private readonly bool ReadOnly; // readonly
#endregion Fields
#region Constructors
internal PngMetadata(ChunksList chunks)
{
this.chunkList = chunks;
if (chunks is ChunksListForWrite) {
this.ReadOnly = false;
} else {
this.ReadOnly = true;
}
}
private readonly bool ReadOnly; // readonly
internal PngMetadata(ChunksList chunks)
{
this.chunkList = chunks;
if (chunks is ChunksListForWrite)
{
this.ReadOnly = false;
}
else
{
this.ReadOnly = true;
}
}
public PngReader( Stream inputStream, String filename )
{
this.filename = ( filename == null ) ? "" : filename;
this.inputStream = inputStream;
this.chunksList = new ChunksList ( null );
this.metadata = new PngMetadata ( chunksList );
this.offset = 0;
this.CurrentChunkGroup = -1;
this.ShouldCloseStream = true;
this.MaxBytesMetadata = 5 * 1024 * 1024;
this.MaxTotalBytesRead = 200 * 1024 * 1024;
this.SkipChunkMaxSize = 2 * 1024 * 1024;
this.SkipChunkIds = new string [] { "fdAT" };
this.ChunkLoadBehaviour = Hjg.Pngcs.Chunks.ChunkLoadBehaviour.LOAD_CHUNK_ALWAYS;
byte [] pngid = new byte [ 8 ];
PngHelperInternal.ReadBytes ( inputStream, pngid, 0, pngid.Length );
offset += pngid.Length;
if ( !PngCsUtils.arraysEqual ( pngid, PngHelperInternal.PNG_ID_SIGNATURE ) )
throw new PngjInputException ( "Bad PNG signature" );
CurrentChunkGroup = ChunksList.CHUNK_GROUP_0_IDHR;
int clen = PngHelperInternal.ReadInt4 ( inputStream );
offset += 4;
if ( clen != 13 )
throw new Exception ( "IDHR chunk len != 13 ?? " + clen );
byte [] chunkid = new byte [ 4 ];
PngHelperInternal.ReadBytes ( inputStream, chunkid, 0, 4 );
if ( !PngCsUtils.arraysEqual4 ( chunkid, ChunkHelper.b_IHDR ) )
throw new PngjInputException ( "IHDR not found as first chunk??? ["
+ ChunkHelper.ToString ( chunkid ) + "]" );
offset += 4;
PngChunkIHDR ihdr = ( PngChunkIHDR ) ReadChunk ( chunkid, clen, false );
bool alpha = ( ihdr.Colormodel & 0x04 ) != 0;
bool palette = ( ihdr.Colormodel & 0x01 ) != 0;
bool grayscale = ( ihdr.Colormodel == 0 || ihdr.Colormodel == 4 );
ImgInfo = new ImageInfo ( ihdr.Cols, ihdr.Rows, ihdr.Bitspc, alpha, grayscale, palette );
rowb = new byte [ ImgInfo.BytesPerRow + 1 ];
rowbprev = new byte [ rowb.Length ];
rowbfilter = new byte [ rowb.Length ];
interlaced = ihdr.Interlaced == 1;
deinterlacer = interlaced ? new PngDeinterlacer ( ImgInfo ) : null;
if ( ihdr.Filmeth != 0 || ihdr.Compmeth != 0 || ( ihdr.Interlaced & 0xFFFE ) != 0 )
throw new PngjInputException ( "compmethod or filtermethod or interlaced unrecognized" );
if ( ihdr.Colormodel < 0 || ihdr.Colormodel > 6 || ihdr.Colormodel == 1
|| ihdr.Colormodel == 5 )
throw new PngjInputException ( "Invalid colormodel " + ihdr.Colormodel );
if ( ihdr.Bitspc != 1 && ihdr.Bitspc != 2 && ihdr.Bitspc != 4 && ihdr.Bitspc != 8
&& ihdr.Bitspc != 16 )
throw new PngjInputException ( "Invalid bit depth " + ihdr.Bitspc );
}
private readonly bool ReadOnly; // readonly
internal PngMetadata(ChunksList chunks)
{
chunkList = chunks;
ReadOnly = !(chunks is ChunksListForWrite);
}
public List <PngChunk> GetQueuedById(string id, string innerid)
{
return(ChunksList.GetXById(queuedChunks, id, innerid));
}
