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 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;
}
}
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);
}
}
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);
}
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);
}
public String GetProfileAsString()
{
return(ChunkHelper.ToString(GetProfile()));
}