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JSONKit.m
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//
// JSONKit.m
// http://github.com/johnezang/JSONKit
// Licensed under the terms of the BSD License, as specified below.
//
/*
Copyright (c) 2011, John Engelhart
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the Zang Industries nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
Acknowledgments:
The bulk of the UTF8 / UTF32 conversion and verification comes
from ConvertUTF.[hc]. It has been modified from the original sources.
The original sources were obtained from http://www.unicode.org/.
However, the web site no longer seems to host the files. Instead,
the Unicode FAQ http://www.unicode.org/faq//utf_bom.html#gen4
points to International Components for Unicode (ICU)
http://site.icu-project.org/ as an example of how to write a UTF
converter.
The decision to use the ConvertUTF.[ch] code was made to leverage
"proven" code. Hopefully the local modifications are bug free.
The code in isValidCodePoint() is derived from the ICU code in
utf.h for the macros U_IS_UNICODE_NONCHAR and U_IS_UNICODE_CHAR.
From the original ConvertUTF.[ch]:
* Copyright 2001-2004 Unicode, Inc.
*
* Disclaimer
*
* This source code is provided as is by Unicode, Inc. No claims are
* made as to fitness for any particular purpose. No warranties of any
* kind are expressed or implied. The recipient agrees to determine
* applicability of information provided. If this file has been
* purchased on magnetic or optical media from Unicode, Inc., the
* sole remedy for any claim will be exchange of defective media
* within 90 days of receipt.
*
* Limitations on Rights to Redistribute This Code
*
* Unicode, Inc. hereby grants the right to freely use the information
* supplied in this file in the creation of products supporting the
* Unicode Standard, and to make copies of this file in any form
* for internal or external distribution as long as this notice
* remains attached.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <sys/errno.h>
#include <math.h>
#include <limits.h>
#include <objc/runtime.h>
#import "JSONKit.h"
//#include <CoreFoundation/CoreFoundation.h>
#include <CoreFoundation/CFString.h>
#include <CoreFoundation/CFArray.h>
#include <CoreFoundation/CFDictionary.h>
#include <CoreFoundation/CFNumber.h>
//#import <Foundation/Foundation.h>
#import <Foundation/NSArray.h>
#import <Foundation/NSAutoreleasePool.h>
#import <Foundation/NSData.h>
#import <Foundation/NSDictionary.h>
#import <Foundation/NSException.h>
#import <Foundation/NSNull.h>
#import <Foundation/NSObjCRuntime.h>
#ifdef JK_ENABLE_CF_TRANSFER_OWNERSHIP_CALLBACKS
#warning As of JSONKit v1.4, JK_ENABLE_CF_TRANSFER_OWNERSHIP_CALLBACKS is no longer required. It is no longer a valid option.
#endif
#ifdef __OBJC_GC__
#error JSONKit does not support Objective-C Garbage Collection
#endif
// The following checks are really nothing more than sanity checks.
// JSONKit technically has a few problems from a "strictly C99 conforming" standpoint, though they are of the pedantic nitpicking variety.
// In practice, though, for the compilers and architectures we can reasonably expect this code to be compiled for, these pedantic nitpicks aren't really a problem.
// Since we're limited as to what we can do with pre-processor #if checks, these checks are not nearly as through as they should be.
#if (UINT_MAX != 0xffffffffU) || (INT_MIN != (-0x7fffffff-1)) || (ULLONG_MAX != 0xffffffffffffffffULL) || (LLONG_MIN != (-0x7fffffffffffffffLL-1LL))
#error JSONKit requires the C 'int' and 'long long' types to be 32 and 64 bits respectively.
#endif
#if !defined(__LP64__) && ((UINT_MAX != ULONG_MAX) || (INT_MAX != LONG_MAX) || (INT_MIN != LONG_MIN) || (WORD_BIT != LONG_BIT))
#error JSONKit requires the C 'int' and 'long' types to be the same on 32-bit architectures.
#endif
// Cocoa / Foundation uses NS*Integer as the type for a lot of arguments. We make sure that NS*Integer is something we are expecting and is reasonably compatible with size_t / ssize_t
#if (NSUIntegerMax != ULONG_MAX) || (NSIntegerMax != LONG_MAX) || (NSIntegerMin != LONG_MIN)
#error JSONKit requires NSInteger and NSUInteger to be the same size as the C 'long' type.
#endif
#if (NSUIntegerMax != SIZE_MAX) || (NSIntegerMax != SSIZE_MAX)
#error JSONKit requires NSInteger and NSUInteger to be the same size as the C 'size_t' type.
#endif
// For DJB hash.
