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