Get a section header address by only the name of the section

GetSectionHdrByName.c

#define IMAGE_FIRST_SECTION(ntheader) \
  ((PIMAGE_SECTION_HEADER)(ULONG_PTR)((const BYTE *)&((const IMAGE_NT_HEADERS *)(ntheader))->OptionalHeader + \
                           ((const IMAGE_NT_HEADERS *)(ntheader))->FileHeader.SizeOfOptionalHeader))
 
// IMAGE_FIRST_SECTION = Pointer to the starting point of optional header “OPTHDROFFSET macro” + SizeOfOptionalHeader which exist in the image file header struct. 
 
BOOL    WINAPI GetSectionHdrByName (
    LPVOID                   lpFile, // pointer to the  file
    IMAGE_SECTION_HEADER     *sh, // returned pointer to the section header
    char                     *szSection // name of the section to find it. 
)
 
{
    PIMAGE_SECTION_HEADER    psh;
    int                      nSections = NumOfSections (lpFile);
    int                      i;
 
 
    if ((psh = (PIMAGE_SECTION_HEADER) IMAGE_FIRST_SECTION (lpFile)) !=
         NULL)
        {
        /* find the section by name */
        for (i=0; i<nSections; i++){ // loop through all sections. 
 
            if (!strcmp (psh->Name, szSection)) // comparing by the name 
                {
                /* copy data to header */
                CopyMemory ((LPVOID)sh,
                            (LPVOID)psh,
                            sizeof (IMAGE_SECTION_HEADER));
                return TRUE;
                }
            else
                psh++;
            }
        }
 
    return FALSE;
}
int   WINAPI NumOfSections (
    LPVOID    lpFile)
{
    /* Number of sections is indicated in file header. */
    return (int)((PIMAGE_FILE_HEADER)
                  PEFHDROFFSET (lpFile))->NumberOfSections);
}
// *  
continue to the question: 
“Can we get a certain Data Directory from VirtualAddress in the above struct ? “
To find the directory virtual address: 
* //
LPVOID  WINAPI ImageDirectoryOffset (
        LPVOID    lpFile,
        DWORD     dwIMAGE_DIRECTORY // index of the array.
)
{
    PIMAGE_OPTIONAL_HEADER   poh;
    PIMAGE_SECTION_HEADER    psh;
    int                      nSections = NumOfSections (lpFile);
    int                      i = 0;
    LPVOID                   VAImageDir;
 
    /* Must be 0 thru (NumberOfRvaAndSizes-1). */
    if (dwIMAGE_DIRECTORY >= poh->NumberOfRvaAndSizes)
        return NULL;
 
    /* Retrieve offsets to optional and section headers. */
    poh = (PIMAGE_OPTIONAL_HEADER)OPTHDROFFSET (lpFile);
    psh = (PIMAGE_SECTION_HEADER)SECHDROFFSET (lpFile);
 
    /* Locate image directory's relative virtual address. */
    VAImageDir = (LPVOID)poh->DataDirectory
                       [dwIMAGE_DIRECTORY].VirtualAddress;
 
    /* Locate section containing image directory. */
    while (i++<nSections)
        {
        if (psh->VirtualAddress <= (DWORD)VAImageDir &&
            psh->VirtualAddress +
                 psh->SizeOfRawData > (DWORD)VAImageDir)
// check if the Virtual address in the optional header “VAImageDir” is inside the current section.
            break;
        psh++;
        }
 
    if (i > nSections)
        return NULL;
 
    /* Return image import directory offset. */
    return (LPVOID)(
      (  
(int)lpFile + (int)VAImageDir - psh->VirtualAddress
       ) 
       +
                         (int)psh->PointerToRawData
);