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/* Copyright (C) 2025 Wildfire Games.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* output buffer and 'stream' layered on top of a compression codec
*/
#ifndef INCLUDED_STREAM
#define INCLUDED_STREAM
#include "lib/code_annotation.h"
#include "lib/file/archive/codec.h"
#include "lib/status.h"
#include "lib/types.h"
#include <cstddef>
#include <memory>
// note: this is similar in function to std::vector, but we don't need
// iterators etc. and would prefer to avoid initializing each byte.
class OutputBufferManager
{
public:
OutputBufferManager();
void Reset();
void SetBuffer(u8* buffer, size_t size);
/**
* allocate a new output buffer.
*
* @param size [bytes] to allocate.
*
* notes:
* - if a buffer had previously been allocated and is large enough,
* it is reused (this reduces the number of allocations).
* - this class manages the lifetime of the buffer.
**/
void AllocateBuffer(size_t size);
u8* Buffer() const
{
return m_buffer;
}
size_t Size() const
{
return m_size;
}
private:
bool IsAllowableBuffer(u8* buffer, size_t size);
u8* m_buffer;
size_t m_size;
std::shared_ptr<u8> m_mem;
// size of m_mem. allows reusing previously allocated buffers
// (user-specified buffers can't be reused because we have no control
// over their lifetime)
size_t m_capacity;
};
class Stream
{
public:
Stream(const PICodec& codec);
void SetOutputBuffer(u8* out, size_t outSize);
void AllocateOutputBuffer(size_t outSizeMax);
/**
* 'feed' the codec with a data block.
**/
Status Feed(const u8* in, size_t inSize);
Status Finish();
size_t OutSize() const
{
return m_outProduced;
}
u32 Checksum() const
{
return m_checksum;
}
private:
PICodec m_codec;
OutputBufferManager m_outputBufferManager;
size_t m_inConsumed;
size_t m_outProduced;
u32 m_checksum;
};
// avoids the need for std::bind (not supported on all compilers) and boost::bind (can't be
// used at work)
struct StreamFeeder
{
NONCOPYABLE(StreamFeeder);
public:
StreamFeeder(Stream& stream)
: stream(stream)
{
}
Status operator()(const u8* data, size_t size) const
{
return stream.Feed(data, size);
}
private:
Stream& stream;
};
#endif // #ifndef INCLUDED_STREAM
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