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960 lines (851 loc) · 23.7 KB
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/** Class for serialization in GNUStep
Copyright (C) 1997 Free Software Foundation, Inc.
Written by: Richard Frith-Macdoanld <richard@brainstorm.co.uk>
Date: August 1997
This file is part of the GNUstep Base Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110 USA.
<title>NSSerializer class reference</title>
$Date$ $Revision$
*/
#import "common.h"
#import "Foundation/NSData.h"
#import "Foundation/NSDictionary.h"
#import "Foundation/NSArray.h"
#import "Foundation/NSException.h"
#import "Foundation/NSEnumerator.h"
#import "Foundation/NSProxy.h"
#import "Foundation/NSLock.h"
#import "Foundation/NSSet.h"
#import "Foundation/NSThread.h"
#import "Foundation/NSNotification.h"
#import "Foundation/NSNotificationQueue.h"
#import "Foundation/NSValue.h"
#import "GSPrivate.h"
@class GSDictionary;
@class GSMutableDictionary;
@interface GSMutableDictionary : NSObject // Help the compiler
@end
@class NSDataMalloc;
@interface NSDataMalloc : NSObject // Help the compiler
@end
/*
* Setup for inline operation of string map tables.
*/
#define GSI_MAP_KTYPES GSUNION_OBJ
#define GSI_MAP_VTYPES GSUNION_NSINT
#define GSI_MAP_RETAIN_KEY(M, X)
#define GSI_MAP_RELEASE_KEY(M, X)
#define GSI_MAP_RETAIN_VAL(M, X)
#define GSI_MAP_RELEASE_VAL(M, X)
#define GSI_MAP_HASH(M, X) [(X).obj hash]
#define GSI_MAP_EQUAL(M, X,Y) [(X).obj isEqualToString: (Y).obj]
#define GSI_MAP_NOCLEAN 1
#include "GNUstepBase/GSIMap.h"
/*
* Setup for inline operation of string arrays.
*/
#define GSI_ARRAY_NO_RETAIN 1
#define GSI_ARRAY_NO_RELEASE 1
#define GSI_ARRAY_TYPES GSUNION_OBJ
#include "GNUstepBase/GSIArray.h"
/*
* Define constants for data types and variables to hold them.
*/
#define ST_XREF 0
#define ST_CSTRING 1
#define ST_STRING 2
#define ST_ARRAY 3
#define ST_MARRAY 4
#define ST_DICT 5
#define ST_MDICT 6
#define ST_DATA 7
#define ST_DATE 8
#define ST_NUMBER 9
static char st_xref = (char)ST_XREF;
static char st_cstring = (char)ST_CSTRING;
static char st_string = (char)ST_STRING;
static char st_array = (char)ST_ARRAY;
static char st_marray = (char)ST_MARRAY;
static char st_dict = (char)ST_DICT;
static char st_mdict = (char)ST_MDICT;
static char st_data = (char)ST_DATA;
static char st_date = (char)ST_DATE;
static char st_number = (char)ST_NUMBER;
/*
* Variables to cache class information. These are used to check how
* an instance should be serialized.
*/
static Class ArrayClass = 0;
static Class MutableArrayClass = 0;
static Class DataClass = 0;
static Class DateClass = 0;
static Class DictionaryClass = 0;
static Class MutableDictionaryClass = 0;
static Class StringClass = 0;
static Class NumberClass = 0;
typedef struct {
NSMutableData *data;
void (*appImp)(NSData*,SEL,const void*,unsigned);
void* (*datImp)(NSMutableData*,SEL); // Bytes pointer.
unsigned int (*lenImp)(NSData*,SEL); // Length of data.
void (*serImp)(NSMutableData*,SEL,int); // Serialize integer.
void (*setImp)(NSMutableData*,SEL,unsigned); // Set length of data.
unsigned count; // String counter.
GSIMapTable_t map; // For uniquing.
BOOL shouldUnique; // Do we do uniquing?
