395 lines
15 KiB
C
395 lines
15 KiB
C
/** @file
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Provides interface to EFI_FILE_HANDLE functionality.
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Copyright (c) 2009, Intel Corporation
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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/**
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This function will retrieve the information about the file for the handle
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specified and store it in allocated pool memory.
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This function allocates a buffer to store the file's information. It is the
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caller's responsibility to free the buffer
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@param FileHandle The file handle of the file for which information is
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being requested.
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@retval NULL information could not be retrieved.
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@return the information about the file
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**/
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EFI_FILE_INFO*
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EFIAPI
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FileHandleGetInfo (
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IN EFI_FILE_HANDLE FileHandle
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);
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/**
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This function will set the information about the file for the opened handle
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specified.
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@param FileHandle The file handle of the file for which information
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is being set
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@param FileInfo The infotmation to set.
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@retval EFI_SUCCESS The information was set.
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@retval EFI_UNSUPPORTED The InformationType is not known.
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@retval EFI_NO_MEDIA The device has no medium.
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@retval EFI_DEVICE_ERROR The device reported an error.
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@retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
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@retval EFI_WRITE_PROTECTED The file or medium is write protected.
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@retval EFI_ACCESS_DENIED The file was opened read only.
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@retval EFI_VOLUME_FULL The volume is full.
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**/
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EFI_STATUS
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EFIAPI
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FileHandleSetInfo (
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IN EFI_FILE_HANDLE FileHandle,
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IN CONST EFI_FILE_INFO *FileInfo
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);
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/**
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This function reads information from an opened file.
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If FileHandle is not a directory, the function reads the requested number of
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bytes from the file at the file's current position and returns them in Buffer.
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If the read goes beyond the end of the file, the read length is truncated to the
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end of the file. The file's current position is increased by the number of bytes
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returned. If FileHandle is a directory, the function reads the directory entry
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at the file's current position and returns the entry in Buffer. If the Buffer
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is not large enough to hold the current directory entry, then
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EFI_BUFFER_TOO_SMALL is returned and the current file position is not updated.
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BufferSize is set to be the size of the buffer needed to read the entry. On
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success, the current position is updated to the next directory entry. If there
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are no more directory entries, the read returns a zero-length buffer.
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EFI_FILE_INFO is the structure returned as the directory entry.
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@param FileHandle the opened file handle
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@param BufferSize on input the size of buffer in bytes. on return
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the number of bytes written.
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@param Buffer the buffer to put read data into.
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@retval EFI_SUCCESS Data was read.
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@retval EFI_NO_MEDIA The device has no media.
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@retval EFI_DEVICE_ERROR The device reported an error.
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@retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
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@retval EFI_BUFFER_TO_SMALL Buffer is too small. ReadSize contains required
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size.
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**/
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EFI_STATUS
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EFIAPI
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FileHandleRead(
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IN EFI_FILE_HANDLE FileHandle,
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IN OUT UINTN *BufferSize,
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OUT VOID *Buffer
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);
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/**
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Write data to a file.
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This function writes the specified number of bytes to the file at the current
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file position. The current file position is advanced the actual number of bytes
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written, which is returned in BufferSize. Partial writes only occur when there
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has been a data error during the write attempt (such as "volume space full").
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The file is automatically grown to hold the data if required. Direct writes to
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opened directories are not supported.
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@param FileHandle The opened file for writing
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@param BufferSize on input the number of bytes in Buffer. On output
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the number of bytes written.
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@param Buffer the buffer containing data to write is stored.
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@retval EFI_SUCCESS Data was written.
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@retval EFI_UNSUPPORTED Writes to an open directory are not supported.
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@retval EFI_NO_MEDIA The device has no media.
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@retval EFI_DEVICE_ERROR The device reported an error.
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@retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
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@retval EFI_WRITE_PROTECTED The device is write-protected.
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@retval EFI_ACCESS_DENIED The file was open for read only.
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@retval EFI_VOLUME_FULL The volume is full.
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**/
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EFI_STATUS
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EFIAPI
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FileHandleWrite(
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IN EFI_FILE_HANDLE FileHandle,
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IN OUT UINTN *BufferSize,
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IN VOID *Buffer
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);
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/**
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Close an open file handle.
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This function closes a specified file handle. All "dirty" cached file data is
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flushed to the device, and the file is closed. In all cases the handle is
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closed.
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@param FileHandle the file handle to close.
