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pupy/client/sources/MemoryModule.c

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/*
* Memory DLL loading code
* Version 0.0.4
*
* Copyright (c) 2004-2015 by Joachim Bauch / mail@joachim-bauch.de
* http://www.joachim-bauch.de
*
* The contents of this file are subject to the Mozilla Public License Version
* 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is MemoryModule.c
*
* The Initial Developer of the Original Code is Joachim Bauch.
*
* Portions created by Joachim Bauch are Copyright (C) 2004-2015
* Joachim Bauch. All Rights Reserved.
*
*/
#include <windows.h>
#include <winnt.h>
#include <stddef.h>
#include <tchar.h>
#ifdef DEBUG_OUTPUT
#include <stdio.h>
#endif
#ifndef IMAGE_SIZEOF_BASE_RELOCATION
// Vista SDKs no longer define IMAGE_SIZEOF_BASE_RELOCATION!?
#define IMAGE_SIZEOF_BASE_RELOCATION (sizeof(IMAGE_BASE_RELOCATION))
#endif
#include "MemoryModule.h"
typedef BOOL (WINAPI *DllEntryProc)(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpReserved);
typedef int (WINAPI *ExeEntryProc)(void);
typedef struct {
PIMAGE_NT_HEADERS headers;
unsigned char *codeBase;
HCUSTOMMODULE *modules;
int numModules;
BOOL initialized;
BOOL isDLL;
BOOL isRelocated;
CustomLoadLibraryFunc loadLibrary;
CustomGetProcAddressFunc getProcAddress;
CustomFreeLibraryFunc freeLibrary;
void *userdata;
ExeEntryProc exeEntry;
DWORD pageSize;
} MEMORYMODULE, *PMEMORYMODULE;
typedef struct {
LPVOID address;
LPVOID alignedAddress;
DWORD size;
DWORD characteristics;
BOOL last;
} SECTIONFINALIZEDATA, *PSECTIONFINALIZEDATA;
#define GET_HEADER_DICTIONARY(module, idx) &(module)->headers->OptionalHeader.DataDirectory[idx]
#define ALIGN_DOWN(address, alignment) (LPVOID)((uintptr_t)(address) & ~((alignment) - 1))
#ifdef DEBUG_OUTPUT
static void
OutputLastError(const char *msg)
{
LPVOID tmp;
char *tmpmsg;
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&tmp, 0, NULL);
tmpmsg = (char *)LocalAlloc(LPTR, strlen(msg) + strlen(tmp) + 3);
sprintf(tmpmsg, "%s: %s", msg, tmp);
OutputDebugString(tmpmsg);
LocalFree(tmpmsg);
LocalFree(tmp);
}
#endif
static BOOL
CopySections(const unsigned char *data, PIMAGE_NT_HEADERS old_headers, PMEMORYMODULE module)
{
int i, size;
unsigned char *codeBase = module->codeBase;
unsigned char *dest;
PIMAGE_SECTION_HEADER section = IMAGE_FIRST_SECTION(module->headers);
for (i=0; i<module->headers->FileHeader.NumberOfSections; i++, section++) {
if (section->SizeOfRawData == 0) {
// section doesn't contain data in the dll itself, but may define
// uninitialized data
size = old_headers->OptionalHeader.SectionAlignment;
if (size > 0) {
dest = (unsigned char *)VirtualAlloc(codeBase + section->VirtualAddress,
size,
MEM_COMMIT,
PAGE_READWRITE);
if (dest == NULL) {
return FALSE;
}
// Always use position from file to support alignments smaller
// than page size.
dest = codeBase + section->VirtualAddress;
section->Misc.PhysicalAddress = (DWORD) (uintptr_t) dest;
memset(dest, 0, size);
}
// section is empty
continue;
}
// commit memory block and copy data from dll
dest = (unsigned char *)VirtualAlloc(codeBase + section->VirtualAddress,
section->SizeOfRawData,
MEM_COMMIT,
PAGE_READWRITE);
if (dest == NULL) {
return FALSE;
}
// Always use position from file to support alignments smaller
// than page size.
