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CascMndxRoot.cpp
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CascMndxRoot.cpp
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/*****************************************************************************/
/* CascMndxRoot.cpp Copyright (c) Ladislav Zezula 2014 */
/*---------------------------------------------------------------------------*/
/* Common functions for CascLib */
/* Note: "HOTS" refers to Play.exe, v2.5.0.29049 (Heroes of the Storm Alpha) */
/*---------------------------------------------------------------------------*/
/* Date Ver Who Comment */
/* -------- ---- --- ------- */
/* 18.05.14 1.00 Lad The first version of CascMndxRoot.cpp */
/*****************************************************************************/
#define __CASCLIB_SELF__
#include "CascLib.h"
#include "CascCommon.h"
#include "CascMndxRoot.h"
//-----------------------------------------------------------------------------
// Local defines
#define CASC_MAR_SIGNATURE 0x0052414d // 'MAR\0'
//-----------------------------------------------------------------------------
// Local structures
typedef struct _FILE_MNDX_HEADER
{
DWORD Signature; // 'MNDX'
DWORD HeaderVersion; // Must be <= 2
DWORD FormatVersion;
} FILE_MNDX_HEADER, *PFILE_MNDX_HEADER;
typedef struct _FILE_MAR_INFO
{
DWORD MarIndex;
DWORD MarDataSize;
DWORD MarDataSizeHi;
DWORD MarDataOffset;
DWORD MarDataOffsetHi;
} FILE_MAR_INFO, *PFILE_MAR_INFO;
//-----------------------------------------------------------------------------
// Testing functions prototypes
#if defined(_DEBUG) && defined(_X86_) && defined(CASCLIB_TEST)
extern "C" bool _cdecl sub_1958B00_x86(TFileNameDatabase * pDB, TMndxFindResult * pStruct1C);
void TestMndxRootFile(PCASC_MNDX_INFO pMndxInfo);
#endif
//-----------------------------------------------------------------------------
// Local variables
unsigned char table_1BA1818[0x800] =
{
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//-----------------------------------------------------------------------------
// Local functions - Number of set bits in an integer
// HOTS: inlined
DWORD GetNumberOfSetBits(DWORD Value32)
{
Value32 = ((Value32 >> 1) & 0x55555555) + (Value32 & 0x55555555);
Value32 = ((Value32 >> 2) & 0x33333333) + (Value32 & 0x33333333);
Value32 = ((Value32 >> 4) & 0x0F0F0F0F) + (Value32 & 0x0F0F0F0F);
return (Value32 * 0x01010101);
}
#define GetNumbrOfSetBits32(x) (GetNumberOfSetBits(x) >> 0x18)
//-----------------------------------------------------------------------------
// Local functions - common
static bool RootFileRead(LPBYTE pbFilePointer, LPBYTE pbFileEnd, void * pvBuffer, size_t dwBytesToRead)
{
if((size_t)(pbFileEnd - pbFilePointer) < dwBytesToRead)
return false;
memcpy(pvBuffer, pbFilePointer, dwBytesToRead);
return true;
}
//-----------------------------------------------------------------------------
// Local functions - TMndxFindResult
// HOTS: 01956EE0
TMndxFindResult::TMndxFindResult()
{
szSearchMask = NULL;
cchSearchMask = 0;
field_8 = 0;
szFoundPath = NULL;
cchFoundPath = 0;
FileNameIndex = 0;
pStruct40 = NULL;
}
// HOTS: 01956F00
TMndxFindResult::~TMndxFindResult()
{
FreeStruct40();
}
// HOTS: 01956F30
int TMndxFindResult::CreateStruct40()
{
if(pStruct40 != NULL)
return ERROR_INVALID_PARAMETER;
pStruct40 = new TStruct40();
return (pStruct40 != NULL) ? ERROR_SUCCESS : ERROR_NOT_ENOUGH_MEMORY;
}
void TMndxFindResult::FreeStruct40()
{
if(pStruct40 != NULL)
delete pStruct40;
pStruct40 = NULL;
}
// HOTS: 01956E70
int TMndxFindResult::SetSearchPath(
const char * szNewSearchMask,
size_t cchNewSearchMask)
{
if(szSearchMask == NULL && cchSearchMask != 0)
return ERROR_INVALID_PARAMETER;
if(pStruct40 != NULL)
pStruct40->SearchPhase = CASC_SEARCH_INITIALIZING;
szSearchMask = szNewSearchMask;
cchSearchMask = cchNewSearchMask;
