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⏎ sun/net/www/ParseUtil.java
/*
* Copyright (c) 1998, 2007, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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*/
package sun.net.www;
import java.io.File;
import java.net.URL;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import sun.nio.cs.ThreadLocalCoders;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CoderResult;
import java.nio.charset.CodingErrorAction;
/**
* A class that contains useful routines common to sun.net.www
* @author Mike McCloskey
*/
public final class ParseUtil {
private ParseUtil() {}
/**
* Constructs an encoded version of the specified path string suitable
* for use in the construction of a URL.
*
* A path separator is replaced by a forward slash. The string is UTF8
* encoded. The % escape sequence is used for characters that are above
* 0x7F or those defined in RFC2396 as reserved or excluded in the path
* component of a URL.
*/
public static String encodePath(String path) {
return encodePath(path, true);
}
/*
* flag indicates whether path uses platform dependent
* File.separatorChar or not. True indicates path uses platform
* dependent File.separatorChar.
*/
public static String encodePath(String path, boolean flag) {
if (flag && File.separatorChar != '/') {
return encodePath(path, 0, File.separatorChar);
} else {
int index = firstEncodeIndex(path);
if (index > -1) {
return encodePath(path, index, '/');
} else {
return path;
}
}
}
private static int firstEncodeIndex(String path) {
int len = path.length();
for (int i = 0; i < len; i++) {
char c = path.charAt(i);
// Ordering in the following test is performance sensitive,
// and typically paths have most chars in the a-z range, then
// in the symbol range '&'-':' (includes '.', '/' and '0'-'9')
// and more rarely in the A-Z range.
if (c >= 'a' && c <= 'z' ||
c >= '&' && c <= ':' ||
c >= 'A' && c <= 'Z') {
continue;
} else if (c > 0x007F || match(c, L_ENCODED, H_ENCODED)) {
return i;
}
}
return -1;
}
private static String encodePath(String path, int index, char sep) {
char[] pathCC = path.toCharArray();
char[] retCC = new char[pathCC.length * 2 + 16 - index];
if (index > 0) {
System.arraycopy(pathCC, 0, retCC, 0, index);
}
int retLen = index;
for (int i = index; i < pathCC.length; i++) {
char c = pathCC[i];
if (c == sep)
retCC[retLen++] = '/';
else {
if (c <= 0x007F) {
if (c >= 'a' && c <= 'z' ||
c >= 'A' && c <= 'Z' ||
c >= '0' && c <= '9') {
retCC[retLen++] = c;
} else if (match(c, L_ENCODED, H_ENCODED)) {
retLen = escape(retCC, c, retLen);
} else {
retCC[retLen++] = c;
}
} else if (c > 0x07FF) {
retLen = escape(retCC, (char)(0xE0 | ((c >> 12) & 0x0F)), retLen);
retLen = escape(retCC, (char)(0x80 | ((c >> 6) & 0x3F)), retLen);
retLen = escape(retCC, (char)(0x80 | ((c >> 0) & 0x3F)), retLen);
} else {
retLen = escape(retCC, (char)(0xC0 | ((c >> 6) & 0x1F)), retLen);
retLen = escape(retCC, (char)(0x80 | ((c >> 0) & 0x3F)), retLen);
}
}
//worst case scenario for character [0x7ff-] every single
//character will be encoded into 9 characters.
if (retLen + 9 > retCC.length) {
int newLen = retCC.length * 2 + 16;
if (newLen < 0) {
newLen = Integer.MAX_VALUE;
}
char[] buf = new char[newLen];
System.arraycopy(retCC, 0, buf, 0, retLen);
retCC = buf;
}
}
return new String(retCC, 0, retLen);
}
/**
* Appends the URL escape sequence for the specified char to the
* specified StringBuffer.
*/
private static int escape(char[] cc, char c, int index) {
cc[index++] = '%';
cc[index++] = Character.forDigit((c >> 4) & 0xF, 16);
cc[index++] = Character.forDigit(c & 0xF, 16);
return index;
}
/**
* Un-escape and return the character at position i in string s.
