BufferedOutputStream.cpp.svn-base
上传用户:market2
上传日期:2018-11-18
资源大小:18786k
文件大小:2k
源码类别:
外挂编程
开发平台:
Windows_Unix
- /*
- * OpenKore C++ Standard Library
- * Copyright (C) 2006 VCL
- *
- * 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., 51 Franklin Street, Fifth Floor, Boston,
- * MA 02110-1301 USA
- */
- #include <assert.h>
- #include <stdlib.h>
- #include <string.h>
- #include "BufferedOutputStream.h"
- #include "IOException.h"
- namespace OSL {
- BufferedOutputStream::BufferedOutputStream(OutputStream *stream, unsigned int size) {
- this->stream = stream;
- stream->ref();
- maxsize = size;
- buffer = new char[size];
- count = 0;
- }
- BufferedOutputStream::~BufferedOutputStream() {
- close();
- }
- void
- BufferedOutputStream::close() {
- if (stream != NULL) {
- flush();
- stream->close();
- stream->unref();
- delete buffer;
- stream = NULL;
- buffer = NULL;
- }
- }
- void
- BufferedOutputStream::flush() throw(IOException) {
- if (stream == NULL) {
- throw IOException("The stream is closed.");
- } else if (count > 0) {
- // We make a copy of count just in case write() or
- // flush() throws an exception.
- unsigned int c = count;
- count = 0;
- stream->write(buffer, c);
- stream->flush();
- }
- }
- unsigned int
- BufferedOutputStream::write(const char *data, unsigned int size) throw(IOException) {
- assert(data != NULL);
- assert(size > 0);
- if (stream == NULL) {
- throw IOException("The stream is closed.");
- }
- unsigned int written = 0;
- size_t rest = size;
- while (rest > 0) {
- size_t n = rest;
- if (n > maxsize - count) {
- n = maxsize - count;
- }
- memcpy (buffer + count, data + written, n);
- count += n;
- rest -= n;
- written += n;
- if (count == maxsize) {
- flush();
- }
- }
- return written;
- }
- }