internal int WriteChunks(IO.Stream os, int currentGroup) { List <int> written = new List <int>(); for (int i = 0; i < queuedChunks.Count; i++) { PngChunk chunk = queuedChunks[i]; if (!ShouldWrite(chunk, currentGroup)) { continue; } if (ChunkHelper.IsCritical(chunk.Id) && !chunk.Id.Equals(ChunkHelper.PLTE)) { throw new System.IO.IOException($"bad chunk queued: {chunk}"); } if (alreadyWrittenKeys.ContainsKey(chunk.Id) && !chunk.AllowsMultiple()) { throw new System.IO.IOException($"duplicated chunk does not allow multiple: {chunk}"); } chunk.Write(os); chunks.Add(chunk); alreadyWrittenKeys[chunk.Id] = alreadyWrittenKeys.ContainsKey(chunk.Id) ? alreadyWrittenKeys[chunk.Id] + 1 : 1; written.Add(i); chunk.ChunkGroup = currentGroup; } for (int k = written.Count - 1; k != -1; k--) { queuedChunks.RemoveAt(written[k]); } return(written.Count); }
public override ChunkRaw CreateRawChunk() { if (key.Length == 0) { throw new PngjException("Text chunk key must be non empty"); } MemoryStream ba = new MemoryStream(); ChunkHelper.WriteBytesToStream(ba, ChunkHelper.ToBytes(key)); ba.WriteByte(0); // separator ba.WriteByte(compressed ? (byte)1 : (byte)0); ba.WriteByte(0); // compression method (always 0) ChunkHelper.WriteBytesToStream(ba, ChunkHelper.ToBytes(langTag)); ba.WriteByte(0); // separator ChunkHelper.WriteBytesToStream(ba, ChunkHelper.ToBytesUTF8(translatedTag)); ba.WriteByte(0); // separator byte[] textbytes = ChunkHelper.ToBytesUTF8(val); if (compressed) { textbytes = ChunkHelper.compressBytes(textbytes, true); } ChunkHelper.WriteBytesToStream(ba, textbytes); byte[] b = ba.ToArray(); ChunkRaw chunk = createEmptyChunk(b.Length, false); chunk.Data = b; return(chunk); }
public override void ParseFromRaw(ChunkRaw c) { int nullsep = -1; for (int i = 0; i < c.Data.Length; i++) // look for first zero { if (c.Data[i] != 0) { continue; } nullsep = i; break; } if (nullsep < 0 || nullsep > c.Data.Length - 2) { throw new PngjException("bad zTXt chunk: no separator found"); } key = ChunkHelper.ToString(c.Data, 0, nullsep); int compmet = (int)c.Data[nullsep + 1]; if (compmet != 0) { throw new PngjException("bad zTXt chunk: unknown compression method"); } byte[] uncomp = ChunkHelper.compressBytes(c.Data, nullsep + 2, c.Data.Length - nullsep - 2, false); // uncompress val = ChunkHelper.ToString(uncomp); }
internal int writeChunks(Stream os, int currentGroup) { List <int> written = new List <int>(); for (int i = 0; i < queuedChunks.Count; i++) { PngChunk c = queuedChunks[i]; if (!shouldWrite(c, currentGroup)) { continue; } if (ChunkHelper.IsCritical(c.Id) && !c.Id.Equals(ChunkHelper.PLTE)) { throw new PngjOutputException("bad chunk queued: " + c); } if (alreadyWrittenKeys.ContainsKey(c.Id) && !c.AllowsMultiple()) { throw new PngjOutputException("duplicated chunk does not allow multiple: " + c); } c.write(os); chunks.Add(c); alreadyWrittenKeys[c.Id] = alreadyWrittenKeys.ContainsKey(c.Id) ? alreadyWrittenKeys[c.Id] + 1 : 1; written.Add(i); c.ChunkGroup = currentGroup; } for (int k = written.Count - 1; k >= 0; k--) { queuedChunks.RemoveAt(written[k]); } return(written.Count); }
public override ChunkRaw CreateRawChunk() { MemoryStream ba = new MemoryStream(); ChunkHelper.WriteBytesToStream(ba, ChunkHelper.ToBytes(PalName)); ba.WriteByte(0); // separator ba.WriteByte((byte)SampleDepth); int nentries = GetNentries(); for (int n = 0; n < nentries; n++) { for (int i = 0; i < 4; i++) { if (SampleDepth == 8) { PngHelperInternal.WriteByte(ba, (byte)Palette[n * 5 + i]); } else { PngHelperInternal.WriteInt2(ba, Palette[n * 5 + i]); } } PngHelperInternal.WriteInt2(ba, Palette[n * 5 + 4]); } byte[] b = ba.ToArray(); ChunkRaw chunk = createEmptyChunk(b.Length, false); chunk.Data = b; return(chunk); }
internal static PngChunk Factory(ChunkRaw chunk, ImageInfo info) { PngChunk c = FactoryFromId(ChunkHelper.ToString(chunk.IdBytes), info); c.Length = chunk.Len; c.ParseFromRaw(chunk); return(c); }
