ldrFile支持(PE ELF EX STUFF等各种格式支持)

本文详细介绍了模块加载过程，包括创建读取器、打开文件、获取文件大小及设置读取器等关键步骤，并展示了如何通过文件I/O操作进行模块加载。

\src\VBox\Runtime\common\ldr\ldrFile.cpp

装载

RTLdrOpen(const char *pszFilename, uint32_t fFlags, RTLDRARCH enmArch, PRTLDRMOD phLdrMod)

A）创建

PRTLDRREADER pReader;
int rc = rtldrFileCreate(&pReader, pszFilename);

rc = rtldrOpenWithReader(pReader, fFlags, enmArch, phLdrMod);

PE格式文件

\src\VBox\Runtime\common\ldr\ldrPE.cpp

文件IO

为装载模块,先通过file io将模块打开.

\src\VBox\Runtime\r3\win\fileio-win.cpp

\src\VBox\Runtime\r3\win\fileaio-win.cpp

一个阻塞，一个异步

A) 打开文件

size_t cchFilename = strlen(pszFilename);
    int rc = VERR_NO_MEMORY;
    PRTLDRREADERFILE pFileReader = (PRTLDRREADERFILE)RTMemAlloc(sizeof(*pFileReader) + cchFilename);
    if (pFileReader)
    {
        memcpy(pFileReader->szFilename, pszFilename, cchFilename + 1);
        rc = RTFileOpen(&pFileReader->File, pszFilename, RTFILE_O_READ | RTFILE_O_OPEN | RTFILE_O_DENY_WRITE);

....

B) 文件大小

rc = RTFileGetSize(pFileReader->File, (uint64_t *)&pFileReader->cbFile);

C) 设置pFileReader

         pFileReader->Core.pfnRead    = rtldrFileRead;
                pFileReader->Core.pfnTell    = rtldrFileTell;
                pFileReader->Core.pfnSize    = rtldrFileSize;
                pFileReader->Core.pfnLogName = rtldrFileLogName;
                pFileReader->Core.pfnMap     = rtldrFileMap;
                pFileReader->Core.pfnUnmap   = rtldrFileUnmap;
                pFileReader->Core.pfnDestroy = rtldrFileDestroy;
                pFileReader->off       = 0;
                pFileReader->cMappings = 0;
                pFileReader->pvMapping = NULL;