X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Forg%2Fibex%2Futil%2FEncode.java;h=26522d78e935f9d3d935ba6f5f29cd780fc2531d;hb=a838b50960feb8b99a7e6d662c1e4b0ab8315f4b;hp=9334d46abac27dd464d0c30432b248353f7cc835;hpb=fc73b258af00744953b5098c1edb30f871039ef1;p=org.ibex.util.git

diff --git a/src/org/ibex/util/Encode.java b/src/org/ibex/util/Encode.java
index 9334d46..26522d7 100644
--- a/src/org/ibex/util/Encode.java
+++ b/src/org/ibex/util/Encode.java
@@ -1,9 +1,278 @@
+// Copyright 2000-2005 the Contributors, as shown in the revision logs.
+// Licensed under the Apache Public Source License 2.0 ("the License").
+// You may not use this file except in compliance with the License.
+
 package org.ibex.util;
+
 import java.io.*;
-import java.util.*;
-import java.util.zip.*;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.GZIPOutputStream;
+
+/** General <tt>String</tt> and <tt>byte[]</tt> processing functions,
+ *  including Base64 and a safe filename transform.
+ *
+ *  @author adam@ibex.org
+ */
+public final class Encode {
+
+    public static long twoFloatsToLong(float a, float b) {
+        return ((Float.floatToIntBits(a) & 0xffffffffL) << 32) | (Float.floatToIntBits(b) & 0xffffffffL); }
+    public static float longToFloat1(long l) { return Float.intBitsToFloat((int)(l >> 32)); }
+    public static float longToFloat2(long l) { return Float.intBitsToFloat((int)(l & 0xffffffff)); }
+
+    private static final char[] fn =
+        new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
+
+    public static String toFilename(String s) {
+        StringBuffer sb = new StringBuffer();
+        try {
+            byte[] b = s.getBytes("UTF-8");
+            for(int i=0; i<b.length; i++) {
+                char c = (char)(b[i] & 0xff);
+                if (c == File.separatorChar || c < 32 || c > 126 || c == '%' || (i == 0 && c == '.'))
+                    sb.append("%" + fn[(b[i] & 0xf0) >> 8] + fn[b[i] & 0xf]);
+                else sb.append(c);
+            }
+            return sb.toString();
+        } catch (UnsupportedEncodingException uee) {
+            throw new Error("this should never happen; Java spec mandates UTF-8 support");
+        }
+    }
+
+    public static String fromFilename(String s) {
+        StringBuffer sb = new StringBuffer();
+        byte[] b = new byte[s.length() * 2];
+        int bytes = 0;
+        for(int i=0; i<s.length(); i++) {
+            char c = s.charAt(i);
+            if (c == '%') b[bytes++] = (byte)Integer.parseInt(("" + s.charAt(++i) + s.charAt(++i)), 16);
+            else b[bytes++] = (byte)c;
+        }
+        try {
+            return new String(b, 0, bytes, "UTF-8");
+        } catch (UnsupportedEncodingException uee) {
+            throw new Error("this should never happen; Java spec mandates UTF-8 support");
+        }
+    }
+
+
+    private static final byte[] encB64 = {
+        (byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',
+        (byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',
+        (byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',
+        (byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',
+        (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',
+        (byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',
+        (byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',
+        (byte)'v', (byte)'w', (byte)'x', (byte)'y', (byte)'z', (byte)'0', (byte)'1',
+        (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6', (byte)'7', (byte)'8',
+        (byte)'9', (byte)'+', (byte)'/'
+    };
+
+    // FIXME could be far more efficient
+    public static class Base64InputStream extends ByteArrayInputStream {
+        public Base64InputStream(String s) { super(fromBase64(s.getBytes())); }
+    }
+
+    public static byte[] toBase64(String data) { return toBase64(data.getBytes()); }
+
+    /** Encode the input data producong a base 64 encoded byte array.
