73 lines
1.6 KiB
Java
73 lines
1.6 KiB
Java
package ar.com.hjg.pngj.chunks;
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import ar.com.hjg.pngj.ImageInfo;
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import ar.com.hjg.pngj.PngHelperInternal;
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import ar.com.hjg.pngj.PngjException;
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/**
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* fdAT chunk. For APGN, not PGN standard
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* <p>
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* see
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* https://wiki.mozilla.org/APNG_Specification#.60fdAT.60:_The_Frame_Data_Chunk
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* <p>
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* This implementation does not support buffering, this should be not managed
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* similar to a IDAT chunk
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*
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*/
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public class PngChunkFDAT extends PngChunkMultiple {
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public final static String ID = "fdAT";
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private int seqNum;
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private byte[] buffer; // normally not allocated - if so, it's the raw data, so it includes the 4bytes seqNum
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int datalen; // length of idat data, excluding seqNUm (= chunk.len-4)
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public PngChunkFDAT(ImageInfo info) {
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super(ID, info);
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}
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@Override
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public ChunkOrderingConstraint getOrderingConstraint() {
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return ChunkOrderingConstraint.AFTER_IDAT;
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}
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@Override
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public ChunkRaw createRawChunk() {
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if (buffer == null)
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throw new PngjException("not buffered");
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ChunkRaw c = createEmptyChunk(datalen + 4, false);
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c.data = buffer; // shallow copy!
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return c;
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}
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@Override
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public void parseFromRaw(ChunkRaw chunk) {
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seqNum = PngHelperInternal.readInt4fromBytes(chunk.data, 0);
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datalen = chunk.len - 4;
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buffer = chunk.data;
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}
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public int getSeqNum() {
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return seqNum;
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}
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public void setSeqNum(int seqNum) {
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this.seqNum = seqNum;
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}
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public byte[] getBuffer() {
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return buffer;
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}
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public void setBuffer(byte[] buffer) {
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this.buffer = buffer;
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}
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public int getDatalen() {
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return datalen;
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}
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public void setDatalen(int datalen) {
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this.datalen = datalen;
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}
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}
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