dest = codeBase + section->VirtualAddress;
memcpy(dest, data + section->PointerToRawData, section->SizeOfRawData);
section->Misc.PhysicalAddress = (DWORD) (uintptr_t) dest;
}
return TRUE;
}
// Protection flags for memory pages (Executable, Readable, Writeable)
static int ProtectionFlags[2][2][2] = {
{
// not executable
{PAGE_NOACCESS, PAGE_WRITECOPY},
{PAGE_READONLY, PAGE_READWRITE},
}, {
// executable
{PAGE_EXECUTE, PAGE_EXECUTE_WRITECOPY},
{PAGE_EXECUTE_READ, PAGE_EXECUTE_READWRITE},
},
};
static DWORD
GetRealSectionSize(PMEMORYMODULE module, PIMAGE_SECTION_HEADER section) {
DWORD size = section->SizeOfRawData;
if (size == 0) {
if (section->Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA) {
size = module->headers->OptionalHeader.SizeOfInitializedData;
} else if (section->Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) {
size = module->headers->OptionalHeader.SizeOfUninitializedData;
}
}
return size;
}
static BOOL
FinalizeSection(PMEMORYMODULE module, PSECTIONFINALIZEDATA sectionData) {
DWORD protect, oldProtect;
BOOL executable;
BOOL readable;
BOOL writeable;
if (sectionData->size == 0) {
return TRUE;
}
if (sectionData->characteristics & IMAGE_SCN_MEM_DISCARDABLE) {
// section is not needed any more and can safely be freed
if (sectionData->address == sectionData->alignedAddress &&
(sectionData->last ||
module->headers->OptionalHeader.SectionAlignment == module->pageSize ||
(sectionData->size % module->pageSize) == 0)
) {
// Only allowed to decommit whole pages
VirtualFree(sectionData->address, sectionData->size, MEM_DECOMMIT);
}
return TRUE;
}
// determine protection flags based on characteristics
executable = (sectionData->characteristics & IMAGE_SCN_MEM_EXECUTE) != 0;
readable = (sectionData->characteristics & IMAGE_SCN_MEM_READ) != 0;
writeable = (sectionData->characteristics & IMAGE_SCN_MEM_WRITE) != 0;
protect = ProtectionFlags[executable][readable][writeable];
if (sectionData->characteristics & IMAGE_SCN_MEM_NOT_CACHED) {
protect |= PAGE_NOCACHE;
}
// change memory access flags
if (VirtualProtect(sectionData->address, sectionData->size, protect, &oldProtect) == 0) {
#ifdef DEBUG_OUTPUT
OutputLastError("Error protecting memory page");
#endif
return FALSE;
}
return TRUE;
}
static BOOL
FinalizeSections(PMEMORYMODULE module)
{
int i;
PIMAGE_SECTION_HEADER section = IMAGE_FIRST_SECTION(module->headers);
#ifdef _WIN64
uintptr_t imageOffset = (module->headers->OptionalHeader.ImageBase & 0xffffffff00000000);
#else
#define imageOffset 0
#endif
SECTIONFINALIZEDATA sectionData;
sectionData.address = (LPVOID)((uintptr_t)section->Misc.PhysicalAddress | imageOffset);
sectionData.alignedAddress = ALIGN_DOWN(sectionData.address, module->pageSize);
sectionData.size = GetRealSectionSize(module, section);
sectionData.characteristics = section->Characteristics;
sectionData.last = FALSE;
section++;
// loop through all sections and change access flags
for (i=1; i<module->headers->FileHeader.NumberOfSections; i++, section++) {
LPVOID sectionAddress = (LPVOID)((uintptr_t)section->Misc.PhysicalAddress | imageOffset);
LPVOID alignedAddress = ALIGN_DOWN(sectionAddress, module->pageSize);
DWORD sectionSize = GetRealSectionSize(module, section);
// Combine access flags of all sections that share a page
// TODO(fancycode): We currently share flags of a trailing large section
// with the page of a first small section. This should be optimized.