+     *  @return A byte array containing the base 64 encoded data. */
+    public static byte[] toBase64(byte[] data) {
+        byte[]  bytes;
+                
+        int modulus = data.length % 3;
+        if (modulus == 0) {
+            bytes = new byte[4 * data.length / 3];
+        } else {
+            bytes = new byte[4 * ((data.length / 3) + 1)];
+        }
+
+        int dataLength = (data.length - modulus);
+        int a1, a2, a3;
+        for (int i = 0, j = 0; i < dataLength; i += 3, j += 4) {
+            a1 = data[i] & 0xff;
+            a2 = data[i + 1] & 0xff;
+            a3 = data[i + 2] & 0xff;
+            
+            bytes[j] = encB64[(a1 >>> 2) & 0x3f];
+            bytes[j + 1] = encB64[((a1 << 4) | (a2 >>> 4)) & 0x3f];
+            bytes[j + 2] = encB64[((a2 << 2) | (a3 >>> 6)) & 0x3f];
+            bytes[j + 3] = encB64[a3 & 0x3f];
+        }
+
+        int b1, b2, b3;
+        int d1, d2;
+        switch (modulus) {
+                case 0:         /* nothing left to do */
+                    break;
+                case 1:
+                    d1 = data[data.length - 1] & 0xff;
+                    b1 = (d1 >>> 2) & 0x3f;
+                    b2 = (d1 << 4) & 0x3f;
+
+                    bytes[bytes.length - 4] = encB64[b1];
+                    bytes[bytes.length - 3] = encB64[b2];
+                    bytes[bytes.length - 2] = (byte)'=';
+                    bytes[bytes.length - 1] = (byte)'=';
+                    break;
+                case 2:
+                    d1 = data[data.length - 2] & 0xff;
+                    d2 = data[data.length - 1] & 0xff;
+
+                    b1 = (d1 >>> 2) & 0x3f;
+                    b2 = ((d1 << 4) | (d2 >>> 4)) & 0x3f;
+                    b3 = (d2 << 2) & 0x3f;
+
+                    bytes[bytes.length - 4] = encB64[b1];
+                    bytes[bytes.length - 3] = encB64[b2];
+                    bytes[bytes.length - 2] = encB64[b3];
+                    bytes[bytes.length - 1] = (byte)'=';
+                    break;
+            }
+
+        return bytes;
+    }
 
-public class Encode {
+
+    private static final byte[] decB64 = new byte[128];
+    static {
+        for (int i = 'A'; i <= 'Z'; i++) decB64[i] = (byte)(i - 'A');
+        for (int i = 'a'; i <= 'z'; i++) decB64[i] = (byte)(i - 'a' + 26);
+        for (int i = '0'; i <= '9'; i++) decB64[i] = (byte)(i - '0' + 52);
+        decB64['+'] = 62;
+        decB64['/'] = 63;
+    }
+
+    /** Decode base 64 encoded input data.
+     *  @return A byte array representing the decoded data. */
+    public static byte[] fromBase64(byte[] data) {
+        byte[]  bytes;
+        byte    b1, b2, b3, b4;
+
+        if (data[data.length - 2] == '=') bytes = new byte[(((data.length / 4) - 1) * 3) + 1];
+        else if (data[data.length - 1] == '=') bytes = new byte[(((data.length / 4) - 1) * 3) + 2];
+        else bytes = new byte[((data.length / 4) * 3)];
+
+        for (int i = 0, j = 0; i < data.length - 4; i += 4, j += 3) {
+            b1 = decB64[data[i]];
+            b2 = decB64[data[i + 1]];
+            b3 = decB64[data[i + 2]];
+            b4 = decB64[data[i + 3]];
+            
+            bytes[j] = (byte)((b1 << 2) | (b2 >> 4));
+            bytes[j + 1] = (byte)((b2 << 4) | (b3 >> 2));
+            bytes[j + 2] = (byte)((b3 << 6) | b4);
+        }
+
+        if (data[data.length - 2] == '=') {
+            b1 = decB64[data[data.length - 4]];
+            b2 = decB64[data[data.length - 3]];
+            bytes[bytes.length - 1] = (byte)((b1 << 2) | (b2 >> 4));
+        } else if (data[data.length - 1] == '=') {
+            b1 = decB64[data[data.length - 4]];
+            b2 = decB64[data[data.length - 3]];
+            b3 = decB64[data[data.length - 2]];
+            bytes[bytes.length - 2] = (byte)((b1 << 2) | (b2 >> 4));
+            bytes[bytes.length - 1] = (byte)((b2 << 4) | (b3 >> 2));
+        } else {
+            b1 = decB64[data[data.length - 4]];
+            b2 = decB64[data[data.length - 3]];
+            b3 = decB64[data[data.length - 2]];
+            b4 = decB64[data[data.length - 1]];
+            bytes[bytes.length - 3] = (byte)((b1 << 2) | (b2 >> 4));
+            bytes[bytes.length - 2] = (byte)((b2 << 4) | (b3 >> 2));
+            bytes[bytes.length - 1] = (byte)((b3 << 6) | b4);
+        }
+        return bytes;
+    }
+
+    /** Decode a base 64 encoded String.
