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/** @file
This contains some useful functions for accessing files.
Copyright (c) 2004 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <assert.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include "CommonLib.h"
#include "MemoryFile.h"
//
// Local (static) function prototypes
//
STATIC
VOID
CheckMemoryFileState (
IN EFI_HANDLE InputMemoryFile
);
//
// Function implementations
//
EFI_STATUS
GetMemoryFile (
IN CHAR8 *InputFileName,
OUT EFI_HANDLE *OutputMemoryFile
)
/*++
Routine Description:
This opens a file, reads it into memory and returns a memory file
object.
Arguments:
InputFile Memory file image.
OutputMemoryFile Handle to memory file
Returns:
EFI_STATUS
OutputMemoryFile is valid if !EFI_ERROR
--*/
{
EFI_STATUS Status;
CHAR8 *InputFileImage;
UINT32 BytesRead;
MEMORY_FILE *NewMemoryFile;
Status = GetFileImage (InputFileName, &InputFileImage, &BytesRead);
if (EFI_ERROR (Status)) {
return Status;
}
NewMemoryFile = malloc (sizeof (*NewMemoryFile));
if (NewMemoryFile == NULL) {
free (InputFileImage);
return EFI_OUT_OF_RESOURCES;
}
NewMemoryFile->FileImage = InputFileImage;
NewMemoryFile->CurrentFilePointer = InputFileImage;
NewMemoryFile->Eof = InputFileImage + BytesRead;
*OutputMemoryFile = (EFI_HANDLE)NewMemoryFile;
CheckMemoryFileState (*OutputMemoryFile);
return EFI_SUCCESS;
}
EFI_STATUS
FreeMemoryFile (
IN EFI_HANDLE InputMemoryFile
)
/*++
Routine Description:
Frees all memory associated with the input memory file.
Arguments:
InputMemoryFile Handle to memory file
Returns:
EFI_STATUS
--*/
{
MEMORY_FILE *MemoryFile;
CheckMemoryFileState (InputMemoryFile);
MemoryFile = (MEMORY_FILE*)InputMemoryFile;
free (MemoryFile->FileImage);
//
// Invalidate state of MEMORY_FILE structure to catch invalid usage.
//
memset (MemoryFile, 0xcc, sizeof (*MemoryFile));
MemoryFile->Eof -= 1;
free (MemoryFile);
return EFI_SUCCESS;
}
CHAR8 *
ReadMemoryFileLine (
IN EFI_HANDLE InputMemoryFile
)
/*++
Routine Description:
This function reads a line from the memory file. The newline characters
are stripped and a null terminated string is returned.
If the string pointer returned is non-NULL, then the caller must free the
memory associated with this string.
Arguments:
InputMemoryFile Handle to memory file
Returns:
NULL if error or EOF
NULL character termincated string otherwise (MUST BE FREED BY CALLER)
--*/
{
CHAR8 *EndOfLine;
UINTN CharsToCopy;
MEMORY_FILE *InputFile;
UINTN BytesToEof;
CHAR8 *OutputString;
//
// Verify input parameters are not null
//
CheckMemoryFileState (InputMemoryFile);
InputFile = (MEMORY_FILE*)InputMemoryFile;
//
// Check for end of file condition
//
if (InputFile->CurrentFilePointer >= InputFile->Eof) {
return NULL;
}
//
// Determine the number of bytes remaining until the EOF
//
BytesToEof = InputFile->Eof - InputFile->CurrentFilePointer;
//
// Find the next newline char
//
EndOfLine = memchr (InputFile->CurrentFilePointer, '\n', BytesToEof);
//
// Determine the number of characters to copy.
//
if (EndOfLine == 0) {
//
// If no newline found, copy to the end of the file.
//
CharsToCopy = InputFile->Eof - InputFile->CurrentFilePointer;
} else {
//
// Newline found in the file.
//
CharsToCopy = EndOfLine - InputFile->CurrentFilePointer;
}
OutputString = malloc (CharsToCopy + 1);
if (OutputString == NULL) {
return NULL;
}
//
// Copy the line.
//
memcpy (OutputString, InputFile->CurrentFilePointer, CharsToCopy);
//
// Add the null termination over the 0x0D
//
if (OutputString[CharsToCopy - 1] == '\r') {
OutputString[CharsToCopy - 1] = '\0';
} else {
OutputString[CharsToCopy] = '\0';
}
//
// Increment the current file pointer (include the 0x0A)
//
InputFile->CurrentFilePointer += CharsToCopy + 1;
if (InputFile->CurrentFilePointer > InputFile->Eof) {
InputFile->CurrentFilePointer = InputFile->Eof;
}
CheckMemoryFileState (InputMemoryFile);
//
// Return the string
//
return OutputString;
}
STATIC
VOID
CheckMemoryFileState (
IN EFI_HANDLE InputMemoryFile
)
{
MEMORY_FILE *MemoryFile;
assert (InputMemoryFile != NULL);
MemoryFile = (MEMORY_FILE*)InputMemoryFile;
assert (MemoryFile->FileImage != NULL);
assert (MemoryFile->CurrentFilePointer != NULL);
assert (MemoryFile->Eof != NULL);
assert (MemoryFile->Eof >= MemoryFile->FileImage);
assert (MemoryFile->CurrentFilePointer >= MemoryFile->FileImage);
assert (MemoryFile->CurrentFilePointer <= MemoryFile->Eof);
}
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