diff options
Diffstat (limited to 'ArmPlatformPkg/FileSystem/BootMonFs/BootMonFsReadWrite.c')
| -rw-r--r-- | ArmPlatformPkg/FileSystem/BootMonFs/BootMonFsReadWrite.c | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/ArmPlatformPkg/FileSystem/BootMonFs/BootMonFsReadWrite.c b/ArmPlatformPkg/FileSystem/BootMonFs/BootMonFsReadWrite.c index 653b2c507..358332d65 100644 --- a/ArmPlatformPkg/FileSystem/BootMonFs/BootMonFsReadWrite.c +++ b/ArmPlatformPkg/FileSystem/BootMonFs/BootMonFsReadWrite.c @@ -20,6 +20,23 @@ #include "BootMonFsInternal.h"
+/**
+ Read data from an open file.
+
+ @param[in] This A pointer to the EFI_FILE_PROTOCOL instance that
+ is the file handle to read data from.
+ @param[in out] BufferSize On input, the size of the Buffer. On output, the
+ amount of data returned in Buffer. In both cases,
+ the size is measured in bytes.
+ @param[out] Buffer The buffer into which the data is read.
+
+ @retval EFI_SUCCESS The data was read.
+ @retval EFI_DEVICE_ERROR On entry, the current file position is
+ beyond the end of the file, or the device
+ reported an error while performing the read
+ operation.
+ @retval EFI_INVALID_PARAMETER At least one of the parameters is invalid.
+**/
EFIAPI
EFI_STATUS
BootMonFsReadFile (
@@ -51,9 +68,14 @@ BootMonFsReadFile ( FileStart = (Media->LowestAlignedLba + File->HwDescription.BlockStart) * Media->BlockSize;
if (File->Position >= File->HwDescription.Region[0].Size) {
- // The entire file has been read
+ // The entire file has been read or the position has been
+ // set past the end of the file.
*BufferSize = 0;
- return EFI_DEVICE_ERROR;
+ if (File->Position > File->HwDescription.Region[0].Size) {
+ return EFI_DEVICE_ERROR;
+ } else {
+ return EFI_SUCCESS;
+ }
}
// This driver assumes that the entire file is in region 0.
|