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@retval EFI_SUCCESS the file handle was closed sucessfully.
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**/
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EFI_STATUS
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EFIAPI
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FileHandleClose (
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IN EFI_FILE_HANDLE FileHandle
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);
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/**
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Delete a file and close the handle
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This function closes and deletes a file. In all cases the file handle is closed.
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If the file cannot be deleted, the warning code EFI_WARN_DELETE_FAILURE is
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returned, but the handle is still closed.
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@param FileHandle the file handle to delete
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@retval EFI_SUCCESS the file was closed sucessfully
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@retval EFI_WARN_DELETE_FAILURE the handle was closed, but the file was not
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deleted
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@retval INVALID_PARAMETER One of the parameters has an invalid value.
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**/
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EFI_STATUS
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EFIAPI
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FileHandleDelete (
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IN EFI_FILE_HANDLE FileHandle
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);
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/**
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Set the current position in a file.
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This function sets the current file position for the handle to the position
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supplied. With the exception of seeking to position 0xFFFFFFFFFFFFFFFF, only
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absolute positioning is supported, and seeking past the end of the file is
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allowed (a subsequent write would grow the file). Seeking to position
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0xFFFFFFFFFFFFFFFF causes the current position to be set to the end of the file.
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If FileHandle is a directory, the only position that may be set is zero. This
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has the effect of starting the read process of the directory entries over.
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@param FileHandle The file handle on which the position is being set
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@param Position Byte position from begining of file
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@retval EFI_SUCCESS Operation completed sucessfully.
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@retval EFI_UNSUPPORTED the seek request for non-zero is not valid on
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directories.
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@retval INVALID_PARAMETER One of the parameters has an invalid value.
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**/
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EFI_STATUS
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EFIAPI
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FileHandleSetPosition (
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IN EFI_FILE_HANDLE FileHandle,
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IN UINT64 Position
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);
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/**
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Gets a file's current position
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This function retrieves the current file position for the file handle. For
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directories, the current file position has no meaning outside of the file
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system driver and as such the operation is not supported. An error is returned
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if FileHandle is a directory.
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@param FileHandle The open file handle on which to get the position.
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@param Position Byte position from begining of file.
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@retval EFI_SUCCESS the operation completed sucessfully.
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@retval INVALID_PARAMETER One of the parameters has an invalid value.
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@retval EFI_UNSUPPORTED the request is not valid on directories.
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**/
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EFI_STATUS
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EFIAPI
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FileHandleGetPosition (
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IN EFI_FILE_HANDLE FileHandle,
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OUT UINT64 *Position
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);
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/**
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Flushes data on a file
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This function flushes all modified data associated with a file to a device.
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@param FileHandle The file handle on which to flush data
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@retval EFI_SUCCESS The data was flushed.
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@retval EFI_NO_MEDIA The device has no media.
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@retval EFI_DEVICE_ERROR The device reported an error.
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@retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
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@retval EFI_WRITE_PROTECTED The file or medium is write protected.
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@retval EFI_ACCESS_DENIED The file was opened for read only.
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**/
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EFI_STATUS
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EFIAPI
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FileHandleFlush (
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IN EFI_FILE_HANDLE FileHandle
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);
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/**
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function to determine if a given handle is a directory handle
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if DirHandle is NULL then ASSERT()
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open the file information on the DirHandle and verify that the Attribute
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includes EFI_FILE_DIRECTORY bit set.
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@param DirHandle Handle to open file
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@retval EFI_SUCCESS DirHandle is a directory
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@retval EFI_INVALID_PARAMETER DirHandle did not have EFI_FILE_INFO available
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@retval EFI_NOT_FOUND DirHandle is not a directory
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**/
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EFI_STATUS
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EFIAPI
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FileHandleIsDirectory (
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IN EFI_FILE_HANDLE DirHandle
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);
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/**
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Retrieves the first file from a directory
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This function opens a directory and gets the first file's info in the
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directory. Caller can use FileHandleFindNextFile() to get other files. When
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complete the caller is responsible for calling FreePool() on *Buffer.
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@param DirHandle The file handle of the directory to search
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@param Buffer Pointer to pointer to buffer for file's information
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@retval EFI_SUCCESS Found the first file.
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@retval EFI_NOT_FOUND Cannot find the directory.
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@retval EFI_NO_MEDIA The device has no media.
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@retval EFI_DEVICE_ERROR The device reported an error.
