org.eclipse.jgit/src/org/eclipse/jgit/util/QuotedString.java - jgit - Git at Google

 /*
  * Copyright (C) 2008, 2019 Google Inc. and others
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Distribution License v. 1.0 which is available at
  * https://www.eclipse.org/org/documents/edl-v10.php.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */

 package org.eclipse.jgit.util;

 import static java.nio.charset.StandardCharsets.UTF_8;

 import java.util.Arrays;

 import org.eclipse.jgit.lib.Constants;

 /**
  * Utility functions related to quoted string handling.
  */
 public abstract class QuotedString {
 	/** Quoting style that obeys the rules Git applies to file names */
 	public static final GitPathStyle GIT_PATH = new GitPathStyle(true);

 	/**
 	 * Quoting style that obeys the rules Git applies to file names when
 	 * {@code core.quotePath = false}.
 	 *
 	 * @since 5.6
 	 */
 	public static final QuotedString GIT_PATH_MINIMAL = new GitPathStyle(false);

 	/**
 	 * Quoting style used by the Bourne shell.
 	 * <p>
 	 * Quotes are unconditionally inserted during {@link #quote(String)}. This
 	 * protects shell meta-characters like <code>$</code> or <code>~</code> from
 	 * being recognized as special.
 	 */
 	public static final BourneStyle BOURNE = new BourneStyle();

 	/** Bourne style, but permits <code>~user</code> at the start of the string. */
 	public static final BourneUserPathStyle BOURNE_USER_PATH = new BourneUserPathStyle();

 	/**
 	 * Quote an input string by the quoting rules.
 	 * <p>
 	 * If the input string does not require any quoting, the same String
 	 * reference is returned to the caller.
 	 * <p>
 	 * Otherwise a quoted string is returned, including the opening and closing
 	 * quotation marks at the start and end of the string. If the style does not
 	 * permit raw Unicode characters then the string will first be encoded in
 	 * UTF-8, with unprintable sequences possibly escaped by the rules.
 	 *
 	 * @param in
 	 *            any non-null Unicode string.
 	 * @return a quoted string. See above for details.
 	 */
 	public abstract String quote(String in);

 	/**
 	 * Clean a previously quoted input, decoding the result via UTF-8.
 	 * <p>
 	 * This method must match quote such that:
 	 *
 	 * <pre>
 	 * a.equals(dequote(quote(a)));
 	 * </pre>
 	 *
 	 * is true for any <code>a</code>.
 	 *
 	 * @param in
 	 *            a Unicode string to remove quoting from.
 	 * @return the cleaned string.
 	 * @see #dequote(byte[], int, int)
 	 */
 	public String dequote(String in) {
 		final byte[] b = Constants.encode(in);
 		return dequote(b, 0, b.length);
 	}

 	/**
 	 * Decode a previously quoted input, scanning a UTF-8 encoded buffer.
 	 * <p>
 	 * This method must match quote such that:
 	 *
 	 * <pre>
 	 * a.equals(dequote(Constants.encode(quote(a))));
 	 * </pre>
 	 *
 	 * is true for any <code>a</code>.
 	 * <p>
 	 * This method removes any opening/closing quotation marks added by
 	 * {@link #quote(String)}.
 	 *
 	 * @param in
 	 *            the input buffer to parse.
 	 * @param offset
 	 *            first position within <code>in</code> to scan.
 	 * @param end
 	 *            one position past in <code>in</code> to scan.
 	 * @return the cleaned string.
 	 */
 	public abstract String dequote(byte[] in, int offset, int end);

 	/**
 	 * Quoting style used by the Bourne shell.
 	 * <p>
 	 * Quotes are unconditionally inserted during {@link #quote(String)}. This
 	 * protects shell meta-characters like <code>$</code> or <code>~</code> from
 	 * being recognized as special.
 	 */
 	public static class BourneStyle extends QuotedString {
 		@Override
 		public String quote(String in) {
 			final StringBuilder r = new StringBuilder();
 			r.append('\'');
 			int start = 0, i = 0;
 			for (; i < in.length(); i++) {
 				switch (in.charAt(i)) {
 				case '\'':
 				case '!':
 					r.append(in, start, i);
 					r.append('\'');
 					r.append('\\');
 					r.append(in.charAt(i));
 					r.append('\'');
 					start = i + 1;
 					break;
 				}
 			}
 			r.append(in, start, i);
 			r.append('\'');
 			return r.toString();
 		}

