dx/src/com/android/dx/util/Hex.java - platform/dalvik2 - Git at Google

 /*
  * Copyright (C) 2007 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.dx.util;

 /**
  * Utilities for formatting numbers as hexadecimal.
  */
 public final class Hex {
     /**
      * This class is uninstantiable.
      */
     private Hex() {
         // This space intentionally left blank.
     }

     /**
      * Formats a {@code long} as an 8-byte unsigned hex value.
      *
      * @param v value to format
      * @return {@code non-null;} formatted form
      */
     public static String u8(long v) {
         char[] result = new char[16];
         for (int i = 0; i < 16; i++) {
             result[15 - i] = Character.forDigit((int) v & 0x0f, 16);
             v >>= 4;
         }

         return new String(result);
     }

     /**
      * Formats an {@code int} as a 4-byte unsigned hex value.
      *
      * @param v value to format
      * @return {@code non-null;} formatted form
      */
     public static String u4(int v) {
         char[] result = new char[8];
         for (int i = 0; i < 8; i++) {
             result[7 - i] = Character.forDigit(v & 0x0f, 16);
             v >>= 4;
         }

         return new String(result);
     }

     /**
      * Formats an {@code int} as a 3-byte unsigned hex value.
      *
      * @param v value to format
      * @return {@code non-null;} formatted form
      */
     public static String u3(int v) {
         char[] result = new char[6];
         for (int i = 0; i < 6; i++) {
             result[5 - i] = Character.forDigit(v & 0x0f, 16);
             v >>= 4;
         }

         return new String(result);
     }

     /**
      * Formats an {@code int} as a 2-byte unsigned hex value.
      *
      * @param v value to format
      * @return {@code non-null;} formatted form
      */
     public static String u2(int v) {
         char[] result = new char[4];
         for (int i = 0; i < 4; i++) {
             result[3 - i] = Character.forDigit(v & 0x0f, 16);
             v >>= 4;
         }

         return new String(result);
     }

     /**
      * Formats an {@code int} as either a 2-byte unsigned hex value
      * (if the value is small enough) or a 4-byte unsigned hex value (if
      * not).
      *
      * @param v value to format
      * @return {@code non-null;} formatted form
      */
     public static String u2or4(int v) {
         if (v == (char) v) {
             return u2(v);
         } else {
             return u4(v);
         }
     }

     /**
      * Formats an {@code int} as a 1-byte unsigned hex value.
      *
      * @param v value to format
      * @return {@code non-null;} formatted form
      */
     public static String u1(int v) {
         char[] result = new char[2];
         for (int i = 0; i < 2; i++) {
             result[1 - i] = Character.forDigit(v & 0x0f, 16);
             v >>= 4;
         }

         return new String(result);
     }

     /**
      * Formats an {@code int} as a 4-bit unsigned hex nibble.
      *
      * @param v value to format
      * @return {@code non-null;} formatted form
      */
     public static String uNibble(int v) {
         char[] result = new char[1];

         result[0] = Character.forDigit(v & 0x0f, 16);
         return new String(result);
     }

     /**
      * Formats a {@code long} as an 8-byte signed hex value.
      *
      * @param v value to format
      * @return {@code non-null;} formatted form
      */
     public static String s8(long v) {
         char[] result = new char[17];

         if (v < 0) {
             result[0] = '-';
             v = -v;
         } else {
             result[0] = '+';
         }

         for (int i = 0; i < 16; i++) {
             result[16 - i] = Character.forDigit((int) v & 0x0f, 16);
             v >>= 4;
         }

         return new String(result);
     }

     /**
      * Formats an {@code int} as a 4-byte signed hex value.
      *
      * @param v value to format
      * @return {@code non-null;} formatted form
      */
     public static String s4(int v) {
         char[] result = new char[9];

         if (v < 0) {
             result[0] = '-';
             v = -v;
         } else {
             result[0] = '+';
         }

         for (int i = 0; i < 8; i++) {
             result[8 - i] = Character.forDigit(v & 0x0f, 16);
             v >>= 4;
         }

         return new String(result);
     }

     /**
      * Formats an {@code int} as a 2-byte signed hex value.
      *
      * @param v value to format
      * @return {@code non-null;} formatted form
      */
     public static String s2(int v) {
         char[] result = new char[5];

         if (v < 0) {
             result[0] = '-';
             v = -v;
         } else {
             result[0] = '+';
         }

         for (int i = 0; i < 4; i++) {
             result[4 - i] = Character.forDigit(v & 0x0f, 16);
             v >>= 4;
         }

         return new String(result);
     }

     /**
      * Formats an {@code int} as a 1-byte signed hex value.
      *
      * @param v value to format
      * @return {@code non-null;} formatted form
      */
     public static String s1(int v) {
         char[] result = new char[3];

