content: /*
   ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
   ~                                                                               ~
   ~ The MIT License (MIT)                                                         ~
   ~                                                                               ~
   ~ Copyright (c) 2015-2025 miaixz.org and other contributors.                    ~
   ~                                                                               ~
   ~ Permission is hereby granted, free of charge, to any person obtaining a copy  ~
   ~ of this software and associated documentation files (the "Software"), to deal ~
   ~ in the Software without restriction, including without limitation the rights  ~
   ~ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell     ~
   ~ copies of the Software, and to permit persons to whom the Software is         ~
   ~ furnished to do so, subject to the following conditions:                      ~
   ~                                                                               ~
   ~ The above copyright notice and this permission notice shall be included in    ~
   ~ all copies or substantial portions of the Software.                           ~
   ~                                                                               ~
   ~ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR    ~
   ~ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,      ~
   ~ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE   ~
   ~ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER        ~
   ~ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, ~
   ~ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN     ~
   ~ THE SOFTWARE.                                                                 ~
   ~                                                                               ~
   ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
  */
  package org.miaixz.bus.image.nimble.codec.jpeg;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.util.Arrays;
  
  import javax.imageio.stream.ImageInputStream;
  import javax.imageio.stream.ImageInputStreamImpl;
  
  import org.miaixz.bus.image.nimble.codec.BytesWithImageImageDescriptor;
  import org.miaixz.bus.image.nimble.codec.ImageDescriptor;
  import org.miaixz.bus.image.nimble.stream.EncapsulatedPixelDataImageInputStream;
  import org.miaixz.bus.image.nimble.stream.SegmentedInputImageStream;
  import org.miaixz.bus.logger.Logger;
  
  /**
   * @author Kimi Liu
   * @since Java 17+
   */
  public class PatchJPEGLSInputStream extends ImageInputStreamImpl implements BytesWithImageImageDescriptor {
  
      private final ImageInputStream iis;
      private long patchPos;
      private byte[] patch;
  
      public PatchJPEGLSInputStream(ImageInputStream iis, PatchJPEGLS patchJPEGLS) throws IOException {
          if (iis == null)
              throw new NullPointerException("iis");
  
          super.streamPos = iis.getStreamPosition();
          super.flushedPos = iis.getFlushedPosition();
          this.iis = iis;
          if (patchJPEGLS == null)
              return;
  
          JPEGLSCodingParam param = patchJPEGLS.createJPEGLSCodingParam(firstBytesOf(iis));
          if (param != null) {
              Logger.debug("Patch JPEG-LS with {}", param);
              this.patchPos = streamPos + param.getOffset();
              this.patch = param.getBytes();
          }
      }
  
      @Override
      public ImageDescriptor getImageDescriptor() {
          return (iis instanceof EncapsulatedPixelDataImageInputStream)
                  ? ((EncapsulatedPixelDataImageInputStream) iis).getImageDescriptor()
                  : (iis instanceof SegmentedInputImageStream) ? ((SegmentedInputImageStream) iis).getImageDescriptor()
                          : null;
      }
  
      private byte[] firstBytesOf(ImageInputStream iis) throws IOException {
          byte[] b = new byte[256];
          int n, off = 0, len = b.length;
          iis.mark();
          while (len > 0 && (n = iis.read(b, off, len)) > 0) {
              off += n;
              len -= n;
          }
          iis.reset();
          return len > 0 ? Arrays.copyOf(b, b.length - len) : b;
      }
  
      public void close() throws IOException {
          super.close();
          iis.close();
      }
  
      public void flushBefore(long pos) throws IOException {
          super.flushBefore(pos);
          iis.flushBefore(adjustStreamPosition(pos));
      }
  
      private long adjustStreamPosition(long pos) {
          if (patch == null)
              return pos;
          long index = pos - patchPos;
          return index < 0 ? pos : index < patch.length ? patchPos : pos - patch.length;
      }
  
      public boolean isCached() {
          return iis.isCached();
      }
  
      public boolean isCachedFile() {
          return iis.isCachedFile();
      }
  
      public boolean isCachedMemory() {
          return iis.isCachedMemory();
      }
  
      public long length() {
          try {
              long len = iis.length();
              return patch == null || len < 0 ? len : len + patch.length;
          } catch (IOException e) {
              return -1;
          }
      }
  
      public int read() throws IOException {
          int ch;
          long index;
          if (patch != null && (index = streamPos - patchPos) >= 0 && index < patch.length)
              ch = patch[(int) index];
          else
              ch = iis.read();
          if (ch >= 0)
              streamPos++;
          return ch;
      }
  
      public int read(byte[] b, int off, int len) throws IOException {
          int r = 0;
          if (patch != null && streamPos < patchPos + patch.length) {
              if (streamPos < patchPos) {
                  r = iis.read(b, off, (int) Math.min(patchPos - streamPos, len));
                  if (r < 0)
                      return r;
                  streamPos += r;
                  if (streamPos < patchPos)
                      return r;
                  off += r;
                  len -= r;
              }
              int index = (int) (patchPos - streamPos);
              int r2 = Math.min(patch.length - index, len);
              System.arraycopy(patch, index, b, off, r2);
              streamPos += r2;
              r += r2;
              off += r2;
              len -= r2;
          }
          if (len > 0) {
              int r3 = iis.read(b, off, len);
              if (r3 < 0)
                  return r3;
              streamPos += r3;
              r += r3;
          }
          return r;
      }
  
      public void mark() {
          super.mark();
          iis.mark();
      }
  
      public void reset() throws IOException {
          super.reset();
          iis.reset();
      }
  
      public void seek(long pos) throws IOException {
          super.seek(pos);
          iis.seek(adjustStreamPosition(pos));
      }
  
      @Override
      public ByteBuffer getBytes() throws IOException {
          byte[] array = new byte[8192];
          int length = 0;
          int read;
          while ((read = this.read(array, length, array.length - length)) > 0) {
              if ((length += read) == array.length)
                  array = Arrays.copyOf(array, array.length << 1);
          }
          return ByteBuffer.wrap(array, 0, length);
      }
  
  }
  