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package jogamp.opengl.util.pngj.chunks;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import jogamp.opengl.util.pngj.ImageInfo;
import jogamp.opengl.util.pngj.PngHelper;
import jogamp.opengl.util.pngj.PngjException;
/**
* UNTESTED!
*/
public class PngChunkITXT extends PngChunkTextVar {
private boolean compressed = false;
private String langTag = "";
private String translatedTag = "";
// http://www.w3.org/TR/PNG/#11iTXt
public PngChunkITXT(ImageInfo info) {
super(ChunkHelper.iTXt, info);
}
@Override
public ChunkRaw createChunk() {
if (val.isEmpty() || key.isEmpty())
return null;
try {
ByteArrayOutputStream ba = new ByteArrayOutputStream();
ba.write(key.getBytes(PngHelper.charsetLatin1));
ba.write(0); // separator
ba.write(compressed ? 1 : 0);
ba.write(0); // compression method (always 0)
ba.write(langTag.getBytes(PngHelper.charsetUTF8));
ba.write(0); // separator
ba.write(translatedTag.getBytes(PngHelper.charsetUTF8));
ba.write(0); // separator
byte[] textbytes = val.getBytes(PngHelper.charsetUTF8);
if (compressed) {
textbytes = ChunkHelper.compressBytes(textbytes, true);
}
ba.write(textbytes);
byte[] b = ba.toByteArray();
ChunkRaw chunk = createEmptyChunk(b.length, false);
chunk.data = b;
return chunk;
} catch (IOException e) {
throw new PngjException(e);
}
}
@Override
public void parseFromChunk(ChunkRaw c) {
int nullsFound = 0;
int[] nullsIdx = new int[3];
for (int i = 0; i < c.data.length; i++) {
if (c.data[i] != 0)
continue;
nullsIdx[nullsFound] = i;
nullsFound++;
if (nullsFound == 1)
i += 2;
if (nullsFound == 3)
break;
}
if (nullsFound != 3)
throw new PngjException("Bad formed PngChunkITXT chunk");
key = new String(c.data, 0, nullsIdx[0], PngHelper.charsetLatin1);
int i = nullsIdx[0] + 1;
compressed = c.data[i] == 0 ? false : true;
i++;
if (compressed && c.data[i] != 0)
throw new PngjException("Bad formed PngChunkITXT chunk - bad compression method ");
langTag = new String(c.data, i, nullsIdx[1] - i, PngHelper.charsetLatin1);
translatedTag = new String(c.data, nullsIdx[1] + 1, nullsIdx[2] - nullsIdx[1] - 1, PngHelper.charsetUTF8);
i = nullsIdx[2] + 1;
if (compressed) {
byte[] bytes = ChunkHelper.compressBytes(c.data, i, c.data.length - i, false);
val = new String(bytes, PngHelper.charsetUTF8);
} else {
val = new String(c.data, i, c.data.length - i, PngHelper.charsetUTF8);
}
}
@Override
public void cloneDataFromRead(PngChunk other) {
PngChunkITXT otherx = (PngChunkITXT) other;
key = otherx.key;
val = otherx.val;
compressed = otherx.compressed;
langTag = otherx.langTag;
translatedTag = otherx.translatedTag;
}
public boolean isCompressed() {
return compressed;
}
public void setCompressed(boolean compressed) {
this.compressed = compressed;
}
public String getLangtag() {
return langTag;
}
public void setLangtag(String langtag) {
this.langTag = langtag;
}
public String getTranslatedTag() {
return translatedTag;
}
public void setTranslatedTag(String translatedTag) {
this.translatedTag = translatedTag;
}
}
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