-/* $Id: rtl.c,v 1.19 2004/06/27 14:15:33 navaraf Exp $
+/* $Id$
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
- * FILE: ntoskrnl/ldr/loader.c
+ * FILE: ntoskrnl/ldr/rtl.c
* PURPOSE: Loader utilities
+ *
* PROGRAMMERS: Jean Michault
* Rex Jolliff (rex@lvcablemodem.com)
*/
/* INCLUDES *****************************************************************/
-#include <ddk/ntddk.h>
-#include <internal/module.h>
-#include <internal/ntoskrnl.h>
-#include <internal/ob.h>
-#include <internal/ps.h>
-#include <internal/ldr.h>
-
+#include <ntoskrnl.h>
#define NDEBUG
#include <internal/debug.h>
/* FUNCTIONS ****************************************************************/
-
-/*
- * @implemented
- */
-PIMAGE_NT_HEADERS STDCALL
-RtlImageNtHeader (IN PVOID BaseAddress)
-{
- PIMAGE_DOS_HEADER DosHeader;
- PIMAGE_NT_HEADERS NTHeaders;
-
- DosHeader = (PIMAGE_DOS_HEADER)BaseAddress;
- NTHeaders = (PIMAGE_NT_HEADERS)((char*)BaseAddress + DosHeader->e_lfanew);
- if ((DosHeader->e_magic != IMAGE_DOS_MAGIC)
- || (DosHeader->e_lfanew == 0L)
- || (*(PULONG) NTHeaders != IMAGE_PE_MAGIC))
- {
- return(NULL);
- }
- return(NTHeaders);
-}
-
-
-/*
- * @implemented
- */
-PVOID STDCALL
-RtlImageDirectoryEntryToData (IN PVOID BaseAddress,
- IN BOOLEAN ImageLoaded,
- IN ULONG Directory,
- OUT PULONG Size)
-{
- PIMAGE_NT_HEADERS NtHeader;
- PIMAGE_SECTION_HEADER SectionHeader;
- ULONG Va;
- ULONG Count;
-
- NtHeader = RtlImageNtHeader (BaseAddress);
- if (NtHeader == NULL)
- return NULL;
-
- if (Directory >= NtHeader->OptionalHeader.NumberOfRvaAndSizes)
- return NULL;
-
- Va = NtHeader->OptionalHeader.DataDirectory[Directory].VirtualAddress;
- if (Va == 0)
- return NULL;
-
- if (Size)
- *Size = NtHeader->OptionalHeader.DataDirectory[Directory].Size;
-
- if (ImageLoaded)
- return (PVOID)((char*)BaseAddress + Va);
-
- /* image mapped as ordinary file, we must find raw pointer */
- SectionHeader = (PIMAGE_SECTION_HEADER)(NtHeader + 1);
- Count = NtHeader->FileHeader.NumberOfSections;
- while (Count--)
- {
- if (SectionHeader->VirtualAddress == Va)
- return (PVOID)((char*)BaseAddress + SectionHeader->PointerToRawData);
- SectionHeader++;
- }
-
- return NULL;
-}
-
-
-PIMAGE_SECTION_HEADER
-STDCALL
-RtlImageRvaToSection (
- PIMAGE_NT_HEADERS NtHeader,
- PVOID BaseAddress,
- ULONG Rva
- )
-{
- PIMAGE_SECTION_HEADER Section;
- ULONG Va;
- ULONG Count;
-
- Count = NtHeader->FileHeader.NumberOfSections;
- Section = (PIMAGE_SECTION_HEADER)((ULONG)&NtHeader->OptionalHeader +
- NtHeader->FileHeader.SizeOfOptionalHeader);
- while (Count)
- {
- Va = Section->VirtualAddress;
- if ((Va <= Rva) &&
- (Rva < Va + Section->SizeOfRawData))
- return Section;
- Section++;
- }
- return NULL;
-}
-
-
-ULONG
-STDCALL
-RtlImageRvaToVa (
- PIMAGE_NT_HEADERS NtHeader,
- PVOID BaseAddress,
- ULONG Rva,
- PIMAGE_SECTION_HEADER *SectionHeader
- )
-{
- PIMAGE_SECTION_HEADER Section = NULL;
-
- if (SectionHeader)
- Section = *SectionHeader;
-
- if (Section == NULL ||
- Rva < Section->VirtualAddress ||
- Rva >= Section->VirtualAddress + Section->SizeOfRawData)
- {
- Section = RtlImageRvaToSection (NtHeader, BaseAddress, Rva);
- if (Section == NULL)
- return 0;
-
- if (SectionHeader)
- *SectionHeader = Section;
- }
-
- return (ULONG)((char*)BaseAddress +
- Rva +
- Section->PointerToRawData -
- Section->VirtualAddress);
-}
-
-#define RVA(m, b) ((ULONG)b + m)
-
NTSTATUS STDCALL
LdrGetProcedureAddress (IN PVOID BaseAddress,
IN PANSI_STRING Name,
OUT PVOID *ProcedureAddress)
{
PIMAGE_EXPORT_DIRECTORY ExportDir;
+ ULONG ExportDirSize = 0;
PUSHORT OrdinalPtr;
PULONG NamePtr;
