Kyungsik Lee | e76e1fd | 2013-07-08 16:01:46 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Wrapper for decompressing LZ4-compressed kernel, initramfs, and initrd |
| 3 | * |
| 4 | * Copyright (C) 2013, LG Electronics, Kyungsik Lee <kyungsik.lee@lge.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | #ifdef STATIC |
| 12 | #define PREBOOT |
| 13 | #include "lz4/lz4_decompress.c" |
| 14 | #else |
| 15 | #include <linux/decompress/unlz4.h> |
| 16 | #endif |
| 17 | #include <linux/types.h> |
| 18 | #include <linux/lz4.h> |
| 19 | #include <linux/decompress/mm.h> |
| 20 | #include <linux/compiler.h> |
| 21 | |
| 22 | #include <asm/unaligned.h> |
| 23 | |
| 24 | /* |
| 25 | * Note: Uncompressed chunk size is used in the compressor side |
| 26 | * (userspace side for compression). |
| 27 | * It is hardcoded because there is not proper way to extract it |
| 28 | * from the binary stream which is generated by the preliminary |
| 29 | * version of LZ4 tool so far. |
| 30 | */ |
| 31 | #define LZ4_DEFAULT_UNCOMPRESSED_CHUNK_SIZE (8 << 20) |
| 32 | #define ARCHIVE_MAGICNUMBER 0x184C2102 |
| 33 | |
Yinghai Lu | d97b07c | 2014-08-08 14:23:14 -0700 | [diff] [blame] | 34 | STATIC inline int INIT unlz4(u8 *input, long in_len, |
| 35 | long (*fill)(void *, unsigned long), |
| 36 | long (*flush)(void *, unsigned long), |
| 37 | u8 *output, long *posp, |
Kyungsik Lee | e76e1fd | 2013-07-08 16:01:46 -0700 | [diff] [blame] | 38 | void (*error) (char *x)) |
| 39 | { |
| 40 | int ret = -1; |
| 41 | size_t chunksize = 0; |
| 42 | size_t uncomp_chunksize = LZ4_DEFAULT_UNCOMPRESSED_CHUNK_SIZE; |
| 43 | u8 *inp; |
| 44 | u8 *inp_start; |
| 45 | u8 *outp; |
Yinghai Lu | d97b07c | 2014-08-08 14:23:14 -0700 | [diff] [blame] | 46 | long size = in_len; |
Kyungsik Lee | e76e1fd | 2013-07-08 16:01:46 -0700 | [diff] [blame] | 47 | #ifdef PREBOOT |
| 48 | size_t out_len = get_unaligned_le32(input + in_len); |
| 49 | #endif |
| 50 | size_t dest_len; |
| 51 | |
| 52 | |
| 53 | if (output) { |
| 54 | outp = output; |
| 55 | } else if (!flush) { |
| 56 | error("NULL output pointer and no flush function provided"); |
| 57 | goto exit_0; |
| 58 | } else { |
| 59 | outp = large_malloc(uncomp_chunksize); |
| 60 | if (!outp) { |
| 61 | error("Could not allocate output buffer"); |
| 62 | goto exit_0; |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | if (input && fill) { |
| 67 | error("Both input pointer and fill function provided,"); |
| 68 | goto exit_1; |
| 69 | } else if (input) { |
| 70 | inp = input; |
| 71 | } else if (!fill) { |
| 72 | error("NULL input pointer and missing fill function"); |
| 73 | goto exit_1; |
| 74 | } else { |
| 75 | inp = large_malloc(lz4_compressbound(uncomp_chunksize)); |
| 76 | if (!inp) { |
| 77 | error("Could not allocate input buffer"); |
| 78 | goto exit_1; |
| 79 | } |
| 80 | } |
| 81 | inp_start = inp; |
| 82 | |
| 83 | if (posp) |
| 84 | *posp = 0; |
| 85 | |
Yinghai Lu | 4d4b866 | 2014-08-08 14:23:10 -0700 | [diff] [blame] | 86 | if (fill) { |
| 87 | size = fill(inp, 4); |
| 88 | if (size < 4) { |
| 89 | error("data corrupted"); |
| 90 | goto exit_2; |
| 91 | } |
| 92 | } |
Kyungsik Lee | e76e1fd | 2013-07-08 16:01:46 -0700 | [diff] [blame] | 93 | |
| 94 | chunksize = get_unaligned_le32(inp); |
| 95 | if (chunksize == ARCHIVE_MAGICNUMBER) { |
Yinghai Lu | 4d4b866 | 2014-08-08 14:23:10 -0700 | [diff] [blame] | 96 | if (!fill) { |
| 97 | inp += 4; |
| 98 | size -= 4; |
| 99 | } |
Kyungsik Lee | e76e1fd | 2013-07-08 16:01:46 -0700 | [diff] [blame] | 100 | } else { |
| 101 | error("invalid header"); |
| 102 | goto exit_2; |
| 103 | } |
| 104 | |
| 105 | if (posp) |
| 106 | *posp += 4; |
| 107 | |
| 108 | for (;;) { |
| 109 | |
Yinghai Lu | 4d4b866 | 2014-08-08 14:23:10 -0700 | [diff] [blame] | 110 | if (fill) { |
| 111 | size = fill(inp, 4); |
| 112 | if (size == 0) |
| 113 | break; |
| 114 | if (size < 4) { |