} _NSSerializerInfo;
static SEL appSel;
static SEL datSel;
static SEL lenSel;
static SEL serSel;
static SEL setSel;
static void
initSerializerInfo(_NSSerializerInfo* info, NSMutableData *d, BOOL u)
{
Class c;
c = object_getClass(d);
info->data = d;
info->appImp = (void (*)(NSData*,SEL,const void*,unsigned))
class_getMethodImplementation(c, appSel);
info->datImp = (void* (*)(NSMutableData*,SEL))
class_getMethodImplementation(c, datSel);
info->lenImp = (unsigned int (*)(NSData*,SEL))
class_getMethodImplementation(c, lenSel);
info->serImp = (void (*)(NSMutableData*,SEL,int))
class_getMethodImplementation(c, serSel);
info->setImp = (void (*)(NSMutableData*,SEL,unsigned))
class_getMethodImplementation(c, setSel);
info->shouldUnique = u;
(*info->appImp)(d, appSel, &info->shouldUnique, 1);
if (u)
{
GSIMapInitWithZoneAndCapacity(&info->map, NSDefaultMallocZone(), 16);
info->count = 0;
}
}
static void
endSerializerInfo(_NSSerializerInfo* info)
{
if (info->shouldUnique)
GSIMapEmptyMap(&info->map);
}
static void
serializeToInfo(id object, _NSSerializerInfo* info)
{
Class c;
if (object == nil || GSObjCIsInstance(object) == NO)
{
[NSException raise: NSInvalidArgumentException
format: @"Class (%@) in property list - expected instance",
[object description]];
}
c = object_getClass(object);
if (GSObjCIsKindOf(c, StringClass)
/*
We can only save it as a c-string if it only contains ASCII characters.
Other characters might be decoded incorrectly when deserialized since
the c-string encoding might be different then.
*/
&& [object canBeConvertedToEncoding: NSASCIIStringEncoding])
{
GSIMapNode node;
if (info->shouldUnique)
node = GSIMapNodeForKey(&info->map, (GSIMapKey)object);
else
node = 0;
if (node == 0)
{
unsigned slen;
unsigned dlen;
slen = [object length] + 1;
(*info->appImp)(info->data, appSel, &st_cstring, 1);
(*info->serImp)(info->data, serSel, slen);
dlen = (*info->lenImp)(info->data, lenSel);
(*info->setImp)(info->data, setSel, dlen + slen);
[object getCString: (*info->datImp)(info->data, datSel) + dlen
maxLength: slen
encoding: NSASCIIStringEncoding];
if (info->shouldUnique)
GSIMapAddPair(&info->map,
(GSIMapKey)object, (GSIMapVal)(NSUInteger)info->count++);
}
else
{
(*info->appImp)(info->data, appSel, &st_xref, 1);
(*info->serImp)(info->data, serSel, node->value.nsu);
}
}
else if (GSObjCIsKindOf(c, StringClass))
{
GSIMapNode node;
if (info->shouldUnique)
node = GSIMapNodeForKey(&info->map, (GSIMapKey)object);
else
node = 0;
if (node == 0)
{
unsigned slen;
unsigned dlen;
slen = [object length];
(*info->appImp)(info->data, appSel, &st_string, 1);
(*info->serImp)(info->data, serSel, slen);
dlen = (*info->lenImp)(info->data, lenSel);
(*info->setImp)(info->data, setSel, dlen + slen*sizeof(unichar));
#if NEED_WORD_ALIGNMENT
/*
* When packing data, an item may not be aligned on a
* word boundary, so we work with an aligned buffer
* and use memcmpy()
*/
if ((dlen % __alignof__(uint32_t)) != 0)
{
unichar buffer[slen];
[object getCharacters: buffer];
memcpy((*info->datImp)(info->data, datSel) + dlen, buffer,
slen*sizeof(unichar));
}
else
#endif
[object getCharacters: (*info->datImp)(info->data, datSel) + dlen];
if (info->shouldUnique)
GSIMapAddPair(&info->map,
(GSIMapKey)object, (GSIMapVal)(NSUInteger)info->count++);
}
else
{
(*info->appImp)(info->data, appSel, &st_xref, 1);
(*info->serImp)(info->data, serSel, node->value.nsu);
}
}
else if (GSObjCIsKindOf(c, ArrayClass))
{
unsigned int count;
if ([object isKindOfClass: MutableArrayClass])
(*info->appImp)(info->data, appSel, &st_marray, 1);
else
(*info->appImp)(info->data, appSel, &st_array, 1);
count = [object count];
(*info->serImp)(info->data, serSel, count);
if (count)
{
