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libs-base/Source/NSUnarchiver.m
Frederik Seiffert 80b54d580d Removed unecessary casts
2025-03-19 08:39:42 +08:00

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/** Implementation of NSUnarchiver for GNUstep
Copyright (C) 1998 Free Software Foundation, Inc.
Written by: Richard Frith-Macdonald <rfm@gnu.org>
Created: October 1998
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., 31 Milk Street #960789 Boston, MA 02196 USA.
<title>NSUnarchiver class reference</title>
$Date$ $Revision$
*/
#import "common.h"
#if !defined (__GNU_LIBOBJC__)
# include <objc/encoding.h>
#endif
#define EXPOSE_NSUnarchiver_IVARS 1
#import "Foundation/NSDictionary.h"
#import "Foundation/NSException.h"
#import "Foundation/NSByteOrder.h"
/*
* Setup for inline operation of arrays.
*/
#define GSI_ARRAY_NO_RETAIN 1
#define GSI_ARRAY_NO_RELEASE 1
#define GSI_ARRAY_TYPES GSUNION_OBJ|GSUNION_SEL|GSUNION_PTR
#include "GNUstepBase/GSIArray.h"
#define _IN_NSUNARCHIVER_M
#import "Foundation/NSArchiver.h"
#undef _IN_NSUNARCHIVER_M
#import "Foundation/NSAutoreleasePool.h"
#import "Foundation/NSCoder.h"
#import "Foundation/NSData.h"
#import "Foundation/NSArray.h"
@class NSDataMalloc;
@interface NSDataMalloc : NSObject // Help the compiler
@end
static const char*
typeToName1(char type)
{
switch (type)
{
case _C_CLASS: return "class";
case _C_ID: return "object";
case _C_SEL: return "selector";
case _C_CHR: return "char";
case _C_UCHR: return "unsigned char";
case _C_SHT: return "short";
case _C_USHT: return "unsigned short";
case _C_INT: return "int";
case _C_UINT: return "unsigned int";
case _C_LNG: return "long";
case _C_ULNG: return "unsigned long";
case _C_LNG_LNG: return "long long";
case _C_ULNG_LNG: return "unsigned long long";
case _C_FLT: return "float";
case _C_DBL: return "double";
#if defined(_C_BOOL) && (!defined(__GNUC__) || __GNUC__ > 2)
case _C_BOOL: return "_Bool";
#endif
case _C_PTR: return "pointer";
case _C_CHARPTR: return "cstring";
case _C_ARY_B: return "array";
case _C_STRUCT_B: return "struct";
default:
{
static char buf1[32];
static char buf2[32];
static char *bufptr = buf1;
if (bufptr == buf1)
{
bufptr = buf2;
}
else
{
bufptr = buf1;
}
snprintf(bufptr, 32, "unknown type info - 0x%x", type);
return bufptr;
}
}
}
static const char*
typeToName2(char type)
{
switch (type & _GSC_MASK)
{
case _GSC_CID: return "class (encoded as id)";
case _GSC_CLASS: return "class";
case _GSC_ID: return "object";
case _GSC_SEL: return "selector";
case _GSC_CHR: return "char";
case _GSC_UCHR: return "unsigned char";
case _GSC_SHT: return "short";
case _GSC_USHT: return "unsigned short";
case _GSC_INT: return "int";
case _GSC_UINT: return "unsigned int";
case _GSC_LNG: return "long";
case _GSC_ULNG: return "unsigned long";
case _GSC_LNG_LNG: return "long long";
case _GSC_ULNG_LNG: return "unsigned long long";
case _GSC_FLT: return "float";
case _GSC_DBL: return "double";
case _GSC_BOOL: return "_Bool";
case _GSC_PTR: return "pointer";
case _GSC_CHARPTR: return "cstring";
case _GSC_ARY_B: return "array";
case _GSC_STRUCT_B: return "struct";
default:
{
static char buf1[32];
static char buf2[32];
static char *bufptr = buf1;
if (bufptr == buf1)
{
bufptr = buf2;
}
else
{
bufptr = buf1;
}
snprintf(bufptr, 32, "unknown type info - 0x%x", type);
return bufptr;
}
}
}
/*
* There are thirtyone possible basic types. We reserve a type of zero
* to mean that no information is specified. The slots in this array
* MUST correspond to the definitions in NSData.h
*/
static char type_map[32] = {
0,
_C_CHR,
_C_UCHR,
_C_SHT,
_C_USHT,
_C_INT,
_C_UINT,
_C_LNG,
_C_ULNG,
_C_LNG_LNG,
_C_ULNG_LNG,
_C_FLT,
_C_DBL,
#if defined(_C_BOOL) && (!defined(__GNUC__) || __GNUC__ > 2)
_C_BOOL,
#else
0,
#endif
0,
0,
_C_ID,
_C_CLASS,
_C_SEL,
_C_PTR,
_C_CHARPTR,
_C_ARY_B,
_C_STRUCT_B,
0,
0,
0,
0,
0,
0,
0,
0,
0
};
static inline BOOL
typeCheck(char t1, char t2)
{
if (type_map[(t2 & _GSC_MASK)] != t1)
{
/*
* HACK ... allow int/long/longlong types to be used interchangably
* as the ObjC compiler currently uses quadword (q/Q) encoding for
* integer types on some 64bit systems, so the i/l/q/I/L/Q encodings
* can vary.