#define JK_HASH_INIT (1402737925UL)
// Use __builtin_clz() instead of trailingBytesForUTF8[] table lookup.
#define JK_FAST_TRAILING_BYTES
// JK_CACHE_SLOTS must be a power of 2. Default size is 1024 slots.
#define JK_CACHE_SLOTS_BITS (10)
#define JK_CACHE_SLOTS (1UL << JK_CACHE_SLOTS_BITS)
// JK_CACHE_PROBES is the number of probe attempts.
#define JK_CACHE_PROBES (4UL)
// JK_INIT_CACHE_AGE must be (1 << AGE) - 1
#define JK_INIT_CACHE_AGE (0)
// JK_TOKENBUFFER_SIZE is the default stack size for the temporary buffer used to hold "non-simple" strings (i.e., contains \ escapes)
#define JK_TOKENBUFFER_SIZE (1024UL * 2UL)
// JK_STACK_OBJS is the default number of spaces reserved on the stack for temporarily storing pointers to Obj-C objects before they can be transferred to a NSArray / NSDictionary.
#define JK_STACK_OBJS (1024UL * 1UL)
#define JK_JSONBUFFER_SIZE (1024UL * 4UL)
#define JK_UTF8BUFFER_SIZE (1024UL * 16UL)
#define JK_ENCODE_CACHE_SLOTS (1024UL)
#if defined (__GNUC__) && (__GNUC__ >= 4)
#define JK_ATTRIBUTES(attr, ...) __attribute__((attr, ##__VA_ARGS__))
#define JK_EXPECTED(cond, expect) __builtin_expect((long)(cond), (expect))
#define JK_EXPECT_T(cond) JK_EXPECTED(cond, 1U)
#define JK_EXPECT_F(cond) JK_EXPECTED(cond, 0U)
#define JK_PREFETCH(ptr) __builtin_prefetch(ptr)
#else // defined (__GNUC__) && (__GNUC__ >= 4)
#define JK_ATTRIBUTES(attr, ...)
#define JK_EXPECTED(cond, expect) (cond)
#define JK_EXPECT_T(cond) (cond)
#define JK_EXPECT_F(cond) (cond)
#define JK_PREFETCH(ptr)
#endif // defined (__GNUC__) && (__GNUC__ >= 4)
#define JK_STATIC_INLINE static __inline__ JK_ATTRIBUTES(always_inline)
#define JK_ALIGNED(arg) JK_ATTRIBUTES(aligned(arg))
#define JK_UNUSED_ARG JK_ATTRIBUTES(unused)
#define JK_WARN_UNUSED JK_ATTRIBUTES(warn_unused_result)
#define JK_WARN_UNUSED_CONST JK_ATTRIBUTES(warn_unused_result, const)
#define JK_WARN_UNUSED_PURE JK_ATTRIBUTES(warn_unused_result, pure)
#define JK_WARN_UNUSED_SENTINEL JK_ATTRIBUTES(warn_unused_result, sentinel)
#define JK_NONNULL_ARGS(arg, ...) JK_ATTRIBUTES(nonnull(arg, ##__VA_ARGS__))
#define JK_WARN_UNUSED_NONNULL_ARGS(arg, ...) JK_ATTRIBUTES(warn_unused_result, nonnull(arg, ##__VA_ARGS__))
#define JK_WARN_UNUSED_CONST_NONNULL_ARGS(arg, ...) JK_ATTRIBUTES(warn_unused_result, const, nonnull(arg, ##__VA_ARGS__))
#define JK_WARN_UNUSED_PURE_NONNULL_ARGS(arg, ...) JK_ATTRIBUTES(warn_unused_result, pure, nonnull(arg, ##__VA_ARGS__))
#if defined (__GNUC__) && (__GNUC__ >= 4) && (__GNUC_MINOR__ >= 3)
#define JK_ALLOC_SIZE_NON_NULL_ARGS_WARN_UNUSED(as, nn, ...) JK_ATTRIBUTES(warn_unused_result, nonnull(nn, ##__VA_ARGS__), alloc_size(as))
