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