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- /*
- * Copyright (C) 2008-2009, Google Inc.
- * Copyright (C) 2006-2008, Shawn O. Pearce <spearce@spearce.org>
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- package org.eclipse.jgit.util;
-
- import static org.eclipse.jgit.lib.ObjectChecker.author;
- import static org.eclipse.jgit.lib.ObjectChecker.committer;
- import static org.eclipse.jgit.lib.ObjectChecker.encoding;
- import static org.eclipse.jgit.lib.ObjectChecker.tagger;
-
- import java.nio.ByteBuffer;
- import java.nio.charset.CharacterCodingException;
- import java.nio.charset.Charset;
- import java.nio.charset.CharsetDecoder;
- import java.nio.charset.CodingErrorAction;
- import java.util.Arrays;
-
- import org.eclipse.jgit.lib.Constants;
- import org.eclipse.jgit.lib.PersonIdent;
-
- /** Handy utility functions to parse raw object contents. */
- public final class RawParseUtils {
- private static final byte[] digits10;
-
- private static final byte[] digits16;
-
- private static final byte[] footerLineKeyChars;
-
- static {
- digits10 = new byte['9' + 1];
- Arrays.fill(digits10, (byte) -1);
- for (char i = '0'; i <= '9'; i++)
- digits10[i] = (byte) (i - '0');
-
- digits16 = new byte['f' + 1];
- Arrays.fill(digits16, (byte) -1);
- for (char i = '0'; i <= '9'; i++)
- digits16[i] = (byte) (i - '0');
- for (char i = 'a'; i <= 'f'; i++)
- digits16[i] = (byte) ((i - 'a') + 10);
- for (char i = 'A'; i <= 'F'; i++)
- digits16[i] = (byte) ((i - 'A') + 10);
-
- footerLineKeyChars = new byte['z' + 1];
- footerLineKeyChars['-'] = 1;
- for (char i = '0'; i <= '9'; i++)
- footerLineKeyChars[i] = 1;
- for (char i = 'A'; i <= 'Z'; i++)
- footerLineKeyChars[i] = 1;
- for (char i = 'a'; i <= 'z'; i++)
- footerLineKeyChars[i] = 1;
- }
-
- /**
- * Determine if b[ptr] matches src.
- *
- * @param b
- * the buffer to scan.
- * @param ptr
- * first position within b, this should match src[0].
- * @param src
- * the buffer to test for equality with b.
- * @return ptr + src.length if b[ptr..src.length] == src; else -1.
- */
- public static final int match(final byte[] b, int ptr, final byte[] src) {
- if (ptr + src.length > b.length)
- return -1;
- for (int i = 0; i < src.length; i++, ptr++)
- if (b[ptr] != src[i])
- return -1;
- return ptr;
- }
-
- private static final byte[] base10byte = { '0', '1', '2', '3', '4', '5',
- '6', '7', '8', '9' };
-
- /**
- * Format a base 10 numeric into a temporary buffer.
- * <p>
- * Formatting is performed backwards. The method starts at offset
- * <code>o-1</code> and ends at <code>o-1-digits</code>, where
- * <code>digits</code> is the number of positions necessary to store the
- * base 10 value.
- * <p>
- * The argument and return values from this method make it easy to chain
- * writing, for example:
- * </p>
- *
- * <pre>
- * final byte[] tmp = new byte[64];
- * int ptr = tmp.length;
- * tmp[--ptr] = '\n';
- * ptr = RawParseUtils.formatBase10(tmp, ptr, 32);
- * tmp[--ptr] = ' ';
- * ptr = RawParseUtils.formatBase10(tmp, ptr, 18);
- * tmp[--ptr] = 0;
- * final String str = new String(tmp, ptr, tmp.length - ptr);
- * </pre>
- *
- * @param b
- * buffer to write into.
- * @param o
- * one offset past the location where writing will begin; writing
- * proceeds towards lower index values.
- * @param value
- * the value to store.
- * @return the new offset value <code>o</code>. This is the position of
- * the last byte written. Additional writing should start at one
- * position earlier.
- */
- public static int formatBase10(final byte[] b, int o, int value) {
- if (value == 0) {
- b[--o] = '0';
- return o;
- }
- final boolean isneg = value < 0;
- while (value != 0) {
- b[--o] = base10byte[value % 10];
- value /= 10;
- }
- if (isneg)
- b[--o] = '-';
- return o;
- }
-
- /**
- * Parse a base 10 numeric from a sequence of ASCII digits into an int.
