417 lines
14 KiB
C
417 lines
14 KiB
C
|
/*
|
||
|
|
* Microsoft Confidential
|
||
|
|
* Copyright (C) Microsoft Corporation 1993,1994
|
||
|
|
* All Rights Reserved.
|
||
|
|
*
|
||
|
|
* LDI.H - Diamond Memory Decompression Interface (LDI)
|
||
|
|
*
|
||
|
|
* History:
|
||
|
|
* 03-Jul-1994 jforbes Initial version.
|
||
|
|
*
|
||
|
|
* Functions:
|
||
|
|
* LDICreateDecompression - Create and reset an LDI decompression context
|
||
|
|
* LDIDecompress - Decompress a block of data
|
||
|
|
* LDIResetDecompression - Reset LDI decompression context
|
||
|
|
* LDIDestroyDecompression - Destroy LDI Decompression context
|
||
|
|
*
|
||
|
|
* Types:
|
||
|
|
* LDI_CONTEXT_HANDLE - Handle to an LDI decompression context
|
||
|
|
* PFNALLOC - Memory allocation function for LDI
|
||
|
|
* PFNFREE - Free memory function for LDI
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* --- types -------------------------------------------------------------- */
|
||
|
|
|
||
|
|
#include <basetsd.h>
|
||
|
|
|
||
|
|
#ifndef DIAMONDAPI
|
||
|
|
#define DIAMONDAPI __cdecl
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef _BYTE_DEFINED
|
||
|
|
#define _BYTE_DEFINED
|
||
|
|
typedef unsigned char BYTE;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef _UINT_DEFINED
|
||
|
|
#define _UINT_DEFINED
|
||
|
|
typedef unsigned int UINT;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef _ULONG_DEFINED
|
||
|
|
#define _ULONG_DEFINED
|
||
|
|
typedef unsigned long ULONG;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef NEAR
|
||
|
|
# ifdef BIT16
|
||
|
|
# define NEAR __near
|
||
|
|
# else
|
||
|
|
# define NEAR
|
||
|
|
# endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef FAR
|
||
|
|
#ifdef BIT16
|
||
|
|
#define FAR __far
|
||
|
|
#else
|
||
|
|
#define FAR
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef HUGE
|
||
|
|
#ifdef BIT16
|
||
|
|
#define HUGE __huge
|
||
|
|
#else
|
||
|
|
#define HUGE
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef _MI_MEMORY_DEFINED
|
||
|
|
#define _MI_MEMORY_DEFINED
|
||
|
|
typedef void HUGE * MI_MEMORY;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef _MHANDLE_DEFINED
|
||
|
|
#define _MHANDLE_DEFINED
|
||
|
|
#if defined(_WIN64)
|
||
|
|
typedef unsigned __int64 MHANDLE;
|
||
|
|
#else
|
||
|
|
typedef unsigned long MHANDLE;
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef UNALIGNED
|
||
|
|
#ifndef NEEDS_ALIGNMENT
|
||
|
|
#define UNALIGNED
|
||
|
|
#else
|
||
|
|
#define UNALIGNED __unaligned
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* LDI will try to create a virtual ring buffer on disk if the pfnalloc call
|
||
|
|
* to create the buffer fails. These functions provide LDI the disk access
|
||
|
|
* features needed.
|
||
|
|
*
|
||
|
|
* These are modeled after the C run-time routines _open, _read,
|
||
|
|
* _write, _close, and _lseek. The values for the PFNOPEN oflag
|
||
|
|
* and pmode calls are those defined for _open. LDI expects error
|
||
|
|
* handling to be identical to these C run-time routines.
|
||
|
|
*
|
||
|
|
* As long as you faithfully copy these aspects, you can supply
|
||
|
|
* any functions you like!
|
||
|
|
*
|
||
|
|
* For PFNOPEN, the pszFile parameter will take on a special form for LDI's
|
||
|
|
* temporary file. The special form appears as a file named "*". Such a
|
||
|
|
* name field should be cast into the struct below, which contains the
|
||
|
|
* required file's size as shown in the RINGNAME structure below.
