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/*
* Memory DLL loading code
* Version 0.0.3
*
* Copyright (c) 2004-2013 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) 2004-2013
* Joachim Bauch. All Rights Reserved.
*
*
* THeller: Added binary search in MemoryGetProcAddress function
* (#define USE_BINARY_SEARCH to enable it). This gives a very large
* speedup for libraries that exports lots of functions.
*
* These portions are Copyright (C) 2013 Thomas Heller.
*/
#ifndef __GNUC__
// disable warnings about pointer <-> DWORD conversions
#pragma warning( disable : 4311 4312 )
#endif
#ifdef _WIN64
#define POINTER_TYPE ULONGLONG
#else
#define POINTER_TYPE DWORD
#endif
#include <windows.h>
#include <winnt.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"
#ifdef USE_BINARY_SEARCH
struct NAME_TABLE {
LPCSTR name;
WORD idx;
};
#endif
typedef struct {
PIMAGE_NT_HEADERS headers;
unsigned char *codeBase;
HCUSTOMMODULE *modules;
int numModules;
int initialized;
CustomLoadLibraryFunc loadLibrary;
CustomGetProcAddressFunc getProcAddress;
CustomFreeLibraryFunc freeLibrary;
#ifdef USE_BINARY_SEARCH
struct NAME_TABLE *name_table;
int numEntries;
#endif
void *userdata;
} MEMORYMODULE, *PMEMORYMODULE;
typedef BOOL (WINAPI *DllEntryProc)(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpReserved);
#define GET_HEADER_DICTIONARY(module, idx) &(module)->headers->OptionalHeader.DataDirectory[idx]
#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 void
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);
section->Misc.PhysicalAddress = (DWORD) (POINTER_TYPE) 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);
memcpy(dest, data + section->PointerToRawData, section->SizeOfRawData);
section->Misc.PhysicalAddress = (DWORD) (POINTER_TYPE) dest;
}
}
// 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 void
FinalizeSections(PMEMORYMODULE module)
{
int i;
PIMAGE_SECTION_HEADER section = IMAGE_FIRST_SECTION(module->headers);
#ifdef _WIN64
POINTER_TYPE imageOffset = (module->headers->OptionalHeader.ImageBase & 0xffffffff00000000);
#else
#define imageOffset 0
#endif
// loop through all sections and change access flags
for (i=0; i<module->headers->FileHeader.NumberOfSections; i++, section++) {
DWORD protect, oldProtect, size;
int executable = (section->Characteristics & IMAGE_SCN_MEM_EXECUTE) != 0;
int readable = (section->Characteristics & IMAGE_SCN_MEM_READ) != 0;
int writeable = (section->Characteristics & IMAGE_SCN_MEM_WRITE) != 0;
if (section->Characteristics & IMAGE_SCN_MEM_DISCARDABLE) {
// section is not needed any more and can safely be freed
VirtualFree((LPVOID)((POINTER_TYPE)section->Misc.PhysicalAddress | imageOffset), section->SizeOfRawData, MEM_DECOMMIT);
continue;
}
// determine protection flags based on characteristics
protect = ProtectionFlags[executable][readable][writeable];
if (section->Characteristics & IMAGE_SCN_MEM_NOT_CACHED) {
protect |= PAGE_NOCACHE;
}
// determine size of region
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;
}
}
if (size > 0) {
// change memory access flags
if (VirtualProtect((LPVOID)((POINTER_TYPE)section->Misc.PhysicalAddress | imageOffset), size, protect, &oldProtect) == 0)
#ifdef DEBUG_OUTPUT
OutputLastError("Error protecting memory page")
#endif
;
}
}
#ifndef _WIN64
#undef imageOffset
#endif
}
static void
PerformBaseRelocation(PMEMORYMODULE module, SIZE_T delta)
{
DWORD i;
unsigned char *codeBase = module->codeBase;
PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY(module, IMAGE_DIRECTORY_ENTRY_BASERELOC);
if (directory->Size > 0) {
PIMAGE_BASE_RELOCATION relocation = (PIMAGE_BASE_RELOCATION) (codeBase + directory->VirtualAddress);
for (; relocation->VirtualAddress > 0; ) {