         if (v < 0) {
             result[0] = '-';
             v = -v;
         } else {
             result[0] = '+';
         }

         for (int i = 0; i < 2; i++) {
             result[2 - i] = Character.forDigit(v & 0x0f, 16);
             v >>= 4;
         }

         return new String(result);
     }

     /**
      * Formats a hex dump of a portion of a {@code byte[]}. The result
      * is always newline-terminated, unless the passed-in length was zero,
      * in which case the result is always the empty string ({@code ""}).
      *
      * @param arr {@code non-null;} array to format
      * @param offset {@code >= 0;} offset to the part to dump
      * @param length {@code >= 0;} number of bytes to dump
      * @param outOffset {@code >= 0;} first output offset to print
      * @param bpl {@code >= 0;} number of bytes of output per line
      * @param addressLength {@code {2,4,6,8};} number of characters for each address
      * header
      * @return {@code non-null;} a string of the dump
      */
     public static String dump(byte[] arr, int offset, int length,
                               int outOffset, int bpl, int addressLength) {
         int end = offset + length;

         // twos-complement math trick: ((x < 0) || (y < 0)) <=> ((x|y) < 0)
         if (((offset | length | end) < 0) || (end > arr.length)) {
             throw new IndexOutOfBoundsException("arr.length " +
                                                 arr.length + "; " +
                                                 offset + "..!" + end);
         }

         if (outOffset < 0) {
             throw new IllegalArgumentException("outOffset < 0");
         }

         if (length == 0) {
             return "";
         }

         StringBuffer sb = new StringBuffer(length * 4 + 6);
         boolean bol = true;
         int col = 0;

         while (length > 0) {
             if (col == 0) {
                 String astr;
                 switch (addressLength) {
                     case 2:  astr = Hex.u1(outOffset); break;
                     case 4:  astr = Hex.u2(outOffset); break;
                     case 6:  astr = Hex.u3(outOffset); break;
                     default: astr = Hex.u4(outOffset); break;
                 }
                 sb.append(astr);
                 sb.append(": ");
             } else if ((col & 1) == 0) {
                 sb.append(' ');
             }
             sb.append(Hex.u1(arr[offset]));
             outOffset++;
             offset++;
             col++;
             if (col == bpl) {
                 sb.append('\n');
                 col = 0;
             }
             length--;
         }

         if (col != 0) {
             sb.append('\n');
         }

         return sb.toString();
     }
 }
	/*
	* Copyright (C) 2007 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.dx.util;

	/**
	* Utilities for formatting numbers as hexadecimal.
	*/
	public final class Hex {
	/**
	* This class is uninstantiable.
	*/
	private Hex() {
	// This space intentionally left blank.
	}

	/**
	* Formats a {@code long} as an 8-byte unsigned hex value.
	*
	* @param v value to format
	* @return {@code non-null;} formatted form
	*/
	public static String u8(long v) {
	char[] result = new char[16];
	for (int i = 0; i < 16; i++) {
	result[15 - i] = Character.forDigit((int) v & 0x0f, 16);
	v >>= 4;
	}

	return new String(result);
	}

	/**
	* Formats an {@code int} as a 4-byte unsigned hex value.
	*
	* @param v value to format
	* @return {@code non-null;} formatted form
	*/
	public static String u4(int v) {
	char[] result = new char[8];
	for (int i = 0; i < 8; i++) {
	result[7 - i] = Character.forDigit(v & 0x0f, 16);
	v >>= 4;
	}

	return new String(result);
	}

	/**
	* Formats an {@code int} as a 3-byte unsigned hex value.
	*
	* @param v value to format
	* @return {@code non-null;} formatted form
	*/
	public static String u3(int v) {
	char[] result = new char[6];
	for (int i = 0; i < 6; i++) {
	result[5 - i] = Character.forDigit(v & 0x0f, 16);
	v >>= 4;
	}

	return new String(result);
	}

	/**
	* Formats an {@code int} as a 2-byte unsigned hex value.
	*
	* @param v value to format
	* @return {@code non-null;} formatted form
	*/
	public static String u2(int v) {
	char[] result = new char[4];
	for (int i = 0; i < 4; i++) {
	result[3 - i] = Character.forDigit(v & 0x0f, 16);
	v >>= 4;
	}

	return new String(result);
	}

	/**
	* Formats an {@code int} as either a 2-byte unsigned hex value
	* (if the value is small enough) or a 4-byte unsigned hex value (if
	* not).
	*
	* @param v value to format
	* @return {@code non-null;} formatted form
	*/
	public static String u2or4(int v) {
	if (v == (char) v) {
	return u2(v);
	} else {
	return u4(v);
	}
	}