- * <p>
- * Digit sequences can begin with an optional run of spaces before the
- * sequence, and may start with a '+' or a '-' to indicate sign position.
- * Any other characters will cause the method to stop and return the current
- * result to the caller.
- *
- * @param b
- * buffer to scan.
- * @param ptr
- * position within buffer to start parsing digits at.
- * @param ptrResult
- * optional location to return the new ptr value through. If null
- * the ptr value will be discarded.
- * @return the value at this location; 0 if the location is not a valid
- * numeric.
- */
- public static final int parseBase10(final byte[] b, int ptr,
- final MutableInteger ptrResult) {
- int r = 0;
- int sign = 0;
- try {
- final int sz = b.length;
- while (ptr < sz && b[ptr] == ' ')
- ptr++;
- if (ptr >= sz)
- return 0;
-
- switch (b[ptr]) {
- case '-':
- sign = -1;
- ptr++;
- break;
- case '+':
- ptr++;
- break;
- }
-
- while (ptr < sz) {
- final byte v = digits10[b[ptr]];
- if (v < 0)
- break;
- r = (r * 10) + v;
- ptr++;
- }
- } catch (ArrayIndexOutOfBoundsException e) {
- // Not a valid digit.
- }
- if (ptrResult != null)
- ptrResult.value = ptr;
- return sign < 0 ? -r : r;
- }
-
- /**
- * Parse a base 10 numeric from a sequence of ASCII digits into a long.
- * <p>
- * Digit sequences can begin with an optional run of spaces before the
- * sequence, and may start with a '+' or a '-' to indicate sign position.
- * Any other characters will cause the method to stop and return the current
- * result to the caller.
- *
- * @param b
- * buffer to scan.
- * @param ptr
- * position within buffer to start parsing digits at.
- * @param ptrResult
- * optional location to return the new ptr value through. If null
- * the ptr value will be discarded.
- * @return the value at this location; 0 if the location is not a valid
- * numeric.
- */
- public static final long parseLongBase10(final byte[] b, int ptr,
- final MutableInteger ptrResult) {
- long r = 0;
- int sign = 0;
- try {
- final int sz = b.length;
- while (ptr < sz && b[ptr] == ' ')
- ptr++;
- if (ptr >= sz)
- return 0;
-
- switch (b[ptr]) {
- case '-':
- sign = -1;
- ptr++;
- break;
- case '+':
- ptr++;
- break;
- }
-
- while (ptr < sz) {
- final byte v = digits10[b[ptr]];
- if (v < 0)
- break;
- r = (r * 10) + v;
- ptr++;
- }
- } catch (ArrayIndexOutOfBoundsException e) {
- // Not a valid digit.
- }
- if (ptrResult != null)
- ptrResult.value = ptr;
- return sign < 0 ? -r : r;
- }
-
- /**
- * Parse 4 character base 16 (hex) formatted string to unsigned integer.
- * <p>
- * The number is read in network byte order, that is, most significant
- * nybble first.
- *
- * @param bs
- * buffer to parse digits from; positions {@code [p, p+4)} will
- * be parsed.
- * @param p
- * first position within the buffer to parse.
- * @return the integer value.
- * @throws ArrayIndexOutOfBoundsException
- * if the string is not hex formatted.
- */
- public static final int parseHexInt16(final byte[] bs, final int p) {
- int r = digits16[bs[p]] << 4;
-
- r |= digits16[bs[p + 1]];
- r <<= 4;
-
- r |= digits16[bs[p + 2]];
- r <<= 4;
-
- r |= digits16[bs[p + 3]];
- if (r < 0)
- throw new ArrayIndexOutOfBoundsException();
- return r;
- }
-
- /**
- * Parse 8 character base 16 (hex) formatted string to unsigned integer.
- * <p>
- * The number is read in network byte order, that is, most significant
- * nybble first.
- *
- * @param bs
- * buffer to parse digits from; positions {@code [p, p+8)} will
- * be parsed.
- * @param p
- * first position within the buffer to parse.
- * @return the integer value.
- * @throws ArrayIndexOutOfBoundsException
- * if the string is not hex formatted.