return ERROR_SUCCESS;
}
//-----------------------------------------------------------------------------
// TByteStream functions
// HOTS: 01959990
TByteStream::TByteStream()
{
pbByteData = NULL;
pvMappedFile = NULL;
cbByteData = 0;
field_C = 0;
hFile = 0;
hMap = 0;
}
// HOTS: 19599F0
void TByteStream::ExchangeWith(TByteStream & Target)
{
TByteStream WorkBuff;
WorkBuff = *this;
*this = Target;
Target = WorkBuff;
}
// HOTS: 19599F0
int TByteStream::GetBytes(DWORD cbByteCount, PARRAY_POINTER PtrArray)
{
if(cbByteData < cbByteCount)
return ERROR_BAD_FORMAT;
// Give the buffer to the caller
PtrArray->Bytes = pbByteData;
// Move pointers
pbByteData += cbByteCount;
cbByteData -= cbByteCount;
return ERROR_SUCCESS;
}
// HOTS: 1957190
int TByteStream::GetArray_DWORDs(PARRAY_POINTER PtrArray, DWORD ItemCount)
{
if(PtrArray == NULL && ItemCount != 0)
return ERROR_INVALID_PARAMETER;
if(ItemCount > CASC_MAX_ENTRIES(DWORD))
return ERROR_NOT_ENOUGH_MEMORY;
return GetBytes(ItemCount * 4, PtrArray);
}
// HOTS: 19571E0
int TByteStream::GetArray_Triplets(PARRAY_POINTER PtrArray, DWORD ItemCount)
{
if(PtrArray == NULL && ItemCount != 0)
return ERROR_INVALID_PARAMETER;
if(ItemCount > CASC_MAX_ENTRIES(TRIPLET))
return ERROR_NOT_ENOUGH_MEMORY;
return GetBytes(ItemCount * sizeof(TRIPLET), PtrArray);
}
// HOTS: 1957230
int TByteStream::GetArray_BYTES(PARRAY_POINTER PtrArray, DWORD ItemCount)
{
if(PtrArray == NULL && ItemCount != 0)
return ERROR_INVALID_PARAMETER;
if(ItemCount > CASC_MAX_ENTRIES(BYTE))
return ERROR_NOT_ENOUGH_MEMORY;
return GetBytes(ItemCount, PtrArray);
}
// HOTS: 1957280
int TByteStream::GetArray_NameTable(PARRAY_POINTER PtrArray, DWORD ItemCount)
{
if(PtrArray == NULL && ItemCount != 0)
return ERROR_INVALID_PARAMETER;
if(ItemCount > CASC_MAX_ENTRIES(NAME_FRAG))
return ERROR_NOT_ENOUGH_MEMORY;
return GetBytes(ItemCount * sizeof(NAME_FRAG), PtrArray);
}
// HOTS: 1959A60
int TByteStream::SkipBytes(DWORD cbByteCount)
{
ARRAY_POINTER Dummy;
return GetBytes(cbByteCount, &Dummy);
}
// HOTS: 1959AF0
int TByteStream::SetByteBuffer(LPBYTE pbNewByteData, DWORD cbNewByteData)
{
if(pbNewByteData != NULL || cbNewByteData == 0)
{
pbByteData = pbNewByteData;
cbByteData = cbNewByteData;
return ERROR_SUCCESS;
}
return ERROR_INVALID_PARAMETER;
}
// HOTS: 1957160
int TByteStream::GetValue_DWORD(DWORD & Value)
{
ARRAY_POINTER Pointer;
int nError;
nError = GetBytes(sizeof(DWORD), &Pointer);
if(nError != ERROR_SUCCESS)
return nError;
Value = Pointer.Uint32s[0];
return ERROR_SUCCESS;
}
int TByteStream::GetValue_ItemCount(DWORD & NumberOfBytes, DWORD & ItemCount, DWORD ItemSize)
{
ARRAY_POINTER Pointer;
ULONGLONG ByteCount;
int nError;
// Verify if there is at least - 8 bytes
nError = GetBytes(sizeof(ULONGLONG), &Pointer);
if(nError != ERROR_SUCCESS)
return nError;
// Extract the number of bytes
ByteCount = Pointer.Int64Ptr[0];
if(ByteCount > 0xFFFFFFFF || (ByteCount % ItemSize) != 0)
return ERROR_BAD_FORMAT;
// Give the result to the caller
NumberOfBytes = (DWORD)ByteCount;
ItemCount = (DWORD)(ByteCount / ItemSize);
return ERROR_SUCCESS;
}
//-----------------------------------------------------------------------------
// TGenericArray functions
TGenericArray::TGenericArray()
{
DataBuffer.Bytes = NULL;
FirstValid.Bytes = NULL;
ArrayPointer.Bytes = NULL;
ItemCount = 0;
MaxItemCount = 0;
bIsValidArray = false;
}
TGenericArray::~TGenericArray()
{
if(DataBuffer.Bytes != NULL)
CASC_FREE(DataBuffer.Bytes);
}
// HOTS: inlined
void TGenericArray::ExchangeWith(TGenericArray & Target)
{
TGenericArray WorkBuff;
WorkBuff = *this;
*this = Target;
Target = WorkBuff;
}
// HOTS: Inlined
void TGenericArray::CopyFrom(TGenericArray & Source)
{
if(DataBuffer.Bytes != NULL)
CASC_FREE(DataBuffer.Bytes);
*this = Source;
}
// HOTS: 1957090 (SetDwordsValid)
// HOTS: 19570B0 (SetTripletsValid)
// HOTS: 19570D0 (? SetBitsValid ?)
