a new java implementation of base64 for android-common
A new Base64 encoder/decoder class. Some benchmarks comparing the
decoder it to those from android.os.Base64Utils (a decode-only native
implementation not accessible to apps) and
org.apache.commons.codec.binary.Base64, all with the JIT enabled:
1k encoded data
APACHE avg: 811 us min: 244 us max: 13671 us
COMMON avg: 263 us min: 30 us max: 4730 us
NATIVE avg: 102 us min: 61 us max: 5493 us
10k encoded data
APACHE avg: 3624 us min: 2746 us max: 23895 us
COMMON avg: 979 us min: 518 us max: 7751 us
NATIVE avg: 817 us min: 762 us max: 3143 us
100k encoded data
APACHE avg: 33167 us min: 31829 us max: 140411 us
COMMON avg: 6047 us min: 5493 us max: 45227 us
NATIVE avg: 10109 us min: 10009 us max: 12451 us
Change-Id: Ic622e3a967a62d57d30bd25b80cbe4e0dd60e764
diff --git a/common/java/com/android/common/Base64.java b/common/java/com/android/common/Base64.java
new file mode 100644
index 0000000..d108f44
--- /dev/null
+++ b/common/java/com/android/common/Base64.java
@@ -0,0 +1,497 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.common;
+
+/**
+ * Utilities for encoding and decoding the Base64 encoding. See RFCs
+ * 2045 and 3548.
+ */
+public class Base64 {
+ /**
+ * Encoder flag bit to indicate you want the padding '='
+ * characters at the end (if any) to be omitted.
+ */
+ public static final int NO_PADDING = 1;
+
+ /**
+ * Encoder flag bit to indicate you want all line terminators to
+ * be omitted (ie, the output will be on one long line).
+ */
+ public static final int NO_WRAP = 2;
+
+ /**
+ * Encoder flag bit to indicate you want lines to be ended with
+ * CRLF instead of just LF.
+ */
+ public static final int CRLF = 4;
+
+ /**
+ * Encoder/decoder flag bit to indicate using the "web safe"
+ * variant of Base64 (see RFC 3548 section 4) where '-' and '_'
+ * are used in place of '+' and '/'.
+ */
+ public static final int WEB_SAFE = 8;
+
+ /**
+ * Lookup table for turning bytes into their position in the
+ * Base64 alphabet.
+ */
+ private static final int DECODE[] = {
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -2, -1, -1,
+ -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
+ 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
+ -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+ 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ };
+
+ /**
+ * Decode lookup table for the "web safe" variant (RFC 3548
+ * sec. 4) where - and _ replace + and /.
+ */
+ private static final int DECODE_WEBSAFE[] = {
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1,
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -2, -1, -1,
+ -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
+ 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, 63,
+ -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+ 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ };
+
+ /** Non-data values in the DECODE arrays. */
+ private static final int SKIP = -1;
+ private static final int EQUALS = -2;
+
+ /**
+ * Decode the Base64-encoded data in input and return the data in
+ * a new byte array.
+ *
+ * The padding '=' characters at the end are considered optional, but
+ * if any are present, there must be the correct number of them.
+ *
+ * @param input the input String to decode, which is converted to
+ * bytes using the default charset
+ * @param flags controls certain features of the decoded output.
+ * Passing 0 to decode standard Base64.
+ *
+ * @throws IllegalArgumentException if the input contains
+ * incorrect padding
+ */
+ public static byte[] decode(String str, int flags) {
+ return decode(str.getBytes(), flags);
+ }
+
+ /**
+ * Decode the Base64-encoded data in input and return the data in
+ * a new byte array.
+ *
+ * The padding '=' characters at the end are considered optional, but
+ * if any are present, there must be the correct number of them.
+ *
+ * @param input the input array to decode
+ * @param flags controls certain features of the decoded output.
+ * Passing 0 to decode standard Base64.
+ *
+ * @throws IllegalArgumentException if the input contains
+ * incorrect padding
+ */
+ public static byte[] decode(byte[] input, int flags) {
+ return decode(input, 0, input.length, flags);
+ }
+
+ /**
+ * Decode the Base64-encoded data in input and return the data in
+ * a new byte array.
