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287 lines
6.4 KiB
287 lines
6.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* LZO decompressor for the Linux kernel. Code borrowed from the lzo |
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* implementation by Markus Franz Xaver Johannes Oberhumer. |
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* |
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* Linux kernel adaptation: |
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* Copyright (C) 2009 |
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* Albin Tonnerre, Free Electrons <[email protected]> |
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* |
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* Original code: |
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* Copyright (C) 1996-2005 Markus Franz Xaver Johannes Oberhumer |
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* All Rights Reserved. |
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* |
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* Markus F.X.J. Oberhumer |
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* <[email protected]> |
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* http://www.oberhumer.com/opensource/lzop/ |
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*/ |
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#ifdef STATIC |
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#define PREBOOT |
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#include "lzo/lzo1x_decompress_safe.c" |
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#else |
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#include <linux/decompress/unlzo.h> |
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#endif |
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#include <linux/types.h> |
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#include <linux/lzo.h> |
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#include <linux/decompress/mm.h> |
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#include <linux/compiler.h> |
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#include <asm/unaligned.h> |
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static const unsigned char lzop_magic[] = { |
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0x89, 0x4c, 0x5a, 0x4f, 0x00, 0x0d, 0x0a, 0x1a, 0x0a }; |
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#define LZO_BLOCK_SIZE (256*1024l) |
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#define HEADER_HAS_FILTER 0x00000800L |
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#define HEADER_SIZE_MIN (9 + 7 + 4 + 8 + 1 + 4) |
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#define HEADER_SIZE_MAX (9 + 7 + 1 + 8 + 8 + 4 + 1 + 255 + 4) |
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STATIC inline long INIT parse_header(u8 *input, long *skip, long in_len) |
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{ |
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int l; |
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u8 *parse = input; |
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u8 *end = input + in_len; |
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u8 level = 0; |
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u16 version; |
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/* |
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* Check that there's enough input to possibly have a valid header. |
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* Then it is possible to parse several fields until the minimum |
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* size may have been used. |
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*/ |
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if (in_len < HEADER_SIZE_MIN) |
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return 0; |
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/* read magic: 9 first bits */ |
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for (l = 0; l < 9; l++) { |
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if (*parse++ != lzop_magic[l]) |
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return 0; |
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} |
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/* get version (2bytes), skip library version (2), |
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* 'need to be extracted' version (2) and |
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* method (1) */ |
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version = get_unaligned_be16(parse); |
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parse += 7; |
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if (version >= 0x0940) |
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level = *parse++; |
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if (get_unaligned_be32(parse) & HEADER_HAS_FILTER) |
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parse += 8; /* flags + filter info */ |
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else |
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parse += 4; /* flags */ |
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/* |
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* At least mode, mtime_low, filename length, and checksum must |
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* be left to be parsed. If also mtime_high is present, it's OK |
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* because the next input buffer check is after reading the |
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* filename length. |
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*/ |
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if (end - parse < 8 + 1 + 4) |
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return 0; |
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/* skip mode and mtime_low */ |
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parse += 8; |
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if (version >= 0x0940) |
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parse += 4; /* skip mtime_high */ |
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l = *parse++; |
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/* don't care about the file name, and skip checksum */ |
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if (end - parse < l + 4) |
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return 0; |
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parse += l + 4; |
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*skip = parse - input; |
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return 1; |
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} |
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STATIC int INIT unlzo(u8 *input, long in_len, |
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long (*fill)(void *, unsigned long), |
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long (*flush)(void *, unsigned long), |
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u8 *output, long *posp, |
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void (*error) (char *x)) |
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{ |
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u8 r = 0; |
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long skip = 0; |
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u32 src_len, dst_len; |
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size_t tmp; |
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u8 *in_buf, *in_buf_save, *out_buf; |
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int ret = -1; |
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if (output) { |
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out_buf = output; |
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} else if (!flush) { |
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error("NULL output pointer and no flush function provided"); |
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goto exit; |
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} else { |
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out_buf = malloc(LZO_BLOCK_SIZE); |
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if (!out_buf) { |
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error("Could not allocate output buffer"); |
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goto exit; |
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} |
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} |
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if (input && fill) { |
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error("Both input pointer and fill function provided, don't know what to do"); |
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goto exit_1; |
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} else if (input) { |
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in_buf = input; |
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} else if (!fill) { |
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error("NULL input pointer and missing fill function"); |
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goto exit_1; |
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} else { |
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in_buf = malloc(lzo1x_worst_compress(LZO_BLOCK_SIZE)); |
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if (!in_buf) { |
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error("Could not allocate input buffer"); |
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goto exit_1; |
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} |
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} |
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in_buf_save = in_buf; |
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if (posp) |