*/
char c = type_map[(t2 & _GSC_MASK)];
char s1;
char s2;
switch (t1)
{
case _C_SHT: s1 = _GSC_S_SHT; break;
case _C_USHT: s1 = _GSC_S_SHT; break;
case _C_INT: s1 = _GSC_S_INT; break;
case _C_UINT: s1 = _GSC_S_INT; break;
case _C_LNG: s1 = _GSC_S_LNG; break;
case _C_ULNG: s1 = _GSC_S_LNG; break;
case _C_LNG_LNG: s1 = _GSC_S_LNG_LNG; break;
case _C_ULNG_LNG: s1 = _GSC_S_LNG_LNG; break;
default: s1 = 0;
}
switch (t2)
{
case _C_SHT: s2 = _GSC_S_SHT; break;
case _C_USHT: s2 = _GSC_S_SHT; break;
case _C_INT: s2 = _GSC_S_INT; break;
case _C_UINT: s2 = _GSC_S_INT; break;
case _C_LNG: s2 = _GSC_S_LNG; break;
case _C_ULNG: s2 = _GSC_S_LNG; break;
case _C_LNG_LNG: s2 = _GSC_S_LNG_LNG; break;
case _C_ULNG_LNG: s2 = _GSC_S_LNG_LNG; break;
default: s2 = 0;
}
if ((c == _C_INT || c == _C_LNG || c == _C_LNG_LNG)
&& (t1 == _C_INT || t1 == _C_LNG || t1 == _C_LNG_LNG))
return s1 == s2 ? YES : NO;
if ((c == _C_UINT || c == _C_ULNG || c == _C_ULNG_LNG)
&& (t1 == _C_UINT || t1 == _C_ULNG || t1 == _C_ULNG_LNG))
return s1 == s2 ? YES : NO;
/* HACK also allow float and double to be used interchangably as MacOS-X
* intorduced CGFloat, which may be aither a float or a double.
*/
if ((c == _C_FLT || c == _C_DBL) && (t1 == _C_FLT || t1 == _C_DBL))
return NO;
[NSException raise: NSInternalInconsistencyException
format: @"expected %s and got %s",
typeToName1(t1), typeToName2(t2)];
}
return YES;
}
#define PREFIX "GNUstep archive"
static SEL desSel;
static SEL tagSel;
static SEL dValSel;
@interface NSUnarchiverClassInfo : NSObject
{
@public
NSString *original;
NSString *name;
Class class;
}
+ (id) newWithName: (NSString*)n;
- (void) mapToClass: (Class)c withName: (NSString*)name;
@end
@implementation NSUnarchiverClassInfo
+ (id) newWithName: (NSString*)n
{
NSUnarchiverClassInfo *info;
info = (NSUnarchiverClassInfo*)NSAllocateObject(self,0,NSDefaultMallocZone());
if (info)
{
info->original = [n copyWithZone: NSDefaultMallocZone()];
}
return info;
}
- (void) dealloc
{
RELEASE(original);
if (name)
{
RELEASE(name);
}
NSDeallocateObject(self);
GSNOSUPERDEALLOC;
}
- (void) mapToClass: (Class)c withName: (NSString*)n
{
ASSIGN(name, n);
class = c;
}
@end
/*
* Dictionary used by NSUnarchiver class to keep track of
* NSUnarchiverClassInfo objects used to map classes by name when
* unarchiving.
*/
static NSMutableDictionary *clsDict; /* Class information */
@interface NSUnarchiverObjectInfo : NSUnarchiverClassInfo
{
@public
NSInteger version;
NSUnarchiverClassInfo *overrides;
}
@end
static inline Class
mapClassObject(NSUnarchiverObjectInfo *info)
{
if (info->overrides == nil)
{
info->overrides = [clsDict objectForKey: info->original];
}
if (info->overrides)
{
return info->overrides->class;
}
else
{
return info->class;
}
}
static inline NSString*
mapClassName(NSUnarchiverObjectInfo *info)
{
if (info->overrides == nil)
{
info->overrides = [clsDict objectForKey: info->original];
}
if (info->overrides)
{
return info->overrides->name;
}
else
{
return info->name;
}
}
@implementation NSUnarchiverObjectInfo
@end
/**
* <p>This class reconstructs objects from an archive.</p><br />
* <strong>Re-using the archiver</strong>
* <p>
* The -resetUnarchiverWithData:atIndex: method lets you re-use
* the archive to decode a new data object or, in conjunction
* with the 'cursor' method (which reports the current decoding
* position in the archive), decode a second archive that exists
* in the data object after the first one.
* </p>
* <strong>Subclassing with different input format.</strong><br /><br />
* <code>NSUnarchiver</code> normally reads directly from an [NSData]
* object using the methods -
* <deflist>
* <term>-deserializeTypeTag:andCrossRef:atCursor:</term>
* <desc>
* to decode type tags for data items, the tag is the
* first byte of the character encoding string for the
* data type (as provided by '@encode(xxx)'), possibly
* with the top bit set to indicate that what follows is
* a crossreference to an item already encoded.<br />
* Also decode a crossreference number either to identify the
* following item, or to refer to a previously encoded item.
* Objects, Classes, Selectors, CStrings and Pointer items
* have crossreference encoding, other types do not.<br />
* </desc>
* <term>[NSData-deserializeDataAt:ofObjCType:atCursor:context:]</term>
* <desc>
* to decode all other information.
* </desc>
* </deflist>
* <p>
* <code>NSUnarchiver</code> normally uses other [NSData] methods to read
* the archive header information from within the method:
* [-deserializeHeaderAt:version:classes:objects:pointers:]
* to read a fixed size header including archiver version
* (obtained by <code>[self systemVersion]</code>) and crossreference
* table sizes.
* </p>
* <p>
* To subclass <code>NSUnarchiver</code>, you must implement your own
* versions of the four methods above, and override the 'directDataAccess'
* method to return NO so that the archiver knows to use your serialization
* methods rather than those in the [NSData] object.
