93 lines
2.4 KiB
C++
93 lines
2.4 KiB
C++
// include/Gunzipper.hh
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// This file is part of libpbe; see http://svn.chezphil.org/libpbe/
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// (C) 2008 Philip Endecott
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#ifndef pbe_Gunzipper_hh
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#define pbe_Gunzipper_hh
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#include <zlib.h>
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#include <string>
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namespace pbe {
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class Gunzipper {
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z_stream_s gz;
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public:
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Gunzipper() {
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gz.zalloc = Z_NULL;
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gz.zfree = Z_NULL;
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gz.opaque = Z_NULL;
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gz.next_in = Z_NULL;
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gz.avail_in = 0;
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int r = inflateInit2(&gz, 15+32); // 15 = windowbits; this is the default;
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// adding 32 (ARGH!) magically makes it
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// recognise both zlib and gzip formats
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// (you didn't even know they differed, right?)
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switch (r) {
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case Z_MEM_ERROR: throw std::bad_alloc();
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case Z_VERSION_ERROR: throw "Z_VERSION_ERROR";
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}
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}
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~Gunzipper() {
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inflateEnd(&gz);
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}
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struct InvalidData {};
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std::string operator()(const char* in, size_t in_bytes) {
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gz.next_in = reinterpret_cast<Bytef*>(const_cast<char*>(in));
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gz.avail_in = in_bytes;
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std::string out;
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while (gz.avail_in>0 || gz.avail_out==0) {
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char buffer[4096];
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gz.next_out = reinterpret_cast<Bytef*>(buffer);
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gz.avail_out = sizeof(buffer);
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int r = inflate(&gz,Z_SYNC_FLUSH);
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switch (r) {
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case Z_NEED_DICT: throw "Z_NEED_DICT";
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case Z_DATA_ERROR: throw InvalidData();
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case Z_STREAM_ERROR: throw InvalidData();
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case Z_MEM_ERROR: throw std::bad_alloc();
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}
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out.append(buffer,sizeof(buffer)-gz.avail_out);
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if (r==Z_STREAM_END) {
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break;
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}
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}
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return out;
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}
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std::string operator()(std::string in) {
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return operator()(in.data(),in.length());
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}
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};
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};
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#endif
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