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@retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
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@return Others status of FileHandleGetInfo, FileHandleSetPosition,
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or FileHandleRead
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**/
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EFI_STATUS
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EFIAPI
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FileHandleFindFirstFile (
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IN EFI_FILE_HANDLE DirHandle,
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OUT EFI_FILE_INFO **Buffer
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);
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/**
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Retrieves the next file in a directory.
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To use this function, caller must call the FileHandleFindFirstFile() to get the
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first file, and then use this function get other files. This function can be
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called for several times to get each file's information in the directory. If
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the call of FileHandleFindNextFile() got the last file in the directory, the next
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call of this function has no file to get. *NoFile will be set to TRUE and the
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Buffer memory will be automatically freed.
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@param DirHandle the file handle of the directory
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@param Buffer pointer to buffer for file's information
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@param NoFile pointer to boolean when last file is found
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@retval EFI_SUCCESS Found the next file, or reached last file
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@retval EFI_NO_MEDIA The device has no media.
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@retval EFI_DEVICE_ERROR The device reported an error.
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@retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
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**/
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EFI_STATUS
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EFIAPI
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FileHandleFindNextFile(
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IN EFI_FILE_HANDLE DirHandle,
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OUT EFI_FILE_INFO *Buffer,
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OUT BOOLEAN *NoFile
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);
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/**
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Retrieve the size of a file.
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if FileHandle is NULL then ASSERT()
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if Size is NULL then ASSERT()
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This function extracts the file size info from the FileHandle's EFI_FILE_INFO
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data.
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@param FileHandle file handle from which size is retrieved
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@param Size pointer to size
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@retval EFI_SUCCESS operation was completed sucessfully
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@retval EFI_DEVICE_ERROR cannot access the file
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**/
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EFI_STATUS
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EFIAPI
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FileHandleGetSize (
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IN EFI_FILE_HANDLE FileHandle,
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OUT UINT64 *Size
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);
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/**
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Function to get a full filename given a EFI_FILE_HANDLE somewhere lower on the
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directory 'stack'.
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if Handle is NULL, return EFI_INVALID_PARAMETER
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@param[in] Handle Handle to the Directory or File to create path to.
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@param[out] FullFileName pointer to pointer to generated full file name. It
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is the responsibility of the caller to free this memory
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with a call to FreePool().
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@retval EFI_SUCCESS the operation was sucessful and the FullFileName is valid.
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@retval EFI_INVALID_PARAMETER Handle was NULL.
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@retval EFI_INVALID_PARAMETER FullFileName was NULL.
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@retval EFI_OUT_OF_MEMORY a memory allocation failed.
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**/
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EFI_STATUS
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EFIAPI
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FileHandleGetFileName (
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IN CONST EFI_FILE_HANDLE Handle,
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OUT CHAR16 **FullFileName
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);
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/**
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Function to read a single line (up to but not including the \n) from a file.
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@param[in] Handle FileHandle to read from
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@param[in,out] Buffer pointer to buffer to read into
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@param[in,out] Size pointer to number of bytes in buffer
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@param[in[ Truncate if TRUE then allows for truncation of the line to fit.
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if FALSE will reset the position to the begining of the
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line if the buffer is not large enough.
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@retval EFI_SUCCESS the operation was sucessful. the line is stored in
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Buffer. (Size was NOT updated)
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@retval EFI_INVALID_PARAMETER Handle was NULL.
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@retval EFI_INVALID_PARAMETER Buffer was NULL.
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@retval EFI_INVALID_PARAMETER Size was NULL.
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@retval EFI_BUFFER_TOO_SMALL Size was not enough space to store the line.
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Size was updated to minimum space required.
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@sa FileHandleRead
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**/
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EFI_STATUS
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EFIAPI
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FileHandleReadLine(
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IN EFI_FILE_HANDLE Handle,
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IN OUT VOID *Buffer,
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IN OUT UINTN *Size,
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IN BOOLEAN Truncate
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);
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/**
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function to write a line of unicode text to a file.
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if Handle is NULL, ASSERT.
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if Buffer is NULL, do nothing. (return SUCCESS)
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@param[in] Handle FileHandle to write to
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@param[in] Buffer Buffer to write
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@retval EFI_SUCCESS the data was written.
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@retval other failure.
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@sa FileHandleWrite
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**/
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EFI_STATUS
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EFIAPI
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FileHandleWriteLine(
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IN EFI_FILE_HANDLE Handle,
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IN CHAR16 *Buffer
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); |