| 115 | error("data corrupted"); |
| 116 | goto exit_2; |
| 117 | } |
| 118 | } |
Kyungsik Lee | e76e1fd | 2013-07-08 16:01:46 -0700 | [diff] [blame] | 119 | |
| 120 | chunksize = get_unaligned_le32(inp); |
| 121 | if (chunksize == ARCHIVE_MAGICNUMBER) { |
Yinghai Lu | 4d4b866 | 2014-08-08 14:23:10 -0700 | [diff] [blame] | 122 | if (!fill) { |
| 123 | inp += 4; |
| 124 | size -= 4; |
| 125 | } |
Kyungsik Lee | e76e1fd | 2013-07-08 16:01:46 -0700 | [diff] [blame] | 126 | if (posp) |
| 127 | *posp += 4; |
| 128 | continue; |
| 129 | } |
Yinghai Lu | 4d4b866 | 2014-08-08 14:23:10 -0700 | [diff] [blame] | 130 | |
Kyungsik Lee | e76e1fd | 2013-07-08 16:01:46 -0700 | [diff] [blame] | 131 | |
| 132 | if (posp) |
| 133 | *posp += 4; |
| 134 | |
Yinghai Lu | 4d4b866 | 2014-08-08 14:23:10 -0700 | [diff] [blame] | 135 | if (!fill) { |
| 136 | inp += 4; |
| 137 | size -= 4; |
| 138 | } else { |
Kyungsik Lee | e76e1fd | 2013-07-08 16:01:46 -0700 | [diff] [blame] | 139 | if (chunksize > lz4_compressbound(uncomp_chunksize)) { |
| 140 | error("chunk length is longer than allocated"); |
| 141 | goto exit_2; |
| 142 | } |
Yinghai Lu | 4d4b866 | 2014-08-08 14:23:10 -0700 | [diff] [blame] | 143 | size = fill(inp, chunksize); |
| 144 | if (size < chunksize) { |
| 145 | error("data corrupted"); |
| 146 | goto exit_2; |
| 147 | } |
Kyungsik Lee | e76e1fd | 2013-07-08 16:01:46 -0700 | [diff] [blame] | 148 | } |
| 149 | #ifdef PREBOOT |
| 150 | if (out_len >= uncomp_chunksize) { |
| 151 | dest_len = uncomp_chunksize; |
| 152 | out_len -= dest_len; |
| 153 | } else |
| 154 | dest_len = out_len; |
| 155 | ret = lz4_decompress(inp, &chunksize, outp, dest_len); |
| 156 | #else |
| 157 | dest_len = uncomp_chunksize; |
| 158 | ret = lz4_decompress_unknownoutputsize(inp, chunksize, outp, |
| 159 | &dest_len); |
| 160 | #endif |
| 161 | if (ret < 0) { |
| 162 | error("Decoding failed"); |
| 163 | goto exit_2; |
| 164 | } |
| 165 | |
Jan Beulich | 2a1d689 | 2014-01-23 15:56:20 -0800 | [diff] [blame] | 166 | ret = -1; |
Kyungsik Lee | e76e1fd | 2013-07-08 16:01:46 -0700 | [diff] [blame] | 167 | if (flush && flush(outp, dest_len) != dest_len) |
| 168 | goto exit_2; |
| 169 | if (output) |
| 170 | outp += dest_len; |
| 171 | if (posp) |
| 172 | *posp += chunksize; |
| 173 | |
Yinghai Lu | 4d4b866 | 2014-08-08 14:23:10 -0700 | [diff] [blame] | 174 | if (!fill) { |
| 175 | size -= chunksize; |
Kyungsik Lee | e76e1fd | 2013-07-08 16:01:46 -0700 | [diff] [blame] | 176 | |
Yinghai Lu | 4d4b866 | 2014-08-08 14:23:10 -0700 | [diff] [blame] | 177 | if (size == 0) |
| 178 | break; |
| 179 | else if (size < 0) { |
| 180 | error("data corrupted"); |
| 181 | goto exit_2; |
| 182 | } |
| 183 | inp += chunksize; |
Kyungsik Lee | e76e1fd | 2013-07-08 16:01:46 -0700 | [diff] [blame] | 184 | } |
Kyungsik Lee | e76e1fd | 2013-07-08 16:01:46 -0700 | [diff] [blame] | 185 | } |
| 186 | |
| 187 | ret = 0; |
| 188 | exit_2: |
| 189 | if (!input) |
| 190 | large_free(inp_start); |
| 191 | exit_1: |
| 192 | if (!output) |
| 193 | large_free(outp); |
| 194 | exit_0: |
| 195 | return ret; |
| 196 | } |
| 197 | |
| 198 | #ifdef PREBOOT |
Yinghai Lu | 2d3862d | 2015-09-09 15:39:12 -0700 | [diff] [blame] | 199 | STATIC int INIT __decompress(unsigned char *buf, long in_len, |
Yinghai Lu | d97b07c | 2014-08-08 14:23:14 -0700 | [diff] [blame] | 200 | long (*fill)(void*, unsigned long), |
| 201 | long (*flush)(void*, unsigned long), |
Yinghai Lu | 2d3862d | 2015-09-09 15:39:12 -0700 | [diff] [blame] | 202 | unsigned char *output, long out_len, |
Yinghai Lu | d97b07c | 2014-08-08 14:23:14 -0700 | [diff] [blame] | 203 | long *posp, |
Yinghai Lu | 2d3862d | 2015-09-09 15:39:12 -0700 | [diff] [blame] | 204 | void (*error)(char *x) |
Kyungsik Lee | e76e1fd | 2013-07-08 16:01:46 -0700 | [diff] [blame] | 205 | ) |
| 206 | { |
| 207 | return unlz4(buf, in_len - 4, fill, flush, output, posp, error); |
| 208 | } |
| 209 | #endif |