#else // defined (__GNUC__) && (__GNUC__ >= 4) && (__GNUC_MINOR__ >= 3)
#define JK_ALLOC_SIZE_NON_NULL_ARGS_WARN_UNUSED(as, nn, ...) JK_ATTRIBUTES(warn_unused_result, nonnull(nn, ##__VA_ARGS__))
#endif // defined (__GNUC__) && (__GNUC__ >= 4) && (__GNUC_MINOR__ >= 3)
@class JKArray, JKDictionaryEnumerator, JKDictionary;
enum {
JSONNumberStateStart = 0,
JSONNumberStateFinished = 1,
JSONNumberStateError = 2,
JSONNumberStateWholeNumberStart = 3,
JSONNumberStateWholeNumberMinus = 4,
JSONNumberStateWholeNumberZero = 5,
JSONNumberStateWholeNumber = 6,
JSONNumberStatePeriod = 7,
JSONNumberStateFractionalNumberStart = 8,
JSONNumberStateFractionalNumber = 9,
JSONNumberStateExponentStart = 10,
JSONNumberStateExponentPlusMinus = 11,
JSONNumberStateExponent = 12,
};
enum {
JSONStringStateStart = 0,
JSONStringStateParsing = 1,
JSONStringStateFinished = 2,
JSONStringStateError = 3,
JSONStringStateEscape = 4,
JSONStringStateEscapedUnicode1 = 5,
JSONStringStateEscapedUnicode2 = 6,
JSONStringStateEscapedUnicode3 = 7,
JSONStringStateEscapedUnicode4 = 8,
JSONStringStateEscapedUnicodeSurrogate1 = 9,
JSONStringStateEscapedUnicodeSurrogate2 = 10,
JSONStringStateEscapedUnicodeSurrogate3 = 11,
JSONStringStateEscapedUnicodeSurrogate4 = 12,
JSONStringStateEscapedNeedEscapeForSurrogate = 13,
JSONStringStateEscapedNeedEscapedUForSurrogate = 14,
};
enum {
JKParseAcceptValue = (1 << 0),
JKParseAcceptComma = (1 << 1),
JKParseAcceptEnd = (1 << 2),
JKParseAcceptValueOrEnd = (JKParseAcceptValue | JKParseAcceptEnd),
JKParseAcceptCommaOrEnd = (JKParseAcceptComma | JKParseAcceptEnd),
};
enum {
JKClassUnknown = 0,
JKClassString = 1,
JKClassNumber = 2,
JKClassArray = 3,
JKClassDictionary = 4,
JKClassNull = 5,
};
enum {
JKManagedBufferOnStack = 1,
JKManagedBufferOnHeap = 2,
JKManagedBufferLocationMask = (0x3),
JKManagedBufferLocationShift = (0),
JKManagedBufferMustFree = (1 << 2),
};
typedef JKFlags JKManagedBufferFlags;
enum {
JKObjectStackOnStack = 1,
JKObjectStackOnHeap = 2,
JKObjectStackLocationMask = (0x3),
JKObjectStackLocationShift = (0),
JKObjectStackMustFree = (1 << 2),
};
typedef JKFlags JKObjectStackFlags;
enum {
JKTokenTypeInvalid = 0,
JKTokenTypeNumber = 1,
JKTokenTypeString = 2,
JKTokenTypeObjectBegin = 3,
JKTokenTypeObjectEnd = 4,
JKTokenTypeArrayBegin = 5,
JKTokenTypeArrayEnd = 6,
JKTokenTypeSeparator = 7,
JKTokenTypeComma = 8,
JKTokenTypeTrue = 9,
JKTokenTypeFalse = 10,
JKTokenTypeNull = 11,
JKTokenTypeWhiteSpace = 12,
};
typedef NSUInteger JKTokenType;
// These are prime numbers to assist with hash slot probing.
