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502 lines
19 KiB
C
502 lines
19 KiB
C
/** @file
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Provides interface to EFI_FILE_HANDLE functionality.
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Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef _FILE_HANDLE_LIBRARY_HEADER_
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#define _FILE_HANDLE_LIBRARY_HEADER_
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#include <Protocol/SimpleFileSystem.h>
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#include <Guid/FileInfo.h>
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/// The tag for use in identifying UNICODE files.
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/// If the file is UNICODE, the first 16 bits of the file will equal this value.
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extern CONST UINT16 gUnicodeFileTag;
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/**
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This function retrieves information about the file for the handle
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specified and stores it in the 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[in] 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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@retval !NULL 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 sets the information about the file for the opened handle
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specified.
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@param[in] FileHandle The file handle of the file for which information
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is being set.
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@param[in] FileInfo The information to set.
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@retval EFI_SUCCESS The information was set.
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@retval EFI_INVALID_PARAMETER A parameter was out of range or invalid.
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@retval EFI_UNSUPPORTED The FileHandle does not support FileInfo.
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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[in] FileHandle The opened file handle.
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@param[in, out] 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[out] 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[in] FileHandle The opened file for writing.
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@param[in, out] 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[in] 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 opened 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[in] FileHandle The file handle to close.
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@retval EFI_SUCCESS The file handle was closed successfully.
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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[in] FileHandle The file handle to delete.
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@retval EFI_SUCCESS The file was closed successfully.
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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 moving to position 0xFFFFFFFFFFFFFFFF, only
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absolute positioning is supported, and moving past the end of the file is
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allowed (a subsequent write would grow the file). Moving 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 again.
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@param[in] FileHandle The file handle on which the position is being set.
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@param[in] Position The byte position from the beginning of the file.
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@retval EFI_SUCCESS The operation completed successfully.
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@retval EFI_UNSUPPORTED The 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. 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[in] FileHandle The open file handle on which to get the position.
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@param[out] Position The byte position from beginning of file.
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@retval EFI_SUCCESS The operation completed successfully.
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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[in] 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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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[in] 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 is NULL.
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The file information returns from FileHandleGetInfo is NULL.
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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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/** Retrieve first entry from a directory.
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This function takes an open directory handle and gets information from the
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first entry in the directory. A buffer is allocated to contain
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the information and a pointer to the buffer is returned in *Buffer. The
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caller can use FileHandleFindNextFile() to get subsequent directory entries.
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The buffer will be freed by FileHandleFindNextFile() when the last directory
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entry is read. Otherwise, the caller must free the buffer, using FreePool,
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when finished with it.
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@param[in] DirHandle The file handle of the directory to search.
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@param[out] Buffer The 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 The 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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/** Retrieve next entries from a directory.
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To use this function, the caller must first call the FileHandleFindFirstFile()
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function to get the first directory entry. Subsequent directory entries are
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retrieved by using the FileHandleFindNextFile() function. This function can
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be called several times to get each entry from the directory. If the call of
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FileHandleFindNextFile() retrieved the last directory entry, the next call of
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this function will set *NoFile to TRUE and free the buffer.
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@param[in] DirHandle The file handle of the directory.
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@param[out] Buffer The pointer to buffer for file's information.
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@param[out] NoFile The 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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This function extracts the file size info from the FileHandle's EFI_FILE_INFO
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data.
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@param[in] FileHandle The file handle from which size is retrieved.
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@param[out] Size The pointer to size.
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@retval EFI_SUCCESS Operation was completed successfully.
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@retval EFI_DEVICE_ERROR Cannot access the file.
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@retval EFI_INVALID_PARAMETER FileHandle is NULL.
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Size is NULL.
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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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Set the size of a file.
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This function changes the file size info from the FileHandle's EFI_FILE_INFO
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data.
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@param[in] FileHandle The file handle whose size is to be changed.
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@param[in] Size The new size.
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@retval EFI_SUCCESS The operation completed successfully.
