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Diffstat (limited to 'archival/libarchive/decompress_unxz.c')
| -rw-r--r-- | archival/libarchive/decompress_unxz.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/archival/libarchive/decompress_unxz.c b/archival/libarchive/decompress_unxz.c new file mode 100644 index 0000000..e90dfb0 --- /dev/null +++ b/archival/libarchive/decompress_unxz.c @@ -0,0 +1,98 @@ +/* + * 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 "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_unaligned16(buf, SWAP_LE32(val)) +#define put_unaligned_be32(val, buf) move_to_unaligned16(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(int src_fd, int dst_fd) +{ + 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)); + /* Preload XZ file signature */ + membuf = (void*) strcpy(xmalloc(2 * BUFSIZ), HEADER_MAGIC); + iobuf.in = membuf; + iobuf.in_size = HEADER_MAGIC_SIZE; + iobuf.out = membuf + BUFSIZ; + iobuf.out_size = BUFSIZ; + + /* Limit memory usage to about 64 MiB. */ + state = xz_dec_init(XZ_DYNALLOC, 64*1024*1024); + + while (1) { + enum xz_ret r; + + if (iobuf.in_pos == iobuf.in_size) { + int rd = safe_read(src_fd, membuf, BUFSIZ); + if (rd < 0) { + bb_error_msg(bb_msg_read_error); + total = -1; + break; + } + iobuf.in_size = rd; + iobuf.in_pos = 0; + } +// 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); + r = 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, r); + if (iobuf.out_pos) { + xwrite(dst_fd, iobuf.out, iobuf.out_pos); + IF_DESKTOP(total += iobuf.out_pos;) + iobuf.out_pos = 0; + } + if (r == XZ_STREAM_END) { + break; + } + if (r != XZ_OK && r != XZ_UNSUPPORTED_CHECK) { + bb_error_msg("corrupted data"); + total = -1; + break; + } + } + xz_dec_end(state); + free(membuf); + + return total; +} |