* </p>
*/
@implementation NSUnarchiver
static Class NSDataMallocClass;
static unsigned encodingVersion;
+ (void) initialize
{
if ([self class] == [NSUnarchiver class])
{
NSArchiver *archiver = [NSArchiver new];
encodingVersion = [archiver systemVersion];
[archiver release];
desSel = @selector(deserializeDataAt:ofObjCType:atCursor:context:);
tagSel = @selector(deserializeTypeTag:andCrossRef:atCursor:);
dValSel = @selector(decodeValueOfObjCType:at:);
clsDict = [[NSMutableDictionary alloc] initWithCapacity: 200];
NSDataMallocClass = [NSDataMalloc class];
}
}
/**
* Creates an NSUnarchiver to read from anObject and returns result of sending
* [NSCoder -decodeObject] to it.
*/
+ (id) unarchiveObjectWithData: (NSData*)anObject
{
NSUnarchiver *unarchiver;
id obj;
unarchiver = [[self alloc] initForReadingWithData: anObject];
NS_DURING
{
obj = [unarchiver decodeObject];
}
NS_HANDLER
{
obj = nil;
RELEASE(unarchiver);
[localException raise];
}
NS_ENDHANDLER
RELEASE(unarchiver);
return obj;
}
/**
* Creates an NSUnarchiver to read from path and returns result of sending
* [NSCoder -decodeObject] to it.
*/
+ (id) unarchiveObjectWithFile: (NSString*)path
{
NSData *d = [NSDataMallocClass dataWithContentsOfFile: path];
if (d != nil)
{
return [self unarchiveObjectWithData: d];
}
return nil;
}
- (void) dealloc
{
RELEASE(data);
RELEASE(objSave);
RELEASE(objDict);
if (clsMap)
{
NSZone *z = clsMap->zone;
GSIArrayClear(clsMap);
GSIArrayClear(objMap);
GSIArrayClear(ptrMap);
NSZoneFree(z, (void*)clsMap);
}
[super dealloc];
}
/**
* Set up to read objects from data buffer anObject.
*/
- (id) initForReadingWithData: (NSData*)anObject
{
if (anObject == nil)
{
RELEASE(self);
[NSException raise: NSInvalidArgumentException
format: @"nil data passed to initForReadingWithData:"];
}
self = [super init];
if (self)
{
dValImp = [self methodForSelector: dValSel];
zone = [self zone];
/*
* If we are not deserializing directly from the data object
* then we cache our own deserialisation methods.
*/
if ([self directDataAccess] == NO)
{
src = self; /* Default object to handle serialisation */
desImp = [src methodForSelector: desSel];
tagImp = (void (*)(id, SEL, unsigned char*, unsigned*, unsigned*))
[src methodForSelector: tagSel];
}
/*
* objDict is a dictionary of objects for mapping classes of
* one name to be those of another name! It also handles
* keeping track of the version numbers that the classes were
* encoded with.
*/
objDict = [[NSMutableDictionary allocWithZone: zone]
initWithCapacity: 200];
/*
* objSave is an array used purely to ensure that objects
* we decode persist until the end of the decoding.
*/
objSave = [[NSMutableArray allocWithZone: zone]
initWithCapacity: 200];
NS_DURING
{
[self resetUnarchiverWithData: anObject atIndex: 0];
}
NS_HANDLER
{
DESTROY(self);
[localException raise];
}
NS_ENDHANDLER
}
return self;
}
- (void) decodeArrayOfObjCType: (const char*)type
count: (NSUInteger)expected
at: (void*)buf
{
NSUInteger i;
NSUInteger offset = 0;
unsigned int size = (unsigned int)objc_sizeof_type(type);
unsigned char info;
unsigned char ainfo;
unsigned char amask;
NSUInteger count;
(*tagImp)(src, tagSel, &info, 0, &cursor);
if ([self systemVersion] == 12402)
{
uint8_t c;
/* Unpack variable length count.
*/
count = 0;
for (;;)
{
if (count * 128 < count)
{
[NSException raise: NSInternalInconsistencyException
format: @"overflow in array count"];
}
count *= 128;
(*desImp)(src, desSel, &c, @encode(uint8_t), &cursor, nil);
if (c & 128)
{
count += (c & 127);
}
else
{
count += c;
break;
}
}
}
else
{
uint32_t c;
(*desImp)(src, desSel, &c, @encode(uint32_t), &cursor, nil);
count = c;
if (0xffffffff == c)
{
(*desImp)(src, desSel, &count, @encode(NSUInteger), &cursor, nil);
}
}
if (info != _GSC_ARY_B)
{
[NSException raise: NSInternalInconsistencyException
format: @"expected array and got %s", typeToName2(info)];
}
if (count != expected)
{
[NSException raise: NSInternalInconsistencyException
format: @"expected array count %"PRIuPTR" and got %"PRIuPTR"",
expected, count];
}
switch (*type)
{
case _C_ID: info = _GSC_NONE; break;
case _C_CHR: info = _GSC_CHR; break;
case _C_UCHR: info = _GSC_UCHR; break;
case _C_SHT: info = _GSC_SHT; break;
case _C_USHT: info = _GSC_USHT; break;
case _C_INT: info = _GSC_INT; break;
case _C_UINT: info = _GSC_UINT; break;
case _C_LNG: info = _GSC_LNG; break;
case _C_ULNG: info = _GSC_ULNG; break;
case _C_LNG_LNG: info = _GSC_LNG_LNG; break;
case _C_ULNG_LNG: info = _GSC_ULNG_LNG; break;
case _C_FLT: info = _GSC_FLT; break;
case _C_DBL: info = _GSC_DBL; break;
#if defined(_C_BOOL) && (!defined(__GNUC__) || __GNUC__ > 2)
case _C_BOOL: info = _GSC_BOOL; break;
#endif
default: info = _GSC_NONE; break;
}
if (info == _GSC_NONE)
{
for (i = 0; i < count; i++)
{
(*dValImp)(self, dValSel, type, (char*)buf + offset);
offset += size;
}
return;
}
(*tagImp)(src, tagSel, &ainfo, 0, &cursor);
amask = (ainfo & _GSC_MASK);
/* If we have a perfect type match or we are coding a class as an ID,
* we can just decode the array simply.