public override void ParseFromRaw(ChunkRaw chunk) { byte[] data = chunk.Data; int length = data.Length; int t = -1; for (int i = 0; i < length; i++) // look for first zero { if (data[i] == 0) { t = i; break; } } if (t <= 0 || t > length - 2) { throw new System.Exception("bad sPLT chunk: no separator found"); } PalName = ChunkHelper.ToString(data, 0, t); SampleDepth = PngHelperInternal.ReadInt1fromByte(data, t + 1); t += 2; int nentries = (length - t) / (SampleDepth == 8 ? 6 : 10); Palette = new int[nentries * 5]; int r, g, b, a, f, ne; ne = 0; for (int i = 0; i < nentries; i++) { if (SampleDepth == 8) { r = PngHelperInternal.ReadInt1fromByte(data, t++); g = PngHelperInternal.ReadInt1fromByte(data, t++); b = PngHelperInternal.ReadInt1fromByte(data, t++); a = PngHelperInternal.ReadInt1fromByte(data, t++); } else { r = PngHelperInternal.ReadInt2fromBytes(data, t); t += 2; g = PngHelperInternal.ReadInt2fromBytes(data, t); t += 2; b = PngHelperInternal.ReadInt2fromBytes(data, t); t += 2; a = PngHelperInternal.ReadInt2fromBytes(data, t); t += 2; } f = PngHelperInternal.ReadInt2fromBytes(data, t); t += 2; Palette[ne++] = r; Palette[ne++] = g; Palette[ne++] = b; Palette[ne++] = a; Palette[ne++] = f; } }
internal static List <PngChunk> GetXById(List <PngChunk> list, string id, string innerid) { if (innerid == null) { return(ChunkHelper.FilterList(list, new ChunkPredicateId(id))); } else { return(ChunkHelper.FilterList(list, new ChunkPredicateId2(id, innerid))); } }
/// <summary> /// Creates an empty raw chunk /// </summary> internal ChunkRaw(int length, string idb, bool alloc) { Id = idb; IdBytes = ChunkHelper.ToBytes(Id); Data = null; crcval = 0; Len = length; if (alloc) { AllocData(); } }
/// <summary> /// Creates an empty raw chunk /// </summary> internal ChunkRaw(int length, string idb, bool alloc) { this.Id = idb; this.IdBytes = ChunkHelper.ToBytes(Id); this.Data = null; this.crcval = 0; this.Len = length; if (alloc) { AllocData(); } }
/// <summary> /// Constructs an empty chunk /// </summary> /// <param name="id"></param> /// <param name="imgInfo"></param> protected PngChunk(string id, ImageInfo imgInfo) { Id = id; ImgInfo = imgInfo; Crit = ChunkHelper.IsCritical(id); Pub = ChunkHelper.IsPublic(id); Safe = ChunkHelper.IsSafeToCopy(id); Priority = false; ChunkGroup = -1; Length = -1; Offset = 0; }
/// <summary>Queues the chunk at the writer</summary> /// <param name="chunk">Chunk, ready for write</param> /// <param name="lazyOverwrite">Ovewrite lazily equivalent chunks</param> /// <remarks>Warning: the overwriting applies to equivalent chunks, see <c>ChunkPredicateEquiv</c> /// and will only make sense for queued (not yet writen) chunks /// </remarks> public void QueueChunk(PngChunk chunk, bool lazyOverwrite) { ChunksListForWrite cl = getChunkListW(); if (ReadOnly) { throw new PngjException("cannot set chunk : readonly metadata"); } if (lazyOverwrite) { ChunkHelper.TrimList(cl.GetQueuedChunks(), new ChunkPredicateEquiv(chunk)); } cl.Queue(chunk); }
public override void ParseFromRaw(ChunkRaw chunk) { byte[] data = chunk.Data; int length = data.Length; int nullsFound = 0; int[] nullsIdx = new int[3]; for (int k = 0; k < length; k++) { if (data[k] != 0) { continue; } nullsIdx[nullsFound] = k; nullsFound++; if (nullsFound == 1) { k += 2; } if (nullsFound == 3) { break; } } if (nullsFound != 3) { throw new System.Exception("Bad formed PngChunkITXT chunk"); } key = ChunkHelper.ToString(data, 0, nullsIdx[0]); int i = nullsIdx[0] + 1; compressed = data[i] == 0 ? false : true; i++; if (compressed && data[i] != 0) { throw new System.Exception("Bad formed PngChunkITXT chunk - bad compression method "); } langTag = ChunkHelper.ToString(data, i, nullsIdx[1] - i); translatedTag = ChunkHelper.ToStringUTF8(data, nullsIdx[1] + 1, nullsIdx[2] - nullsIdx[1] - 1); i = nullsIdx[2] + 1; if (compressed) { byte[] bytes = ChunkHelper.CompressBytes(data, i, length - i, false); val = ChunkHelper.ToStringUTF8(bytes); } else { val = ChunkHelper.ToStringUTF8(data, i, length - i); } }