if (sectionData.alignedAddress == alignedAddress || (uintptr_t) sectionData.address + sectionData.size > (uintptr_t) alignedAddress) {
// Section shares page with previous
if ((section->Characteristics & IMAGE_SCN_MEM_DISCARDABLE) == 0 || (sectionData.characteristics & IMAGE_SCN_MEM_DISCARDABLE) == 0) {
sectionData.characteristics = (sectionData.characteristics | section->Characteristics) & ~IMAGE_SCN_MEM_DISCARDABLE;
} else {
sectionData.characteristics |= section->Characteristics;
}
sectionData.size = (((uintptr_t)sectionAddress) + sectionSize) - (uintptr_t) sectionData.address;
continue;
}
if (!FinalizeSection(module, &sectionData)) {
return FALSE;
}
sectionData.address = sectionAddress;
sectionData.alignedAddress = alignedAddress;
sectionData.size = sectionSize;
sectionData.characteristics = section->Characteristics;
}
sectionData.last = TRUE;
if (!FinalizeSection(module, &sectionData)) {
return FALSE;
}
#ifndef _WIN64
#undef imageOffset
#endif
return TRUE;
}
static BOOL
ExecuteTLS(PMEMORYMODULE module)
{
unsigned char *codeBase = module->codeBase;
PIMAGE_TLS_DIRECTORY tls;
PIMAGE_TLS_CALLBACK* callback;
PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY(module, IMAGE_DIRECTORY_ENTRY_TLS);
if (directory->VirtualAddress == 0) {
return TRUE;
}
tls = (PIMAGE_TLS_DIRECTORY) (codeBase + directory->VirtualAddress);
callback = (PIMAGE_TLS_CALLBACK *) tls->AddressOfCallBacks;
if (callback) {
while (*callback) {
(*callback)((LPVOID) codeBase, DLL_PROCESS_ATTACH, NULL);
callback++;
}
}
return TRUE;
}
static BOOL
PerformBaseRelocation(PMEMORYMODULE module, SIZE_T delta)
{
unsigned char *codeBase = module->codeBase;
PIMAGE_BASE_RELOCATION relocation;
PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY(module, IMAGE_DIRECTORY_ENTRY_BASERELOC);
if (directory->Size == 0) {
return (delta == 0);
}
relocation = (PIMAGE_BASE_RELOCATION) (codeBase + directory->VirtualAddress);
for (; relocation->VirtualAddress > 0; ) {
DWORD i;
unsigned char *dest = codeBase + relocation->VirtualAddress;
unsigned short *relInfo = (unsigned short *)((unsigned char *)relocation + IMAGE_SIZEOF_BASE_RELOCATION);
for (i=0; i<((relocation->SizeOfBlock-IMAGE_SIZEOF_BASE_RELOCATION) / 2); i++, relInfo++) {
DWORD *patchAddrHL;
#ifdef _WIN64
ULONGLONG *patchAddr64;
#endif
int type, offset;
// the upper 4 bits define the type of relocation
type = *relInfo >> 12;
// the lower 12 bits define the offset
offset = *relInfo & 0xfff;
switch (type)
{
case IMAGE_REL_BASED_ABSOLUTE:
// skip relocation
break;
case IMAGE_REL_BASED_HIGHLOW:
// change complete 32 bit address
patchAddrHL = (DWORD *) (dest + offset);
*patchAddrHL += (DWORD) delta;
break;
#ifdef _WIN64
case IMAGE_REL_BASED_DIR64:
patchAddr64 = (ULONGLONG *) (dest + offset);
*patchAddr64 += (ULONGLONG) delta;
break;
#endif
default:
//printf("Unknown relocation: %d\n", type);
break;
}
}
// advance to next relocation block
relocation = (PIMAGE_BASE_RELOCATION) (((char *) relocation) + relocation->SizeOfBlock);
}
return TRUE;
}
static BOOL
BuildImportTable(PMEMORYMODULE module)
{
unsigned char *codeBase = module->codeBase;
PIMAGE_IMPORT_DESCRIPTOR importDesc;
BOOL result = TRUE;
PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY(module, IMAGE_DIRECTORY_ENTRY_IMPORT);
if (directory->Size == 0) {
return TRUE;
}