*/
if (info == amask)
{
for (i = 0; i < count; i++)
{
(*desImp)(src, desSel, (char*)buf + offset, type, &cursor, nil);
offset += size;
}
return;
}
/* This will raise an exception if the types don't match at all.
*/
typeCheck(*type, ainfo);
/* We fall through to here only when we have to decode a value
* whose natural size on this system is not the same as on the
* machine on which the archive was created.
*/
if (*type == _C_FLT)
{
for (i = 0; i < count; i++)
{
double d;
(*desImp)(src, desSel, &d, @encode(double), &cursor, nil);
*(float*)(buf + offset) = (float)d;
offset += size;
}
}
else if (*type == _C_DBL)
{
for (i = 0; i < count; i++)
{
float f;
(*desImp)(src, desSel, &f, @encode(float), &cursor, nil);
*(double*)(buf + offset) = (double)f;
offset += size;
}
}
else if (*type == _C_SHT
|| *type == _C_INT
|| *type == _C_LNG
|| *type == _C_LNG_LNG)
{
int64_t big;
int64_t max;
int64_t min;
switch (size)
{
case 1:
max = INT8_MAX;
min = INT8_MIN;
break;
case 2:
max = INT16_MAX;
min = INT16_MAX;
break;
case 4:
max = INT32_MAX;
min = INT32_MIN;
break;
default:
max = INT64_MAX;
min = INT64_MIN;
}
for (i = 0; i < count; i++)
{
void *address = (void*)buf + offset;
switch (ainfo & _GSC_SIZE)
{
case _GSC_I16: /* Encoded as 16-bit */
{
int16_t val;
(*desImp)(src, desSel, &val, @encode(int16_t), &cursor, nil);
big = val;
break;
}
case _GSC_I32: /* Encoded as 32-bit */
{
int32_t val;
(*desImp)(src, desSel, &val, @encode(int32_t), &cursor, nil);
big = val;
break;
}
case _GSC_I64: /* Encoded as 64-bit */
{
(*desImp)(src, desSel, &big, @encode(int64_t), &cursor, nil);
break;
}
default:
[NSException raise: NSGenericException
format: @"invalid size in archive"];
}
/*
* Now we copy from the big value to the destination location.
*/
switch (size)
{
case 1:
*(int8_t*)address = (int8_t)big;
break;
case 2:
*(int16_t*)address = (int16_t)big;
break;
case 4:
*(int32_t*)address = (int32_t)big;
break;
default:
*(int64_t*)address = big;
}
if (big < min || big > max)
{
NSLog(@"Lost information converting large decoded value");
}
offset += size;
}
}
else
{
uint64_t big;
uint64_t max;
switch (size)
{
case 1:
max = UINT8_MAX;
break;
case 2:
max = UINT16_MAX;
break;
case 4:
max = UINT32_MAX;
break;
default:
max = UINT64_MAX;
}
for (i = 0; i < count; i++)
{
void *address = (void*)buf + offset;
switch (info & _GSC_SIZE)
{
case _GSC_I16: /* Encoded as 16-bit */
{
uint16_t val;
(*desImp)(src, desSel, &val, @encode(uint16_t), &cursor, nil);
big = val;
break;
}
case _GSC_I32: /* Encoded as 32-bit */
{
uint32_t val;
(*desImp)(src, desSel, &val, @encode(uint32_t), &cursor, nil);
big = val;
break;
}
case _GSC_I64: /* Encoded as 64-bit */
{
(*desImp)(src, desSel, &big, @encode(uint64_t), &cursor, nil);
break;
}
default:
[NSException raise: NSGenericException
format: @"invalid size in archive"];
}
/*
* Now we copy from the big value to the destination location.
*/
switch (size)
{
case 1:
*(uint8_t*)address = (uint8_t)big;
break;
case 2:
*(uint16_t*)address = (uint16_t)big;
break;
case 4:
*(uint32_t*)address = (uint32_t)big;
break;
case 8:
*(uint64_t*)address = big;
}
if (big > max)
{
NSLog(@"Lost information converting large decoded value");
}
offset += size;
}
}
}
static inline int
scalarSize(char type)
{
switch (type)
{
case _C_SHT:
case _C_USHT: return _GSC_S_SHT;
case _C_INT:
case _C_UINT: return _GSC_S_INT;
case _C_LNG:
case _C_ULNG: return _GSC_S_LNG;
case _C_LNG_LNG:
case _C_ULNG_LNG: return _GSC_S_LNG_LNG;
default:
[NSException raise: NSInvalidArgumentException
format: @"scalarSize() called with non-scalar type"];
}
return -1;
}
- (void) decodeValueOfObjCType: (const char*)type
at: (void*)address
{
unsigned xref;
unsigned char info;
(*tagImp)(src, tagSel, &info, &xref, &cursor);
switch (info & _GSC_MASK)
{
case _GSC_ID:
{
id obj;
typeCheck(*type, _GSC_ID);
/*
* Special case - a zero crossref value size is a nil pointer.
