wolf SSL / CyaSSL-2.9.4

SSL/TLS Library

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CyaSSL is SSL/TLS library for embedded systems.

wolfssl.com

ctaocrypt/src/compress.c@0:9d17e4342598, 2014-04-20 (annotated)

Committer:
wolfSSL
Date:
Sun Apr 20 12:40:57 2014 +0000
Revision:
0:9d17e4342598
CyaSSL SSL/TLS Library 2.9.4;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
wolfSSL 0:9d17e4342598 1 /* compress.c
wolfSSL 0:9d17e4342598 2 *
wolfSSL 0:9d17e4342598 3 * Copyright (C) 2006-2013 wolfSSL Inc.
wolfSSL 0:9d17e4342598 4 *
wolfSSL 0:9d17e4342598 5 * This file is part of CyaSSL.
wolfSSL 0:9d17e4342598 6 *
wolfSSL 0:9d17e4342598 7 * CyaSSL is free software; you can redistribute it and/or modify
wolfSSL 0:9d17e4342598 8 * it under the terms of the GNU General Public License as published by
wolfSSL 0:9d17e4342598 9 * the Free Software Foundation; either version 2 of the License, or
wolfSSL 0:9d17e4342598 10 * (at your option) any later version.
wolfSSL 0:9d17e4342598 11 *
wolfSSL 0:9d17e4342598 12 * CyaSSL is distributed in the hope that it will be useful,
wolfSSL 0:9d17e4342598 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
wolfSSL 0:9d17e4342598 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
wolfSSL 0:9d17e4342598 15 * GNU General Public License for more details.
wolfSSL 0:9d17e4342598 16 *
wolfSSL 0:9d17e4342598 17 * You should have received a copy of the GNU General Public License
wolfSSL 0:9d17e4342598 18 * along with this program; if not, write to the Free Software
wolfSSL 0:9d17e4342598 19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
wolfSSL 0:9d17e4342598 20 */
wolfSSL 0:9d17e4342598 21
wolfSSL 0:9d17e4342598 22
wolfSSL 0:9d17e4342598 23 #ifdef HAVE_CONFIG_H
wolfSSL 0:9d17e4342598 24 #include <config.h>
wolfSSL 0:9d17e4342598 25 #endif
wolfSSL 0:9d17e4342598 26
wolfSSL 0:9d17e4342598 27 #include <cyassl/ctaocrypt/settings.h>
wolfSSL 0:9d17e4342598 28
wolfSSL 0:9d17e4342598 29 #ifdef HAVE_LIBZ
wolfSSL 0:9d17e4342598 30
wolfSSL 0:9d17e4342598 31
wolfSSL 0:9d17e4342598 32 #include <cyassl/ctaocrypt/compress.h>
wolfSSL 0:9d17e4342598 33 #include <cyassl/ctaocrypt/error-crypt.h>
wolfSSL 0:9d17e4342598 34 #include <cyassl/ctaocrypt/logging.h>
wolfSSL 0:9d17e4342598 35 #ifdef NO_INLINE
wolfSSL 0:9d17e4342598 36 #include <cyassl/ctaocrypt/misc.h>
wolfSSL 0:9d17e4342598 37 #else
wolfSSL 0:9d17e4342598 38 #include <ctaocrypt/src/misc.c>
wolfSSL 0:9d17e4342598 39 #endif
wolfSSL 0:9d17e4342598 40
wolfSSL 0:9d17e4342598 41 #include <zlib.h>
wolfSSL 0:9d17e4342598 42
wolfSSL 0:9d17e4342598 43
wolfSSL 0:9d17e4342598 44 /* alloc user allocs to work with zlib */
wolfSSL 0:9d17e4342598 45 static void* myAlloc(void* opaque, unsigned int item, unsigned int size)
wolfSSL 0:9d17e4342598 46 {
wolfSSL 0:9d17e4342598 47 (void)opaque;
wolfSSL 0:9d17e4342598 48 return XMALLOC(item * size, opaque, DYNAMIC_TYPE_LIBZ);
wolfSSL 0:9d17e4342598 49 }
wolfSSL 0:9d17e4342598 50
wolfSSL 0:9d17e4342598 51