importDesc = (PIMAGE_IMPORT_DESCRIPTOR) (codeBase + directory->VirtualAddress);
for (; !IsBadReadPtr(importDesc, sizeof(IMAGE_IMPORT_DESCRIPTOR)) && importDesc->Name; importDesc++) {
uintptr_t *thunkRef;
FARPROC *funcRef;
HCUSTOMMODULE *tmp;
HCUSTOMMODULE handle = module->loadLibrary((LPCSTR) (codeBase + importDesc->Name), module->userdata);
if (handle == NULL) {
SetLastError(ERROR_MOD_NOT_FOUND);
result = FALSE;
break;
}
tmp = (HCUSTOMMODULE *) realloc(module->modules, (module->numModules+1)*(sizeof(HCUSTOMMODULE)));
if (tmp == NULL) {
module->freeLibrary(handle, module->userdata);
SetLastError(ERROR_OUTOFMEMORY);
result = FALSE;
break;
}
module->modules = tmp;
module->modules[module->numModules++] = handle;
if (importDesc->OriginalFirstThunk) {
thunkRef = (uintptr_t *) (codeBase + importDesc->OriginalFirstThunk);
funcRef = (FARPROC *) (codeBase + importDesc->FirstThunk);
} else {
// no hint table
thunkRef = (uintptr_t *) (codeBase + importDesc->FirstThunk);
funcRef = (FARPROC *) (codeBase + importDesc->FirstThunk);
}
for (; *thunkRef; thunkRef++, funcRef++) {
if (IMAGE_SNAP_BY_ORDINAL(*thunkRef)) {
*funcRef = module->getProcAddress(handle, (LPCSTR)IMAGE_ORDINAL(*thunkRef), module->userdata);
} else {
PIMAGE_IMPORT_BY_NAME thunkData = (PIMAGE_IMPORT_BY_NAME) (codeBase + (*thunkRef));
*funcRef = module->getProcAddress(handle, (LPCSTR)&thunkData->Name, module->userdata);
}
if (*funcRef == 0) {
result = FALSE;
break;
}
}
if (!result) {
module->freeLibrary(handle, module->userdata);
SetLastError(ERROR_PROC_NOT_FOUND);
break;
}
}
return result;
}
static HCUSTOMMODULE _LoadLibrary(LPCSTR filename, void *userdata)
{
HMODULE result = LoadLibraryA(filename);
if (result == NULL) {
return NULL;
}
return (HCUSTOMMODULE) result;
}
static FARPROC _GetProcAddress(HCUSTOMMODULE module, LPCSTR name, void *userdata)
{
return (FARPROC) GetProcAddress((HMODULE) module, name);
}
static void _FreeLibrary(HCUSTOMMODULE module, void *userdata)
{
FreeLibrary((HMODULE) module);
}
HMEMORYMODULE MemoryLoadLibrary(const void *data)
{
return MemoryLoadLibraryEx(data, _LoadLibrary, _GetProcAddress, _FreeLibrary, NULL);
}
HMEMORYMODULE MemoryLoadLibraryEx(const void *data,
CustomLoadLibraryFunc loadLibrary,
CustomGetProcAddressFunc getProcAddress,
CustomFreeLibraryFunc freeLibrary,
void *userdata)
{
PMEMORYMODULE result;
PIMAGE_DOS_HEADER dos_header;
PIMAGE_NT_HEADERS old_header;
unsigned char *code, *headers;
SIZE_T locationDelta;
SYSTEM_INFO sysInfo;
HMODULE hModule;
dos_header = (PIMAGE_DOS_HEADER)data;
if (dos_header->e_magic != IMAGE_DOS_SIGNATURE) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
old_header = (PIMAGE_NT_HEADERS)&((const unsigned char *)(data))[dos_header->e_lfanew];
if (old_header->Signature != IMAGE_NT_SIGNATURE) {
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
#ifdef _WIN64
if (old_header->FileHeader.Machine != IMAGE_FILE_MACHINE_AMD64) {
#else
if (old_header->FileHeader.Machine != IMAGE_FILE_MACHINE_I386) {
#endif
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
if (old_header->OptionalHeader.SectionAlignment & 1) {
// Only support section alignments that are a multiple of 2
SetLastError(ERROR_BAD_EXE_FORMAT);
return NULL;
}
// reserve memory for image of library
// XXX: is it correct to commit the complete memory region at once?