 		@Override
 		public String dequote(byte[] in, int ip, int ie) {
 			boolean inquote = false;
 			final byte[] r = new byte[ie - ip];
 			int rPtr = 0;
 			while (ip < ie) {
 				final byte b = in[ip++];
 				switch (b) {
 				case '\'':
 					inquote = !inquote;
 					continue;
 				case '\\':
 					if (inquote || ip == ie)
 						r[rPtr++] = b; // literal within a quote
 					else
 						r[rPtr++] = in[ip++];
 					continue;
 				default:
 					r[rPtr++] = b;
 					continue;
 				}
 			}
 			return RawParseUtils.decode(UTF_8, r, 0, rPtr);
 		}
 	}

 	/** Bourne style, but permits <code>~user</code> at the start of the string. */
 	public static class BourneUserPathStyle extends BourneStyle {
 		@Override
 		public String quote(String in) {
 			if (in.matches("^~[A-Za-z0-9_-]+$")) { //$NON-NLS-1$
 				// If the string is just "~user" we can assume they
 				// mean "~user/".
 				//
 				return in + "/"; //$NON-NLS-1$
 			}

 			if (in.matches("^~[A-Za-z0-9_-]*/.*$")) { //$NON-NLS-1$
 				// If the string is of "~/path" or "~user/path"
 				// we must not escape ~/ or ~user/ from the shell.
 				//
 				final int i = in.indexOf('/') + 1;
 				if (i == in.length())
 					return in;
 				return in.substring(0, i) + super.quote(in.substring(i));
 			}

 			return super.quote(in);
 		}
 	}

 	/** Quoting style that obeys the rules Git applies to file names */
 	public static final class GitPathStyle extends QuotedString {
 		private static final byte[] quote;
 		static {
 			quote = new byte[128];
 			Arrays.fill(quote, (byte) -1);

 			for (int i = '0'; i <= '9'; i++)
 				quote[i] = 0;
 			for (int i = 'a'; i <= 'z'; i++)
 				quote[i] = 0;
 			for (int i = 'A'; i <= 'Z'; i++)
 				quote[i] = 0;
 			quote[' '] = 0;
 			quote['$'] = 0;
 			quote['%'] = 0;
 			quote['&'] = 0;
 			quote['*'] = 0;
 			quote['+'] = 0;
 			quote[','] = 0;
 			quote['-'] = 0;
 			quote['.'] = 0;
 			quote['/'] = 0;
 			quote[':'] = 0;
 			quote[';'] = 0;
 			quote['='] = 0;
 			quote['?'] = 0;
 			quote['@'] = 0;
 			quote['_'] = 0;
 			quote['^'] = 0;
 			quote['|'] = 0;
 			quote['~'] = 0;

 			quote['\u0007'] = 'a';
 			quote['\b'] = 'b';
 			quote['\f'] = 'f';
 			quote['\n'] = 'n';
 			quote['\r'] = 'r';
 			quote['\t'] = 't';
 			quote['\u000B'] = 'v';
 			quote['\\'] = '\\';
 			quote['"'] = '"';
 		}

 		private final boolean quoteHigh;

 		@Override
 		public String quote(String instr) {
 			if (instr.isEmpty()) {
 				return "\"\""; //$NON-NLS-1$
 			}
 			boolean reuse = true;
 			final byte[] in = Constants.encode(instr);
 			final byte[] out = new byte[4 * in.length + 2];
 			int o = 0;
 			out[o++] = '"';
 			for (int i = 0; i < in.length; i++) {
 				final int c = in[i] & 0xff;
 				if (c < quote.length) {
 					final byte style = quote[c];
 					if (style == 0) {
 						out[o++] = (byte) c;
 						continue;
 					}
 					if (style > 0) {
 						reuse = false;
 						out[o++] = '\\';
 						out[o++] = style;
 						continue;
 					}
 				} else if (!quoteHigh) {
 					out[o++] = (byte) c;
 					continue;
 				}

 				reuse = false;
 				out[o++] = '\\';
 				out[o++] = (byte) (((c >> 6) & 03) + '0');
 				out[o++] = (byte) (((c >> 3) & 07) + '0');
 				out[o++] = (byte) (((c >> 0) & 07) + '0');
 			}
 			if (reuse) {
 				return instr;
 			}
 			out[o++] = '"';
 			return new String(out, 0, o, UTF_8);
 		}

