/// <summary>Outputs a debug version of a compressed segment</summary>
public static StringBuilder DumpCompressed(Slice compressed, StringBuilder output = null)
{
if (output == null) output = new StringBuilder();
if (compressed.Count == 0)
{
output.Append("Empty bitmap [0 bytes]");
return output;
}
var reader = new SliceReader(compressed);
output.Append(String.Format("Compressed [{0} bytes]:", compressed.Count));
uint header = reader.ReadFixed32();
int highestBit = (int)header;
output.Append(String.Format(" {0} words", (compressed.Count >> 2) - 1));
uint p = 0;
int i = 0;
while(reader.Remaining >= 4)
{
uint word = reader.ReadFixed32();
if ((word & TYPE_MASK) == BIT_TYPE_LITERAL)
{
output.AppendFormat(", ({0}:{1}) 0x{2:X8}", i, p, word);
p += 31;
}
else
{
uint len = (word & LENGTH_MASK) + 1;
output.AppendFormat(", ({0}:{1}) {2} x {3}", i, p, ((word & FILL_MASK) >> FILL_SHIFT) == 0 ? "zero" : "one", len);
p += len * 31;
}
i++;
}
output.Append(", MSB ").Append(highestBit);
if (reader.Remaining > 0)
{
output.AppendLine(String.Format(", ERROR: {0} trailing byte(s)", reader.Remaining));
}
return output;
}
private static void CheckVersion(Slice value, bool writeAccess)
{
// the version is stored as 3 x 32-bit unsigned ints, so (1, 0, 0) will be "<01><00><00><00> <00><00><00><00> <00><00><00><00>"
var reader = new SliceReader(value);
var major = reader.ReadFixed32();
var minor = reader.ReadFixed32();
var upgrade = reader.ReadFixed32();
if (major > LayerVersion.Major) throw new InvalidOperationException(String.Format("Cannot load directory with version {0}.{1}.{2} using directory layer {3}", major, minor, upgrade, LayerVersion));
if (writeAccess && minor > LayerVersion.Minor) throw new InvalidOperationException(String.Format("Directory with version {0}.{1}.{2} is read-only when opened using directory layer {3}", major, minor, upgrade, LayerVersion));
}