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Annotation of objc/NXReadWriteString.m, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.0 (the 'License').  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License."
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: /*
        !            25:        NXReadWriteString.m
        !            26:        Copyright 1991, NeXT, Inc.
        !            27:        Responsibility:
        !            28: */
        !            29: 
        !            30: #ifndef KERNEL
        !            31: #ifdef SHLIB
        !            32: #import "shlib.h"
        !            33: #endif SHLIB
        !            34: 
        !            35: #import "NXStringPrivate.h"
        !            36: 
        !            37: @implementation NXReadWriteString
        !            38: 
        !            39: #define actStr ((struct {@defs(NXReadOnlyString);} *)actualString)
        !            40: 
        !            41: - initFromCharactersNoCopy:(unichar *)chars length:(unsigned)len
        !            42: {
        !            43:     return [self initFromCharactersNoCopy:chars length:len freeWhenDone:YES];
        !            44: }
        !            45: 
        !            46: // To allow for cheap creation of empty read/write strings (with init, say),
        !            47: // we keep around an empty readonly string and hand out copies of it whenever
        !            48: // necessary.  A mutex could be used in the code below to prevent the one-time leak
        !            49: // of one or more NXReadOnlyStrings. However, the chances of the leak are so small 
        !            50: // it's not clear we should bother.
        !            51: 
        !            52: - initFromCharactersNoCopy:(unichar *)chars length:(unsigned)len freeWhenDone:(BOOL)flag
        !            53: {
        !            54:     static NXReadOnlyString *emptyReadOnlyString = nil;
        !            55:     [super initFromCharactersNoCopy:chars length:len];
        !            56:     if (len == 0 && emptyReadOnlyString) {
        !            57:        actualString = [emptyReadOnlyString copy];
        !            58:     } else {
        !            59:        actualString = [[NXReadOnlyString allocFromZone:[self zone]] initFromCharactersNoCopy:len ? chars : NULL length:len freeWhenDone:flag];
        !            60:        if (len == 0 && !emptyReadOnlyString) {         // ??? mutex could be used to prevent possible leak
        !            61:            emptyReadOnlyString = [actualString copy];
        !            62:        }
        !            63:     }
        !            64:     return self;
        !            65: }
        !            66: 
        !            67: - (unsigned)length
        !            68: {
        !            69:     return actStr->_length;
        !            70: }
        !            71: 
        !            72: - (unichar)characterAt:(unsigned)loc
        !            73: {
        !            74:     if (loc >= actStr->_length) BOUNDSERROR;
        !            75:     return actStr->characters[loc];
        !            76: }
        !            77: 
        !            78: - (unichar *)allocateCharacterBuffer:(unsigned)nChars
        !            79: {
        !            80:     return NX_CHARALLOC(stringZone, nChars);
        !            81: }
        !            82: 
        !            83: - (void)getCharacters:(unichar *)buffer range:(NXRange)range
        !            84: {
        !            85:     if (RNGLOC(range) + RNGLEN(range) > actStr->_length) BOUNDSERROR;
        !            86:     NX_CHARCOPY(actStr->characters + RNGLOC(range), buffer, RNGLEN(range));
        !            87: }
        !            88: 
        !            89: - (void)getCString:(char *)buffer maxLength:(unsigned)bytes range:(NXRange)range remainingRange:(NXRange *)leftover
        !            90: {
        !            91: #if CHARS_ARE_EIGHT_BIT
        !            92:     NXRange desiredRange = range;
        !            93:     unsigned cnt;
        !            94:     if (RNGLOC(range) + RNGLEN(range) > actStr->_length) BOUNDSERROR;
        !            95:     if (RNGLEN(range) > bytes) RNGLEN(range) = bytes;
        !            96:     for (cnt = 0; cnt < RNGLEN(range); cnt++) {
        !            97:         unichar ch = actStr->characters[RNGLOC(range) + cnt];
        !            98:        buffer[cnt] = (ch > 0x0ff) ? NX_UNREPRESENTABLE_CHARACTER : ch;
        !            99:     }
        !           100:     buffer[RNGLEN(range)] = 0;
        !           101:     if (leftover) {
        !           102:        RNGLOC(*leftover) = RNGLOC(desiredRange) + RNGLEN(range);
        !           103:        RNGLEN(*leftover) = RNGLEN(desiredRange) - RNGLEN(range);
        !           104:     }
        !           105: #else
        !           106: #warning getCString:maxLength:range:remainingRange: not implemented for Unicode
        !           107:     _NXStringErrorRaise (NXStringInternalError, "getCString:maxLength:range:remainingRange: not implemented for Unicode");
        !           108: #endif
        !           109: }
        !           110: 
        !           111: // ??? Most of these methods simply forward the message onto the actualString, so we
        !           112: // might just want to use forwarding here...
