diff options
Diffstat (limited to 'decoder/gzstream.cc')
| -rw-r--r-- | decoder/gzstream.cc | 182 |
1 files changed, 0 insertions, 182 deletions
diff --git a/decoder/gzstream.cc b/decoder/gzstream.cc deleted file mode 100644 index 88cd1bd2..00000000 --- a/decoder/gzstream.cc +++ /dev/null @@ -1,182 +0,0 @@ -// ============================================================================ -// gzstream, C++ iostream classes wrapping the zlib compression library. -// Copyright (C) 2001 Deepak Bandyopadhyay, Lutz Kettner -// -// This library is free software; you can redistribute it and/or -// modify it under the terms of the GNU Lesser General Public -// License as published by the Free Software Foundation; either -// version 2.1 of the License, or (at your option) any later version. -// -// This library is distributed in the hope that it will be useful, -// but WITHOUT ANY WARRANTY; without even the implied warranty of -// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -// Lesser General Public License for more details. -// -// You should have received a copy of the GNU Lesser General Public -// License along with this library; if not, write to the Free Software -// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA -// ============================================================================ -// -// File : gzstream.C -// Revision : $Revision: 1.7 $ -// Revision_date : $Date: 2003/01/08 14:41:27 $ -// Author(s) : Deepak Bandyopadhyay, Lutz Kettner -// -// Standard streambuf implementation following Nicolai Josuttis, "The -// Standard C++ Library". -// ============================================================================ - -#include <gzstream.h> -#include <iostream> -#include <cstring> // for memcpy -#include <stdexcept> - -#ifdef GZSTREAM_NAMESPACE -namespace GZSTREAM_NAMESPACE { -#endif - -// ---------------------------------------------------------------------------- -// Internal classes to implement gzstream. See header file for user classes. -// ---------------------------------------------------------------------------- - -// -------------------------------------- -// class gzstreambuf: -// -------------------------------------- - -gzstreambuf* gzstreambuf::open( const char* name, int open_mode) { - if ( is_open()) - return (gzstreambuf*)0; - mode = open_mode; - // no append nor read/write mode - if ((mode & std::ios::ate) || (mode & std::ios::app) - || ((mode & std::ios::in) && (mode & std::ios::out))) - return (gzstreambuf*)0; - const int Nmode=10; - char fmode[Nmode]; - char* fmodeptr = fmode; - if ( mode & std::ios::in) - *fmodeptr++ = 'r'; - else if ( mode & std::ios::out) - *fmodeptr++ = 'w'; - *fmodeptr++ = 'b'; - while (fmodeptr<fmode+Nmode) // hopefully wil help valgrind - *fmodeptr++ = '\0'; - file = gzopen( name, fmode); - if (!file) handle_gzerror(); - if (file == 0) - return (gzstreambuf*)0; - opened = 1; - return this; -} - -gzstreambuf * gzstreambuf::close() { - if ( is_open()) { - sync(); - opened = 0; - if ( gzclose( file) == Z_OK) - return this; - else - handle_gzerror(); - } - return (gzstreambuf*)0; -} - -void gzstreambuf::handle_gzerror() { - int errnum; - const char *errmsg=gzerror(file,&errnum); - if (errnum==Z_DATA_ERROR) errmsg="CRC error reading gzip"; - throw std::runtime_error(std::string("gzstreambuf error: ")+errmsg); -} - -int gzstreambuf::underflow() { // used for input buffer only - if ( gptr() && ( gptr() < egptr())) - return * reinterpret_cast<unsigned char *>( gptr()); - - if ( ! (mode & std::ios::in) || ! opened) - return EOF; - // Josuttis' implementation of inbuf - int n_putback = gptr() - eback(); - if ( n_putback > 4) - n_putback = 4; - std::memcpy( buffer + (4 - n_putback), gptr() - n_putback, n_putback); - - int num = gzread( file, buffer+4, bufferSize-4); - if (num <= 0) // ERROR or EOF - { - if (gzeof(file)) - return EOF; - handle_gzerror(); - } - - // reset buffer pointers - setg( buffer + (4 - n_putback), // beginning of putback area - buffer + 4, // read position - buffer + 4 + num); // end of buffer - - // return next character - return * reinterpret_cast<unsigned char *>( gptr()); -} - -int gzstreambuf::flush_buffer() { - // Separate the writing of the buffer from overflow() and - // sync() operation. - int w = pptr() - pbase(); - if ( gzwrite( file, pbase(), w) != w) - handle_gzerror(); - pbump( -w); - return w; -} - -int gzstreambuf::overflow( int c) { // used for output buffer only - if ( ! ( mode & std::ios::out) || ! opened) - return EOF; - if (c != EOF) { - *pptr() = c; - pbump(1); - } - if ( flush_buffer() == EOF) - return EOF; - return c; -} - -int gzstreambuf::sync() { - // Changed to use flush_buffer() instead of overflow( EOF) - // which caused improper behavior with std::endl and flush(), - // bug reported by Vincent Ricard. - if ( pptr() && pptr() > pbase()) { - if ( flush_buffer() == EOF) - return -1; - } - return 0; -} - -// -------------------------------------- -// class gzstreambase: -// -------------------------------------- - -gzstreambase::gzstreambase( const char* name, int mode) { - init( &buf); - open( name, mode); -} - -gzstreambase::~gzstreambase() { - buf.close(); -} - -void gzstreambase::open( const char* name, int open_mode) { - if ( ! buf.open( name, open_mode)) - clear( rdstate() | std::ios::badbit); -} - -void gzstreambase::close() { - if ( buf.is_open()) - if ( ! buf.close()) - clear( rdstate() | std::ios::badbit); -} - -#ifdef GZSTREAM_NAMESPACE -} // namespace GZSTREAM_NAMESPACE -#endif - -// ============================================================================ -// EOF // |