void LzUnpack(IBinaryStream input, byte[] output)
{
int dst = 0;
int bits = 0;
byte mask = 0;
while (dst < output.Length)
{
mask >>= 1;
if (0 == mask)
{
bits = input.ReadByte();
if (-1 == bits)
{
break;
}
mask = 0x80;
}
if ((mask & bits) != 0)
{
int offset = input.ReadUInt16();
int count = (offset >> 12) + 1;
offset &= 0xFFF;
Binary.CopyOverlapped(output, dst - offset, dst, count);
dst += count;
}
else
{
output[dst++] = input.ReadUInt8();
}
}
}
protected override void ReadArgs(IBinaryStream reader)
{
if (IsOffset)
{
ReadString(reader);
}
else
{
var startOffset = reader.ReadInt32LE() - Offset;
if (startOffset != 10)
{
throw new InvalidDataException($"code [55] start {startOffset} != 10");
}
var unknown = reader.ReadByte();
if (unknown != 0x01)
{
throw new InvalidDataException("code [55] separator != 0x01");
}
var endOffset = reader.ReadInt32LE() - Offset;
ReadString(reader);
if (endOffset != 10 + reader.GetStringZByteCount(Content))
{
throw new InvalidDataException($"code [55] end {endOffset} != 10 + strlen {reader.GetStringZByteCount(Content)}");
}
}
}
public bool Decode(byte[] output, int dst_pos, int output_size, IBinaryStream input, out int output_chunk_size)
{
for (int i = 0; i < Length; ++i)
{
if (0 != (m_ctl_bits[i >> 3] & 1))
{
m_data[i] = 0;
}
else
{
int next = input.ReadByte();
if (-1 == next)
{
break;
}
m_data[i] = (byte)next;
}
m_ctl_bits[i >> 3] >>= 1;
}
m_data[0] ^= m_last_byte;
for (int i = 0; i < Length; ++i)
{
m_data[i + 1] ^= m_data[i];
}
m_last_byte = m_data[Length - 1];
output_chunk_size = Math.Min(Length, output_size);
Buffer.BlockCopy(m_data, 0, output, dst_pos, output_chunk_size);
return(Length > output_size);
}
public byte[] Unpack()
{
m_input.Position = 12;
m_dst = 0;
for (int i = 0; i < m_chunk_count; ++i)
{
int ctl = m_input.ReadByte();
if (-1 == ctl)
{
break;
}
int count = (ctl & 0xF) + 1;
switch (ctl & 0xF0)
{
case 0x00: Chunk00(count); break;
case 0x10: Chunk10(count); break;
case 0x40: Chunk40(count); break;
case 0x80: Chunk80(count); break;
}
}
return(m_output);
}
ushort LoadBits(int count)
{
word_471D60 <<= count;
if (count > m_bits_avail)
{
do
{
count -= m_bits_avail;
word_471D60 |= (ushort)(m_bits << count);
int bits = m_input.ReadByte();
if (-1 == bits)
{
bits = 0;
m_eof = true;
}
m_bits = bits;
m_bits_avail = 8;
}while (count > 8);
}
int v = m_bits_avail - count;
ushort result = (ushort)(m_bits >> v);
m_bits_avail = v;
word_471D60 |= result;
return(result);
}
DelphiObject DeserializeNode()
{
int type_len = m_input.ReadByte();
if (type_len <= 0)
{
return(null);
}
var node = new DelphiObject();
node.Type = ReadString(type_len);
node.Name = ReadString();
int key_length;
while ((key_length = m_input.ReadUInt8()) > 0)
{
var key = ReadString(key_length);
node.Props[key] = ReadValue();
}
DelphiObject child;
while ((child = DeserializeNode()) != null)
{
node.Contents.Add(child);
}
return(node);
}
void Unpack24()
{
int dst = 0;
int bits = 0;
int mask = 0;
while (dst < m_output.Length)
{
mask >>= 1;
if (0 == mask)
{
bits = m_input.ReadByte();
