111 lines
2.9 KiB
Java
111 lines
2.9 KiB
Java
package ar.com.hjg.pngj.chunks;
|
|
|
|
import java.io.ByteArrayOutputStream;
|
|
import java.io.IOException;
|
|
|
|
import ar.com.hjg.pngj.ImageInfo;
|
|
import ar.com.hjg.pngj.PngjException;
|
|
|
|
/**
|
|
* iTXt chunk.
|
|
* <p>
|
|
* see http://www.w3.org/TR/PNG/#11iTXt
|
|
*/
|
|
public class PngChunkITXT extends PngChunkTextVar {
|
|
public final static String ID = ChunkHelper.iTXt;
|
|
|
|
private boolean compressed = false;
|
|
private String langTag = "";
|
|
private String translatedTag = "";
|
|
|
|
// http://www.w3.org/TR/PNG/#11iTXt
|
|
public PngChunkITXT(ImageInfo info) {
|
|
super(ID, info);
|
|
}
|
|
|
|
@Override
|
|
public ChunkRaw createRawChunk() {
|
|
if (key == null || key.trim().length() == 0)
|
|
throw new PngjException("Text chunk key must be non empty");
|
|
try {
|
|
ByteArrayOutputStream ba = new ByteArrayOutputStream();
|
|
ba.write(ChunkHelper.toBytes(key));
|
|
ba.write(0); // separator
|
|
ba.write(compressed ? 1 : 0);
|
|
ba.write(0); // compression method (always 0)
|
|
ba.write(ChunkHelper.toBytes(langTag));
|
|
ba.write(0); // separator
|
|
ba.write(ChunkHelper.toBytesUTF8(translatedTag));
|
|
ba.write(0); // separator
|
|
byte[] textbytes = ChunkHelper.toBytesUTF8(val);
|
|
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 parseFromRaw(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 = ChunkHelper.toString(c.data, 0, nullsIdx[0]);
|
|
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 = ChunkHelper.toString(c.data, i, nullsIdx[1] - i);
|
|
translatedTag = ChunkHelper.toStringUTF8(c.data, nullsIdx[1] + 1, nullsIdx[2] - nullsIdx[1] - 1);
|
|
i = nullsIdx[2] + 1;
|
|
if (compressed) {
|
|
byte[] bytes = ChunkHelper.compressBytes(c.data, i, c.data.length - i, false);
|
|
val = ChunkHelper.toStringUTF8(bytes);
|
|
} else {
|
|
val = ChunkHelper.toStringUTF8(c.data, i, c.data.length - i);
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|