*/
if ((info & _GSC_SIZE) == 0)
{
obj = nil;
}
else
{
if (info & _GSC_XREF)
{
if (xref >= GSIArrayCount(objMap))
{
[NSException raise: NSInternalInconsistencyException
format: @"object crossref missing - %d",
xref];
}
obj = GSIArrayItemAtIndex(objMap, xref).obj;
/*
* If it's a cross-reference, we need to retain it in
* order to give the appearance that it's actually a
* new object.
*/
IF_NO_ARC(RETAIN(obj);)
}
else
{
Class c;
id rep;
if (xref != GSIArrayCount(objMap))
{
[NSException raise: NSInternalInconsistencyException
format: @"extra object crossref - %d",
xref];
}
(*dValImp)(self, dValSel, @encode(Class), &c);
if (c == 0)
{
[NSException raise: NSInternalInconsistencyException
format: @"decoded nil class"];
}
obj = [c allocWithZone: zone];
GSIArrayAddItem(objMap, (GSIArrayItem)obj);
rep = [obj initWithCoder: self];
if (rep != obj)
{
obj = rep;
GSIArraySetItemAtIndex(objMap, (GSIArrayItem)obj, xref);
}
rep = [obj awakeAfterUsingCoder: self];
if (rep != obj)
{
obj = rep;
GSIArraySetItemAtIndex(objMap, (GSIArrayItem)obj, xref);
}
/*
* The objMap does not retain objects, so in order to
* be sure that a decoded object is not deallocated by
* anything before it is needed (because it is decoded
* later as a cross reference) we store it in objSave.
*/
if (obj != nil)
{
[objSave addObject: obj];
}
}
}
*(id*)address = obj;
return;
}
case _GSC_CLASS:
{
Class c;
NSUnarchiverObjectInfo *classInfo;
Class dummy;
if (*type != _C_ID)
{
typeCheck(*type, _GSC_CLASS);
}
/*
* Special case - a zero crossref value size is a nil pointer.
*/
if ((info & _GSC_SIZE) == 0)
{
*(SEL*)address = 0;
return;
}
if (info & _GSC_XREF)
{
if (xref >= GSIArrayCount(clsMap))
{
[NSException raise: NSInternalInconsistencyException
format: @"class crossref missing - %d", xref];
}
classInfo = (NSUnarchiverObjectInfo*)
GSIArrayItemAtIndex(clsMap, xref).obj;
*(Class*)address = mapClassObject(classInfo);
return;
}
while ((info & _GSC_MASK) == _GSC_CLASS)
{
unsigned cver;
NSString *className;
uint16_t nameLength;
if (xref != GSIArrayCount(clsMap))
{
[NSException raise: NSInternalInconsistencyException
format: @"extra class crossref - %d", xref];
}
/*
* A class is encoded as a 16-bit length, a sequence of
* characters providing its name, then a version number.
*/
(*desImp)(src, desSel, &nameLength, @encode(uint16_t),
&cursor, nil);
if (nameLength == 0)
{
className = nil;
}
else
{
char name[nameLength+1];
[src deserializeBytes: name
length: nameLength
atCursor: &cursor];
name[nameLength] = '\0';
className = [[NSString alloc] initWithUTF8String: name];
}
(*desImp)(src, desSel, &cver, @encode(unsigned), &cursor, nil);
if (className == 0)
{
NSLog(@"[%s %s] decoded nil class name",
class_getName([self class]), sel_getName(_cmd));
className = @"_NSUnarchiverUnknownClass";
}
classInfo = [objDict objectForKey: className];
if (nil == classInfo)
{
classInfo = [NSUnarchiverObjectInfo newWithName: className];
c = NSClassFromString(className);
/*
* Show a warning, if the class name that's being used to
* build the class causes NSClassFromString to return nil.
* This means that the class is unknown to the runtime.
*/
if (c == nil)
{
NSLog(@"Unable to find class named '%@'", className);
}
[classInfo mapToClass: c withName: className];
[objDict setObject: classInfo forKey: className];
RELEASE(classInfo);
}
RELEASE(className);
classInfo->version = (NSInteger)cver;
GSIArrayAddItem(clsMap, (GSIArrayItem)((id)classInfo));
*(Class*)address = mapClassObject(classInfo);
/*
* Point the address to a dummy location and read the
* next tag - if it is another class, loop to get it.
*/
address = &dummy;
(*tagImp)(src, tagSel, &info, &xref, &cursor);
}
if (info != _GSC_NONE)
{
[NSException raise: NSInternalInconsistencyException
format: @"class list improperly terminated"];
}
return;
}
case _GSC_SEL:
{
SEL sel;
typeCheck(*type, _GSC_SEL);
/*
* Special case - a zero crossref value size is a nil pointer.
*/
if ((info & _GSC_SIZE) == 0)
{
*(SEL*)address = 0;
return;
}
if (info & _GSC_XREF)
{
if (xref >= GSIArrayCount(ptrMap))
{
[NSException raise: NSInternalInconsistencyException
format: @"sel crossref missing - %d", xref];
}
sel = GSIArrayItemAtIndex(ptrMap, xref).sel;
}
else
{
if (xref != GSIArrayCount(ptrMap))
{
[NSException raise: NSInternalInconsistencyException
format: @"extra sel crossref - %d", xref];
}
(*desImp)(src, desSel, &sel, @encode(SEL), &cursor, nil);
GSIArrayAddItem(ptrMap, (GSIArrayItem)sel);
}
*(SEL*)address = sel;
return;
}
case _GSC_ARY_B:
{
int count;
typeCheck(*type, _GSC_ARY_B);
count = atoi(++type);
while (isdigit(*type))
{
type++;
}
[self decodeArrayOfObjCType: type count: count at: address];
return;
}
case _GSC_STRUCT_B:
{
struct objc_struct_layout layout;
typeCheck(*type, _GSC_STRUCT_B);
objc_layout_structure (type, &layout);
while (objc_layout_structure_next_member (&layout))
{
unsigned offset;
unsigned align;
const char *ftype;
objc_layout_structure_get_info (&layout, &offset, &align, &ftype);
(*dValImp)(self, dValSel, ftype, (char*)address + offset);
}
return;
}
case _GSC_PTR:
{
typeCheck(*type, _GSC_PTR);
/*
* Special case - a zero crossref value size is a nil pointer.