// calling DllEntry raises an exception if we don't...
code = (unsigned char *)VirtualAlloc((LPVOID)(old_header->OptionalHeader.ImageBase),
old_header->OptionalHeader.SizeOfImage,
MEM_RESERVE | MEM_COMMIT,
PAGE_READWRITE);
if (code == NULL) {
// try to allocate memory at arbitrary position
code = (unsigned char *)VirtualAlloc(NULL,
old_header->OptionalHeader.SizeOfImage,
MEM_RESERVE | MEM_COMMIT,
PAGE_READWRITE);
if (code == NULL) {
SetLastError(ERROR_OUTOFMEMORY);
return NULL;
}
}
result = (PMEMORYMODULE)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(MEMORYMODULE));
if (result == NULL) {
VirtualFree(code, 0, MEM_RELEASE);
SetLastError(ERROR_OUTOFMEMORY);
return NULL;
}
result->codeBase = code;
result->isDLL = (old_header->FileHeader.Characteristics & IMAGE_FILE_DLL) != 0;
result->loadLibrary = loadLibrary;
result->getProcAddress = getProcAddress;
result->freeLibrary = freeLibrary;
result->userdata = userdata;
hModule = LoadLibrary ("kernel32.dll");
if (hModule) {
int (WINAPI *GetNativeSystemInfo) (SYSTEM_INFO *systemInfo);
GetNativeSystemInfo = (void *) GetProcAddress (hModule, "GetNativeSystemInfo");
GetNativeSystemInfo(&sysInfo);
}
result->pageSize = sysInfo.dwPageSize;
// commit memory for headers
headers = (unsigned char *)VirtualAlloc(code,
old_header->OptionalHeader.SizeOfHeaders,
MEM_COMMIT,
PAGE_READWRITE);
// copy PE header to code
memcpy(headers, dos_header, old_header->OptionalHeader.SizeOfHeaders);
result->headers = (PIMAGE_NT_HEADERS)&((const unsigned char *)(headers))[dos_header->e_lfanew];
// update position
result->headers->OptionalHeader.ImageBase = (uintptr_t)code;
// copy sections from DLL file block to new memory location
if (!CopySections((const unsigned char *) data, old_header, result)) {
goto error;
}
// adjust base address of imported data
locationDelta = (SIZE_T)(code - old_header->OptionalHeader.ImageBase);
if (locationDelta != 0) {
result->isRelocated = PerformBaseRelocation(result, locationDelta);
} else {
result->isRelocated = TRUE;
}
// load required dlls and adjust function table of imports
if (!BuildImportTable(result)) {
goto error;
}
// mark memory pages depending on section headers and release
// sections that are marked as "discardable"
if (!FinalizeSections(result)) {
goto error;
}
// TLS callbacks are executed BEFORE the main loading
if (!ExecuteTLS(result)) {
goto error;
}
// get entry point of loaded library
if (result->headers->OptionalHeader.AddressOfEntryPoint != 0) {
if (result->isDLL) {
DllEntryProc DllEntry = (DllEntryProc) (code + result->headers->OptionalHeader.AddressOfEntryPoint);
// notify library about attaching to process
BOOL successfull = (*DllEntry)((HINSTANCE)code, DLL_PROCESS_ATTACH, 0);
if (!successfull) {
SetLastError(ERROR_DLL_INIT_FAILED);
goto error;
}
result->initialized = TRUE;
} else {
result->exeEntry = (ExeEntryProc) (code + result->headers->OptionalHeader.AddressOfEntryPoint);
}
} else {
result->exeEntry = NULL;
}
return (HMEMORYMODULE)result;
error:
// cleanup
MemoryFreeLibrary(result);
return NULL;
}
FARPROC MemoryGetProcAddress(HMEMORYMODULE module, LPCSTR name)
{
unsigned char *codeBase = ((PMEMORYMODULE)module)->codeBase;
DWORD idx;
PIMAGE_EXPORT_DIRECTORY exports;
PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY((PMEMORYMODULE)module, IMAGE_DIRECTORY_ENTRY_EXPORT);
