Mercurial > repos > blastem
annotate zlib/compress.c @ 1937:cafde1255ad3 mame_interp
Fix resuming 68K core when using interpreter
author | Michael Pavone <pavone@retrodev.com> |
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date | Sun, 19 Apr 2020 00:59:49 -0700 |
parents | 00d788dac91a |
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1 /* compress.c -- compress a memory buffer |
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2 * Copyright (C) 1995-2005, 2014, 2016 Jean-loup Gailly, Mark Adler |
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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 |
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6 /* @(#) $Id$ */ |
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7 |
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8 #define ZLIB_INTERNAL |
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9 #include "zlib.h" |
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10 |
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11 /* =========================================================================== |
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12 Compresses the source buffer into the destination buffer. The level |
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13 parameter has the same meaning as in deflateInit. sourceLen is the byte |
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14 length of the source buffer. Upon entry, destLen is the total size of the |
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15 destination buffer, which must be at least 0.1% larger than sourceLen plus |
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16 12 bytes. Upon exit, destLen is the actual size of the compressed buffer. |
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17 |
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18 compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough |
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19 memory, Z_BUF_ERROR if there was not enough room in the output buffer, |
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20 Z_STREAM_ERROR if the level parameter is invalid. |
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21 */ |
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22 int ZEXPORT compress2 (dest, destLen, source, sourceLen, level) |
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23 Bytef *dest; |
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24 uLongf *destLen; |
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25 const Bytef *source; |
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26 uLong sourceLen; |
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27 int level; |
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28 { |
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29 z_stream stream; |
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30 int err; |
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31 const uInt max = (uInt)-1; |
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32 uLong left; |
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33 |
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34 left = *destLen; |
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35 *destLen = 0; |
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36 |
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37 stream.zalloc = (alloc_func)0; |
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38 stream.zfree = (free_func)0; |
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39 stream.opaque = (voidpf)0; |
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40 |
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41 err = deflateInit(&stream, level); |
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42 if (err != Z_OK) return err; |
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43 |
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44 stream.next_out = dest; |
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45 stream.avail_out = 0; |
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46 stream.next_in = (z_const Bytef *)source; |
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47 stream.avail_in = 0; |
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48 |
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49 do { |
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50 if (stream.avail_out == 0) { |
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51 stream.avail_out = left > (uLong)max ? max : (uInt)left; |
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52 left -= stream.avail_out; |
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53 } |
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54 if (stream.avail_in == 0) { |
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55 stream.avail_in = sourceLen > (uLong)max ? max : (uInt)sourceLen; |
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56 sourceLen -= stream.avail_in; |
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57 } |
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58 err = deflate(&stream, sourceLen ? Z_NO_FLUSH : Z_FINISH); |
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59 } while (err == Z_OK); |
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60 |
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61 *destLen = stream.total_out; |
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62 deflateEnd(&stream); |
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63 return err == Z_STREAM_END ? Z_OK : err; |
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64 } |
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65 |
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66 /* =========================================================================== |
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67 */ |
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68 int ZEXPORT compress (dest, destLen, source, sourceLen) |
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69 Bytef *dest; |
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70 uLongf *destLen; |
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71 const Bytef *source; |
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72 uLong sourceLen; |
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73 { |
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74 return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION); |
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75 } |
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76 |
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77 /* =========================================================================== |
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78 If the default memLevel or windowBits for deflateInit() is changed, then |
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79 this function needs to be updated. |
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80 */ |
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81 uLong ZEXPORT compressBound (sourceLen) |
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82 uLong sourceLen; |
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83 { |
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84 return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) + |
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85 (sourceLen >> 25) + 13; |
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86 } |