This file is indexed.

/usr/include/firefox/gfxSkipChars.h is in firefox-dev 11.0+build1-0ubuntu4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Novell code.
 *
 * The Initial Developer of the Original Code is Novell.
 * Portions created by the Initial Developer are Copyright (C) 2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Robert O'Callahan <robert@ocallahan.org>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef GFX_SKIP_CHARS_H
#define GFX_SKIP_CHARS_H

#include "prtypes.h"
#include "nsAutoPtr.h"
#include "nsTArray.h"
#include "gfxTypes.h"

/*
 * gfxSkipChars is a data structure representing a list of characters that
 * have been skipped. The initial string is called the "original string"
 * and after skipping some characters, the result is called the "skipped string".
 * gfxSkipChars provides efficient ways to translate between offsets in the
 * original string and the skipped string. It is used by textrun code to keep
 * track of offsets before and after text transformations such as whitespace
 * compression and control code deletion.
 */

/**
 * gfxSkipCharsBuilder is a helper class that accumulates a list of (skip, keep)
 * commands and can eventually be used to construct a real gfxSkipChars.
 * gfxSkipCharsBuilder objects are quite large so don't keep these around.
 * On the positive side, the Skip/KeepChar(s) methods are very efficient,
 * especially when you have runs of all-kept or all-skipped characters.
 * 
 * mBuffer is an array of bytes; even numbered bytes represent characters kept,
 * odd numbered bytes represent characters skipped. After those characters
 * are accounted for, we have mRunCharCount characters which are kept or
 * skipped depending on the value of mRunSkipped.
 * 
 * mCharCount is the sum of counts of all skipped and kept characters, i.e.,
 * the length of the original string.
 */
class THEBES_API gfxSkipCharsBuilder {
public:
    gfxSkipCharsBuilder() :
        mCharCount(0), mRunCharCount(0), mRunSkipped(false), mInErrorState(false)
    {}
  
    void SkipChars(PRUint32 aChars) {
        DoChars(aChars, true);
    }
    void KeepChars(PRUint32 aChars) {
        DoChars(aChars, false);
    }
    void SkipChar() {
        SkipChars(1);
    }
    void KeepChar() {
        KeepChars(1);
    }
    void DoChars(PRUint32 aChars, bool aSkipped) {
        if (aSkipped != mRunSkipped && aChars > 0) {
            FlushRun();
        }
        NS_ASSERTION(mRunCharCount + aChars > mRunCharCount,
                     "Character count overflow");
        mRunCharCount += aChars;
    }

    bool IsOK() { return !mInErrorState; }

    PRUint32 GetCharCount() { return mCharCount + mRunCharCount; }
    bool GetAllCharsKept() { return mBuffer.Length() == 0; }

    friend class gfxSkipChars;

private:
    typedef AutoFallibleTArray<PRUint8,256> Buffer;

    /**
     * Moves mRunCharCount/mRunSkipped to the buffer (updating mCharCount),
     * sets mRunCharCount to zero and toggles mRunSkipped.
     */
    void FlushRun();
  
    Buffer       mBuffer;
    PRUint32     mCharCount;
    PRUint32     mRunCharCount;
    bool mRunSkipped; // == mBuffer.Length()&1
    bool mInErrorState;
};

/**
 * The gfxSkipChars list is represented as a list of bytes of the form
 * [chars to keep, chars to skip, chars to keep, chars to skip, ...]
 * In the special case where all chars are to be kept, the list is length
 * zero.
 * 
 * A freshly-created gfxSkipChars means "all chars kept".
 */
class THEBES_API gfxSkipChars {
public:
    gfxSkipChars() : mListLength(0), mCharCount(0) {}
  
    void TakeFrom(gfxSkipChars* aSkipChars) {
        mList = aSkipChars->mList.forget();
        mListLength = aSkipChars->mListLength;
        mCharCount = aSkipChars->mCharCount;
        aSkipChars->mCharCount = 0;
        aSkipChars->mListLength = 0;
        BuildShortcuts();
    }
  
