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142 lines
3.2 KiB
142 lines
3.2 KiB
/*
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** copylz.c - CopyLZFile() and buffer management functions.
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**
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** Author: DavidDi
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**
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** This module is compiled twice - once with LZA_DLL defined for the Windows
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** DLL, and once without LZDLL defined for static DOS library.
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*/
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// Headers
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///////////
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#include <basedll.h>
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#define LZA_DLL
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#include "lz_common.h"
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#include "lz_buffers.h"
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#include "lz_header.h"
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#include "lzpriv.h"
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/*
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** int APIENTRY LZStart(void);
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**
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** If the global buffers are not already initialized, allocates buffers in
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** preparation for calls to CopyLZFile(). Increments the global buffer lock
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** count. Sets the global buffers' base pointers and lengths.
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**
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** Arguments: void
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**
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** Returns: int - TRUE if successful. LZERROR_GLOBALLOC if unsuccessful.
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**
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** Globals: none
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*/
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INT APIENTRY LZStart(VOID)
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{
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return(TRUE);
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}
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/*
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** VOID APIENTRY LZDone(void);
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**
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** If any of the global buffers have not already been freed, frees them and
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** resets the buffers' base array pointers to NULL. Decrements the global
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** buffer lock count.
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**
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** Arguments: void
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**
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** Returns: VOID
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**
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** Globals: none
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*/
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VOID APIENTRY LZDone(VOID)
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{
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return;
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}
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/*
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** CopyLZFile()
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**
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** Alias for LZCopy(). Originally, LZCopy() and
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** CopyLZFile() were intended for different purposes, but they were confused
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** and misused so much they were made identical.
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*/
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LONG APIENTRY CopyLZFile(HFILE doshSource, HFILE doshDest)
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{
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return(LZCopy(doshSource, doshDest));
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}
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/*
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** LZCopy()
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**
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** Expand a compressed file, or copy an uncompressed file.
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**
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** Arguments: doshSource - source DOS file handle
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** doshDest - destination DOS file handle
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**
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** Returns: LONG - Number of bytes written if copy was successful.
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** One of the LZERROR_ codes if unsuccessful.
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**
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** Globals: none
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*/
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LONG APIENTRY LZCopy(HFILE doshSource, HFILE doshDest)
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{
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INT f;
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LONG lRetVal;
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PLZINFO pLZI;
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// If it's a compressed file handle, translate to a DOS handle.
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if (doshSource >= LZ_TABLE_BIAS)
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{
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LZFile *lpLZ; // pointer to LZFile struct
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HANDLE hLZFile; // handle to LZFile struct
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if ((hLZFile = rghLZFileTable[doshSource - LZ_TABLE_BIAS]) == NULL)
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{
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return(LZERROR_BADINHANDLE);
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}
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if ((lpLZ = (LZFile *)GlobalLock(hLZFile)) == NULL)
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{
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return(LZERROR_GLOBLOCK);
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}
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doshSource = lpLZ->dosh;
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doshDest = ConvertDosFHToWin32(doshDest);
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GlobalUnlock(hLZFile);
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}
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else {
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doshDest = ConvertDosFHToWin32(doshDest);
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doshSource = ConvertDosFHToWin32(doshSource);
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}
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// Initialize buffers
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pLZI = InitGlobalBuffersEx();
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if (!pLZI) {
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return(LZERROR_GLOBALLOC);
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}
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ResetBuffers();
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// Expand / copy file.
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if ((f = ExpandOrCopyFile(doshSource, doshDest, pLZI)) != TRUE) {
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// Expansion / copy failed.
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lRetVal = (LONG)f;
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} else {
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// Expansion / copy successful - return number of bytes written.
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lRetVal = pLZI->cblOutSize;
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}
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// Free global buffers.
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FreeGlobalBuffers(pLZI);
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return(lRetVal);
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}
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