wolf SSL / wolfSSL

wolfSSL SSL/TLS library, support up to TLS1.3

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wolfcrypt/src/compress.c@4:1b0d80432c79, 2016-04-28 (annotated)

Committer:
wolfSSL
Date:
Thu Apr 28 00:57:21 2016 +0000
Revision:
4:1b0d80432c79
wolfSSL 3.9.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
wolfSSL 4:1b0d80432c79 1 /* compress.c
wolfSSL 4:1b0d80432c79 2 *
wolfSSL 4:1b0d80432c79 3 * Copyright (C) 2006-2016 wolfSSL Inc.
wolfSSL 4:1b0d80432c79 4 *
wolfSSL 4:1b0d80432c79 5 * This file is part of wolfSSL.
wolfSSL 4:1b0d80432c79 6 *
wolfSSL 4:1b0d80432c79 7 * wolfSSL is free software; you can redistribute it and/or modify
wolfSSL 4:1b0d80432c79 8 * it under the terms of the GNU General Public License as published by
wolfSSL 4:1b0d80432c79 9 * the Free Software Foundation; either version 2 of the License, or
wolfSSL 4:1b0d80432c79 10 * (at your option) any later version.
wolfSSL 4:1b0d80432c79 11 *
wolfSSL 4:1b0d80432c79 12 * wolfSSL is distributed in the hope that it will be useful,
wolfSSL 4:1b0d80432c79 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
wolfSSL 4:1b0d80432c79 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
wolfSSL 4:1b0d80432c79 15 * GNU General Public License for more details.
wolfSSL 4:1b0d80432c79 16 *
wolfSSL 4:1b0d80432c79 17 * You should have received a copy of the GNU General Public License
wolfSSL 4:1b0d80432c79 18 * along with this program; if not, write to the Free Software
wolfSSL 4:1b0d80432c79 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
wolfSSL 4:1b0d80432c79 20 */
wolfSSL 4:1b0d80432c79 21
wolfSSL 4:1b0d80432c79 22
wolfSSL 4:1b0d80432c79 23
wolfSSL 4:1b0d80432c79 24 #ifdef HAVE_CONFIG_H
wolfSSL 4:1b0d80432c79 25 #include <config.h>
wolfSSL 4:1b0d80432c79 26 #endif
wolfSSL 4:1b0d80432c79 27
wolfSSL 4:1b0d80432c79 28 #include <wolfssl/wolfcrypt/settings.h>
wolfSSL 4:1b0d80432c79 29
wolfSSL 4:1b0d80432c79 30 #ifdef HAVE_LIBZ
wolfSSL 4:1b0d80432c79 31
wolfSSL 4:1b0d80432c79 32
wolfSSL 4:1b0d80432c79 33 #include <wolfssl/wolfcrypt/compress.h>
wolfSSL 4:1b0d80432c79 34 #include <wolfssl/wolfcrypt/error-crypt.h>
wolfSSL 4:1b0d80432c79 35 #include <wolfssl/wolfcrypt/logging.h>
wolfSSL 4:1b0d80432c79 36 #ifdef NO_INLINE
wolfSSL 4:1b0d80432c79 37 #include <wolfssl/wolfcrypt/misc.h>
wolfSSL 4:1b0d80432c79 38 #else
wolfSSL 4:1b0d80432c79 39 #include <wolfcrypt/src/misc.c>
wolfSSL 4:1b0d80432c79 40 #endif
wolfSSL 4:1b0d80432c79 41
wolfSSL 4:1b0d80432c79 42 #include <zlib.h>
wolfSSL 4:1b0d80432c79 43
wolfSSL 4:1b0d80432c79 44
wolfSSL 4:1b0d80432c79 45 /* alloc user allocs to work with zlib */
wolfSSL 4:1b0d80432c79 46 static void* myAlloc(void* opaque, unsigned int item, unsigned int size)
wolfSSL 4:1b0d80432c79 47 {
wolfSSL 4:1b0d80432c79 48 (void)opaque;
wolfSSL 4:1b0d80432c79 49 return XMALLOC(item * size, opaque, DYNAMIC_TYPE_LIBZ);
wolfSSL 4:1b0d80432c79 50 }
wolfSSL 4:1b0d80432c79 51
wolfSSL 4:1b0d80432c79 52
wolfSSL 4:1b0d80432c79 53 static void myFree(void* opaque, void* memory)