id objects[count];
unsigned int i;
if ([object isProxy])
{
for (i = 0; i < count; i++)
{
objects[i] = [object objectAtIndex: i];
}
}
else
{
[object getObjects: objects];
}
for (i = 0; i < count; i++)
{
serializeToInfo(objects[i], info);
}
}
}
else if (GSObjCIsKindOf(c, DictionaryClass))
{
NSEnumerator *e = [object keyEnumerator];
id k;
IMP nxtImp;
IMP objImp;
nxtImp = [e methodForSelector: @selector(nextObject)];
objImp = [object methodForSelector: @selector(objectForKey:)];
if ([object isKindOfClass: MutableDictionaryClass])
(*info->appImp)(info->data, appSel, &st_mdict, 1);
else
(*info->appImp)(info->data, appSel, &st_dict, 1);
(*info->serImp)(info->data, serSel, [object count]);
while ((k = (*nxtImp)(e, @selector(nextObject))) != nil)
{
id o = (*objImp)(object, @selector(objectForKey:), k);
serializeToInfo(k, info);
serializeToInfo(o, info);
}
}
else if (GSObjCIsKindOf(c, DataClass))
{
(*info->appImp)(info->data, appSel, &st_data, 1);
(*info->serImp)(info->data, serSel, [object length]);
(*info->appImp)(info->data, appSel, [object bytes], [object length]);
}
else if (GSObjCIsKindOf(c, DateClass))
{
NSTimeInterval ti = [object timeIntervalSinceReferenceDate];
(*info->appImp)(info->data, appSel, &st_date, 1);
[info->data serializeDataAt: &ti
ofObjCType: @encode(NSTimeInterval)
context: nil];
}
else if (GSObjCIsKindOf(c, NumberClass))
{
double d = [object doubleValue];
(*info->appImp)(info->data, appSel, &st_number, 1);
[info->data serializeDataAt: &d
ofObjCType: @encode(double)
context: nil];
}
else
{
[NSException raise: NSInvalidArgumentException
format: @"Unknown class (%@) in property list",
[c description]];
}
}
@implementation NSSerializer
static BOOL shouldBeCompact = NO;
+ (void) initialize
{
if (self == [NSSerializer class])
{
appSel = @selector(appendBytes:length:);
datSel = @selector(mutableBytes);
lenSel = @selector(length);
serSel = @selector(serializeInt:);
setSel = @selector(setLength:);
ArrayClass = [NSArray class];
MutableArrayClass = [NSMutableArray class];
DataClass = [NSData class];
DateClass = [NSDate class];
NumberClass = [NSNumber class];
DictionaryClass = [NSDictionary class];
MutableDictionaryClass = [NSMutableDictionary class];
StringClass = [NSString class];
}
}
/**
* Converts the supplied propertyList into a serialized representation
* in the returned NSData object.
*/
+ (NSData*) serializePropertyList: (id)propertyList
{
_NSSerializerInfo info;
NSMutableData *d;
NSAssert(propertyList != nil, NSInvalidArgumentException);
d = [NSMutableData dataWithCapacity: 1024];
initSerializerInfo(&info, d, shouldBeCompact);
serializeToInfo(propertyList, &info);
endSerializerInfo(&info);
return info.data;
}
/**
* Converts the supplied propertyList into a serialized representation
* stored in d.
*/
+ (void) serializePropertyList: (id)propertyList
intoData: (NSMutableData*)d
{
_NSSerializerInfo info;
NSAssert(propertyList != nil, NSInvalidArgumentException);
NSAssert(d != nil, NSInvalidArgumentException);
initSerializerInfo(&info, d, shouldBeCompact);
serializeToInfo(propertyList, &info);
endSerializerInfo(&info);
}
@end
@implementation NSSerializer (GNUstep)
+ (void) serializePropertyList: (id)propertyList
intoData: (NSMutableData*)d
compact: (BOOL)flag
{
_NSSerializerInfo info;
NSAssert(propertyList != nil, NSInvalidArgumentException);
NSAssert(d != nil, NSInvalidArgumentException);
initSerializerInfo(&info, d, flag);
serializeToInfo(propertyList, &info);
endSerializerInfo(&info);
}
+ (void) shouldBeCompact: (BOOL)flag
{
shouldBeCompact = flag;
}
@end
static BOOL uniquing = NO; /* Make incoming strings unique */
/*
* Variables to cache class information. These are used to create instances
* when deserializing.
