private int GetRunLengthValue(BeImageReader a5dr, ref int a5repeat)
{
// Run length returned is in byte(s).
// next byte read - see bit pattern from the following table for the return value
// 0xxxxxxx - 0 - $7F
// 10xxxxxx - 0 - $3FFF(run length and $3F + next byte, 14 bits)
// 110xxxxx - 0 - $1FFFFF(run length and $1F + next two bytes, 21 bits)
// 1110xxxx - next 4 bytes, 32 bits
// 1111xxxx - get both new runtime length copy in bytes and new runtime length repeat count
int runLength = a5dr.ReadByte();
if ((runLength & 0x80) == 0)
{
return(runLength);
}
if ((runLength & 0x40) == 0)
{
runLength = runLength & 0x3F;
runLength = (runLength << 8) + a5dr.ReadByte();
return(runLength);
}
if ((runLength & 0x20) == 0)
{
runLength = runLength & 0x1F;
runLength = (runLength << 16) + a5dr.ReadBeInt16();
return(runLength);
}
if ((runLength & 0x10) == 0)
{
return(a5dr.ReadBeInt32());
}
runLength = GetRunLengthValue(a5dr, ref a5repeat);
a5repeat = GetRunLengthValue(a5dr, ref a5repeat);
return(runLength);
}
public void ParseRelocShort(Action <Hunk> h)
{
var hunk = new RelocHunk();
h(hunk);
var num_relocs = 1;
var reloc = new Dictionary <int, List <uint> >();
hunk.reloc = reloc;
var total_words = 0;
while (num_relocs != 0)
{
num_relocs = this.read_word(f);
if (num_relocs < 0)
{
throw new BadImageFormatException(string.Format("{0} has invalid number of relocations.", hunk.HunkType));
}
else if (num_relocs == 0)
{
// last relocation found
++total_words;
break;
}
// build reloc map
var hunkNo = this.read_word(f);
if (hunkNo < 0)
{
throw new BadImageFormatException(string.Format("{0} has invalid hunk num.", hunk.HunkType));
}
var offsets = new List <uint>();
var count = num_relocs & 0xFFFF;
total_words += count + 2;
for (var a = 0; a < count; ++a)
{
var offset = f.ReadBeInt16();
if (offset < 0)
{
throw new BadImageFormatException(string.Format(
"{0} has invalid relocation #{1} offset {2} (num_relocs={3} hunkNo={4}, offset={5}).", hunk.HunkType, a, offset, num_relocs, hunkNo, f.Offset));
}
offsets.Add((uint)offset);
}
reloc[hunkNo] = offsets;
// padding
}
if ((total_words & 1) == 1)
{
f.ReadBeInt16();
}
}