498 lines
11 KiB
C++
498 lines
11 KiB
C++
// lowlevel.cxx -- routines to handle lowlevel compressed binary IO of
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// various datatypes
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//
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// Shamelessly adapted from plib (plib.sourceforge.net) January 2001
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//
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// Original version Copyright (C) 2000 the plib team
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// Local changes Copyright (C) 2000 Curtis L. Olson - curt@flightgear.org
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//
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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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// (at your option) 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., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id$
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#include <string.h> // for memcpy()
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#include "lowlevel.hxx"
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static int read_error = false ;
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static int write_error = false ;
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void sgClearReadError() { read_error = false; }
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void sgClearWriteError() { write_error = false; }
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int sgReadError() { return read_error ; }
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int sgWriteError() { return write_error ; }
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void sgReadChar ( gzFile fd, char *var )
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{
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if ( gzread ( fd, var, sizeof(char) ) != sizeof(char) ) {
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read_error = true ;
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}
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}
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void sgWriteChar ( gzFile fd, const char var )
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{
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if ( gzwrite ( fd, (void *)(&var), sizeof(char) ) != sizeof(char) ) {
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write_error = true ;
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}
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}
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void sgReadFloat ( gzFile fd, float *var )
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{
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if ( gzread ( fd, var, sizeof(float) ) != sizeof(float) ) {
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read_error = true ;
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}
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if ( sgIsBigEndian() ) {
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sgEndianSwap( (unsigned int*)var);
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}
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}
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void sgWriteFloat ( gzFile fd, const float var )
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{
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if ( sgIsBigEndian() ) {
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sgEndianSwap( (unsigned int*)&var);
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}
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if ( gzwrite ( fd, (void *)(&var), sizeof(float) ) != sizeof(float) ) {
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write_error = true ;
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}
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}
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void sgReadDouble ( gzFile fd, double *var )
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{
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if ( gzread ( fd, var, sizeof(double) ) != sizeof(double) ) {
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read_error = true ;
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}
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if ( sgIsBigEndian() ) {
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sgEndianSwap( (uint64*)var);
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}
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}
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void sgWriteDouble ( gzFile fd, const double var )
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{
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if ( sgIsBigEndian() ) {
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sgEndianSwap( (uint64*)&var);
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}
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if ( gzwrite ( fd, (void *)(&var), sizeof(double) ) != sizeof(double) ) {
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write_error = true ;
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}
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}
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void sgReadUInt ( gzFile fd, unsigned int *var )
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{
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if ( gzread ( fd, var, sizeof(unsigned int) ) != sizeof(unsigned int) ) {
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read_error = true ;
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}
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if ( sgIsBigEndian() ) {
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sgEndianSwap( (unsigned int*)var);
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}
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}
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void sgWriteUInt ( gzFile fd, const unsigned int var )
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{
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if ( sgIsBigEndian() ) {
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sgEndianSwap( (unsigned int*)&var);
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}
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if ( gzwrite ( fd, (void *)(&var), sizeof(unsigned int) )
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!= sizeof(unsigned int) )
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{
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write_error = true ;
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}
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}
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void sgReadInt ( gzFile fd, int *var )
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{
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if ( gzread ( fd, var, sizeof(int) ) != sizeof(int) ) {
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read_error = true ;
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}
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if ( sgIsBigEndian() ) {
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sgEndianSwap( (unsigned int*)var);
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}
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}
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void sgWriteInt ( gzFile fd, const int var )
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{
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if ( sgIsBigEndian() ) {
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sgEndianSwap( (unsigned int*)&var);
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}
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if ( gzwrite ( fd, (void *)(&var), sizeof(int) ) != sizeof(int) ) {
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write_error = true ;
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}
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}
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void sgReadLong ( gzFile fd, long int *var )
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{
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if ( gzread ( fd, var, sizeof(long int) ) != sizeof(long int) ) {
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read_error = true ;
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}
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if ( sgIsBigEndian() ) {
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sgEndianSwap( (unsigned int*)var);
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}
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}
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void sgWriteLong ( gzFile fd, const long int var )
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{
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if ( sgIsBigEndian() ) {
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sgEndianSwap( (unsigned int*)&var);
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}
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if ( gzwrite ( fd, (void *)(&var), sizeof(long int) )
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!= sizeof(long int) )
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{
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write_error = true ;
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}
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}
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void sgReadLongLong ( gzFile fd, int64 *var )
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{
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if ( gzread ( fd, var, sizeof(int64) ) != sizeof(int64) ) {
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read_error = true ;
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}
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if ( sgIsBigEndian() ) {
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sgEndianSwap( (uint64*)var);
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}