*/
if ((info & _GSC_SIZE) == 0)
{
*(void**)address = 0;
return;
}
if (info & _GSC_XREF)
{
if (xref >= GSIArrayCount(ptrMap))
{
[NSException raise: NSInternalInconsistencyException
format: @"ptr crossref missing - %d", xref];
}
*(void**)address = GSIArrayItemAtIndex(ptrMap, xref).ptr;
}
else
{
unsigned size;
if (GSIArrayCount(ptrMap) != xref)
{
[NSException raise: NSInternalInconsistencyException
format: @"extra ptr crossref - %d", xref];
}
/*
* Allocate memory for object to be decoded into and
* add it to the crossref map.
*/
size = objc_sizeof_type(++type);
*(void**)address = GSAutoreleasedBuffer(size);
GSIArrayAddItem(ptrMap, (GSIArrayItem)*(void**)address);
/*
* Decode value and add memory to map for crossrefs.
*/
(*dValImp)(self, dValSel, type, *(void**)address);
}
return;
}
case _GSC_CHARPTR:
{
typeCheck(*type, _GSC_CHARPTR);
/*
* Special case - a zero crossref value size is a nil pointer.
*/
if ((info & _GSC_SIZE) == 0)
{
*(char**)address = 0;
return;
}
if (info & _GSC_XREF)
{
if (xref >= GSIArrayCount(ptrMap))
{
[NSException raise: NSInternalInconsistencyException
format: @"string crossref missing - %d", xref];
}
*(char**)address = GSIArrayItemAtIndex(ptrMap, xref).str;
}
else
{
if (xref != GSIArrayCount(ptrMap))
{
[NSException raise: NSInternalInconsistencyException
format: @"extra string crossref - %d", xref];
}
(*desImp)(src, desSel, address, @encode(char*), &cursor, nil);
GSIArrayAddItem(ptrMap, (GSIArrayItem)*(void**)address);
}
return;
}
case _GSC_CHR:
case _GSC_UCHR:
/* Encoding of chars is not consistant across platforms, so we
loosen the type checking a little */
if (*type != type_map[_GSC_CHR] && *type != type_map[_GSC_UCHR])
{
[NSException raise: NSInternalInconsistencyException
format: @"expected %s and got %s",
typeToName1(*type), typeToName2(info)];
}
(*desImp)(src, desSel, address, type, &cursor, nil);
return;
case _GSC_SHT:
case _GSC_USHT:
if (YES == typeCheck(*type, info & _GSC_MASK)
&& (info & _GSC_SIZE) == scalarSize(*type))
{
(*desImp)(src, desSel, address, type, &cursor, nil);
return;
}
break;
case _GSC_INT:
case _GSC_UINT:
if (YES == typeCheck(*type, info & _GSC_MASK)
&& (info & _GSC_SIZE) == scalarSize(*type))
{
(*desImp)(src, desSel, address, type, &cursor, nil);
return;
}
break;
case _GSC_LNG:
case _GSC_ULNG:
if (YES == typeCheck(*type, info & _GSC_MASK)
&& (info & _GSC_SIZE) == scalarSize(*type))
{
(*desImp)(src, desSel, address, type, &cursor, nil);
return;
}
break;
case _GSC_LNG_LNG:
case _GSC_ULNG_LNG:
if (YES == typeCheck(*type, info & _GSC_MASK)
&& (info & _GSC_SIZE) == scalarSize(*type))
{
(*desImp)(src, desSel, address, type, &cursor, nil);
return;
}
break;
case _GSC_FLT:
if (YES == typeCheck(*type, _GSC_FLT)
&& *type == _C_FLT)
{
(*desImp)(src, desSel, address, type, &cursor, nil);
}
else
{
float val;
/* We found a float when expecting a double ... handle it.
*/
(*desImp)(src, desSel, &val, @encode(float), &cursor, nil);
*(double*)address = (double)val;
}
return;
case _GSC_DBL:
if (YES == typeCheck(*type, _GSC_DBL)
&& *type == _C_DBL)
{
(*desImp)(src, desSel, address, type, &cursor, nil);
}
else
{
double val;
/* We found a double when expecting a float ... handle it.
*/
(*desImp)(src, desSel, &val, @encode(double), &cursor, nil);
*(float*)address = (float)val;
}
return;
case _GSC_BOOL:
if (*type != type_map[_GSC_BOOL])
{
[NSException raise: NSInternalInconsistencyException
format: @"expected %s and got %s",
typeToName1(*type), typeToName2(info)];
}
(*desImp)(src, desSel, address, type, &cursor, nil);
return;
default:
[NSException raise: NSInternalInconsistencyException
format: @"read unknown type info - %d", info];
}
{
uint8_t size;
/*
* We fall through to here only when we have to decode a value
* whose natural size on this system is not the same as on the
* machine on which the archive was created.
*/
switch (*type)
{
case _C_SHT:
case _C_USHT: size = sizeof(short); break;
case _C_INT:
case _C_UINT: size = sizeof(int); break;
case _C_LNG:
case _C_ULNG: size = sizeof(long); break;
case _C_LNG_LNG:
case _C_ULNG_LNG: size = sizeof(long long); break;
default: size = 1;
}
/*
* First, we read the data and convert it to the largest size
* this system can support.