	/**
	* Formats an {@code int} as a 1-byte unsigned hex value.
	*
	* @param v value to format
	* @return {@code non-null;} formatted form
	*/
	public static String u1(int v) {
	char[] result = new char[2];
	for (int i = 0; i < 2; i++) {
	result[1 - i] = Character.forDigit(v & 0x0f, 16);
	v >>= 4;
	}

	return new String(result);
	}

	/**
	* Formats an {@code int} as a 4-bit unsigned hex nibble.
	*
	* @param v value to format
	* @return {@code non-null;} formatted form
	*/
	public static String uNibble(int v) {
	char[] result = new char[1];

	result[0] = Character.forDigit(v & 0x0f, 16);
	return new String(result);
	}

	/**
	* Formats a {@code long} as an 8-byte signed hex value.
	*
	* @param v value to format
	* @return {@code non-null;} formatted form
	*/
	public static String s8(long v) {
	char[] result = new char[17];

	if (v < 0) {
	result[0] = '-';
	v = -v;
	} else {
	result[0] = '+';
	}

	for (int i = 0; i < 16; i++) {
	result[16 - i] = Character.forDigit((int) v & 0x0f, 16);
	v >>= 4;
	}

	return new String(result);
	}

	/**
	* Formats an {@code int} as a 4-byte signed hex value.
	*
	* @param v value to format
	* @return {@code non-null;} formatted form
	*/
	public static String s4(int v) {
	char[] result = new char[9];

	if (v < 0) {
	result[0] = '-';
	v = -v;
	} else {
	result[0] = '+';
	}

	for (int i = 0; i < 8; i++) {
	result[8 - i] = Character.forDigit(v & 0x0f, 16);
	v >>= 4;
	}

	return new String(result);
	}

	/**
	* Formats an {@code int} as a 2-byte signed hex value.
	*
	* @param v value to format
	* @return {@code non-null;} formatted form
	*/
	public static String s2(int v) {
	char[] result = new char[5];

	if (v < 0) {
	result[0] = '-';
	v = -v;
	} else {
	result[0] = '+';
	}

	for (int i = 0; i < 4; i++) {
	result[4 - i] = Character.forDigit(v & 0x0f, 16);
	v >>= 4;
	}

	return new String(result);
	}

	/**
	* Formats an {@code int} as a 1-byte signed hex value.
	*
	* @param v value to format
	* @return {@code non-null;} formatted form
	*/
	public static String s1(int v) {
	char[] result = new char[3];

	if (v < 0) {
	result[0] = '-';
	v = -v;
	} else {
	result[0] = '+';
	}

	for (int i = 0; i < 2; i++) {
	result[2 - i] = Character.forDigit(v & 0x0f, 16);
	v >>= 4;
	}

	return new String(result);
	}

	/**
	* Formats a hex dump of a portion of a {@code byte[]}. The result
	* is always newline-terminated, unless the passed-in length was zero,
	* in which case the result is always the empty string ({@code ""}).
	*
	* @param arr {@code non-null;} array to format
	* @param offset {@code >= 0;} offset to the part to dump
	* @param length {@code >= 0;} number of bytes to dump
	* @param outOffset {@code >= 0;} first output offset to print
	* @param bpl {@code >= 0;} number of bytes of output per line
	* @param addressLength {@code {2,4,6,8};} number of characters for each address
	* header
	* @return {@code non-null;} a string of the dump
	*/
	public static String dump(byte[] arr, int offset, int length,
	int outOffset, int bpl, int addressLength) {
	int end = offset + length;

	// twos-complement math trick: ((x < 0) \|\| (y < 0)) <=> ((x\|y) < 0)
	if (((offset \| length \| end) < 0) \|\| (end > arr.length)) {
	throw new IndexOutOfBoundsException("arr.length " +
	arr.length + "; " +
	offset + "..!" + end);
	}

	if (outOffset < 0) {
	throw new IllegalArgumentException("outOffset < 0");
	}

	if (length == 0) {
	return "";
	}

	StringBuffer sb = new StringBuffer(length * 4 + 6);
	boolean bol = true;
	int col = 0;

	while (length > 0) {
	if (col == 0) {
	String astr;
	switch (addressLength) {
	case 2: astr = Hex.u1(outOffset); break;
	case 4: astr = Hex.u2(outOffset); break;
	case 6: astr = Hex.u3(outOffset); break;
	default: astr = Hex.u4(outOffset); break;
	}
	sb.append(astr);
	sb.append(": ");
	} else if ((col & 1) == 0) {
	sb.append(' ');
	}
	sb.append(Hex.u1(arr[offset]));
	outOffset++;
	offset++;
	col++;
	if (col == bpl) {
	sb.append('\n');
	col = 0;
	}
	length--;
	}

	if (col != 0) {
	sb.append('\n');
	}

	return sb.toString();
	}
	}