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