public static void ExportCFFMemorySegments(string filePath)
{
string directory = Path.GetDirectoryName(filePath);
Console.WriteLine($"Starting CFF segment export. Assumes that segments are embedded and unprotected.");
byte[] flashContainer = File.ReadAllBytes(filePath);
CaesarFlashContainer container = new CaesarFlashContainer(flashContainer);
using (BinaryReader reader = new BinaryReader(new MemoryStream(flashContainer)))
{
foreach (FlashDataBlock db in container.CaesarFlashHeader.DataBlocks)
{
Console.WriteLine($"FlashDataBlock: {db.Qualifier}");
long fileCursor = 0;
foreach (FlashSegment seg in db.FlashSegments)
{
long offset =
db.FlashData +
container.CaesarFlashHeader.CffHeaderSize +
container.CaesarFlashHeader.LanguageBlockLength +
fileCursor +
0x414;
fileCursor += seg.SegmentLength;
Console.WriteLine($"Segment: {seg.SegmentName} mapped to 0x{seg.FromAddress:X} with size 0x{seg.SegmentLength:X}");
reader.BaseStream.Seek(offset, SeekOrigin.Begin);
byte[] fileBytes = reader.ReadBytes(seg.SegmentLength);
File.WriteAllBytes($"{directory}\\{db.Qualifier}_{seg.FromAddress:X}.bin", fileBytes);
}
}
}
Console.WriteLine($"Exported segments can be found at {directory}");
}
public static void ExportCFFMemorySegments(string filePath)
{
string directory = Path.GetDirectoryName(filePath);
Console.WriteLine($"Starting CFF segment export. Assumes that segments are embedded and unprotected.");
byte[] flashContainer = File.ReadAllBytes(filePath);
CaesarFlashContainer container = new CaesarFlashContainer(flashContainer);
// mini-feature: if a binary with enough space exists, the image's data will be written to it (for some CFFs with many segments, this saves time)
string mergePath = @"merge.bin";
bool useMergeFeature = File.Exists(mergePath);
byte[] mergeBytes = new byte[] { };
if (useMergeFeature)
{
mergeBytes = File.ReadAllBytes(mergePath);
}
using (BinaryReader reader = new BinaryReader(new MemoryStream(flashContainer)))
{
foreach (FlashDataBlock db in container.CaesarFlashHeader.DataBlocks)
{
Console.WriteLine($"FlashDataBlock: {db.Qualifier}");
long fileCursor = 0;
foreach (FlashSegment seg in db.FlashSegments)
{
long offset =
db.FlashData +
container.CaesarFlashHeader.CffHeaderSize +
container.CaesarFlashHeader.LanguageBlockLength +
fileCursor +
0x414;
fileCursor += seg.SegmentLength;
Console.WriteLine($"Segment: {seg.SegmentName} mapped to 0x{seg.FromAddress:X} with size 0x{seg.SegmentLength:X}");
reader.BaseStream.Seek(offset, SeekOrigin.Begin);
byte[] fileBytes = reader.ReadBytes(seg.SegmentLength);
File.WriteAllBytes($"{directory}\\{db.Qualifier}_{seg.FromAddress:X}.bin", fileBytes);
if (useMergeFeature && (mergeBytes.Length >= (seg.FromAddress + fileBytes.Length)))
{
for (int i = 0; i < fileBytes.Length; i++)
{
mergeBytes[i + seg.FromAddress] |= fileBytes[i];
}
}
}
}
}
Console.WriteLine($"Exported segments can be found at {directory}");
if (useMergeFeature)
{
File.WriteAllBytes(mergePath, mergeBytes);
}
}
public void SpliceCFFFile(string filePath)
{
string directory = Path.GetDirectoryName(filePath);
Console.WriteLine($"Starting CFF splicer..");
byte[] flashContainer = File.ReadAllBytes(filePath);
CaesarFlashContainer container = new CaesarFlashContainer(flashContainer);
using (BinaryReader reader = new BinaryReader(new MemoryStream(flashContainer)))
{
foreach (FlashDataBlock db in container.CaesarFlashHeader.DataBlocks)
{
Console.WriteLine($"FlashDataBlock: {db.Qualifier}");
long fileCursor = 0;
foreach (FlashSegment seg in db.FlashSegments)
{
// check: which fields are mutable when splicing
long offset =
db.FlashData + // somewhat mutable : probably if there's more than 1 datablock, this value will be nonzero
container.CaesarFlashHeader.CffHeaderSize + // constant
container.CaesarFlashHeader.LanguageBlockLength + // constant
fileCursor + // mutable, see below
0x414; // constant
fileCursor += seg.SegmentLength; // mutable because of segment length
Console.WriteLine($"Segment: {seg.SegmentName} mapped to 0x{seg.FromAddress:X} with size 0x{seg.SegmentLength:X}");
reader.BaseStream.Seek(offset, SeekOrigin.Begin);
byte[] fileBytes = reader.ReadBytes(seg.SegmentLength);
File.WriteAllBytes($"{directory}\\{db.Qualifier}_{seg.FromAddress:X}.bin", fileBytes);
}
}
}
Console.WriteLine($"Exported segments can be found at {directory}");
}