// HOTS: 19570F0 (SetNameFragmentsValid)
int TGenericArray::SetArrayValid()
{
if(bIsValidArray != 0)
return 1;
bIsValidArray = true;
return ERROR_SUCCESS;
}
// HOTS: 19575A0
void TGenericArray::SetMaxItems_CHARS(DWORD NewMaxItemCount)
{
ARRAY_POINTER OldDataBuffer = DataBuffer;
ARRAY_POINTER NewDataBuffer;
// Allocate new data buffer
NewDataBuffer.Chars = CASC_ALLOC(char, NewMaxItemCount);
if(NewDataBuffer.Chars != NULL)
{
// Copy the old items to the buffer
for(DWORD i = 0; i < ItemCount; i++)
{
NewDataBuffer.Chars[i] = FirstValid.Chars[i];
}
}
DataBuffer = NewDataBuffer;
FirstValid = NewDataBuffer;
ArrayPointer = NewDataBuffer;
MaxItemCount = NewMaxItemCount;
CASC_FREE(OldDataBuffer.Chars);
}
// HOTS: 1957600
void TGenericArray::SetMaxItems_PATH_STOP(DWORD NewMaxItemCount)
{
ARRAY_POINTER OldDataBuffer = DataBuffer;
ARRAY_POINTER NewDataBuffer;
// Allocate new data buffer
NewDataBuffer.PathStopPtr = CASC_ALLOC(PATH_STOP, NewMaxItemCount);
if(NewDataBuffer.PathStopPtr != NULL)
{
// Copy the old items to the buffer
for(DWORD i = 0; i < ItemCount; i++)
{
NewDataBuffer.PathStopPtr[i] = FirstValid.PathStopPtr[i];
}
}
DataBuffer = NewDataBuffer;
FirstValid = NewDataBuffer;
ArrayPointer = NewDataBuffer;
MaxItemCount = NewMaxItemCount;
CASC_FREE(OldDataBuffer.PathStopPtr);
}
// HOTS: inline
void TGenericArray::InsertOneItem_CHAR(char NewItem)
{
DWORD NewMaxItemCount;
DWORD NewItemCount;
NewItemCount = ItemCount + 1;
if(NewItemCount > MaxItemCount)
{
NewMaxItemCount = NewItemCount;
if(MaxItemCount > (NewItemCount / 2))
{
if(MaxItemCount <= (CASC_MAX_ENTRIES(BYTE) / 2))
NewMaxItemCount = MaxItemCount + MaxItemCount;
else
NewMaxItemCount = CASC_MAX_ENTRIES(BYTE);
}
SetMaxItems_CHARS(NewMaxItemCount);
}
// Put the character to the slot that has been reserved
FirstValid.Chars[ItemCount++] = NewItem;
}
// HOTS: 1958330, inline
void TGenericArray::InsertOneItem_PATH_STOP(PATH_STOP & NewItem)
{
DWORD NewMaxItemCount;
DWORD NewItemCount;
NewItemCount = ItemCount + 1;
if(NewItemCount > MaxItemCount)
{
NewMaxItemCount = NewItemCount;
if(MaxItemCount > (NewItemCount / 2))
{
if(MaxItemCount <= (CASC_MAX_ENTRIES(PATH_STOP) / 2))
NewMaxItemCount = MaxItemCount + MaxItemCount;
else
NewMaxItemCount = CASC_MAX_ENTRIES(PATH_STOP);
}
SetMaxItems_PATH_STOP(NewMaxItemCount);
}
// Put the structure to the slot that has been reserved
FirstValid.PathStopPtr[ItemCount++] = NewItem;
}
// HOTS: 19583A0
void TGenericArray::sub_19583A0(DWORD NewItemCount)
{
DWORD OldMaxItemCount = MaxItemCount;
if(NewItemCount > MaxItemCount)
{
DWORD NewMaxItemCount = NewItemCount;
if(MaxItemCount > (NewItemCount / 2))
{
if(MaxItemCount <= (CASC_MAX_ENTRIES(PATH_STOP) / 2))
NewMaxItemCount = MaxItemCount + MaxItemCount;
else
NewMaxItemCount = CASC_MAX_ENTRIES(PATH_STOP);
}
SetMaxItems_PATH_STOP(NewMaxItemCount);
}
// Initialize the newly inserted items
for(DWORD i = OldMaxItemCount; i < NewItemCount; i++)
{
FirstValid.PathStopPtr[i].ItemIndex = 0;
FirstValid.PathStopPtr[i].field_4 = 0;