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@retval EFI_DEVICE_ERROR Cannot access the file.
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@retval EFI_INVALID_PARAMETER FileHandle is NULL.
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**/
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EFI_STATUS
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EFIAPI
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FileHandleSetSize (
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IN EFI_FILE_HANDLE FileHandle,
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IN 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'. If the file is a directory, then append the '\' char at the
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end of name string. If it's not a directory, then the last '\' should not be
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added.
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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 successful and 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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If the position upon start is 0, then the Ascii Boolean will be set. This should be
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maintained and not changed for all operations with the same file.
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The function will not return the \r and \n character in buffer. When an empty line is
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read a CHAR_NULL character will be returned in buffer.
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@param[in] Handle FileHandle to read from.
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@param[in, out] Buffer The pointer to buffer to read into.
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@param[in, out] Size The pointer to number of bytes in Buffer.
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@param[in] Truncate If the buffer is large enough, this has no effect.
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If the buffer is is too small and Truncate is TRUE,
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the line will be truncated.
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If the buffer is is too small and Truncate is FALSE,
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then no read will occur.
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@param[in, out] Ascii Boolean value for indicating whether the file is
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Ascii (TRUE) or UCS2 (FALSE).
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@retval EFI_SUCCESS The operation was successful. The line is stored in
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Buffer.
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@retval EFI_INVALID_PARAMETER Handle 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 large enough to store the line.
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Size was updated to the 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 CHAR16 *Buffer,
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IN OUT UINTN *Size,
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IN BOOLEAN Truncate,
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IN OUT BOOLEAN *Ascii
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);
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/**
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Function to read a single line from a file. The \n is not included in the returned
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buffer. The returned buffer must be callee freed.
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If the position upon start is 0, then the Ascii Boolean will be set. This should be
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maintained and not changed for all operations with the same file.
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@param[in] Handle FileHandle to read from.
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@param[in, out] Ascii Boolean value for indicating whether the file is
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Ascii (TRUE) or UCS2 (FALSE).
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@return The line of text from the file.
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@sa FileHandleReadLine
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**/
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CHAR16*
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EFIAPI
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FileHandleReturnLine(
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IN EFI_FILE_HANDLE Handle,
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IN OUT BOOLEAN *Ascii
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);
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/**
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Function to write a line of text to a file.
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If the file is a Unicode file (with UNICODE file tag) then write the unicode
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text.
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If the file is an ASCII file then write the ASCII text.
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If the size of file is zero (without file tag at the beginning) then write
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ASCII text as default.
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@param[in] Handle FileHandle to write to.
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@param[in] Buffer Buffer to write, if NULL the function will
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take no action and return EFI_SUCCESS.
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@retval EFI_SUCCESS The data was written.
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Buffer is NULL.
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@retval EFI_INVALID_PARAMETER Handle is NULL.
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@retval EFI_OUT_OF_RESOURCES Unable to allocate temporary space for ASCII
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string due to out of resources.
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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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);
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/**
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Function to take a formatted argument and print it to a file.
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@param[in] Handle The file handle for the file to write to.
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@param[in] Format The format argument (see printlib for the format specifier).
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@param[in] ... The variable arguments for the format.
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@retval EFI_SUCCESS The operation was successful.
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@retval other A return value from FileHandleWriteLine.
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@sa FileHandleWriteLine
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**/
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EFI_STATUS
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EFIAPI
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FileHandlePrintLine(
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IN EFI_FILE_HANDLE Handle,
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IN CONST CHAR16 *Format,
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...
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);
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/**
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Function to determine if a FILE_HANDLE is at the end of the file.
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This will NOT work on directories.
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If Handle is NULL, then ASSERT().
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@param[in] Handle The file handle.
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@retval TRUE The position is at the end of the file.
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@retval FALSE The position is not at the end of the file.
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**/
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BOOLEAN
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EFIAPI
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FileHandleEof(
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IN EFI_FILE_HANDLE Handle
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);
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#endif //_FILE_HANDLE_LIBRARY_HEADER_
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