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Diffstat (limited to 'Core/MdePkg/Include/Library/FileHandleLib.h')
-rw-r--r-- | Core/MdePkg/Include/Library/FileHandleLib.h | 507 |
1 files changed, 507 insertions, 0 deletions
diff --git a/Core/MdePkg/Include/Library/FileHandleLib.h b/Core/MdePkg/Include/Library/FileHandleLib.h new file mode 100644 index 0000000000..f3423d841c --- /dev/null +++ b/Core/MdePkg/Include/Library/FileHandleLib.h @@ -0,0 +1,507 @@ +/** @file
+ Provides interface to EFI_FILE_HANDLE functionality.
+
+ Copyright (c) 2009 - 2017, Intel Corporation. All rights reserved.<BR>
+ This program and the accompanying materials
+ are licensed and made available under the terms and conditions of the BSD License
+ which accompanies this distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _FILE_HANDLE_LIBRARY_HEADER_
+#define _FILE_HANDLE_LIBRARY_HEADER_
+
+#include <Protocol/SimpleFileSystem.h>
+#include <Guid/FileInfo.h>
+
+/// The tag for use in identifying UNICODE files.
+/// If the file is UNICODE, the first 16 bits of the file will equal this value.
+extern CONST UINT16 gUnicodeFileTag;
+
+/**
+ This function retrieves information about the file for the handle
+ specified and stores it in the allocated pool memory.
+
+ This function allocates a buffer to store the file's information. It is the
+ caller's responsibility to free the buffer.
+
+ @param[in] FileHandle The file handle of the file for which information is
+ being requested.
+
+ @retval NULL Information could not be retrieved.
+ @retval !NULL The information about the file.
+**/
+EFI_FILE_INFO*
+EFIAPI
+FileHandleGetInfo (
+ IN EFI_FILE_HANDLE FileHandle
+ );
+
+/**
+ This function sets the information about the file for the opened handle
+ specified.
+
+ @param[in] FileHandle The file handle of the file for which information
+ is being set.
+
+ @param[in] FileInfo The information to set.
+
+ @retval EFI_SUCCESS The information was set.
+ @retval EFI_INVALID_PARAMETER A parameter was out of range or invalid.
+ @retval EFI_UNSUPPORTED The FileHandle does not support FileInfo.
+ @retval EFI_NO_MEDIA The device has no medium.
+ @retval EFI_DEVICE_ERROR The device reported an error.
+ @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
+ @retval EFI_WRITE_PROTECTED The file or medium is write protected.
+ @retval EFI_ACCESS_DENIED The file was opened read only.
+ @retval EFI_VOLUME_FULL The volume is full.
+**/
+EFI_STATUS
+EFIAPI
+FileHandleSetInfo (
+ IN EFI_FILE_HANDLE FileHandle,
+ IN CONST EFI_FILE_INFO *FileInfo
+ );
+
+/**
+ This function reads information from an opened file.
+
+ If FileHandle is not a directory, the function reads the requested number of
+ bytes from the file at the file's current position and returns them in Buffer.
+ If the read goes beyond the end of the file, the read length is truncated to the
+ end of the file. The file's current position is increased by the number of bytes
+ returned. If FileHandle is a directory, the function reads the directory entry
+ at the file's current position and returns the entry in Buffer. If the Buffer
+ is not large enough to hold the current directory entry, then
+ EFI_BUFFER_TOO_SMALL is returned and the current file position is not updated.
+ BufferSize is set to be the size of the buffer needed to read the entry. On
+ success, the current position is updated to the next directory entry. If there
+ are no more directory entries, the read returns a zero-length buffer.
+ EFI_FILE_INFO is the structure returned as the directory entry.
+
+ @param[in] FileHandle The opened file handle.
+ @param[in, out] BufferSize On input, the size of buffer in bytes. On return,
+ the number of bytes written.
+ @param[out] Buffer The buffer to put read data into.
+
+ @retval EFI_SUCCESS Data was read.
+ @retval EFI_NO_MEDIA The device has no media.
+ @retval EFI_DEVICE_ERROR The device reported an error.
+ @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
+ @retval EFI_BUFFER_TO_SMALL Buffer is too small. ReadSize contains required
+ size.
+
+**/
+EFI_STATUS
+EFIAPI
+FileHandleRead(
+ IN EFI_FILE_HANDLE FileHandle,
+ IN OUT UINTN *BufferSize,
+ OUT VOID *Buffer
+ );
+
+/**
+ Write data to a file.
+
+ This function writes the specified number of bytes to the file at the current
+ file position. The current file position is advanced the actual number of bytes
+ written, which is returned in BufferSize. Partial writes only occur when there
+ has been a data error during the write attempt (such as "volume space full").
+ The file is automatically grown to hold the data if required. Direct writes to
+ opened directories are not supported.