mask = 0x80;
}
if (0 != (bits & mask))
{
m_input.Read(m_output, dst, 3);
dst += 4;
}
else
{
int offset = m_input.ReadUInt16();
int count = (1 + (offset & 0xF)) * 4;
offset = (1 + (offset >> 4)) * 4;
Binary.CopyOverlapped(m_output, dst - offset, dst, count);
dst += count;
}
}
}
void UnpackChannel(IBinaryStream input, byte[] output)
{
int dst = 0;
while (dst < output.Length)
{
int count = input.ReadByte();
if (count < 0)
{
break;
}
if (count <= 0x32)
{
input.Read(output, dst, count);
dst += count;
}
else
{
count -= 0x32;
byte v = input.ReadUInt8();
while (count-- > 0)
{
output[dst++] = v;
}
}
}
}
bool SkipFrameTable(IBinaryStream file)
{
file.Position = 4;
int table_count = file.ReadInt16();
file.Position = 8;
for (int i = 0; i < table_count; ++i)
{
switch (file.ReadByte())
{
case 0: break;
case 1: file.Seek(8, SeekOrigin.Current); break;
case 2:
case 3:
case 4:
case 5: file.Seek(4, SeekOrigin.Current); break;
default: return(false);
}
}
int count = file.ReadUInt16();
file.Seek(count * 8, SeekOrigin.Current);
return(true);
}
public override ImageData Read(IBinaryStream stream, ImageMetaData info)
{
stream.Position = 4;
var pixels = new byte[3 * info.Width * info.Height];
int dst = 0;
while (dst < pixels.Length)
{
int count = stream.ReadByte();
if (-1 == count)
{
throw new EndOfStreamException();
}
if (0 != (count & 0x80))
{
count = 3 * (count & 0x7F);
stream.Read(pixels, dst, count);
dst += count;
}
else
{
count *= 3;
stream.Read(pixels, dst, 3);
Binary.CopyOverlapped(pixels, dst, dst + 3, count - 3);
dst += count;
}
}
return(ImageData.Create(info, PixelFormats.Bgr24, null, pixels));
}
void UnpackRle()
{
int dst = 0;
while (dst < m_output.Length)
{
int count = m_input.ReadByte();
if (-1 == count)
{
break;
}
if (0 != (count & 0x80))
{
byte v = m_input.ReadUInt8();
count = (count & 0x7F) + 1;
while (count-- > 0)
{
m_output[dst++] = v;
}
}
else
{
count++;
m_input.Read(m_output, dst, count);
dst += count;
}
}
}
public void Unpack(byte[] output)
{
ReadDict();
var root = BuildTree();
int dst = 0;
int bits = 0;
byte mask = 0;
while (dst < output.Length)
{
var token = root;
while (token > 0x100)
{
if (0 == mask)
{
bits = m_input.ReadByte();
if (-1 == bits)
{
return;
}
mask = 0x80;
}
if ((bits & mask) != 0)
{
token = m_tree[token].RNode;
}
else
{
token = m_tree[token].LNode;
}
mask >>= 1;
}
output[dst++] = (byte)token;
}
}
public override SoundInput TryOpen(IBinaryStream file)
{
var header = file.ReadHeader(0x10);
int samples = header.ToInt32(4);
uint sample_rate = header.ToUInt32(8);
if (sample_rate < 8000 || sample_rate > 96000)
{
return(null);
}
ushort channels = header.ToUInt16(12);
if (channels != 1 && channels != 2)
{
return(null);
}
samples *= channels;
var output = new byte[2 * samples];
var first = new AdpDecoder();
var second = first;
if (channels > 1)
{
second = new AdpDecoder();
}
int dst = 0;
while (samples > 0)
{
int v = file.ReadByte();
if (-1 == v)
{
break;
}
LittleEndian.Pack(first.DecodeSample(v), output, dst);
if (0 == --samples)
{
break;
}
dst += 2;
