275 lines
7.8 KiB
C
275 lines
7.8 KiB
C
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/*
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* Microsoft Confidential
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* Copyright (C) Microsoft Corporation 1996
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* All Rights Reserved.
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*
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* LCI.H - Diamond Memory Compression Interface (LCI)
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*
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* History:
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* 03-Jul-1996 jforbes Created from QCI.H
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*
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* Functions:
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* LCICreateCompression - Create and reset an LCI compression context
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* LCICompress - Compress a block of data
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* LCIResetCompression - Reset compression context
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* LCIDestroyCompression - Destroy LCI compression context
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* LCISetTranslationSize - Set file translation size
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*
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* Types:
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* LCI_CONTEXT_HANDLE - Handle to an LCI compression context
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* PFNALLOC - Memory allocation function for LCI
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* PFNFREE - Free memory function for LCI
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*/
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/* --- types -------------------------------------------------------------- */
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#include <basetsd.h>
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extern "C"
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{
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#ifndef DIAMONDAPI
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#define DIAMONDAPI __cdecl
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#endif
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#ifndef _BYTE_DEFINED
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#define _BYTE_DEFINED
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typedef unsigned char BYTE;
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#endif
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#ifndef _UINT_DEFINED
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#define _UINT_DEFINED
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typedef unsigned int UINT;
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#endif
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#ifndef _ULONG_DEFINED
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#define _ULONG_DEFINED
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typedef unsigned long ULONG;
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#endif
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#ifndef FAR
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#ifdef BIT16
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#define FAR far
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#else
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#define FAR
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#endif
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#endif
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#ifndef HUGE
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#ifdef BIT16
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#define HUGE huge
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#else
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#define HUGE
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#endif
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#endif
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#ifndef _MI_MEMORY_DEFINED
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#define _MI_MEMORY_DEFINED
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typedef void HUGE * MI_MEMORY;
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#endif
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#ifndef _MHANDLE_DEFINED
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#define _MHANDLE_DEFINED
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#ifdef IA64
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typedef ULONG_PTR MHANDLE;
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#else
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typedef unsigned long MHANDLE;
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#endif
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#endif
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/* --- LCI-defined types -------------------------------------------------- */
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/* LCI_CONTEXT_HANDLE - Handle to an LCI compression context */
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typedef MHANDLE LCI_CONTEXT_HANDLE; /* hmc */
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/*** PFNALLOC - Memory allocation function for LCI
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*
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* Entry:
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* cb - Size in bytes of memory block to allocate
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*
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* Exit-Success:
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* Returns !NULL pointer to memory block
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*
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* Exit-Failure:
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* Returns NULL; insufficient memory
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*/
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#ifndef _PFNALLOC_DEFINED
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#define _PFNALLOC_DEFINED
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typedef MI_MEMORY (FAR DIAMONDAPI *PFNALLOC)(ULONG cb); /* pfnma */
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#endif
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/*** PFNFREE - Free memory function for LCI
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*
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* Entry:
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* pv - Memory block allocated by matching PFNALLOC function
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*
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* Exit:
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* Memory block freed.
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*/
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#ifndef _PFNFREE_DEFINED
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#define _PFNFREE_DEFINED
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typedef void (FAR DIAMONDAPI *PFNFREE)(MI_MEMORY pv); /* pfnmf */
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#endif
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/* --- prototypes --------------------------------------------------------- */
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/*** LCICreateCompression - Create LCI compression context
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*
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* Entry:
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* pcbDataBlockMax *largest uncompressed data block size desired,
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* gets largest uncompressed data block allowed
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* pvConfiguration passes implementation-specific info to compressor.
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* pfnma memory allocation function pointer
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* pfnmf memory free function pointer
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* pcbDstBufferMin gets required compressed data buffer size
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* pmchHandle gets newly-created context's handle
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*
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* Exit-Success:
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* Returns MCI_ERROR_NO_ERROR;
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* *pcbDataBlockMax, *pcbDstBufferMin, *pmchHandle filled in.
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*
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* Exit-Failure:
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* MCI_ERROR_NOT_ENOUGH_MEMORY, could not allocate enough memory.
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* MCI_ERROR_BAD_PARAMETERS, something wrong with parameters.
