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Shipwright/StormLib/src/SFileOpenFileEx.cpp
Nicholas Estelami b3e299dbde Replaced StormLib .lib files with source code. 
Some modifications to handle backslashes and forward slashes, along with some optimizations to speed up OTR generation.
2022-06-16 20:35:52 -04:00

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/*****************************************************************************/
/* SFileOpenFileEx.cpp Copyright (c) Ladislav Zezula 2003 */
/*---------------------------------------------------------------------------*/
/* Description : */
/*---------------------------------------------------------------------------*/
/* Date Ver Who Comment */
/* -------- ---- --- ------- */
/* xx.xx.99 1.00 Lad The first version of SFileOpenFileEx.cpp */
/*****************************************************************************/
#define __STORMLIB_SELF__
#include "StormLib.h"
#include "StormCommon.h"
/*****************************************************************************/
/* Local functions */
/*****************************************************************************/
static DWORD FindHashIndex(TMPQArchive * ha, DWORD dwFileIndex)
{
TMPQHash * pHashTableEnd;
TMPQHash * pHash;
DWORD dwFirstIndex = HASH_ENTRY_FREE;
// Should only be called if the archive has hash table
assert(ha->pHashTable != NULL);
// Multiple hash table entries can point to the file table entry.
// We need to search all of them
pHashTableEnd = ha->pHashTable + ha->pHeader->dwHashTableSize;
for(pHash = ha->pHashTable; pHash < pHashTableEnd; pHash++)
{
if(MPQ_BLOCK_INDEX(pHash) == dwFileIndex)
{
// Duplicate hash entry found
if(dwFirstIndex != HASH_ENTRY_FREE)
return HASH_ENTRY_FREE;
dwFirstIndex = (DWORD)(pHash - ha->pHashTable);
}
}
// Return the hash table entry index
return dwFirstIndex;
}
static const char * GetPatchFileName(TMPQArchive * ha, const char * szFileName, char * szBuffer)
{
TMPQNamePrefix * pPrefix;
// Are there patches in the current MPQ?
if(ha->dwFlags & MPQ_FLAG_PATCH)
{
// The patch prefix must be already known here
assert(ha->pPatchPrefix != NULL);
pPrefix = ha->pPatchPrefix;
// The patch name for "OldWorld\\XXX\\YYY" is "Base\\XXX\YYY"
// We need to remove the "OldWorld\\" prefix
if(!_strnicmp(szFileName, "OldWorld\\", 9))
szFileName += 9;
// Create the file name from the known patch entry
memcpy(szBuffer, pPrefix->szPatchPrefix, pPrefix->nLength);
strcpy(szBuffer + pPrefix->nLength, szFileName);
szFileName = szBuffer;
}
return szFileName;
}
static bool OpenLocalFile(const char * szFileName, HANDLE * PtrFile)
{
TFileStream * pStream;
TMPQFile * hf = NULL;
TCHAR szFileNameT[MAX_PATH];
// Convert the file name to UNICODE (if needed)
StringCopy(szFileNameT, _countof(szFileNameT), szFileName);
// Open the file and create the TMPQFile structure
pStream = FileStream_OpenFile(szFileNameT, STREAM_FLAG_READ_ONLY);
if(pStream != NULL)
{
// Allocate and initialize file handle
hf = CreateFileHandle(NULL, NULL);
if(hf != NULL)
{
hf->pStream = pStream;
*PtrFile = hf;
return true;
}
else
{
FileStream_Close(pStream);
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
}
}
*PtrFile = NULL;
return false;
}
bool OpenPatchedFile(HANDLE hMpq, const char * szFileName, HANDLE * PtrFile)
{
TMPQArchive * haBase = NULL;
TMPQArchive * ha = (TMPQArchive *)hMpq;
TFileEntry * pFileEntry;
TMPQFile * hfPatch; // Pointer to patch file
TMPQFile * hfBase = NULL; // Pointer to base open file
TMPQFile * hf = NULL;
HANDLE hPatchFile;
char szNameBuffer[MAX_PATH];
// First of all, find the latest archive where the file is in base version
// (i.e. where the original, unpatched version of the file exists)
while(ha != NULL)
{
// If the file is there, then we remember the archive
pFileEntry = GetFileEntryExact(ha, GetPatchFileName(ha, szFileName, szNameBuffer), 0, NULL);
if(pFileEntry != NULL && (pFileEntry->dwFlags & MPQ_FILE_PATCH_FILE) == 0)
haBase = ha;
// Move to the patch archive
ha = ha->haPatch;
}
// If we couldn't find the base file in any of the patches, it doesn't exist
if((ha = haBase) != NULL)
{
// Now open the base file
if(SFileOpenFileEx((HANDLE)ha, GetPatchFileName(ha, szFileName, szNameBuffer), SFILE_OPEN_BASE_FILE, (HANDLE *)&hfBase))
{
// The file must be a base file, i.e. without MPQ_FILE_PATCH_FILE
assert((hfBase->pFileEntry->dwFlags & MPQ_FILE_PATCH_FILE) == 0);
hf = hfBase;
// Now open all patches and attach them on top of the base file
for(ha = ha->haPatch; ha != NULL; ha = ha->haPatch)
{
// Prepare the file name with a correct prefix
if(SFileOpenFileEx((HANDLE)ha, GetPatchFileName(ha, szFileName, szNameBuffer), SFILE_OPEN_BASE_FILE, &hPatchFile))
{
// Remember the new version
hfPatch = (TMPQFile *)hPatchFile;
// We should not find patch file
assert((hfPatch->pFileEntry->dwFlags & MPQ_FILE_PATCH_FILE) != 0);
// Attach the patch to the base file
hf->hfPatch = hfPatch;
hf = hfPatch;
}
}
}
}
else
{
SetLastError(ERROR_FILE_NOT_FOUND);
}
// Give the updated base MPQ
if(PtrFile != NULL)
*PtrFile = (HANDLE)hfBase;
return (hfBase != NULL);
}
/*****************************************************************************/
/* Public functions */
/*****************************************************************************/
//-----------------------------------------------------------------------------
// SFileEnumLocales enums all locale versions within MPQ.