FirstValid.PathStopPtr[i].field_8 = 0;
FirstValid.PathStopPtr[i].field_C = 0xFFFFFFFF;
FirstValid.PathStopPtr[i].field_10 = 0xFFFFFFFF;
}
ItemCount = NewItemCount;
}
// HOTS: 1957440
int TGenericArray::LoadDwordsArray(TByteStream & InStream)
{
DWORD NumberOfBytes;
int nError;
// Get and verify the number of items
nError = InStream.GetValue_ItemCount(NumberOfBytes, ItemCount, sizeof(DWORD));
if(nError != ERROR_SUCCESS)
return nError;
nError = InStream.GetArray_DWORDs(&ArrayPointer, ItemCount);
if(nError != ERROR_SUCCESS)
return nError;
nError = InStream.SkipBytes((0 - (DWORD)NumberOfBytes) & 0x07);
if(nError != ERROR_SUCCESS)
return nError;
return SetArrayValid();
}
// HOTS: 19574E0
int TGenericArray::LoadTripletsArray(TByteStream & InStream)
{
DWORD NumberOfBytes;
int nError;
// Get and verify the number of items
nError = InStream.GetValue_ItemCount(NumberOfBytes, ItemCount, sizeof(TRIPLET));
if(nError != ERROR_SUCCESS)
return nError;
nError = InStream.GetArray_Triplets(&ArrayPointer, ItemCount);
if(nError != ERROR_SUCCESS)
return nError;
nError = InStream.SkipBytes((0 - (DWORD)NumberOfBytes) & 0x07);
if(nError != ERROR_SUCCESS)
return nError;
return SetArrayValid();
}
// HOTS: 1957690
int TGenericArray::LoadByteArray(TByteStream & InStream)
{
DWORD NumberOfBytes;
int nError;
// Get and verify the number of items
nError = InStream.GetValue_ItemCount(NumberOfBytes, ItemCount, sizeof(BYTE));
if(nError != ERROR_SUCCESS)
return nError;
nError = InStream.GetArray_BYTES(&ArrayPointer, ItemCount);
if(nError != ERROR_SUCCESS)
return nError;
nError = InStream.SkipBytes((0 - (DWORD)NumberOfBytes) & 0x07);
if(nError != ERROR_SUCCESS)
return nError;
return SetArrayValid();
}
// HOTS: 1957700
int TGenericArray::LoadFragmentInfos(TByteStream & InStream)
{
DWORD NumberOfBytes;
int nError;
// Get and verify the number of items
nError = InStream.GetValue_ItemCount(NumberOfBytes, ItemCount, sizeof(NAME_FRAG));
if(nError != ERROR_SUCCESS)
return nError;
nError = InStream.GetArray_NameTable(&ArrayPointer, ItemCount);
if(nError != ERROR_SUCCESS)
return nError;
nError = InStream.SkipBytes((0 - (DWORD)NumberOfBytes) & 0x07);
if(nError != ERROR_SUCCESS)
return nError;
return SetArrayValid();
}
// HOTS: 195A220
int TGenericArray::LoadStrings(TByteStream & InStream)
{
DWORD NumberOfBytes;
int nError;
// Get and verify the number of items
nError = InStream.GetValue_ItemCount(NumberOfBytes, ItemCount, sizeof(char));
if(nError != ERROR_SUCCESS)
return nError;
nError = InStream.GetArray_BYTES(&ArrayPointer, ItemCount);
if(nError != ERROR_SUCCESS)
return nError;
nError = InStream.SkipBytes((0 - (DWORD)NumberOfBytes) & 0x07);
if(nError != ERROR_SUCCESS)
return nError;
return SetArrayValid();
}
// HOTS: 19581C0
int TGenericArray::LoadDwordsArray_Copy(TByteStream & InStream)
{
TGenericArray TempArray;
int nError;
nError = TempArray.LoadDwordsArray(InStream);
if(nError != ERROR_SUCCESS)
return nError;
CopyFrom(TempArray);