if (directory->Size == 0) {
// no export table found
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
exports = (PIMAGE_EXPORT_DIRECTORY) (codeBase + directory->VirtualAddress);
if (exports->NumberOfNames == 0 || exports->NumberOfFunctions == 0) {
// DLL doesn't export anything
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
if (HIWORD(name) == 0) {
// load function by ordinal value
if (LOWORD(name) < exports->Base) {
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
idx = LOWORD(name) - exports->Base;
} else {
// search function name in list of exported names
DWORD i;
DWORD *nameRef = (DWORD *) (codeBase + exports->AddressOfNames);
WORD *ordinal = (WORD *) (codeBase + exports->AddressOfNameOrdinals);
BOOL found = FALSE;
for (i=0; i<exports->NumberOfNames; i++, nameRef++, ordinal++) {
if (_stricmp(name, (const char *) (codeBase + (*nameRef))) == 0) {
idx = *ordinal;
found = TRUE;
break;
}
}
if (!found) {
// exported symbol not found
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
}
if (idx > exports->NumberOfFunctions) {
// name <-> ordinal number don't match
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
// AddressOfFunctions contains the RVAs to the "real" functions
return (FARPROC) (codeBase + (*(DWORD *) (codeBase + exports->AddressOfFunctions + (idx*4))));
}
void MemoryFreeLibrary(HMEMORYMODULE mod)
{
PMEMORYMODULE module = (PMEMORYMODULE)mod;
if (module == NULL) {
return;
}
if (module->initialized) {
// notify library about detaching from process
DllEntryProc DllEntry = (DllEntryProc) (module->codeBase + module->headers->OptionalHeader.AddressOfEntryPoint);
(*DllEntry)((HINSTANCE)module->codeBase, DLL_PROCESS_DETACH, 0);
}
if (module->modules != NULL) {
// free previously opened libraries
int i;
for (i=0; i<module->numModules; i++) {
if (module->modules[i] != NULL) {
module->freeLibrary(module->modules[i], module->userdata);
}
}
free(module->modules);
}
if (module->codeBase != NULL) {
// release memory of library
VirtualFree(module->codeBase, 0, MEM_RELEASE);
}
HeapFree(GetProcessHeap(), 0, module);
}
int MemoryCallEntryPoint(HMEMORYMODULE mod)
{
PMEMORYMODULE module = (PMEMORYMODULE)mod;
if (module == NULL || module->isDLL || module->exeEntry == NULL || !module->isRelocated) {
return -1;
}
return module->exeEntry();
}
#define DEFAULT_LANGUAGE MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL)
HMEMORYRSRC MemoryFindResource(HMEMORYMODULE module, LPCTSTR name, LPCTSTR type)
{
return MemoryFindResourceEx(module, name, type, DEFAULT_LANGUAGE);
}
static PIMAGE_RESOURCE_DIRECTORY_ENTRY _MemorySearchResourceEntry(
void *root,
PIMAGE_RESOURCE_DIRECTORY resources,
LPCTSTR key)
{
PIMAGE_RESOURCE_DIRECTORY_ENTRY entries = (PIMAGE_RESOURCE_DIRECTORY_ENTRY) (resources + 1);
PIMAGE_RESOURCE_DIRECTORY_ENTRY result = NULL;
DWORD start;
DWORD end;
DWORD middle;
if (!IS_INTRESOURCE(key) && key[0] == TEXT('#')) {
// special case: resource id given as string
TCHAR *endpos = NULL;
long int tmpkey = (WORD) _tcstol((TCHAR *) &key[1], &endpos, 10);
if (tmpkey <= 0xffff && lstrlen(endpos) == 0) {
key = MAKEINTRESOURCE(tmpkey);
}
}
// entries are stored as ordered list of named entries,
// followed by an ordered list of id entries - we can do
// a binary search to find faster...
