ext: Replace gzstream with iostream3 from zlib to avoid LGPL

This patch replaces the gzstream zlib wrapper with the iostream3
wrapper provided as part of zlib contributions. The main reason for
the switch is to avoid including LGPL in the default gem5
build. iostream3 is provided under a more permissive license:

The code is provided "as is", with the permission to use, copy,
modify, distribute and sell it for any purpose without fee.

1 files changed, 0 insertions, 165 deletions

diff --git a/ext/gzstream/gzstream.cc b/ext/gzstream/gzstream.cc
deleted file mode 100644
index c804a33cb..000000000
--- a/ext/gzstream/gzstream.cc
+++ /dev/null
@@ -1,165 +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.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 //