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}
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void sgWriteLongLong ( gzFile fd, const int64 var )
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{
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if ( sgIsBigEndian() ) {
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sgEndianSwap( (uint64*)&var);
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}
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if ( gzwrite ( fd, (void *)(&var), sizeof(int64) )
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!= sizeof(int64) )
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{
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write_error = true ;
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}
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}
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void sgReadUShort ( gzFile fd, unsigned short *var )
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{
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if ( gzread ( fd, var, sizeof(unsigned short) ) != sizeof(unsigned short) ){
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read_error = true ;
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}
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if ( sgIsBigEndian() ) {
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sgEndianSwap( (unsigned short int*)var);
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}
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}
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void sgWriteUShort ( gzFile fd, const unsigned short var )
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{
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if ( sgIsBigEndian() ) {
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sgEndianSwap( (unsigned short*)&var);
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}
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if ( gzwrite ( fd, (void *)(&var), sizeof(unsigned short) )
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!= sizeof(unsigned short) )
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{
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write_error = true ;
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}
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}
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void sgReadShort ( gzFile fd, short *var )
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{
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if ( gzread ( fd, var, sizeof(short) ) != sizeof(short) ) {
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read_error = true ;
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}
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if ( sgIsBigEndian() ) {
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sgEndianSwap( (unsigned short int*)var);
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}
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}
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void sgWriteShort ( gzFile fd, const short var )
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{
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if ( sgIsBigEndian() ) {
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sgEndianSwap( (unsigned short*)&var);
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}
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if ( gzwrite ( fd, (void *)(&var), sizeof(short) ) != sizeof(short) ) {
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write_error = true ;
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}
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}
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void sgReadFloat ( gzFile fd, const unsigned int n, float *var )
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{
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if ( gzread ( fd, var, sizeof(float) * n ) != (int)(sizeof(float) * n) ) {
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read_error = true ;
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}
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if ( sgIsBigEndian() ) {
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for ( unsigned int i = 0; i < n; ++i ) {
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sgEndianSwap( (unsigned int*)var++);
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}
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}
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}
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void sgWriteFloat ( gzFile fd, const unsigned int n, const float *var )
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{
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if ( sgIsBigEndian() ) {
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float *swab = new float[n];
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float *ptr = swab;
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memcpy( swab, var, sizeof(float) * n );
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for ( unsigned int i = 0; i < n; ++i ) {
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sgEndianSwap( (unsigned int*)ptr++);
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}
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var = swab;
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}
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if ( gzwrite ( fd, (void *)var, sizeof(float) * n )
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!= (int)(sizeof(float) * n) )
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{
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write_error = true ;
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}
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}
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void sgReadDouble ( gzFile fd, const unsigned int n, double *var )
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{
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if ( gzread ( fd, var, sizeof(double) * n ) != (int)(sizeof(double) * n) ) {
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read_error = true ;
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}
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if ( sgIsBigEndian() ) {
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for ( unsigned int i = 0; i < n; ++i ) {
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sgEndianSwap( (uint64*)var++);
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}
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}
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}
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void sgWriteDouble ( gzFile fd, const unsigned int n, const double *var )
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{
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if ( sgIsBigEndian() ) {
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double *swab = new double[n];
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double *ptr = swab;
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memcpy( swab, var, sizeof(double) * n );
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for ( unsigned int i = 0; i < n; ++i ) {
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sgEndianSwap( (uint64*)ptr++);
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}
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var = swab;
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}
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if ( gzwrite ( fd, (void *)var, sizeof(double) * n )
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!= (int)(sizeof(double) * n) )
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{
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write_error = true ;
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}
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}
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void sgReadBytes ( gzFile fd, const unsigned int n, void *var )
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{
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if ( n == 0) return;
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if ( gzread ( fd, var, n ) != (int)n ) {
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read_error = true ;
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}
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}
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void sgWriteBytes ( gzFile fd, const unsigned int n, const void *var )
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{
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if ( n == 0) return;
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if ( gzwrite ( fd, (void *)var, n ) != (int)n ) {
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write_error = true ;
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}
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}
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void sgReadUShort ( gzFile fd, const unsigned int n, unsigned short *var )
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{
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if ( gzread ( fd, var, sizeof(unsigned short) * n )
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!= (int)(sizeof(unsigned short) * n) )
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{
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read_error = true ;
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}
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if ( sgIsBigEndian() ) {
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for ( unsigned int i = 0; i < n; ++i ) {
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sgEndianSwap( (unsigned short int*)var++);
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}
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}
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}
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void sgWriteUShort ( gzFile fd, const unsigned int n, const unsigned short *var )