*/
static Class MACls = 0; /* Mutable Array */
static Class DCls = 0; /* Data */
static Class MDCls = 0; /* Mutable Dictionary */
typedef struct {
NSData *data;
unsigned *cursor;
BOOL mutable;
BOOL didUnique;
void (*debImp)();
unsigned int (*deiImp)();
GSIArray_t array;
} _NSDeserializerInfo;
static SEL debSel;
static SEL deiSel;
static SEL dInitSel;
static SEL maInitSel;
static SEL mdInitSel;
static SEL maAddSel;
static SEL mdSetSel;
static IMP dInitImp;
static IMP maInitImp;
static IMP mdInitImp;
static IMP maAddImp;
static IMP mdSetImp;
static BOOL
initDeserializerInfo(_NSDeserializerInfo* info, NSData *d, unsigned *c, BOOL m)
{
unsigned char u;
info->data = d;
info->cursor = c;
info->mutable = m;
info->debImp = (void (*)())[d methodForSelector: debSel];
info->deiImp = (unsigned int (*)())[d methodForSelector: deiSel];
(*info->debImp)(d, debSel, &u, 1, c);
if (u == 0 || u == 1)
{
info->didUnique = u; // Old (current) format
}
else
{
if (u == 'G')
{
const unsigned char *b = [d bytes];
unsigned int l = [d length];
if (*c + 11 < l && memcmp(&b[*c-1], "GNUstepSer", 10) == 0)
{
*c += 9;
(*info->debImp)(d, debSel, &u, 1, c);
NSLog(@"Serialised data version %d not supported ..."
@" try another version of GNUstep", u);
return NO;
}
}
NSLog(@"Bad serialised data");
return NO;
}
if (info->didUnique)
{
GSIArrayInitWithZoneAndCapacity(&info->array, NSDefaultMallocZone(), 16);
}
return YES;
}
static void
endDeserializerInfo(_NSDeserializerInfo* info)
{
if (info->didUnique)
{
GSIArrayEmpty(&info->array);
}
}
static id
deserializeFromInfo(_NSDeserializerInfo* info)
{
char code;
unsigned int size;
(*info->debImp)(info->data, debSel, &code, 1, info->cursor);
switch (code)
{
case ST_XREF:
if (info->didUnique)
{
size = (*info->deiImp)(info->data, deiSel, info->cursor);
if (size < GSIArrayCount(&info->array))
{
return RETAIN(GSIArrayItemAtIndex(&info->array, size).obj);
}
else
{
[NSException raise: NSInvalidArgumentException
format: @"Bad cross reference in property list"];
}
}
else
{
[NSException raise: NSInvalidArgumentException
format: @"Unexpected cross reference in property list"];
}
case ST_CSTRING:
{
NSString *s;
char *b;
size = (*info->deiImp)(info->data, deiSel, info->cursor);
b = NSZoneMalloc(NSDefaultMallocZone(), size);
(*info->debImp)(info->data, debSel, b, size, info->cursor);
s = [[StringClass alloc] initWithBytesNoCopy: b
length: size - 1
encoding: NSASCIIStringEncoding
freeWhenDone: YES];
/*
* If we are supposed to be doing uniquing of strings, handle it.
*/
if (uniquing == YES)
{
s = GSUnique(s);
}
/*
* If uniquing was done on serialisation, store the string for
* later reference.
*/
if (info->didUnique)
{
GSIArrayAddItem(&info->array, (GSIArrayItem)((id)s));
}
GS_CONSUMED(s)
return s;
}
case ST_STRING:
{
NSString *s;
unichar *b;
size = (*info->deiImp)(info->data, deiSel, info->cursor);
b = NSZoneMalloc(NSDefaultMallocZone(), size*sizeof(unichar));
(*info->debImp)(info->data, debSel, b, size*sizeof(unichar),
info->cursor);
s = [[StringClass alloc] initWithBytesNoCopy: b
length: size*sizeof(unichar)
encoding: NSUnicodeStringEncoding
freeWhenDone: YES];
/*
* If we are supposed to be doing uniquing of strings, handle it.
*/
if (uniquing == YES)
{
s = GSUnique(s);
}
/*
* If uniquing was done on serialisation, store the string for
* later reference.