+
+ @param[in] FileHandle The opened file for writing.
+ @param[in, out] BufferSize On input, the number of bytes in Buffer. On output,
+ the number of bytes written.
+ @param[in] Buffer The buffer containing data to write is stored.
+
+ @retval EFI_SUCCESS Data was written.
+ @retval EFI_UNSUPPORTED Writes to an open directory are not supported.
+ @retval EFI_NO_MEDIA The device has no media.
+ @retval EFI_DEVICE_ERROR The device reported an error.
+ @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
+ @retval EFI_WRITE_PROTECTED The device is write-protected.
+ @retval EFI_ACCESS_DENIED The file was opened for read only.
+ @retval EFI_VOLUME_FULL The volume is full.
+**/
+EFI_STATUS
+EFIAPI
+FileHandleWrite(
+ IN EFI_FILE_HANDLE FileHandle,
+ IN OUT UINTN *BufferSize,
+ IN VOID *Buffer
+ );
+
+/**
+ Close an open file handle.
+
+ This function closes a specified file handle. All "dirty" cached file data is
+ flushed to the device, and the file is closed. In all cases the handle is
+ closed.
+
+ @param[in] FileHandle The file handle to close.
+
+ @retval EFI_SUCCESS The file handle was closed successfully.
+**/
+EFI_STATUS
+EFIAPI
+FileHandleClose (
+ IN EFI_FILE_HANDLE FileHandle
+ );
+
+/**
+ Delete a file and close the handle.
+
+ This function closes and deletes a file. In all cases the file handle is closed.
+ If the file cannot be deleted, the warning code EFI_WARN_DELETE_FAILURE is
+ returned, but the handle is still closed.
+
+ @param[in] FileHandle The file handle to delete.
+
+ @retval EFI_SUCCESS The file was closed successfully.
+ @retval EFI_WARN_DELETE_FAILURE The handle was closed, but the file was not
+ deleted.
+ @retval INVALID_PARAMETER One of the parameters has an invalid value.
+**/
+EFI_STATUS
+EFIAPI
+FileHandleDelete (
+ IN EFI_FILE_HANDLE FileHandle
+ );
+
+/**
+ Set the current position in a file.
+
+ This function sets the current file position for the handle to the position
+ supplied. With the exception of moving to position 0xFFFFFFFFFFFFFFFF, only
+ absolute positioning is supported, and moving past the end of the file is
+ allowed (a subsequent write would grow the file). Moving to position
+ 0xFFFFFFFFFFFFFFFF causes the current position to be set to the end of the file.
+ If FileHandle is a directory, the only position that may be set is zero. This
+ has the effect of starting the read process of the directory entries over again.
+
+ @param[in] FileHandle The file handle on which the position is being set.
+ @param[in] Position The byte position from the beginning of the file.
+
+ @retval EFI_SUCCESS The operation completed successfully.
+ @retval EFI_UNSUPPORTED The request for non-zero is not valid on
+ directories.
+ @retval INVALID_PARAMETER One of the parameters has an invalid value.
+**/
+EFI_STATUS
+EFIAPI
+FileHandleSetPosition (
+ IN EFI_FILE_HANDLE FileHandle,
+ IN UINT64 Position
+ );
+
+/**
+ Gets a file's current position.
+
+ This function retrieves the current file position for the file handle. For
+ directories, the current file position has no meaning outside of the file
+ system driver. As such, the operation is not supported. An error is returned
+ if FileHandle is a directory.
+
+ @param[in] FileHandle The open file handle on which to get the position.
+ @param[out] Position The byte position from beginning of file.
+
+ @retval EFI_SUCCESS The operation completed successfully.
+ @retval INVALID_PARAMETER One of the parameters has an invalid value.
+ @retval EFI_UNSUPPORTED The request is not valid on directories.
+**/
+EFI_STATUS
+EFIAPI
+FileHandleGetPosition (
+ IN EFI_FILE_HANDLE FileHandle,
+ OUT UINT64 *Position
+ );
+/**
+ Flushes data on a file.
+
+ This function flushes all modified data associated with a file to a device.
+
+ @param[in] FileHandle The file handle on which to flush data.
+
+ @retval EFI_SUCCESS The data was flushed.
+ @retval EFI_NO_MEDIA The device has no media.
+ @retval EFI_DEVICE_ERROR The device reported an error.
+ @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
+ @retval EFI_WRITE_PROTECTED The file or medium is write protected.
+ @retval EFI_ACCESS_DENIED The file was opened for read only.
+**/
+EFI_STATUS
+EFIAPI
+FileHandleFlush (
+ IN EFI_FILE_HANDLE FileHandle
+ );
+
+/**
+ Function to determine if a given handle is a directory handle.
+
+ Open the file information on the DirHandle and verify that the Attribute
+ includes EFI_FILE_DIRECTORY bit set.
