public Model(Stream stream, byte[] hdr, string path)
{
base._data = Data = new FlvFormat(this, stream, path);
var bb = new byte[15];
Data.flags = hdr[4];
if ((Data.flags & 0xA) != 0)
{
IssueModel.Add("Unexpected flags.");
}
if ((Data.flags & 5) == 0)
{
IssueModel.Add("Missing audio and video.");
}
UInt32 hdrSize = ConvertTo.FromBig32ToUInt32(hdr, 5);
if (hdrSize != 9)
{
IssueModel.Add("Wrong header size.");
}
Data.mediaPosition = 9;
UInt32 actualPrevSize = 0;
while (Data.mediaPosition < Data.FileSize)
{
if (Data.mediaPosition + 15 > Data.FileSize)
{
IssueModel.Add("File truncated near packet header.", Severity.Fatal); return;
}
Data.fbs.Position = Data.mediaPosition;
var got = Data.fbs.Read(bb, 0, bb.Length);
if (got < bb.Length)
{
IssueModel.Add("Read error", Severity.Fatal); return;
}
Data.mediaPosition += 15;
UInt32 storedPrevSize = ConvertTo.FromBig32ToUInt32(bb, 0);
if (storedPrevSize != actualPrevSize)
{
IssueModel.Add("Bad previous packet size.");
}
byte packetType = bb[4];
UInt32 packetSize = ConvertTo.FromBig24ToUInt32(bb, 5);
actualPrevSize = packetSize + 11;
++Data.PacketCount;
Data.mediaPosition += packetSize;
}
if (Data.mediaPosition > Data.FileSize)
{
IssueModel.Add("File truncated.", Severity.Fatal);
}
}
private void ParseAif(Stream stream, byte[] hdr)
{
Data.GroupId = ConvertTo.FromAsciiToString(hdr, 0, 4);
Data.FormType = ConvertTo.FromAsciiToString(hdr, 8, 4);
UInt32 gSize = ConvertTo.FromBig32ToUInt32(hdr, 4);
if (gSize < 12 || gSize > stream.Length - 8)
{
IssueModel.Add("File truncated or corrupt.", Severity.Fatal); return;
}
int hPos = 12;
string id0 = ConvertTo.FromAsciiToString(hdr, 12, 4);
if (Data.IsCompressed)
{
if (id0 != "FVER")
{
IssueModel.Add("Missing 'FVER' chunk."); return;
}
UInt32 vSize = ConvertTo.FromBig32ToUInt32(hdr, 16);
if (vSize != 4)
{
IssueModel.Add("Bad 'FVER' chunk."); return;
}
hPos = 24;
id0 = ConvertTo.FromAsciiToString(hdr, 24, 4);
}
if (id0 != "COMM")
{
IssueModel.Add("Missing 'COMM' chunk."); return;
}
UInt32 cSize = ConvertTo.FromBig32ToUInt32(hdr, hPos + 4);
if (cSize < 18 || cSize > stream.Length - 8)
{
IssueModel.Add("Bad 'COMM' chunk."); return;
}
Data.ChannelCount = ConvertTo.FromBig16ToInt32(hdr, hPos + 8);
Data.SampleSize = ConvertTo.FromBig16ToInt32(hdr, hPos + 14);
++Data.IffChunkCount;
Data.IffSize = gSize;
Data.mediaPosition = 0;
Data.MediaCount = gSize + 8;
Data.ValidSize = hPos + cSize + 8;
var hasSSND = false;
var buf = new byte[8];
while (Data.ValidSize < Data.MediaCount)
{
stream.Position = Data.ValidSize;
int got = stream.Read(buf, 0, 8);
if (got != 8)
{
IssueModel.Add("Read failed."); return;
}
cSize = ConvertTo.FromBig32ToUInt32(buf, 4);
if (cSize < 8 || Data.ValidSize + cSize > Data.MediaCount - 8)
{
IssueModel.Add("Bad chunk size or truncated file."); return;
}
string id = ConvertTo.FromAsciiToString(buf, 0, 4);
if (id == "SSND")
{
if (hasSSND)
{
IssueModel.Add("Many 'SSND' chunks."); return;
}
hasSSND = true;
}
else if (id != "(c) " && id != "ANNO" && id != "AUTH" && id != "NAME")
{
IssueModel.Add($"Unexpected '{id}' chunk.", Severity.Trivia, IssueTags.StrictWarn); return;
}
Data.ValidSize += cSize + 8;
if ((cSize & 1) != 0)
{
++Data.ValidSize;
}
}
if (!hasSSND)
{
IssueModel.Add("Missing 'SSND' chunk.", Severity.Warning);
}
}
public Model(Stream stream, string path)
{
ChunksModel = new PngChunk.Vector.Model();
base._data = Data = new PngFormat(this, stream, path);
// Arbitrary sanity limit.