- */
- public static final int parseHexInt32(final byte[] bs, final int p) {
- int r = digits16[bs[p]] << 4;
-
- r |= digits16[bs[p + 1]];
- r <<= 4;
-
- r |= digits16[bs[p + 2]];
- r <<= 4;
-
- r |= digits16[bs[p + 3]];
- r <<= 4;
-
- r |= digits16[bs[p + 4]];
- r <<= 4;
-
- r |= digits16[bs[p + 5]];
- r <<= 4;
-
- r |= digits16[bs[p + 6]];
-
- final int last = digits16[bs[p + 7]];
- if (r < 0 || last < 0)
- throw new ArrayIndexOutOfBoundsException();
- return (r << 4) | last;
- }
-
- /**
- * Parse a single hex digit to its numeric value (0-15).
- *
- * @param digit
- * hex character to parse.
- * @return numeric value, in the range 0-15.
- * @throws ArrayIndexOutOfBoundsException
- * if the input digit is not a valid hex digit.
- */
- public static final int parseHexInt4(final byte digit) {
- final byte r = digits16[digit];
- if (r < 0)
- throw new ArrayIndexOutOfBoundsException();
- return r;
- }
-
- /**
- * Parse a Git style timezone string.
- * <p>
- * The sequence "-0315" will be parsed as the numeric value -195, as the
- * lower two positions count minutes, not 100ths of an hour.
- *
- * @param b
- * buffer to scan.
- * @param ptr
- * position within buffer to start parsing digits at.
- * @return the timezone at this location, expressed in minutes.
- */
- public static final int parseTimeZoneOffset(final byte[] b, int ptr) {
- final int v = parseBase10(b, ptr, null);
- final int tzMins = v % 100;
- final int tzHours = v / 100;
- return tzHours * 60 + tzMins;
- }
-
- /**
- * Locate the first position after a given character.
- *
- * @param b
- * buffer to scan.
- * @param ptr
- * position within buffer to start looking for chrA at.
- * @param chrA
- * character to find.
- * @return new position just after chrA.
- */
- public static final int next(final byte[] b, int ptr, final char chrA) {
- final int sz = b.length;
- while (ptr < sz) {
- if (b[ptr++] == chrA)
- return ptr;
- }
- return ptr;
- }
-
- /**
- * Locate the first position after the next LF.
- * <p>
- * This method stops on the first '\n' it finds.
- *
- * @param b
- * buffer to scan.
- * @param ptr
- * position within buffer to start looking for LF at.
- * @return new position just after the first LF found.
- */
- public static final int nextLF(final byte[] b, int ptr) {
- return next(b, ptr, '\n');
- }
-
- /**
- * Locate the first position after either the given character or LF.
- * <p>
- * This method stops on the first match it finds from either chrA or '\n'.
- *
- * @param b
- * buffer to scan.
- * @param ptr
- * position within buffer to start looking for chrA or LF at.
- * @param chrA
- * character to find.
- * @return new position just after the first chrA or LF to be found.
- */
- public static final int nextLF(final byte[] b, int ptr, final char chrA) {
- final int sz = b.length;
- while (ptr < sz) {
- final byte c = b[ptr++];
- if (c == chrA || c == '\n')
- return ptr;
- }
- return ptr;
- }
-
- /**
- * Locate the first position before a given character.
- *
- * @param b
- * buffer to scan.
- * @param ptr
- * position within buffer to start looking for chrA at.
- * @param chrA
- * character to find.
- * @return new position just before chrA, -1 for not found
- */
- public static final int prev(final byte[] b, int ptr, final char chrA) {
- if (ptr == b.length)
- --ptr;
- while (ptr >= 0) {
- if (b[ptr--] == chrA)
- return ptr;
- }
- return ptr;
- }
-
- /**
- * Locate the first position before the previous LF.
- * <p>
- * This method stops on the first '\n' it finds.
- *
- * @param b
- * buffer to scan.
- * @param ptr
- * position within buffer to start looking for LF at.
- * @return new position just before the first LF found, -1 for not found
- */
- public static final int prevLF(final byte[] b, int ptr) {
- return prev(b, ptr, '\n');
- }
-
- /**
- * Locate the previous position before either the given character or LF.
- * <p>
- * This method stops on the first match it finds from either chrA or '\n'.
