130 lines
3.1 KiB
C++
130 lines
3.1 KiB
C++
/*
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Copyright (c) 2013 yvt
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This file is part of OpenSpades.
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OpenSpades 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 3 of the License, or
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(at your option) any later version.
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OpenSpades 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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You should have received a copy of the GNU General Public License
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along with OpenSpades. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "MemoryStream.h"
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#include "Exception.h"
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#include "Debug.h"
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#include <string.h>
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namespace spades {
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MemoryStream::MemoryStream(char *buffer,
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size_t len,
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bool allowWrite) {
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SPADES_MARK_FUNCTION();
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memory = (unsigned char *)buffer;
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position = 0;
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length = len;
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canWrite = allowWrite;
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}
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MemoryStream::MemoryStream(const char *buffer,
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size_t len) {
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SPADES_MARK_FUNCTION();
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memory = (unsigned char *)const_cast<char *>(buffer);
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position = 0;
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length = len;
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canWrite = false;
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}
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MemoryStream::~MemoryStream() {
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SPADES_MARK_FUNCTION();
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}
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int MemoryStream::ReadByte() {
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SPADES_MARK_FUNCTION();
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if(position < length)
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return memory[(size_t)(position++)];
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else
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return -1;
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}
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size_t MemoryStream::Read(void *data,
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size_t bytes) {
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SPADES_MARK_FUNCTION();
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if(position >= length){
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return 0;
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}
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uint64_t maxBytes = length - position;
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if((uint64_t)bytes > maxBytes)
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bytes = (size_t)maxBytes;
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memcpy(data, memory + (size_t)position,
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(size_t)bytes);
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position += (uint64_t)bytes;
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return bytes;
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}
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std::string MemoryStream::Read(size_t bytes) {
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SPADES_MARK_FUNCTION();
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if(position >= length){
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return std::string();
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}
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uint64_t maxBytes = length - position;
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if((uint64_t)bytes > maxBytes)
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bytes = (size_t)maxBytes;
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std::string s((char*)(memory + position), bytes);
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position += (uint64_t)bytes;
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return s;
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}
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void MemoryStream::WriteByte(int byte) {
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SPADES_MARK_FUNCTION();
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if(canWrite){
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SPRaise("Write prohibited");
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}
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if(position >= length){
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SPRaise("Attempted to write beyond the specified memory range.");
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}else {
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memory[(size_t)(position++)] = (unsigned char)byte;
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}
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}
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void MemoryStream::Write(const void *data, size_t bytes) {
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SPADES_MARK_FUNCTION();
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if(canWrite){
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SPRaise("Write prohibited");
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}
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if(position + (uint64_t)bytes > length ||
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position + (uint64_t)bytes < position){ // integer overflow check
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SPRaise("Attempted to write beyond the specified memory range.");
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}else {
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memcpy(memory + (size_t)position,
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data,
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bytes);
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}
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}
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uint64_t MemoryStream::GetPosition() {
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return position;
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}
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void MemoryStream::SetPosition(uint64_t pos){
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position = pos;
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}
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uint64_t MemoryStream::GetLength() {
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return length;
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}
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void MemoryStream::SetLength(uint64_t len){
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SPRaise("Changing the length of MemroyStream is prohibited.");
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}
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}
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