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+/* uncompr.c -- decompress a memory buffer
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+ * Copyright (C) 1995-2003, 2010, 2014, 2016 Jean-loup Gailly, Mark Adler
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+ * For conditions of distribution and use, see copyright notice in zlib.h
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+ */
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+
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+/* @(#) $Id$ */
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+
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+#define ZLIB_INTERNAL
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+#include "zlib.h"
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+
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+/* ===========================================================================
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+ Decompresses the source buffer into the destination buffer. *sourceLen is
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+ the byte length of the source buffer. Upon entry, *destLen is the total size
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+ of the destination buffer, which must be large enough to hold the entire
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+ uncompressed data. (The size of the uncompressed data must have been saved
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+ previously by the compressor and transmitted to the decompressor by some
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+ mechanism outside the scope of this compression library.) Upon exit,
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+ *destLen is the size of the decompressed data and *sourceLen is the number
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+ of source bytes consumed. Upon return, source + *sourceLen points to the
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+ first unused input byte.
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+
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+ uncompress returns Z_OK if success, Z_MEM_ERROR if there was not enough
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+ memory, Z_BUF_ERROR if there was not enough room in the output buffer, or
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+ Z_DATA_ERROR if the input data was corrupted, including if the input data is
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+ an incomplete zlib stream.
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+*/
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+int ZEXPORT uncompress2(dest, destLen, source, sourceLen)
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+ Bytef *dest;
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+ uLongf *destLen;
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+ const Bytef *source;
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+ uLong *sourceLen;
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+
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+{
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+ z_stream stream;
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+ int err;
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+ const uInt max = (uInt)-1;
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+ uLong len, left;
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+ /* for detection of incomplete stream when *destLen == 0 */
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+ Byte buf[1];
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+
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+ len = *sourceLen;
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+ if (*destLen) {
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+ left = *destLen;
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+ *destLen = 0;
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+ } else {
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+ left = 1;
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+ dest = buf;
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+ }
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+
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+ stream.next_in = (z_const Bytef *)source;
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+ stream.avail_in = 0;
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+ stream.zalloc = (alloc_func)0;
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+ stream.zfree = (free_func)0;
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+ stream.opaque = (voidpf)0;
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+
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+ err = inflateInit(&stream);
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+ if (err != Z_OK)
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+ return err;
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+
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+ stream.next_out = dest;
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+ stream.avail_out = 0;
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+
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+ do {
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+ if (stream.avail_out == 0) {
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+ stream.avail_out = left > (uLong)max ? max : (uInt)left;
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+ left -= stream.avail_out;
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+ }
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+
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+ if (stream.avail_in == 0) {
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+ stream.avail_in = len > (uLong)max ? max : (uInt)len;
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+ len -= stream.avail_in;
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+ }
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+
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+ err = inflate(&stream, Z_NO_FLUSH);
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+ } while (err == Z_OK);
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+
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+ *sourceLen -= len + stream.avail_in;
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+ if (dest != buf)
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+ *destLen = stream.total_out;
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+ else if (stream.total_out && err == Z_BUF_ERROR)
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+ left = 1;
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+
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+ inflateEnd(&stream);
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+ return err == Z_STREAM_END ? Z_OK :
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+ err == Z_NEED_DICT ? Z_DATA_ERROR :
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+ err == Z_BUF_ERROR && left + stream.avail_out ? Z_DATA_ERROR :
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+ err;
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+}
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+
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+int ZEXPORT uncompress(dest, destLen, source, sourceLen)
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+ Bytef *dest;
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+ uLongf *destLen;
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+ const Bytef *source;
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+ uLong sourceLen;
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+{
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+ return uncompress2(dest, destLen, source, &sourceLen);
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+}
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