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Add zlib LICENSE file to zlib subdir
author Michael Pavone <pavone@retrodev.com>
date Sun, 15 Jun 2025 15:41:38 -0700
parents 9ef72ee5c0b0
children
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1 /* uncompr.c -- decompress a memory buffer
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2 * Copyright (C) 1995-2003, 2010, 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 Decompresses the source buffer into the destination buffer. *sourceLen is
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13 the byte length of the source buffer. Upon entry, *destLen is the total size
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14 of the destination buffer, which must be large enough to hold the entire
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15 uncompressed data. (The size of the uncompressed data must have been saved
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16 previously by the compressor and transmitted to the decompressor by some
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17 mechanism outside the scope of this compression library.) Upon exit,
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18 *destLen is the size of the decompressed data and *sourceLen is the number
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19 of source bytes consumed. Upon return, source + *sourceLen points to the
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20 first unused input byte.
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21
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22 uncompress 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, or
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24 Z_DATA_ERROR if the input data was corrupted, including if the input data is
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25 an incomplete zlib stream.
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26 */
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27 int ZEXPORT uncompress2(Bytef *dest, uLongf *destLen, const Bytef *source,
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28 uLong *sourceLen) {
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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 len, left;
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33 Byte buf[1]; /* for detection of incomplete stream when *destLen == 0 */
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34
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35 len = *sourceLen;
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36 if (*destLen) {
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37 left = *destLen;
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38 *destLen = 0;
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39 }
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40 else {
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41 left = 1;
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42 dest = buf;
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43 }
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44
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45 stream.next_in = (z_const Bytef *)source;
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46 stream.avail_in = 0;
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47 stream.zalloc = (alloc_func)0;
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48 stream.zfree = (free_func)0;
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49 stream.opaque = (voidpf)0;
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50
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51 err = inflateInit(&stream);
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52 if (err != Z_OK) return err;
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53
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54 stream.next_out = dest;
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55 stream.avail_out = 0;
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56
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57 do {
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58 if (stream.avail_out == 0) {
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59 stream.avail_out = left > (uLong)max ? max : (uInt)left;
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60 left -= stream.avail_out;
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61 }
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62 if (stream.avail_in == 0) {
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63 stream.avail_in = len > (uLong)max ? max : (uInt)len;
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64 len -= stream.avail_in;
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65 }
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66 err = inflate(&stream, Z_NO_FLUSH);
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67 } while (err == Z_OK);
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68
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69 *sourceLen -= len + stream.avail_in;
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70 if (dest != buf)
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71 *destLen = stream.total_out;
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72 else if (stream.total_out && err == Z_BUF_ERROR)
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73 left = 1;
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74
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75 inflateEnd(&stream);
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76 return err == Z_STREAM_END ? Z_OK :
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77 err == Z_NEED_DICT ? Z_DATA_ERROR :
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78 err == Z_BUF_ERROR && left + stream.avail_out ? Z_DATA_ERROR :
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79 err;
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80 }
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81
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82 int ZEXPORT uncompress(Bytef *dest, uLongf *destLen, const Bytef *source,
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83 uLong sourceLen) {
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84 return uncompress2(dest, destLen, source, &sourceLen);
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85 }