- *
- * @param b
- * buffer to scan.
- * @param ptr
- * position within buffer to start looking for chrA or LF at.
- * @param chrA
- * character to find.
- * @return new position just before the first chrA or LF to be found, -1 for
- * not found
- */
- public static final int prevLF(final byte[] b, int ptr, final char chrA) {
- if (ptr == b.length)
- --ptr;
- while (ptr >= 0) {
- final byte c = b[ptr--];
- if (c == chrA || c == '\n')
- return ptr;
- }
- return ptr;
- }
-
- /**
- * Index the region between <code>[ptr, end)</code> to find line starts.
- * <p>
- * The returned list is 1 indexed. Index 0 contains
- * {@link Integer#MIN_VALUE} to pad the list out.
- * <p>
- * Using a 1 indexed list means that line numbers can be directly accessed
- * from the list, so <code>list.get(1)</code> (aka get line 1) returns
- * <code>ptr</code>.
- * <p>
- * The last element (index <code>map.size()-1</code>) always contains
- * <code>end</code>.
- *
- * @param buf
- * buffer to scan.
- * @param ptr
- * position within the buffer corresponding to the first byte of
- * line 1.
- * @param end
- * 1 past the end of the content within <code>buf</code>.
- * @return a line map indexing the start position of each line.
- */
- public static final IntList lineMap(final byte[] buf, int ptr, int end) {
- // Experimentally derived from multiple source repositories
- // the average number of bytes/line is 36. Its a rough guess
- // to initially size our map close to the target.
- //
- final IntList map = new IntList((end - ptr) / 36);
- map.fillTo(1, Integer.MIN_VALUE);
- for (; ptr < end; ptr = nextLF(buf, ptr))
- map.add(ptr);
- map.add(end);
- return map;
- }
-
- /**
- * Locate the "author " header line data.
- *
- * @param b
- * buffer to scan.
- * @param ptr
- * position in buffer to start the scan at. Most callers should
- * pass 0 to ensure the scan starts from the beginning of the
- * commit buffer and does not accidentally look at message body.
- * @return position just after the space in "author ", so the first
- * character of the author's name. If no author header can be
- * located -1 is returned.
- */
- public static final int author(final byte[] b, int ptr) {
- final int sz = b.length;
- if (ptr == 0)
- ptr += 46; // skip the "tree ..." line.
- while (ptr < sz && b[ptr] == 'p')
- ptr += 48; // skip this parent.
- return match(b, ptr, author);
- }
-
- /**
- * Locate the "committer " header line data.
- *
- * @param b
- * buffer to scan.
- * @param ptr
- * position in buffer to start the scan at. Most callers should
- * pass 0 to ensure the scan starts from the beginning of the
- * commit buffer and does not accidentally look at message body.
- * @return position just after the space in "committer ", so the first
- * character of the committer's name. If no committer header can be
- * located -1 is returned.
- */
- public static final int committer(final byte[] b, int ptr) {
- final int sz = b.length;
- if (ptr == 0)
- ptr += 46; // skip the "tree ..." line.
- while (ptr < sz && b[ptr] == 'p')
- ptr += 48; // skip this parent.
- if (ptr < sz && b[ptr] == 'a')
- ptr = nextLF(b, ptr);
- return match(b, ptr, committer);
- }
-
- /**
- * Locate the "tagger " header line data.
- *
- * @param b
- * buffer to scan.
- * @param ptr
- * position in buffer to start the scan at. Most callers should
- * pass 0 to ensure the scan starts from the beginning of the tag
- * buffer and does not accidentally look at message body.
- * @return position just after the space in "tagger ", so the first
- * character of the tagger's name. If no tagger header can be
- * located -1 is returned.
- */
- public static final int tagger(final byte[] b, int ptr) {
- final int sz = b.length;
- if (ptr == 0)
- ptr += 48; // skip the "object ..." line.
- while (ptr < sz) {
- if (b[ptr] == '\n')
- return -1;
- final int m = match(b, ptr, tagger);
- if (m >= 0)
- return m;
- ptr = nextLF(b, ptr);
- }
- return -1;
- }
-
- /**
- * Locate the "encoding " header line.
- *
- * @param b
- * buffer to scan.
- * @param ptr
- * position in buffer to start the scan at. Most callers should
- * pass 0 to ensure the scan starts from the beginning of the
- * buffer and does not accidentally look at the message body.