+ *
+ * The padding '=' characters at the end are considered optional, but
+ * if any are present, there must be the correct number of them.
+ *
+ * @param input the data to decode
+ * @param offset the position within the input array at which to start
+ * @param len the number of bytes of input to decode
+ * @param flags controls certain features of the decoded output.
+ * Passing 0 to decode standard Base64.
+ *
+ * @throws IllegalArgumentException if the input contains
+ * incorrect padding
+ */
+ public static byte[] decode(byte[] input, int offset, int len, int flags) {
+ int p = offset;
+ // Allocate space for the most data the input could represent.
+ // (It could contain less if it contains whitespace, etc.)
+ byte[] output = new byte[len*3/4];
+ len += offset;
+ int op = 0;
+
+ final int[] decode = ((flags & WEB_SAFE) == 0) ?
+ DECODE : DECODE_WEBSAFE;
+
+ int state = 0;
+ int value = 0;
+
+ while (p < len) {
+
+ // Try the fast path: we're starting a new tuple and the
+ // next four bytes of the input stream are all data
+ // bytes. This corresponds to going through states
+ // 0-1-2-3-0. We expect to use this method for most of
+ // the data.
+ //
+ // If any of the next four bytes of input are non-data
+ // (whitespace, etc.), value will end up negative. (All
+ // the non-data values in decode are small negative
+ // numbers, so shifting any of them up and or'ing them
+ // together will result in a value with its top bit set.)
+ //
+ // You can remove this whole block and the output should
+ // be the same, just slower.
+ if (state == 0 && p+4 <= len &&
+ (value = ((decode[input[p] & 0xff] << 18) |
+ (decode[input[p+1] & 0xff] << 12) |
+ (decode[input[p+2] & 0xff] << 6) |
+ (decode[input[p+3] & 0xff]))) >= 0) {
+ output[op+2] = (byte) value;
+ output[op+1] = (byte) (value >> 8);
+ output[op] = (byte) (value >> 16);
+ op += 3;
+ p += 4;
+ continue;
+ }
+
+ // The fast path isn't available -- either we've read a
+ // partial tuple, or the next four input bytes aren't all
+ // data, or whatever. Fall back to the slower state
+ // machine implementation.
+ //
+ // States 0-3 are reading through the next input tuple.
+ // State 4 is having read one '=' and expecting exactly
+ // one more.
+ // State 5 is expecting no more data or padding characters
+ // in the input.
+
+ int d = decode[input[p++] & 0xff];
+
+ switch (state) {
+ case 0:
+ if (d >= 0) {
+ value = d;
+ ++state;
+ } else if (d != SKIP) {
+ throw new IllegalArgumentException("bad base-64");
+ }
+ break;
+
+ case 1:
+ if (d >= 0) {
+ value = (value << 6) | d;
+ ++state;
+ } else if (d != SKIP) {
+ throw new IllegalArgumentException("bad base-64");
+ }
+ break;
+
+ case 2:
+ if (d >= 0) {
+ value = (value << 6) | d;
+ ++state;
+ } else if (d == EQUALS) {
+ // Emit the last (partial) output tuple;
+ // expect exactly one more padding character.
+ output[op++] = (byte) (value >> 4);
+ state = 4;
+ } else if (d != SKIP) {
+ throw new IllegalArgumentException("bad base-64");
+ }
+ break;
+
+ case 3:
+ if (d >= 0) {
+ // Emit the output triple and return to state 0.
+ value = (value << 6) | d;
+ output[op+2] = (byte) value;
+ output[op+1] = (byte) (value >> 8);
+ output[op] = (byte) (value >> 16);
+ op += 3;
+ state = 0;
+ } else if (d == EQUALS) {
+ // Emit the last (partial) output tuple;
+ // expect no further data or padding characters.
+ output[op+1] = (byte) (value >> 2);
+ output[op] = (byte) (value >> 10);
+ op += 2;
+ state = 5;
+ } else if (d != SKIP) {
+ throw new IllegalArgumentException("bad base-64");
+ }
+ break;
+
+ case 4:
+ if (d == EQUALS) {
+ ++state;
+ } else if (d != SKIP) {
+ throw new IllegalArgumentException("bad base-64");
+ }
+ break;
+
+ case 5:
+ if (d != SKIP) {
+ throw new IllegalArgumentException("bad base-64");
+ }
+ break;
+ }
+ }
+
+ // Done reading input. Now figure out where we are left in
+ // the state machine and finish up.
