void ReadHeader(EriFile erif)
{
var section = erif.ReadSection();
if (section.Id != "Header " || section.Length <= 0 || section.Length > int.MaxValue)
{
return(null);
}
m_stream_pos = erif.BaseStream.Position + section.Length;
section = erif.ReadSection();
if (section.Id != "FileHdr" || section.Length < 8)
{
return(null);
}
var file_hdr = new byte[section.Length];
erif.Read(file_hdr, 0, file_hdr.Length);
if (0 == (file_hdr[5] & 1))
{
return(null);
}
section = erif.ReadSection();
if (section.Id != "SoundInf" || section.Length < 0x24)
{
return(null);
}
var info = new EmsacSoundInfo();
info.Version = erif.ReadInt32();
info.Transformation = (CvType)erif.ReadInt32();
info.Architecture = (EriCode)erif.ReadInt32();
info.ChannelCount = erif.ReadInt32();
info.SamplesPerSec = erif.ReadUInt32();
info.BlocksetCount = erif.ReadUInt32();
info.SubbandDegree = erif.ReadInt32();
info.AllSampleCount = erif.ReadInt32();
info.LappedDegree = erif.ReadInt32();
SetSoundInfo(info);
SetWaveFormat(info);
erif.BaseStream.Position = m_stream_pos;
var stream_size = erif.FindSection("Stream ");
m_stream_pos = erif.BaseStream.Position;
}
public Stream Decode()
{
m_input.Position = 0x40;
using (var erif = new EriFile(m_input))
{
ReadHeader(erif);
int total_bytes = m_info.AllSampleCount * BitsPerSample / 8;
var output = new MemoryStream(total_bytes);
try
{
var buffer = new byte[0x10000];
var decoded = new byte[0x10000];
erif.BaseStream.Position = m_stream_pos;
while (total_bytes > 0)
{
var section = erif.ReadSection();
if (section.Id != "SoundStm")
{
break;
}
int stm_length = (int)section.Length;
if (stm_length > buffer.Length)
{
buffer = new byte[stm_length];
}
erif.Read(m_buffer, 0, stm_length);
int length = m_buffer.ToInt32(4) * m_lappedSubband;
if (length > decoded.Length)
{
decoded = new byte[length];
}
DecodeBlock(buffer, decoded);
length = Math.Min(length, total_bytes);
output.Write(decoded, 0, length);
total_bytes -= length;
}
}
catch (EndOfStreamException) { /* ignore EOF errors */ }
output.Position = 0;
return(output);
}
}
} // 'Enti'
public override ImageMetaData ReadMetaData(IBinaryStream stream)
{
var header = stream.ReadHeader(0x40);
if (0x03000100 != header.ToUInt32(8))
{
return(null);
}
if (!header.AsciiEqual(0x10, "Entis Rasterized Image") &&
!header.AsciiEqual(0x10, "Moving Entis Image"))
{
return(null);
}
using (var reader = new EriFile(stream.AsStream))
{
var section = reader.ReadSection();
if (section.Id != "Header " || section.Length <= 0)
{
return(null);
}
int header_size = (int)section.Length;
int stream_pos = 0x50 + header_size;
EriFileHeader file_header = null;
EriMetaData info = null;
string desc = null;
while (header_size > 0x10)
{
section = reader.ReadSection();
header_size -= 0x10;
if (section.Length <= 0 || section.Length > header_size)
{
break;
}
if ("FileHdr " == section.Id)
{
file_header = new EriFileHeader {
Version = reader.ReadInt32()
};
if (file_header.Version > 0x00020100)
{
throw new InvalidFormatException("Invalid ERI file version");
}
file_header.ContainedFlag = reader.ReadInt32();
file_header.KeyFrameCount = reader.ReadInt32();
file_header.FrameCount = reader.ReadInt32();
file_header.AllFrameTime = reader.ReadInt32();
}
else if ("ImageInf" == section.Id)
{
int version = reader.ReadInt32();
if (version != 0x00020100 && version != 0x00020200)
{
return(null);
}
info = new EriMetaData {
StreamPos = stream_pos, Version = version
};
info.Transformation = (CvType)reader.ReadInt32();
info.Architecture = (EriCode)reader.ReadInt32();
info.FormatType = (EriType)reader.ReadInt32();
int w = reader.ReadInt32();
int h = reader.ReadInt32();
