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*
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* This file has been put into the public domain.
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* You can do whatever you want with this file.
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*/
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/*
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* This is really limited: Not all filters from .xz format are supported,
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* only CRC32 is supported as the integrity check, and decoding of
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* concatenated .xz streams is not supported. Thus, you may want to look
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* at xzdec from XZ Utils if a few KiB bigger tool is not a problem.
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*/
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#include <stdbool.h>
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#include <stdio.h>
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#include <string.h>
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#include "xz.h"
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static uint8_t in[BUFSIZ];
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static uint8_t out[BUFSIZ];
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int main(int argc, char **argv)
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{
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struct xz_buf b;
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struct xz_dec *s;
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enum xz_ret ret;
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const char *msg;
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if (argc >= 2 && strcmp(argv[1], "--help") == 0) {
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fputs("Uncompress a .xz file from stdin to stdout.\n"
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"Arguments other than `--help' are ignored.\n",
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stdout);
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return 0;
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}
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xz_crc32_init();
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#ifdef XZ_USE_CRC64
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xz_crc64_init();
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#endif
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/*
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* Support up to 64 MiB dictionary. The actually needed memory
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* is allocated once the headers have been parsed.
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*/
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s = xz_dec_init(XZ_DYNALLOC, 1 << 26);
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if (s == NULL) {
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msg = "Memory allocation failed\n";
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goto error;
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}
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b.in = in;
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b.in_pos = 0;
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b.in_size = 0;
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b.out = out;
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b.out_pos = 0;
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b.out_size = BUFSIZ;
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while (true) {
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if (b.in_pos == b.in_size) {
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b.in_size = fread(in, 1, sizeof(in), stdin);
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if (ferror(stdin)) {
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msg = "Read error\n";
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goto error;
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}
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b.in_pos = 0;
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}
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/*
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* There are a few ways to set the "finish" (the third)
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* argument. We could use feof(stdin) but testing in_size
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* is fine too and may also work in applications that don't
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* use FILEs.
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*/
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ret = xz_dec_catrun(s, &b, b.in_size == 0);
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if (b.out_pos == sizeof(out)) {
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if (fwrite(out, 1, b.out_pos, stdout) != b.out_pos) {
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msg = "Write error\n";
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goto error;
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}
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b.out_pos = 0;
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}
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if (ret == XZ_OK)
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continue;
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#ifdef XZ_DEC_ANY_CHECK
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if (ret == XZ_UNSUPPORTED_CHECK) {
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fputs(argv[0], stderr);
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fputs(": ", stderr);
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fputs("Unsupported check; not verifying "
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"file integrity\n", stderr);
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continue;
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}
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#endif
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if (fwrite(out, 1, b.out_pos, stdout) != b.out_pos
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|| fclose(stdout)) {
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msg = "Write error\n";
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goto error;
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}
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switch (ret) {
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case XZ_STREAM_END:
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xz_dec_end(s);
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return 0;
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case XZ_MEM_ERROR:
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msg = "Memory allocation failed\n";
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goto error;
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case XZ_MEMLIMIT_ERROR:
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msg = "Memory usage limit reached\n";
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goto error;
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case XZ_FORMAT_ERROR:
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msg = "Not a .xz file\n";
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goto error;
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case XZ_OPTIONS_ERROR:
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msg = "Unsupported options in the .xz headers\n";
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goto error;
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case XZ_DATA_ERROR:
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case XZ_BUF_ERROR:
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msg = "File is corrupt\n";
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goto error;
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default:
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msg = "Bug!\n";
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goto error;
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}
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}
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error:
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xz_dec_end(s);
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fputs(argv[0], stderr);
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fputs(": ", stderr);
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fputs(msg, stderr);
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return 1;
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}
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