/// <exception cref="PngProcessingException"/> /// <exception cref="System.IO.IOException"/> private static IEnumerable <Directory> ProcessChunk([NotNull] PngChunk chunk) { var chunkType = chunk.ChunkType; var bytes = chunk.Bytes; if (chunkType == PngChunkType.IHDR) { var header = new PngHeader(bytes); var directory = new PngDirectory(PngChunkType.IHDR); directory.Set(PngDirectory.TagImageWidth, header.ImageWidth); directory.Set(PngDirectory.TagImageHeight, header.ImageHeight); directory.Set(PngDirectory.TagBitsPerSample, header.BitsPerSample); directory.Set(PngDirectory.TagColorType, header.ColorType.NumericValue); directory.Set(PngDirectory.TagCompressionType, header.CompressionType); directory.Set(PngDirectory.TagFilterMethod, header.FilterMethod); directory.Set(PngDirectory.TagInterlaceMethod, header.InterlaceMethod); yield return(directory); } else if (chunkType == PngChunkType.PLTE) { var directory = new PngDirectory(PngChunkType.PLTE); directory.Set(PngDirectory.TagPaletteSize, bytes.Length / 3); yield return(directory); } else if (chunkType == PngChunkType.tRNS) { var directory = new PngDirectory(PngChunkType.tRNS); directory.Set(PngDirectory.TagPaletteHasTransparency, 1); yield return(directory); } else if (chunkType == PngChunkType.sRGB) { int srgbRenderingIntent = unchecked ((sbyte)bytes[0]); var directory = new PngDirectory(PngChunkType.sRGB); directory.Set(PngDirectory.TagSrgbRenderingIntent, srgbRenderingIntent); yield return(directory); } else if (chunkType == PngChunkType.cHRM) { var chromaticities = new PngChromaticities(bytes); var directory = new PngChromaticitiesDirectory(); directory.Set(PngChromaticitiesDirectory.TagWhitePointX, chromaticities.WhitePointX); directory.Set(PngChromaticitiesDirectory.TagWhitePointY, chromaticities.WhitePointY); directory.Set(PngChromaticitiesDirectory.TagRedX, chromaticities.RedX); directory.Set(PngChromaticitiesDirectory.TagRedY, chromaticities.RedY); directory.Set(PngChromaticitiesDirectory.TagGreenX, chromaticities.GreenX); directory.Set(PngChromaticitiesDirectory.TagGreenY, chromaticities.GreenY); directory.Set(PngChromaticitiesDirectory.TagBlueX, chromaticities.BlueX); directory.Set(PngChromaticitiesDirectory.TagBlueY, chromaticities.BlueY); yield return(directory); } else if (chunkType == PngChunkType.gAMA) { var gammaInt = ByteConvert.ToInt32BigEndian(bytes); var directory = new PngDirectory(PngChunkType.gAMA); directory.Set(PngDirectory.TagGamma, gammaInt / 100000.0); yield return(directory); } else if (chunkType == PngChunkType.iCCP) { var reader = new SequentialByteArrayReader(bytes); var profileName = reader.GetNullTerminatedString(maxLengthBytes: 79); var directory = new PngDirectory(PngChunkType.iCCP); directory.Set(PngDirectory.TagIccProfileName, profileName); var compressionMethod = reader.GetSByte(); if (compressionMethod == 0) { // Only compression method allowed by the spec is zero: deflate // This assumes 1-byte-per-char, which it is by spec. var bytesLeft = bytes.Length - profileName.Length - 2; var compressedProfile = reader.GetBytes(bytesLeft); using (var inflaterStream = new InflaterInputStream(new MemoryStream(compressedProfile))) yield return(new IccReader().Extract(new IndexedCapturingReader(inflaterStream))); } else { directory.AddError("Invalid compression method value"); } yield return(directory); } else if (chunkType == PngChunkType.bKGD) { var directory = new PngDirectory(PngChunkType.bKGD); directory.Set(PngDirectory.TagBackgroundColor, bytes); yield return(directory); } else if (chunkType == PngChunkType.tEXt) { var reader = new SequentialByteArrayReader(bytes); var