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{
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if ( sgIsBigEndian() ) {
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unsigned short *swab = new unsigned short[n];
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unsigned short *ptr = swab;
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memcpy( swab, var, sizeof(unsigned short) * n );
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for ( unsigned int i = 0; i < n; ++i ) {
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sgEndianSwap( (unsigned short*)ptr++);
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}
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var = swab;
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}
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if ( gzwrite ( fd, (void *)var, sizeof(unsigned short) * n )
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!= (int)(sizeof(unsigned short) * n) )
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{
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write_error = true ;
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}
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}
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void sgReadShort ( gzFile fd, const unsigned int n, short *var )
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{
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if ( gzread ( fd, var, sizeof(short) * n )
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!= (int)(sizeof(short) * n) )
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{
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read_error = true ;
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}
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if ( sgIsBigEndian() ) {
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for ( unsigned int i = 0; i < n; ++i ) {
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sgEndianSwap( (unsigned short int*)var++);
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}
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}
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}
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void sgWriteShort ( gzFile fd, const unsigned int n, const short *var )
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{
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if ( sgIsBigEndian() ) {
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short *swab = new short[n];
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short *ptr = swab;
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memcpy( swab, var, sizeof(short) * n );
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for ( unsigned int i = 0; i < n; ++i ) {
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sgEndianSwap( (unsigned short*)ptr++);
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}
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var = swab;
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}
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if ( gzwrite ( fd, (void *)var, sizeof(short) * n )
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!= (int)(sizeof(short) * n) )
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{
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write_error = true ;
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}
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}
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void sgReadUInt ( gzFile fd, const unsigned int n, unsigned int *var )
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{
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if ( gzread ( fd, var, sizeof(unsigned int) * n )
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!= (int)(sizeof(unsigned int) * n) )
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{
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read_error = true ;
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}
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if ( sgIsBigEndian() ) {
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for ( unsigned int i = 0; i < n; ++i ) {
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sgEndianSwap( (unsigned int*)var++);
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}
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}
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}
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void sgWriteUInt ( gzFile fd, const unsigned int n, const unsigned int *var )
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{
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if ( sgIsBigEndian() ) {
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unsigned int *swab = new unsigned int[n];
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unsigned int *ptr = swab;
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memcpy( swab, var, sizeof(unsigned int) * n );
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for ( unsigned int i = 0; i < n; ++i ) {
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sgEndianSwap( (unsigned int*)ptr++);
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}
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var = swab;
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}
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if ( gzwrite ( fd, (void *)var, sizeof(unsigned int) * n )
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!= (int)(sizeof(unsigned int) * n) )
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{
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write_error = true ;
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}
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}
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void sgReadInt ( gzFile fd, const unsigned int n, int *var )
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{
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if ( gzread ( fd, var, sizeof(int) * n )
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!= (int)(sizeof(int) * n) )
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{
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read_error = true ;
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}
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if ( sgIsBigEndian() ) {
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for ( unsigned int i = 0; i < n; ++i ) {
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sgEndianSwap( (unsigned int*)var++);
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}
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}
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}
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void sgWriteInt ( gzFile fd, const unsigned int n, const int *var )
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{
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if ( sgIsBigEndian() ) {
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int *swab = new int[n];
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int *ptr = swab;
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memcpy( swab, var, sizeof(int) * n );
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for ( unsigned int i = 0; i < n; ++i ) {
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sgEndianSwap( (unsigned int*)ptr++);
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}
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var = swab;
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}
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if ( gzwrite ( fd, (void *)var, sizeof(int) * n )
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!= (int)(sizeof(int) * n) )
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{
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write_error = true ;
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}
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}
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#define MAX_ENTITY_NAME_LENGTH 1024
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void sgReadString ( gzFile fd, char **var )
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{
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int i ;
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char s [ MAX_ENTITY_NAME_LENGTH ] ;
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for ( i = 0 ; i < MAX_ENTITY_NAME_LENGTH ; i++ ) {
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int c = gzgetc ( fd ) ;
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s [ i ] = c ;
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if ( c == '\0' )
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break ;
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}
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if ( i >= MAX_ENTITY_NAME_LENGTH-1 )
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s [ MAX_ENTITY_NAME_LENGTH-1 ] = '\0' ;
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if ( s[0] == '\0' )
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*var = NULL ;
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else {
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*var = new char [ strlen(s)+1 ] ;
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strcpy ( *var, s ) ;
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}
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}
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void sgWriteString ( gzFile fd, const char *var )
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{
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if ( var != NULL ) {
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if ( gzwrite ( fd, (void *)var, strlen(var) + 1 ) ==
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(int)(strlen(var) + 1) )
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return ;
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} else {
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gzputc( fd, 0 );
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}
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}
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