private static Stream ReadPackage(Stream input)
{
var magic = input.ReadValueU32(Endian.Little);
if (magic != 0x9E2A83C1 &&
magic.Swap() != 0x9E2A83C1)
{
throw new FormatException("not a package");
}
var endian = magic == 0x9E2A83C1
? Endian.Little
: Endian.Big;
var versionLo = input.ReadValueU16(endian);
var versionHi = input.ReadValueU16(endian);
if (versionLo != 684 &&
versionHi != 194)
{
throw new FormatException("unsupported version");
}
input.Seek(4, SeekOrigin.Current);
var folderNameLength = input.ReadValueS32(endian);
var folderNameByteLength =
folderNameLength >= 0 ? folderNameLength : (-folderNameLength * 2);
input.Seek(folderNameByteLength, SeekOrigin.Current);
/*var packageFlagsOffset = input.Position;*/
var packageFlags = input.ReadValueU32(endian);
if ((packageFlags & 8) != 0)
{
input.Seek(4, SeekOrigin.Current);
}
input.Seek(24, SeekOrigin.Current);
if ((packageFlags & 0x02000000) == 0)
{
return input;
}
input.Seek(36, SeekOrigin.Current);
var generationsCount = input.ReadValueU32(endian);
input.Seek(generationsCount * 12, SeekOrigin.Current);
input.Seek(20, SeekOrigin.Current);
var blockCount = input.ReadValueU32(endian);
var blockStream = new BlockStream(input);
for (int i = 0; i < blockCount; i++)
{
var uncompressedOffset = input.ReadValueU32(endian);
var uncompressedSize = input.ReadValueU32(endian);
var compressedOffset = input.ReadValueU32(endian);
var compressedSize = input.ReadValueU32(endian);
blockStream.AddBlock(
uncompressedOffset,
uncompressedSize,
compressedOffset,
compressedSize);
}
return blockStream;
}
private static Stream ReadPackage(Stream input)
{
var magic = input.ReadValueU32(Endian.Little);
if (magic != 0x9E2A83C1 &&
magic.Swap() != 0x9E2A83C1)
{
throw new FormatException("not a package");
}
var endian = magic == 0x9E2A83C1
? Endian.Little
: Endian.Big;
var versionLo = input.ReadValueU16(endian);
var versionHi = input.ReadValueU16(endian);
if (versionLo != 684 &&
versionHi != 194)
{
throw new FormatException("unsupported version");
}
input.Seek(4, SeekOrigin.Current);
var folderNameLength = input.ReadValueS32(endian);
var folderNameByteLength =
folderNameLength >= 0 ? folderNameLength : (-folderNameLength * 2);
input.Seek(folderNameByteLength, SeekOrigin.Current);
/*var packageFlagsOffset = input.Position;*/
var packageFlags = input.ReadValueU32(endian);
if ((packageFlags & 8) != 0)
{
input.Seek(4, SeekOrigin.Current);
}
input.Seek(24, SeekOrigin.Current);
if ((packageFlags & 0x02000000) == 0)
{
return(input);
}
input.Seek(36, SeekOrigin.Current);
var generationsCount = input.ReadValueU32(endian);
input.Seek(generationsCount * 12, SeekOrigin.Current);
input.Seek(20, SeekOrigin.Current);
var blockCount = input.ReadValueU32(endian);
var blockStream = new BlockStream(input);
for (int i = 0; i < blockCount; i++)
{
var uncompressedOffset = input.ReadValueU32(endian);
var uncompressedSize = input.ReadValueU32(endian);
var compressedOffset = input.ReadValueU32(endian);
var compressedSize = input.ReadValueU32(endian);
blockStream.AddBlock(
uncompressedOffset,
uncompressedSize,
compressedOffset,
compressedSize);
}
return(blockStream);
}