if (IS_INTRESOURCE(key)) {
WORD check = (WORD) (uintptr_t) key;
start = resources->NumberOfNamedEntries;
end = start + resources->NumberOfIdEntries;
while (end > start) {
WORD entryName;
middle = (start + end) >> 1;
entryName = (WORD) entries[middle].Name;
if (check < entryName) {
end = (end != middle ? middle : middle-1);
} else if (check > entryName) {
start = (start != middle ? middle : middle+1);
} else {
result = &entries[middle];
break;
}
}
} else {
LPCWSTR searchKey;
size_t searchKeyLen = _tcslen(key);
#if defined(UNICODE)
searchKey = key;
#else
// Resource names are always stored using 16bit characters, need to
// convert string we search for.
#define MAX_LOCAL_KEY_LENGTH 2048
// In most cases resource names are short, so optimize for that by
// using a pre-allocated array.
wchar_t _searchKeySpace[MAX_LOCAL_KEY_LENGTH+1];
LPWSTR _searchKey;
if (searchKeyLen > MAX_LOCAL_KEY_LENGTH) {
size_t _searchKeySize = (searchKeyLen + 1) * sizeof(wchar_t);
_searchKey = (LPWSTR) malloc(_searchKeySize);
if (_searchKey == NULL) {
SetLastError(ERROR_OUTOFMEMORY);
return NULL;
}
} else {
_searchKey = &_searchKeySpace[0];
}
mbstowcs(_searchKey, key, searchKeyLen);
_searchKey[searchKeyLen] = 0;
searchKey = _searchKey;
#endif
start = 0;
end = resources->NumberOfNamedEntries;
while (end > start) {
int cmp;
PIMAGE_RESOURCE_DIR_STRING_U resourceString;
middle = (start + end) >> 1;
resourceString = (PIMAGE_RESOURCE_DIR_STRING_U) (((char *) root) + (entries[middle].Name & 0x7FFFFFFF));
cmp = wcsnicmp(searchKey, resourceString->NameString, resourceString->Length);
if (cmp == 0) {
// Handle partial match
cmp = searchKeyLen - resourceString->Length;
}
if (cmp < 0) {
end = (middle != end ? middle : middle-1);
} else if (cmp > 0) {
start = (middle != start ? middle : middle+1);
} else {
result = &entries[middle];
break;
}
}
#if !defined(UNICODE)
if (searchKeyLen > MAX_LOCAL_KEY_LENGTH) {
free(_searchKey);
}
#undef MAX_LOCAL_KEY_LENGTH
#endif
}
return result;
}
HMEMORYRSRC MemoryFindResourceEx(HMEMORYMODULE module, LPCTSTR name, LPCTSTR type, WORD language)
{
unsigned char *codeBase = ((PMEMORYMODULE) module)->codeBase;
PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY((PMEMORYMODULE) module, IMAGE_DIRECTORY_ENTRY_RESOURCE);
PIMAGE_RESOURCE_DIRECTORY rootResources;
PIMAGE_RESOURCE_DIRECTORY nameResources;
PIMAGE_RESOURCE_DIRECTORY typeResources;
PIMAGE_RESOURCE_DIRECTORY_ENTRY foundType;
PIMAGE_RESOURCE_DIRECTORY_ENTRY foundName;
PIMAGE_RESOURCE_DIRECTORY_ENTRY foundLanguage;
if (directory->Size == 0) {
// no resource table found
SetLastError(ERROR_RESOURCE_DATA_NOT_FOUND);
return NULL;
}
if (language == DEFAULT_LANGUAGE) {
// use language from current thread
language = LANGIDFROMLCID(GetThreadLocale());
}
// resources are stored as three-level tree
