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#include "startrek/filestream.h"
namespace StarTrek {
FileStream::FileStream(Common::SeekableReadStream *stream, bool bigEndian) {
_bigEndian = bigEndian;
_pos = 0;
_size = stream->size();
_data = new byte[_size];
stream->read(_data, _size);
delete stream;
}
FileStream::~FileStream() {
delete[] _data;
}
// ReadStream functions
uint32 FileStream::read(void *dataPtr, uint32 dataSize) {
if (_pos + dataSize > (uint32)size())
dataSize = size() - _pos;
memcpy(dataPtr, _data + _pos, dataSize);
_pos += dataSize;
return dataSize;
}
byte FileStream::readByte() {
assert(_pos + 1 <= size());
return _data[_pos++];
}
uint16 FileStream::readUint16() {
assert(_pos + 2 <= size());
uint16 w;
if (_bigEndian)
w = _data[_pos + 1] | (_data[_pos] << 8);
else
w = _data[_pos] | (_data[_pos + 1] << 8);
_pos += 2;
return w;
}
uint32 FileStream::readUint32() {
assert(_pos + 4 <= size());
uint32 w;
if (_bigEndian)
w = _data[_pos + 3] | (_data[_pos + 2] << 8) | (_data[_pos + 1] << 16) | (_data[_pos] << 24);
else
w = _data[_pos] | (_data[_pos + 1] << 8) | (_data[_pos + 2] << 16) | (_data[_pos + 3] << 24);
_pos += 4;
return w;
}
// SeekableReadStream functions
int32 FileStream::pos() const {
return _pos;
}
int32 FileStream::size() const {
return _size;
}
bool FileStream::seek(int32 offset, int whence) {
assert(whence == SEEK_SET);
_pos = offset;
return true;
}
}
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