forked from 0ad/0ad
janwas
cccd6849a7
lib_errors.cpp: replace with status.cpp, adapt to needs at work wutil: fix runtime warning reported via feedback box config: merge CONFIG_PARANOIA and !CONFIG_FINAL into CONFIG_ENABLE_CHECKS add openmp, pointer_typedefs.h This was SVN commit r9410.
95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
/* Copyright (c) 2010 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.
|
|
*/
|
|
|
|
/*
|
|
* this layer allows for other compression methods/libraries
|
|
* besides ZLib. it also simplifies the interface for user code and
|
|
* does error checking, etc.
|
|
*/
|
|
|
|
#ifndef INCLUDED_CODEC
|
|
#define INCLUDED_CODEC
|
|
|
|
#define CODEC_COMPUTE_CHECKSUM 1
|
|
|
|
struct ICodec
|
|
{
|
|
public:
|
|
/**
|
|
* note: the implementation should not check whether any data remains -
|
|
* codecs are sometimes destroyed without completing a transfer.
|
|
**/
|
|
virtual ~ICodec();
|
|
|
|
/**
|
|
* @return an upper bound on the output size for the given amount of input.
|
|
* this is used when allocating a single buffer for the whole operation.
|
|
**/
|
|
virtual size_t MaxOutputSize(size_t inSize) const = 0;
|
|
|
|
/**
|
|
* clear all previous state and prepare for reuse.
|
|
*
|
|
* this is as if the object were destroyed and re-created, but more
|
|
* efficient since it avoids reallocating a considerable amount of
|
|
* memory (about 200KB for LZ).
|
|
**/
|
|
virtual Status Reset() = 0;
|
|
|
|
/**
|
|
* process (i.e. compress or decompress) data.
|
|
*
|
|
* @param in
|
|
* @param inSize
|
|
* @param out
|
|
* @param outSize Bytes remaining in the output buffer; shall not be zero.
|
|
* @param inConsumed,outProduced How many bytes in the input and
|
|
* output buffers were used. either or both of these can be zero if
|
|
* the input size is small or there's not enough output space.
|
|
**/
|
|
virtual Status Process(const u8* in, size_t inSize, u8* out, size_t outSize, size_t& inConsumed, size_t& outProduced) = 0;
|
|
|
|
/**
|
|
* Flush buffers and make sure all output has been produced.
|
|
*
|
|
* @param checksum Checksum over all input data.
|
|
* @param outProduced
|
|
* @return error status for the entire operation.
|
|
**/
|
|
virtual Status Finish(u32& checksum, size_t& outProduced) = 0;
|
|
|
|
/**
|
|
* update a checksum to reflect the contents of a buffer.
|
|
*
|
|
* @param checksum the initial value (must be 0 on first call)
|
|
* @param in
|
|
* @param inSize
|
|
* @return the new checksum. note: after all data has been seen, this is
|
|
* identical to the what Finish would return.
|
|
**/
|
|
virtual u32 UpdateChecksum(u32 checksum, const u8* in, size_t inSize) const = 0;
|
|
};
|
|
|
|
typedef shared_ptr<ICodec> PICodec;
|
|
|
|
#endif // #ifndef INCLUDED_CODEC
|