*/
if (*type == _C_SHT
|| *type == _C_INT
|| *type == _C_LNG
|| *type == _C_LNG_LNG)
{
int64_t big;
switch (info & _GSC_SIZE)
{
case _GSC_I16: /* Encoded as 16-bit */
{
int16_t val;
(*desImp)(src, desSel, &val, @encode(int16_t), &cursor, nil);
big = val;
break;
}
case _GSC_I32: /* Encoded as 32-bit */
{
int32_t val;
(*desImp)(src, desSel, &val, @encode(int32_t), &cursor, nil);
big = val;
break;
}
case _GSC_I64: /* Encoded as 64-bit */
{
(*desImp)(src, desSel, &big, @encode(int64_t), &cursor, nil);
break;
}
default: /* A 128-bit value */
{
big = 0;
[NSException raise: NSInternalInconsistencyException
format: @"Archiving of 128bit integer not allowed"];
}
}
/*
* Now we copy from the big value to the destination location.
*/
switch (size)
{
case 1:
*(int8_t*)address = (int8_t)big;
if (big > 127 || big < -128)
{
NSLog(@"Lost information converting decoded value to int8_t");
}
return;
case 2:
*(int16_t*)address = (int16_t)big;
if (big > 32767 || big < -32768)
{
NSLog(@"Lost information converting decoded value to int16_t");
}
return;
case 4:
*(int32_t*)address = (int32_t)big;
if (big > 2147483647 || big < -2147483648LL)
{
NSLog(@"Lost information converting decoded value to int32_t");
}
return;
case 8:
*(int64_t*)address = big;
return;
default:
[NSException raise: NSInternalInconsistencyException
format: @"type/size information error"];
}
}
else
{
uint64_t big;
switch (info & _GSC_SIZE)
{
case _GSC_I16: /* Encoded as 16-bit */
{
uint16_t val;
(*desImp)(src, desSel, &val, @encode(uint16_t), &cursor, nil);
big = val;
break;
}
case _GSC_I32: /* Encoded as 32-bit */
{
uint32_t val;
(*desImp)(src, desSel, &val, @encode(uint32_t), &cursor, nil);
big = val;
break;
}
case _GSC_I64: /* Encoded as 64-bit */
{
(*desImp)(src, desSel, &big, @encode(uint64_t), &cursor, nil);
break;
}
default: /* A 128-bit value */
{
big = 0;
[NSException raise: NSInternalInconsistencyException
format: @"Archiving of 128bit integer not allowed"];
}
}
/*
* Now we copy from the big value to the destination location.
*/
switch (size)
{
case 1:
if (big & ~0xffLL)
{
NSLog(@"Lost information converting decoded value to uint8_t");
}
*(uint8_t*)address = (uint8_t)big;
return;
case 2:
if (big & ~0xffffLL)
{
NSLog(@"Lost information converting decoded value to uint16_t");
}
*(uint16_t*)address = (uint16_t)big;
return;
case 4:
if (big & ~0xffffffffLL)
{
NSLog(@"Lost information converting decoded value to uint32_t");
}
*(uint32_t*)address = (uint32_t)big;
return;
case 8:
*(uint64_t*)address = big;
return;
default:
[NSException raise: NSInternalInconsistencyException
format: @"type/size information error"];
}
}
}
}
- (NSData*) decodeDataObject
{
unsigned l;
(*dValImp)(self, dValSel, @encode(unsigned int), &l);
if (l)
{
unsigned char c;
(*dValImp)(self, dValSel, @encode(unsigned char), &c);
if (c == 0)
{
void *b;
NSData *d;
b = NSZoneMalloc(zone, l);
[self decodeArrayOfObjCType: @encode(unsigned char)
count: l
at: b];
d = [[NSData allocWithZone: zone] initWithBytesNoCopy: b
length: l];
IF_NO_ARC(AUTORELEASE(d);)
return d;
}
else
{
[NSException raise: NSInternalInconsistencyException
format: @"Decoding data object with unknown type"];
}
}
return [NSData data];
}
/**
* Returns whether have currently read through all of data buffer or file
* this unarchiver was initialized with.
*/
- (BOOL) isAtEnd
{
return (cursor >= [data length]);
}
/**
* Returns zone unarchived objects will be allocated from.
*/
- (NSZone*) objectZone
{
return zone;
}
/**
* Sets zone unarchived objects will be allocated from.
*/
- (void) setObjectZone: (NSZone*)aZone
{
zone = aZone;
}
/**
* Returns system version archive was encoded by.
*/
- (unsigned) systemVersion
{
return version;
}
/**
* Returns class name unarchivers will use to instantiate encoded objects
* when they report their class name as nameInArchive.
*/
+ (NSString*) classNameDecodedForArchiveClassName: (NSString*)nameInArchive
{
NSUnarchiverClassInfo *info = [clsDict objectForKey: nameInArchive];
NSString *alias;
if (info == nil)
{
return nil;
}
alias = info->name;
if (alias)
{
return alias;
}
return nameInArchive;
}
/**
* Sets class name unarchivers will use to instantiate encoded objects
* when they report their class name as nameInArchive. This can be used
* to support backwards compatibility across class name changes.
