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Using the EFI_SHELL_PROTOCOL To Read a File

In this post, I provide the source code for a working UEFI shell application which displays the contents of an ASCII file using functionality provided by the EFI_SHELL_PROTOCOL protocol. The current version of the EFI_SHELL_PROTOCOL is 2.1 and here are the exposed protocol interfaces: typedef struct _EFI_SHELL_PROTOCOL { EFI_SHELL_EXECUTE Execute; EFI_SHELL_GET_ENV GetEnv; EFI_SHELL_SET_ENV SetEnv; EFI_SHELL_GET_ALIAS GetAlias; EFI_SHELL_SET_ALIAS SetAlias; EFI_SHELL_GET_HELP_TEXT GetHelpText; EFI_SHELL_GET_DEVICE_PATH_FROM_MAP GetDevicePathFromMap; EFI_SHELL_GET_MAP_FROM_DEVICE_PATH GetMapFromDevicePath; EFI_SHELL_GET_DEVICE_PATH_FROM_FILE_PATH GetDevicePathFromFilePath; EFI_SHELL_GET_FILE_PATH_FROM_DEVICE_PATH GetFilePathFromDevicePath; EFI_SHELL_SET_MAP SetMap; EFI_SHELL_GET_CUR_DIR GetCurDir; EFI_SHELL_SET_CUR_DIR SetCurDir; EFI_SHELL_OPEN_FILE_LIST OpenFileList; EFI_SHELL_FREE_FILE_LIST FreeFileList; EFI_SHELL_REMOVE_DUP_IN_FILE_LIST RemoveDupInFileList; EFI_SHELL_BATCH_IS_ACTIVE BatchIsActive; EFI_SHELL_IS_ROOT_SHELL IsRootShell; EFI_SHELL_ENABLE_PAGE_BREAK EnablePageBreak; EFI_SHELL_DISABLE_PAGE_BREAK DisablePageBreak; EFI_SHELL_GET_PAGE_BREAK GetPageBreak; EFI_SHELL_GET_DEVICE_NAME GetDeviceName; EFI_SHELL_GET_FILE_INFO GetFileInfo; EFI_SHELL_SET_FILE_INFO SetFileInfo; EFI_SHELL_OPEN_FILE_BY_NAME OpenFileByName; EFI_SHELL_CLOSE_FILE CloseFile;