public Model(Stream stream, string path)
{
base._data = Data = new Mp3Format(this, stream, path);
if (Data.FileSize > Int32.MaxValue)
{
IssueModel.Add("File is insanely large", Severity.Fatal);
return;
}
int mediaPos32;
int mediaCount32;
byte[] fBuf;
fBuf = Data.fBuf = new byte[Data.FileSize];
Data.fbs.Position = 0;
if (Data.fbs.Read(fBuf, 0, (int)Data.FileSize) != Data.FileSize)
{
IssueModel.Add("Read error", Severity.Fatal);
return;
}
// Detect ID3v2 tag block.
if (fBuf[0] == 'I' && fBuf[1] == 'D' && fBuf[2] == '3')
{
Data.id3v2Pos = 0;
if (Data.FileSize < 10)
{
IssueModel.Add("File truncated near ID3v2 header", Severity.Fatal);
return;
}
Data.Id3v2Major = Data.fBuf[3];
Data.Id3v2Revision = Data.fBuf[4];
Data.storedId3v2DataSize = ((fBuf[6] & 0x7F) << 21) + ((fBuf[7] & 0x7F) << 14) + ((fBuf[8] & 0x7F) << 7) + (fBuf[9] & 0x7F);
if (Data.storedId3v2DataSize == 0 || Data.storedId3v2DataSize + 12 > Data.FileSize)
{
IssueModel.Add("ID3v2 size of " + Data.storedId3v2DataSize + " is bad or file is truncated", Severity.Fatal);
return;
}
if ((fBuf[6] & 0x80) != 0 || (fBuf[7] & 0x80) != 0 || (fBuf[8] & 0x80) != 0 || (Data.fBuf[9] & 0x80) != 0)
{
IssueModel.Add("Zero parity error on ID3v2 size");
}
Data.actualId3v2DataSize = Data.storedId3v2DataSize;
// Check for bug in old versions of EAC that 1.5% of time writes ID3v2 size over by 1.
if (Data.Id3v2Major == 3)
{
if ((fBuf[10 + Data.storedId3v2DataSize] & 0xFE) == 0xFA)
{
if (fBuf[9 + Data.storedId3v2DataSize] == 0xFF)
{
--Data.actualId3v2DataSize;
// Bug bite comfirmed.
Data.Id3v2TagRepair = String.Format("0009=0x{0:X2}", Data.actualId3v2DataSize & 0x7F);
if ((Data.actualId3v2DataSize & 0x7F) == 0x7F)
{
Data.Id3v2TagRepair = String.Format("0008=0x{0:X2}, ", ((Data.actualId3v2DataSize >> 7) & 0x7F)) + Data.Id3v2TagRepair;
}
}
}
}
Data.ValidSize = 10 + Data.actualId3v2DataSize;
}
while (Data.ValidSize < Data.FileSize && fBuf[Data.ValidSize] == 0)
{
++Data.ValidSize;
++Data.DeadBytes;
}
if (Data.FileSize - Data.ValidSize < 0xC0)
{
IssueModel.Add("File appears truncated.", Severity.Fatal);
return;
}
Data.Header = new Mp3Header(fBuf, (int)Data.ValidSize);
if (!Data.Header.IsMpegLayer3)
{
IssueModel.Add("ID3v2 tag present but no MP3 marker found.", Severity.Fatal);
return;
}
if (Data.Header.MpegVersionBits == 1)
{
IssueModel.Add("MP3 marker found but MPEG version is not valid.", Severity.Fatal);
return;
}
mediaPos32 = (int)Data.ValidSize;
Data.ValidSize = Data.FileSize;
// Keep the audio header.
