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/*
* Copyright (C) 2012 The CyanogenMod 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.cyanogenmod.filemanager.util;
import android.text.TextUtils;
import com.android.internal.util.HexDump;
import java.io.ByteArrayInputStream;
import java.util.Arrays;
import java.util.UUID;
/**
* A helper class with useful methods for deal with strings.
*/
public final class StringHelper {
private static final char[] VALID_NON_PRINTABLE_CHARS = {' ', '\t', '\r', '\n'};
/**
* Method that check if a character is valid printable character
*
* @param c The character to check
* @return boolean If the character is printable
*/
public static boolean isPrintableCharacter(char c) {
int cc = VALID_NON_PRINTABLE_CHARS.length;
for (int i = 0; i < cc; i++) {
if (c == VALID_NON_PRINTABLE_CHARS[i]) {
return true;
}
}
return TextUtils.isGraphic(c);
}
public static boolean isBinaryData(byte[] data) {
int lastByteTranslated = 0;
final int read = Math.min(10 * 1024, data.length);
final long max = ((5 * read) / 100); // 5% percent of binary bytes
int hits = 0;
for (int i = 0; i < read; i++) {
final byte b = data[i];
int ub = b & (0xff); // unsigned
int utf8value = lastByteTranslated + ub;
lastByteTranslated = (ub) << 8;
if (ub == 0x09 /*(tab)*/
|| ub == 0x0A /*(line feed)*/
|| ub == 0x0C /*(form feed)*/
|| ub == 0x0D /*(carriage return)*/
|| (ub >= 0x20 && ub <= 0x7E) /* Letters, Numbers and other "normal symbols" */
|| (ub >= 0xA0 && ub <= 0xEE) /* Symbols of Latin-1 */
|| (utf8value >= 0x2E2E && utf8value <= 0xC3BF)) { /* Latin-1 in UTF-8 encoding */
// ok
} else {
// binary
hits++;
}
}
return hits > max;
}
/**
* Method that converts to a visual printable hex string
*
* @param string The string to check
*/
public static String toHexPrintableString(byte[] data) {
String hexLineSeparator = UUID.randomUUID().toString() + UUID.randomUUID().toString();
String hex = toHexDump(data, hexLineSeparator);
// Remove characters without visual representation
final String REPLACED_SYMBOL = "."; //$NON-NLS-1$
final String NEWLINE = System.getProperty("line.separator"); //$NON-NLS-1$
String printable = hex.replaceAll("\\p{Cntrl}", REPLACED_SYMBOL); //$NON-NLS-1$
printable = printable.replaceAll("[^\\p{Print}]", REPLACED_SYMBOL); //$NON-NLS-1$
printable = printable.replaceAll("\\p{C}", REPLACED_SYMBOL); //$NON-NLS-1$
printable = printable.replaceAll(hexLineSeparator, NEWLINE);
return printable;
}
/**
* Create a hex dump of the data while show progress to user
*
* @param data The data to hex dump
* @param hexLineSeparator Internal line separator
* @return StringBuilder The hex dump buffer
*/
private static String toHexDump(byte[] data, String hexLineSeparator) {
final int DISPLAY_SIZE = 16; // Bytes per line
ByteArrayInputStream bais = new ByteArrayInputStream(data);
byte[] line = new byte[DISPLAY_SIZE];
int read = 0;
int offset = 0;
StringBuilder sb = new StringBuilder();
while ((read = bais.read(line, 0, DISPLAY_SIZE)) != -1) {
//offset dump(16) data\n
String linedata = new String(line, 0, read);
sb.append(HexDump.toHexString(offset));
sb.append(" "); //$NON-NLS-1$
String hexDump = HexDump.toHexString(line, 0, read);
if (hexDump.length() != (DISPLAY_SIZE * 2)) {
char[] array = new char[(DISPLAY_SIZE * 2) - hexDump.length()];
Arrays.fill(array, ' ');
hexDump += new String(array);
}
sb.append(hexDump);
sb.append(" "); //$NON-NLS-1$
sb.append(linedata);
sb.append(hexLineSeparator);
offset += DISPLAY_SIZE;
}
return sb.toString();
}
}
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