// Functions fills all available language identifiers on a file into the buffer
// pointed by plcLocales. There must be enough entries to copy the localed,
// otherwise the function returns ERROR_INSUFFICIENT_BUFFER.
DWORD WINAPI SFileEnumLocales(
HANDLE hMpq,
const char * szFileName,
LCID * PtrLocales,
LPDWORD PtrMaxLocales,
DWORD dwSearchScope)
{
TMPQArchive * ha = (TMPQArchive *)hMpq;
TMPQHash * pFirstHash;
TMPQHash * pHash;
DWORD dwFileIndex = 0;
DWORD dwMaxLocales;
DWORD dwLocales = 0;
// Test the parameters
if(!IsValidMpqHandle(hMpq))
return ERROR_INVALID_HANDLE;
if(szFileName == NULL || *szFileName == 0)
return ERROR_INVALID_PARAMETER;
if(ha->pHashTable == NULL)
return ERROR_NOT_SUPPORTED;
if(PtrMaxLocales == NULL)
return ERROR_INVALID_PARAMETER;
if(IsPseudoFileName(szFileName, &dwFileIndex))
return ERROR_INVALID_PARAMETER;
// Keep compiler happy
dwMaxLocales = PtrMaxLocales[0];
dwSearchScope = dwSearchScope;
// Parse all files with that name
pFirstHash = pHash = GetFirstHashEntry(ha, szFileName);
while(pHash != NULL)
{
// Put the locales to the buffer
if(PtrLocales != NULL && dwLocales < dwMaxLocales)
*PtrLocales++ = pHash->lcLocale;
dwLocales++;
// Get the next locale
pHash = GetNextHashEntry(ha, pFirstHash, pHash);
}
// Give the caller the number of locales and return
PtrMaxLocales[0] = dwLocales;
return (dwLocales <= dwMaxLocales) ? ERROR_SUCCESS : ERROR_INSUFFICIENT_BUFFER;
}
//-----------------------------------------------------------------------------
// SFileOpenFileEx
//
// hMpq - Handle of opened MPQ archive
// szFileName - Name of file to open
// dwSearchScope - Where to search
// PtrFile - Pointer to store opened file handle
bool WINAPI SFileOpenFileEx(HANDLE hMpq, const char * szFileName, DWORD dwSearchScope, HANDLE * PtrFile)
{
TMPQArchive * ha = IsValidMpqHandle(hMpq);
TFileEntry * pFileEntry = NULL;
TMPQFile * hf = NULL;
DWORD dwHashIndex = HASH_ENTRY_FREE;
DWORD dwFileIndex = 0;
DWORD dwErrCode = ERROR_SUCCESS;
bool bOpenByIndex = false;
// Don't accept NULL pointer to file handle
if(szFileName == NULL || *szFileName == 0)
dwErrCode = ERROR_INVALID_PARAMETER;
// When opening a file from MPQ, the handle must be valid
if(dwSearchScope != SFILE_OPEN_LOCAL_FILE && ha == NULL)
dwErrCode = ERROR_INVALID_HANDLE;
// When not checking for existence, the pointer to file handle must be valid
if(dwSearchScope != SFILE_OPEN_CHECK_EXISTS && PtrFile == NULL)
dwErrCode = ERROR_INVALID_PARAMETER;
// Prepare the file opening
if(dwErrCode == ERROR_SUCCESS)
{
switch(dwSearchScope)
{
case SFILE_OPEN_FROM_MPQ:
case SFILE_OPEN_BASE_FILE:
case SFILE_OPEN_CHECK_EXISTS:
// If this MPQ has no patches, open the file from this MPQ directly
if(ha->haPatch == NULL || dwSearchScope == SFILE_OPEN_BASE_FILE)
{
pFileEntry = GetFileEntryLocale2(ha, szFileName, g_lcFileLocale, &dwHashIndex);
}
// If this MPQ is a patched archive, open the file as patched
else
{
return OpenPatchedFile(hMpq, szFileName, PtrFile);
}
break;
case SFILE_OPEN_ANY_LOCALE:
// This open option is reserved for opening MPQ internal listfile.
