Add LZMADecDemo demo program.

1 files changed, 80 insertions, 0 deletions

diff --git a/src/LZMADecDemo.java b/src/LZMADecDemo.java
new file mode 100644
index 0000000..1098725
--- /dev/null
+++ b/src/LZMADecDemo.java
@@ -0,0 +1,80 @@
+/*
+ * LZMADecDemo
+ *
+ * Author: Lasse Collin <lasse.collin@tukaani.org>
+ *
+ * This file has been put into the public domain.
+ * You can do whatever you want with this file.
+ */
+
+import java.io.*;
+import org.tukaani.xz.*;
+
+/**
+ * Decompresses .lzma files to standard output. If no arguments are given,
+ * reads from standard input.
+ *
+ * NOTE: For most purposes, .lzma is a legacy format and usually you should
+ * use .xz instead.
+ */
+class LZMADecDemo {
+    public static void main(String[] args) {
+        byte[] buf = new byte[8192];
+        String name = null;
+
+        try {
+            if (args.length == 0) {
+                name = "standard input";
+
+                // No need to use BufferedInputStream with System.in which
+                // seems to be fast with one-byte reads.
+                InputStream in = new LZMAInputStream(System.in);
+
+                int size;
+                while ((size = in.read(buf)) != -1)
+                    System.out.write(buf, 0, size);
+
+            } else {
+                // Read from files given on the command line.
+                for (int i = 0; i < args.length; ++i) {
+                    name = args[i];
+                    InputStream in = new FileInputStream(name);
+
+                    try {
+                        // In contrast to other classes in org.tukaani.xz,
+                        // LZMAInputStream doesn't do buffering internally
+                        // and reads one byte at a time. BufferedInputStream
+                        // gives a huge performance improvement here but even
+                        // then it's slower than the other input streams from
+                        // org.tukaani.xz.
+                        in = new BufferedInputStream(in);
+                        in = new LZMAInputStream(in);
+
+                        int size;
+                        while ((size = in.read(buf)) != -1)
+                            System.out.write(buf, 0, size);
+
+                    } finally {
+                        // Close FileInputStream (directly or indirectly
+                        // via LZMAInputStream, it doesn't matter).
+                        in.close();
+                    }
+                }
+            }
+        } catch (FileNotFoundException e) {
+            System.err.println("LZMADecDemo: Cannot open " + name + ": "
+                               + e.getMessage());
+            System.exit(1);
+
+        } catch (EOFException e) {
+            System.err.println("LZMADecDemo: Unexpected end of input on "
+                               + name);
+            System.exit(1);
+
+        } catch (IOException e) {
+            System.err.println("LZMADecDemo: Error decompressing from "
+                               + name + ": " + e.getMessage());
+            System.exit(1);
+        }
+    }
+}