Initial revision

From-SVN: r102074

libjava/classpath/gnu/java/net/protocol/http/ChunkedInputStream.java

@@ -0,0 +1,172 @@
+/* ChunkedInputStream.java --
+   Copyright (C) 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+ 
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.net.protocol.http;
+
+import java.io.FilterInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.ProtocolException;
+
+/**
+ * Input stream wrapper for the "chunked" transfer-coding.
+ *
+ * @author Chris Burdess (dog@gnu.org)
+ */
+public class ChunkedInputStream
+  extends FilterInputStream
+{
+
+  private static final byte CR = 0x0d;
+  private static final byte LF = 0x0a;
+
+  int size;
+  int count;
+  boolean meta;
+  boolean eof;
+  Headers headers;
+
+  /**
+   * Constructor.
+   * @param in the response socket input stream
+   * @param headers the headers to receive additional header lines
+   */
+  public ChunkedInputStream(InputStream in, Headers headers)
+  {
+    super(in);
+    this.headers = headers;
+    size = -1;
+    count = 0;
+    meta = true;
+  }
+
+  public int read()
+    throws IOException
+  {
+    byte[] buf = new byte[1];
+    int len = read(buf, 0, 1);
+    if (len == -1)
+      {
+        return -1;
+      }
+    int ret = (int) buf[0];
+    if (ret < 0)
+      {
+        ret += 0x100;
+      }
+    return ret;
+  }
+
+  public int read(byte[] buffer)
+    throws IOException
+  {
+    return read(buffer, 0, buffer.length);
+  }
+
+  public int read(byte[] buffer, int offset, int length)
+    throws IOException
+  {
+    if (eof)
+      {
+        return -1;
+      }
+    if (meta)
+      {
+        // Read chunk header
+        int c, last = 0;
+        boolean seenSemi = false;
+        StringBuffer buf = new StringBuffer();
+        do
+          {
+            c = in.read();
+            if (c == 0x3b) // ;
+              {
+                seenSemi = true;
+              }
+            else if (c == 0x0a && last == 0x0d) // CRLF
+              {
+                size = Integer.parseInt(buf.toString(), 16);
+                break;
+              }
+            else if (!seenSemi && c >= 0x30)
+              {
+                buf.append ((char) c);
+              }
+            last = c;
+          }
+        while(c != -1);
+        count = 0;
+        meta = false;
+      }
+    if (size == 0)
+      {
+        // Read trailer
+        headers.parse(in);
+        eof = true;
+        return -1;
+      }
+    else
+      {
+        int diff = length - offset;
+        int max = size - count;
+        max = (diff < max) ? diff : max;
+        int len = (max > 0) ? in.read(buffer, offset, max) : 0;
+        count += len;
+        if (count == size)
+          {
+            // Read CRLF
+            int c1 = in.read();
+            int c2 = in.read();
+            if (c1 == -1 && c2 == -1)
+              {
+                // EOF before CRLF: bad, but ignore
+                eof = true;
+                return -1;
+              }
+            if (c1 != 0x0d || c2 != 0x0a)
+              {
+                throw new ProtocolException("expecting CRLF: " + c1 + "," + c2);
+              }
+            meta = true;
+          }
+        return len;
+      }
+  }
+  
+}
+