Custom GetProcAddress, GetModuleHandleA and some dbghelp.dll functions

Custom GetProcAddress, GetModuleHandleA and some dbghelp.dll functions

The code supports both 32bit and 64bit and cross platform processing ( as example on 64bit processing 32bit images )

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/// <summary>
/// Retrieves the address of an exported function inside the specified module
/// </summary>
/// <param name="hModule">Address of the module</param>
/// <param name="lpProcName">Name of the exported procedure</param>
/// <param name="MappedAsImage">Is the module mapped or a raw file? (TRUE / FALSE)</param>
/// <returns>returns the exported procedure address inside the specified module</returns>
FARPROC WINAPI GetExportAddress( _In_ HMODULE hModule, _In_ LPCSTR lpProcName, _In_ BOOLEAN MappedAsImage );

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/// <summary>
/// Retrieves the address of an loaded module by name
/// </summary>
/// <param name="lpModuleName">name of the module, zero for current module</param>
/// <returns>returns address of the module in memory</returns>
HMODULE WINAPI GetModuleA( _In_opt_ LPCSTR  lpModuleName );
HMODULE WINAPI GetModuleW( _In_opt_ LPCWSTR lpModuleName );

dbghelp functions

The functions below are based on the original windows API's I reverse engineered from dbghelp.dll

ImageNtHeader official documentation

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/// <summary>
/// Locates the IMAGE_NT_HEADERS structure in a PE image and returns a pointer to the data
/// </summary>
/// <param name="Base">The base address of an image that is mapped into memory by a call to the MapViewOfFile function</param>
/// <returns>If the function succeeds, the return value is a pointer to an IMAGE_NT_HEADERS structure</returns>
IMAGE_NT_HEADERS* WINAPI ImageNtHeader( _In_ PVOID Base );

ImageRvaToVa official documentation

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/// <summary>
/// Locates a relative virtual address (RVA) within the image header of a file that is mapped as a file and returns the virtual address of the corresponding byte in the file.
/// </summary>
/// <param name="NtHeaders">A pointer to an IMAGE_NT_HEADERS structure. This structure can be obtained by calling the ImageNtHeader function</param>
/// <param name="Base">The base address of an image that is mapped into memory through a call to the MapViewOfFile / ReadFile function</param>
/// <param name="Rva">The relative virtual address to be located</param>
/// <returns>If the function succeeds, the return value is the virtual address in the mapped file</returns>
PVOID WINAPI ImageRvaToVa(PIMAGE_NT_HEADERS NtHeaders, void* Base, DWORD Rva);

/// <summary>
/// Locates a relative virtual address (RVA) within the image header of a file that is mapped as a file and returns a pointer to the section table entry for that RVA
/// </summary>
/// <param name="NtHeaders">A pointer to an IMAGE_NT_HEADERS structure. This structure can be obtained by calling the ImageNtHeader function.</param>
/// <param name="Base">This parameter is reserved</param>
/// <param name="Rva">The relative virtual address to be located</param>
/// <returns>If the function succeeds, the return value is a pointer to an IMAGE_SECTION_HEADER structure</returns>
IMAGE_SECTION_HEADER* WINAPI ImageVaToSection(PIMAGE_NT_HEADERS NtHeaders, PVOID Base, void* Va);

ImageDirectoryEntryToDataEx official documentation

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/// <summary>
/// Locates a directory entry within the image header and returns the address of the data for the directory entry
/// </summary>
/// <param name="Base">The base address of the image or data file</param>
/// <param name="MappedAsImage">If the flag is TRUE, the file is mapped by the system as an image. If this flag is FALSE, the file is mapped as a data file by the MapViewOfFile/ ReadFile function</param>
/// <param name="DirectoryEntry">The directory entry to be located</param>
/// <param name="Size">A pointer to a variable that receives the size of the data for the directory entry that is located</param>
/// <returns>If the function succeeds, the return value is a pointer to the data for the directory entry</returns>
PVOID WINAPI ImageDirectoryEntryToDataEx(PVOID Base, BOOLEAN MappedAsImage, USHORT DirectoryEntry, ULONG* Size);