Note regarding UTF-8. * The JVMS defines its own version of the UTF-8 format so that it * contains no zero bytes (modified UTF-8). This is not actually the same * as Charset.forName("UTF-8"). * *
* See also: *
* * The methods here support modified UTF-8. * *This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.
*/
public class Convert {
/** Convert string to integer.
*/
public static int string2int(String s, int radix)
throws NumberFormatException {
if (radix == 10) {
return Integer.parseInt(s, radix);
} else {
char[] cs = s.toCharArray();
int limit = Integer.MAX_VALUE / (radix/2);
int n = 0;
for (char c : cs) {
int d = Character.digit(c, radix);
if (n < 0 ||
n > limit ||
n * radix > Integer.MAX_VALUE - d)
throw new NumberFormatException();
n = n * radix + d;
}
return n;
}
}
/** Convert string to long integer.
*/
public static long string2long(String s, int radix)
throws NumberFormatException {
if (radix == 10) {
return Long.parseLong(s, radix);
} else {
char[] cs = s.toCharArray();
long limit = Long.MAX_VALUE / (radix/2);
long n = 0;
for (char c : cs) {
int d = Character.digit(c, radix);
if (n < 0 ||
n > limit ||
n * radix > Long.MAX_VALUE - d)
throw new NumberFormatException();
n = n * radix + d;
}
return n;
}
}
/* Conversion routines between names, strings, and byte arrays in Utf8 format
*/
/** Validate the given Modified UTF-8 encoding using the given validation level.
* Reject invalid data by throwing an {@link InvalidUtfException}.
* Note: there is no point in calling this method with {@link Validation#NONE}.
* @param buf Buffer containing data
* @param off Data starting offset
* @param len Data length
* @param validation Level of validation
* @throws InvalidUtfException if {@code validation} is not {@link Validation#NONE}
* and invalid Modified UTF-8 is encountered
*/
public static void utfValidate(byte[] buf, int off, int len, Validation validation) throws InvalidUtfException {
utf2chars(buf, off, null, 0, len, validation);
}
/** Decode characters encoded in Modified UTF-8 encoding using the given validation level.
* Reject any invalid data by throwing an {@link InvalidUtfException}.
* Parameters are as in System.arraycopy():
* @param src The array holding the bytes to convert.
* @param soff The start index from which bytes are converted.
* @param dst The array holding the converted characters,
* or null to just validate
* @param doff The start index from which converted characters
* are written.
* @param len The maximum number of bytes to convert.
* @param validation Level of validation
* @throws InvalidUtfException if invalid Modified UTF-8 is encountered
* @return the index in {@code dst} just after the last copied char
* @throws InvalidUtfException if {@code validation} is not {@link Validation#NONE}
* and invalid Modified UTF-8 is encountered
*/
public static int utf2chars(byte[] src, int soff, char[] dst, int doff, int len, Validation validation)
throws InvalidUtfException {
final int doff0 = doff;
while (len-- > 0) {
final int soff0 = soff;
int value = src[soff++];
if (value < 0) {
if ((value & 0xe0) == 0xc0) {
int value2;
if (len-- > 0)
value2 = src[soff++];
else if (validation.allowAnything())
value2 = 0;
else
throw new InvalidUtfException(soff0);
if (!validation.allowAnything() && (value2 & 0xc0) != 0x80)
throw new InvalidUtfException(soff0);
value = ((value & 0x1f) << 6) | (value2 & 0x3f);
if (!validation.allowLongEncoding() && (value & ~0x7f) == 0 && value != 0)
throw new InvalidUtfException(soff0); // could have been one byte
} else if ((value & 0xf0) == 0xe0) {
int value2;
int value3;
if ((len -= 2) >= 0) {
value2 = src[soff++];
value3 = src[soff++];
} else if (validation.allowAnything()) {
value2 = 0;
value3 = 0;
} else
throw new InvalidUtfException(soff0);
if (!validation.allowAnything() && ((value2 & 0xc0) != 0x80 || (value3 & 0xc0) != 0x80))
throw new InvalidUtfException(soff0);
value = ((value & 0x0f) << 12) | ((value2 & 0x3f) << 6) | (value3 & 0x3f);
if (!validation.allowLongEncoding() && (value & ~0x7ff) == 0)
throw new InvalidUtfException(soff0); // could have been two bytes
} else if (validation.allowAnything())
value &= 0xff;
else
throw new InvalidUtfException(soff0);
} else if (!validation.allowSingleByteNul() && value == 0)
throw new InvalidUtfException(soff0); // 0x0000 must be encoded as two bytes
if (dst != null)
dst[doff] = (char)value;
doff++;
}
return doff - doff0;
}
/** Decode characters encoded in Modified UTF-8 encoding.
* @param src The array holding the bytes.
* @param sindex The start index from which bytes are converted.
* @param len The maximum number of bytes to convert.
* @param validation Level of validation
* @return The decoded characters in an array.
* @throws InvalidUtfException if {@code validation} is not {@link Validation#NONE}
* and invalid Modified UTF-8 is encountered
*/
public static char[] utf2chars(byte[] src, int sindex, int len, Validation validation)
throws InvalidUtfException {
char[] dst = new char[len];
int len1 = utf2chars(src, sindex, dst, 0, len, validation);
if (len1 == len)
return dst;
char[] result = new char[len1];
System.arraycopy(dst, 0, result, 0, len1);
return result;
}
/** Decode a {@link String} encoded in Modified UTF-8 encoding.
* @param src The array holding the bytes.
* @param sindex The start index from which bytes are converted.
* @param len The maximum number of bytes to convert.