if (Data.FileSize > 100000000)
{
IssueModel.Add("File size insanely huge.", Severity.Fatal);
return;
}
Data.fBuf = new byte[(int)Data.FileSize];
var fBuf = Data.fBuf;
stream.Position = 0;
int got = stream.Read(fBuf, 0, (int)Data.FileSize);
if (got < Data.FileSize)
{
IssueModel.Add("Read failed.", Severity.Fatal);
return;
}
Data.ValidSize = 8;
do
{
UInt32 chunkSize = ConvertTo.FromBig32ToUInt32(fBuf, (int)Data.ValidSize);
if (Data.ValidSize + chunkSize + 12 > Data.FileSize)
{
IssueModel.Add("File is corrupt or truncated.", Severity.Fatal);
return;
}
string type = Encoding.ASCII.GetString(fBuf, (int)Data.ValidSize + 4, 4);
UInt32 storedCRC = ConvertTo.FromBig32ToUInt32(fBuf, (int)(Data.ValidSize + chunkSize + 8));
ChunksModel.Add(type, chunkSize, storedCRC);
var typeLow = type.ToLower();
switch (typeLow)
{
case "idat":
if (Data.mediaPosition <= 0)
{
Data.mediaPosition = Data.ValidSize;
}
break;
case "iend":
if (Data.MediaCount > 0)
{
IssueModel.Add("Multiple IEND chunks.");
}
else
{
Data.MediaCount = Data.ValidSize - Data.mediaPosition + chunkSize + 0xC;
}
break;
case "ihdr":
if (chunkSize < 13)
{
IssueModel.Add("IHDR chunk is short.");
}
else if (Data.Width != null)
{
IssueModel.Add("Multiple IHDR chunks.");
}
else
{
Data.Width = ConvertTo.FromBig32ToInt32(fBuf, (int)Data.ValidSize + 8);
Data.Height = ConvertTo.FromBig32ToInt32(fBuf, (int)Data.ValidSize + 12);
Data.BitDepth = fBuf[(int)Data.ValidSize + 16];
Data.ColorType = fBuf[(int)Data.ValidSize + 17];
Data.CompressionMethod = fBuf[(int)Data.ValidSize + 18];
Data.FilterMethod = fBuf[(int)Data.ValidSize + 19];
Data.InterlaceMethod = fBuf[(int)Data.ValidSize + 20];
}
break;
case "phys":
if (chunkSize < 9)
{
IssueModel.Add("PHYS chunk is short.");
}
else if (Data.DotsPerMeter1 != null)
{
IssueModel.Add("Multiple PHYS chunks.");
}
else
{
Data.DotsPerMeter1 = ConvertTo.FromBig32ToInt32(fBuf, (int)Data.ValidSize + 8);
Data.DotsPerMeter2 = ConvertTo.FromBig32ToInt32(fBuf, (int)Data.ValidSize + 12);
Data.Units = fBuf[(int)Data.ValidSize + 9];
}
break;
case "text":
if (chunkSize > 0x7FFF)
{
IssueModel.Add("String size too large.");
}
else
{
var escaped = new StringBuilder();
for (int ix = (int)Data.ValidSize + 8; ix < (int)Data.ValidSize + 8 + chunkSize; ++ix)
{
if (fBuf[ix] < ' ' || fBuf[ix] > 0x7F)
{
escaped.Append($"\\{fBuf[ix]:x2}");
}
else
{
escaped.Append((char)fBuf[ix]);
}
}
Data.texts.Add(escaped.ToString());
}
break;
case "gama":
if (chunkSize < 4)
{
IssueModel.Add("GAMA chunk is short.");
}
else if (Data.Gamma != null)
{
IssueModel.Add("Multiple GAMA chunks.");
}
else
{
Data.Gamma = ConvertTo.FromBig32ToUInt32(fBuf, (int)Data.ValidSize + 8) / 100000f;
}
break;
}
Data.ValidSize += chunkSize + 0xC;
}while (Data.ValidSize < Data.FileSize);
if (Data.Width == null)
{
IssueModel.Add("Missing IHDR chunk.");
}
if (Data.Chunks.Items[Data.Chunks.Items.Count - 1].Type != "IEND")
{
IssueModel.Add("Missing IEND chunk.");
}
if (Data.Width <= 0 || Data.Height <= 0)
{
IssueModel.Add("Invalid dimensions.");
}
if (Data.DotsPerMeter1 != Data.DotsPerMeter2)
{
IssueModel.Add("Density aspect not 1.", Severity.Warning);
}
if (Data.BitDepth != 1 && Data.BitDepth != 2 && Data.BitDepth != 4 && Data.BitDepth != 8 && Data.BitDepth != 16)
{
IssueModel.Add($"Invalid bit depth '{Data.BitDepth}'.");
}
if (Data.CompressionMethod != 0)
{
IssueModel.Add($"Invalid compression '{Data.CompressionMethod}'.");
}
if (Data.FilterMethod != 0)
{
IssueModel.Add($"Invalid filter '{Data.FilterMethod}'.");
}
if (Data.InterlaceMethod != 0 && Data.InterlaceMethod != 1)
{
IssueModel.Add($"Invalid interlace '{Data.InterlaceMethod}'.");
}
}