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);
}
}
}
static int
BuildImportTable(PMEMORYMODULE module)
{
int result=1;
unsigned char *codeBase = module->codeBase;
HCUSTOMMODULE *tmp;
PIMAGE_DATA_DIRECTORY directory = GET_HEADER_DICTIONARY(module, IMAGE_DIRECTORY_ENTRY_IMPORT);
if (directory->Size > 0) {
PIMAGE_IMPORT_DESCRIPTOR importDesc = (PIMAGE_IMPORT_DESCRIPTOR) (codeBase + directory->VirtualAddress);
for (; !IsBadReadPtr(importDesc, sizeof(IMAGE_IMPORT_DESCRIPTOR)) && importDesc->Name; importDesc++) {
POINTER_TYPE *thunkRef;
FARPROC *funcRef;
HCUSTOMMODULE handle = module->loadLibrary((LPCSTR) (codeBase + importDesc->Name), module->userdata);
if (handle == NULL) {
SetLastError(ERROR_MOD_NOT_FOUND);
result = 0;
break;
}
tmp = (HCUSTOMMODULE *) realloc(module->modules, (module->numModules+1)*(sizeof(HCUSTOMMODULE)));
if (tmp == NULL) {
module->freeLibrary(handle, module->userdata);
SetLastError(ERROR_OUTOFMEMORY);
result = 0;
break;
}
module->modules = tmp;
module->modules[module->numModules++] = handle;
if (importDesc->OriginalFirstThunk) {
thunkRef = (POINTER_TYPE *) (codeBase + importDesc->OriginalFirstThunk);
funcRef = (FARPROC *) (codeBase + importDesc->FirstThunk);
} else {
// no hint table
thunkRef = (POINTER_TYPE *) (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 = 0;
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;
DllEntryProc DllEntry;
BOOL successfull;
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;
}
// 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(), 0, sizeof(MEMORYMODULE));
if (result == NULL) {
SetLastError(ERROR_OUTOFMEMORY);
VirtualFree(code, 0, MEM_RELEASE);
return NULL;
}
result->codeBase = code;
result->numModules = 0;
result->modules = NULL;
result->initialized = 0;
result->loadLibrary = loadLibrary;
result->getProcAddress = getProcAddress;
result->freeLibrary = freeLibrary;
result->userdata = userdata;
#ifdef USE_BINARY_SEARCH
result->name_table = NULL;
#endif
// 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, dos_header->e_lfanew + old_header->OptionalHeader.SizeOfHeaders);
result->headers = (PIMAGE_NT_HEADERS)&((const unsigned char *)(headers))[dos_header->e_lfanew];
// update position
result->headers->OptionalHeader.ImageBase = (POINTER_TYPE)code;
// copy sections from DLL file block to new memory location
CopySections(data, old_header, result);
// adjust base address of imported data
locationDelta = (SIZE_T)(code - old_header->OptionalHeader.ImageBase);
if (locationDelta != 0) {
PerformBaseRelocation(result, locationDelta);
}
// 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"
FinalizeSections(result);
// get entry point of loaded library
if (result->headers->OptionalHeader.AddressOfEntryPoint != 0) {
DllEntry = (DllEntryProc) (code + result->headers->OptionalHeader.AddressOfEntryPoint);
// notify library about attaching to process
successfull = (*DllEntry)((HINSTANCE)code, DLL_PROCESS_ATTACH, 0);
if (!successfull) {
SetLastError(ERROR_DLL_INIT_FAILED);
goto error;
}
result->initialized = 1;
}
return (HMEMORYMODULE)result;
error:
// cleanup
MemoryFreeLibrary(result);
return NULL;
}
#ifdef USE_BINARY_SEARCH
int _compare(const struct NAME_TABLE *p1, const struct NAME_TABLE *p2)
{
return _stricmp(p1->name, p2->name);
}
int _find(LPCSTR *name, const struct NAME_TABLE *p)
{
return _stricmp(*name, p->name);
}
#endif
FARPROC MemoryGetProcAddress(HMEMORYMODULE module, LPCSTR name)
{
unsigned char *codeBase = ((PMEMORYMODULE)module)->codeBase;
int idx=-1;
DWORD i, *nameRef;
WORD *ordinal;
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;
}
#ifdef USE_BINARY_SEARCH
// build name table and sort it by names
if (((PMEMORYMODULE)module)->name_table == NULL) {