*/
private static byte unescape(String s, int i) {
return (byte) Integer.parseInt(s, i + 1, i + 3, 16);
}
/**
* Returns a new String constructed from the specified String by replacing
* the URL escape sequences and UTF8 encoding with the characters they
* represent.
*/
public static String decode(String s) {
int n = s.length();
if ((n == 0) || (s.indexOf('%') < 0))
return s;
StringBuilder sb = new StringBuilder(n);
ByteBuffer bb = ByteBuffer.allocate(n);
CharBuffer cb = CharBuffer.allocate(n);
CharsetDecoder dec = ThreadLocalCoders.decoderFor("UTF-8")
.onMalformedInput(CodingErrorAction.REPORT)
.onUnmappableCharacter(CodingErrorAction.REPORT);
char c = s.charAt(0);
for (int i = 0; i < n;) {
assert c == s.charAt(i);
if (c != '%') {
sb.append(c);
if (++i >= n)
break;
c = s.charAt(i);
continue;
}
bb.clear();
int ui = i;
for (;;) {
assert (n - i >= 2);
try {
bb.put(unescape(s, i));
} catch (NumberFormatException e) {
throw new IllegalArgumentException();
}
i += 3;
if (i >= n)
break;
c = s.charAt(i);
if (c != '%')
break;
}
bb.flip();
cb.clear();
dec.reset();
CoderResult cr = dec.decode(bb, cb, true);
if (cr.isError())
throw new IllegalArgumentException("Error decoding percent encoded characters");
cr = dec.flush(cb);
if (cr.isError())
throw new IllegalArgumentException("Error decoding percent encoded characters");
sb.append(cb.flip().toString());
}
return sb.toString();
}
/**
* Returns a canonical version of the specified string.
*/
public static String canonizeString(String file) {
int len = file.length();
if (len == 0 || (file.indexOf("./") == -1 && file.charAt(len - 1) != '.')) {
return file;
} else {
return doCanonize(file);
}
}
private static String doCanonize(String file) {
int i, lim;
// Remove embedded /../
while ((i = file.indexOf("/../")) >= 0) {
if ((lim = file.lastIndexOf('/', i - 1)) >= 0) {
file = file.substring(0, lim) + file.substring(i + 3);
} else {
file = file.substring(i + 3);
}
}
// Remove embedded /./
while ((i = file.indexOf("/./")) >= 0) {
file = file.substring(0, i) + file.substring(i + 2);
}
// Remove trailing ..
while (file.endsWith("/..")) {
i = file.indexOf("/..");
if ((lim = file.lastIndexOf('/', i - 1)) >= 0) {
file = file.substring(0, lim+1);
} else {
file = file.substring(0, i);
}
}
// Remove trailing .
if (file.endsWith("/."))
file = file.substring(0, file.length() -1);
return file;
}
public static URL fileToEncodedURL(File file)
throws MalformedURLException
{
String path = file.getAbsolutePath();
path = ParseUtil.encodePath(path);
if (!path.startsWith("/")) {
path = "/" + path;
}
if (!path.endsWith("/") && file.isDirectory()) {
path = path + "/";
}
return new URL("file", "", path);
}
public static java.net.URI toURI(URL url) {
String protocol = url.getProtocol();
String auth = url.getAuthority();
String path = url.getPath();
String query = url.getQuery();
String ref = url.getRef();
if (path != null && !(path.startsWith("/")))
path = "/" + path;
//
// In java.net.URI class, a port number of -1 implies the default
// port number. So get it stripped off before creating URI instance.
//
if (auth != null && auth.endsWith(":-1"))
auth = auth.substring(0, auth.length() - 3);
java.net.URI uri;
try {
uri = createURI(protocol, auth, path, query, ref);
} catch (java.net.URISyntaxException e) {
uri = null;
}
return uri;
}
//
// createURI() and its auxiliary code are cloned from java.net.URI.
// Most of the code are just copy and paste, except that quote()
// has been modified to avoid double-escape.
//
// Usually it is unacceptable, but we're forced to do it because
// otherwise we need to change public API, namely java.net.URI's
// multi-argument constructors. It turns out that the changes cause
// incompatibilities so can't be done.