* @param validation Level of validation
* @throws InvalidUtfException if {@code validation} is not {@link Validation#NONE}
* and invalid Modified UTF-8 is encountered
*/
public static String utf2string(byte[] src, int sindex, int len, Validation validation)
throws InvalidUtfException {
char dst[] = new char[len];
int len1 = utf2chars(src, sindex, dst, 0, len, validation);
return new String(dst, 0, len1);
}
/** Count the number of characters encoded in a Modified UTF-8 encoding.
* This method does not check for invalid data.
* @param buf data buffer
* @param off starting offset of UTF-8 data
* @param len number of bytes of UTF-8 data
* @return the number of encoded characters
*/
public static int utfNumChars(byte[] buf, int off, int len) {
int numChars = 0;
while (len-- > 0) {
if ((buf[off++] & 0xc0) != 0x80)
numChars++;
}
return numChars;
}
/** Copy characters in source array to bytes in target array,
* converting them to Utf8 representation.
* The target array must be large enough to hold the result.
* returns first index in `dst' past the last copied byte.
* @param src The array holding the characters to convert.
* @param sindex The start index from which characters are converted.
* @param dst The array holding the converted characters..
* @param dindex The start index from which converted bytes
* are written.
* @param len The maximum number of characters to convert.
*/
public static int chars2utf(char[] src, int sindex,
byte[] dst, int dindex,
int len) {
int j = dindex;
int limit = sindex + len;
for (int i = sindex; i < limit; i++) {
char ch = src[i];
if (1 <= ch && ch <= 0x7F) {
dst[j++] = (byte)ch;
} else if (ch <= 0x7FF) {
dst[j++] = (byte)(0xC0 | (ch >> 6));
dst[j++] = (byte)(0x80 | (ch & 0x3F));
} else {
dst[j++] = (byte)(0xE0 | (ch >> 12));
dst[j++] = (byte)(0x80 | ((ch >> 6) & 0x3F));
dst[j++] = (byte)(0x80 | (ch & 0x3F));
}
}
return j;
}
/** Return characters as an array of bytes in Utf8 representation.
* @param src The array holding the characters.
* @param sindex The start index from which characters are converted.
* @param len The maximum number of characters to convert.
*/
public static byte[] chars2utf(char[] src, int sindex, int len) {
byte[] dst = new byte[len * 3];
int len1 = chars2utf(src, sindex, dst, 0, len);
byte[] result = new byte[len1];
System.arraycopy(dst, 0, result, 0, len1);
return result;
}
/** Return all characters in given array as an array of bytes
* in Utf8 representation.
* @param src The array holding the characters.
*/
public static byte[] chars2utf(char[] src) {
return chars2utf(src, 0, src.length);
}
/** Return string as an array of bytes in in Utf8 representation.
*/
public static byte[] string2utf(String s) {
return chars2utf(s.toCharArray());
}
/**
* Escapes each character in a string that has an escape sequence or
* is non-printable ASCII. Leaves non-ASCII characters alone.
*/
public static String quote(String s) {
StringBuilder buf = new StringBuilder();
for (int i = 0; i < s.length(); i++) {
buf.append(quote(s.charAt(i), false));
}
return buf.toString();
}
/**
* Escapes a character if it has an escape sequence or is
* non-printable ASCII. Leaves non-ASCII characters alone.
*/
public static String quote(char ch, boolean charContext) {
/*
* In a char context, single quote (') must be escaped and
* double quote (") need not be escaped. In a non-char
* context, in other words a string context, the reverse is
* true.
*/
switch (ch) {
case '\b': return "\\b";
case '\f': return "\\f";
case '\n': return "\\n";
case '\r': return "\\r";
case '\t': return "\\t";
case '\'': return (charContext ? "\\'" : "'");
case '\"': return (charContext ? "\"" : "\\\"");
case '\\': return "\\\\";
default:
return (isPrintableAscii(ch))
? String.valueOf(ch)
: String.format("\\u%04x", (int) ch);
}
}
/**
* Is a character printable ASCII?
*/
private static boolean isPrintableAscii(char ch) {
return ch >= ' ' && ch <= '~';
}
/** Escape all unicode characters in string.
*/
public static String escapeUnicode(String s) {
int len = s.length();
int i = 0;
while (i < len) {
char ch = s.charAt(i);
if (ch > 255) {
StringBuilder buf = new StringBuilder();
buf.append(s.substring(0, i));
while (i < len) {
ch = s.charAt(i);
if (ch > 255) {
buf.append("\\u");
buf.append(Character.forDigit((ch >> 12) % 16, 16));
buf.append(Character.forDigit((ch >> 8) % 16, 16));
buf.append(Character.forDigit((ch >> 4) % 16, 16));
buf.append(Character.forDigit((ch ) % 16, 16));
} else {
buf.append(ch);
}
i++;
}
s = buf.toString();
} else {
i++;
}
}
return s;
}
/* Conversion routines for qualified name splitting
*/
/** Return the last part of a qualified name.
* @param name the qualified name
* @return the last part of the qualified name
*/
public static Name shortName(Name name) {
int start = name.lastIndexOfAscii('.') + 1;
return start > 0 ? name.subName(start) : name;
}
/** Return the last part of a qualified name from its string representation
* @param name the string representation of the qualified name
* @return the last part of the qualified name
*/
public static String shortName(String name) {
return name.substring(name.lastIndexOf('.') + 1);
}
/** Return the package name of a class name, excluding the trailing '.',
* "" if not existent.
*/
public static Name packagePart(Name classname) {
int end = Math.max(classname.lastIndexOfAscii('.'), 0);
return classname.subName(0, end);
}
public static String packagePart(String classname) {
int lastDot = classname.lastIndexOf('.');
return (lastDot < 0 ? "" : classname.substring(0, lastDot));
}
public static List