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Annotation of objc/NXReadOnlyString.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:        NXReadOnlyString.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 NXReadOnlyString
        !            38: 
        !            39: + alloc
        !            40: {
        !            41:     return [super allocFromZone:stringZone];
        !            42: }
        !            43:  
        !            44: + allocFromZone:(NXZone *)zone
        !            45: {
        !            46:     return [super allocFromZone:stringZone];
        !            47: }
        !            48: 
        !            49: - initFromCharactersNoCopy:(unichar *)chars length:(unsigned)len
        !            50: {
        !            51:     return [self initFromCharactersNoCopy:chars length:len freeWhenDone:YES];
        !            52: }
        !            53: 
        !            54: - initFromCharactersNoCopy:(unichar *)chars length:(unsigned)len freeWhenDone:(BOOL)flag
        !            55: {
        !            56:     [super initFromCharactersNoCopy:chars length:len];
        !            57:     _flags.notCopied = !flag;
        !            58:     _flags.refs = 1;
        !            59:     return self;
        !            60: }
        !            61: 
        !            62: - (unichar *)allocateCharacterBuffer:(unsigned)nChars
        !            63: {
        !            64:     return NX_CHARALLOC(stringZone, nChars);
        !            65: }
        !            66: 
        !            67: - copyFromZone:(NXZone *)zone
        !            68: {
        !            69:     if (_flags.refs < NX_STRING_MAXREFS) _flags.refs += 1;
        !            70:     return self;
        !            71: }
        !            72: 
        !            73: - (NXString *)copySubstring:(NXRange)range fromZone:(NXZone *)zone
        !            74: {
        !            75:     if (RNGLOC(range) + RNGLEN(range) > _length) BOUNDSERROR;
        !            76:     if (RNGLOC(range) == 0 && RNGLEN(range) == _length) {
        !            77:        return [self copyFromZone:zone];
        !            78:     } else {
        !            79:        id newInstance = [[NXReadOnlySubstring allocFromZone:zone] initFromCharactersNoCopy:characters + RNGLOC(range) length:RNGLEN(range) freeWhenDone:NO];
        !            80:        ((struct {@defs(NXReadOnlySubstring);} *)newInstance)->_referenceString = [self copy];
        !            81:        return newInstance;
        !            82:     }
        !            83: }
        !            84: 
        !            85: - mutableCopyFromZone:(NXZone *)zone
        !            86: {
        !            87:     id newInstance = [NXReadWriteString allocFromZone:zone];
        !            88:     ((struct {@defs(NXReadWriteString);} *)newInstance)->actualString = [self copyFromZone:zone];
        !            89:     return newInstance;
        !            90: }
        !            91: 
        !            92: - free
        !            93: {
        !            94:     if ((_flags.refs < NX_STRING_MAXREFS) && (--_flags.refs == 0)) {
        !            95:         if (_flags.notCopied) {
        !            96:             characters = NULL; // So the super won't attempt to free the buffer...
        !            97:         }
        !            98:         return [super free];
        !            99:     } else {
        !           100:        return nil;
        !           101:     }
        !           102: }
        !           103: 
        !           104: // We want to make sure the object itself comes out of the string zone
        !           105: // and not some random area which might be deallocated later...
        !           106: 
        !           107: - finishUnarchiving
        !           108: {
        !           109:     id actual = nil; 
        !           110:     if ([self zone] != stringZone) {
        !           111:         actual = object_copyFromZone (self, 0, stringZone);
        !           112:         object_dispose(self);
        !           113:     }
        !           114:     return actual;
        !           115: }
        !           116: 
        !           117: - write:(NXTypedStream *)s
        !           118: {
        !           119:     unsigned int refs = _flags.refs;
        !           120:     [super write:s];
        !           121:     NXWriteTypes (s, "i", &refs);
        !           122:     return self;
        !           123: }
        !           124: 
        !           125: - read:(NXTypedStream *)s
        !           126: {
        !           127:     unsigned int refs;
        !           128:     [super read:s];
        !           129:     NXReadTypes (s, "i", &refs);
        !           130:     _flags.refs = refs;
        !           131:     return self;
        !           132: }
        !           133: 
        !           134: @end
        !           135: #endif

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