 		@Override
 		public String dequote(byte[] in, int inPtr, int inEnd) {
 			if (2 <= inEnd - inPtr && in[inPtr] == '"' && in[inEnd - 1] == '"')
 				return dq(in, inPtr + 1, inEnd - 1);
 			return RawParseUtils.decode(UTF_8, in, inPtr, inEnd);
 		}

 		private static String dq(byte[] in, int inPtr, int inEnd) {
 			final byte[] r = new byte[inEnd - inPtr];
 			int rPtr = 0;
 			while (inPtr < inEnd) {
 				final byte b = in[inPtr++];
 				if (b != '\\') {
 					r[rPtr++] = b;
 					continue;
 				}

 				if (inPtr == inEnd) {
 					// Lone trailing backslash. Treat it as a literal.
 					//
 					r[rPtr++] = '\\';
 					break;
 				}

 				switch (in[inPtr++]) {
 				case 'a':
 					r[rPtr++] = 0x07 /* \a = BEL */;
 					continue;
 				case 'b':
 					r[rPtr++] = '\b';
 					continue;
 				case 'f':
 					r[rPtr++] = '\f';
 					continue;
 				case 'n':
 					r[rPtr++] = '\n';
 					continue;
 				case 'r':
 					r[rPtr++] = '\r';
 					continue;
 				case 't':
 					r[rPtr++] = '\t';
 					continue;
 				case 'v':
 					r[rPtr++] = 0x0B/* \v = VT */;
 					continue;

 				case '\\':
 				case '"':
 					r[rPtr++] = in[inPtr - 1];
 					continue;

 				case '0':
 				case '1':
 				case '2':
 				case '3': {
 					int cp = in[inPtr - 1] - '0';
 					for (int n = 1; n < 3 && inPtr < inEnd; n++) {
 						final byte c = in[inPtr];
 						if ('0' <= c && c <= '7') {
 							cp <<= 3;
 							cp |= c - '0';
 							inPtr++;
 						} else {
 							break;
 						}
 					}
 					r[rPtr++] = (byte) cp;
 					continue;
 				}

 				default:
 					// Any other code is taken literally.
 					//
 					r[rPtr++] = '\\';
 					r[rPtr++] = in[inPtr - 1];
 					continue;
 				}
 			}

 			return RawParseUtils.decode(UTF_8, r, 0, rPtr);
 		}

 		private GitPathStyle(boolean doQuote) {
 			quoteHigh = doQuote;
 		}
 	}
 }
	/*
	* Copyright (C) 2008, 2019 Google Inc. and others
	*
	* This program and the accompanying materials are made available under the
	* terms of the Eclipse Distribution License v. 1.0 which is available at
	* https://www.eclipse.org/org/documents/edl-v10.php.
	*
	* SPDX-License-Identifier: BSD-3-Clause
	*/

	package org.eclipse.jgit.util;

	import static java.nio.charset.StandardCharsets.UTF_8;

	import java.util.Arrays;

	import org.eclipse.jgit.lib.Constants;

	/**
	* Utility functions related to quoted string handling.
	*/
	public abstract class QuotedString {
	/** Quoting style that obeys the rules Git applies to file names */
	public static final GitPathStyle GIT_PATH = new GitPathStyle(true);

	/**
	* Quoting style that obeys the rules Git applies to file names when
	* {@code core.quotePath = false}.
	*
	* @since 5.6
	*/
	public static final QuotedString GIT_PATH_MINIMAL = new GitPathStyle(false);

	/**
	* Quoting style used by the Bourne shell.
	* <p>
	* Quotes are unconditionally inserted during {@link #quote(String)}. This
	* protects shell meta-characters like <code>$</code> or <code>~</code> from
	* being recognized as special.
	*/
	public static final BourneStyle BOURNE = new BourneStyle();

	/** Bourne style, but permits <code>~user</code> at the start of the string. */
	public static final BourneUserPathStyle BOURNE_USER_PATH = new BourneUserPathStyle();