+
+ switch (state) {
+ case 0:
+ // Output length is a multiple of three. Fine.
+ break;
+ case 1:
+ // Read one extra input byte, which isn't enough to
+ // make another output byte. Illegal.
+ throw new IllegalArgumentException("bad base-64");
+ case 2:
+ // Read two extra input bytes, enough to emit 1 more
+ // output byte. Fine.
+ output[op++] = (byte) (value >> 4);
+ break;
+ case 3:
+ // Read three extra input bytes, enough to emit 2 more
+ // output bytes. Fine.
+ output[op+1] = (byte) (value >> 2);
+ output[op] = (byte) (value >> 10);
+ op += 2;
+ break;
+ case 4:
+ // Read one padding '=' when we expected 2. Illegal.
+ throw new IllegalArgumentException("bad base-64");
+ case 5:
+ // Read all the padding '='s we expected and no more.
+ // Fine.
+ break;
+ }
+
+ // Maybe we got lucky and allocated exactly enough output space.
+ if (op == output.length) {
+ return output;
+ }
+
+ // Need to shorten the array, so allocate a new one of the
+ // right size and copy.
+ byte[] temp = new byte[op];
+ System.arraycopy(output, 0, temp, 0, op);
+ return temp;
+ }
+
+ /**
+ * Emit a new line every this many output tuples. Corresponds to
+ * a 76-character line length (the maximum allowable according to
+ * RFC 2045).
+ */
+ private static final int LINE_GROUPS = 19;
+
+ /**
+ * Lookup table for turning Base64 alphabet positions (6 bits)
+ * into output bytes.
+ */
+ private static final byte ENCODE[] = {
+ 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
+ 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
+ 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
+ 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
+ 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
+ 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
+ 'w', 'x', 'y', 'z', '0', '1', '2', '3',
+ '4', '5', '6', '7', '8', '9', '+', '/',
+ };
+
+ /**
+ * Lookup table for turning Base64 alphabet positions (6 bits)
+ * into output bytes.
+ */
+ private static final byte ENCODE_WEBSAFE[] = {
+ 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
+ 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
+ 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
+ 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
+ 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
+ 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
+ 'w', 'x', 'y', 'z', '0', '1', '2', '3',
+ '4', '5', '6', '7', '8', '9', '-', '_',
+ };
+
+ /**
+ * Base64-encode the given data and return a newly allocated
+ * String with the result.
+ *
+ * @param input the data to encode
+ * @param flags controls certain features of the encoded output.
+ * Passing 0 results in output that adheres to RFC
+ * 2045.
+ */
+ public static String encodeString(byte[] input, int flags) {
+ return new String(encode(input, flags));
+ }
+
+ /**
+ * Base64-encode the given data and return a newly allocated
+ * String with the result.
+ *
+ * @param input the data to encode
+ * @param offset the position within the input array at which to
+ * start
+ * @param len the number of bytes of input to encode
+ * @param flags controls certain features of the encoded output.
+ * Passing 0 results in output that adheres to RFC
+ * 2045.
+ */
+ public static String encodeString(byte[] input, int offset, int len, int flags) {
+ return new String(encode(input, offset, len, flags));
+ }
+
+ /**
+ * Base64-encode the given data and return a newly allocated
+ * byte[] with the result.
+ *
+ * @param input the data to encode
+ * @param flags controls certain features of the encoded output.
+ * Passing 0 results in output that adheres to RFC
+ * 2045.
+ */
+ public static byte[] encode(byte[] input, int flags) {
+ return encode(input, 0, input.length, flags);
+ }
+
+ /**
+ * Base64-encode the given data and return a newly allocated
+ * byte[] with the result.
+ *
+ * @param input the data to encode
+ * @param offset the position within the input array at which to
+ * start
+ * @param len the number of bytes of input to encode
+ * @param flags controls certain features of the encoded output.