    void TakeFrom(gfxSkipCharsBuilder* aSkipCharsBuilder) {
        if (!aSkipCharsBuilder->mBuffer.Length()) {
            NS_ASSERTION(!aSkipCharsBuilder->mRunSkipped, "out of sync");
            // all characters kept
            mCharCount = aSkipCharsBuilder->mRunCharCount;
            mList = nsnull;
            mListLength = 0;
        } else {
            aSkipCharsBuilder->FlushRun();
            mCharCount = aSkipCharsBuilder->mCharCount;
            mList = new PRUint8[aSkipCharsBuilder->mBuffer.Length()];
            if (!mList) {
                mListLength = 0;
            } else {
                mListLength = aSkipCharsBuilder->mBuffer.Length();
                memcpy(mList, aSkipCharsBuilder->mBuffer.Elements(), mListLength);
            }
        }
        aSkipCharsBuilder->mBuffer.Clear();
        aSkipCharsBuilder->mCharCount = 0;
        aSkipCharsBuilder->mRunCharCount = 0;    
        aSkipCharsBuilder->mRunSkipped = false;
        BuildShortcuts();
    }
  
    void SetAllKeep(PRUint32 aLength) {
        mCharCount = aLength;
        mList = nsnull;
        mListLength = 0;
    }
  
    PRInt32 GetOriginalCharCount() const { return mCharCount; }

    friend class gfxSkipCharsIterator;

private:
    struct Shortcut {
        PRUint32 mListPrefixLength;
        PRUint32 mListPrefixCharCount;
        PRUint32 mListPrefixKeepCharCount;
    
        Shortcut() {}
        Shortcut(PRUint32 aListPrefixLength, PRUint32 aListPrefixCharCount,
                 PRUint32 aListPrefixKeepCharCount) :
            mListPrefixLength(aListPrefixLength),
            mListPrefixCharCount(aListPrefixCharCount),
            mListPrefixKeepCharCount(aListPrefixKeepCharCount) {}
    };
  
    void BuildShortcuts();

    nsAutoArrayPtr<PRUint8>  mList;
    nsAutoArrayPtr<Shortcut> mShortcuts;
    PRUint32                 mListLength;
    PRUint32                 mCharCount;
};

/**
 * A gfxSkipCharsIterator represents a position in the original string. It lets you
 * map efficiently to and from positions in the string after skipped characters
 * have been removed. You can also specify an offset that is added to all
 * incoming original string offsets and subtracted from all outgoing original
 * string offsets --- useful when the gfxSkipChars corresponds to something
 * offset from the original DOM coordinates, which it often does for gfxTextRuns.
 * 
 * The current positions (in both the original and skipped strings) are
 * always constrained to be >= 0 and <= the string length. When the position
 * is equal to the string length, it is at the end of the string. The current
 * positions do not include any aOriginalStringToSkipCharsOffset.
 * 
 * When the position in the original string corresponds to a skipped character,
 * the skipped-characters offset is the offset of the next unskipped character,
 * or the skipped-characters string length if there is no next unskipped character.
 */
class THEBES_API gfxSkipCharsIterator {
public:
    /**
     * @param aOriginalStringToSkipCharsOffset add this to all incoming and
     * outgoing original string offsets
     */
    gfxSkipCharsIterator(const gfxSkipChars& aSkipChars,
                         PRInt32 aOriginalStringToSkipCharsOffset,
                         PRInt32 aOriginalStringOffset)
        : mSkipChars(&aSkipChars),
          mOriginalStringToSkipCharsOffset(aOriginalStringToSkipCharsOffset),
          mListPrefixLength(0), mListPrefixCharCount(0), mListPrefixKeepCharCount(0) {
          SetOriginalOffset(aOriginalStringOffset);
    }

    gfxSkipCharsIterator(const gfxSkipChars& aSkipChars,
                         PRInt32 aOriginalStringToSkipCharsOffset = 0)
        : mSkipChars(&aSkipChars),
          mOriginalStringOffset(0), mSkippedStringOffset(0),
          mOriginalStringToSkipCharsOffset(aOriginalStringToSkipCharsOffset),
          mListPrefixLength(0), mListPrefixCharCount(0), mListPrefixKeepCharCount(0) {
    }

    gfxSkipCharsIterator(const gfxSkipCharsIterator& aIterator)
        : mSkipChars(aIterator.mSkipChars),
          mOriginalStringOffset(aIterator.mOriginalStringOffset),
          mSkippedStringOffset(aIterator.mSkippedStringOffset),
          mOriginalStringToSkipCharsOffset(aIterator.mOriginalStringToSkipCharsOffset),
          mListPrefixLength(aIterator.mListPrefixLength),
          mListPrefixCharCount(aIterator.mListPrefixCharCount),
          mListPrefixKeepCharCount(aIterator.mListPrefixKeepCharCount)
    {}
  