// - first node is the type
// - second node is the name
// - third node is the language
rootResources = (PIMAGE_RESOURCE_DIRECTORY) (codeBase + directory->VirtualAddress);
foundType = _MemorySearchResourceEntry(rootResources, rootResources, type);
if (foundType == NULL) {
SetLastError(ERROR_RESOURCE_TYPE_NOT_FOUND);
return NULL;
}
typeResources = (PIMAGE_RESOURCE_DIRECTORY) (codeBase + directory->VirtualAddress + (foundType->OffsetToData & 0x7fffffff));
foundName = _MemorySearchResourceEntry(rootResources, typeResources, name);
if (foundName == NULL) {
SetLastError(ERROR_RESOURCE_NAME_NOT_FOUND);
return NULL;
}
nameResources = (PIMAGE_RESOURCE_DIRECTORY) (codeBase + directory->VirtualAddress + (foundName->OffsetToData & 0x7fffffff));
foundLanguage = _MemorySearchResourceEntry(rootResources, nameResources, (LPCTSTR) (uintptr_t) language);
if (foundLanguage == NULL) {
// requested language not found, use first available
if (nameResources->NumberOfIdEntries == 0) {
SetLastError(ERROR_RESOURCE_LANG_NOT_FOUND);
return NULL;
}
foundLanguage = (PIMAGE_RESOURCE_DIRECTORY_ENTRY) (nameResources + 1);
}
return (codeBase + directory->VirtualAddress + (foundLanguage->OffsetToData & 0x7fffffff));
}
DWORD MemorySizeofResource(HMEMORYMODULE module, HMEMORYRSRC resource)
{
PIMAGE_RESOURCE_DATA_ENTRY entry = (PIMAGE_RESOURCE_DATA_ENTRY) resource;
if (entry == NULL) {
return 0;
}
return entry->Size;
}
LPVOID MemoryLoadResource(HMEMORYMODULE module, HMEMORYRSRC resource)
{
unsigned char *codeBase = ((PMEMORYMODULE) module)->codeBase;
PIMAGE_RESOURCE_DATA_ENTRY entry = (PIMAGE_RESOURCE_DATA_ENTRY) resource;
if (entry == NULL) {
return NULL;
}
return codeBase + entry->OffsetToData;
}
int
MemoryLoadString(HMEMORYMODULE module, UINT id, LPTSTR buffer, int maxsize)
{
return MemoryLoadStringEx(module, id, buffer, maxsize, DEFAULT_LANGUAGE);
}
int
MemoryLoadStringEx(HMEMORYMODULE module, UINT id, LPTSTR buffer, int maxsize, WORD language)
{
HMEMORYRSRC resource;
PIMAGE_RESOURCE_DIR_STRING_U data;
DWORD size;
if (maxsize == 0) {
return 0;
}
resource = MemoryFindResourceEx(module, MAKEINTRESOURCE((id >> 4) + 1), RT_STRING, language);
if (resource == NULL) {
buffer[0] = 0;
return 0;
}
data = (PIMAGE_RESOURCE_DIR_STRING_U) MemoryLoadResource(module, resource);
id = id & 0x0f;
while (id--) {
data = (PIMAGE_RESOURCE_DIR_STRING_U) (((char *) data) + (data->Length + 1) * sizeof(WCHAR));
}
if (data->Length == 0) {
SetLastError(ERROR_RESOURCE_NAME_NOT_FOUND);
buffer[0] = 0;
return 0;
}
size = data->Length;
if (size >= (DWORD) maxsize) {
size = maxsize;
} else {
buffer[size] = 0;
}
#if defined(UNICODE)
wcsncpy(buffer, data->NameString, size);
#else
wcstombs(buffer, data->NameString, size);
#endif
return size;
}
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