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-rw-r--r--lib/src/main/java/com/trilead/ssh2/compression/Zlib.java61
-rw-r--r--lib/src/main/java/com/trilead/ssh2/transport/TransportConnection.java3
2 files changed, 35 insertions, 29 deletions
diff --git a/lib/src/main/java/com/trilead/ssh2/compression/Zlib.java b/lib/src/main/java/com/trilead/ssh2/compression/Zlib.java
index c81a719..8bd52d4 100644
--- a/lib/src/main/java/com/trilead/ssh2/compression/Zlib.java
+++ b/lib/src/main/java/com/trilead/ssh2/compression/Zlib.java
@@ -25,14 +25,14 @@ import com.jcraft.jzlib.ZStream;
*
*/
public class Zlib implements ICompressor {
- static private final int BUF_SIZE = 4096;
+ static private final int DEFAULT_BUF_SIZE = 4096;
static private final int LEVEL = 5;
private ZStream deflate;
- private byte[] deflate_tmpbuf = new byte[BUF_SIZE];
+ private byte[] deflate_tmpbuf;
private ZStream inflate;
- private byte[] inflate_tmpbuf = new byte[BUF_SIZE];
+ private byte[] inflate_tmpbuf;
private byte[] inflated_buf;
public Zlib() {
@@ -41,11 +41,14 @@ public class Zlib implements ICompressor {
deflate.deflateInit(LEVEL);
inflate.inflateInit();
- inflated_buf = new byte[BUF_SIZE];
+
+ deflate_tmpbuf = new byte[DEFAULT_BUF_SIZE];
+ inflate_tmpbuf = new byte[DEFAULT_BUF_SIZE];
+ inflated_buf = new byte[DEFAULT_BUF_SIZE];
}
-
+
public int getBufferSize() {
- return BUF_SIZE;
+ return DEFAULT_BUF_SIZE;
}
public int compress(byte[] buf, int start, int len, byte[] output) {
@@ -53,24 +56,26 @@ public class Zlib implements ICompressor {
deflate.next_in_index = start;
deflate.avail_in = len - start;
- int status;
- int outputlen = start;
+ if ((buf.length + 1024) > deflate_tmpbuf.length) {
+ deflate_tmpbuf = new byte[buf.length + 1024];
+ }
+
+ deflate.next_out = deflate_tmpbuf;
+ deflate.next_out_index = 0;
+ deflate.avail_out = output.length;
+
+ if (deflate.deflate(JZlib.Z_PARTIAL_FLUSH) != JZlib.Z_OK) {
+ System.err.println("compress: compression failure");
+ }
+
+ if (deflate.avail_in > 0) {
+ System.err.println("compress: deflated data too large");
+ }
+
+ int outputlen = output.length - deflate.avail_out;
+
+ System.arraycopy(deflate_tmpbuf, 0, output, 0, outputlen);
- do {
- deflate.next_out = deflate_tmpbuf;
- deflate.next_out_index = 0;
- deflate.avail_out = BUF_SIZE;
- status = deflate.deflate(JZlib.Z_PARTIAL_FLUSH);
- switch (status) {
- case JZlib.Z_OK:
- System.arraycopy(deflate_tmpbuf, 0, output, outputlen, BUF_SIZE
- - deflate.avail_out);
- outputlen += (BUF_SIZE - deflate.avail_out);
- break;
- default:
- System.err.println("compress: deflate returnd " + status);
- }
- } while (deflate.avail_out == 0);
return outputlen;
}
@@ -84,20 +89,20 @@ public class Zlib implements ICompressor {
while (true) {
inflate.next_out = inflate_tmpbuf;
inflate.next_out_index = 0;
- inflate.avail_out = BUF_SIZE;
+ inflate.avail_out = DEFAULT_BUF_SIZE;
int status = inflate.inflate(JZlib.Z_PARTIAL_FLUSH);
switch (status) {
case JZlib.Z_OK:
- if (inflated_buf.length < inflated_end + BUF_SIZE
+ if (inflated_buf.length < inflated_end + DEFAULT_BUF_SIZE
- inflate.avail_out) {
- byte[] foo = new byte[inflated_end + BUF_SIZE
+ byte[] foo = new byte[inflated_end + DEFAULT_BUF_SIZE
- inflate.avail_out];
System.arraycopy(inflated_buf, 0, foo, 0, inflated_end);
inflated_buf = foo;
}
System.arraycopy(inflate_tmpbuf, 0, inflated_buf, inflated_end,
- BUF_SIZE - inflate.avail_out);
- inflated_end += (BUF_SIZE - inflate.avail_out);
+ DEFAULT_BUF_SIZE - inflate.avail_out);
+ inflated_end += (DEFAULT_BUF_SIZE - inflate.avail_out);
length[0] = inflated_end;
break;
case JZlib.Z_BUF_ERROR:
diff --git a/lib/src/main/java/com/trilead/ssh2/transport/TransportConnection.java b/lib/src/main/java/com/trilead/ssh2/transport/TransportConnection.java
index 2384773..77eaded 100644
--- a/lib/src/main/java/com/trilead/ssh2/transport/TransportConnection.java
+++ b/lib/src/main/java/com/trilead/ssh2/transport/TransportConnection.java
@@ -152,8 +152,9 @@ public class TransportConnection
else if (padd > 64)
padd = 64;
- // TODO add compression somewhere here
if (send_comp != null && can_compress) {
+ if (send_comp_buffer.length < message.length + 1024)
+ send_comp_buffer = new byte[message.length + 1024];
len = send_comp.compress(message, off, len, send_comp_buffer);
message = send_comp_buffer;
}