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*/
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int FAR DIAMONDAPI LCICreateCompression(
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UINT FAR * pcbDataBlockMax, /* max uncompressed data block size */
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void FAR * pvConfiguration, /* See LZXCONFIGURATION */
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PFNALLOC pfnma, /* Memory allocation function ptr */
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PFNFREE pfnmf, /* Memory free function ptr */
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UINT FAR * pcbDstBufferMin, /* gets required output buffer size */
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LCI_CONTEXT_HANDLE FAR *pmchHandle, /* gets newly-created handle */
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int FAR (DIAMONDAPI *pfnlzx_output_callback)(
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void * pfol,
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unsigned char * compressed_data,
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long compressed_size,
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long uncompressed_size
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),
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void FAR * fci_pv // not the same as the FCI client's pv
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);
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/*** LCICompress - Compress a block of data
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*
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* Entry:
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* hmc handle to compression context
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* pbSrc source buffer (uncompressed data)
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* cbSrc size of data to be compressed
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* pbDst destination buffer (for compressed data)
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* cbDst size of destination buffer
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* pcbResult receives compressed size of data
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*
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* Exit-Success:
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* Returns MCI_ERROR_NO_ERROR;
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* *pcbResult has size of compressed data in pbDst.
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* Compression context possibly updated.
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*
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* Exit-Failure:
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* MCI_ERROR_BAD_PARAMETERS, something wrong with parameters.
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*/
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int FAR DIAMONDAPI LCICompress(
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LCI_CONTEXT_HANDLE hmc, /* compression context */
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void FAR * pbSrc, /* source buffer */
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UINT cbSrc, /* source buffer size */
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void FAR * pbDst, /* target buffer */
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UINT cbDst, /* target buffer size */
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ULONG FAR * pcbResult); /* gets target data size */
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/*** LCIResetCompression - Reset compression history (if any)
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*
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* De-compression can only be started on a block which was compressed
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* immediately following a LCICreateCompression() or LCIResetCompression()
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* call. This function forces such a new "compression boundary" to be
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* created (only by causing the compressor to ignore history, can the data
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* output be decompressed without history.)
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*
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* Entry:
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* hmc - handle to compression context
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*
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* Exit-Success:
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* Returns MCI_ERROR_NO_ERROR;
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* Compression context reset.
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*
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* Exit-Failure:
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* Returns MCI_ERROR_BAD_PARAMETERS, invalid context handle.
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*/
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int FAR DIAMONDAPI LCIResetCompression(LCI_CONTEXT_HANDLE hmc);
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/*** LCIDestroyCompression - Destroy LCI compression context
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*
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* Entry:
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* hmc - handle to compression context
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*
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* Exit-Success:
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* Returns MCI_ERROR_NO_ERROR;
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* Compression context destroyed.
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*
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* Exit-Failure:
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* Returns MCI_ERROR_BAD_PARAMETERS, invalid context handle.
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*/
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int FAR DIAMONDAPI LCIDestroyCompression(LCI_CONTEXT_HANDLE hmc);
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/*
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* Forces encoder to flush remaining output
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*/
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int FAR DIAMONDAPI LCIFlushCompressorOutput(LCI_CONTEXT_HANDLE hmc);
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/*
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* Set the file translation size
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* (this must be done immediately after a reset, or an LCICreateCompression)
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*/
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int FAR DIAMONDAPI LCISetTranslationSize(LCI_CONTEXT_HANDLE hmc, unsigned long size);
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/*
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* Returns a pointer to the input data present in LZX's buffers.
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*
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* input_position is the offset of the data from the beginning of the file
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* bytes_available is the number of bytes available from that offset
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*/
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unsigned char * FAR DIAMONDAPI LCIGetInputData(
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LCI_CONTEXT_HANDLE hmc,
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unsigned long *input_position,
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unsigned long *bytes_available
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);
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/* --- constants ---------------------------------------------------------- */
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/* return codes */
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#define MCI_ERROR_NO_ERROR 0
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#define MCI_ERROR_NOT_ENOUGH_MEMORY 1
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#define MCI_ERROR_BAD_PARAMETERS 2
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#define MCI_ERROR_BUFFER_OVERFLOW 3
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#define MCI_ERROR_FAILED 4
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#define MCI_ERROR_CONFIGURATION 5
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/* --- LZX configuration details ------------------------------------- */
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/*** LZX pvConfiguration structure
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*
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* The SecondPartitionSize must be >= 32K. It is the amount of
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* data which LZX compresses before copymem'ing the window and
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* tree contents around.
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*/
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#pragma pack (2)
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typedef struct {
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int WindowSize; // buffer size
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int SecondPartitionSize;
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} LZXCONFIGURATION; /* lcfg */
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#pragma pack ()
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typedef LZXCONFIGURATION *PLZXCONFIGURATION; /* plcfg */
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/* ----------------------------------------------------------------------- */
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}
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