enum {
JKValueTypeNone = 0,
JKValueTypeString = 5,
JKValueTypeLongLong = 7,
JKValueTypeUnsignedLongLong = 11,
JKValueTypeDouble = 13,
};
typedef NSUInteger JKValueType;
enum {
JKEncodeAsData = 1,
JKEncodeAsString = 2,
};
typedef NSUInteger JKEncodeAsType;
typedef NSUInteger JKHash;
typedef struct JKTokenCacheItem JKTokenCacheItem;
typedef struct JKTokenCache JKTokenCache;
typedef struct JKTokenValue JKTokenValue;
typedef struct JKParseToken JKParseToken;
typedef struct JKPtrRange JKPtrRange;
typedef struct JKObjectStack JKObjectStack;
typedef struct JKBuffer JKBuffer;
typedef struct JKConstBuffer JKConstBuffer;
typedef struct JKConstPtrRange JKConstPtrRange;
typedef struct JKRange JKRange;
typedef struct JKManagedBuffer JKManagedBuffer;
typedef struct JKFastClassLookup JKFastClassLookup;
typedef struct JKEncodeCache JKEncodeCache;
typedef struct JKEncodeState JKEncodeState;
typedef struct JKObjCImpCache JKObjCImpCache;
typedef struct JKHashTableEntry JKHashTableEntry;
typedef id (*NSNumberAllocImp)(id object, SEL selector);
typedef id (*NSNumberInitWithUnsignedLongLongImp)(id object, SEL selector, unsigned long long value);
typedef int (*_jk_encode_write1)(JKEncodeState *encodeState, ssize_t depthChange, const char *format);
struct JKPtrRange {
unsigned char *ptr;
size_t length;
};
struct JKConstPtrRange {
const unsigned char *ptr;
size_t length;
};
struct JKRange {
size_t location, length;
};
struct JKManagedBuffer {
JKPtrRange bytes;
JKManagedBufferFlags flags;
size_t roundSizeUpToMultipleOf;
};
struct JKObjectStack {
void **objects, **keys;
CFHashCode *cfHashes;
size_t count, index, roundSizeUpToMultipleOf;
JKObjectStackFlags flags;
};
struct JKBuffer {
JKPtrRange bytes;
};
struct JKConstBuffer {
JKConstPtrRange bytes;
};
struct JKTokenValue {
JKConstPtrRange ptrRange;
JKValueType type;
JKHash hash;
union {
long long longLongValue;
unsigned long long unsignedLongLongValue;
double doubleValue;
} number;
JKTokenCacheItem *cacheItem;
};
struct JKParseToken {
JKConstPtrRange tokenPtrRange;
JKTokenType type;
JKTokenValue value;
JKManagedBuffer tokenBuffer;
};
struct JKTokenCacheItem {
void *object;
JKHash hash;
CFHashCode cfHash;
size_t size;
unsigned char *bytes;
JKValueType type;
};
struct JKTokenCache {
JKTokenCacheItem *items;
size_t count;
unsigned int prng_lfsr;
unsigned char age[JK_CACHE_SLOTS];
};
struct JKObjCImpCache {
Class NSNumberClass;
NSNumberAllocImp NSNumberAlloc;
NSNumberInitWithUnsignedLongLongImp NSNumberInitWithUnsignedLongLong;
};
struct JKParseState {
JKParseOptionFlags parseOptionFlags;
JKConstBuffer stringBuffer;
size_t atIndex, lineNumber, lineStartIndex;
size_t prev_atIndex, prev_lineNumber, prev_lineStartIndex;
JKParseToken token;
JKObjectStack objectStack;
JKTokenCache cache;
JKObjCImpCache objCImpCache;
NSError *error;
int errorIsPrev;
BOOL mutableCollections;
};
struct JKFastClassLookup {
void *stringClass;
void *numberClass;
void *arrayClass;
void *dictionaryClass;
void *nullClass;
};
struct JKEncodeCache {
id object;
size_t offset;
size_t length;
};
struct JKEncodeState {
JKManagedBuffer utf8ConversionBuffer;
JKManagedBuffer stringBuffer;
size_t atIndex;
JKFastClassLookup fastClassLookup;
JKEncodeCache cache[JK_ENCODE_CACHE_SLOTS];
JKSerializeOptionFlags serializeOptionFlags;
size_t depth;
_jk_encode_write1 write1;
NSError *error;
};
struct JKHashTableEntry {
NSUInteger keyHash;
id key, object;
};
typedef uint32_t UTF32; /* at least 32 bits */
typedef uint16_t UTF16; /* at least 16 bits */
typedef uint8_t UTF8; /* typically 8 bits */
typedef enum {
conversionOK, /* conversion successful */
sourceExhausted, /* partial character in source, but hit end */
targetExhausted, /* insuff. room in target for conversion */
sourceIllegal /* source sequence is illegal/malformed */
} ConversionResult;
#define UNI_REPLACEMENT_CHAR (UTF32)0x0000FFFD
#define UNI_MAX_BMP (UTF32)0x0000FFFF
#define UNI_MAX_UTF16 (UTF32)0x0010FFFF
#define UNI_MAX_UTF32 (UTF32)0x7FFFFFFF
#define UNI_MAX_LEGAL_UTF32 (UTF32)0x0010FFFF