        !           113: 
        !           114: - (NXComparisonResult)compare:string mask:(unsigned int)options table:(void *)table
        !           115: {
        !           116:     return [actualString compare:string mask:options table:table];
        !           117: }
        !           118: 
        !           119: - (NXRange)findString:(NXString *)findStr range:(NXRange)fRange mask:(unsigned int)options table:(void *)table
        !           120: {
        !           121:     return [actualString findString:findStr range:fRange mask:options table:table];
        !           122: }
        !           123: 
        !           124: - (unsigned)findCharacter:(unichar)ch range:(NXRange)fRange mask:(unsigned int)options table:(void *)table
        !           125: {
        !           126:     return [actualString findCharacter:ch range:fRange mask:options table:NULL];
        !           127: }
        !           128: 
        !           129: - (unsigned)findOneOf:(NXCharacterSet *)set range:(NXRange)fRange mask:(unsigned int)options table:(void *)table
        !           130: {
        !           131:     return [actualString findOneOf:set range:fRange mask:options table:table];
        !           132: }
        !           133: 
        !           134: - (unsigned)hash
        !           135: {
        !           136:     return [actualString hash];
        !           137: }
        !           138: 
        !           139: - (void)replaceCharactersInRange:(NXRange)range withString:(NXString *)string
        !           140: {
        !           141:     unsigned int newLength, len = [self length], otherLength = [string length];
        !           142:     unichar *newBuffer;
        !           143:     NXRange strRange = {0, otherLength};
        !           144: 
        !           145:     if (RNGLOC(range) + RNGLEN(range) > len) BOUNDSERROR;   
        !           146: 
        !           147:     newLength = len + otherLength - RNGLEN(range);
        !           148:     newBuffer = [self allocateCharacterBuffer:newLength];
        !           149: 
        !           150:     // Copy the three chunks into the new buffer
        !           151: 
        !           152:     NX_CHARCOPY (actStr->characters, newBuffer, RNGLOC(range));
        !           153:     [string getCharacters:(newBuffer + RNGLOC(range)) range:strRange];
        !           154:     NX_CHARCOPY (actStr->characters + (RNGLOC(range) + RNGLEN(range)), newBuffer + RNGLOC(range) + otherLength, (len - (RNGLOC(range) + RNGLEN(range))));
        !           155: 
        !           156:     // Now the new buffer is created. See what we do with the old one...
        !           157: 
        !           158:     if (actStr->_flags.refs > 1) {
        !           159:         actStr->_flags.refs -= 1;
        !           160:         actualString = [[NXReadOnlyString allocFromZone:[self zone]] initFromCharactersNoCopy:newBuffer length:newLength freeWhenDone:YES];
        !           161:     } else {
        !           162:         if (!actStr->_flags.notCopied) {
        !           163:             free (actStr->characters);
        !           164:         }
        !           165:         actStr->_length = newLength;
        !           166:         actStr->characters = newBuffer;
        !           167:     }
        !           168: }
        !           169: 
        !           170: - copyFromZone:(NXZone *)zone
        !           171: {
        !           172:     NXReadWriteString *newInstance = [super copyFromZone:zone];
        !           173:     newInstance->actualString = [actualString copy];
        !           174:     return newInstance;
        !           175: }
        !           176: 
        !           177: - immutableCopyFromZone:(NXZone *)zone
        !           178: {
        !           179:     return [actualString copyFromZone:zone];
        !           180: }
        !           181: 
        !           182: - free
        !           183: {
        !           184:     [actualString free];
        !           185:     return [super free];
        !           186: }
        !           187: 
        !           188: - write:(NXTypedStream *)s
        !           189: {
        !           190:     [super write:s];
        !           191:     NXWriteObject (s, actualString);
        !           192:     return self;
        !           193: }
        !           194: 
        !           195: - read:(NXTypedStream *)s
        !           196: {
        !           197:     [super read:s];
        !           198:     actualString = NXReadObject (s);
        !           199:     return self;
        !           200: }
        !           201: 
        !           202: // We want to make sure the object itself comes out of the string zone
        !           203: // and not some random area which might be deallocated later...
        !           204: 
        !           205: - finishUnarchiving
        !           206: {
        !           207:     id actual = nil; 
        !           208:     if ([self zone] != stringZone) {
        !           209:         actual = object_copyFromZone (self, 0, stringZone);
        !           210:         object_dispose(self);
        !           211:     }
        !           212:     return actual;
        !           213: }
        !           214: 
        !           215: 
        !           216: @end
        !           217: #endif

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