Rev 107 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 107 | pj | 1 | /* compress.c -- compress a memory buffer |
| 2 | * Copyright (C) 1995-2002 Jean-loup Gailly. |
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| 3 | * For conditions of distribution and use, see copyright notice in zlib.h |
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| 4 | */ |
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| 5 | |||
| 6 | /* @(#) $Id: compress.c,v 1.1 2003-03-24 11:13:44 pj Exp $ */ |
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| 7 | |||
| 8 | #include "zlib.h" |
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| 9 | |||
| 10 | /* =========================================================================== |
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| 11 | Compresses the source buffer into the destination buffer. The level |
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| 12 | parameter has the same meaning as in deflateInit. sourceLen is the byte |
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| 13 | length of the source buffer. Upon entry, destLen is the total size of the |
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| 14 | destination buffer, which must be at least 0.1% larger than sourceLen plus |
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| 15 | 12 bytes. Upon exit, destLen is the actual size of the compressed buffer. |
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| 16 | |||
| 17 | compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough |
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| 18 | memory, Z_BUF_ERROR if there was not enough room in the output buffer, |
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| 19 | Z_STREAM_ERROR if the level parameter is invalid. |
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| 20 | */ |
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| 21 | int ZEXPORT compress2 (dest, destLen, source, sourceLen, level) |
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| 22 | Bytef *dest; |
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| 23 | uLongf *destLen; |
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| 24 | const Bytef *source; |
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| 25 | uLong sourceLen; |
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| 26 | int level; |
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| 27 | { |
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| 28 | z_stream stream; |
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| 29 | int err; |
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| 30 | |||
| 31 | stream.next_in = (Bytef*)source; |
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| 32 | stream.avail_in = (uInt)sourceLen; |
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| 33 | #ifdef MAXSEG_64K |
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| 34 | /* Check for source > 64K on 16-bit machine: */ |
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| 35 | if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR; |
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| 36 | #endif |
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| 37 | stream.next_out = dest; |
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| 38 | stream.avail_out = (uInt)*destLen; |
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| 39 | if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR; |
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| 40 | |||
| 41 | stream.zalloc = (alloc_func)0; |
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| 42 | stream.zfree = (free_func)0; |
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| 43 | stream.opaque = (voidpf)0; |
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| 44 | |||
| 45 | err = deflateInit(&stream, level); |
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| 46 | if (err != Z_OK) return err; |
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| 47 | |||
| 48 | err = deflate(&stream, Z_FINISH); |
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| 49 | if (err != Z_STREAM_END) { |
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| 50 | deflateEnd(&stream); |
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| 51 | return err == Z_OK ? Z_BUF_ERROR : err; |
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| 52 | } |
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| 53 | *destLen = stream.total_out; |
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| 54 | |||
| 55 | err = deflateEnd(&stream); |
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| 56 | return err; |
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| 57 | } |
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| 58 | |||
| 59 | /* =========================================================================== |
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| 60 | */ |
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| 61 | int ZEXPORT compress (dest, destLen, source, sourceLen) |
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| 62 | Bytef *dest; |
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| 63 | uLongf *destLen; |
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| 64 | const Bytef *source; |
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| 65 | uLong sourceLen; |
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| 66 | { |
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| 67 | return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION); |
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| 68 | } |