|
||
|
|
*
|
||
|
|
* Example open and close callbacks are provided. It is assumed that the
|
||
|
|
* client will provide more adaptive code for determining the temporary
|
||
|
|
* file's name and drive location, based on environment variables and the
|
||
|
|
* amount of free disk space. This sample code has hard-coded the actual
|
||
|
|
* path and fails if there is not enough free space. This code creates the
|
||
|
|
* file, then attempts to expand it to the requested size by writing a byte
|
||
|
|
* (any byte) at the requested size - 1. (This approach is not suitable for
|
||
|
|
* a file system which can support sparse files.)
|
||
|
|
*
|
||
|
|
* The callback routine may create this file on any path, and with any name,
|
||
|
|
* as appropriate. If the file cannot be created with the requested size,
|
||
|
|
* the PFNOPEN should fail. The file really should be placed on a local
|
||
|
|
* fixed disk. It would not be appropriate for the file to be placed on a
|
||
|
|
* compressed drive or a floppy disk. If the client has access to alternate
|
||
|
|
* memory, such as XMS or EMS, these operations could be emuluated.
|
||
|
|
*
|
||
|
|
* static int tempHandle = -1;
|
||
|
|
*
|
||
|
|
* int FAR DIAMONDAPI MyOpen(char FAR *pszFile,int oflag,int pmode)
|
||
|
|
* {
|
||
|
|
* if (*pszFile == '*')
|
||
|
|
* {
|
||
|
|
* PRINGNAME pringDescriptor;
|
||
|
|
*
|
||
|
|
* pringDescriptor = (PRINGNAME) pszFile;
|
||
|
|
*
|
||
|
|
* tempHandle = _open("C:\\ldi_temp.$$$",oflag,pmode);
|
||
|
|
*
|
||
|
|
* if (tempHandle != -1)
|
||
|
|
* {
|
||
|
|
* _lseek(tempHandle,(pringDescriptor->fileSize - 1),SEEK_SET);
|
||
|
|
*
|
||
|
|
* if (_write(tempHandle,&tempHandle,1) != 1)
|
||
|
|
* {
|
||
|
|
* _close(tempHandle);
|
||
|
|
* remove("C:\\ldi_temp.$$$");
|
||
|
|
* tempHandle = -1;
|
||
|
|
* }
|
||
|
|
* }
|
||
|
|
*
|
||
|
|
* return(tempHandle);
|
||
|
|
* }
|
||
|
|
* else
|
||
|
|
* {
|
||
|
|
* * LDI only will call with *pszFile == '*' *
|
||
|
|
* }
|
||
|
|
* }
|
||
|
|
*
|
||
|
|
* The callback provider must watch for the corresponding PFNCLOSE call on
|
||
|
|
* the returned handle, and delete the created file after closing. (The
|
||
|
|
* file handle and file name assigned to the temporary file must be tracked;
|
||
|
|
* a close operation on that handle must be trapped, so the temporary file
|
||
|
|
* can be deleted as well.)
|
||
|
|
*
|
||
|
|
* The client does not need to worry about multiple concurrent opens of the
|
||
|
|
* temporary file, or more than a single temporary file (from LDI).
