c++ - 将 FindResource 与内存缓冲区一起使用

Question

我有一个包含有效 exe 文件图像的内存缓冲区，我想从中提取一些资源。
为此，我正在使用 FindResource 函数，但该函数需要一个 HMODULE，并在为 exe 提供内存缓冲区时崩溃。

有没有办法让它与内存缓冲区一起工作，而不是将 exe 写入临时文件，使用 LoadLibrary 加载它，然后执行所需的工作？

Answer 1

I'm have a memory buffer which contains a valid file image

以哪种形式？我猜比原始的(如在磁盘上)。但您需要“映射为图像”内存才能使用 FindResource。不是自己硬映射你的原始图像(如果你只想访问资源，而不是从内存中执行它)代码示例:

PVOID MapImage(PIMAGE_DOS_HEADER pvRawData, ULONG cbRawData)
{
    if (cbRawData < sizeof(IMAGE_DOS_HEADER))
    {
        return 0;
    }

    if (pvRawData->e_magic != IMAGE_DOS_SIGNATURE)
    {
        return 0;
    }

    ULONG e_lfanew = pvRawData->e_lfanew, s = e_lfanew + sizeof(IMAGE_NT_HEADERS);

    if (e_lfanew >= s || s > cbRawData)
    {
        return 0;
    }

    PIMAGE_NT_HEADERS pinth = (PIMAGE_NT_HEADERS)RtlOffsetToPointer(pvRawData, e_lfanew);

    if (pinth->Signature != IMAGE_NT_SIGNATURE)
    {
        return 0;
    }

    ULONG SizeOfImage = pinth->OptionalHeader.SizeOfImage, SizeOfHeaders = pinth->OptionalHeader.SizeOfHeaders;

    s = e_lfanew + SizeOfHeaders;

    if (SizeOfHeaders > SizeOfImage || SizeOfHeaders >= s || s > cbRawData)
    {
        return 0;
    }

    s = FIELD_OFFSET(IMAGE_NT_HEADERS, OptionalHeader) + pinth->FileHeader.SizeOfOptionalHeader;

    if (s > SizeOfHeaders)
    {
        return 0;
    }

    ULONG NumberOfSections = pinth->FileHeader.NumberOfSections;

    PIMAGE_SECTION_HEADER pish = (PIMAGE_SECTION_HEADER)RtlOffsetToPointer(pinth, s);

    ULONG Size;

    if (NumberOfSections)
    {
        if (e_lfanew + s + NumberOfSections * sizeof(IMAGE_SECTION_HEADER) > SizeOfHeaders)
        {
            return 0;
        }

        do 
        {
            if (Size = min(pish->Misc.VirtualSize, pish->SizeOfRawData))
            {
                union {
                    ULONG VirtualAddress, PointerToRawData;
                };

                VirtualAddress = pish->VirtualAddress, s = VirtualAddress + Size;

                if (VirtualAddress > s || s > SizeOfImage)
                {
                    return 0;
                }

                PointerToRawData = pish->PointerToRawData, s = PointerToRawData + Size;

                if (PointerToRawData > s || s > cbRawData)
                {
                    return 0;
                }
            }

        } while (pish++, --NumberOfSections);
    }

    PVOID ImageBase = VirtualAlloc(0, SizeOfImage, MEM_COMMIT, PAGE_READWRITE);

    if (!ImageBase)
    {
        return 0;
    }

    memcpy(ImageBase, pvRawData, SizeOfHeaders);

    if (NumberOfSections = pinth->FileHeader.NumberOfSections)
    {
        do 
        {
            --pish;

            if (Size = min(pish->Misc.VirtualSize, pish->SizeOfRawData))
            {
                memcpy(RtlOffsetToPointer(ImageBase, pish->VirtualAddress),
                    RtlOffsetToPointer(pvRawData, pish->PointerToRawData), Size);
            }

        } while (--NumberOfSections);

    }

    return ImageBase;
}

void Test(PVOID pvRawData, ULONG cbRawData, PCWSTR lpType, PCWSTR lpName)
{
    if (HMODULE ImageBase = (HMODULE)MapImage((PIMAGE_DOS_HEADER)pvRawData, cbRawData))
    {
        if (HRSRC hResInfo = FindResource(ImageBase, lpName, lpType))
        {
            if (HGLOBAL hg = LoadResource(ImageBase, hResInfo))
            {
                __nop();
            }
        }

        VirtualFree(ImageBase, 0, MEM_RELEASE);
    }
}

包含检查有效数据大小的 MapImage。但是，如果您确定 (pvRawData, cbRawData) 100% 正确 - 您可以跳过此检查并简化代码

//我根据@IInspectable 注释编辑测试 函数 - 删除 __try/__except - 这里不需要