+ PCHAR CurrentNamePtr;
PULONG AddressPtr;
- ULONG i = 0;
+
+ if (ProcedureAddress == NULL)
+ return STATUS_INVALID_PARAMETER;
/* get the pointer to the export directory */
- ExportDir = (PIMAGE_EXPORT_DIRECTORY)
- RtlImageDirectoryEntryToData (BaseAddress, TRUE,
- IMAGE_DIRECTORY_ENTRY_EXPORT, &i);
-
- if (!ExportDir || !i || !ProcedureAddress)
- {
- return(STATUS_INVALID_PARAMETER);
- }
-
- AddressPtr = (PULONG)RVA((char*)BaseAddress, ExportDir->AddressOfFunctions);
+ ExportDir = RtlImageDirectoryEntryToData(BaseAddress, TRUE,
+ IMAGE_DIRECTORY_ENTRY_EXPORT,
+ &ExportDirSize);
+
+ if (ExportDir == NULL || ExportDirSize == 0)
+ return STATUS_INVALID_PARAMETER;
+
+ AddressPtr = (PULONG)RVA(BaseAddress, ExportDir->AddressOfFunctions);
+
if (Name && Name->Length)
- {
- LONG minn, maxn;
-
- /* by name */
- OrdinalPtr =
- (PUSHORT)RVA((char*)BaseAddress, ExportDir->AddressOfNameOrdinals);
- NamePtr = (PULONG)RVA((char*)BaseAddress, ExportDir->AddressOfNames);
-
- minn = 0; maxn = ExportDir->NumberOfNames;
- while (minn <= maxn)
- {
- LONG mid;
- LONG res;
-
- mid = (minn + maxn) / 2;
- res = _strnicmp(Name->Buffer, (PCH)RVA((char*)BaseAddress, NamePtr[mid]),
- Name->Length);
- if (res == 0)
- {
- *ProcedureAddress =
- (PVOID)RVA((char*)BaseAddress, AddressPtr[OrdinalPtr[mid]]);
- return(STATUS_SUCCESS);
- }
- else if (res > 0)
- {
- maxn = mid - 1;
- }
- else
- {
- minn = mid + 1;
- }
- }
-
- for (i = 0; i < ExportDir->NumberOfNames; i++, NamePtr++, OrdinalPtr++)
- {
- if (!_strnicmp(Name->Buffer,
- (char*)((char*)BaseAddress + *NamePtr), Name->Length))
- {
- *ProcedureAddress =
- (PVOID)((ULONG)BaseAddress +
- (ULONG)AddressPtr[*OrdinalPtr]);
- return STATUS_SUCCESS;
- }
- }
- CPRINT("LdrGetProcedureAddress: Can't resolve symbol '%Z'\n", Name);
- }
+ {
+ LONG minn, maxn, mid, res;
+
+ /* Search for export by name */
+
+ /*
+ * NOTE: Exports are always sorted and so we can apply binary search.
+ * Also the function names are _case sensitive_, so respect that.
+ * -- Filip Navara, August 1st, 2005
+ */
+
+ OrdinalPtr = (PUSHORT)RVA(BaseAddress, ExportDir->AddressOfNameOrdinals);
+ NamePtr = (PULONG)RVA(BaseAddress, ExportDir->AddressOfNames);
+
+ minn = 0; maxn = ExportDir->NumberOfNames - 1;
+ while (minn <= maxn)
+ {
+ mid = (minn + maxn) / 2;
+ CurrentNamePtr = (PCHAR)RVA(BaseAddress, NamePtr[mid]);
+ res = strncmp(CurrentNamePtr, Name->Buffer, Name->Length);
+ if (res == 0)
+ {
+ /*
+ * Check if the beginning of the name matched, but it's still
+ * not the whole name.
+ */
+ if (CurrentNamePtr[Name->Length] != 0)
+ {
+ res = -1;
+ }
+ else
+ {
+ *ProcedureAddress = (PVOID)RVA(BaseAddress, AddressPtr[OrdinalPtr[mid]]);
+ return STATUS_SUCCESS;
+ }
+ }
+ if (res > 0)
+ maxn = mid - 1;
+ else
+ minn = mid + 1;
+ }
+
+ CPRINT("LdrGetProcedureAddress: Can't resolve symbol '%Z'\n", Name);
+ }
else
- {
- /* by ordinal */
- Ordinal &= 0x0000FFFF;
- if (Ordinal - ExportDir->Base < ExportDir->NumberOfFunctions)
- {
- *ProcedureAddress =
- (PVOID)((ULONG)BaseAddress +
- (ULONG)AddressPtr[Ordinal - ExportDir->Base]);
- return STATUS_SUCCESS;
- }
- CPRINT("LdrGetProcedureAddress: Can't resolve symbol @%d\n",
- Ordinal);
- }
+ {
+ /* Search for export by ordinal */
+
+ Ordinal &= 0x0000FFFF;
+ if (Ordinal - ExportDir->Base < ExportDir->NumberOfFunctions)
+ {
+ *ProcedureAddress = (PVOID)RVA(BaseAddress, AddressPtr[Ordinal - ExportDir->Base]);
+ return STATUS_SUCCESS;
+ }
+
+ CPRINT("LdrGetProcedureAddress: Can't resolve symbol @%d\n", Ordinal);
+ }
return STATUS_PROCEDURE_NOT_FOUND;
}
projects / reactos.git / blobdiff