info.Width = (uint)Math.Abs(w);
info.Height = (uint)Math.Abs(h);
info.VerticalFlip = h < 0;
info.BPP = reader.ReadInt32();
info.ClippedPixel = reader.ReadInt32();
info.SamplingFlags = (EriSampling)reader.ReadInt32();
info.QuantumizedBits = reader.ReadUInt64();
info.AllottedBits = reader.ReadUInt64();
info.BlockingDegree = reader.ReadInt32();
info.LappedBlock = reader.ReadInt32();
info.FrameTransform = reader.ReadInt32();
info.FrameDegree = reader.ReadInt32();
}
else if ("descript" == section.Id)
{
if (0xFEFF == reader.PeekChar())
{
reader.Read();
var desc_chars = reader.ReadChars((int)section.Length / 2 - 1);
desc = new string (desc_chars);
}
else
{
var desc_chars = reader.ReadBytes((int)section.Length);
desc = Encoding.UTF8.GetString(desc_chars);
}
}
else
{
reader.BaseStream.Seek(section.Length, SeekOrigin.Current);
}
header_size -= (int)section.Length;
}
if (info != null)
{
if (file_header != null)
{
info.Header = file_header;
}
if (desc != null)
{
info.Description = desc;
}
}
return(info);
}
}
public override ImageMetaData ReadMetaData(Stream stream)
{
byte[] header = new byte[0x40];
if (header.Length != stream.Read (header, 0, header.Length))
return null;
if (0x03000100 != LittleEndian.ToUInt32 (header, 8))
return null;
if (!Binary.AsciiEqual (header, 0x10, "Entis Rasterized Image")
&& !Binary.AsciiEqual (header, 0x10, "Moving Entis Image"))
return null;
using (var reader = new EriFile (stream))
{
var section = reader.ReadSection();
if (section.Id != "Header " || section.Length <= 0)
return null;
int header_size = (int)section.Length;
int stream_pos = 0x50 + header_size;
EriFileHeader file_header = null;
EriMetaData info = null;
string desc = null;
while (header_size > 0x10)
{
section = reader.ReadSection();
header_size -= 0x10;
if (section.Length <= 0 || section.Length > header_size)
break;
if ("FileHdr " == section.Id)
{
file_header = new EriFileHeader { Version = reader.ReadInt32() };
if (file_header.Version > 0x00020100)
throw new InvalidFormatException ("Invalid ERI file version");
file_header.ContainedFlag = reader.ReadInt32();
file_header.KeyFrameCount = reader.ReadInt32();
file_header.FrameCount = reader.ReadInt32();
file_header.AllFrameTime = reader.ReadInt32();
}
else if ("ImageInf" == section.Id)
{
int version = reader.ReadInt32();
if (version != 0x00020100 && version != 0x00020200)
return null;
info = new EriMetaData { StreamPos = stream_pos, Version = version };
info.Transformation = (CvType)reader.ReadInt32();
info.Architecture = (EriCode)reader.ReadInt32();
info.FormatType = (EriType)reader.ReadInt32();
int w = reader.ReadInt32();
int h = reader.ReadInt32();
info.Width = (uint)Math.Abs (w);
info.Height = (uint)Math.Abs (h);
info.VerticalFlip = h < 0;
info.BPP = reader.ReadInt32();
info.ClippedPixel = reader.ReadInt32();
info.SamplingFlags = (EriSampling)reader.ReadInt32();
info.QuantumizedBits = reader.ReadUInt64();
info.AllottedBits = reader.ReadUInt64();
info.BlockingDegree = reader.ReadInt32();
info.LappedBlock = reader.ReadInt32();
info.FrameTransform = reader.ReadInt32();
info.FrameDegree = reader.ReadInt32();
}
else if ("descript" == section.Id)
{
if (0xFEFF == reader.PeekChar())
{
reader.Read();
var desc_chars = reader.ReadChars ((int)section.Length/2 - 1);
desc = new string (desc_chars);
}
else
{
var desc_chars = reader.ReadBytes ((int)section.Length);
desc = Encoding.UTF8.GetString (desc_chars);
}
}
else
{
reader.BaseStream.Seek (section.Length, SeekOrigin.Current);
}
header_size -= (int)section.Length;
}
if (info != null)
{
if (file_header != null)
info.Header = file_header;
if (desc != null)
info.Description = desc;
}
return info;
}
}