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Rev | Author | Line No. | Line |
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96 | giacomo | 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 2003-03-20 13:08:10 giacomo 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 | } |