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*posp = 0; |
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if (fill) { |
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/* |
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* Start from in_buf + HEADER_SIZE_MAX to make it possible |
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* to use memcpy() to copy the unused data to the beginning |
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* of the buffer. This way memmove() isn't needed which |
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* is missing from pre-boot environments of most archs. |
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*/ |
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in_buf += HEADER_SIZE_MAX; |
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in_len = fill(in_buf, HEADER_SIZE_MAX); |
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} |
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if (!parse_header(in_buf, &skip, in_len)) { |
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error("invalid header"); |
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goto exit_2; |
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} |
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in_buf += skip; |
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in_len -= skip; |
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if (fill) { |
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/* Move the unused data to the beginning of the buffer. */ |
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memcpy(in_buf_save, in_buf, in_len); |
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in_buf = in_buf_save; |
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} |
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if (posp) |
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*posp = skip; |
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for (;;) { |
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/* read uncompressed block size */ |
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if (fill && in_len < 4) { |
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skip = fill(in_buf + in_len, 4 - in_len); |
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if (skip > 0) |
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in_len += skip; |
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} |
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if (in_len < 4) { |
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error("file corrupted"); |
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goto exit_2; |
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} |
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dst_len = get_unaligned_be32(in_buf); |
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in_buf += 4; |
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in_len -= 4; |
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/* exit if last block */ |
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if (dst_len == 0) { |
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if (posp) |
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*posp += 4; |
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break; |
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} |
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if (dst_len > LZO_BLOCK_SIZE) { |
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error("dest len longer than block size"); |
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goto exit_2; |
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} |
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/* read compressed block size, and skip block checksum info */ |
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if (fill && in_len < 8) { |
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skip = fill(in_buf + in_len, 8 - in_len); |
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if (skip > 0) |
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in_len += skip; |
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} |
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if (in_len < 8) { |
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error("file corrupted"); |
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goto exit_2; |
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} |
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src_len = get_unaligned_be32(in_buf); |
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in_buf += 8; |
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in_len -= 8; |
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if (src_len <= 0 || src_len > dst_len) { |
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error("file corrupted"); |
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goto exit_2; |
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} |
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/* decompress */ |
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if (fill && in_len < src_len) { |
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skip = fill(in_buf + in_len, src_len - in_len); |
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if (skip > 0) |
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in_len += skip; |
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} |
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if (in_len < src_len) { |
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error("file corrupted"); |
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goto exit_2; |
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} |
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tmp = dst_len; |
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/* When the input data is not compressed at all, |
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* lzo1x_decompress_safe will fail, so call memcpy() |
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* instead */ |
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if (unlikely(dst_len == src_len)) |
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memcpy(out_buf, in_buf, src_len); |
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else { |
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r = lzo1x_decompress_safe((u8 *) in_buf, src_len, |
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out_buf, &tmp); |
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if (r != LZO_E_OK || dst_len != tmp) { |
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error("Compressed data violation"); |
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goto exit_2; |
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} |
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} |
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if (flush && flush(out_buf, dst_len) != dst_len) |
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goto exit_2; |
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if (output) |
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out_buf += dst_len; |
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if (posp) |
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*posp += src_len + 12; |
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in_buf += src_len; |
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in_len -= src_len; |
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if (fill) { |
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/* |
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* If there happens to still be unused data left in |
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* in_buf, move it to the beginning of the buffer. |
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* Use a loop to avoid memmove() dependency. |
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*/ |
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if (in_len > 0) |
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for (skip = 0; skip < in_len; ++skip) |
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in_buf_save[skip] = in_buf[skip]; |
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in_buf = in_buf_save; |
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} |
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} |
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ret = 0; |
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exit_2: |
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if (!input) |
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free(in_buf_save); |
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exit_1: |
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if (!output) |
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free(out_buf); |
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exit: |
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return ret; |
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} |
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#ifdef PREBOOT |
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STATIC int INIT __decompress(unsigned char *buf, long len, |
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long (*fill)(void*, unsigned long), |
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long (*flush)(void*, unsigned long), |
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unsigned char *out_buf, long olen, |
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long *pos, |
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void (*error)(char *x)) |
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{ |
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return unlzo(buf, len, fill, flush, out_buf, pos, error); |
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} |
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#endif
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