//
private static URI createURI(String scheme,
String authority,
String path,
String query,
String fragment) throws URISyntaxException
{
String s = toString(scheme, null,
authority, null, null, -1,
path, query, fragment);
checkPath(s, scheme, path);
return new URI(s);
}
private static String toString(String scheme,
String opaquePart,
String authority,
String userInfo,
String host,
int port,
String path,
String query,
String fragment)
{
StringBuffer sb = new StringBuffer();
if (scheme != null) {
sb.append(scheme);
sb.append(':');
}
appendSchemeSpecificPart(sb, opaquePart,
authority, userInfo, host, port,
path, query);
appendFragment(sb, fragment);
return sb.toString();
}
private static void appendSchemeSpecificPart(StringBuffer sb,
String opaquePart,
String authority,
String userInfo,
String host,
int port,
String path,
String query)
{
if (opaquePart != null) {
/* check if SSP begins with an IPv6 address
* because we must not quote a literal IPv6 address
*/
if (opaquePart.startsWith("//[")) {
int end = opaquePart.indexOf(']');
if (end != -1 && opaquePart.indexOf(':')!=-1) {
String doquote, dontquote;
if (end == opaquePart.length()) {
dontquote = opaquePart;
doquote = "";
} else {
dontquote = opaquePart.substring(0,end+1);
doquote = opaquePart.substring(end+1);
}
sb.append (dontquote);
sb.append(quote(doquote, L_URIC, H_URIC));
}
} else {
sb.append(quote(opaquePart, L_URIC, H_URIC));
}
} else {
appendAuthority(sb, authority, userInfo, host, port);
if (path != null)
sb.append(quote(path, L_PATH, H_PATH));
if (query != null) {
sb.append('?');
sb.append(quote(query, L_URIC, H_URIC));
}
}
}
private static void appendAuthority(StringBuffer sb,
String authority,
String userInfo,
String host,
int port)
{
if (host != null) {
sb.append("//");
if (userInfo != null) {
sb.append(quote(userInfo, L_USERINFO, H_USERINFO));
sb.append('@');
}
boolean needBrackets = ((host.indexOf(':') >= 0)
&& !host.startsWith("[")
&& !host.endsWith("]"));
if (needBrackets) sb.append('[');
sb.append(host);
if (needBrackets) sb.append(']');
if (port != -1) {
sb.append(':');
sb.append(port);
}
} else if (authority != null) {
sb.append("//");
if (authority.startsWith("[")) {
int end = authority.indexOf(']');
if (end != -1 && authority.indexOf(':')!=-1) {
String doquote, dontquote;
if (end == authority.length()) {
dontquote = authority;
doquote = "";
} else {
dontquote = authority.substring(0,end+1);
doquote = authority.substring(end+1);
}
sb.append (dontquote);
sb.append(quote(doquote,
L_REG_NAME | L_SERVER,
H_REG_NAME | H_SERVER));
}
} else {
sb.append(quote(authority,
L_REG_NAME | L_SERVER,
H_REG_NAME | H_SERVER));
}
}
}
private static void appendFragment(StringBuffer sb, String fragment) {
if (fragment != null) {
sb.append('#');
sb.append(quote(fragment, L_URIC, H_URIC));
}
}
// Quote any characters in s that are not permitted
// by the given mask pair
//
private static String quote(String s, long lowMask, long highMask) {
int n = s.length();
StringBuffer sb = null;
boolean allowNonASCII = ((lowMask & L_ESCAPED) != 0);
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (c < '\u0080') {
if (!match(c, lowMask, highMask) && !isEscaped(s, i)) {
if (sb == null) {
sb = new StringBuffer();
sb.append(s, 0, i);
}
appendEscape(sb, (byte)c);
} else {
if (sb != null)
sb.append(c);
}
} else if (allowNonASCII
&& (Character.isSpaceChar(c)
|| Character.isISOControl(c))) {
if (sb == null) {
sb = new StringBuffer();
sb.append(s, 0, i);
}
appendEncoded(sb, c);
} else {
if (sb != null)
sb.append(c);
}
}
return (sb == null) ? s : sb.toString();
}
//
// To check if the given string has an escaped triplet
// at the given position
//
private static boolean isEscaped(String s, int pos) {
if (s == null || (s.length() <= (pos + 2)))
return false;
return s.charAt(pos) == '%'
&& match(s.charAt(pos + 1), L_HEX, H_HEX)
&& match(s.charAt(pos + 2), L_HEX, H_HEX);
}
private static void appendEncoded(StringBuffer sb, char c) {
ByteBuffer bb = null;
try {
bb = ThreadLocalCoders.encoderFor("UTF-8")
.encode(CharBuffer.wrap("" + c));
} catch (CharacterCodingException x) {
assert false;
}
while (bb.hasRemaining()) {
int b = bb.get() & 0xff;
if (b >= 0x80)
appendEscape(sb, (byte)b);
else
sb.append((char)b);
