97 lines
2.5 KiB
C++
97 lines
2.5 KiB
C++
/*
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* Copyright 2014-2019 Max Kellermann <max.kellermann@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "GunzipReader.hxx"
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#include "lib/zlib/Error.hxx"
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GunzipReader::GunzipReader(Reader &_next)
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:next(_next)
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{
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z.next_in = nullptr;
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z.avail_in = 0;
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z.zalloc = Z_NULL;
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z.zfree = Z_NULL;
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z.opaque = Z_NULL;
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int result = inflateInit2(&z, 16 + MAX_WBITS);
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if (result != Z_OK)
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throw ZlibError(result);
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}
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inline bool
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GunzipReader::FillBuffer()
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{
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auto w = buffer.Write();
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assert(!w.empty());
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size_t nbytes = next.Read(w.data, w.size);
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if (nbytes == 0)
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return false;
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buffer.Append(nbytes);
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return true;
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}
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size_t
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GunzipReader::Read(void *data, size_t size)
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{
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if (eof)
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return 0;
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z.next_out = (Bytef *)data;
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z.avail_out = size;
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while (true) {
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int flush = Z_NO_FLUSH;
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auto r = buffer.Read();
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if (r.empty()) {
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if (FillBuffer())
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r = buffer.Read();
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else
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flush = Z_FINISH;
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}
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z.next_in = r.data;
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z.avail_in = r.size;
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int result = inflate(&z, flush);
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if (result == Z_STREAM_END) {
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eof = true;
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return size - z.avail_out;
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} else if (result != Z_OK)
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throw ZlibError(result);
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buffer.Consume(r.size - z.avail_in);
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if (z.avail_out < size)
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return size - z.avail_out;
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}
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}
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