*/
if (info->didUnique)
{
GSIArrayAddItem(&info->array, (GSIArrayItem)((id)s));
}
GS_CONSUMED(s)
return s;
}
case ST_ARRAY:
case ST_MARRAY:
size = (*info->deiImp)(info->data, deiSel, info->cursor);
{
id a;
a = NSAllocateObject(MACls, 0, NSDefaultMallocZone());
a = (*maInitImp)(a, maInitSel, size);
if (a != nil)
{
unsigned i;
for (i = 0; i < size; i++)
{
id o = deserializeFromInfo(info);
if (o == nil)
{
RELEASE(a);
return nil;
}
(*maAddImp)(a, maAddSel, o);
RELEASE(o);
}
if (code != ST_MARRAY && info->mutable == NO)
{
a = GS_IMMUTABLE(a);
}
}
return a;
}
case ST_DICT:
case ST_MDICT:
size = (*info->deiImp)(info->data, deiSel, info->cursor);
{
id d;
d = NSAllocateObject(MDCls, 0, NSDefaultMallocZone());
d = (*mdInitImp)(d, mdInitSel, size);
if (d != nil)
{
unsigned int i;
for (i = 0; i < size; i++)
{
id k = deserializeFromInfo(info);
if (k == nil)
{
RELEASE(d);
return nil;
}
else
{
id o = deserializeFromInfo(info);
if (o == nil)
{
RELEASE(k);
RELEASE(d);
return nil;
}
else
{
(*mdSetImp)(d, mdSetSel, o, k);
/*
* Since a dictionary copies its keys rather
* than retaining them, we must autorelease
* rather than simply releasing as the key may
* be referred to by a cross-reference later.
*/
IF_NO_GC(AUTORELEASE(k);)
RELEASE(o);
}
}
}
if (code != ST_MDICT && info->mutable == NO)
{
d = GS_IMMUTABLE(d);
}
}
return d;
}
case ST_DATA:
{
NSData *d;
size = (*info->deiImp)(info->data, deiSel, info->cursor);
d = (NSData*)NSAllocateObject(DCls, 0, NSDefaultMallocZone());
if (size > 0)
{
void *b = NSZoneMalloc(NSDefaultMallocZone(), size);
(*info->debImp)(info->data, debSel, b, size, info->cursor);
d = (*dInitImp)(d, dInitSel, b, size);
}
else
{
d = (*dInitImp)(d, dInitSel, 0, 0);
}
return d;
}
case ST_DATE:
{
NSTimeInterval ti;
[info->data deserializeDataAt: &ti
ofObjCType: @encode(NSTimeInterval)
atCursor: info->cursor
context: nil];
return [[NSDate alloc] initWithTimeIntervalSinceReferenceDate: ti];
}
case ST_NUMBER:
{
double d;
[info->data deserializeDataAt: &d
ofObjCType: @encode(double)
atCursor: info->cursor
context: nil];
return [[NSNumber alloc] initWithDouble: d];
}
default:
break;
}
return nil;
}
@interface _NSDeserializerProxy : NSProxy
{
_NSDeserializerInfo info;
id plist;
}
+ (_NSDeserializerProxy*) proxyWithData: (NSData*)d
atCursor: (unsigned int*)c
mutable: (BOOL)m;
@end
@implementation _NSDeserializerProxy
+ (_NSDeserializerProxy*) proxyWithData: (NSData*)d
atCursor: (unsigned int*)c
mutable: (BOOL)m
{
_NSDeserializerProxy *proxy;
proxy = (_NSDeserializerProxy*)NSAllocateObject(self,0,NSDefaultMallocZone());
if (initDeserializerInfo(&proxy->info, RETAIN(d), c, m) == YES)
{
return AUTORELEASE(proxy);
}
else
{
DESTROY(proxy);
return nil;
}
}
- (void) dealloc
{
RELEASE(info.data);
endDeserializerInfo(&info);
RELEASE(plist);
[super dealloc];
}
- (BOOL) isEqual: (id)other
{
if (other == self)
return YES;
else
return [[self self] isEqual: other];
}
- (id) self
{
if (plist == nil && info.data != nil)
{
plist = deserializeFromInfo(&info);
RELEASE(info.data);
info.data = nil;
}
return plist;
}
@end
@implementation NSDeserializer
+ (void) initialize
{
if (self == [NSDeserializer class])
{
debSel = @selector(deserializeBytes:length:atCursor:);
deiSel = @selector(deserializeIntAtCursor:);
dInitSel = @selector(initWithBytesNoCopy:length:);
maInitSel = @selector(initWithCapacity:);
mdInitSel = @selector(initWithCapacity:);
maAddSel = @selector(addObject:);
mdSetSel = @selector(setObject:forKey:);
MACls = [GSMutableArray class];
DCls = [NSDataMalloc class];
MDCls = [GSMutableDictionary class];
dInitImp = [DCls instanceMethodForSelector: dInitSel];
maInitImp = [MACls instanceMethodForSelector: maInitSel];
mdInitImp = [MDCls instanceMethodForSelector: mdInitSel];
maAddImp = [MACls instanceMethodForSelector: maAddSel];
mdSetImp = [MDCls instanceMethodForSelector: mdSetSel];
StringClass = [NSString class];
}
}
/**
* <p>Deserializes the property list stored in data at the offset specified
* by the value pointed to by cursor. Upon completion the value in cursor
* is updated to refer to a position immediately after the end of the
* deserialized sequence.