struct NAME_TABLE *entry = (struct NAME_TABLE*)malloc(exports->NumberOfNames
* sizeof(struct NAME_TABLE));
((PMEMORYMODULE)module)->name_table = entry;
if (entry == NULL) {
((PMEMORYMODULE)module)->numEntries = 0;
SetLastError(ERROR_OUTOFMEMORY);
return NULL;
}
((PMEMORYMODULE)module)->numEntries = exports->NumberOfNames;
nameRef = (DWORD *) (codeBase + exports->AddressOfNames);
ordinal = (WORD *) (codeBase + exports->AddressOfNameOrdinals);
for (i=0; i<exports->NumberOfNames; i++, nameRef++, ordinal++) {
entry->name = (const char *) (codeBase + (*nameRef));
entry->idx = *ordinal;
entry++;
}
entry = ((PMEMORYMODULE)module)->name_table;
qsort(entry, exports->NumberOfNames, sizeof(struct NAME_TABLE), _compare);
}
if (!IS_INTRESOURCE(name)) {
// search function name in list of exported names with binary search
if (((PMEMORYMODULE)module)->name_table) {
struct NAME_TABLE *found;
found = bsearch(&name,
((PMEMORYMODULE)module)->name_table,
exports->NumberOfNames,
sizeof(struct NAME_TABLE), _find);
if (found)
idx = found->idx;
}
} else
idx = (int)name;
#else
if (!IS_INTRESOURCE(name)) {
// search function name in list of exported names
nameRef = (DWORD *) (codeBase + exports->AddressOfNames);
ordinal = (WORD *) (codeBase + exports->AddressOfNameOrdinals);
for (i=0; i<exports->NumberOfNames; i++, nameRef++, ordinal++) {
if (_stricmp(name, (const char *) (codeBase + (*nameRef))) == 0) {
idx = *ordinal;
break;
}
}
} else
idx = (int)name;
#endif
if (idx == -1) {
// exported symbol not found
SetLastError(ERROR_PROC_NOT_FOUND);
return NULL;
}
if ((DWORD)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)
{
int i;
PMEMORYMODULE module = (PMEMORYMODULE)mod;
if (module != NULL) {
if (module->initialized != 0) {
// notify library about detaching from process
DllEntryProc DllEntry = (DllEntryProc) (module->codeBase + module->headers->OptionalHeader.AddressOfEntryPoint);
(*DllEntry)((HINSTANCE)module->codeBase, DLL_PROCESS_DETACH, 0);
module->initialized = 0;
}
#ifdef USE_BINARY_SEARCH
if (module->name_table != NULL) {
free(module->name_table);
}
#endif
if (module->modules != NULL) {
// free previously opened libraries
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);
}
}
#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;
#if defined(UNICODE)
long int tmpkey = (WORD) wcstol((TCHAR *) &key[1], &endpos, 10);
#else
long int tmpkey = (WORD) strtol((TCHAR *) &key[1], &endpos, 10);
#endif
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) (POINTER_TYPE) 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 {
#if !defined(UNICODE)
char *searchKey = NULL;
int searchKeyLength = 0;
#endif
start = 0;
end = resources->NumberOfIdEntries;
while (end > start) {
// resource names are always stored using 16bit characters
int cmp;
PIMAGE_RESOURCE_DIR_STRING_U resourceString;
middle = (start + end) >> 1;
resourceString = (PIMAGE_RESOURCE_DIR_STRING_U) (((char *) root) + (entries[middle].Name & 0x7FFFFFFF));
#if !defined(UNICODE)
if (searchKey == NULL || searchKeyLength < resourceString->Length) {
void *tmp = realloc(searchKey, resourceString->Length);
if (tmp == NULL) {
break;
}
searchKey = (char *) tmp;
}
wcstombs(searchKey, resourceString->NameString, resourceString->Length);
cmp = strncmp(key, searchKey, resourceString->Length);
#else
cmp = wcsncmp(key, resourceString->NameString, resourceString->Length);
#endif
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)
free(searchKey);
#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) (POINTER_TYPE) 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;
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;
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 = 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;
}