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2026-07-22 17:42:32 -03:00
commit 3d36f2421e
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+/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
+/*
+Copyright (c) 2011 ymnk, JCraft,Inc. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+  1. Redistributions of source code must retain the above copyright notice,
+     this list of conditions and the following disclaimer.
+
+  2. Redistributions in binary form must reproduce the above copyright 
+     notice, this list of conditions and the following disclaimer in 
+     the documentation and/or other materials provided with the distribution.
+
+  3. The names of the authors may not be used to endorse or promote products
+     derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
+INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
+INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package com.jcraft.jzlib;
+import java.io.*;
+
+public class DeflaterOutputStream extends FilterOutputStream {
+
+  protected final Deflater deflater;
+
+  protected byte[] buffer;
+
+  private boolean closed = false;
+
+  private boolean syncFlush = false;
+
+  private final byte[] buf1 = new byte[1];
+
+  protected boolean mydeflater = false;
+
+  private boolean close_out = true;
+
+  protected static final int DEFAULT_BUFSIZE = 512;
+
+  public DeflaterOutputStream(OutputStream out) throws IOException {
+    this(out, 
+         new Deflater(JZlib.Z_DEFAULT_COMPRESSION),
+         DEFAULT_BUFSIZE, true);
+    mydeflater = true;
+  }
+
+  public DeflaterOutputStream(OutputStream out, Deflater def) throws IOException {
+    this(out, def, DEFAULT_BUFSIZE, true);
+  }
+
+  public DeflaterOutputStream(OutputStream out,
+                              Deflater deflater,
+                              int size) throws IOException {
+    this(out, deflater, size, true);
+  }
+  public DeflaterOutputStream(OutputStream out,
+                              Deflater deflater,
+                              int size,
+                              boolean close_out)  throws IOException {
+    super(out);
+    if (out == null || deflater == null) {
+      throw new NullPointerException();
+    }
+    else if (size <= 0) {
+      throw new IllegalArgumentException("buffer size must be greater than 0");
+    }
+    this.deflater = deflater;
+    buffer = new byte[size];
+    this.close_out = close_out;
+  }
+
+  public void write(int b) throws IOException {
+    buf1[0] = (byte)(b & 0xff);
+    write(buf1, 0, 1);
+  }
+
+  public void write(byte[] b, int off, int len) throws IOException {
+    if (deflater.finished()) {
+      throw new IOException("finished");
+    }
+    else if (off<0 | len<0 | off+len>b.length) {
+      throw new IndexOutOfBoundsException();
+    }
+    else if (len == 0) {
+      return;
+    }
+    else {
+      int flush = syncFlush ? JZlib.Z_SYNC_FLUSH : JZlib.Z_NO_FLUSH;
+      deflater.setInput(b, off, len, true);
+      while (deflater.avail_in>0) {
+        int err = deflate(flush);
+        if (err == JZlib.Z_STREAM_END)
+          break;
+      }
+    }
+  }
+
+  public void finish() throws IOException {
+    while (!deflater.finished()) {
+      deflate(JZlib.Z_FINISH);
+    }
+  }
+
+  public void close() throws IOException {
+    if (!closed) {
+      finish();
+      if (mydeflater){
+        deflater.end();
+      }
+      if(close_out)
+        out.close();
+      closed = true;
+    }
+  }
+
+  protected int deflate(int flush) throws IOException {
+    deflater.setOutput(buffer, 0, buffer.length);
+    int err = deflater.deflate(flush);
+    switch(err) {
+      case JZlib.Z_OK:
+      case JZlib.Z_STREAM_END:
+        break;
+      case JZlib.Z_BUF_ERROR:
+        if(deflater.avail_in<=0 && flush!=JZlib.Z_FINISH){
+          // flush() without any data
+          break;
+        }
+      default:
+        throw new IOException("failed to deflate: error="+err+" avail_out="+deflater.avail_out);
+    }
+    int len = deflater.next_out_index;
+    if (len > 0) {
+      out.write(buffer, 0, len);
+    }
+    return err;
+  }
+
+  public void flush() throws IOException {
+    if (syncFlush && !deflater.finished()) {
+      while (true) {
+        int err = deflate(JZlib.Z_SYNC_FLUSH);
+        if (deflater.next_out_index < buffer.length)
+          break;
+        if (err == JZlib.Z_STREAM_END)
+          break;
+      }
+    }
+    out.flush();
+  }
+
+  public long getTotalIn() {
+    return deflater.getTotalIn();
+  }
+
+  public long getTotalOut() {
+    return deflater.getTotalOut();
+  }
+
+  public void setSyncFlush(boolean syncFlush){
+    this.syncFlush = syncFlush;
+  }
+
+  public boolean getSyncFlush(){
+    return this.syncFlush;
+  }
+
+  public Deflater getDeflater(){
+    return deflater;
+  }
+}