LittleEndian.Pack(second.DecodeSample(v >> 4), output, dst);
dst += 2;
--samples;
}
var format = new WaveFormat {
FormatTag = 1,
Channels = channels,
SamplesPerSecond = sample_rate,
AverageBytesPerSecond = 2u * channels * sample_rate,
BlockAlign = (ushort)(2 * channels),
BitsPerSample = 16,
};
var pcm = new MemoryStream(output);
var sound = new RawPcmInput(pcm, format);
file.Dispose();
return(sound);
}
int ReadPacketSize(IBinaryStream input)
{
int lo = input.ReadByte();
if (-1 == lo)
{
return(0);
}
int hi = input.ReadByte();
if (-1 == hi)
{
return(0);
}
return(hi << 8 | lo);
}
internal byte[] LzDecompress(IBinaryStream input)
{
int unpacked_size = input.ReadInt32();
var data = new byte[unpacked_size];
int dst = 0;
while (dst < unpacked_size)
{
int ctl = input.ReadByte();
if (-1 == ctl)
{
throw new EndOfStreamException();
}
if (0 != (ctl & 0x80))
{
byte lo = input.ReadUInt8();
int offset = ((ctl << 3 | lo >> 5) & 0x3FF) + 1;
int count = (lo & 0x1F) + 1;
Binary.CopyOverlapped(data, dst - offset, dst, count);
dst += count;
}
else
{
int count = ctl + 1;
if (input.Read(data, dst, count) != count)
{
throw new EndOfStreamException();
}
dst += count;
}
}
return(data);
}
public override ImageData Read(IBinaryStream file, ImageMetaData info)
{
file.Position = 0xC;
var palette = ReadColorMap(file.AsStream, 256, PaletteFormat.Bgr);
int stride = (int)info.Width * 3;
var pixels = new byte[stride * (int)info.Height];
int dst = 0;
while (dst < pixels.Length)
{
int ctl = file.PeekByte();
if (-1 == ctl)
{
break;
}
if (1 == ctl)
{
file.ReadByte();
int idx = file.ReadByte();
var color = palette[idx];
pixels[dst] = color.B;
pixels[dst + 1] = color.G;
pixels[dst + 2] = color.R;
dst += 3;
}
else if (2 == ctl)
{
file.ReadByte();
int idx = file.ReadByte();
int count = file.ReadByte();
var color = palette[idx];
for (int i = 0; i < count; ++i)
{
pixels[dst] = color.B;
pixels[dst + 1] = color.G;
pixels[dst + 2] = color.R;
dst += 3;
}
}
else
{
file.Read(pixels, dst, 3);
dst += 3;
}
}
return(ImageData.CreateFlipped(info, PixelFormats.Bgr24, null, pixels, stride));
}
protected override IEnumerator <int> Unpack()
{
for (int i = 0; i < Chunks; ++i)
{
int ctl = m_input.ReadByte();
if (-1 == ctl)
{
yield break;
}
int count;
if (ctl <= 1)
{
if (0 == ctl)
{
count = m_input.ReadUInt8();
}
else
{
count = 0x100;
}
while (count > 0)
{
int avail = Math.Min(count, m_length);
int read = m_input.Read(m_buffer, m_pos, avail);
if (0 == read)
{
yield break;
}
count -= read;
m_pos += read;
m_length -= read;
if (0 == m_length)
{
yield return(m_pos);
}
}
}
else
{
if (3 == ctl)
{
count = m_input.ReadUInt16();
}
else
{
count = ctl;
}
byte v = m_input.ReadUInt8();
while (count-- > 0)
{
m_buffer[m_pos++] = v;
if (0 == --m_length)
{
yield return(m_pos);
}
}
}
}
}
byte[] UnpackCfp0(IBinaryStream input)
{
input.Position = 8;
int unpacked_size = input.ReadInt32();
var output = new byte[unpacked_size];
int dst = 0;
while (dst < output.Length)
{
int cmd = input.ReadByte();
int count = 0;
switch (cmd)
{
case 0:
count = input.ReadUInt8();
input.Read(output, dst, count);
break;
case 1:
count = input.ReadInt32();
input.Read(output, dst, count);
break;
case 2:
{
count = input.ReadUInt8();
byte v = input.ReadUInt8();
for (int i = 0; i < count; ++i)
{
output[dst + i] = v;
}
break;
}
case 3:
{
count = input.ReadInt32();
byte v = input.ReadUInt8();
for (int i = 0; i < count; ++i)
{
output[dst + i] = v;
}
break;
}
case 6:
int offset = input.ReadUInt16();
count = input.ReadUInt16();
Binary.CopyOverlapped(output, dst - offset, dst, count);
break;
case 15:
case -1:
return(output);
}
dst += count;
}
return(output);
}
public void Unpack()
{
int pixels_remaining = m_data.Length;
int data_pos = 0;
int eax = 0;
while (pixels_remaining > 0)
{
int count = eax * 3 + 3;
if (count > pixels_remaining)
{
throw new InvalidFormatException();
}
pixels_remaining -= count;
if (count != m_input.Read(m_data, data_pos, count))
{
throw new InvalidFormatException();
}
data_pos += count;
while (pixels_remaining > 0)
{
eax = m_input.ReadByte();
if (0 == (eax & 0x80))
{
if (0x7f == eax)
{
eax += m_input.ReadUInt16();
}
break;
}
int shift_index = eax >> 2;
eax &= 3;
if (3 == eax)
{
eax += m_input.ReadUInt16();
}
count = eax * 3 + 3;
if (pixels_remaining < count)
{
throw new InvalidFormatException();
}
pixels_remaining -= count;
int shift = ShiftTable[shift_index & 0x1f];
int shift_row = shift & 0x0f;
shift >>= 4;
shift_row *= (int)m_width;
shift -= shift_row;
shift *= 3;
if (shift >= 0 || data_pos + shift < 0)
{
throw new InvalidFormatException();
}
Binary.CopyOverlapped(m_data, data_pos + shift, data_pos, count);
data_pos += count;
}
}
}
void Unpack(IBinaryStream input, int input_size, byte[] output)
{
int dst = 0;
while (input_size > 0)
{
int count;
int ctl = input.ReadByte();
--input_size;
if (0 == (ctl & 0xC0))
{
count = ((ctl & 0x3F) + 1) * 4;
input.Read(output, dst, count);
input_size -= count;
}
else
{
int offset;
if (0x40 == (ctl & 0xC0))
{
count = (ctl & 0x3F) + 1;
offset = 1;
}
else if (0x80 == (ctl & 0xE0))
{
count = (ctl & 0x1F) + 1;
offset = input.ReadByte();
--input_size;
}
else if (0xA0 == (ctl & 0xE0))
{
count = (ctl & 0x1F) + 1;
offset = input.ReadUInt16();
input_size -= 2;
}
else
{
continue;
}
count *= 4;
offset *= 4;
Binary.CopyOverlapped(output, dst - offset, dst, count);
}
dst += count;
}
}
internal static uint ReadUInt(IBinaryStream input)
{
if (input.ReadByte() != 4)
{
throw new InvalidFormatException();
}
return(Binary.BigEndian(input.ReadUInt32()));
}
} // 'OggS'
public override SoundInput TryOpen(IBinaryStream file)
{
file.Position = 0x1E;
int offset = file.ReadByte();
if (offset <= 0)
{
return(null);
}
file.Position = 0x20 + offset;
if (!(file.ReadByte() == 'O' && file.ReadByte() == 'g' &&
file.ReadByte() == 'g' && file.ReadByte() == 'S'))
{
return(null);
}
return(new OggInput(new StreamRegion(file.AsStream, 0x20 + offset)));
}
protected void ReadHeader(int start)
{
m_input.Position = start;
SkipChunk();
m_title = ReadString();
if (m_version.Major < 3)
{
m_input.ReadCString();
}
SkipString();