wolfSSL 0:9d17e4342598 52 static void myFree(void* opaque, void* memory)
wolfSSL 0:9d17e4342598 53 {
wolfSSL 0:9d17e4342598 54 (void)opaque;
wolfSSL 0:9d17e4342598 55 XFREE(memory, opaque, DYNAMIC_TYPE_LIBZ);
wolfSSL 0:9d17e4342598 56 }
wolfSSL 0:9d17e4342598 57
wolfSSL 0:9d17e4342598 58
wolfSSL 0:9d17e4342598 59 #ifdef HAVE_MCAPI
wolfSSL 0:9d17e4342598 60 #define DEFLATE_DEFAULT_WINDOWBITS 11
wolfSSL 0:9d17e4342598 61 #define DEFLATE_DEFAULT_MEMLEVEL 1
wolfSSL 0:9d17e4342598 62 #else
wolfSSL 0:9d17e4342598 63 #define DEFLATE_DEFAULT_WINDOWBITS 15
wolfSSL 0:9d17e4342598 64 #define DEFLATE_DEFAULT_MEMLEVEL 8
wolfSSL 0:9d17e4342598 65 #endif
wolfSSL 0:9d17e4342598 66
wolfSSL 0:9d17e4342598 67
wolfSSL 0:9d17e4342598 68 int Compress(byte* out, word32 outSz, const byte* in, word32 inSz, word32 flags)
wolfSSL 0:9d17e4342598 69 /*
wolfSSL 0:9d17e4342598 70 * out - pointer to destination buffer
wolfSSL 0:9d17e4342598 71 * outSz - size of destination buffer
wolfSSL 0:9d17e4342598 72 * in - pointer to source buffer to compress
wolfSSL 0:9d17e4342598 73 * inSz - size of source to compress
wolfSSL 0:9d17e4342598 74 * flags - flags to control how compress operates
wolfSSL 0:9d17e4342598 75 *
wolfSSL 0:9d17e4342598 76 * return:
wolfSSL 0:9d17e4342598 77 * negative - error code
wolfSSL 0:9d17e4342598 78 * positive - bytes stored in out buffer
wolfSSL 0:9d17e4342598 79 *
wolfSSL 0:9d17e4342598 80 * Note, the output buffer still needs to be larger than the input buffer.
wolfSSL 0:9d17e4342598 81 * The right chunk of data won't compress at all, and the lookup table will
wolfSSL 0:9d17e4342598 82 * add to the size of the output. The libz code says the compressed
wolfSSL 0:9d17e4342598 83 * buffer should be srcSz + 0.1% + 12.
wolfSSL 0:9d17e4342598 84 */
wolfSSL 0:9d17e4342598 85 {
wolfSSL 0:9d17e4342598 86 z_stream stream;
wolfSSL 0:9d17e4342598 87 int result = 0;
wolfSSL 0:9d17e4342598 88
wolfSSL 0:9d17e4342598 89 stream.next_in = (Bytef*)in;
wolfSSL 0:9d17e4342598 90 stream.avail_in = (uInt)inSz;
wolfSSL 0:9d17e4342598 91 #ifdef MAXSEG_64K
wolfSSL 0:9d17e4342598 92 /* Check for source > 64K on 16-bit machine: */
wolfSSL 0:9d17e4342598 93 if ((uLong)stream.avail_in != inSz) return COMPRESS_INIT_E;
wolfSSL 0:9d17e4342598 94 #endif
wolfSSL 0:9d17e4342598 95 stream.next_out = out;
wolfSSL 0:9d17e4342598 96 stream.avail_out = (uInt)outSz;
wolfSSL 0:9d17e4342598 97 if ((uLong)stream.avail_out != outSz) return COMPRESS_INIT_E;
wolfSSL 0:9d17e4342598 98
wolfSSL 0:9d17e4342598 99 stream.zalloc = (alloc_func)myAlloc;
wolfSSL 0:9d17e4342598 100 stream.zfree = (free_func)myFree;
wolfSSL 0:9d17e4342598 101 stream.opaque = (voidpf)0;
wolfSSL 0:9d17e4342598 102
wolfSSL 0:9d17e4342598 103 if (deflateInit2(&stream, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
wolfSSL 0:9d17e4342598 104 DEFLATE_DEFAULT_WINDOWBITS, DEFLATE_DEFAULT_MEMLEVEL,
wolfSSL 0:9d17e4342598 105 flags ? Z_FIXED : Z_DEFAULT_STRATEGY) != Z_OK)
wolfSSL 0:9d17e4342598 106 return COMPRESS_INIT_E;