// No argument validation. Tries to open file with neutral locale first,
// then any other available.
pFileEntry = GetFileEntryLocale2(ha, szFileName, 0, &dwHashIndex);
break;
case SFILE_OPEN_LOCAL_FILE:
// Open a local file
return OpenLocalFile(szFileName, PtrFile);
default:
// Don't accept any other value
dwErrCode = ERROR_INVALID_PARAMETER;
break;
}
}
// Check whether the file really exists in the MPQ
if(dwErrCode == ERROR_SUCCESS)
{
// If we didn't find the file, try to open it using pseudo file name ("File
if (pFileEntry == NULL || (pFileEntry->dwFlags & MPQ_FILE_EXISTS) == 0)
{
// Check the pseudo-file name ("File00000001.ext")
if ((bOpenByIndex = IsPseudoFileName(szFileName, &dwFileIndex)) == true)
{
// Get the file entry for the file
if (dwFileIndex < ha->dwFileTableSize)
{
pFileEntry = ha->pFileTable + dwFileIndex;
}
}
// Still not found?
if (pFileEntry == NULL)
{
dwErrCode = ERROR_FILE_NOT_FOUND;
}
}
// Perform some checks of invalid files
if (pFileEntry != NULL)
{
// MPQ protectors use insanely amount of fake files, often with very high size.
// We won't open any files whose compressed size is bigger than archive size
// If the file is not compressed, its size cannot be bigger than archive size
if ((pFileEntry->dwFlags & MPQ_FILE_COMPRESS_MASK) == 0 && (pFileEntry->dwFileSize > ha->FileSize))
{
dwErrCode = ERROR_FILE_CORRUPT;
pFileEntry = NULL;
}
// Ignore unknown loading flags (example: MPQ_2016_v1_WME4_4.w3x)
// if(pFileEntry->dwFlags & ~MPQ_FILE_VALID_FLAGS)
// {
// dwErrCode = ERROR_NOT_SUPPORTED;
// pFileEntry = NULL;
// }
}
}
// Did the caller just wanted to know if the file exists?
if(dwErrCode == ERROR_SUCCESS && dwSearchScope != SFILE_OPEN_CHECK_EXISTS)
{
// Allocate file handle
hf = CreateFileHandle(ha, pFileEntry);
if(hf != NULL)
{
// Get the hash index for the file
if(ha->pHashTable != NULL && dwHashIndex == HASH_ENTRY_FREE)
dwHashIndex = FindHashIndex(ha, dwFileIndex);
if(dwHashIndex != HASH_ENTRY_FREE)
hf->pHashEntry = ha->pHashTable + dwHashIndex;
hf->dwHashIndex = dwHashIndex;
// If the MPQ has sector CRC enabled, enable if for the file
if(ha->dwFlags & MPQ_FLAG_CHECK_SECTOR_CRC)
hf->bCheckSectorCRCs = true;
// If we know the real file name, copy it to the file entry
if(bOpenByIndex == false)
{
// If there is no file name yet, allocate it
AllocateFileName(ha, pFileEntry, szFileName);
// If the file is encrypted, we should detect the file key
if(pFileEntry->dwFlags & MPQ_FILE_ENCRYPTED)
{
hf->dwFileKey = DecryptFileKey(szFileName,
pFileEntry->ByteOffset,
pFileEntry->dwFileSize,
pFileEntry->dwFlags);
}
}
}
else
{
dwErrCode = ERROR_NOT_ENOUGH_MEMORY;
}
}
// Give the file entry
if(PtrFile != NULL)
PtrFile[0] = hf;
// Return error code
if(dwErrCode != ERROR_SUCCESS)
SetLastError(dwErrCode);
return (dwErrCode == ERROR_SUCCESS);
}
//-----------------------------------------------------------------------------
// SFileHasFile
//
// hMpq - Handle of opened MPQ archive
// szFileName - Name of file to look for
bool WINAPI SFileHasFile(HANDLE hMpq, const char * szFileName)
{
return SFileOpenFileEx(hMpq, szFileName, SFILE_OPEN_CHECK_EXISTS, NULL);
}
//-----------------------------------------------------------------------------
// bool WINAPI SFileCloseFile(HANDLE hFile);
bool WINAPI SFileCloseFile(HANDLE hFile)
{
TMPQFile * hf = (TMPQFile *)hFile;
if(!IsValidFileHandle(hFile))
{
SetLastError(ERROR_INVALID_HANDLE);
return false;
}
// Free the structure
FreeFileHandle(hf);
return true;
}
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