Gabriele Cosmo
108 lines
2.7 KiB
Plaintext
108 lines
2.7 KiB
Plaintext
// Copyright (C) 2010, Guy Barrand. All rights reserved.
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// See the file tools.license for terms.
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#ifndef tools_gzip_buffer
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#define tools_gzip_buffer
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// what is needed for root file compression with zlib.
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// The gzip library is libz.
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// Someone must not confuse zlib with zip.
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// In particular to use zip someone has to
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// link to -lz that contains inflate, deflate.
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#include <zlib.h>
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#include <ostream>
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namespace tools {
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inline bool gzip_buffer(std::ostream& a_out,
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unsigned int a_level,
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unsigned int a_srcsize,const char* a_src,
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unsigned int a_tgtsize,char* a_tgt,
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unsigned int& a_irep) {
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z_stream stream; // decompression stream
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stream.next_in = (Bytef*)(a_src);
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stream.avail_in = (uInt)(a_srcsize);
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stream.next_out = (Bytef*)a_tgt;
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stream.avail_out = (uInt)(a_tgtsize);
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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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int err = deflateInit(&stream,a_level);
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if(err!=Z_OK) {
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a_out << "tools::wroot::zip :"
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<< " error in zlib/deflateInit." << std::endl;
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a_irep = 0;
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return false;
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}
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err = deflate(&stream, Z_FINISH);
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if(err!=Z_STREAM_END) {
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deflateEnd(&stream);
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a_out << "tools::wroot::zip :"
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<< " error in zlib/deflate." << std::endl;
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a_irep = 0;
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return false;
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}
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deflateEnd(&stream);
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//a_out << "tools::gzip_buffer : ok "
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// << stream.total_out << std::endl;
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a_irep = stream.total_out;
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return true;
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}
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inline bool gunzip_buffer(std::ostream& a_out,
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unsigned int a_srcsize,const char* a_src,
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unsigned int a_tgtsize,char* a_tgt,
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unsigned int& a_irep) {
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z_stream stream; // decompression stream
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stream.next_in = (Bytef*)(a_src);
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stream.avail_in = (uInt)(a_srcsize);
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stream.next_out = (Bytef*)a_tgt;
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stream.avail_out = (uInt)(a_tgtsize);
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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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int err = inflateInit(&stream);
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if (err != Z_OK) {
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a_out << "tools::gunzip_buffer :"
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<< " error " << err << " in zlib/inflateInit." << std::endl;
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return false;
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}
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err = inflate(&stream, Z_FINISH);
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if (err != Z_STREAM_END) {
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inflateEnd(&stream);
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a_out << "tools::gunzip_buffer :"
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<< " error " << err << " in zlib/inflate." << std::endl;
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return false;
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}
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inflateEnd(&stream);
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//a_out << "tools::gunzip_buffer : zlib : ok "
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// << stream.total_out << std::endl;
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a_irep = stream.total_out;
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return true;
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}
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}
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#endif
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//exlib_build_use inlib zlib
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