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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "common/std/algorithm.h"
#include "ags/shared/util/data_stream.h"
namespace AGS3 {
namespace AGS {
namespace Shared {
DataStream::DataStream(DataEndianess stream_endianess)
: _streamEndianess(stream_endianess) {
}
DataStream::~DataStream() {}
int16_t DataStream::ReadInt16() {
int16_t val = 0;
Read(&val, sizeof(int16_t));
ConvertInt16(val);
return val;
}
int32_t DataStream::ReadInt32() {
int32_t val = 0;
Read(&val, sizeof(int32_t));
ConvertInt32(val);
return val;
}
int64_t DataStream::ReadInt64() {
int64_t val = 0;
Read(&val, sizeof(int64_t));
ConvertInt64(val);
return val;
}
size_t DataStream::WriteInt16(int16_t val) {
ConvertInt16(val);
return Write(&val, sizeof(int16_t));
}
size_t DataStream::WriteInt32(int32_t val) {
ConvertInt32(val);
return Write(&val, sizeof(int32_t));
}
size_t DataStream::WriteInt64(int64_t val) {
ConvertInt64(val);
return Write(&val, sizeof(int64_t));
}
size_t DataStream::ReadAndConvertArrayOfInt16(int16_t *buffer, size_t count) {
count = ReadArray(buffer, sizeof(int16_t), count);
for (size_t i = 0; i < count; ++i, ++buffer) {
*buffer = BBOp::SwapBytesInt16(*buffer);
}
return count;
}
size_t DataStream::ReadAndConvertArrayOfInt32(int32_t *buffer, size_t count) {
count = ReadArray(buffer, sizeof(int32_t), count);
for (size_t i = 0; i < count; ++i, ++buffer) {
*buffer = BBOp::SwapBytesInt32(*buffer);
}
return count;
}
size_t DataStream::ReadAndConvertArrayOfInt64(int64_t *buffer, size_t count) {
count = ReadArray(buffer, sizeof(int64_t), count);
for (size_t i = 0; i < count; ++i, ++buffer) {
*buffer = BBOp::SwapBytesInt64(*buffer);
}
return count;
}
size_t DataStream::WriteAndConvertArrayOfInt16(const int16_t *buffer, size_t count) {
size_t elem;
for (elem = 0; elem < count; ++elem, ++buffer) {
int16_t val = *buffer;
ConvertInt16(val);
if (Write(&val, sizeof(int16_t)) < sizeof(int16_t)) {
break;
}
}
return elem;
}
size_t DataStream::WriteAndConvertArrayOfInt32(const int32_t *buffer, size_t count) {
size_t elem;
for (elem = 0; elem < count; ++elem, ++buffer) {
int32_t val = *buffer;
ConvertInt32(val);
if (Write(&val, sizeof(int32_t)) < sizeof(int32_t)) {
break;
}
}
return elem;
}
size_t DataStream::WriteAndConvertArrayOfInt64(const int64_t *buffer, size_t count) {
size_t elem;
for (elem = 0; elem < count; ++elem, ++buffer) {
int64_t val = *buffer;
ConvertInt64(val);
if (Write(&val, sizeof(int64_t)) < sizeof(int64_t)) {
break;
}
}
return elem;
}
DataStreamSection::DataStreamSection(Stream *base, soff_t start, soff_t end)
: _base(base) {
_start = std::max((soff_t)0, std::min(start, end));
_end = std::min(std::max((soff_t)0, end), base->GetLength());
soff_t pos = base->Seek(_start, kSeekBegin);
if (pos >= 0)
_position = pos;
else
_position = base->GetPosition();
}
size_t DataStreamSection::Read(void *buffer, size_t len) {
if (_position >= _end)
return 0;
len = std::min(len, static_cast<size_t>(_end - _position));
_position += _base->Read(buffer, len);
return len;
}
int32_t DataStreamSection::ReadByte() {
if (_position >= _end)
return -1;
int32_t b = _base->ReadByte();
if (b >= 0)
_position++;
return b;
}
size_t DataStreamSection::Write(const void *buffer, size_t len) {
len = _base->Write(buffer, len);
_position += len;
_end = std::max(_end, _position); // we might be overwriting after seeking back
return len;
}
int32_t DataStreamSection::WriteByte(uint8_t b) {
int32_t rb = _base->WriteByte(b);
if (rb == b) {
_position++;
_end = std::max(_end, _position); // we might be overwriting after seeking back
}
return rb;
}
soff_t DataStreamSection::Seek(soff_t offset, StreamSeek origin) {
soff_t want_pos = -1;
switch (origin) {
case StreamSeek::kSeekCurrent:
want_pos = _position + offset;
break;
case StreamSeek::kSeekBegin:
want_pos = _start + offset;
break;
case StreamSeek::kSeekEnd:
want_pos = _end + offset;
break;
default:
return -1;
}
want_pos = std::min(std::max(want_pos, _start), _end);
soff_t new_pos = _base->Seek(want_pos, kSeekBegin);
if (new_pos >= 0) // the position remains in case of seek error
_position = want_pos;
return _position - _start; // convert to a stream section pos
}
void DataStreamSection::Close() {
// We do not close nor delete the base stream, but release it from use
_base = nullptr;
}
} // namespace Shared
} // namespace AGS
} // namespace AGS3
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