SkipString();
m_input.ReadByte();
SkipString();
SkipString();
SkipDict();
m_input.ReadByte();
}
public override ImageMetaData ReadMetaData(IBinaryStream file)
{
file.Position = 4;
int type = file.ReadByte();
int bpp = file.ReadByte();
if (24 != bpp && 32 != bpp)
{
throw new NotSupportedException("Not supported CPB image format");
}
int version = file.ReadInt16();
if (1 != version && 0 != version)
{
throw new NotSupportedException("Not supported CPB image version");
}
var info = new CpbMetaData {
Type = type,
Version = version,
BPP = bpp,
};
if (1 == version)
{
file.ReadUInt32();
info.Width = file.ReadUInt16();
info.Height = file.ReadUInt16();
info.Channel[0] = file.ReadUInt32();
info.Channel[1] = file.ReadUInt32();
info.Channel[2] = file.ReadUInt32();
info.Channel[3] = file.ReadUInt32();
}
else
{
info.Width = file.ReadUInt16();
info.Height = file.ReadUInt16();
file.ReadUInt32();
info.Channel[0] = file.ReadUInt32();
info.Channel[1] = file.ReadUInt32();
info.Channel[2] = file.ReadUInt32();
info.Channel[3] = file.ReadUInt32();
}
info.DataOffset = (uint)file.Position;
return(info);
}
public override ImageMetaData ReadMetaData(IBinaryStream stream)
{
if ('A' != stream.ReadByte() || 'M' != stream.ReadByte())
{
return(null);
}
var header = new byte[0x30];
if (0x2e != stream.Read(header, 2, 0x2e))
{
return(null);
}
uint size = LittleEndian.ToUInt32(header, 2);
if (size != stream.Length)
{
return(null);
}
int am_type = header[0x16];
if (am_type != 2 && am_type != 1 || header[0x18] != 1)
{
return(null);
}
var info = new AmMetaData();
info.Width = LittleEndian.ToUInt16(header, 6);
info.Height = LittleEndian.ToUInt16(header, 8);
info.MaskWidth = LittleEndian.ToUInt16(header, 0x0a);
info.MaskHeight = LittleEndian.ToUInt16(header, 0x0c);
info.Colors = LittleEndian.ToUInt16(header, 0x12);
info.BPP = header[0x14];
info.IsCompressed = 0 != header[0x15];
info.DataOffset = LittleEndian.ToUInt32(header, 0x1a);
info.DataLength = LittleEndian.ToUInt32(header, 0x1e);
info.MaskOffset = LittleEndian.ToUInt32(header, 0x22);
info.MaskLength = LittleEndian.ToUInt32(header, 0x26);
info.IsMaskCompressed = 0 != header[0x2a];
if (checked (info.DataLength + info.MaskLength) > size)
{
return(null);
}
return(info);
}
void LzUnpack(IBinaryStream input, byte[] output)
{
var frame = new byte[0x1000];
int dst = 0;
int bits = 0;
int mask = 0;
int frame_pos = 0xFEE;
while (dst < output.Length)
{
mask >>= 1;
if (0 == mask)
{
bits = input.ReadByte();
if (-1 == bits)
{
break;
}
mask = 0x80;
}
if (0 == (bits & mask))
{
int b = input.ReadByte();
if (-1 == b)
{
break;
}
output[dst++] = (byte)b;
frame[frame_pos++ & 0xFFF] = (byte)b;
}
else
{
int offset = input.ReadUInt16();
int count = (offset & 0xF) + 3;
offset >>= 4;
while (count-- > 0 && dst < output.Length)
{
byte v = frame[offset++ & 0xFFF];
frame[frame_pos++ & 0xFFF] = v;
output[dst++] = v;
}
}
}
}
public override ImageMetaData ReadMetaData(IBinaryStream file)
{
var header = file.ReadHeader(0x18);
if (!header.AsciiEqual("CLS_TEXFILE"))
{
return(null);
}
