add SnappyException/SnappyError

src/main/java/org/xerial/snappy/LoadSnappy.java

@@ -140,8 +140,7 @@ public class LoadSnappy
                 return true;
             }
             catch (UnsatisfiedLinkError e) {
-                System.err.println(e);
-                return false;
+                throw new SnappyError(SnappyErrorCode.FAILED_TO_LOAD_NATIVE_LIBRARY, e);
             }
 
         }

src/main/java/org/xerial/snappy/Snappy.java

@@ -11,6 +11,12 @@ package org.xerial.snappy;
 
 import java.nio.ByteBuffer;
 
+/**
+ * Snappy API
+ * 
+ * @author leo
+ * 
+ */
 public class Snappy
 {
 
@@ -19,11 +25,13 @@ public class Snappy
     }
 
     /**
+     * Compress the content of the given input, then output the compressed data.
+     * 
      * @param uncompressed
      *            input is at buffer[pos() ... limit())
      * @param compressed
      *            output compressed data to buffer[pos()..]
-     * @return byte size of the compressed data
+     * @return byte size of the compressed data.
      */
     public static int compress(ByteBuffer uncompressed, ByteBuffer compressed) {
 
@@ -50,9 +58,10 @@ public class Snappy
      *            input is at buffer[pos() ... limit())
      * @param uncompressed
      *            output decompressed data to buffer[pot())
-     * @return
+     * @return decompressed data size
+     * 
      */
-    public static boolean uncompress(ByteBuffer compressed, ByteBuffer decompressed) {
+    public static int uncompress(ByteBuffer compressed, ByteBuffer decompressed) throws SnappyException {
 
         if (!compressed.isDirect())
             throw new IllegalArgumentException("input is not a direct buffer");
@@ -62,12 +71,13 @@ public class Snappy
         int cPos = compressed.position();
         int cLen = compressed.remaining();
 
-        boolean ret = SnappyNative.rawDecompress(compressed, cPos, cLen, decompressed, decompressed.position());
+        //         pos  limit
+        // [ ......UUUUUU.........]
+        int decompressedSize = SnappyNative
+                .rawUncompress(compressed, cPos, cLen, decompressed, decompressed.position());
+        decompressed.limit(decompressed.position() + decompressedSize);
 
-        //        compressed.limit(compressed.capacity());
-        //        compressed.position(cPos + cLen);
-
-        return ret;
+        return decompressedSize;
     }
 
     /**
@@ -77,7 +87,7 @@ public class Snappy
      *            data [pos() ... limit())
      * @return
      */
-    public static int getUncompressedLength(ByteBuffer compressed) {
+    public static int uncompressedLength(ByteBuffer compressed) throws SnappyException {
         if (!compressed.isDirect())
             throw new IllegalArgumentException("input is not a direct buffer");
 
@@ -91,7 +101,7 @@ public class Snappy
      *            byte size of the data to compress
      * @return maxmum byte size of the compressed data
      */
-    public static int getMaxCompressedLength(int byteSize) {
+    public static int maxCompressedLength(int byteSize) {
         return SnappyNative.maxCompressedLength(byteSize);
     }
 

src/main/java/org/xerial/snappy/SnappyError.java

@@ -0,0 +1,46 @@
+/*--------------------------------------------------------------------------
+ *  Copyright 2011 Taro L. Saito
+ *
+ *  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.
+ *--------------------------------------------------------------------------*/
+//--------------------------------------
+// XerialJ
+//
+// SnappyError.java
+// Since: 2011/03/30 15:22:43
+//
+// $URL$
+// $Author$
+//--------------------------------------
+package org.xerial.snappy;
+
+/**
+ * Used when serious errors (unchecked exception) in snappy-java are observed.
+ * 
+ * @author leo
+ * 
+ */
+public class SnappyError extends Error
+{
+    /**
+     * 
+     */
+    private static final long    serialVersionUID = 1L;
+
+    public final SnappyErrorCode errorCode;
+
+    public SnappyError(SnappyErrorCode code, Error e) {
+        super(e);
+        this.errorCode = code;
+    }
+}

src/main/java/org/xerial/snappy/SnappyErrorCode.java

@@ -32,6 +32,11 @@ package org.xerial.snappy;
  */
 public enum SnappyErrorCode {
 
-    FAILED_TO_LOAD_NATIVE_LIBRARY, PARSING_ERROR, ;
+    UNKNOWN(0), FAILED_TO_LOAD_NATIVE_LIBRARY(1), PARSING_ERROR(2);
 
+    public final int id;
+
+    private SnappyErrorCode(int id) {
+        this.id = id;
+    }
 }

src/main/java/org/xerial/snappy/SnappyException.java

@@ -36,10 +36,30 @@ public class SnappyException extends Exception
 
     public final SnappyErrorCode errorCode;
 
+    public SnappyException(int code) {
+        SnappyErrorCode[] values = SnappyErrorCode.values();
+        if (code < 0 || code >= values.length) {
+            this.errorCode = SnappyErrorCode.UNKNOWN;
+        }
+        else {
+            this.errorCode = values[code];
+        }
+    }
+
     public SnappyException(SnappyErrorCode errorCode) {
         this.errorCode = errorCode;
     }
 
+    public SnappyException(SnappyErrorCode errorCode, Exception e) {
+        super(e);
+        this.errorCode = errorCode;
+    }
+
+    public SnappyException(SnappyErrorCode errorCode, String message) {
+        super(message);
+        this.errorCode = errorCode;
+    }
+
     public SnappyErrorCode getErrorCode() {
         return errorCode;
     }

src/main/java/org/xerial/snappy/SnappyNative.cpp

@@ -2,6 +2,17 @@
 #include <snappy.h>
 #include "SnappyNative.h"
 
