/* * 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 accessors */ #define get_unaligned_le32(buf) ({ uint32_t v; move_from_unaligned32(v, buf); SWAP_LE32(v); }) #define get_unaligned_be32(buf) ({ uint32_t v; move_from_unaligned32(v, buf); SWAP_BE32(v); }) #define put_unaligned_le32(val, buf) move_to_unaligned32(buf, SWAP_LE32(val)) #define put_unaligned_be32(val, buf) move_to_unaligned32(buf, SWAP_BE32(val)) #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; }