+ * Passing 0 results in output that adheres to RFC
+ * 2045.
+ */
+ public static byte[] encode(byte[] input, int offset, int len, int flags) {
+ final boolean do_padding = (flags & NO_PADDING) == 0;
+ final boolean do_newline = (flags & NO_WRAP) == 0;
+ final boolean do_cr = (flags & CRLF) != 0;
+
+ final byte[] encode = ((flags & WEB_SAFE) == 0) ? ENCODE : ENCODE_WEBSAFE;
+
+ // Compute the exact length of the array we will produce.
+ int output_len = len / 3 * 4;
+
+ // Account for the tail of the data and the padding bytes, if any.
+ if (do_padding) {
+ if (len % 3 > 0) {
+ output_len += 4;
+ }
+ } else {
+ switch (len % 3) {
+ case 0: break;
+ case 1: output_len += 2; break;
+ case 2: output_len += 3; break;
+ }
+ }
+
+ // Account for the newlines, if any.
+ if (do_newline && len > 0) {
+ output_len += (((len-1) / (3 * LINE_GROUPS)) + 1) * (do_cr ? 2 : 1);
+ }
+
+ int op = 0;
+ byte[] output = new byte[output_len];
+
+ // The main loop, turning 3 input bytes into 4 output bytes on
+ // each iteration.
+ int count = do_newline ? LINE_GROUPS : -1;
+ int p = offset;
+ len += offset;
+ while (p+3 <= len) {
+ int v = ((input[p++] & 0xff) << 16) |
+ ((input[p++] & 0xff) << 8) |
+ (input[p++] & 0xff);
+ output[op++] = encode[(v >> 18) & 0x3f];
+ output[op++] = encode[(v >> 12) & 0x3f];
+ output[op++] = encode[(v >> 6) & 0x3f];
+ output[op++] = encode[v & 0x3f];
+ if (--count == 0) {
+ if (do_cr) output[op++] = '\r';
+ output[op++] = '\n';
+ count = LINE_GROUPS;
+ }
+ }
+
+ // Finish up the tail of the input.
+ if (p == len-1) {
+ int v = (input[p] & 0xff) << 4;
+ output[op++] = encode[(v >> 6) & 0x3f];
+ output[op++] = encode[v & 0x3f];
+ if (do_padding) {
+ output[op++] = '=';
+ output[op++] = '=';
+ }
+ if (do_newline) {
+ if (do_cr) output[op++] = '\r';
+ output[op++] = '\n';
+ }
+ } else if (p == len-2) {
+ int v = ((input[p] & 0xff) << 10) | ((input[p+1] & 0xff) << 2);
+ output[op++] = encode[(v >> 12) & 0x3f];
+ output[op++] = encode[(v >> 6) & 0x3f];
+ output[op++] = encode[v & 0x3f];
+ if (do_padding) {
+ output[op++] = '=';
+ }
+ if (do_newline) {
+ if (do_cr) output[op++] = '\r';
+ output[op++] = '\n';
+ }
+ } else if (do_newline && op > 0 && count != LINE_GROUPS) {
+ if (do_cr) output[op++] = '\r';
+ output[op++] = '\n';
+ }
+
+ assert op == output.length;
+ return output;
+ }
+}
diff --git a/common/tests/src/com/android/common/Base64Test.java b/common/tests/src/com/android/common/Base64Test.java
new file mode 100644
index 0000000..39c4b20
--- /dev/null
+++ b/common/tests/src/com/android/common/Base64Test.java
@@ -0,0 +1,208 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.common;
+
+import junit.framework.TestCase;
+
+public class Base64Test extends TestCase {
+ private static final String TAG = "B64Test";
+
+ /** Decodes a string, returning a string. */
+ private String decodeString(String in) throws Exception {
+ byte[] out = Base64.decode(in, 0);
+ return new String(out);
+ }
+
+ /**
+ * Encodes the string 'in' using 'flags'. Asserts that decoding
+ * gives the same string. Returns the encoded string.