return ERROR_SUCCESS;
}
// HOTS: 1958250
int TGenericArray::LoadTripletsArray_Copy(TByteStream & InStream)
{
TGenericArray TempArray;
int nError;
nError = TempArray.LoadTripletsArray(InStream);
if(nError != ERROR_SUCCESS)
return nError;
CopyFrom(TempArray);
return ERROR_SUCCESS;
}
// HOTS: 1958420
int TGenericArray::LoadBytes_Copy(TByteStream & InStream)
{
TGenericArray TempArray;
int nError;
nError = TempArray.LoadByteArray(InStream);
if(nError != ERROR_SUCCESS)
return nError;
CopyFrom(TempArray);
return 0;
}
// HOTS: 19584F0
int TGenericArray::LoadFragmentInfos_Copy(TByteStream & InStream)
{
TGenericArray TempArray;
int nError;
nError = TempArray.LoadFragmentInfos(InStream);
if(nError != ERROR_SUCCESS)
return nError;
CopyFrom(TempArray);
return ERROR_SUCCESS;
}
// HOTS: 195A360
int TGenericArray::LoadStringsWithCopy(TByteStream & InStream)
{
TGenericArray TempArray;
int nError;
nError = TempArray.LoadStrings(InStream);
if(nError != ERROR_SUCCESS)
return nError;
CopyFrom(TempArray);
return ERROR_SUCCESS;
}
//-----------------------------------------------------------------------------
// TBitEntryArray functions
TBitEntryArray::TBitEntryArray()
{
BitsPerEntry = 0;
EntryBitMask = 0;
TotalEntries = 0;
}
TBitEntryArray::~TBitEntryArray()
{}
// HOTS: 01957D20
void TBitEntryArray::ExchangeWith(TBitEntryArray & Target)
{
TBitEntryArray WorkBuff;
WorkBuff = *this;
*this = Target;
Target = WorkBuff;
}
// HOTS: 1958580
int TBitEntryArray::LoadFromStream(TByteStream & InStream)
{
ARRAY_POINTER Pointer;
ULONGLONG Value = 0;
int nError;
nError = LoadDwordsArray_Copy(InStream);
if(nError != ERROR_SUCCESS)
return nError;
nError = InStream.GetBytes(sizeof(DWORD), &Pointer);
if(nError != ERROR_SUCCESS)
return nError;
BitsPerEntry = Pointer.Uint32s[0];
if(BitsPerEntry > 0x20)
return ERROR_BAD_FORMAT;
nError = InStream.GetBytes(sizeof(DWORD), &Pointer);
if(nError != ERROR_SUCCESS)
return nError;
EntryBitMask = Pointer.Uint32s[0];
nError = InStream.GetBytes(sizeof(ULONGLONG), &Pointer);
if(nError == ERROR_SUCCESS)
Value = Pointer.Int64Ptr[0];
if(Value > 0xFFFFFFFF)
return ERROR_BAD_FORMAT;
TotalEntries = (DWORD)Value;
assert((BitsPerEntry * TotalEntries) / 32 <= ItemCount);
return ERROR_SUCCESS;
}
// HOTS: 1959300
int TBitEntryArray::LoadFromStream_Exchange(TByteStream & InStream)
{
TBitEntryArray TempArray;
int nError;
nError = TempArray.LoadFromStream(InStream);
if(nError != ERROR_SUCCESS)
return nError;
ExchangeWith(TempArray);
return ERROR_SUCCESS;
}
//-----------------------------------------------------------------------------
// TStruct40 functions
TStruct40::TStruct40()
{
ItemIndex = 0;
CharIndex = 0;
ItemCount = 0;
SearchPhase = CASC_SEARCH_INITIALIZING;
}
// HOTS: 19586B0
void TStruct40::InitSearchBuffers()
{
DWORD NewMaxItemCount;
array_00.ItemCount = 0;
// HOTS: 19586BD
if(array_00.MaxItemCount < 0x40)
{
// HOTS: 19586C2
NewMaxItemCount = 0x40;
if(array_00.MaxItemCount > 0x20)
{
if(array_00.MaxItemCount <= 0x7FFFFFFF)