file.Position = header.ToUInt32(0x14);
int frame_offset = file.ReadInt32();
file.Position = frame_offset + 4;
if (file.ReadUInt16() != 1)
{
return(null);
}
file.Position = frame_offset + 0x1C;
uint width = file.ReadUInt32();
uint height = file.ReadUInt32();
int x = file.ReadInt32();
int y = file.ReadInt32();
file.Position = frame_offset + 0x30;
if (file.ReadByte() != 1)
{
return(null);
}
int format = file.ReadByte();
if (format != 4 && format != 5 && format != 2)
{
return(null);
}
return(new ClsMetaData {
Width = width,
Height = height,
OffsetX = x,
OffsetY = y,
BPP = 8 * (format - 1),
FrameOffset = frame_offset,
});
}
void UnpackRle(IBinaryStream input, byte[] output)
{
var header = input.ReadBytes(0x18);
byte count_limit = header[5];
int dst = 0;
while (dst < output.Length)
{
int v = input.ReadByte();
if (-1 == v)
{
break;
}
int count = 1;
while (count < count_limit)
{
if (input.PeekByte() != v)
{
break;
}
++count;
input.ReadByte();
}
if (count == count_limit)
{
byte ctl = input.ReadUInt8();
if (ctl > 0x7F)
{
byte lo = input.ReadUInt8();
count += lo + ((ctl & 0x7F) << 8) + 128;
}
else
{
count += ctl;
}
}
for (int i = 0; i < count; ++i)
{
output[dst++] = (byte)v;
}
}
}
public override ImageMetaData ReadMetaData(IBinaryStream stream)
{
int A = stream.ReadByte();
int P = stream.ReadByte();
if ('A' != A || 'P' != P)
{
return(null);
}
var info = new ImageMetaData();
info.Width = stream.ReadUInt32();
info.Height = stream.ReadUInt32();
info.BPP = stream.ReadInt16();
if (info.Width > 0x8000 || info.Height > 0x8000 || !(32 == info.BPP || 24 == info.BPP))
{
return(null);
}
return(info);
}
protected override IImageDecoder DecryptImage(IBinaryStream input, AImageScheme scheme)
{
int id = input.ReadByte();
if (id == scheme.Value2)
{
return(new AImageReader(input, scheme));
}
input.Position = 0;
return(new ImageFormatDecoder(input));
}
/// <summary>
/// Tests the stream.
/// </summary>
private static unsafe void TestStream(IBinaryStream stream, bool sameArr, Action flush)
{
Action seek = () => Assert.AreEqual(0, stream.Seek(0, SeekOrigin.Begin));
Action<Action, Func<object>, object> check = (write, read, expectedResult) =>
{
seek();
write();
flush();
seek();
Assert.AreEqual(expectedResult, read());
};
// Arrays.
Assert.AreEqual(sameArr, stream.IsSameArray(stream.GetArray()));
Assert.IsFalse(stream.IsSameArray(new byte[1]));
Assert.IsFalse(stream.IsSameArray(stream.GetArrayCopy()));
// byte*
byte* bytes = stackalloc byte[10];
*bytes = 1;
*(bytes + 1) = 2;
stream.Write(bytes, 2);
Assert.AreEqual(2, stream.Position);
flush();
seek();
Assert.AreEqual(sameArr ? 256 : 2, stream.Remaining);
byte* bytes2 = stackalloc byte[2];
stream.Read(bytes2, 2);
Assert.AreEqual(1, *bytes2);
Assert.AreEqual(2, *(bytes2 + 1));
// char*
seek();
char* chars = stackalloc char[10];
*chars = 'a';
*(chars + 1) = 'b';
Assert.AreEqual(2, stream.WriteString(chars, 2, 2, Encoding.ASCII));
flush();
seek();
stream.Read(bytes2, 2);
Assert.AreEqual('a', *bytes2);
Assert.AreEqual('b', *(bytes2 + 1));
// Others.