+ */
+ private String encodeString(String in, int flags) throws Exception {
+ String b64 = Base64.encodeString(in.getBytes(), flags);
+ String dec = decodeString(b64);
+ assertEquals(in, dec);
+ return b64;
+ }
+
+ /** Assert that decoding 'in' throws IllegalArgumentException. */
+ private void assertBad(String in) throws Exception {
+ try {
+ byte[] out = Base64.decode(in, 0);
+ fail("should have failed to decode");
+ } catch (IllegalArgumentException e) {
+ }
+ }
+
+ /** Assert that actual equals the first len bytes of expected. */
+ private void assertEquals(byte[] expected, int len, byte[] actual) {
+ assertEquals(len, actual.length);
+ for (int i = 0; i < len; ++i) {
+ assertEquals(expected[i], actual[i]);
+ }
+ }
+
+ public void testDecodeExtraChars() throws Exception {
+ // padding 0
+ assertEquals("hello, world", decodeString("aGVsbG8sIHdvcmxk"));
+ assertBad("aGVsbG8sIHdvcmxk=");
+ assertBad("aGVsbG8sIHdvcmxk==");
+ assertBad("aGVsbG8sIHdvcmxk =");
+ assertBad("aGVsbG8sIHdvcmxk = = ");
+ assertEquals("hello, world", decodeString(" aGVs bG8s IHdv cmxk "));
+ assertEquals("hello, world", decodeString(" aGV sbG8 sIHd vcmx k "));
+ assertEquals("hello, world", decodeString(" aG VsbG 8sIH dvcm xk "));
+ assertEquals("hello, world", decodeString(" a GVsb G8sI Hdvc mxk "));
+ assertEquals("hello, world", decodeString(" a G V s b G 8 s I H d v c m x k "));
+ assertEquals("hello, world", decodeString("_a*G_V*s_b*G_8*s_I*H_d*v_c*m_x*k_"));
+ assertEquals("hello, world", decodeString("aGVsbG8sIHdvcmxk"));
+
+ // padding 1
+ assertEquals("hello, world?!", decodeString("aGVsbG8sIHdvcmxkPyE="));
+ assertEquals("hello, world?!", decodeString("aGVsbG8sIHdvcmxkPyE"));
+ assertBad("aGVsbG8sIHdvcmxkPyE==");
+ assertBad("aGVsbG8sIHdvcmxkPyE ==");
+ assertBad("aGVsbG8sIHdvcmxkPyE = = ");
+ assertEquals("hello, world?!", decodeString("aGVsbG8sIHdvcmxkPy E="));
+ assertEquals("hello, world?!", decodeString("aGVsbG8sIHdvcmxkPy E"));
+ assertEquals("hello, world?!", decodeString("aGVsbG8sIHdvcmxkPy E ="));
+ assertEquals("hello, world?!", decodeString("aGVsbG8sIHdvcmxkPy E "));
+ assertEquals("hello, world?!", decodeString("aGVsbG8sIHdvcmxkPy E = "));
+ assertEquals("hello, world?!", decodeString("aGVsbG8sIHdvcmxkPy E "));
+
+ // padding 2
+ assertEquals("hello, world.", decodeString("aGVsbG8sIHdvcmxkLg=="));
+ assertEquals("hello, world.", decodeString("aGVsbG8sIHdvcmxkLg"));
+ assertBad("aGVsbG8sIHdvcmxkLg=");
+ assertBad("aGVsbG8sIHdvcmxkLg =");
+ assertBad("aGVsbG8sIHdvcmxkLg = ");
+ assertEquals("hello, world.", decodeString("aGVsbG8sIHdvcmxkL g=="));
+ assertEquals("hello, world.", decodeString("aGVsbG8sIHdvcmxkL g"));
+ assertEquals("hello, world.", decodeString("aGVsbG8sIHdvcmxkL g =="));
+ assertEquals("hello, world.", decodeString("aGVsbG8sIHdvcmxkL g "));
+ assertEquals("hello, world.", decodeString("aGVsbG8sIHdvcmxkL g = = "));
+ assertEquals("hello, world.", decodeString("aGVsbG8sIHdvcmxkL g "));
