Ashley Mills / cyassl-lib

This is a port of cyaSSL 2.7.0.

Dependents:   CyaSSL_DTLS_Cellular CyaSSL_DTLS_Ethernet

ctaocrypt/src/compress.c@0:714293de3836, 2013-09-05 (annotated)

Committer:
ashleymills
Date:
Thu Sep 05 10:33:04 2013 +0000
Revision:
0:714293de3836
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ashleymills 0:714293de3836 1 /* compress.c
ashleymills 0:714293de3836 2 *
ashleymills 0:714293de3836 3 * Copyright (C) 2006-2013 wolfSSL Inc.
ashleymills 0:714293de3836 4 *
ashleymills 0:714293de3836 5 * This file is part of CyaSSL.
ashleymills 0:714293de3836 6 *
ashleymills 0:714293de3836 7 * CyaSSL is free software; you can redistribute it and/or modify
ashleymills 0:714293de3836 8 * it under the terms of the GNU General Public License as published by
ashleymills 0:714293de3836 9 * the Free Software Foundation; either version 2 of the License, or
ashleymills 0:714293de3836 10 * (at your option) any later version.
ashleymills 0:714293de3836 11 *
ashleymills 0:714293de3836 12 * CyaSSL is distributed in the hope that it will be useful,
ashleymills 0:714293de3836 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
ashleymills 0:714293de3836 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
ashleymills 0:714293de3836 15 * GNU General Public License for more details.
ashleymills 0:714293de3836 16 *
ashleymills 0:714293de3836 17 * You should have received a copy of the GNU General Public License
ashleymills 0:714293de3836 18 * along with this program; if not, write to the Free Software
ashleymills 0:714293de3836 19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
ashleymills 0:714293de3836 20 */
ashleymills 0:714293de3836 21
ashleymills 0:714293de3836 22
ashleymills 0:714293de3836 23 #ifdef HAVE_CONFIG_H
ashleymills 0:714293de3836 24 #include <config.h>
ashleymills 0:714293de3836 25 #endif
ashleymills 0:714293de3836 26
ashleymills 0:714293de3836 27 #include <cyassl/ctaocrypt/settings.h>
ashleymills 0:714293de3836 28
ashleymills 0:714293de3836 29 #ifdef HAVE_LIBZ
ashleymills 0:714293de3836 30
ashleymills 0:714293de3836 31
ashleymills 0:714293de3836 32 #include <cyassl/ctaocrypt/compress.h>
ashleymills 0:714293de3836 33 #include <cyassl/ctaocrypt/ctaoerror2.h>
ashleymills 0:714293de3836 34 #include <cyassl/ctaocrypt/logging.h>
ashleymills 0:714293de3836 35 #ifdef NO_INLINE
ashleymills 0:714293de3836 36 #include <cyassl/ctaocrypt/misc.h>
ashleymills 0:714293de3836 37 #else
ashleymills 0:714293de3836 38 #include <ctaocrypt/src/misc.c>
ashleymills 0:714293de3836 39 #endif
ashleymills 0:714293de3836 40
ashleymills 0:714293de3836 41 #include <zlib.h>
ashleymills 0:714293de3836 42
ashleymills 0:714293de3836 43
ashleymills 0:714293de3836 44 /* alloc user allocs to work with zlib */
ashleymills 0:714293de3836 45 static void* myAlloc(void* opaque, unsigned int item, unsigned int size)
ashleymills 0:714293de3836 46 {
ashleymills 0:714293de3836 47 (void)opaque;
ashleymills 0:714293de3836 48 return XMALLOC(item * size, opaque, DYNAMIC_TYPE_LIBZ);
ashleymills 0:714293de3836 49 }
ashleymills 0:714293de3836 50
ashleymills 0:714293de3836 51
ashleymills 0:714293de3836 52 static void myFree(void* opaque, void* memory)