+
+ @param[in] DirHandle Handle to open file.
+
+ @retval EFI_SUCCESS DirHandle is a directory.
+ @retval EFI_INVALID_PARAMETER DirHandle is NULL.
+ The file information returns from FileHandleGetInfo is NULL.
+ @retval EFI_NOT_FOUND DirHandle is not a directory.
+**/
+EFI_STATUS
+EFIAPI
+FileHandleIsDirectory (
+ IN EFI_FILE_HANDLE DirHandle
+ );
+
+/** Retrieve first entry from a directory.
+
+ This function takes an open directory handle and gets information from the
+ first entry in the directory. A buffer is allocated to contain
+ the information and a pointer to the buffer is returned in *Buffer. The
+ caller can use FileHandleFindNextFile() to get subsequent directory entries.
+
+ The buffer will be freed by FileHandleFindNextFile() when the last directory
+ entry is read. Otherwise, the caller must free the buffer, using FreePool,
+ when finished with it.
+
+ @param[in] DirHandle The file handle of the directory to search.
+ @param[out] Buffer The pointer to pointer to buffer for file's information.
+
+ @retval EFI_SUCCESS Found the first file.
+ @retval EFI_NOT_FOUND Cannot find the directory.
+ @retval EFI_NO_MEDIA The device has no media.
+ @retval EFI_DEVICE_ERROR The device reported an error.
+ @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
+ @return Others The status of FileHandleGetInfo, FileHandleSetPosition,
+ or FileHandleRead.
+**/
+EFI_STATUS
+EFIAPI
+FileHandleFindFirstFile (
+ IN EFI_FILE_HANDLE DirHandle,
+ OUT EFI_FILE_INFO **Buffer
+ );
+
+/** Retrieve next entries from a directory.
+
+ To use this function, the caller must first call the FileHandleFindFirstFile()
+ function to get the first directory entry. Subsequent directory entries are
+ retrieved by using the FileHandleFindNextFile() function. This function can
+ be called several times to get each entry from the directory. If the call of
+ FileHandleFindNextFile() retrieved the last directory entry, the next call of
+ this function will set *NoFile to TRUE and free the buffer.
+
+ @param[in] DirHandle The file handle of the directory.
+ @param[out] Buffer The pointer to buffer for file's information.
+ @param[out] NoFile The pointer to boolean when last file is found.
+
+ @retval EFI_SUCCESS Found the next file, or reached last file.
+ @retval EFI_NO_MEDIA The device has no media.
+ @retval EFI_DEVICE_ERROR The device reported an error.
+ @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
+**/
+EFI_STATUS
+EFIAPI
+FileHandleFindNextFile(
+ IN EFI_FILE_HANDLE DirHandle,
+ OUT EFI_FILE_INFO *Buffer,
+ OUT BOOLEAN *NoFile
+ );
+
+/**
+ Retrieve the size of a file.
+
+ This function extracts the file size info from the FileHandle's EFI_FILE_INFO
+ data.
+
+ @param[in] FileHandle The file handle from which size is retrieved.
+ @param[out] Size The pointer to size.
+
+ @retval EFI_SUCCESS Operation was completed successfully.
+ @retval EFI_DEVICE_ERROR Cannot access the file.
+ @retval EFI_INVALID_PARAMETER FileHandle is NULL.
+ Size is NULL.
+**/
+EFI_STATUS
+EFIAPI
+FileHandleGetSize (
+ IN EFI_FILE_HANDLE FileHandle,
+ OUT UINT64 *Size
+ );
+
+/**
+ Set the size of a file.
+
+ This function changes the file size info from the FileHandle's EFI_FILE_INFO
+ data.
+
+ @param[in] FileHandle The file handle whose size is to be changed.
+ @param[in] Size The new size.
+
+ @retval EFI_SUCCESS The operation completed successfully.
+ @retval EFI_DEVICE_ERROR Cannot access the file.
+ @retval EFI_INVALID_PARAMETER FileHandle is NULL.
+**/
+EFI_STATUS
+EFIAPI
+FileHandleSetSize (
+ IN EFI_FILE_HANDLE FileHandle,
+ IN UINT64 Size
+ );
+
+/**
+ Function to get a full filename given a EFI_FILE_HANDLE somewhere lower on the
+ directory 'stack'. If the file is a directory, then append the '\' char at the
+ end of name string. If it's not a directory, then the last '\' should not be
+ added.
+
+ @param[in] Handle Handle to the Directory or File to create path to.
+ @param[out] FullFileName Pointer to pointer to generated full file name. It
+ is the responsibility of the caller to free this memory
+ with a call to FreePool().
+ @retval EFI_SUCCESS The operation was successful and FullFileName is valid.
+ @retval EFI_INVALID_PARAMETER Handle was NULL.
+ @retval EFI_INVALID_PARAMETER FullFileName was NULL.