	/**
	* Quote an input string by the quoting rules.
	* <p>
	* If the input string does not require any quoting, the same String
	* reference is returned to the caller.
	* <p>
	* Otherwise a quoted string is returned, including the opening and closing
	* quotation marks at the start and end of the string. If the style does not
	* permit raw Unicode characters then the string will first be encoded in
	* UTF-8, with unprintable sequences possibly escaped by the rules.
	*
	* @param in
	* any non-null Unicode string.
	* @return a quoted string. See above for details.
	*/
	public abstract String quote(String in);

	/**
	* Clean a previously quoted input, decoding the result via UTF-8.
	* <p>
	* This method must match quote such that:
	*
	* <pre>
	* a.equals(dequote(quote(a)));
	* </pre>
	*
	* is true for any <code>a</code>.
	*
	* @param in
	* a Unicode string to remove quoting from.
	* @return the cleaned string.
	* @see #dequote(byte[], int, int)
	*/
	public String dequote(String in) {
	final byte[] b = Constants.encode(in);
	return dequote(b, 0, b.length);
	}

	/**
	* Decode a previously quoted input, scanning a UTF-8 encoded buffer.
	* <p>
	* This method must match quote such that:
	*
	* <pre>
	* a.equals(dequote(Constants.encode(quote(a))));
	* </pre>
	*
	* is true for any <code>a</code>.
	* <p>
	* This method removes any opening/closing quotation marks added by
	* {@link #quote(String)}.
	*
	* @param in
	* the input buffer to parse.
	* @param offset
	* first position within <code>in</code> to scan.
	* @param end
	* one position past in <code>in</code> to scan.
	* @return the cleaned string.
	*/
	public abstract String dequote(byte[] in, int offset, int end);

	/**
	* Quoting style used by the Bourne shell.
	* <p>
	* Quotes are unconditionally inserted during {@link #quote(String)}. This
	* protects shell meta-characters like <code>$</code> or <code>~</code> from
	* being recognized as special.
	*/
	public static class BourneStyle extends QuotedString {
	@Override
	public String quote(String in) {
	final StringBuilder r = new StringBuilder();
	r.append('\'');
	int start = 0, i = 0;
	for (; i < in.length(); i++) {
	switch (in.charAt(i)) {
	case '\'':
	case '!':
	r.append(in, start, i);
	r.append('\'');
	r.append('\\');
	r.append(in.charAt(i));
	r.append('\'');
	start = i + 1;
	break;
	}
	}
	r.append(in, start, i);
	r.append('\'');
	return r.toString();
	}

	@Override
	public String dequote(byte[] in, int ip, int ie) {
	boolean inquote = false;
	final byte[] r = new byte[ie - ip];
	int rPtr = 0;
	while (ip < ie) {
	final byte b = in[ip++];
	switch (b) {
	case '\'':
	inquote = !inquote;
	continue;
	case '\\':
	if (inquote \|\| ip == ie)
	r[rPtr++] = b; // literal within a quote
	else
	r[rPtr++] = in[ip++];
	continue;
	default:
	r[rPtr++] = b;
	continue;
	}
	}
	return RawParseUtils.decode(UTF_8, r, 0, rPtr);
	}
	}

	/** Bourne style, but permits <code>~user</code> at the start of the string. */
	public static class BourneUserPathStyle extends BourneStyle {
	@Override
	public String quote(String in) {
	if (in.matches("^~[A-Za-z0-9_-]+$")) { //$NON-NLS-1$
	// If the string is just "~user" we can assume they
	// mean "~user/".
	//
	return in + "/"; //$NON-NLS-1$
	}

	if (in.matches("^~[A-Za-z0-9_-]/.$")) { //$NON-NLS-1$
	// If the string is of "~/path" or "~user/path"
	// we must not escape ~/ or ~user/ from the shell.
	//
	final int i = in.indexOf('/') + 1;
	if (i == in.length())
	return in;
	return in.substring(0, i) + super.quote(in.substring(i));
	}

	return super.quote(in);
	}
	}

	/** Quoting style that obeys the rules Git applies to file names */
	public static final class GitPathStyle extends QuotedString {
	private static final byte[] quote;
	static {
	quote = new byte[128];
	Arrays.fill(quote, (byte) -1);