*/
+ (void) decodeClassName: (NSString*)nameInArchive
asClassName: (NSString*)trueName
{
Class c;
c = objc_lookUpClass([trueName cString]);
if (c == 0)
{
[NSException raise: NSInvalidArgumentException
format: @"can't find class %@", trueName];
}
else
{
NSUnarchiverClassInfo *info = [clsDict objectForKey: nameInArchive];
if (info == nil)
{
info = [NSUnarchiverClassInfo newWithName: nameInArchive];
[clsDict setObject: info forKey: nameInArchive];
RELEASE(info);
}
[info mapToClass: c withName: trueName];
}
}
/**
* Returns class name this unarchiver uses to instantiate encoded objects
* when they report their class name as nameInArchive.
*/
- (NSString*) classNameDecodedForArchiveClassName: (NSString*)nameInArchive
{
NSUnarchiverObjectInfo *info = [objDict objectForKey: nameInArchive];
NSString *alias;
if (info == nil)
{
return nil;
}
alias = mapClassName(info);
if (alias)
{
return alias;
}
return nameInArchive;
}
/**
* Set class name this unarchiver uses to instantiate encoded objects
* when they report their class name as nameInArchive. This can be used
* to provide backward compatibility across class name changes.
*/
- (void) decodeClassName: (NSString*)nameInArchive
asClassName: (NSString*)trueName
{
Class c;
c = objc_lookUpClass([trueName cString]);
if (c == 0)
{
[NSException raise: NSInvalidArgumentException
format: @"can't find class %@", trueName];
}
else
{
NSUnarchiverObjectInfo *info = [objDict objectForKey: nameInArchive];
if (info == nil)
{
info = [NSUnarchiverObjectInfo newWithName: nameInArchive];
[objDict setObject: info forKey: nameInArchive];
RELEASE(info);
}
[info mapToClass: c withName: trueName];
}
}
/**
* Set unarchiver to replace anObject with replacement whenever it is
* found decoded from the archive.
*/
- (void) replaceObject: (id)anObject withObject: (id)replacement
{
unsigned i;
if (replacement == anObject)
return;
for (i = GSIArrayCount(objMap) - 1; i > 0; i--)
{
if (GSIArrayItemAtIndex(objMap, i).obj == anObject)
{
GSIArraySetItemAtIndex(objMap, (GSIArrayItem)replacement, i);
return;
}
}
[NSException raise: NSInvalidArgumentException
format: @"object to be replaced does not exist"];
}
- (NSInteger) versionForClassName: (NSString*)className
{
NSUnarchiverObjectInfo *info;
info = [objDict objectForKey: className];
if (info == nil)
{
return NSNotFound;
}
return info->version;
}
@end
/**
* Category for compatibility with old GNUstep encoding.
*/
@implementation NSUnarchiver (GNUstep)
/**
* Return current position within archive byte array.
*/
- (unsigned) cursor
{
return cursor;
}
/**
* Prepare for reuse of the unarchiver to unpack a new archive, specified in
* anObject, starting at pos. Reads archive header.
*/
- (void) resetUnarchiverWithData: (NSData*)anObject
atIndex: (unsigned)pos
{
unsigned sizeC;
unsigned sizeO;
unsigned sizeP;
if (anObject == nil)
{
[NSException raise: NSInvalidArgumentException
format: @"nil passed to resetUnarchiverWithData:atIndex:"];
}
if (data != anObject)
{
Class c;
TEST_RELEASE(data);
data = RETAIN(anObject);
c = object_getClass(data);
if (src != self)
{
src = data;
if (c != dataClass)
{
/*
* Cache methods for deserialising from the data object.
*/
desImp = [src methodForSelector: desSel];
tagImp = (void (*)(id, SEL, unsigned char*, unsigned*, unsigned*))
[src methodForSelector: tagSel];
}
}
dataClass = c;
}
/*
* Read header including version and crossref table sizes.
*/
cursor = pos;
[self deserializeHeaderAt: &cursor
version: &version
classes: &sizeC
objects: &sizeO
pointers: &sizeP];
if (version > encodingVersion)
{
[NSException raise: NSInvalidArgumentException
format: @"Archive systemVersion (%u) not recognised", version];
}
if (clsMap == 0)
{
/*
* Allocate and initialise arrays to build crossref maps in.
*/
clsMap = NSZoneMalloc(zone, sizeof(GSIArray_t)*3);
GSIArrayInitWithZoneAndCapacity(clsMap, zone, sizeC);
GSIArrayAddItem(clsMap, (GSIArrayItem)(void*)0);
objMap = &clsMap[1];
GSIArrayInitWithZoneAndCapacity(objMap, zone, sizeO);
GSIArrayAddItem(objMap, (GSIArrayItem)(void*)0);
ptrMap = &clsMap[2];
GSIArrayInitWithZoneAndCapacity(ptrMap, zone, sizeP);
GSIArrayAddItem(ptrMap, (GSIArrayItem)(void*)0);
}
else
{
clsMap->count = 1;
objMap->count = 1;
ptrMap->count = 1;
}
[objDict removeAllObjects];
[objSave removeAllObjects];
}
/**
* Reads in header for GNUstep archive format.
*/
- (void) deserializeHeaderAt: (unsigned*)pos
version: (unsigned*)v
classes: (unsigned*)c
objects: (unsigned*)o
pointers: (unsigned*)p
{
unsigned plen = strlen(PREFIX);
unsigned size = plen+36;
char header[size+1];
[data getBytes: header range: NSMakeRange(*pos, size)];
*pos += size;
header[size] = '\0';
if (strncmp(header, PREFIX, plen) != 0)
{
[NSException raise: NSInternalInconsistencyException
format: @"Archive has wrong prefix"];
}
if (sscanf(&header[plen], "%x:%x:%x:%x:", v, c, o, p) != 4)
{
[NSException raise: NSInternalInconsistencyException
format: @"Archive has wrong prefix"];
}
}
/**
* Returns YES.
*/
- (BOOL) directDataAccess
{
return YES;
}
@end
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