}
}
private static final char[] hexDigits = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
};
private static void appendEscape(StringBuffer sb, byte b) {
sb.append('%');
sb.append(hexDigits[(b >> 4) & 0x0f]);
sb.append(hexDigits[(b >> 0) & 0x0f]);
}
// Tell whether the given character is permitted by the given mask pair
private static boolean match(char c, long lowMask, long highMask) {
if (c < 64)
return ((1L << c) & lowMask) != 0;
if (c < 128)
return ((1L << (c - 64)) & highMask) != 0;
return false;
}
// If a scheme is given then the path, if given, must be absolute
//
private static void checkPath(String s, String scheme, String path)
throws URISyntaxException
{
if (scheme != null) {
if ((path != null)
&& ((path.length() > 0) && (path.charAt(0) != '/')))
throw new URISyntaxException(s,
"Relative path in absolute URI");
}
}
// -- Character classes for parsing --
// To save startup time, we manually calculate the low-/highMask constants.
// For reference, the following methods were used to calculate the values:
// Compute a low-order mask for the characters
// between first and last, inclusive
// private static long lowMask(char first, char last) {
// long m = 0;
// int f = Math.max(Math.min(first, 63), 0);
// int l = Math.max(Math.min(last, 63), 0);
// for (int i = f; i <= l; i++)
// m |= 1L << i;
// return m;
// }
// Compute the low-order mask for the characters in the given string
// private static long lowMask(String chars) {
// int n = chars.length();
// long m = 0;
// for (int i = 0; i < n; i++) {
// char c = chars.charAt(i);
// if (c < 64)
// m |= (1L << c);
// }
// return m;
// }
// Compute a high-order mask for the characters
// between first and last, inclusive
// private static long highMask(char first, char last) {
// long m = 0;
// int f = Math.max(Math.min(first, 127), 64) - 64;
// int l = Math.max(Math.min(last, 127), 64) - 64;
// for (int i = f; i <= l; i++)
// m |= 1L << i;
// return m;
// }
// Compute the high-order mask for the characters in the given string
// private static long highMask(String chars) {
// int n = chars.length();
// long m = 0;
// for (int i = 0; i < n; i++) {
// char c = chars.charAt(i);
// if ((c >= 64) && (c < 128))
// m |= (1L << (c - 64));
// }
// return m;
// }
// Character-class masks
// digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" |
// "8" | "9"
private static final long L_DIGIT = 0x3FF000000000000L; // lowMask('0', '9');
private static final long H_DIGIT = 0L;
// hex = digit | "A" | "B" | "C" | "D" | "E" | "F" |
// "a" | "b" | "c" | "d" | "e" | "f"
private static final long L_HEX = L_DIGIT;
private static final long H_HEX = 0x7E0000007EL; // highMask('A', 'F') | highMask('a', 'f');
// upalpha = "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"
private static final long L_UPALPHA = 0L;
private static final long H_UPALPHA = 0x7FFFFFEL; // highMask('A', 'Z');
// lowalpha = "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"
private static final long L_LOWALPHA = 0L;
private static final long H_LOWALPHA = 0x7FFFFFE00000000L; // highMask('a', 'z');
// alpha = lowalpha | upalpha
private static final long L_ALPHA = L_LOWALPHA | L_UPALPHA;
private static final long H_ALPHA = H_LOWALPHA | H_UPALPHA;
// alphanum = alpha | digit
private static final long L_ALPHANUM = L_DIGIT | L_ALPHA;
private static final long H_ALPHANUM = H_DIGIT | H_ALPHA;
// mark = "-" | "_" | "." | "!" | "~" | "*" | "'" |
// "(" | ")"
private static final long L_MARK = 0x678200000000L; // lowMask("-_.!~*'()");
private static final long H_MARK = 0x4000000080000000L; // highMask("-_.!~*'()");
// unreserved = alphanum | mark
private static final long L_UNRESERVED = L_ALPHANUM | L_MARK;
private static final long H_UNRESERVED = H_ALPHANUM | H_MARK;
// reserved = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" |
// "$" | "," | "[" | "]"
// Added per RFC2732: "[", "]"
private static final long L_RESERVED = 0xAC00985000000000L; // lowMask(";/?:@&=+$,[]");
private static final long H_RESERVED = 0x28000001L; // highMask(";/?:@&=+$,[]");
// The zero'th bit is used to indicate that escape pairs and non-US-ASCII
// characters are allowed; this is handled by the scanEscape method below.
