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+// ============================================================================
+// 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: 1.1 $
+// Revision_date : $Date: 2006/03/30 04:05:52 $
+// Author(s) : Deepak Bandyopadhyay, Lutz Kettner
+//
+// Standard streambuf implementation following Nicolai Josuttis, "The
+// Standard C++ Library".
+// ============================================================================
+
+#include "gzstream.hh"
+#include <iostream>
+#include <string.h> // for memcpy
+
+#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;
+ char fmode[10];
+ char* fmodeptr = fmode;
+ if ( mode & std::ios::in)
+ *fmodeptr++ = 'r';
+ else if ( mode & std::ios::out)
+ *fmodeptr++ = 'w';
+ *fmodeptr++ = 'b';
+ *fmodeptr = '\0';
+ file = gzopen( name, fmode);
+ 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;
+ }
+ return (gzstreambuf*)0;
+}
+
+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;
+ memcpy( buffer + (4 - n_putback), gptr() - n_putback, n_putback);
+
+ int num = gzread( file, buffer+4, bufferSize-4);
+ if (num <= 0) // ERROR or EOF
+ return EOF;
+
+ // 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)
+ return EOF;
+ 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 //