ashleymills 0:714293de3836 53 {
ashleymills 0:714293de3836 54 (void)opaque;
ashleymills 0:714293de3836 55 XFREE(memory, opaque, DYNAMIC_TYPE_LIBZ);
ashleymills 0:714293de3836 56 }
ashleymills 0:714293de3836 57
ashleymills 0:714293de3836 58
ashleymills 0:714293de3836 59 #ifdef HAVE_MCAPI
ashleymills 0:714293de3836 60 #define DEFLATE_DEFAULT_WINDOWBITS 11
ashleymills 0:714293de3836 61 #define DEFLATE_DEFAULT_MEMLEVEL 1
ashleymills 0:714293de3836 62 #else
ashleymills 0:714293de3836 63 #define DEFLATE_DEFAULT_WINDOWBITS 15
ashleymills 0:714293de3836 64 #define DEFLATE_DEFAULT_MEMLEVEL 8
ashleymills 0:714293de3836 65 #endif
ashleymills 0:714293de3836 66
ashleymills 0:714293de3836 67
ashleymills 0:714293de3836 68 int Compress(byte* out, word32 outSz, const byte* in, word32 inSz, word32 flags)
ashleymills 0:714293de3836 69 /*
ashleymills 0:714293de3836 70 * out - pointer to destination buffer
ashleymills 0:714293de3836 71 * outSz - size of destination buffer
ashleymills 0:714293de3836 72 * in - pointer to source buffer to compress
ashleymills 0:714293de3836 73 * inSz - size of source to compress
ashleymills 0:714293de3836 74 * flags - flags to control how compress operates
ashleymills 0:714293de3836 75 *
ashleymills 0:714293de3836 76 * return:
ashleymills 0:714293de3836 77 * negative - error code
ashleymills 0:714293de3836 78 * positive - bytes stored in out buffer
ashleymills 0:714293de3836 79 *
ashleymills 0:714293de3836 80 * Note, the output buffer still needs to be larger than the input buffer.
ashleymills 0:714293de3836 81 * The right chunk of data won't compress at all, and the lookup table will
ashleymills 0:714293de3836 82 * add to the size of the output. The libz code says the compressed
ashleymills 0:714293de3836 83 * buffer should be srcSz + 0.1% + 12.
ashleymills 0:714293de3836 84 */
ashleymills 0:714293de3836 85 {
ashleymills 0:714293de3836 86 z_stream stream;
ashleymills 0:714293de3836 87 int result = 0;
ashleymills 0:714293de3836 88
ashleymills 0:714293de3836 89 stream.next_in = (Bytef*)in;
ashleymills 0:714293de3836 90 stream.avail_in = (uInt)inSz;
ashleymills 0:714293de3836 91 #ifdef MAXSEG_64K
ashleymills 0:714293de3836 92 /* Check for source > 64K on 16-bit machine: */
ashleymills 0:714293de3836 93 if ((uLong)stream.avail_in != inSz) return COMPRESS_INIT_E;
ashleymills 0:714293de3836 94 #endif
ashleymills 0:714293de3836 95 stream.next_out = out;
ashleymills 0:714293de3836 96 stream.avail_out = (uInt)outSz;
ashleymills 0:714293de3836 97 if ((uLong)stream.avail_out != outSz) return COMPRESS_INIT_E;
ashleymills 0:714293de3836 98
ashleymills 0:714293de3836 99 stream.zalloc = (alloc_func)myAlloc;
ashleymills 0:714293de3836 100 stream.zfree = (free_func)myFree;
ashleymills 0:714293de3836 101 stream.opaque = (voidpf)0;
ashleymills 0:714293de3836 102
ashleymills 0:714293de3836 103 if (deflateInit2(&stream, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
ashleymills 0:714293de3836 104 DEFLATE_DEFAULT_WINDOWBITS, DEFLATE_DEFAULT_MEMLEVEL,
ashleymills 0:714293de3836 105 flags ? Z_FIXED : Z_DEFAULT_STRATEGY) != Z_OK)
ashleymills 0:714293de3836 106 return COMPRESS_INIT_E;
ashleymills 0:714293de3836 107
