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1 /* Portions Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 * All rights reserved. |
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3 */ |
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4 |
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5 /* compress.cpp -- compress a memory buffer |
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6 * Copyright (C) 1995-2003 Jean-loup Gailly. |
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7 * For conditions of distribution and use, see copyright notice in zlib.h |
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8 */ |
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9 |
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10 /* @(#) $Id$ */ |
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11 |
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12 #define ZLIB_INTERNAL |
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13 #include "libzcore.h" |
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14 |
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15 /* =========================================================================== |
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16 Compresses the source buffer into the destination buffer. The level |
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17 parameter has the same meaning as in deflateInit. sourceLen is the byte |
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18 length of the source buffer. Upon entry, destLen is the total size of the |
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19 destination buffer, which must be at least 0.1% larger than sourceLen plus |
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20 12 bytes. Upon exit, destLen is the actual size of the compressed buffer. |
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21 |
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22 compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough |
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23 memory, Z_BUF_ERROR if there was not enough room in the output buffer, |
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24 Z_STREAM_ERROR if the level parameter is invalid. |
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25 */ |
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26 |
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27 #ifdef __SYMBIAN32__ |
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28 EXPORT_C int compress2_r (Bytef * dest, uLongf * destLen,const Bytef * source,uLong sourceLen,int level) |
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29 #else |
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30 int ZEXPORT compress2 (dest, destLen, source, sourceLen, level) |
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31 Bytef *dest; |
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32 uLongf *destLen; |
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33 const Bytef *source; |
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34 uLong sourceLen; |
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35 int level; |
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36 #endif //__SYMBIAN32__ |
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37 { |
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38 z_stream stream; |
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39 int err; |
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40 |
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41 stream.next_in = (Bytef*)source; |
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42 stream.avail_in = (uInt)sourceLen; |
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43 #ifdef MAXSEG_64K |
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44 /* Check for source > 64K on 16-bit machine: */ |
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45 if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR; |
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46 #endif |
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47 stream.next_out = dest; |
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48 stream.avail_out = (uInt)*destLen; |
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49 if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR; |
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50 |
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51 stream.zalloc = (alloc_func)0; |
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52 stream.zfree = (free_func)0; |
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53 stream.opaque = (voidpf)0; |
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54 |
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55 err = deflateInit_r(&stream, level); |
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56 if (err != Z_OK) return err; |
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57 |
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58 err = deflate_r(&stream, Z_FINISH); |
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59 if (err != Z_STREAM_END) { |
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60 deflateEnd_r(&stream); |
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61 return err == Z_OK ? Z_BUF_ERROR : err; |
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62 } |
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63 *destLen = stream.total_out; |
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64 |
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65 err = deflateEnd_r(&stream); |
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66 return err; |
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67 } |
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68 |
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69 /* =========================================================================== |
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70 */ |
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71 |
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72 #ifdef __SYMBIAN32__ |
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73 EXPORT_C int compress_r (Bytef * dest, uLongf * destLen, const Bytef * source, uLong sourceLen) |
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74 #else |
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75 int ZEXPORT compress (dest, destLen, source, sourceLen) |
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76 Bytef *dest; |
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77 uLongf *destLen; |
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78 const Bytef *source; |
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79 uLong sourceLen; |
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80 #endif //__SYMBIAN32__ |
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81 { |
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82 return compress2_r(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION); |
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83 } |
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84 |
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85 |
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86 /* =========================================================================== |
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87 If the default memLevel or windowBits for deflateInit() is changed, then |
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88 this function needs to be updated. |
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89 */ |
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90 |
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91 |
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92 #ifdef __SYMBIAN32__ |
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93 EXPORT_C uLong compressBound_r (uLong sourceLen) |
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94 #else |
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95 uLong ZEXPORT compressBound (sourceLen) |
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96 uLong sourceLen; |
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97 #endif //__SYMBIAN32__ |
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98 { |
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99 return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) + 11; |
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100 } |
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101 |
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102 |
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103 |