	for (int i = '0'; i <= '9'; i++)
	quote[i] = 0;
	for (int i = 'a'; i <= 'z'; i++)
	quote[i] = 0;
	for (int i = 'A'; i <= 'Z'; i++)
	quote[i] = 0;
	quote[' '] = 0;
	quote['$'] = 0;
	quote['%'] = 0;
	quote['&'] = 0;
	quote['*'] = 0;
	quote['+'] = 0;
	quote[','] = 0;
	quote['-'] = 0;
	quote['.'] = 0;
	quote['/'] = 0;
	quote[':'] = 0;
	quote[';'] = 0;
	quote['='] = 0;
	quote['?'] = 0;
	quote['@'] = 0;
	quote['_'] = 0;
	quote['^'] = 0;
	quote['\|'] = 0;
	quote['~'] = 0;

	quote['\u0007'] = 'a';
	quote['\b'] = 'b';
	quote['\f'] = 'f';
	quote['\n'] = 'n';
	quote['\r'] = 'r';
	quote['\t'] = 't';
	quote['\u000B'] = 'v';
	quote['\\'] = '\\';
	quote['"'] = '"';
	}

	private final boolean quoteHigh;

	@Override
	public String quote(String instr) {
	if (instr.isEmpty()) {
	return "\"\""; //$NON-NLS-1$
	}
	boolean reuse = true;
	final byte[] in = Constants.encode(instr);
	final byte[] out = new byte[4 * in.length + 2];
	int o = 0;
	out[o++] = '"';
	for (int i = 0; i < in.length; i++) {
	final int c = in[i] & 0xff;
	if (c < quote.length) {
	final byte style = quote[c];
	if (style == 0) {
	out[o++] = (byte) c;
	continue;
	}
	if (style > 0) {
	reuse = false;
	out[o++] = '\\';
	out[o++] = style;
	continue;
	}
	} else if (!quoteHigh) {
	out[o++] = (byte) c;
	continue;
	}

	reuse = false;
	out[o++] = '\\';
	out[o++] = (byte) (((c >> 6) & 03) + '0');
	out[o++] = (byte) (((c >> 3) & 07) + '0');
	out[o++] = (byte) (((c >> 0) & 07) + '0');
	}
	if (reuse) {
	return instr;
	}
	out[o++] = '"';
	return new String(out, 0, o, UTF_8);
	}

	@Override
	public String dequote(byte[] in, int inPtr, int inEnd) {
	if (2 <= inEnd - inPtr && in[inPtr] == '"' && in[inEnd - 1] == '"')
	return dq(in, inPtr + 1, inEnd - 1);
	return RawParseUtils.decode(UTF_8, in, inPtr, inEnd);
	}

	private static String dq(byte[] in, int inPtr, int inEnd) {
	final byte[] r = new byte[inEnd - inPtr];
	int rPtr = 0;
	while (inPtr < inEnd) {
	final byte b = in[inPtr++];
	if (b != '\\') {
	r[rPtr++] = b;
	continue;
	}

	if (inPtr == inEnd) {
	// Lone trailing backslash. Treat it as a literal.
	//
	r[rPtr++] = '\\';
	break;
	}

	switch (in[inPtr++]) {
	case 'a':
	r[rPtr++] = 0x07 /* \a = BEL */;
	continue;
	case 'b':
	r[rPtr++] = '\b';
	continue;
	case 'f':
	r[rPtr++] = '\f';
	continue;
	case 'n':
	r[rPtr++] = '\n';
	continue;
	case 'r':
	r[rPtr++] = '\r';
	continue;
	case 't':
	r[rPtr++] = '\t';
	continue;
	case 'v':
	r[rPtr++] = 0x0B/* \v = VT */;
	continue;

	case '\\':
	case '"':
	r[rPtr++] = in[inPtr - 1];
	continue;

	case '0':
	case '1':
	case '2':
	case '3': {
	int cp = in[inPtr - 1] - '0';
	for (int n = 1; n < 3 && inPtr < inEnd; n++) {
	final byte c = in[inPtr];
	if ('0' <= c && c <= '7') {
	cp <<= 3;
	cp \|= c - '0';
	inPtr++;
	} else {
	break;
	}
	}
	r[rPtr++] = (byte) cp;
	continue;
	}

	default:
	// Any other code is taken literally.
	//
	r[rPtr++] = '\\';
	r[rPtr++] = in[inPtr - 1];
	continue;
	}
	}

	return RawParseUtils.decode(UTF_8, r, 0, rPtr);
	}

	private GitPathStyle(boolean doQuote) {
	quoteHigh = doQuote;
	}
	}
	}