wolfSSL 4:1b0d80432c79 54 {
wolfSSL 4:1b0d80432c79 55 (void)opaque;
wolfSSL 4:1b0d80432c79 56 XFREE(memory, opaque, DYNAMIC_TYPE_LIBZ);
wolfSSL 4:1b0d80432c79 57 }
wolfSSL 4:1b0d80432c79 58
wolfSSL 4:1b0d80432c79 59
wolfSSL 4:1b0d80432c79 60 #ifdef HAVE_MCAPI
wolfSSL 4:1b0d80432c79 61 #define DEFLATE_DEFAULT_WINDOWBITS 11
wolfSSL 4:1b0d80432c79 62 #define DEFLATE_DEFAULT_MEMLEVEL 1
wolfSSL 4:1b0d80432c79 63 #else
wolfSSL 4:1b0d80432c79 64 #define DEFLATE_DEFAULT_WINDOWBITS 15
wolfSSL 4:1b0d80432c79 65 #define DEFLATE_DEFAULT_MEMLEVEL 8
wolfSSL 4:1b0d80432c79 66 #endif
wolfSSL 4:1b0d80432c79 67
wolfSSL 4:1b0d80432c79 68
wolfSSL 4:1b0d80432c79 69 int wc_Compress(byte* out, word32 outSz, const byte* in, word32 inSz, word32 flags)
wolfSSL 4:1b0d80432c79 70 /*
wolfSSL 4:1b0d80432c79 71 * out - pointer to destination buffer
wolfSSL 4:1b0d80432c79 72 * outSz - size of destination buffer
wolfSSL 4:1b0d80432c79 73 * in - pointer to source buffer to compress
wolfSSL 4:1b0d80432c79 74 * inSz - size of source to compress
wolfSSL 4:1b0d80432c79 75 * flags - flags to control how compress operates
wolfSSL 4:1b0d80432c79 76 *
wolfSSL 4:1b0d80432c79 77 * return:
wolfSSL 4:1b0d80432c79 78 * negative - error code
wolfSSL 4:1b0d80432c79 79 * positive - bytes stored in out buffer
wolfSSL 4:1b0d80432c79 80 *
wolfSSL 4:1b0d80432c79 81 * Note, the output buffer still needs to be larger than the input buffer.
wolfSSL 4:1b0d80432c79 82 * The right chunk of data won't compress at all, and the lookup table will
wolfSSL 4:1b0d80432c79 83 * add to the size of the output. The libz code says the compressed
wolfSSL 4:1b0d80432c79 84 * buffer should be srcSz + 0.1% + 12.
wolfSSL 4:1b0d80432c79 85 */
wolfSSL 4:1b0d80432c79 86 {
wolfSSL 4:1b0d80432c79 87 z_stream stream;
wolfSSL 4:1b0d80432c79 88 int result = 0;
wolfSSL 4:1b0d80432c79 89
wolfSSL 4:1b0d80432c79 90 stream.next_in = (Bytef*)in;
wolfSSL 4:1b0d80432c79 91 stream.avail_in = (uInt)inSz;
wolfSSL 4:1b0d80432c79 92 #ifdef MAXSEG_64K
wolfSSL 4:1b0d80432c79 93 /* Check for source > 64K on 16-bit machine: */
wolfSSL 4:1b0d80432c79 94 if ((uLong)stream.avail_in != inSz) return COMPRESS_INIT_E;
wolfSSL 4:1b0d80432c79 95 #endif
wolfSSL 4:1b0d80432c79 96 stream.next_out = out;
wolfSSL 4:1b0d80432c79 97 stream.avail_out = (uInt)outSz;
wolfSSL 4:1b0d80432c79 98 if ((uLong)stream.avail_out != outSz) return COMPRESS_INIT_E;
wolfSSL 4:1b0d80432c79 99
wolfSSL 4:1b0d80432c79 100 stream.zalloc = (alloc_func)myAlloc;
wolfSSL 4:1b0d80432c79 101 stream.zfree = (free_func)myFree;
wolfSSL 4:1b0d80432c79 102 stream.opaque = (voidpf)0;
wolfSSL 4:1b0d80432c79 103
wolfSSL 4:1b0d80432c79 104 if (deflateInit2(&stream, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
wolfSSL 4:1b0d80432c79 105 DEFLATE_DEFAULT_WINDOWBITS, DEFLATE_DEFAULT_MEMLEVEL,
wolfSSL 4:1b0d80432c79 106 flags ? Z_FIXED : Z_DEFAULT_STRATEGY) != Z_OK)
wolfSSL 4:1b0d80432c79 107 return COMPRESS_INIT_E;
wolfSSL 4:1b0d80432c79 108