private static final long L_ESCAPED = 1L;
private static final long H_ESCAPED = 0L;
// uric = reserved | unreserved | escaped
private static final long L_URIC = L_RESERVED | L_UNRESERVED | L_ESCAPED;
private static final long H_URIC = H_RESERVED | H_UNRESERVED | H_ESCAPED;
// pchar = unreserved | escaped |
// ":" | "@" | "&" | "=" | "+" | "$" | ","
private static final long L_PCHAR
= L_UNRESERVED | L_ESCAPED | 0x2400185000000000L; // lowMask(":@&=+$,");
private static final long H_PCHAR
= H_UNRESERVED | H_ESCAPED | 0x1L; // highMask(":@&=+$,");
// All valid path characters
private static final long L_PATH = L_PCHAR | 0x800800000000000L; // lowMask(";/");
private static final long H_PATH = H_PCHAR; // highMask(";/") == 0x0L;
// Dash, for use in domainlabel and toplabel
private static final long L_DASH = 0x200000000000L; // lowMask("-");
private static final long H_DASH = 0x0L; // highMask("-");
// userinfo = *( unreserved | escaped |
// ";" | ":" | "&" | "=" | "+" | "$" | "," )
private static final long L_USERINFO
= L_UNRESERVED | L_ESCAPED | 0x2C00185000000000L; // lowMask(";:&=+$,");
private static final long H_USERINFO
= H_UNRESERVED | H_ESCAPED; // | highMask(";:&=+$,") == 0L;
// reg_name = 1*( unreserved | escaped | "$" | "," |
// ";" | ":" | "@" | "&" | "=" | "+" )
private static final long L_REG_NAME
= L_UNRESERVED | L_ESCAPED | 0x2C00185000000000L; // lowMask("$,;:@&=+");
private static final long H_REG_NAME
= H_UNRESERVED | H_ESCAPED | 0x1L; // highMask("$,;:@&=+");
// All valid characters for server-based authorities
private static final long L_SERVER
= L_USERINFO | L_ALPHANUM | L_DASH | 0x400400000000000L; // lowMask(".:@[]");
private static final long H_SERVER
= H_USERINFO | H_ALPHANUM | H_DASH | 0x28000001L; // highMask(".:@[]");
// Characters that are encoded in the path component of a URI.
//
// These characters are reserved in the path segment as described in
// RFC2396 section 3.3:
// "=" | ";" | "?" | "/"
//
// These characters are defined as excluded in RFC2396 section 2.4.3
// and must be escaped if they occur in the data part of a URI:
// "#" | " " | "<" | ">" | "%" | "\"" | "{" | "}" | "|" | "\\" | "^" |
// "[" | "]" | "`"
//
// Also US ASCII control characters 00-1F and 7F.
// lowMask((char)0, (char)31) | lowMask("=;?/# <>%\"{}|\\^[]`");
private static final long L_ENCODED = 0xF800802DFFFFFFFFL;
// highMask((char)0x7F, (char)0x7F) | highMask("=;?/# <>%\"{}|\\^[]`");
private static final long H_ENCODED = 0xB800000178000000L;
}
⏎ sun/net/www/ParseUtil.java
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