LittleEndianBuffer.cpp

   1 /*
   2  * This file is part of ShapeFusion (Copyright 2000 Tito Dal Canton)
   3  *
   4  * ShapeFusion is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * ShapeFusion is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with ShapeFusion; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17 */
  18 #include <iostream>
  19 #include "LittleEndianBuffer.h"
  20
  21 LittleEndianBuffer::LittleEndianBuffer(unsigned int _size):
  22                 GenericEndianBuffer(_size)
  23 {
  24
  25 }
  26
  27 LittleEndianBuffer::LittleEndianBuffer(unsigned char *_data, unsigned int _size):
  28                 GenericEndianBuffer(_data, _size)
  29 {
  30
  31 }
  32
  33 LittleEndianBuffer::~LittleEndianBuffer(void)
  34 {
  35
  36 }
  37
  38 short LittleEndianBuffer::ReadShort(void)
  39 {
  40         if ((unsigned int)(mPosition - mData + 1) < mSize) {
  41                 unsigned char   lo = *mPosition++,
  42                                                 hi = *mPosition++;
  43
  44                 return (short)((hi << 8) | lo);
  45         } else {
  46                 std::cerr << "LittleEndianBuffer: attempted read beyond buffer limits\n";
  47                 return 0;
  48         }
  49 }
  50
  51 unsigned short LittleEndianBuffer::ReadUShort(void)
  52 {
  53         if ((unsigned int)(mPosition - mData + 1) < mSize) {
  54                 unsigned char   lo = *mPosition++,
  55                                                 hi = *mPosition++;
  56
  57                 return (unsigned short)((hi << 8) | lo);
  58         } else {
  59                 std::cerr << "LittleEndianBuffer: attempted read beyond buffer limits\n";
  60                 return 0;
  61         }
  62 }
  63
  64 long LittleEndianBuffer::ReadLong(void)
  65 {
  66         if ((unsigned int)(mPosition - mData + 3) < mSize) {
  67                 unsigned char   a = *mPosition++,
  68                                                 b = *mPosition++,
  69                                                 c = *mPosition++,
  70                                                 d = *mPosition++;
  71
  72                 return (long)((d << 24) | (c << 16) | (b << 8) | a);
  73         } else {
  74                 std::cerr << "LittleEndianBuffer: attempted read beyond buffer limits\n";
  75                 return 0;
  76         }
  77 }
  78
  79 unsigned long LittleEndianBuffer::ReadULong(void)
  80 {
  81         if ((unsigned int)(mPosition - mData + 3) < mSize) {
  82                 unsigned char   a = *mPosition++,
  83                                                 b = *mPosition++,
  84                                                 c = *mPosition++,
  85                                                 d = *mPosition++;
  86
  87                 return (unsigned long)((d << 24) | (c << 16) | (b << 8) | a);
  88         } else {
  89                 std::cerr << "LittleEndianBuffer: attempted read beyond buffer limits\n";
  90                 return 0;
  91         }
  92 }
  93
  94 void LittleEndianBuffer::WriteShort(short v)
  95 {
  96         if ((unsigned int)(mPosition - mData + 1) < mSize) {
  97                 *mPosition++ = v & 0xff;
  98                 *mPosition++ = (v >> 8) & 0xff;
  99         } else {
 100                 std::cerr << "LittleEndianBuffer: attempted write beyond buffer limits\n";
 101         }
 102 }
 103
 104 void LittleEndianBuffer::WriteUShort(unsigned short v)
 105 {
 106         if ((unsigned int)(mPosition - mData + 1) < mSize) {
 107                 *mPosition++ = v & 0xff;
 108                 *mPosition++ = (v >> 8) & 0xff;
 109         } else {
 110                 std::cerr << "LittleEndianBuffer: attempted write beyond buffer limits\n";
 111         }
 112 }
 113
 114 void LittleEndianBuffer::WriteLong(long v)
 115 {
 116         if ((unsigned int)(mPosition - mData + 3) < mSize) {
 117                 *mPosition++ = v & 0xff;
 118                 *mPosition++ = (v >> 8) & 0xff;
 119                 *mPosition++ = (v >> 16) & 0xff;
 120                 *mPosition++ = (v >> 24) & 0xff;
 121         } else {
 122                 std::cerr << "LittleEndianBuffer: attempted write beyond buffer limits\n";
 123         }
 124 }
 125
 126 void LittleEndianBuffer::WriteULong(unsigned long v)
 127 {
 128         if ((unsigned int)(mPosition - mData + 3) < mSize) {
 129                 *mPosition++ = v & 0xff;
 130                 *mPosition++ = (v >> 8) & 0xff;
 131                 *mPosition++ = (v >> 16) & 0xff;
 132                 *mPosition++ = (v >> 24) & 0xff;
 133         } else {
 134                 std::cerr << "LittleEndianBuffer: attempted write beyond buffer limits\n";
 135         }
 136 }
 137