- * @return position just after the space in "encoding ", so the first
- * character of the encoding's name. If no encoding header can be
- * located -1 is returned (and UTF-8 should be assumed).
- */
- public static final int encoding(final byte[] b, int ptr) {
- final int sz = b.length;
- while (ptr < sz) {
- if (b[ptr] == '\n')
- return -1;
- if (b[ptr] == 'e')
- break;
- ptr = nextLF(b, ptr);
- }
- return match(b, ptr, encoding);
- }
-
- /**
- * Parse the "encoding " header into a character set reference.
- * <p>
- * Locates the "encoding " header (if present) by first calling
- * {@link #encoding(byte[], int)} and then returns the proper character set
- * to apply to this buffer to evaluate its contents as character data.
- * <p>
- * If no encoding header is present, {@link Constants#CHARSET} is assumed.
- *
- * @param b
- * buffer to scan.
- * @return the Java character set representation. Never null.
- */
- public static Charset parseEncoding(final byte[] b) {
- final int enc = encoding(b, 0);
- if (enc < 0)
- return Constants.CHARSET;
- final int lf = nextLF(b, enc);
- return Charset.forName(decode(Constants.CHARSET, b, enc, lf - 1));
- }
-
- /**
- * Parse a name line (e.g. author, committer, tagger) into a PersonIdent.
- * <p>
- * When passing in a value for <code>nameB</code> callers should use the
- * return value of {@link #author(byte[], int)} or
- * {@link #committer(byte[], int)}, as these methods provide the proper
- * position within the buffer.
- *
- * @param raw
- * the buffer to parse character data from.
- * @param nameB
- * first position of the identity information. This should be the
- * first position after the space which delimits the header field
- * name (e.g. "author" or "committer") from the rest of the
- * identity line.
- * @return the parsed identity. Never null.
- */
- public static PersonIdent parsePersonIdent(final byte[] raw, final int nameB) {
- final Charset cs = parseEncoding(raw);
- final int emailB = nextLF(raw, nameB, '<');
- final int emailE = nextLF(raw, emailB, '>');
-
- final String name = decode(cs, raw, nameB, emailB - 2);
- final String email = decode(cs, raw, emailB, emailE - 1);
-
- final MutableInteger ptrout = new MutableInteger();
- final long when = parseLongBase10(raw, emailE + 1, ptrout);
- final int tz = parseTimeZoneOffset(raw, ptrout.value);
-
- return new PersonIdent(name, email, when * 1000L, tz);
- }
-
- /**
- * Parse a name data (e.g. as within a reflog) into a PersonIdent.
- * <p>
- * When passing in a value for <code>nameB</code> callers should use the
- * return value of {@link #author(byte[], int)} or
- * {@link #committer(byte[], int)}, as these methods provide the proper
- * position within the buffer.
- *
- * @param raw
- * the buffer to parse character data from.
- * @param nameB
- * first position of the identity information. This should be the
- * first position after the space which delimits the header field
- * name (e.g. "author" or "committer") from the rest of the
- * identity line.
- * @return the parsed identity. Never null.
- */
- public static PersonIdent parsePersonIdentOnly(final byte[] raw, final int nameB) {
- int stop = nextLF(raw, nameB);
- int emailB = nextLF(raw, nameB, '<');
- int emailE = nextLF(raw, emailB, '>');
- final String name;
- final String email;
- if (emailE < stop) {
- email = decode(raw, emailB, emailE - 1);
- } else {
- email = "invalid";
- }
- if (emailB < stop)
- name = decode(raw, nameB, emailB - 2);
- else
- name = decode(raw, nameB, stop);
-
- final MutableInteger ptrout = new MutableInteger();
- long when;
- int tz;
- if (emailE < stop) {
- when = parseLongBase10(raw, emailE + 1, ptrout);
- tz = parseTimeZoneOffset(raw, ptrout.value);
- } else {
- when = 0;
- tz = 0;
- }
- return new PersonIdent(name, email, when * 1000L, tz);
- }
-
- /**
- * Locate the end of a footer line key string.
- * <p>
- * If the region at {@code raw[ptr]} matches {@code ^[A-Za-z0-9-]+:} (e.g.
- * "Signed-off-by: A. U. Thor\n") then this method returns the position of
- * the first ':'.