#define UNI_SUR_HIGH_START (UTF32)0xD800
#define UNI_SUR_HIGH_END (UTF32)0xDBFF
#define UNI_SUR_LOW_START (UTF32)0xDC00
#define UNI_SUR_LOW_END (UTF32)0xDFFF
#if !defined(JK_FAST_TRAILING_BYTES)
static const char trailingBytesForUTF8[256] = {
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5
};
#endif
static const UTF32 offsetsFromUTF8[6] = { 0x00000000UL, 0x00003080UL, 0x000E2080UL, 0x03C82080UL, 0xFA082080UL, 0x82082080UL };
static const UTF8 firstByteMark[7] = { 0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
#define JK_AT_STRING_PTR(x) (&((x)->stringBuffer.bytes.ptr[(x)->atIndex]))
#define JK_END_STRING_PTR(x) (&((x)->stringBuffer.bytes.ptr[(x)->stringBuffer.bytes.length]))
static void jk_swizzleInstanceMethod(Class fromClass, Class toClass, SEL selector);
static void jk_swizzleClassMethod(Class fromClass, Class toClass, SEL selector);
static JKArray *_JKArrayCreate(id *objects, NSUInteger count, BOOL mutableCollection);
static NSUInteger _JKArrayCount(JKArray *array);
static void _JKArrayIncrementMutations(JKArray *array);
static void _JKArrayInsertObjectAtIndex(JKArray *array, id newObject, NSUInteger objectIndex);
static void _JKArrayReplaceObjectAtIndexWithObject(JKArray *array, NSUInteger objectIndex, id newObject);
static void _JKArrayRemoveObjectAtIndex(JKArray *array, NSUInteger objectIndex);
static NSUInteger _JKDictionaryCapacityForCount(NSUInteger count);
static JKDictionary *_JKDictionaryCreate(id *keys, NSUInteger *keyHashes, id *objects, NSUInteger count, BOOL mutableCollection);
static JKHashTableEntry *_JKDictionaryHashEntry(JKDictionary *dictionary);
static NSUInteger _JKDictionaryCapacity(JKDictionary *dictionary);
static NSUInteger _JKDictionaryCount(JKDictionary *dictionary);
static void _JKDictionaryIncrementMutations(JKDictionary *dictionary);
static void _JKDictionaryResizeIfNeccessary(JKDictionary *dictionary);
static void _JKDictionaryRemoveObjectWithEntry(JKDictionary *dictionary, JKHashTableEntry *entry);
static void _JKDictionaryAddObject(JKDictionary *dictionary, NSUInteger keyHash, id key, id object);
static JKHashTableEntry *_JKDictionaryHashTableEntryForKey(JKDictionary *dictionary, id aKey);
static NSUInteger _JKDictionaryGetKeysAndObjects(JKDictionary *dictionary, NSUInteger arrayLength, id keys[arrayLength], id objects[arrayLength]);
static void _JSONDecoderCleanup(JSONDecoder *decoder);
static id _NSStringObjectFromJSONString(NSString *jsonString, JKParseOptionFlags parseOptionFlags, NSError **error, BOOL mutableCollection);
static void jk_managedBuffer_release(JKManagedBuffer *managedBuffer);
static void jk_managedBuffer_setToStackBuffer(JKManagedBuffer *managedBuffer, unsigned char *ptr, size_t length);
static unsigned char *jk_managedBuffer_resize(JKManagedBuffer *managedBuffer, size_t newSize);
static void jk_objectStack_release(JKObjectStack *objectStack);
static void jk_objectStack_setToStackBuffer(JKObjectStack *objectStack, void **objects, void **keys, CFHashCode *cfHashes, size_t count);
static int jk_objectStack_resize(JKObjectStack *objectStack, size_t newCount);
static void jk_error(JKParseState *parseState, NSString *format, ...);
static int jk_parse_string(JKParseState *parseState);
static int jk_parse_number(JKParseState *parseState);
static size_t jk_parse_is_newline(JKParseState *parseState, const unsigned char *atCharacterPtr);
JK_STATIC_INLINE int jk_parse_skip_newline(JKParseState *parseState);
JK_STATIC_INLINE void jk_parse_skip_whitespace(JKParseState *parseState);
static int jk_parse_next_token(JKParseState *parseState);
static void jk_error_parse_accept_or3(JKParseState *parseState, int state, NSString *or1String, NSString *or2String, NSString *or3String);
static void *jk_create_dictionary(JKParseState *parseState, size_t startingObjectIndex);
static void *jk_parse_dictionary(JKParseState *parseState);
static void *jk_parse_array(JKParseState *parseState);
static void *jk_object_for_token(JKParseState *parseState);
static void *jk_cachedObjects(JKParseState *parseState);