|
||
|
|
*
|
||
|
|
* int FAR DIAMONDAPI MyClose(int handle)
|
||
|
|
* {
|
||
|
|
* int result;
|
||
|
|
*
|
||
|
|
* result = _close(handle);
|
||
|
|
*
|
||
|
|
* if (handle == tempHandle)
|
||
|
|
* {
|
||
|
|
* remove("C:\\ldi_temp.$$$");
|
||
|
|
* tempHandle = -1;
|
||
|
|
* }
|
||
|
|
*
|
||
|
|
* return(result);
|
||
|
|
* }
|
||
|
|
*/
|
||
|
|
typedef INT_PTR (FAR DIAMONDAPI *PFNOPEN) (char FAR *pszFile,int oflag,int pmode);
|
||
|
|
typedef UINT (FAR DIAMONDAPI *PFNREAD) (INT_PTR hf, void FAR *pv, UINT cb);
|
||
|
|
typedef UINT (FAR DIAMONDAPI *PFNWRITE)(INT_PTR hf, void FAR *pv, UINT cb);
|
||
|
|
typedef int (FAR DIAMONDAPI *PFNCLOSE)(INT_PTR hf);
|
||
|
|
typedef long (FAR DIAMONDAPI *PFNSEEK) (INT_PTR hf, long dist, int seektype);
|
||
|
|
|
||
|
|
|
||
|
|
/* --- LDI-defined types -------------------------------------------------- */
|
||
|
|
|
||
|
|
/* LDI_CONTEXT_HANDLE - Handle to a LDI decompression context */
|
||
|
|
|
||
|
|
typedef MHANDLE LDI_CONTEXT_HANDLE; /* hmd */
|
||
|
|
|
||
|
|
|
||
|
|
/*** PFNALLOC - Memory allocation function for LDI
|
||
|
|
*
|
||
|
|
* Entry:
|
||
|
|
* cb - Size in bytes of memory block to allocate
|
||
|
|
*
|
||
|
|
* Exit-Success:
|
||
|
|
* Returns !NULL pointer to memory block
|
||
|
|
*
|
||
|
|
* Exit-Failure:
|
||
|
|
* Returns NULL; insufficient memory
|
||
|
|
*/
|
||
|
|
#ifndef _PFNALLOC_DEFINED
|
||
|
|
#define _PFNALLOC_DEFINED
|
||
|
|
typedef MI_MEMORY (FAR DIAMONDAPI *PFNALLOC)(ULONG cb); /* pfnma */
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
/*** PFNFREE - Free memory function for LDI
|
||
|
|
*
|
||
|
|
* Entry:
|
||
|
|
* pv - Memory block allocated by matching PFNALLOC function
|
||
|
|
*
|
||
|
|
* Exit:
|
||
|
|
* Memory block freed.
|
||
|
|
*/
|
||
|
|
#ifndef _PFNFREE_DEFINED
|
||
|
|
#define _PFNFREE_DEFINED
|
||
|
|
typedef void (FAR DIAMONDAPI *PFNFREE)(MI_MEMORY pv); /* pfnmf */
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* --- prototypes --------------------------------------------------------- */
|
||
|
|
|
||
|
|
/*** LDICreateDecompression - Create LDI decompression context
|
||
|
|
*
|
||
|
|
* Entry:
|
||
|
|
* pcbDataBlockMax *largest uncompressed data block size expected,
|
||
|
|
* gets largest uncompressed data block allowed
|
||
|
|
* pvConfiguration passes implementation-specific info to decompressor.
|
||
|
|
* pfnma memory allocation function pointer
|
||
|
|
* pfnmf memory free function pointer
|
||
|
|
* pcbSrcBufferMin gets max compressed buffer size
|
||
|
|
* pmdhHandle gets newly-created context's handle
|
||
|
|
* pfnopen file open function pointer (or NULL)
|
||
|
|
* pfnread file read function pointer (or don't care)
|
||
|
|
* pfnwrite file write function pointer (or don't care)
|
||
|
|
* pfnclose file close function pointer (or don't care)
|
||
|
|
* pfnseek file seek function pointer (or don't care)
|
||
|
|
*
|
||
|
|
* If NULL is provided for pfnopen, and the ring buffer cannot be
|
||
|
|
* created via pfnma, LDICreateDecompression will fail.
|
||
|
|
*
|
||
|
|
* If pmdhHandle==NULL, *pcbDataBlockMax and *pcbSrcBufferMin will be
|
||
|
|
* filled in, but no context will be created. This query will allow
|
||
|
|
* the caller to determine required buffer sizes before creating a
|
||
|
|
* context.
|
||
|
|
*
|
||
|
|
* Exit-Success:
|
||
|
|
* Returns MDI_ERROR_NO_ERROR;
|
||
|
|
* *pcbDataBlockMax, *pcbSrcBufferMin, *pmdhHandle filled in.
|
||
|
|
*
|
||
|
|
* Exit-Failure:
|
||
|
|
* MDI_ERROR_NOT_ENOUGH_MEMORY, could not allocate enough memory.
|
||
|
|
* MDI_ERROR_BAD_PARAMETERS, something wrong with parameters.
|
||
|
|
* *pcbDataBlockMax, *pcbSrcBufferMin, *pmdhHandle undefined.