+     *  @return A byte array representing the decoded data. */
+    public static byte[] fromBase64(String data) {
+        byte[]  bytes;
+        byte    b1, b2, b3, b4;
+
+        if (data.charAt(data.length() - 2) == '=')
+            bytes = new byte[(((data.length() / 4) - 1) * 3) + 1];
+        else if (data.charAt(data.length() - 1) == '=')
+            bytes = new byte[(((data.length() / 4) - 1) * 3) + 2];
+        else
+            bytes = new byte[((data.length() / 4) * 3)];
+
+        for (int i = 0, j = 0; i < data.length() - 4; i += 4, j += 3) {
+            b1 = decB64[data.charAt(i)];
+            b2 = decB64[data.charAt(i + 1)];
+            b3 = decB64[data.charAt(i + 2)];
+            b4 = decB64[data.charAt(i + 3)];
+            
+            bytes[j] = (byte)((b1 << 2) | (b2 >> 4));
+            bytes[j + 1] = (byte)((b2 << 4) | (b3 >> 2));
+            bytes[j + 2] = (byte)((b3 << 6) | b4);
+        }
+
+        if (data.charAt(data.length() - 2) == '=') {
+            b1 = decB64[data.charAt(data.length() - 4)];
+            b2 = decB64[data.charAt(data.length() - 3)];
+            bytes[bytes.length - 1] = (byte)((b1 << 2) | (b2 >> 4));
+        } else if (data.charAt(data.length() - 1) == '=') {
+            b1 = decB64[data.charAt(data.length() - 4)];
+            b2 = decB64[data.charAt(data.length() - 3)];
+            b3 = decB64[data.charAt(data.length() - 2)];
+            bytes[bytes.length - 2] = (byte)((b1 << 2) | (b2 >> 4));
+            bytes[bytes.length - 1] = (byte)((b2 << 4) | (b3 >> 2));
+        } else {
+            b1 = decB64[data.charAt(data.length() - 4)];
+            b2 = decB64[data.charAt(data.length() - 3)];
+            b3 = decB64[data.charAt(data.length() - 2)];
+            b4 = decB64[data.charAt(data.length() - 1)];
+            bytes[bytes.length - 3] = (byte)((b1 << 2) | (b2 >> 4));
+            bytes[bytes.length - 2] = (byte)((b2 << 4) | (b3 >> 2));
+            bytes[bytes.length - 1] = (byte)((b3 << 6) | b4);
+        }
+        return bytes;
+    }
+
+
+    /** Packs 8-bit bytes into a String of 7-bit chars.
+     *  @throws IllegalArgumentException when <tt>len</tt> is not a multiple of 7.
+     *  @return A String representing the processed bytes. */
+    public static String toStringFrom8bit(byte[] b, int off, int len) throws IllegalArgumentException {
+        if (len % 7 != 0) throw new IllegalArgumentException("len must be a multiple of 7");
+        StringBuffer ret = new StringBuffer();
+        for(int i=off; i<off+len; i += 7) {
+            long l = 0;
+            for(int j=6; j>=0; j--) {
+                l <<= 8;
+                l |= (b[i + j] & 0xff);
+            }
+            for(int j=0; j<8; j++) {
+                ret.append((char)(l & 0x7f));
+                l >>= 7;
+            }
+        }
+        return ret.toString();
+    }
+
+    /** Packs a String of 7-bit chars into 8-bit bytes.
+     *  @throws IllegalArgumentException when <tt>s.length()</tt> is not a multiple of 8.
+     *  @return A byte array representing the processed String. */
+    public static byte[] fromStringTo8bit(String s) throws IllegalArgumentException {
+        if (s.length() % 8 != 0) throw new IllegalArgumentException("string length must be a multiple of 8");
+        byte[] ret = new byte[(s.length() / 8) * 7];
+        for(int i=0; i<s.length(); i += 8) {
+            long l = 0;
+            for(int j=7; j>=0; j--) {
+                l <<= 7;
+                l |= (s.charAt(i + j) & 0x7fL);
+            }
+            for(int j=0; j<7; j++) {
+                ret[(i / 8) * 7 + j] = (byte)(l & 0xff);
+                l >>= 8;
+            }
+        }
+        return ret;
+    }
 
     public static class JavaSourceCode {