JK_STATIC_INLINE void jk_cache_age(JKParseState *parseState);
JK_STATIC_INLINE void jk_set_parsed_token(JKParseState *parseState, const unsigned char *ptr, size_t length, JKTokenType type, size_t advanceBy);
static void jk_encode_error(JKEncodeState *encodeState, NSString *format, ...);
static int jk_encode_printf(JKEncodeState *encodeState, JKEncodeCache *cacheSlot, size_t startingAtIndex, id object, const char *format, ...);
static int jk_encode_write(JKEncodeState *encodeState, JKEncodeCache *cacheSlot, size_t startingAtIndex, id object, const char *format);
static int jk_encode_write1fast(JKEncodeState *encodeState, ssize_t depthChange JK_UNUSED_ARG, const char *format);
static int jk_encode_writePrettyPrintWhiteSpace(JKEncodeState *encodeState);
static int jk_encode_write1slow(JKEncodeState *encodeState, ssize_t depthChange, const char *format);
static int jk_encode_writen(JKEncodeState *encodeState, JKEncodeCache *cacheSlot, size_t startingAtIndex, id object, const char *format, size_t length);
JK_STATIC_INLINE JKHash jk_encode_object_hash(void *objectPtr);
JK_STATIC_INLINE void jk_encode_updateCache(JKEncodeState *encodeState, JKEncodeCache *cacheSlot, size_t startingAtIndex, id object);
static int jk_encode_add_atom_to_buffer(JKEncodeState *encodeState, void *objectPtr);
static id jk_encode(void *object, JKSerializeOptionFlags optionFlags, JKEncodeAsType encodeAs, NSError **error);
JK_STATIC_INLINE size_t jk_min(size_t a, size_t b);
JK_STATIC_INLINE size_t jk_max(size_t a, size_t b);
JK_STATIC_INLINE JKHash calculateHash(JKHash currentHash, unsigned char c);
#pragma mark -
#pragma mark ObjC Voodoo
// These two functions are used to perform some ObjC swizzeling voodoo to implement our mutable collection classes.
static void jk_swizzleInstanceMethod(Class fromClass, Class toClass, SEL selector) {
fromClass = class_isMetaClass(fromClass) ? objc_getClass(class_getName(fromClass)) : fromClass;
toClass = class_isMetaClass(toClass) ? objc_getClass(class_getName(toClass)) : toClass;
class_replaceMethod(fromClass, selector, method_getImplementation(class_getInstanceMethod(toClass, selector)), method_getTypeEncoding(class_getInstanceMethod(toClass, selector)));
}
static void jk_swizzleClassMethod(Class fromClass, Class toClass, SEL selector) {
fromClass = class_isMetaClass(fromClass) ? fromClass : objc_getMetaClass(class_getName(fromClass));
toClass = class_isMetaClass(toClass) ? toClass : objc_getMetaClass(class_getName(toClass));
class_replaceMethod(fromClass, selector, method_getImplementation(class_getClassMethod(toClass, selector)), method_getTypeEncoding(class_getClassMethod(toClass, selector)));
}
#pragma mark -
@interface JKArray : NSArray <NSCopying, NSMutableCopying, NSFastEnumeration> {
id *objects;
NSUInteger count, capacity, mutations;
}
@end
@implementation JKArray
static Class _JKArrayClass = NULL;
static Class _JKMutableArrayClass = NULL;
static size_t _JKArrayInstanceSize = 0UL;
+ (void)load
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; // Though technically not required, the run time environment at +load time may be less than ideal.
_JKArrayClass = objc_getClass("JKArray");
_JKMutableArrayClass = objc_getClass("JKMutableArray");
_JKArrayInstanceSize = class_getInstanceSize(_JKArrayClass);
if(_JKArrayInstanceSize < 16UL) { _JKArrayInstanceSize = 16UL; }
[pool release]; pool = NULL;
}
+ (id)allocWithZone:(NSZone *)zone
{
#pragma unused(zone)
[NSException raise:NSInvalidArgumentException format:@"*** - [%@ %@]: The %@ class is private to JSONKit and should not be used in this fashion.", NSStringFromClass([self class]), NSStringFromSelector(_cmd), NSStringFromClass([self class])];
return(NULL);
}
static JKArray *_JKArrayCreate(id *objects, NSUInteger count, BOOL mutableCollection) {
NSCParameterAssert((objects != NULL) && (_JKArrayClass != NULL) && (_JKArrayInstanceSize > 0UL));
JKArray *array = NULL;
if(JK_EXPECT_T((array = (JKArray *)calloc(1UL, _JKArrayInstanceSize)) != NULL)) { // Directly allocate the JKArray instance via calloc.