+ @retval EFI_OUT_OF_MEMORY A memory allocation failed.
+**/
+EFI_STATUS
+EFIAPI
+FileHandleGetFileName (
+ IN CONST EFI_FILE_HANDLE Handle,
+ OUT CHAR16 **FullFileName
+ );
+
+/**
+ Function to read a single line (up to but not including the \n) from a file.
+
+ If the position upon start is 0, then the Ascii Boolean will be set. This should be
+ maintained and not changed for all operations with the same file.
+ The function will not return the \r and \n character in buffer. When an empty line is
+ read a CHAR_NULL character will be returned in buffer.
+
+ @param[in] Handle FileHandle to read from.
+ @param[in, out] Buffer The pointer to buffer to read into.
+ @param[in, out] Size The pointer to number of bytes in Buffer.
+ @param[in] Truncate If the buffer is large enough, this has no effect.
+ If the buffer is is too small and Truncate is TRUE,
+ the line will be truncated.
+ If the buffer is is too small and Truncate is FALSE,
+ then no read will occur.
+
+ @param[in, out] Ascii Boolean value for indicating whether the file is
+ Ascii (TRUE) or UCS2 (FALSE).
+
+ @retval EFI_SUCCESS The operation was successful. The line is stored in
+ Buffer.
+ @retval EFI_INVALID_PARAMETER Handle was NULL.
+ @retval EFI_INVALID_PARAMETER Size was NULL.
+ @retval EFI_BUFFER_TOO_SMALL Size was not large enough to store the line.
+ Size was updated to the minimum space required.
+ @sa FileHandleRead
+**/
+EFI_STATUS
+EFIAPI
+FileHandleReadLine(
+ IN EFI_FILE_HANDLE Handle,
+ IN OUT CHAR16 *Buffer,
+ IN OUT UINTN *Size,
+ IN BOOLEAN Truncate,
+ IN OUT BOOLEAN *Ascii
+ );
+
+/**
+ Function to read a single line from a file. The \n is not included in the returned
+ buffer. The returned buffer must be callee freed.
+
+ If the position upon start is 0, then the Ascii Boolean will be set. This should be
+ maintained and not changed for all operations with the same file.
+
+ @param[in] Handle FileHandle to read from.
+ @param[in, out] Ascii Boolean value for indicating whether the file is
+ Ascii (TRUE) or UCS2 (FALSE).
+
+ @return The line of text from the file.
+
+ @sa FileHandleReadLine
+**/
+CHAR16*
+EFIAPI
+FileHandleReturnLine(
+ IN EFI_FILE_HANDLE Handle,
+ IN OUT BOOLEAN *Ascii
+ );
+
+/**
+ Function to write a line of text to a file.
+
+ If the file is a Unicode file (with UNICODE file tag) then write the unicode
+ text.
+ If the file is an ASCII file then write the ASCII text.
+ If the size of file is zero (without file tag at the beginning) then write
+ ASCII text as default.
+
+ @param[in] Handle FileHandle to write to.
+ @param[in] Buffer Buffer to write, if NULL the function will
+ take no action and return EFI_SUCCESS.
+
+ @retval EFI_SUCCESS The data was written.
+ Buffer is NULL.
+ @retval EFI_INVALID_PARAMETER Handle is NULL.
+ @retval EFI_OUT_OF_RESOURCES Unable to allocate temporary space for ASCII
+ string due to out of resources.
+
+ @sa FileHandleWrite
+**/
+EFI_STATUS
+EFIAPI
+FileHandleWriteLine(
+ IN EFI_FILE_HANDLE Handle,
+ IN CHAR16 *Buffer
+ );
+
+/**
+ Function to take a formatted argument and print it to a file.
+
+ @param[in] Handle The file handle for the file to write to.
+ @param[in] Format The format argument (see printlib for the format specifier).
+ @param[in] ... The variable arguments for the format.
+
+ @retval EFI_SUCCESS The operation was successful.
+ @retval other A return value from FileHandleWriteLine.
+
+ @sa FileHandleWriteLine
+**/
+EFI_STATUS
+EFIAPI
+FileHandlePrintLine(
+ IN EFI_FILE_HANDLE Handle,
+ IN CONST CHAR16 *Format,
+ ...
+ );
+
+/**
+ Function to determine if a FILE_HANDLE is at the end of the file.
+
+ This will NOT work on directories.
+
+ If Handle is NULL, then ASSERT().
+
+ @param[in] Handle The file handle.
+
+ @retval TRUE The position is at the end of the file.
+ @retval FALSE The position is not at the end of the file.
+**/
+BOOLEAN
+EFIAPI
+FileHandleEof(
+ IN EFI_FILE_HANDLE Handle
+ );
+
+#endif //_FILE_HANDLE_LIBRARY_HEADER_
+
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