+ }
+
+ private static final byte[] BYTES = { (byte) 0xff, (byte) 0xee, (byte) 0xdd,
+ (byte) 0xcc, (byte) 0xbb, (byte) 0xaa,
+ (byte) 0x99, (byte) 0x88, (byte) 0x77 };
+
+ public void testBinaryDecode() throws Exception {
+ assertEquals(BYTES, 0, Base64.decode("", 0));
+ assertEquals(BYTES, 1, Base64.decode("/w==", 0));
+ assertEquals(BYTES, 2, Base64.decode("/+4=", 0));
+ assertEquals(BYTES, 3, Base64.decode("/+7d", 0));
+ assertEquals(BYTES, 4, Base64.decode("/+7dzA==", 0));
+ assertEquals(BYTES, 5, Base64.decode("/+7dzLs=", 0));
+ assertEquals(BYTES, 6, Base64.decode("/+7dzLuq", 0));
+ assertEquals(BYTES, 7, Base64.decode("/+7dzLuqmQ==", 0));
+ assertEquals(BYTES, 8, Base64.decode("/+7dzLuqmYg=", 0));
+ }
+
+ public void testWebSafe() throws Exception {
+ assertEquals(BYTES, 0, Base64.decode("", Base64.WEB_SAFE));
+ assertEquals(BYTES, 1, Base64.decode("_w==", Base64.WEB_SAFE));
+ assertEquals(BYTES, 2, Base64.decode("_-4=", Base64.WEB_SAFE));
+ assertEquals(BYTES, 3, Base64.decode("_-7d", Base64.WEB_SAFE));
+ assertEquals(BYTES, 4, Base64.decode("_-7dzA==", Base64.WEB_SAFE));
+ assertEquals(BYTES, 5, Base64.decode("_-7dzLs=", Base64.WEB_SAFE));
+ assertEquals(BYTES, 6, Base64.decode("_-7dzLuq", Base64.WEB_SAFE));
+ assertEquals(BYTES, 7, Base64.decode("_-7dzLuqmQ==", Base64.WEB_SAFE));
+ assertEquals(BYTES, 8, Base64.decode("_-7dzLuqmYg=", Base64.WEB_SAFE));
+
+ assertEquals("", Base64.encodeString(BYTES, 0, 0, Base64.WEB_SAFE));
+ assertEquals("_w==\n", Base64.encodeString(BYTES, 0, 1, Base64.WEB_SAFE));
+ assertEquals("_-4=\n", Base64.encodeString(BYTES, 0, 2, Base64.WEB_SAFE));
+ assertEquals("_-7d\n", Base64.encodeString(BYTES, 0, 3, Base64.WEB_SAFE));
+ assertEquals("_-7dzA==\n", Base64.encodeString(BYTES, 0, 4, Base64.WEB_SAFE));
+ assertEquals("_-7dzLs=\n", Base64.encodeString(BYTES, 0, 5, Base64.WEB_SAFE));
+ assertEquals("_-7dzLuq\n", Base64.encodeString(BYTES, 0, 6, Base64.WEB_SAFE));
+ assertEquals("_-7dzLuqmQ==\n", Base64.encodeString(BYTES, 0, 7, Base64.WEB_SAFE));
+ assertEquals("_-7dzLuqmYg=\n", Base64.encodeString(BYTES, 0, 8, Base64.WEB_SAFE));
+ }
+
+ public void testFlags() throws Exception {
+ assertEquals("YQ==\n", encodeString("a", 0));
+ assertEquals("YQ==", encodeString("a", Base64.NO_WRAP));
+ assertEquals("YQ\n", encodeString("a", Base64.NO_PADDING));
+ assertEquals("YQ", encodeString("a", Base64.NO_PADDING | Base64.NO_WRAP));
+ assertEquals("YQ==\r\n", encodeString("a", Base64.CRLF));
+ assertEquals("YQ\r\n", encodeString("a", Base64.CRLF | Base64.NO_PADDING));
+
+ assertEquals("YWI=\n", encodeString("ab", 0));
+ assertEquals("YWI=", encodeString("ab", Base64.NO_WRAP));
+ assertEquals("YWI\n", encodeString("ab", Base64.NO_PADDING));
+ assertEquals("YWI", encodeString("ab", Base64.NO_PADDING | Base64.NO_WRAP));
+ assertEquals("YWI=\r\n", encodeString("ab", Base64.CRLF));
