初始提交，滑块验证码功能已实现

2020-06-23 15:24:55 +08:00
commit 5c899a0220
53 changed files with 2936 additions and 0 deletions
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+/*
+ * Copyright 2013 Luciad (http://www.luciad.com)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.luciad.imageio.webp;
+
+import javax.imageio.ImageReader;
+import javax.imageio.spi.ImageReaderSpi;
+import javax.imageio.stream.ImageInputStream;
+import java.io.IOException;
+import java.nio.ByteOrder;
+import java.util.Arrays;
+import java.util.Locale;
+
+/**
+ *
+ */
+public class WebPImageReaderSpi extends ImageReaderSpi {
+  private static final byte[] RIFF = new byte[]{ 'R', 'I', 'F', 'F' };
+  private static final byte[] WEBP = new byte[]{ 'W', 'E', 'B', 'P' };
+  private static final byte[] VP8_ = new byte[]{ 'V', 'P', '8', ' ' };
+  private static final byte[] VP8L = new byte[]{ 'V', 'P', '8', 'L' };
+  private static final byte[] VP8X = new byte[]{ 'V', 'P', '8', 'X' };
+
+  public WebPImageReaderSpi() {
+    super(
+        "Luciad",
+        "1.0",
+        new String[]{ "WebP", "webp" },
+        new String[]{ "webp" },
+        new String[]{ "image/webp" },
+        WebPReader.class.getName(),
+        new Class[] { ImageInputStream.class },
+        new String[]{ WebPImageWriterSpi.class.getName() },
+        false,
+        null,
+        null,
+        null,
+        null,
+        false,
+        null,
+        null,
+        null,
+        null
+    );
+  }
+
+  @Override
+  public ImageReader createReaderInstance( Object extension ) throws IOException {
+    return new WebPReader( this );
+  }
+
+  @Override
+  public boolean canDecodeInput( Object source ) throws IOException {
+    if ( !( source instanceof ImageInputStream ) ) {
+      return false;
+    }
+
+    ImageInputStream stream = ( ImageInputStream ) source;
+    byte[] b = new byte[ 4 ];
+    ByteOrder oldByteOrder = stream.getByteOrder();
+    stream.mark();
+    stream.setByteOrder( ByteOrder.LITTLE_ENDIAN );
+
+    try {
+      stream.readFully( b );
+      if ( !Arrays.equals( b, RIFF ) ) {
+        return false;
+      }
+      long chunkLength = stream.readUnsignedInt();
+      long streamLength = stream.length();
+      if ( streamLength != -1 && streamLength != chunkLength + 8 ) {
+        return false;
+      }
+      stream.readFully( b );
+      if ( !Arrays.equals( b, WEBP ) ) {
+        return false;
+      }
+
+      stream.readFully( b );
+      if ( !Arrays.equals( b, VP8_ ) && !Arrays.equals( b, VP8L ) && !Arrays.equals( b, VP8X ) ) {
+        return false;
+      }
+    } finally {
+      stream.setByteOrder( oldByteOrder );
+      stream.reset();
+    }
+
+    return true;
+  }
+
+  @Override
+  public String getDescription( Locale locale ) {
+    return "WebP Reader";
+  }
+}