NewMaxItemCount = array_00.MaxItemCount + array_00.MaxItemCount;
else
NewMaxItemCount = CASC_MAX_ENTRIES(BYTE);
}
array_00.SetMaxItems_CHARS(NewMaxItemCount);
}
// HOTS: 19586E1
// Set the new item count
PathStops.sub_19583A0(0);
if(PathStops.MaxItemCount < 4)
{
// HOTS: 19586F2
NewMaxItemCount = 4;
// HOTS: 19586EA
if(PathStops.MaxItemCount > 2)
{
if(PathStops.MaxItemCount <= 0x6666666)
NewMaxItemCount = PathStops.MaxItemCount + PathStops.MaxItemCount;
else
NewMaxItemCount = CASC_MAX_ENTRIES(PATH_STOP);
}
// HOTS: 195870B
PathStops.SetMaxItems_PATH_STOP(NewMaxItemCount);
}
ItemIndex = 0;
CharIndex = 0;
ItemCount = 0;
SearchPhase = CASC_SEARCH_SEARCHING;
}
//-----------------------------------------------------------------------------
// TSparseArray functions
TSparseArray::TSparseArray()
{
TotalItemCount = 0;
ValidItemCount = 0;
}
// HOTS: 1957DA0
void TSparseArray::ExchangeWith(TSparseArray & Target)
{
TSparseArray WorkBuff;
WorkBuff = *this;
*this = Target;
Target = WorkBuff;
}
// HOTS: 1958630
int TSparseArray::LoadFromStream(TByteStream & InStream)
{
ARRAY_POINTER Pointer;
int nError;
nError = ItemBits.LoadDwordsArray_Copy(InStream);
if(nError != ERROR_SUCCESS)
return nError;
nError = InStream.GetBytes(sizeof(DWORD), &Pointer);
if(nError != ERROR_SUCCESS)
return nError;
TotalItemCount = Pointer.Uint32s[0];
nError = InStream.GetBytes(sizeof(DWORD), &Pointer);
if(nError != ERROR_SUCCESS)
return nError;
ValidItemCount = Pointer.Uint32s[0];
if(ValidItemCount > TotalItemCount)
return ERROR_FILE_CORRUPT;
nError = BaseValues.LoadTripletsArray_Copy(InStream);
if(nError != ERROR_SUCCESS)
return nError;
nError = ArrayDwords_38.LoadDwordsArray_Copy(InStream);
if(nError != ERROR_SUCCESS)
return nError;
nError = ArrayDwords_50.LoadDwordsArray_Copy(InStream);
if(nError != ERROR_SUCCESS)
return nError;
return ERROR_SUCCESS;
}
// HOTS: 1959380
int TSparseArray::LoadFromStream_Exchange(TByteStream & InStream)
{
TSparseArray NewStruct68;
int nError;
nError = NewStruct68.LoadFromStream(InStream);
if(nError != ERROR_SUCCESS)
return nError;
ExchangeWith(NewStruct68);
return ERROR_SUCCESS;
}
// HOTS: 1959B60
DWORD TSparseArray::GetItemValue(DWORD ItemIndex)
{
PTRIPLET pTriplet;
DWORD DwordIndex;
DWORD BaseValue;
DWORD BitMask;
//
// Divide the low-8-bits index to four parts:
//
// |-----------------------|---|------------|
// | A (23 bits) | B | C |
// |-----------------------|---|------------|
//
// A (23-bits): Index to the table (60 bits per entry)
//
// Layout of the table entry:
// |--------------------------------|-------|--------|--------|---------|---------|---------|---------|-----|
// | Base Value | val[0]| val[1] | val[2] | val[3] | val[4] | val[5] | val[6] | - |
// | 32 bits | 7 bits| 8 bits | 8 bits | 9 bits | 9 bits | 9 bits | 9 bits |5bits|
// |--------------------------------|-------|--------|--------|---------|---------|---------|---------|-----|
//
// B (3 bits) : Index of the variable-bit value in the array (val[#], see above)