array->isa = (mutableCollection == NO) ? _JKArrayClass : _JKMutableArrayClass;
array->capacity = count;
array->count = count;
if(JK_EXPECT_F((array->objects = (id *)malloc(sizeof(id) * array->capacity)) == NULL)) { [array autorelease]; return(NULL); }
memcpy(array->objects, objects, array->capacity * sizeof(id));
}
return(array);
}
static NSUInteger _JKArrayCount(JKArray *array) {
NSCParameterAssert((array != NULL) && (array->objects != NULL) && (array->count <= array->capacity));
return(array->count);
}
static void _JKArrayIncrementMutations(JKArray *array) {
NSCParameterAssert((array != NULL) && (array->objects != NULL) && (array->count <= array->capacity));
array->mutations++;
}
// Note: The caller is responsible for -retaining the object that is to be added.
static void _JKArrayInsertObjectAtIndex(JKArray *array, id newObject, NSUInteger objectIndex) {
NSCParameterAssert((array != NULL) && (array->objects != NULL) && (array->count <= array->capacity) && (objectIndex <= array->count) && (newObject != NULL));
if(!((array != NULL) && (array->objects != NULL) && (objectIndex <= array->count) && (newObject != NULL))) { return; }
array->count++;
if(array->count >= array->capacity) {
array->capacity += 16UL;
if((array->objects = (id *)reallocf(array->objects, sizeof(id) * array->capacity)) == NULL) { [NSException raise:NSMallocException format:@"Unable to resize objects array."]; }
memset(&array->objects[array->count], 0, sizeof(id) * (array->capacity - array->count));
}
if((objectIndex + 1UL) < array->count) { memmove(&array->objects[objectIndex + 1UL], &array->objects[objectIndex], sizeof(id) * ((array->count - 1UL) - objectIndex)); array->objects[objectIndex] = NULL; }
array->objects[objectIndex] = newObject;
}
// Note: The caller is responsible for -retaining the object that is to be added.
static void _JKArrayReplaceObjectAtIndexWithObject(JKArray *array, NSUInteger objectIndex, id newObject) {
NSCParameterAssert((array != NULL) && (array->objects != NULL) && (array->count <= array->capacity) && (objectIndex < array->count) && (array->objects[objectIndex] != NULL) && (newObject != NULL));
if(!((array != NULL) && (array->objects != NULL) && (objectIndex < array->count) && (array->objects[objectIndex] != NULL) && (newObject != NULL))) { return; }
CFRelease(array->objects[objectIndex]);
array->objects[objectIndex] = NULL;
array->objects[objectIndex] = newObject;
}
static void _JKArrayRemoveObjectAtIndex(JKArray *array, NSUInteger objectIndex) {
NSCParameterAssert((array != NULL) && (array->objects != NULL) && (array->count <= array->capacity) && (objectIndex < array->count) && (array->objects[objectIndex] != NULL));
if(!((array != NULL) && (array->objects != NULL) && (objectIndex < array->count) && (array->objects[objectIndex] != NULL))) { return; }
CFRelease(array->objects[objectIndex]);
array->objects[objectIndex] = NULL;
if((objectIndex + 1UL) < array->count) { memmove(&array->objects[objectIndex], &array->objects[objectIndex + 1UL], sizeof(id) * ((array->count - 1UL) - objectIndex)); array->objects[array->count] = NULL; }
array->count--;
}
- (void)dealloc
{
if(JK_EXPECT_T(objects != NULL)) {
NSUInteger atObject = 0UL;
for(atObject = 0UL; atObject < count; atObject++) { if(JK_EXPECT_T(objects[atObject] != NULL)) { CFRelease(objects[atObject]); objects[atObject] = NULL; } }
free(objects); objects = NULL;
}
[super dealloc];
}
- (NSUInteger)count
{
NSParameterAssert((objects != NULL) && (count <= capacity));
return(count);
}
- (void)getObjects:(id *)objectsPtr range:(NSRange)range
{
NSParameterAssert((objects != NULL) && (count <= capacity));
if((range.location > count) || (NSMaxRange(range) > count)) { [NSException raise:NSRangeException format:@"*** -[%@ %@]: index (%lu) beyond bounds (%lu)", NSStringFromClass([self class]), NSStringFromSelector(_cmd), NSMaxRange(range), count]; }
memcpy(objectsPtr, objects + range.location, range.length * sizeof(id));
}
- (id)objectAtIndex:(NSUInteger)objectIndex
{
if(objectIndex >= count) { [NSException raise:NSRangeException format:@"*** -[%@ %@]: index (%lu) beyond bounds (%lu)", NSStringFromClass([self class]), NSStringFromSelector(_cmd), objectIndex, count]; }
NSParameterAssert((objects != NULL) && (count <= capacity) && (objects[objectIndex] != NULL));
return(objects[objectIndex]);
}
- (NSUInteger)countByEnumeratingWithState:(NSFastEnumerationState *)state objects:(id *)stackbuf count:(NSUInteger)len
{
NSParameterAssert((objects != NULL) && (count <= capacity));
if(JK_EXPECT_F(state->state == 0UL)) { state->mutationsPtr = (unsigned long *)&mutations; state->itemsPtr = stackbuf; }
if(JK_EXPECT_F(state->state >= count)) { return(0UL); }
NSUInteger enumeratedCount = 0UL;
while(JK_EXPECT_T(enumeratedCount < len) && JK_EXPECT_T(state->state < count)) { NSParameterAssert(objects[state->state] != NULL); stackbuf[enumeratedCount++] = objects[state->state++]; }
return(enumeratedCount);
}
- (id)copyWithZone:(NSZone *)zone
{
#pragma unused(zone)
NSParameterAssert((objects != NULL) && (count <= capacity));
return([self retain]);
}
- (id)mutableCopyWithZone:(NSZone *)zone
{
NSParameterAssert((objects != NULL) && (count <= capacity));
return([[NSMutableArray allocWithZone:zone] initWithObjects:objects count:count]);
}
@end
#pragma mark -
@interface JKMutableArray : NSMutableArray
@end
@implementation JKMutableArray
+ (void)load
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; // Though technically not required, the run time environment at +load time may be less than ideal.
