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Freedom for Media in Java
package net.sf.fmj.codegen;
/**
* Generic code-generation utilities, useful for creating unit tests.
*
* @author Ken Larson
*
*/
public class CGUtils
{
private static final int MAX_BYTE_PLUS1 = 256;
private static final int RADIX_16 = 16;
public static String byteArrayToHexString(byte[] array)
{
return byteArrayToHexString(array, array.length);
}
public static String byteArrayToHexString(byte[] array, int len)
{
return byteArrayToHexString(array, len, 0);
}
public static String byteArrayToHexString(byte[] array, int len, int offset)
{
StringBuffer b = new StringBuffer();
for (int i = 0; i < len; ++i)
{
String byteStr = Integer.toHexString(uByteToInt(array[offset + i]));
if (byteStr.length() == 1)
byteStr = "0" + byteStr;
b.append(byteStr);
}
return b.toString();
}
/**
* Dump to string using a debugger-like format - both hex and ascii.
*/
public static String dump(byte[] bytes, int offset, int byteslen)
{
final StringBuffer b = new StringBuffer();
final int width = 32;
int len = width;
while (offset < byteslen)
{
int remainder = 0;
if (offset + len > byteslen)
{
len = byteslen - offset;
remainder = width - len;
}
b.append(byteArrayToHexString(bytes, len, offset));
for (int i = 0; i < remainder; ++i)
{
b.append(" ");
}
b.append(" | ");
for (int i = 0; i < len; ++i)
{
byte c = bytes[offset + i];
if (c >= ' ' && c <= '~')
{
b.append((char) c);
} else
b.append('.');
}
b.append('\n');
offset += len;
}
return b.toString();
}
public static byte hexStringToByte(String s)
{
return (byte) Integer.parseInt(s, RADIX_16);
}
public static byte[] hexStringToByteArray(String s)
{
byte[] array = new byte[s.length() / 2];
for (int i = 0; i < array.length; ++i)
{
array[i] = hexStringToByte(s.substring(i * 2, i * 2 + 2));
}
return array;
}
public static String replaceSpecialJavaStringChars(String raw)
{
// TODO: non-printable characters.
if (raw == null)
{
return null;
}
final StringBuffer buf = new StringBuffer();
for (int i = 0; i < raw.length(); ++i)
{
char c = raw.charAt(i);
if (c == '\"')
buf.append("\\\"");
else if (c == '\'')
buf.append("\\\'");
else if (c == '\\')
buf.append("\\\\");
else if (c == '\r')
buf.append("\\r");
else if (c == '\n')
buf.append("\\n");
else if (c == '\t')
buf.append("\\t");
else if (c == '\f')
buf.append("\\f");
else if (c == '\b')
buf.append("\\b");
else if (c == (char) 0)
buf.append("\\000");
else
{
buf.append(c);
}
}
return buf.toString();
}
public static String toHexLiteral(int v)
{
return "0x" + Integer.toHexString(v);
}
public static String toLiteral(byte[] ba)
{
if (ba == null)
return "null";
else
{
StringBuffer buf = new StringBuffer();
buf.append("new byte[] {");
for (int i = 0; i < ba.length; ++i)
{
if (i > 0)
buf.append(", ");
buf.append("(byte)" + (int) ba[i]);
}
buf.append("}");
return buf.toString();
}
}
public static String toLiteral(double v)
{
return "" + v; // TODO
}
public static String toLiteral(float v)
{
return "" + v + "f";
}
public static String toLiteral(int v)
{
return "" + v;
}
public static String toLiteral(int[] ba)
{
if (ba == null)
return "null";
else
{
StringBuffer buf = new StringBuffer();
buf.append("new int[] {");
boolean first = true;
for (int i = 0; i < ba.length; ++i)
{
final int b = ba[i];
if (first)
first = false;
else
buf.append(",");
buf.append("" + b);
}
buf.append("}");
return buf.toString();
}
}
public static String toLiteral(long v)
{
return "" + v + "L";
}
public static String toLiteral(String s)
{
if (s == null)
return "null";
return "\"" + replaceSpecialJavaStringChars(s) + "\"";
}
static String toName(Class c)
{
if (c == int.class)
return "int";
else if (c == boolean.class)
return "boolean";
else if (c == short.class)
return "short";
else if (c == byte.class)
return "byte";
else if (c == char.class)
return "char";
else if (c == float.class)
return "float";
else if (c == double.class)
return "double";
else if (c == long.class)
return "long";
else if (c == byte[].class)
return "byte[]";
else if (c == int[].class)
return "int[]";
else if (c == short[].class)
return "short[]";
else if (c == double[].class)
return "double[]";
else if (c == float[].class)
return "float[]";
else if (c == long[].class)
return "long[]";
else if (c == boolean[].class)
return "boolean[]";
else if (c == char[].class)
return "char[]";
else if (c.isArray())
return "" + toName(c.getComponentType()) + "[]";
else
return "" + c.getName() + "";
}
public static String toNameDotClass(Class c)
{
if (c == null)
return null;
return toName(c) + ".class";
}
// because java does not support unsigned bytes, we can use this function to
// treat a byte as unsigned.
// TODO: duplicated in UnsignedUtils
public static int uByteToInt(byte b)
{
if (b >= 0)
return b;
else
return MAX_BYTE_PLUS1 + b;
}
}