137 lines
3.8 KiB
C
137 lines
3.8 KiB
C
/*
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* This file uses XZ Embedded library code which is written
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* by Lasse Collin <lasse.collin@tukaani.org>
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* and Igor Pavlov <http://7-zip.org/>
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*
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* See README file in unxz/ directory for more information.
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*
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* This file is:
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* Copyright (C) 2010 Denys Vlasenko <vda.linux@googlemail.com>
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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#include "bb_archive.h"
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#define XZ_FUNC FAST_FUNC
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#define XZ_EXTERN static
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#define XZ_DEC_DYNALLOC
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/* Skip check (rather than fail) of unsupported hash functions */
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#define XZ_DEC_ANY_CHECK 1
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/* We use our own crc32 function */
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#define XZ_INTERNAL_CRC32 0
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static uint32_t xz_crc32(const uint8_t *buf, size_t size, uint32_t crc)
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{
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return ~crc32_block_endian0(~crc, buf, size, global_crc32_table);
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}
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/* We use arch-optimized unaligned fixed-endian accessors.
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* They have been moved to libbb (proved to be useful elsewhere as well),
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* just check that we have them defined:
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*/
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#if !defined(get_unaligned_le32) \
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|| !defined(get_unaligned_be32) \
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|| !defined(put_unaligned_le32) \
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|| !defined(put_unaligned_be32)
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# error get_unaligned_le32 accessors are not defined
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#endif
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#include "unxz/xz_dec_bcj.c"
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#include "unxz/xz_dec_lzma2.c"
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#include "unxz/xz_dec_stream.c"
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IF_DESKTOP(long long) int FAST_FUNC
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unpack_xz_stream(transformer_state_t *xstate)
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{
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enum xz_ret xz_result;
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struct xz_buf iobuf;
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struct xz_dec *state;
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unsigned char *membuf;
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IF_DESKTOP(long long) int total = 0;
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if (!global_crc32_table)
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global_crc32_table = crc32_filltable(NULL, /*endian:*/ 0);
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memset(&iobuf, 0, sizeof(iobuf));
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membuf = xmalloc(2 * BUFSIZ);
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iobuf.in = membuf;
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iobuf.out = membuf + BUFSIZ;
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iobuf.out_size = BUFSIZ;
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if (!xstate || xstate->signature_skipped) {
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/* Preload XZ file signature */
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strcpy((char*)membuf, HEADER_MAGIC);
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iobuf.in_size = HEADER_MAGIC_SIZE;
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} /* else: let xz code read & check it */
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/* Limit memory usage to about 64 MiB. */
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state = xz_dec_init(XZ_DYNALLOC, 64*1024*1024);
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xz_result = X_OK;
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while (1) {
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if (iobuf.in_pos == iobuf.in_size) {
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int rd = safe_read(xstate->src_fd, membuf, BUFSIZ);
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if (rd < 0) {
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bb_error_msg(bb_msg_read_error);
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total = -1;
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break;
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}
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if (rd == 0 && xz_result == XZ_STREAM_END)
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break;
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iobuf.in_size = rd;
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iobuf.in_pos = 0;
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}
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if (xz_result == XZ_STREAM_END) {
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/*
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* Try to start decoding next concatenated stream.
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* Stream padding must always be a multiple of four
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* bytes to preserve four-byte alignment. To keep the
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* code slightly smaller, we aren't as strict here as
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* the .xz spec requires. We just skip all zero-bytes
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* without checking the alignment and thus can accept
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* files that aren't valid, e.g. the XZ utils test
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* files bad-0pad-empty.xz and bad-0catpad-empty.xz.
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*/
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do {
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if (membuf[iobuf.in_pos] != 0) {
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xz_dec_reset(state);
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goto do_run;
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}
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iobuf.in_pos++;
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} while (iobuf.in_pos < iobuf.in_size);
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}
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do_run:
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// bb_error_msg(">in pos:%d size:%d out pos:%d size:%d",
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// iobuf.in_pos, iobuf.in_size, iobuf.out_pos, iobuf.out_size);
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xz_result = xz_dec_run(state, &iobuf);
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// bb_error_msg("<in pos:%d size:%d out pos:%d size:%d r:%d",
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// iobuf.in_pos, iobuf.in_size, iobuf.out_pos, iobuf.out_size, xz_result);
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if (iobuf.out_pos) {
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xtransformer_write(xstate, iobuf.out, iobuf.out_pos);
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IF_DESKTOP(total += iobuf.out_pos;)
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iobuf.out_pos = 0;
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}
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if (xz_result == XZ_STREAM_END) {
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/*
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* Can just "break;" here, if not for concatenated
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* .xz streams.
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* Checking for padding may require buffer
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* replenishment. Can't do it here.
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*/
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continue;
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}
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if (xz_result != XZ_OK && xz_result != XZ_UNSUPPORTED_CHECK) {
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bb_error_msg("corrupted data");
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total = -1;
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break;
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}
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}
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xz_dec_end(state);
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free(membuf);
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return total;
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}
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