diff options
Diffstat (limited to 'ShellPkg/Library/UefiShellDebug1CommandsLib/Comp.c')
| -rw-r--r-- | ShellPkg/Library/UefiShellDebug1CommandsLib/Comp.c | 127 |
1 files changed, 124 insertions, 3 deletions
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Comp.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/Comp.c index 0a5d13f01c..0df0b31493 100644 --- a/ShellPkg/Library/UefiShellDebug1CommandsLib/Comp.c +++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Comp.c @@ -21,6 +21,16 @@ typedef enum { InPrevDiffPoint
} READ_STATUS;
+//
+// Buffer type, for reading both file operands in chunks.
+//
+typedef struct {
+ UINT8 *Data; // dynamically allocated buffer
+ UINTN Allocated; // the allocated size of Data
+ UINTN Next; // next position in Data to fetch a byte at
+ UINTN Left; // number of bytes left in Data for fetching at Next
+} FILE_BUFFER;
+
/**
Function to print differnt point data.
@@ -77,6 +87,106 @@ PrintDifferentPoint( }
/**
+ Initialize a FILE_BUFFER.
+
+ @param[out] FileBuffer The FILE_BUFFER to initialize. On return, the caller
+ is responsible for checking FileBuffer->Data: if
+ FileBuffer->Data is NULL on output, then memory
+ allocation failed.
+**/
+STATIC
+VOID
+FileBufferInit (
+ OUT FILE_BUFFER *FileBuffer
+ )
+{
+ FileBuffer->Allocated = PcdGet32 (PcdShellFileOperationSize);
+ FileBuffer->Data = AllocatePool (FileBuffer->Allocated);
+ FileBuffer->Left = 0;
+}
+
+/**
+ Uninitialize a FILE_BUFFER.
+
+ @param[in,out] FileBuffer The FILE_BUFFER to uninitialize. The caller is
+ responsible for making sure FileBuffer was first
+ initialized with FileBufferInit(), successfully or
+ unsuccessfully.
+**/
+STATIC
+VOID
+FileBufferUninit (
+ IN OUT FILE_BUFFER *FileBuffer
+ )
+{
+ SHELL_FREE_NON_NULL (FileBuffer->Data);
+}
+
+/**
+ Read a byte from a SHELL_FILE_HANDLE, buffered with a FILE_BUFFER.
+
+ @param[in] FileHandle The SHELL_FILE_HANDLE to replenish FileBuffer
+ from, if needed.
+
+ @param[in,out] FileBuffer The FILE_BUFFER to read a byte from. If FileBuffer
+ is empty on entry, then FileBuffer is refilled
+ from FileHandle, before outputting a byte from
+ FileBuffer to Byte. The caller is responsible for
+ ensuring that FileBuffer was successfully
+ initialized with FileBufferInit().
+
+ @param[out] BytesRead On successful return, BytesRead is set to 1 if the
+ next byte from FileBuffer has been stored to Byte.
+ On successful return, BytesRead is set to 0 if
+ FileBuffer is empty, and FileHandle is at EOF.
+ When an error is returned, BytesRead is not set.
+
+ @param[out] Byte On output, the next byte from FileBuffer. Only set
+ if (a) EFI_SUCCESS is returned and (b) BytesRead
+ is set to 1 on output.
+
+ @retval EFI_SUCCESS BytesRead has been set to 0 or 1. In the latter case,
+ Byte has been set as well.
+
+ @return Error codes propagated from
+ gEfiShellProtocol->ReadFile().
+**/
+STATIC
+EFI_STATUS
+FileBufferReadByte (
+ IN SHELL_FILE_HANDLE FileHandle,
+ IN OUT FILE_BUFFER *FileBuffer,
+ OUT UINTN *BytesRead,
+ OUT UINT8 *Byte
+ )
+{
+ UINTN ReadSize;
+ EFI_STATUS Status;
+
+ if (FileBuffer->Left == 0) {
+ ReadSize = FileBuffer->Allocated;
+ Status = gEfiShellProtocol->ReadFile (FileHandle, &ReadSize,
+ FileBuffer->Data);
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+ if (ReadSize == 0) {
+ *BytesRead = 0;
+ return EFI_SUCCESS;
+ }
+ FileBuffer->Next = 0;
+ FileBuffer->Left = ReadSize;
+ }
+
+ *BytesRead = 1;
+ *Byte = FileBuffer->Data[FileBuffer->Next];
+
+ FileBuffer->Next++;
+ FileBuffer->Left--;
+ return EFI_SUCCESS;
+}
+
+/**
Function for 'comp' command.
@param[in] ImageHandle Handle to the Image (NULL if Internal).
@@ -107,6 +217,8 @@ ShellCommandRunComp ( UINT8 OneByteFromFile2;
UINT8 *DataFromFile1;
UINT8 *DataFromFile2;
+ FILE_BUFFER FileBuffer1;
+ FILE_BUFFER FileBuffer2;
UINTN InsertPosition1;
UINTN InsertPosition2;
UINTN DataSizeFromFile1;
@@ -234,10 +346,15 @@ ShellCommandRunComp ( if (ShellStatus == SHELL_SUCCESS) {
DataFromFile1 = AllocateZeroPool ((UINTN)DifferentBytes);
DataFromFile2 = AllocateZeroPool ((UINTN)DifferentBytes);
- if (DataFromFile1 == NULL || DataFromFile2 == NULL) {
+ FileBufferInit (&FileBuffer1);
+ FileBufferInit (&FileBuffer2);
+ if (DataFromFile1 == NULL || DataFromFile2 == NULL ||
+ FileBuffer1.Data == NULL || FileBuffer2.Data == NULL) {
ShellStatus = SHELL_OUT_OF_RESOURCES;
SHELL_FREE_NON_NULL (DataFromFile1);
SHELL_FREE_NON_NULL (DataFromFile2);
+ FileBufferUninit (&FileBuffer1);
+ FileBufferUninit (&FileBuffer2);
}
}
@@ -247,9 +364,11 @@ ShellCommandRunComp ( DataSizeFromFile2 = 1;
OneByteFromFile1 = 0;
OneByteFromFile2 = 0;
- Status = gEfiShellProtocol->ReadFile (FileHandle1, &DataSizeFromFile1, &OneByteFromFile1);
+ Status = FileBufferReadByte (FileHandle1, &FileBuffer1,
+ &DataSizeFromFile1, &OneByteFromFile1);
ASSERT_EFI_ERROR (Status);
- Status = gEfiShellProtocol->ReadFile (FileHandle2, &DataSizeFromFile2, &OneByteFromFile2);
+ Status = FileBufferReadByte (FileHandle2, &FileBuffer2,
+ &DataSizeFromFile2, &OneByteFromFile2);
ASSERT_EFI_ERROR (Status);
TempAddress++;
@@ -346,6 +465,8 @@ ShellCommandRunComp ( SHELL_FREE_NON_NULL (DataFromFile1);
SHELL_FREE_NON_NULL (DataFromFile2);
+ FileBufferUninit (&FileBuffer1);
+ FileBufferUninit (&FileBuffer2);
if (DiffPointNumber == 0) {
ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_COMP_FOOTER_PASS), gShellDebug1HiiHandle);
|