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