Data.aBuf = new byte[Data.Header.XingOffset + 0x9C];
Array.Copy(fBuf, mediaPos32, Data.aBuf, 0, Data.aBuf.Length);
// Detect Xing/LAME encodes:
XingModel = Mp3XingBlock.Create(Data.aBuf, Data.Header);
if (XingModel != null)
{
LameModel = XingModel as Mp3LameBlock.Model;
Data.Xing = XingModel.Data;
Data.Lame = Data.Xing as Mp3LameBlock;
}
// Detect ID3v1 tag block:
int ePos = (int)Data.FileSize;
if (ePos >= 130 && fBuf[ePos - 128] == 'T' && fBuf[ePos - 127] == 'A' && fBuf[ePos - 126] == 'G')
{
ePos -= 128;
Data.id3v1Block = new byte[128];
Array.Copy(fBuf, ePos, Data.id3v1Block, 0, 128);
}
// Detect obsolete Lyrics3v2 block:
if (ePos >= 15)
{
if (fBuf[ePos - 9] == 'L' && fBuf[ePos - 8] == 'Y' && fBuf[ePos - 7] == 'R' && fBuf[ePos - 6] == 'I' && fBuf[ePos - 5] == 'C' && fBuf[ePos - 4] == 'S' &&
fBuf[ePos - 3] == '2' && fBuf[ePos - 2] == '0' && fBuf[ePos - 1] == '0')
{
int l3size = 0;
for (var bi = ePos - 15; bi < ePos - 9; ++bi)
{
if (fBuf[bi] < '0' || fBuf[bi] > '9')
{
IssueModel.Add("Invalid Lyrics3v2 length digit.");
return;
}
l3size = l3size * 10 + fBuf[bi] - '0';
}
Data.Lyrics3Size = l3size + 15;
ePos -= Data.Lyrics3Size;
if (ePos < 2)
{
IssueModel.Add("Invalid Lyrics3v2 length.");
return;
}
}
}
// Detect APE tag block:
if (ePos >= 34)
{
int pos = ePos - 32;
if (fBuf[pos] == 'A' && fBuf[pos + 1] == 'P' && fBuf[pos + 2] == 'E' &&
fBuf[pos + 3] == 'T' && fBuf[pos + 4] == 'A' && fBuf[pos + 5] == 'G' && fBuf[pos + 6] == 'E' && fBuf[pos + 7] == 'X')
{
Data.ApeSize = 32 + fBuf[pos + 12] + (fBuf[pos + 13] << 8) + (fBuf[pos + 14] << 16) + (fBuf[pos + 15] << 24);
ePos -= Data.ApeSize;
}
}
if (ePos <= mediaPos32)
{
IssueModel.Add("Missing audio", Severity.Fatal);
return;
}
mediaCount32 = ePos - mediaPos32;
// Detect 2nd, phantom ID3v1 tag block:
if (Data.Lame != null && mediaCount32 == Data.Lame.LameSize + 128 && Data.HasId3v1 && !Data.HasLyrics3 && !Data.HasApe && ePos > 34)
{
if (fBuf[ePos - 128] == 'T' && fBuf[ePos - 127] == 'A' && fBuf[ePos - 126] == 'G')
{
ePos -= 128;
mediaCount32 -= 128;
Data.ValidSize -= 128;
Data.excess = Data.id3v1Block;
Data.id3v1Block = new byte[128];
Array.Copy(fBuf, ePos, Data.id3v1Block, 0, 128);
Data.Watermark = Likeliness.Probable;
}
}
Data.mediaPosition = mediaPos32;
Data.MediaCount = mediaCount32;
GetDiagnostics();
}
protected void ComputeContentHashes(CryptoHasher hasher, Hashes mediaHash = Hashes.None)
{
System.Diagnostics.Debug.Assert(Data.HashedFiles.HashLength == hasher.HashLength);
for (int index = 0; index < Data.HashedFiles.Items.Count; ++index)
{
HashedFile item = Data.HashedFiles.Items[index];
string msg = null;
var targetName = Data.HashedFiles.GetPath(index);
try
{
using (var tfs = new FileStream(targetName, FileMode.Open, FileAccess.Read))
{
HashedModel.SetIsFound(index, true);
byte[] hash = null;
if (item.Style == HashStyle.Media)
{
if (mediaHash == Hashes.None)
{
IssueModel.Add("Unexpected media hash on item " + (index + 1) + ".");
}
else
{
var hdr = new byte[0x3F];
tfs.Position = 0;
int got = tfs.Read(hdr, 0, hdr.Length);
Mp3Format.Model fmt = Mp3Format.CreateModel(tfs, hdr, targetName);
if (fmt == null)
{
// Only MP3 supported for now.
IssueModel.Add("Unexpected file format.");
}
else
{
fmt.CalcHashes(mediaHash, Validations.None);
fmt.CloseFile();
hash = fmt.Data.MediaSHA1;
}
}
}
else
{
hasher.Append(tfs);
hash = hasher.GetHashAndReset();
}
HashedModel.SetActualHash(index, hash);
if (item.IsMatch == false)
{
IssueModel.Add(Data.HasherName + " mismatch on '" + item.FileName + "'.");
}
}
}
catch (FileNotFoundException ex)
{ msg = ex.Message.TrimEnd(null); }
catch (IOException ex)
{ msg = ex.Message.TrimEnd(null); }
catch (UnauthorizedAccessException ex)
{ msg = ex.Message.TrimEnd(null); }
if (msg != null)
{
HashedModel.SetIsFound(index, false);
IssueModel.Add(msg);
}
}
string tx = Data.HasherName + " validation of " + Data.HashedFiles.Items.Count + " file";
if (Data.HashedFiles.Items.Count != 1)
{
tx += "s";
}
if (base.Data.Issues.MaxSeverity < Severity.Error)
{
tx += " successful.";
}
else
{
tx += " failed with " + Data.HashedFiles.FoundCount + " found and " + Data.HashedFiles.MatchCount + " matched.";
}
IssueModel.Add(tx, Severity.Advisory);
}