keyword = reader.GetNullTerminatedString(maxLengthBytes: 79); var bytesLeft = bytes.Length - keyword.Length - 1; var value = reader.GetNullTerminatedString(bytesLeft); var textPairs = new List <KeyValuePair> { new KeyValuePair(keyword, value) }; var directory = new PngDirectory(PngChunkType.iTXt); directory.Set(PngDirectory.TagTextualData, textPairs); yield return(directory); } else if (chunkType == PngChunkType.iTXt) { var reader = new SequentialByteArrayReader(bytes); var keyword = reader.GetNullTerminatedString(maxLengthBytes: 79); var compressionFlag = reader.GetSByte(); var compressionMethod = reader.GetSByte(); var languageTag = reader.GetNullTerminatedString(bytes.Length); var translatedKeyword = reader.GetNullTerminatedString(bytes.Length); var bytesLeft = bytes.Length - keyword.Length - 1 - 1 - 1 - languageTag.Length - 1 - translatedKeyword.Length - 1; string text = null; if (compressionFlag == 0) { text = reader.GetNullTerminatedString(bytesLeft); } else if (compressionFlag == 1) { if (compressionMethod == 0) { using (var inflaterStream = new DeflateStream(new MemoryStream(bytes, bytes.Length - bytesLeft, bytesLeft), CompressionMode.Decompress)) text = new StreamReader(inflaterStream).ReadToEnd(); } else { var directory = new PngDirectory(PngChunkType.iTXt); directory.AddError("Invalid compression method value"); yield return(directory); } } else { var directory = new PngDirectory(PngChunkType.iTXt); directory.AddError("Invalid compression flag value"); yield return(directory); } if (text != null) { if (keyword == "XML:com.adobe.xmp") { // NOTE in testing images, the XMP has parsed successfully, but we are not extracting tags from it as necessary yield return(new XmpReader().Extract(text)); } else { var textPairs = new List <KeyValuePair> { new KeyValuePair(keyword, text) }; var directory = new PngDirectory(PngChunkType.iTXt); directory.Set(PngDirectory.TagTextualData, textPairs); yield return(directory); } } } else if (chunkType == PngChunkType.tIME) { var reader = new SequentialByteArrayReader(bytes); var year = reader.GetUInt16(); var month = reader.GetByte(); int day = reader.GetByte(); int hour = reader.GetByte(); int minute = reader.GetByte(); int second = reader.GetByte(); var directory = new PngDirectory(PngChunkType.tIME); try { var time = new DateTime(year, month, day, hour, minute, second, DateTimeKind.Utc); directory.Set(PngDirectory.TagLastModificationTime, time); } catch (ArgumentOutOfRangeException e) { directory.AddError("Error constructing DateTime: " + e.Message); } yield return(directory); } else if (chunkType == PngChunkType.pHYs) { var reader = new SequentialByteArrayReader(bytes); var pixelsPerUnitX = reader.GetInt32(); var pixelsPerUnitY = reader.GetInt32(); var unitSpecifier = reader.GetSByte(); var directory = new PngDirectory(PngChunkType.pHYs); directory.Set(PngDirectory.TagPixelsPerUnitX, pixelsPerUnitX); directory.Set(PngDirectory.TagPixelsPerUnitY, pixelsPerUnitY); directory.Set(PngDirectory.TagUnitSpecifier, unitSpecifier); yield return(directory); } else if (chunkType.Equals(PngChunkType.sBIT)) { var directory = new PngDirectory(PngChunkType.sBIT); directory.Set(PngDirectory.TagSignificantBits, bytes); yield return(directory); } }