    /**
     * The empty constructor creates an object that is useless until it is assigned.
     */
    gfxSkipCharsIterator() : mSkipChars(nsnull) {}

    /**
     * Return true if this iterator is properly initialized and usable.
     */  
    bool IsInitialized() { return mSkipChars != nsnull; }

    /**
     * Set the iterator to aOriginalStringOffset in the original string.
     * This can efficiently move forward or backward from the current position.
     * aOriginalStringOffset is clamped to [0,originalStringLength].
     */
    void SetOriginalOffset(PRInt32 aOriginalStringOffset) {
        SetOffsets(aOriginalStringOffset + mOriginalStringToSkipCharsOffset, true);
    }
    
    /**
     * Set the iterator to aSkippedStringOffset in the skipped string.
     * This can efficiently move forward or backward from the current position.
     * aSkippedStringOffset is clamped to [0,skippedStringLength].
     */
    void SetSkippedOffset(PRUint32 aSkippedStringOffset) {
        SetOffsets(aSkippedStringOffset, false);
    }
    
    PRUint32 ConvertOriginalToSkipped(PRInt32 aOriginalStringOffset) {
        SetOriginalOffset(aOriginalStringOffset);
        return GetSkippedOffset();
    }
    PRUint32 ConvertSkippedToOriginal(PRInt32 aSkippedStringOffset) {
        SetSkippedOffset(aSkippedStringOffset);
        return GetOriginalOffset();
    }
  
    /**
     * Test if the character at the current position in the original string
     * is skipped or not. If aRunLength is non-null, then *aRunLength is set
     * to a number of characters all of which are either skipped or not, starting
     * at this character. When the current position is at the end of the original
     * string, we return true and *aRunLength is set to zero.
     */
    bool IsOriginalCharSkipped(PRInt32* aRunLength = nsnull) const;
    
    void AdvanceOriginal(PRInt32 aDelta) {
        SetOffsets(mOriginalStringOffset + aDelta, true);
    }
    void AdvanceSkipped(PRInt32 aDelta) {
        SetOffsets(mSkippedStringOffset + aDelta, false);
    }
  
    /**
     * @return the offset within the original string
     */
    PRInt32 GetOriginalOffset() const {
        return mOriginalStringOffset - mOriginalStringToSkipCharsOffset;
    }
    /**
     * @return the offset within the skipped string corresponding to the
     * current position in the original string. If the current position
     * in the original string is a character that is skipped, then we return
     * the position corresponding to the first non-skipped character in the
     * original string after the current position, or the length of the skipped
     * string if there is no such character.
     */
    PRUint32 GetSkippedOffset() const { return mSkippedStringOffset; }

    PRInt32 GetOriginalEnd() const {
        return mSkipChars->GetOriginalCharCount() -
            mOriginalStringToSkipCharsOffset;
    }

private:
    void SetOffsets(PRUint32 aOffset, bool aInOriginalString);
  
    const gfxSkipChars* mSkipChars;
    PRInt32 mOriginalStringOffset;
    PRUint32 mSkippedStringOffset;

    // This offset is added to map from "skipped+unskipped characters in
    // the original DOM string" character space to "skipped+unskipped
    // characters in the textrun's gfxSkipChars" character space
    PRInt32 mOriginalStringToSkipCharsOffset;

    /*
     * This is used to speed up cursor-style traversal. The invariant is that
     * the first mListPrefixLength bytes of mSkipChars.mList sum to
     * mListPrefixCharCount, and the even-indexed bytes in that prefix sum to
     * mListPrefixKeepCharCount.
     * Also, 0 <= mListPrefixLength < mSkipChars.mListLength, or else
     * mSkipChars.mListLength is zero.
     * Also, mListPrefixCharCount <= mOriginalStringOffset (and therefore
     * mListPrefixKeepCharCount < mSkippedStringOffset).
     */
    PRUint32 mListPrefixLength;
    PRUint32 mListPrefixCharCount;
    PRUint32 mListPrefixKeepCharCount;
};

#endif /*GFX_SKIP_CHARS_H*/