|
||
|
|
*/
|
||
|
|
int FAR DIAMONDAPI LDICreateDecompression(
|
||
|
|
UINT FAR * pcbDataBlockMax, /* max uncompressed data block size */
|
||
|
|
void FAR * pvConfiguration, /* implementation-defined */
|
||
|
|
PFNALLOC pfnma, /* Memory allocation function ptr */
|
||
|
|
PFNFREE pfnmf, /* Memory free function ptr */
|
||
|
|
UINT FAR * pcbSrcBufferMin, /* gets max. comp. buffer size */
|
||
|
|
LDI_CONTEXT_HANDLE FAR * pmdhHandle, /* gets newly-created handle */
|
||
|
|
PFNOPEN pfnopen, /* open a file callback */
|
||
|
|
PFNREAD pfnread, /* read a file callback */
|
||
|
|
PFNWRITE pfnwrite, /* write a file callback */
|
||
|
|
PFNCLOSE pfnclose, /* close a file callback */
|
||
|
|
PFNSEEK pfnseek); /* seek in file callback */
|
||
|
|
|
||
|
|
|
||
|
|
/*** LDIDecompress - Decompress a block of data
|
||
|
|
*
|
||
|
|
* Entry:
|
||
|
|
* hmd handle to decompression context
|
||
|
|
* pbSrc source buffer (compressed data)
|
||
|
|
* cbSrc compressed size of data to be decompressed
|
||
|
|
* pbDst destination buffer (for decompressed data)
|
||
|
|
* *pcbDecompressed (ptr to UINT) the expected de-compressed size
|
||
|
|
* of this data block. (same as cbSrc from the
|
||
|
|
* LCICompress() call.).
|
||
|
|
*
|
||
|
|
* Exit-Success:
|
||
|
|
* Returns MDI_ERROR_NO_ERROR;
|
||
|
|
* *pcbDecompressed has size of decompressed data in pbDst.
|
||
|
|
* Decompression context updated.
|
||
|
|
*
|
||
|
|
* Exit-Failure:
|
||
|
|
* MDI_ERROR_BAD_PARAMETERS, something wrong with parameters.
|
||
|
|
* MDI_ERROR_BUFFER_OVERFLOW, cbSrc is too small to yield the
|
||
|
|
* requested *pcbDecompressed count. cbSrc before LDIDecompressed
|
||
|
|
* should always equal *pcbResult after QCICompress(), and
|
||
|
|
* *pcbDecompressed before LDIDecompress should always equal the
|
||
|
|
* cbSrc before QCICompress().
|
||
|
|
* MDI_ERROR_FAILED, either cbSrc is too small, *pcbDecompressed is too
|
||
|
|
* large, or *pbSrc is corrupt.
|
||
|
|
*
|
||
|
|
* Note:
|
||
|
|
* Set your cbDecompressed to the expected de-compressed size of this
|
||
|
|
* data block, then call LDIDecompress() with the address of your
|
||
|
|
* cbDecompressed.
|
||
|
|
*/
|
||
|
|
int FAR DIAMONDAPI LDIDecompress(
|
||
|
|
LDI_CONTEXT_HANDLE hmd, /* decompression context */
|
||
|
|
void FAR * pbSrc, /* source buffer */
|
||
|
|
UINT cbSrc, /* source data size */
|
||
|
|
void FAR * pbDst, /* target buffer */
|
||
|
|
UINT FAR * pcbDecompressed); /* target data size */
|
||
|
|
|
||
|
|
|
||
|
|
/*** LDIResetDecompression - Reset decompression history (if any)
|
||
|
|
*
|
||
|
|
* De-compression can only be started on a block which was compressed
|
||
|
|
* immediately following a MCICreateCompression() or MCIResetCompression()
|
||
|
|
* call. This function provides notification to the decompressor that the
|
||
|
|
* next compressed block begins on a compression boundary.
|
||
|
|
*
|
||
|
|
* Entry:
|
||
|
|
* hmd - handle to decompression context
|
||
|
|
*
|
||
|
|
* Exit-Success:
|
||
|
|
* Returns MDI_ERROR_NO_ERROR;
|
||
|
|
* Decompression context reset.
|
||
|
|
*
|
||
|
|
* Exit-Failure:
|
||
|
|
* Returns MDI_ERROR_BAD_PARAMETERS, invalid context handle.