- * <p>
- * If the region at {@code raw[ptr]} does not match {@code ^[A-Za-z0-9-]+:}
- * then this method returns -1.
- *
- * @param raw
- * buffer to scan.
- * @param ptr
- * first position within raw to consider as a footer line key.
- * @return position of the ':' which terminates the footer line key if this
- * is otherwise a valid footer line key; otherwise -1.
- */
- public static int endOfFooterLineKey(final byte[] raw, int ptr) {
- try {
- for (;;) {
- final byte c = raw[ptr];
- if (footerLineKeyChars[c] == 0) {
- if (c == ':')
- return ptr;
- return -1;
- }
- ptr++;
- }
- } catch (ArrayIndexOutOfBoundsException e) {
- return -1;
- }
- }
-
- /**
- * Decode a buffer under UTF-8, if possible.
- *
- * If the byte stream cannot be decoded that way, the platform default is tried
- * and if that too fails, the fail-safe ISO-8859-1 encoding is tried.
- *
- * @param buffer
- * buffer to pull raw bytes from.
- * @return a string representation of the range <code>[start,end)</code>,
- * after decoding the region through the specified character set.
- */
- public static String decode(final byte[] buffer) {
- return decode(buffer, 0, buffer.length);
- }
-
- /**
- * Decode a buffer under UTF-8, if possible.
- *
- * If the byte stream cannot be decoded that way, the platform default is
- * tried and if that too fails, the fail-safe ISO-8859-1 encoding is tried.
- *
- * @param buffer
- * buffer to pull raw bytes from.
- * @param start
- * start position in buffer
- * @param end
- * one position past the last location within the buffer to take
- * data from.
- * @return a string representation of the range <code>[start,end)</code>,
- * after decoding the region through the specified character set.
- */
- public static String decode(final byte[] buffer, final int start,
- final int end) {
- return decode(Constants.CHARSET, buffer, start, end);
- }
-
- /**
- * Decode a buffer under the specified character set if possible.
- *
- * If the byte stream cannot be decoded that way, the platform default is tried
- * and if that too fails, the fail-safe ISO-8859-1 encoding is tried.
- *
- * @param cs
- * character set to use when decoding the buffer.
- * @param buffer
- * buffer to pull raw bytes from.
- * @return a string representation of the range <code>[start,end)</code>,
- * after decoding the region through the specified character set.
- */
- public static String decode(final Charset cs, final byte[] buffer) {
- return decode(cs, buffer, 0, buffer.length);
- }
-
- /**
- * Decode a region of the buffer under the specified character set if possible.
- *
- * If the byte stream cannot be decoded that way, the platform default is tried
- * and if that too fails, the fail-safe ISO-8859-1 encoding is tried.
- *
- * @param cs
- * character set to use when decoding the buffer.
- * @param buffer
- * buffer to pull raw bytes from.
- * @param start
- * first position within the buffer to take data from.
- * @param end
- * one position past the last location within the buffer to take
- * data from.
- * @return a string representation of the range <code>[start,end)</code>,
- * after decoding the region through the specified character set.
- */
- public static String decode(final Charset cs, final byte[] buffer,
- final int start, final int end) {
- try {
- return decodeNoFallback(cs, buffer, start, end);
- } catch (CharacterCodingException e) {
- // Fall back to an ISO-8859-1 style encoding. At least all of
- // the bytes will be present in the output.
- //
- return extractBinaryString(buffer, start, end);
- }
- }
-
- /**
- * Decode a region of the buffer under the specified character set if
- * possible.
- *
- * If the byte stream cannot be decoded that way, the platform default is
- * tried and if that too fails, an exception is thrown.
- *
- * @param cs
- * character set to use when decoding the buffer.
- * @param buffer
- * buffer to pull raw bytes from.
- * @param start
- * first position within the buffer to take data from.
- * @param end
- * one position past the last location within the buffer to take
- * data from.
- * @return a string representation of the range <code>[start,end)</code>,
- * after decoding the region through the specified character set.
- * @throws CharacterCodingException
- * the input is not in any of the tested character sets.
- */
- public static String decodeNoFallback(final Charset cs,
- final byte[] buffer, final int start, final int end)
- throws CharacterCodingException {
- final ByteBuffer b = ByteBuffer.wrap(buffer, start, end - start);
- b.mark();
-
- // Try our built-in favorite. The assumption here is that
- // decoding will fail if the data is not actually encoded
- // using that encoder.