wolfSSL 4:1b0d80432c79 109 if (deflate(&stream, Z_FINISH) != Z_STREAM_END) {
wolfSSL 4:1b0d80432c79 110 deflateEnd(&stream);
wolfSSL 4:1b0d80432c79 111 return COMPRESS_E;
wolfSSL 4:1b0d80432c79 112 }
wolfSSL 4:1b0d80432c79 113
wolfSSL 4:1b0d80432c79 114 result = (int)stream.total_out;
wolfSSL 4:1b0d80432c79 115
wolfSSL 4:1b0d80432c79 116 if (deflateEnd(&stream) != Z_OK)
wolfSSL 4:1b0d80432c79 117 result = COMPRESS_E;
wolfSSL 4:1b0d80432c79 118
wolfSSL 4:1b0d80432c79 119 return result;
wolfSSL 4:1b0d80432c79 120 }
wolfSSL 4:1b0d80432c79 121
wolfSSL 4:1b0d80432c79 122
wolfSSL 4:1b0d80432c79 123 int wc_DeCompress(byte* out, word32 outSz, const byte* in, word32 inSz)
wolfSSL 4:1b0d80432c79 124 /*
wolfSSL 4:1b0d80432c79 125 * out - pointer to destination buffer
wolfSSL 4:1b0d80432c79 126 * outSz - size of destination buffer
wolfSSL 4:1b0d80432c79 127 * in - pointer to source buffer to compress
wolfSSL 4:1b0d80432c79 128 * inSz - size of source to compress
wolfSSL 4:1b0d80432c79 129 * flags - flags to control how compress operates
wolfSSL 4:1b0d80432c79 130 *
wolfSSL 4:1b0d80432c79 131 * return:
wolfSSL 4:1b0d80432c79 132 * negative - error code
wolfSSL 4:1b0d80432c79 133 * positive - bytes stored in out buffer
wolfSSL 4:1b0d80432c79 134 */
wolfSSL 4:1b0d80432c79 135 {
wolfSSL 4:1b0d80432c79 136 z_stream stream;
wolfSSL 4:1b0d80432c79 137 int result = 0;
wolfSSL 4:1b0d80432c79 138
wolfSSL 4:1b0d80432c79 139 stream.next_in = (Bytef*)in;
wolfSSL 4:1b0d80432c79 140 stream.avail_in = (uInt)inSz;
wolfSSL 4:1b0d80432c79 141 /* Check for source > 64K on 16-bit machine: */
wolfSSL 4:1b0d80432c79 142 if ((uLong)stream.avail_in != inSz) return DECOMPRESS_INIT_E;
wolfSSL 4:1b0d80432c79 143
wolfSSL 4:1b0d80432c79 144 stream.next_out = out;
wolfSSL 4:1b0d80432c79 145 stream.avail_out = (uInt)outSz;
wolfSSL 4:1b0d80432c79 146 if ((uLong)stream.avail_out != outSz) return DECOMPRESS_INIT_E;
wolfSSL 4:1b0d80432c79 147
wolfSSL 4:1b0d80432c79 148 stream.zalloc = (alloc_func)myAlloc;
wolfSSL 4:1b0d80432c79 149 stream.zfree = (free_func)myFree;
wolfSSL 4:1b0d80432c79 150 stream.opaque = (voidpf)0;
wolfSSL 4:1b0d80432c79 151
wolfSSL 4:1b0d80432c79 152 if (inflateInit2(&stream, DEFLATE_DEFAULT_WINDOWBITS) != Z_OK)
wolfSSL 4:1b0d80432c79 153 return DECOMPRESS_INIT_E;
wolfSSL 4:1b0d80432c79 154
wolfSSL 4:1b0d80432c79 155 if (inflate(&stream, Z_FINISH) != Z_STREAM_END) {
wolfSSL 4:1b0d80432c79 156 inflateEnd(&stream);
wolfSSL 4:1b0d80432c79 157 return DECOMPRESS_E;
wolfSSL 4:1b0d80432c79 158 }
wolfSSL 4:1b0d80432c79 159
wolfSSL 4:1b0d80432c79 160 result = (int)stream.total_out;
wolfSSL 4:1b0d80432c79 161
wolfSSL 4:1b0d80432c79 162 if (inflateEnd(&stream) != Z_OK)
wolfSSL 4:1b0d80432c79 163 result = DECOMPRESS_E;
wolfSSL 4:1b0d80432c79 164
wolfSSL 4:1b0d80432c79 165 return result;
wolfSSL 4:1b0d80432c79 166 }
wolfSSL 4:1b0d80432c79 167
wolfSSL 4:1b0d80432c79 168
wolfSSL 4:1b0d80432c79 169 #endif /* HAVE_LIBZ */
wolfSSL 4:1b0d80432c79 170
wolfSSL 4:1b0d80432c79 171