* </p>
* <p>The flag is used to specify whether container objects in the
* deserialized list should be instances of mutable or immutable classes.
* </p>
*/
+ (id) deserializePropertyListFromData: (NSData*)data
atCursor: (unsigned int*)cursor
mutableContainers: (BOOL)flag
{
_NSDeserializerInfo info;
id o;
if (data == nil || [data isKindOfClass: [NSData class]] == NO)
{
return nil;
}
NSAssert(cursor != 0, NSInvalidArgumentException);
if (initDeserializerInfo(&info, data, cursor, flag) == YES)
{
o = deserializeFromInfo(&info);
endDeserializerInfo(&info);
return AUTORELEASE(o);
}
else
{
return nil;
}
}
/**
* <p>Deserializes the property list stored in data to produce a single
* property list object (dictionary, array, string, data, number or date).
* </p>
* <p>The flag is used to specify whether container objects in the
* deserialized list should be instances of mutable or immutable classes.
* </p>
*/
+ (id) deserializePropertyListFromData: (NSData*)data
mutableContainers: (BOOL)flag
{
_NSDeserializerInfo info;
unsigned int cursor = 0;
id o;
if (data == nil || [data isKindOfClass: [NSData class]] == NO)
{
return nil;
}
if (initDeserializerInfo(&info, data, &cursor, flag) == YES)
{
o = deserializeFromInfo(&info);
endDeserializerInfo(&info);
return AUTORELEASE(o);
}
else
{
return nil;
}
}
/**
* <p>Deserializes the property list stored in data at the offset specified
* by the value pointed to by cursor. Upon completion the value in cursor
* is updated to refer to a position immediately after the end of the
* deserialized sequence.
* </p>
* <p>The flag is used to specify whether container objects in the
* deserialized list should be instances of mutable or immutable classes.
* </p>
* <p>The length is used to determine whether lazy deserialization is done,
* if the data is longer than this value, a proxy is returned rather than
* the actual property list, and the real deserialization can be done
* later.
* </p>
*/
+ (id) deserializePropertyListLazilyFromData: (NSData*)data
atCursor: (unsigned*)cursor
length: (unsigned)length
mutableContainers: (BOOL)flag
{
if (data == nil || [data isKindOfClass: [NSData class]] == NO)
{
return nil;
}
NSAssert(cursor != 0, NSInvalidArgumentException);
if (length > [data length] - *cursor)
{
_NSDeserializerInfo info;
id o;
if (initDeserializerInfo(&info, data, cursor, flag) == YES)
{
o = deserializeFromInfo(&info);
endDeserializerInfo(&info);
return AUTORELEASE(o);
}
else
{
return nil;
}
}
else
{
return [_NSDeserializerProxy proxyWithData: data
atCursor: cursor
mutable: flag];
}
}
@end
@implementation NSDeserializer (GNUstep)
/**
* This method turns on/off uniquing of strings as they are
* deserialized from data objects. The uniquing mechanism
* employs the GNUstep-specific functions documented with
* the NSCountedSet class.
*/
+ (void) uniquing: (BOOL)flag
{
if (flag == YES)
GSUniquing(YES);
uniquing = flag;
}
@end