wolfSSL 0:9d17e4342598 107
wolfSSL 0:9d17e4342598 108 if (deflate(&stream, Z_FINISH) != Z_STREAM_END) {
wolfSSL 0:9d17e4342598 109 deflateEnd(&stream);
wolfSSL 0:9d17e4342598 110 return COMPRESS_E;
wolfSSL 0:9d17e4342598 111 }
wolfSSL 0:9d17e4342598 112
wolfSSL 0:9d17e4342598 113 result = (int)stream.total_out;
wolfSSL 0:9d17e4342598 114
wolfSSL 0:9d17e4342598 115 if (deflateEnd(&stream) != Z_OK)
wolfSSL 0:9d17e4342598 116 result = COMPRESS_E;
wolfSSL 0:9d17e4342598 117
wolfSSL 0:9d17e4342598 118 return result;
wolfSSL 0:9d17e4342598 119 }
wolfSSL 0:9d17e4342598 120
wolfSSL 0:9d17e4342598 121
wolfSSL 0:9d17e4342598 122 int DeCompress(byte* out, word32 outSz, const byte* in, word32 inSz)
wolfSSL 0:9d17e4342598 123 /*
wolfSSL 0:9d17e4342598 124 * out - pointer to destination buffer
wolfSSL 0:9d17e4342598 125 * outSz - size of destination buffer
wolfSSL 0:9d17e4342598 126 * in - pointer to source buffer to compress
wolfSSL 0:9d17e4342598 127 * inSz - size of source to compress
wolfSSL 0:9d17e4342598 128 * flags - flags to control how compress operates
wolfSSL 0:9d17e4342598 129 *
wolfSSL 0:9d17e4342598 130 * return:
wolfSSL 0:9d17e4342598 131 * negative - error code
wolfSSL 0:9d17e4342598 132 * positive - bytes stored in out buffer
wolfSSL 0:9d17e4342598 133 */
wolfSSL 0:9d17e4342598 134 {
wolfSSL 0:9d17e4342598 135 z_stream stream;
wolfSSL 0:9d17e4342598 136 int result = 0;
wolfSSL 0:9d17e4342598 137
wolfSSL 0:9d17e4342598 138 stream.next_in = (Bytef*)in;
wolfSSL 0:9d17e4342598 139 stream.avail_in = (uInt)inSz;
wolfSSL 0:9d17e4342598 140 /* Check for source > 64K on 16-bit machine: */
wolfSSL 0:9d17e4342598 141 if ((uLong)stream.avail_in != inSz) return DECOMPRESS_INIT_E;
wolfSSL 0:9d17e4342598 142
wolfSSL 0:9d17e4342598 143 stream.next_out = out;
wolfSSL 0:9d17e4342598 144 stream.avail_out = (uInt)outSz;
wolfSSL 0:9d17e4342598 145 if ((uLong)stream.avail_out != outSz) return DECOMPRESS_INIT_E;
wolfSSL 0:9d17e4342598 146
wolfSSL 0:9d17e4342598 147 stream.zalloc = (alloc_func)myAlloc;
wolfSSL 0:9d17e4342598 148 stream.zfree = (free_func)myFree;
wolfSSL 0:9d17e4342598 149 stream.opaque = (voidpf)0;
wolfSSL 0:9d17e4342598 150
wolfSSL 0:9d17e4342598 151 if (inflateInit2(&stream, DEFLATE_DEFAULT_WINDOWBITS) != Z_OK)
wolfSSL 0:9d17e4342598 152 return DECOMPRESS_INIT_E;
wolfSSL 0:9d17e4342598 153
wolfSSL 0:9d17e4342598 154 if (inflate(&stream, Z_FINISH) != Z_STREAM_END) {
wolfSSL 0:9d17e4342598 155 inflateEnd(&stream);
wolfSSL 0:9d17e4342598 156 return DECOMPRESS_E;
wolfSSL 0:9d17e4342598 157 }
wolfSSL 0:9d17e4342598 158
wolfSSL 0:9d17e4342598 159 result = (int)stream.total_out;
wolfSSL 0:9d17e4342598 160
wolfSSL 0:9d17e4342598 161 if (inflateEnd(&stream) != Z_OK)
wolfSSL 0:9d17e4342598 162 result = DECOMPRESS_E;
wolfSSL 0:9d17e4342598 163
wolfSSL 0:9d17e4342598 164 return result;
wolfSSL 0:9d17e4342598 165 }
wolfSSL 0:9d17e4342598 166
wolfSSL 0:9d17e4342598 167
wolfSSL 0:9d17e4342598 168 #endif /* HAVE_LIBZ */
wolfSSL 0:9d17e4342598 169