+ assertEquals("YWI\r\n", encodeString("ab", Base64.CRLF | Base64.NO_PADDING));
+
+ assertEquals("YWJj\n", encodeString("abc", 0));
+ assertEquals("YWJj", encodeString("abc", Base64.NO_WRAP));
+ assertEquals("YWJj\n", encodeString("abc", Base64.NO_PADDING));
+ assertEquals("YWJj", encodeString("abc", Base64.NO_PADDING | Base64.NO_WRAP));
+ assertEquals("YWJj\r\n", encodeString("abc", Base64.CRLF));
+ assertEquals("YWJj\r\n", encodeString("abc", Base64.CRLF | Base64.NO_PADDING));
+
+ assertEquals("YWJjZA==\n", encodeString("abcd", 0));
+ assertEquals("YWJjZA==", encodeString("abcd", Base64.NO_WRAP));
+ assertEquals("YWJjZA\n", encodeString("abcd", Base64.NO_PADDING));
+ assertEquals("YWJjZA", encodeString("abcd", Base64.NO_PADDING | Base64.NO_WRAP));
+ assertEquals("YWJjZA==\r\n", encodeString("abcd", Base64.CRLF));
+ assertEquals("YWJjZA\r\n", encodeString("abcd", Base64.CRLF | Base64.NO_PADDING));
+ }
+
+ public void testLineLength() throws Exception {
+ String in_56 = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcd";
+ String in_57 = in_56 + "e";
+ String in_58 = in_56 + "ef";
+ String in_59 = in_56 + "efg";
+ String in_60 = in_56 + "efgh";
+ String in_61 = in_56 + "efghi";
+
+ String prefix = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXphYmNkZWZnaGlqa2xtbm9wcXJzdHV2d3h5emFi";
+ String out_56 = prefix + "Y2Q=\n";
+ String out_57 = prefix + "Y2Rl\n";
+ String out_58 = prefix + "Y2Rl\nZg==\n";
+ String out_59 = prefix + "Y2Rl\nZmc=\n";
+ String out_60 = prefix + "Y2Rl\nZmdo\n";
+ String out_61 = prefix + "Y2Rl\nZmdoaQ==\n";
+
+ // no newline for an empty input array.
+ assertEquals("", encodeString("", 0));
+
+ assertEquals(out_56, encodeString(in_56, 0));
+ assertEquals(out_57, encodeString(in_57, 0));
+ assertEquals(out_58, encodeString(in_58, 0));
+ assertEquals(out_59, encodeString(in_59, 0));
+ assertEquals(out_60, encodeString(in_60, 0));
+ assertEquals(out_61, encodeString(in_61, 0));
+
+ assertEquals(out_56.replaceAll("=", ""), encodeString(in_56, Base64.NO_PADDING));
+ assertEquals(out_57.replaceAll("=", ""), encodeString(in_57, Base64.NO_PADDING));
+ assertEquals(out_58.replaceAll("=", ""), encodeString(in_58, Base64.NO_PADDING));
+ assertEquals(out_59.replaceAll("=", ""), encodeString(in_59, Base64.NO_PADDING));
+ assertEquals(out_60.replaceAll("=", ""), encodeString(in_60, Base64.NO_PADDING));
+ assertEquals(out_61.replaceAll("=", ""), encodeString(in_61, Base64.NO_PADDING));
+
+ assertEquals(out_56.replaceAll("\n", ""), encodeString(in_56, Base64.NO_WRAP));
+ assertEquals(out_57.replaceAll("\n", ""), encodeString(in_57, Base64.NO_WRAP));
+ assertEquals(out_58.replaceAll("\n", ""), encodeString(in_58, Base64.NO_WRAP));
+ assertEquals(out_59.replaceAll("\n", ""), encodeString(in_59, Base64.NO_WRAP));
+ assertEquals(out_60.replaceAll("\n", ""), encodeString(in_60, Base64.NO_WRAP));
+ assertEquals(out_61.replaceAll("\n", ""), encodeString(in_61, Base64.NO_WRAP));
+ }
+}
