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// Author: Eray Ozkural (exa) <erayo@cs.bilkent.edu.tr>, (c) 2002
//
// Copyright: GNU LGPL: http://www.gnu.org/licenses/lgpl.html
#include "kbuffer.h"
#include <algorithm>
#include <iostream>
#include <iomanip>
KBuffer::KBuffer()
{
bufPos = buf.end(); // will become 0 in the beginning
}
KBuffer::~KBuffer(){
}
/** open a memory buffer */
bool KBuffer::open(int ) {
// ignore mode
buf.erase(buf.begin(), buf.end()); // erase buffer
buf.reserve(8); // prevent iterators from ever being 0 and start with a reasonable mem
bufPos = buf.end(); // reset position
return true;
}
/** Close buffer */
void KBuffer::close(){
}
/** No descriptions */
void KBuffer::flush(){
}
/** query buffer size */
Q_ULONG KBuffer::size() const {
return buf.size();
}
/** read a block of memory from buffer, advances read/write position */
Q_LONG KBuffer::readBlock(char* data, long unsigned int maxLen) {
int len;
if ((long unsigned)(buf.end()-bufPos) > maxLen)
len = maxLen;
else
len = buf.end()-bufPos;
std::vector<char>::iterator bufPosNew = bufPos + len;
for (std::vector<char>::iterator it=bufPos; it < bufPosNew; it++, data++)
*data = *it;
bufPos = bufPosNew;
return len;
}
/** write a block of memory into buffer */
Q_LONG KBuffer::writeBlock(const char *data, long unsigned int len){
int pos = bufPos-buf.begin();
copy(data, data+len, inserter(buf,bufPos));
bufPos = buf.begin() + pos + len;
return len;
}
/** read a byte */
int KBuffer::getch() {
if (bufPos!=buf.end())
return *(bufPos++);
else
return -1;
}
/** write a byte */
int KBuffer::putch(int c) {
int pos = bufPos-buf.begin();
buf.insert(bufPos, c);
bufPos = buf.begin() + pos + 1;
return c;
}
/** undo last getch()
*/
int KBuffer::ungetch(int c) {
if (bufPos!=buf.begin()) {
bufPos--;
return c;
}
else
return -1;
}
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