+void throw_exception(JNIEnv *env, jclass self, int errorCode)
+{
+    jmethodID mth_throwex = 0;
+
+    if (!mth_throwex)
+        mth_throwex = env->GetMethodID(self, "throw_error", "(I)V");
+
+    env->CallVoidMethod(self, mth_throwex, (jint) errorCode);
+}
+
+
 JNIEXPORT jstring JNICALL Java_org_xerial_snappy_SnappyNative_nativeLibraryVersion
   (JNIEnv * env, jclass self)
 {
@@ -29,7 +40,7 @@ JNIEXPORT jint JNICALL Java_org_xerial_snappy_SnappyNative_rawCompress
  * Method:    uncompress
  * Signature: (Ljava/nio/ByteBuffer;Ljava/nio/ByteBuffer;)Z
  */
-JNIEXPORT jboolean JNICALL Java_org_xerial_snappy_SnappyNative_rawDecompress
+JNIEXPORT jint JNICALL Java_org_xerial_snappy_SnappyNative_rawUncompress
   (JNIEnv * env, jclass self, jobject compressed, jint cpos, jint clen, jobject decompressed, jint dpos)
 {
 	char* compressedBuffer = (char*) env->GetDirectBufferAddress(compressed) + cpos;
@@ -38,8 +49,12 @@ JNIEXPORT jboolean JNICALL Java_org_xerial_snappy_SnappyNative_rawDecompress
 	size_t decompressedLength;
 	snappy::GetUncompressedLength(compressedBuffer, (size_t) clen, &decompressedLength);
 	bool ret = snappy::RawUncompress(compressedBuffer, (size_t) clen, decompressedBuffer);
+	if(!ret) {
+		throw_exception(env, self, 2);
+		return 0;
+	}
 
-	return (jboolean) ret;
+	return (jint) decompressedLength;
 }
 
 /*
@@ -64,7 +79,11 @@ JNIEXPORT jint JNICALL Java_org_xerial_snappy_SnappyNative_getUncompressedLength
 {
 	char* compressedBuffer = (char*) env->GetDirectBufferAddress(compressed) + cpos;
 	size_t result;
-	snappy::GetUncompressedLength(compressedBuffer, (size_t) clen, &result);
+	bool ret = snappy::GetUncompressedLength(compressedBuffer, (size_t) clen, &result);
+	if(!ret) {
+		throw_exception(env, self, 2);
+		return 0;
+	}
 	return (jint) result;
 }
 

src/main/java/org/xerial/snappy/SnappyNative.h

@@ -25,10 +25,10 @@ JNIEXPORT jint JNICALL Java_org_xerial_snappy_SnappyNative_rawCompress
 
 /*
  * Class:     org_xerial_snappy_SnappyNative
- * Method:    rawDecompress
- * Signature: (Ljava/nio/ByteBuffer;IILjava/nio/ByteBuffer;I)Z
+ * Method:    rawUncompress
+ * Signature: (Ljava/nio/ByteBuffer;IILjava/nio/ByteBuffer;I)I
  */
-JNIEXPORT jboolean JNICALL Java_org_xerial_snappy_SnappyNative_rawDecompress
+JNIEXPORT jint JNICALL Java_org_xerial_snappy_SnappyNative_rawUncompress
   (JNIEnv *, jclass, jobject, jint, jint, jobject, jint);
 
 /*

src/main/java/org/xerial/snappy/SnappyNative.java

@@ -25,14 +25,18 @@ public class SnappyNative
     public native static int rawCompress(ByteBuffer input, int inputOffset, int inputLength, ByteBuffer compressed,
             int outputOffset);
 
-    public native static boolean rawDecompress(ByteBuffer compressed, int inputOffset, int inputLength,
-            ByteBuffer uncompressed, int outputOffset);
+    public native static int rawUncompress(ByteBuffer compressed, int inputOffset, int inputLength,
+            ByteBuffer uncompressed, int outputOffset) throws SnappyException;
 
     // Returns the maximal size of the compressed representation of
     // input data that is "source_bytes" bytes in length;
     public native static int maxCompressedLength(int source_bytes);
 
     // This operation takes O(1) time.
-    public native static int getUncompressedLength(ByteBuffer compressed, int offset, int len);
+    public native static int getUncompressedLength(ByteBuffer compressed, int offset, int len) throws SnappyException;
+
+    public static void throw_error(int errorCode) throws SnappyException {
+        throw new SnappyException(errorCode);
+    }
 
 }

src/test/java/org/xerial/snappy/SnappyTest.java

@@ -58,14 +58,14 @@ public class SnappyTest
         src.put(orig);
         src.flip();
         _logger.info("input size: " + src.remaining());
-        int maxCompressedLen = Snappy.getMaxCompressedLength(src.remaining());
+        int maxCompressedLen = Snappy.maxCompressedLength(src.remaining());
         _logger.info("max compressed length:" + maxCompressedLen);
 
         ByteBuffer compressed = ByteBuffer.allocateDirect(maxCompressedLen);
         int compressedSize = Snappy.compress(src, compressed);
         _logger.info("compressed length: " + compressedSize);
 
-        int uncompressedLen = Snappy.getUncompressedLength(compressed);
+        int uncompressedLen = Snappy.uncompressedLength(compressed);
         _logger.info("uncompressed length: " + uncompressedLen);
         ByteBuffer extract = ByteBuffer.allocateDirect(uncompressedLen);
         Snappy.uncompress(compressed, extract);