public SIContentROM(SIROM aImage)
: base(aImage)
{
SIHeaderROM header = (SIHeaderROM)aImage.Header;
base.RelocationAddress = header.RomBaseAddress;
}
public static bool IsROM(Stream aStream)
{
bool ret = false;
//
try
{
ret = SIHeaderROM.IsROM(aStream);
}
catch (Exception)
{
}
//
return(ret);
}
public SIROM(ITracer aTracer, Stream aStream, string aName)
: base(aTracer, new SIStream(aStream), aName)
{
base.Trace("[SymbianImageROM] Ctor() - START");
// Read the header and set base class relocation address
iHeader = new SIHeaderROM(this, aStream);
// We treat ourselves as one giant blob
SIContentROM file = new SIContentROM(this);
base.RegisterFile(file);
base.Trace("[SymbianImageROM] Ctor() - END");
}
private void DoDecompressBytePair()
{
if (iContentIsPrepared == false)
{
SIHeaderROM imageHeader = ImageHeader;
base.Trace("[SymbianImageROM] DoDecompressBytePair() - START - header uncompressed rom size: {0}", imageHeader.UncompressedRomSize);
// Create new buffer and copy over rom image header
SIMemoryStream resultantDataStream = new SIMemoryStream(imageHeader.UncompressedRomSize);
int numPages = imageHeader.NumberOfPages;
uint pageTableOffset = imageHeader.RomPageIndexOffset;
uint romDataOffset = imageHeader.HeaderSizeLoader;
base.Trace("[SymbianImageROM] DoDecompressBytePair() - numPages: {0}, pageTableOffset: {1}, romDataOffset: {2}", numPages, pageTableOffset, romDataOffset);
//
SymbianDecompressor decompressor = SymbianDecompressor.NewByType(TSymbianCompressionType.EBytePair);
//
List <SRomPageInfo> pages = new List <SRomPageInfo>(numPages + 1);
for (int i = 0; i < numPages; i++)
{
// Read a page table entry
long pageOffsetWithinFile = pageTableOffset + (i * SRomPageInfo.Size);
//base.Trace( "[SymbianImageROM] DoDecompressBytePair() - page[{0:d5}] - pageOffsetWithinFile: {1}", i, pageOffsetWithinFile );
base.ImageStream.Seek(pageOffsetWithinFile, SeekOrigin.Begin);
SRomPageInfo pageInfo = SRomPageInfo.New((Stream)base.ImageStream, romDataOffset);
// Process the entry based upon the compression type
//base.Trace( "[SymbianImageROM] DoDecompressBytePair() - page[{0:d5}] - pageInfo.DataSize: {1}, pageInfo.DataStart: {2}, pageInfo.CompressionType: {3}", i, pageInfo.DataSize, pageInfo.DataStart, pageInfo.CompressionType );
base.ImageStream.Seek(pageInfo.DataStart, SeekOrigin.Begin);
if (pageInfo.CompressionType == SRomPageInfo.TSymbianCompressionType.ENoCompression)
{
// Read data - no decompression needed
//base.Trace( "[SymbianImageROM] DoDecompressBytePair() - page[{0:d5}] - PAGE NOT COMPRESSED", i );
resultantDataStream.Write(base.ImageStream, (int)pageInfo.DataSize);
}
else if (pageInfo.CompressionType == SRomPageInfo.TSymbianCompressionType.EBytePair)
{
//base.Trace( "[SymbianImageROM] DoDecompressBytePair() - page[{0:d5}] - BYTE PAIR PAGE", i );
// Read data - need to decompress it
byte[] compressedData = new byte[pageInfo.DataSize];
base.ImageStream.Read(compressedData, 0, compressedData.Length);
// Make destination buffer - which is a page big
byte[] uncompressedData = new byte[SRomPageInfo.KPageSize];
// Decompress to buffer - we're handling the page management, so we want raw decompression
int error = decompressor.DecompressRaw(compressedData, uncompressedData);
// Save it
if (error < 0)
{
base.Trace("[SymbianImageROM] DoDecompressBytePair() - page[{0:d5}] - Exception - bytepair decompression error", i);
throw new Exception("BytePair decompression error: " + error.ToString());
}
else if (error != SRomPageInfo.KPageSize)
{
base.Trace("[SymbianImageROM] DoDecompressBytePair() - page[{0:d5}] - Exception - bytepair underflow error", i);
throw new Exception("Decompressor underflow - only created " + error.ToString() + " bytes");
}
else
{
resultantDataStream.Write(uncompressedData);
}
}
else
{
base.Trace("[SymbianImageROM] DoDecompressBytePair() - page[{0:d5}] - UNSUPPORTED COMPRESSION TYPE - Exception!", i);
throw new NotSupportedException("Unsupported page compression type");
}
// Report progress
base.ReportDecompressionEvent(TDecompressionEvent.EEventDecompressionProgress, ((float)i / (float)numPages) * 100);
}
// Now we can replace the base class stream (which is just the raw compressed file data) with the new uncompressed version
base.ImageStream = resultantDataStream;
iContentIsPrepared = true;
base.Trace("[SymbianImageROM] DoDecompressBytePair() - END");
}
}