/// <exception cref="Com.Drew.Imaging.Png.PngProcessingException"/> /// <exception cref="System.IO.IOException"/> private static void ProcessChunk([NotNull] Com.Drew.Metadata.Metadata metadata, [NotNull] PngChunk chunk) { PngChunkType chunkType = chunk.GetChunkType(); sbyte[] bytes = chunk.GetBytes(); if (chunkType.Equals(PngChunkType.Ihdr)) { PngHeader header = new PngHeader(bytes); PngDirectory directory = new PngDirectory(PngChunkType.Ihdr); directory.SetInt(PngDirectory.TagImageWidth, header.GetImageWidth()); directory.SetInt(PngDirectory.TagImageHeight, header.GetImageHeight()); directory.SetInt(PngDirectory.TagBitsPerSample, header.GetBitsPerSample()); directory.SetInt(PngDirectory.TagColorType, header.GetColorType().GetNumericValue()); directory.SetInt(PngDirectory.TagCompressionType, header.GetCompressionType()); directory.SetInt(PngDirectory.TagFilterMethod, header.GetFilterMethod()); directory.SetInt(PngDirectory.TagInterlaceMethod, header.GetInterlaceMethod()); metadata.AddDirectory(directory); } else { if (chunkType.Equals(PngChunkType.Plte)) { PngDirectory directory = new PngDirectory(PngChunkType.Plte); directory.SetInt(PngDirectory.TagPaletteSize, bytes.Length / 3); metadata.AddDirectory(directory); } else { if (chunkType.Equals(PngChunkType.tRNS)) { PngDirectory directory = new PngDirectory(PngChunkType.tRNS); directory.SetInt(PngDirectory.TagPaletteHasTransparency, 1); metadata.AddDirectory(directory); } else { if (chunkType.Equals(PngChunkType.sRGB)) { int srgbRenderingIntent = new SequentialByteArrayReader(bytes).GetInt8(); PngDirectory directory = new PngDirectory(PngChunkType.sRGB); directory.SetInt(PngDirectory.TagSrgbRenderingIntent, srgbRenderingIntent); metadata.AddDirectory(directory); } else { if (chunkType.Equals(PngChunkType.cHRM)) { PngChromaticities chromaticities = new PngChromaticities(bytes); PngChromaticitiesDirectory directory = new PngChromaticitiesDirectory(); directory.SetInt(PngChromaticitiesDirectory.TagWhitePointX, chromaticities.GetWhitePointX()); directory.SetInt(PngChromaticitiesDirectory.TagWhitePointX, chromaticities.GetWhitePointX()); directory.SetInt(PngChromaticitiesDirectory.TagRedX, chromaticities.GetRedX()); directory.SetInt(PngChromaticitiesDirectory.TagRedY, chromaticities.GetRedY()); directory.SetInt(PngChromaticitiesDirectory.TagGreenX, chromaticities.GetGreenX()); directory.SetInt(PngChromaticitiesDirectory.TagGreenY, chromaticities.GetGreenY()); directory.SetInt(PngChromaticitiesDirectory.TagBlueX, chromaticities.GetBlueX()); directory.SetInt(PngChromaticitiesDirectory.TagBlueY, chromaticities.GetBlueY()); metadata.AddDirectory(directory); } else { if (chunkType.Equals(PngChunkType.gAMA)) { int gammaInt = new SequentialByteArrayReader(bytes).GetInt32(); PngDirectory directory = new PngDirectory(PngChunkType.gAMA); directory.SetDouble(PngDirectory.TagGamma, gammaInt / 100000.0); metadata.AddDirectory(directory); } else { if (chunkType.Equals(PngChunkType.iCCP)) { SequentialReader reader = new SequentialByteArrayReader(bytes); string profileName = reader.GetNullTerminatedString(79); PngDirectory directory = new PngDirectory(PngChunkType.iCCP); directory.SetString(PngDirectory.TagIccProfileName, profileName); sbyte compressionMethod = reader.GetInt8(); if (compressionMethod == 0) { // Only compression method allowed by the spec is zero: deflate // This assumes 1-byte-per-char, which it is by spec. int bytesLeft = bytes.Length - profileName.Length - 2; sbyte[] compressedProfile = reader.GetBytes(bytesLeft); InflaterInputStream inflateStream = new InflaterInputStream(new ByteArrayInputStream(compressedProfile)); new IccReader().Extract(new RandomAccessStreamReader(inflateStream), metadata); inflateStream.Close(); } metadata.AddDirectory(directory); } else { if (chunkType.Equals(PngChunkType.bKGD)) { PngDirectory directory = new PngDirectory(PngChunkType.bKGD); directory.SetByteArray(PngDirectory.TagBackgroundColor, bytes); metadata.AddDirectory(directory); } else { if (chunkType.Equals(PngChunkType.tEXt)) { SequentialReader reader = new SequentialByteArrayReader(bytes); string keyword = reader.GetNullTerminatedString(79); int bytesLeft = bytes.Length - keyword.Length - 1; string value = reader.GetNullTerminatedString(bytesLeft); IList <KeyValuePair> textPairs = new AList <KeyValuePair>(); textPairs.Add(new KeyValuePair(keyword, value)); PngDirectory directory = new PngDirectory(PngChunkType.iTXt); directory.SetObject(PngDirectory.TagTextualData, textPairs); metadata.AddDirectory(directory); } else { if (chunkType.Equals(PngChunkType.iTXt)) { SequentialReader reader = new SequentialByteArrayReader(bytes); string keyword = reader.GetNullTerminatedString(79); sbyte compressionFlag = reader.GetInt8(); sbyte compressionMethod = reader.GetInt8(); string languageTag = reader.GetNullTerminatedString(bytes.Length); string translatedKeyword = reader.GetNullTerminatedString(bytes.Length); int bytesLeft = bytes.Length - keyword.Length - 1 - 1 - 1 - languageTag.Length - 1 - translatedKeyword.Length - 1; string text = null; if (compressionFlag == 0) { text = reader.GetNullTerminatedString(bytesLeft); } else { if (compressionFlag == 1) { if (compressionMethod == 0) { text = StringUtil.FromStream(new InflaterInputStream(new ByteArrayInputStream(bytes, bytes.Length - bytesLeft, bytesLeft))); } else { PngDirectory directory = new PngDirectory(PngChunkType.iTXt); directory.AddError("Invalid compression method value"); metadata.AddDirectory(directory); } } else { PngDirectory directory = new PngDirectory(PngChunkType.iTXt); directory.AddError("Invalid compression flag value"); metadata.AddDirectory(directory); } } if (text != null) { if (keyword.Equals("XML:com.adobe.xmp")) { // NOTE in testing images, the XMP has parsed successfully, but we are not extracting tags from it as necessary new XmpReader().Extract(text, metadata); } else { IList <KeyValuePair> textPairs = new AList <KeyValuePair>(); textPairs.Add(new KeyValuePair(keyword, text)); PngDirectory directory = new PngDirectory(PngChunkType.iTXt); directory.SetObject(PngDirectory.TagTextualData, textPairs); metadata.AddDirectory(directory); } } } else { if (chunkType.Equals(PngChunkType.tIME)) { SequentialByteArrayReader reader = new SequentialByteArrayReader(bytes); int year = reader.GetUInt16(); int month = reader.GetUInt8() - 1; int day = reader.GetUInt8(); int hour = reader.GetUInt8(); int minute = reader.GetUInt8(); int second = reader.GetUInt8(); Sharpen.Calendar calendar = Sharpen.Calendar.GetInstance(Sharpen.Extensions.GetTimeZone("UTC")); //noinspection MagicConstant calendar.Set(year, month, day, hour, minute, second); PngDirectory directory = new PngDirectory(PngChunkType.tIME); directory.SetDate(PngDirectory.TagLastModificationTime, calendar.GetTime()); metadata.AddDirectory(directory); } else { if (chunkType.Equals(PngChunkType.pHYs)) { SequentialByteArrayReader reader = new SequentialByteArrayReader(bytes); int pixelsPerUnitX = reader.GetInt32(); int pixelsPerUnitY = reader.GetInt32(); sbyte unitSpecifier = reader.GetInt8(); PngDirectory directory = new PngDirectory(PngChunkType.pHYs); directory.SetInt(PngDirectory.TagPixelsPerUnitX, pixelsPerUnitX); directory.SetInt(PngDirectory.TagPixelsPerUnitY, pixelsPerUnitY); directory.SetInt(PngDirectory.TagUnitSpecifier, unitSpecifier); metadata.AddDirectory(directory); } else { if (chunkType.Equals(PngChunkType.sBIT)) { PngDirectory directory = new PngDirectory(PngChunkType.sBIT); directory.SetByteArray(PngDirectory.TagSignificantBits, bytes); metadata.AddDirectory(directory); } } } } } } } } } } } } } }