check(() => stream.Write(new byte[] {3, 4, 5}, 1, 2), () => stream.ReadByteArray(2), new byte[] {4, 5});
check(() => stream.WriteBool(true), () => stream.ReadBool(), true);
check(() => stream.WriteBoolArray(new[] {true, false}), () => stream.ReadBoolArray(2),
new[] {true, false});
check(() => stream.WriteByte(4), () => stream.ReadByte(), 4);
check(() => stream.WriteByteArray(new byte[] {4, 5, 6}), () => stream.ReadByteArray(3),
new byte[] {4, 5, 6});
check(() => stream.WriteChar('x'), () => stream.ReadChar(), 'x');
check(() => stream.WriteCharArray(new[] {'a', 'b'}), () => stream.ReadCharArray(2), new[] {'a', 'b'});
check(() => stream.WriteDouble(4), () => stream.ReadDouble(), 4d);
check(() => stream.WriteDoubleArray(new[] {4d}), () => stream.ReadDoubleArray(1), new[] {4d});
check(() => stream.WriteFloat(4), () => stream.ReadFloat(), 4f);
check(() => stream.WriteFloatArray(new[] {4f}), () => stream.ReadFloatArray(1), new[] {4f});
check(() => stream.WriteInt(4), () => stream.ReadInt(), 4);
check(() => stream.WriteInt(0, 4), () => stream.ReadInt(), 4);
check(() => stream.WriteIntArray(new[] {4}), () => stream.ReadIntArray(1), new[] {4});
check(() => stream.WriteLong(4), () => stream.ReadLong(), 4L);
check(() => stream.WriteLongArray(new[] {4L}), () => stream.ReadLongArray(1), new[] {4L});
check(() => stream.WriteShort(4), () => stream.ReadShort(), (short)4);
check(() => stream.WriteShortArray(new short[] {4}), () => stream.ReadShortArray(1), new short[] {4});
}
/// <summary>
/// Reads the schema according to this header data.
/// </summary>
/// <param name="stream">The stream.</param>
/// <param name="position">The position.</param>
/// <param name="hdr">The header.</param>
/// <param name="fieldIdsFunc">The field ids function.</param>
/// <returns>
/// Schema.
/// </returns>
public static BinaryObjectSchemaField[] ReadSchema(IBinaryStream stream, int position, BinaryObjectHeader hdr,
Func<int[]> fieldIdsFunc)
{
Debug.Assert(stream != null);
Debug.Assert(fieldIdsFunc != null);
var schemaSize = hdr.SchemaFieldCount;
if (schemaSize == 0)
return null;
stream.Seek(position + hdr.SchemaOffset, SeekOrigin.Begin);
var res = new BinaryObjectSchemaField[schemaSize];
var offsetSize = hdr.SchemaFieldOffsetSize;
if (hdr.IsCompactFooter)
{
var fieldIds = fieldIdsFunc();
Debug.Assert(fieldIds.Length == schemaSize);
if (offsetSize == 1)
{
for (var i = 0; i < schemaSize; i++)
res[i] = new BinaryObjectSchemaField(fieldIds[i], stream.ReadByte());
}
else if (offsetSize == 2)
{
for (var i = 0; i < schemaSize; i++)
res[i] = new BinaryObjectSchemaField(fieldIds[i], stream.ReadShort());
}
else
{
for (var i = 0; i < schemaSize; i++)
res[i] = new BinaryObjectSchemaField(fieldIds[i], stream.ReadInt());
}
}
else
{
if (offsetSize == 1)
{
for (var i = 0; i < schemaSize; i++)
res[i] = new BinaryObjectSchemaField(stream.ReadInt(), stream.ReadByte());
}
else if (offsetSize == 2)
{
for (var i = 0; i < schemaSize; i++)
res[i] = new BinaryObjectSchemaField(stream.ReadInt(), stream.ReadShort());
}
else
{
for (var i = 0; i < schemaSize; i++)
res[i] = new BinaryObjectSchemaField(stream.ReadInt(), stream.ReadInt());
}
}
return res;
}