ashleymills 0:714293de3836 108 if (deflate(&stream, Z_FINISH) != Z_STREAM_END) {
ashleymills 0:714293de3836 109 deflateEnd(&stream);
ashleymills 0:714293de3836 110 return COMPRESS_E;
ashleymills 0:714293de3836 111 }
ashleymills 0:714293de3836 112
ashleymills 0:714293de3836 113 result = (int)stream.total_out;
ashleymills 0:714293de3836 114
ashleymills 0:714293de3836 115 if (deflateEnd(&stream) != Z_OK)
ashleymills 0:714293de3836 116 result = COMPRESS_E;
ashleymills 0:714293de3836 117
ashleymills 0:714293de3836 118 return result;
ashleymills 0:714293de3836 119 }
ashleymills 0:714293de3836 120
ashleymills 0:714293de3836 121
ashleymills 0:714293de3836 122 int DeCompress(byte* out, word32 outSz, const byte* in, word32 inSz)
ashleymills 0:714293de3836 123 /*
ashleymills 0:714293de3836 124 * out - pointer to destination buffer
ashleymills 0:714293de3836 125 * outSz - size of destination buffer
ashleymills 0:714293de3836 126 * in - pointer to source buffer to compress
ashleymills 0:714293de3836 127 * inSz - size of source to compress
ashleymills 0:714293de3836 128 * flags - flags to control how compress operates
ashleymills 0:714293de3836 129 *
ashleymills 0:714293de3836 130 * return:
ashleymills 0:714293de3836 131 * negative - error code
ashleymills 0:714293de3836 132 * positive - bytes stored in out buffer
ashleymills 0:714293de3836 133 */
ashleymills 0:714293de3836 134 {
ashleymills 0:714293de3836 135 z_stream stream;
ashleymills 0:714293de3836 136 int result = 0;
ashleymills 0:714293de3836 137
ashleymills 0:714293de3836 138 stream.next_in = (Bytef*)in;
ashleymills 0:714293de3836 139 stream.avail_in = (uInt)inSz;
ashleymills 0:714293de3836 140 /* Check for source > 64K on 16-bit machine: */
ashleymills 0:714293de3836 141 if ((uLong)stream.avail_in != inSz) return DECOMPRESS_INIT_E;
ashleymills 0:714293de3836 142
ashleymills 0:714293de3836 143 stream.next_out = out;
ashleymills 0:714293de3836 144 stream.avail_out = (uInt)outSz;
ashleymills 0:714293de3836 145 if ((uLong)stream.avail_out != outSz) return DECOMPRESS_INIT_E;
ashleymills 0:714293de3836 146
ashleymills 0:714293de3836 147 stream.zalloc = (alloc_func)myAlloc;
ashleymills 0:714293de3836 148 stream.zfree = (free_func)myFree;
ashleymills 0:714293de3836 149 stream.opaque = (voidpf)0;
ashleymills 0:714293de3836 150
ashleymills 0:714293de3836 151 if (inflateInit2(&stream, DEFLATE_DEFAULT_WINDOWBITS) != Z_OK)
ashleymills 0:714293de3836 152 return DECOMPRESS_INIT_E;
ashleymills 0:714293de3836 153
ashleymills 0:714293de3836 154 if (inflate(&stream, Z_FINISH) != Z_STREAM_END) {
ashleymills 0:714293de3836 155 inflateEnd(&stream);
ashleymills 0:714293de3836 156 return DECOMPRESS_E;
ashleymills 0:714293de3836 157 }
ashleymills 0:714293de3836 158
ashleymills 0:714293de3836 159 result = (int)stream.total_out;
ashleymills 0:714293de3836 160
ashleymills 0:714293de3836 161 if (inflateEnd(&stream) != Z_OK)
ashleymills 0:714293de3836 162 result = DECOMPRESS_E;
ashleymills 0:714293de3836 163
ashleymills 0:714293de3836 164 return result;
ashleymills 0:714293de3836 165 }
ashleymills 0:714293de3836 166
ashleymills 0:714293de3836 167
ashleymills 0:714293de3836 168 #endif /* HAVE_LIBZ */
ashleymills 0:714293de3836 169