- //
- try {
- return decode(b, Constants.CHARSET);
- } catch (CharacterCodingException e) {
- b.reset();
- }
-
- if (!cs.equals(Constants.CHARSET)) {
- // Try the suggested encoding, it might be right since it was
- // provided by the caller.
- //
- try {
- return decode(b, cs);
- } catch (CharacterCodingException e) {
- b.reset();
- }
- }
-
- // Try the default character set. A small group of people
- // might actually use the same (or very similar) locale.
- //
- final Charset defcs = Charset.defaultCharset();
- if (!defcs.equals(cs) && !defcs.equals(Constants.CHARSET)) {
- try {
- return decode(b, defcs);
- } catch (CharacterCodingException e) {
- b.reset();
- }
- }
-
- throw new CharacterCodingException();
- }
-
- /**
- * Decode a region of the buffer under the ISO-8859-1 encoding.
- *
- * Each byte is treated as a single character in the 8859-1 character
- * encoding, performing a raw binary->char conversion.
- *
- * @param buffer
- * buffer to pull raw bytes from.
- * @param start
- * first position within the buffer to take data from.
- * @param end
- * one position past the last location within the buffer to take
- * data from.
- * @return a string representation of the range <code>[start,end)</code>.
- */
- public static String extractBinaryString(final byte[] buffer,
- final int start, final int end) {
- final StringBuilder r = new StringBuilder(end - start);
- for (int i = start; i < end; i++)
- r.append((char) (buffer[i] & 0xff));
- return r.toString();
- }
-
- private static String decode(final ByteBuffer b, final Charset charset)
- throws CharacterCodingException {
- final CharsetDecoder d = charset.newDecoder();
- d.onMalformedInput(CodingErrorAction.REPORT);
- d.onUnmappableCharacter(CodingErrorAction.REPORT);
- return d.decode(b).toString();
- }
-
- /**
- * Locate the position of the commit message body.
- *
- * @param b
- * buffer to scan.
- * @param ptr
- * position in buffer to start the scan at. Most callers should
- * pass 0 to ensure the scan starts from the beginning of the
- * commit buffer.
- * @return position of the user's message buffer.
- */
- public static final int commitMessage(final byte[] b, int ptr) {
- final int sz = b.length;
- if (ptr == 0)
- ptr += 46; // skip the "tree ..." line.
- while (ptr < sz && b[ptr] == 'p')
- ptr += 48; // skip this parent.
-
- // Skip any remaining header lines, ignoring what their actual
- // header line type is. This is identical to the logic for a tag.
- //
- return tagMessage(b, ptr);
- }
-
- /**
- * Locate the position of the tag message body.
- *
- * @param b
- * buffer to scan.
- * @param ptr
- * position in buffer to start the scan at. Most callers should
- * pass 0 to ensure the scan starts from the beginning of the tag
- * buffer.
- * @return position of the user's message buffer.
- */
- public static final int tagMessage(final byte[] b, int ptr) {
- final int sz = b.length;
- if (ptr == 0)
- ptr += 48; // skip the "object ..." line.
- while (ptr < sz && b[ptr] != '\n')
- ptr = nextLF(b, ptr);
- if (ptr < sz && b[ptr] == '\n')
- return ptr + 1;
- return -1;
- }
-
- /**
- * Locate the end of a paragraph.
- * <p>
- * A paragraph is ended by two consecutive LF bytes.
- *
- * @param b
- * buffer to scan.
- * @param start
- * position in buffer to start the scan at. Most callers will
- * want to pass the first position of the commit message (as
- * found by {@link #commitMessage(byte[], int)}.
- * @return position of the LF at the end of the paragraph;
- * <code>b.length</code> if no paragraph end could be located.
- */
- public static final int endOfParagraph(final byte[] b, final int start) {
- int ptr = start;
- final int sz = b.length;
- while (ptr < sz && b[ptr] != '\n')
- ptr = nextLF(b, ptr);
- while (0 < ptr && start < ptr && b[ptr - 1] == '\n')
- ptr--;
- return ptr;
- }
-
- private RawParseUtils() {
- // Don't create instances of a static only utility.
- }
- }
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