|
||
|
|
*/
|
||
|
|
int FAR DIAMONDAPI LDIResetDecompression(LDI_CONTEXT_HANDLE hmd);
|
||
|
|
|
||
|
|
|
||
|
|
/*** LDIDestroyDecompression - Destroy LDI decompression context
|
||
|
|
*
|
||
|
|
* Entry:
|
||
|
|
* hmd - handle to decompression context
|
||
|
|
*
|
||
|
|
* Exit-Success:
|
||
|
|
* Returns MDI_ERROR_NO_ERROR;
|
||
|
|
* Decompression context destroyed.
|
||
|
|
*
|
||
|
|
* Exit-Failure:
|
||
|
|
* Returns MDI_ERROR_BAD_PARAMETERS, invalid context handle.
|
||
|
|
*/
|
||
|
|
int FAR DIAMONDAPI LDIDestroyDecompression(LDI_CONTEXT_HANDLE hmd);
|
||
|
|
|
||
|
|
|
||
|
|
#ifndef BIT16
|
||
|
|
int FAR DIAMONDAPI LDIGetWindow(
|
||
|
|
LDI_CONTEXT_HANDLE hmd, /* decompression context */
|
||
|
|
BYTE FAR ** ppWindow, /* pointer to window start */
|
||
|
|
long * pFileOffset, /* offset in folder */
|
||
|
|
long * pWindowOffset, /* offset in window */
|
||
|
|
long * pcbBytesAvail); /* bytes avail from window start */
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
/* --- constants ---------------------------------------------------------- */
|
||
|
|
|
||
|
|
/* return codes */
|
||
|
|
|
||
|
|
#define MDI_ERROR_NO_ERROR 0
|
||
|
|
#define MDI_ERROR_NOT_ENOUGH_MEMORY 1
|
||
|
|
#define MDI_ERROR_BAD_PARAMETERS 2
|
||
|
|
#define MDI_ERROR_BUFFER_OVERFLOW 3
|
||
|
|
#define MDI_ERROR_FAILED 4
|
||
|
|
#define MDI_ERROR_CONFIGURATION 5
|
||
|
|
|
||
|
|
/* --- LZX configuration details ------------------------------------- */
|
||
|
|
|
||
|
|
/*** LZX pvConfiguration structure
|
||
|
|
*
|
||
|
|
* For the LZX decompressor, two parameters are configurable, the
|
||
|
|
* "window bits", which defines the size of the buffer needed by the
|
||
|
|
* the decompressor (must match the value used to compress), and the CPU
|
||
|
|
* type, which controls whether 386 opcodes will be used or not. If
|
||
|
|
* "unknown" is provided for the fCPUtype, LDI will attempt to determine
|
||
|
|
* the CPU type itself, which could fail or produce system faults on
|
||
|
|
* non-DOS platforms (like Windows.) Windows apps should use GetWinFlags()
|
||
|
|
* or a similiar method, and never pass "unknown".
|
||
|
|
*
|
||
|
|
* pvConfiguration points to this structure.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#pragma pack (1)
|
||
|
|
|
||
|
|
typedef struct {
|
||
|
|
long WindowSize; /* buffersize */
|
||
|
|
long fCPUtype; /* controls internal code selection */
|
||
|
|
} LZXDECOMPRESS; /* qdec */
|
||
|
|
|
||
|
|
#pragma pack ()
|
||
|
|
|
||
|
|
typedef LZXDECOMPRESS *PLZXDECOMPRESS; /* pldec */
|
||
|
|
typedef LZXDECOMPRESS FAR *PFLZXDECOMPRESS; /* pfldec */
|
||
|
|
|
||
|
|
/* WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
|
||
|
|
*
|
||
|
|
* LDI_CPU_UNKNOWN detection does *not* work when running under Windows
|
||
|
|
* in 286 protected mode! Call GetWinFlags() to determine
|
||
|
|
* the CPU type and pass it explicitly!
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define LDI_CPU_UNKNOWN (-1) /* internally determined */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define LDI_CPU_80286 (0) /* '286 opcodes only */
|
||
|
|
#define LDI_CPU_80386 (1) /* '386 opcodes used */
|
||
|
|
#define LDI_CPU_CONSERVATIVE (LDI_CPU_80286)
|
||
|
|
|
||
|
|
/* ----------------------------------------------------------------------- */
|