/** * this should be called only for ancillary chunks and PLTE (groups 1 - 3 - 5) **/ static bool ShouldWrite(PngChunk chunk, int currentGroup) { if (currentGroup == CHUNK_GROUP_2_PLTE) { return(chunk.Id.Equals(ChunkHelper.PLTE)); } if (currentGroup % 2 == 0) { throw new System.IO.IOException("bad chunk group?"); } int minChunkGroup, maxChunkGroup; if (chunk.MustGoBeforePLTE()) { minChunkGroup = maxChunkGroup = ChunksList.CHUNK_GROUP_1_AFTERIDHR; } else if (chunk.MustGoBeforeIDAT()) { maxChunkGroup = ChunksList.CHUNK_GROUP_3_AFTERPLTE; minChunkGroup = chunk.MustGoAfterPLTE() ? ChunksList.CHUNK_GROUP_3_AFTERPLTE : ChunksList.CHUNK_GROUP_1_AFTERIDHR; } else { maxChunkGroup = ChunksList.CHUNK_GROUP_5_AFTERIDAT; minChunkGroup = ChunksList.CHUNK_GROUP_1_AFTERIDHR; } int preferred = maxChunkGroup; if (chunk.Priority) { preferred = minChunkGroup; } if (ChunkHelper.IsUnknown(chunk) && chunk.ChunkGroup > 0) { preferred = chunk.ChunkGroup; } if (currentGroup == preferred) { return(true); } if (currentGroup > preferred && currentGroup <= maxChunkGroup) { return(true); } return(false); }
internal void WriteChunk(Stream os) { if (IdBytes.Length != 4) { throw new PngjOutputException("bad chunkid [" + ChunkHelper.ToString(IdBytes) + "]"); } crcval = ComputeCrc(); PngHelperInternal.WriteInt4(os, Len); PngHelperInternal.WriteBytes(os, IdBytes); if (Len > 0) { PngHelperInternal.WriteBytes(os, Data, 0, Len); } //Console.WriteLine("writing chunk " + this.ToString() + "crc=" + crcval); PngHelperInternal.WriteInt4(os, crcval); }
public override ChunkRaw CreateRawChunk() { if (key.Length == 0) { throw new PngjException("Text chunk key must be non empty"); } MemoryStream ba = new MemoryStream(); ChunkHelper.WriteBytesToStream(ba, ChunkHelper.ToBytes(key)); ba.WriteByte(0); // separator ba.WriteByte(0); // compression method: 0 byte[] textbytes = ChunkHelper.compressBytes(ChunkHelper.ToBytes(val), true); ChunkHelper.WriteBytesToStream(ba, textbytes); byte[] b = ba.ToArray(); ChunkRaw chunk = createEmptyChunk(b.Length, false); chunk.Data = b; return(chunk); }
/// <summary> /// Sets profile name and profile /// </summary> /// <param name="name">profile name </param> /// <param name="profile">profile (latin1 string)</param> public void SetProfileNameAndContent(String name, String profile) { SetProfileNameAndContent(name, ChunkHelper.ToBytes(profileName)); }
public String GetProfileAsString() { return(ChunkHelper.ToString(GetProfile())); }
/// <summary> /// This uncompresses the string! /// </summary> /// <returns></returns> public byte[] GetProfile() { return(ChunkHelper.compressBytes(compressedProfile, false)); }
/// <summary> /// Sets profile name and profile /// </summary> /// <param name="name">profile name </param> /// <param name="profile">profile (uncompressed)</param> public void SetProfileNameAndContent(String name, byte[] profile) { profileName = name; compressedProfile = ChunkHelper.compressBytes(profile, true); }
/// <summary> /// Finds all chunks "equivalent" to this one /// </summary> /// <param name="chunk"></param> /// <returns>Empty if nothing found</returns> public List <PngChunk> GetEquivalent(PngChunk chunk) { return(ChunkHelper.FilterList(chunks, new ChunkPredicateEquiv(chunk))); }
internal ChunkRaw(int length, byte[] idbytes, bool alloc) : this(length, ChunkHelper.ToString(idbytes), alloc) { }
/// <summary> /// Just id and length /// </summary> /// <returns></returns> public override string ToString() { return("chunkid=" + ChunkHelper.ToString(IdBytes) + " len=" + Len); }
/// <summary> /// Check for match /// </summary> /// <param name="c"></param> /// <returns></returns> public bool Matches(PngChunk c) { return(ChunkHelper.Equivalent(c, chunk)); }
public ChunkRaw createEmptyChunk(int len, bool alloc) { ChunkRaw c = new ChunkRaw(len, ChunkHelper.ToBytes(Id), alloc); return(c); }