Class JKMutableArrayClass = objc_getClass("JKMutableArray"); Class JKArrayClass = objc_getClass("JKArray");
// We swizzle the methods from JKArray in to this class (JKArrayDictionary).
jk_swizzleClassMethod(JKMutableArrayClass, JKArrayClass, @selector(allocWithZone:));
jk_swizzleInstanceMethod(JKMutableArrayClass, JKArrayClass, @selector(dealloc));
jk_swizzleInstanceMethod(JKMutableArrayClass, JKArrayClass, @selector(count));
jk_swizzleInstanceMethod(JKMutableArrayClass, JKArrayClass, @selector(objectAtIndex:));
jk_swizzleInstanceMethod(JKMutableArrayClass, JKArrayClass, @selector(getObjects:range:));
jk_swizzleInstanceMethod(JKMutableArrayClass, JKArrayClass, @selector(countByEnumeratingWithState:objects:count:));
[pool release]; pool = NULL;
}
- (void)insertObject:(id)anObject atIndex:(NSUInteger)objectIndex
{
if(anObject == NULL) { [NSException raise:NSInvalidArgumentException format:@"*** -[%@ %@]: attempt to insert nil", NSStringFromClass([self class]), NSStringFromSelector(_cmd)]; }
if(objectIndex > _JKArrayCount((JKArray *)self)) { [NSException raise:NSRangeException format:@"*** -[%@ %@]: index (%lu) beyond bounds (%lu)", NSStringFromClass([self class]), NSStringFromSelector(_cmd), objectIndex, _JKArrayCount((JKArray *)self) + 1UL]; }
anObject = [anObject retain];
_JKArrayInsertObjectAtIndex((JKArray *)self, anObject, objectIndex);
_JKArrayIncrementMutations((JKArray *)self);
}
/*
- (void)addObject:(id)anObject
{
[self insertObject:anObject atIndex:_JKArrayCount((JKArray *)self)];
}
*/
- (void)removeObjectAtIndex:(NSUInteger)objectIndex
{
if(objectIndex >= _JKArrayCount((JKArray *)self)) { [NSException raise:NSRangeException format:@"*** -[%@ %@]: index (%lu) beyond bounds (%lu)", NSStringFromClass([self class]), NSStringFromSelector(_cmd), objectIndex, _JKArrayCount((JKArray *)self)]; }
_JKArrayRemoveObjectAtIndex((JKArray *)self, objectIndex);
_JKArrayIncrementMutations((JKArray *)self);
}
/*
- (void)removeLastObject
{
[self removeObjectAtIndex:_JKArrayCount((JKArray *)self) == 0UL ? 0UL : (_JKArrayCount((JKArray *)self) - 1UL)];
}
*/
- (void)replaceObjectAtIndex:(NSUInteger)objectIndex withObject:(id)anObject
{
if(anObject == NULL) { [NSException raise:NSInvalidArgumentException format:@"*** -[%@ %@]: attempt to insert nil", NSStringFromClass([self class]), NSStringFromSelector(_cmd)]; }
if(objectIndex >= _JKArrayCount((JKArray *)self)) { [NSException raise:NSRangeException format:@"*** -[%@ %@]: index (%lu) beyond bounds (%lu)", NSStringFromClass([self class]), NSStringFromSelector(_cmd), objectIndex, _JKArrayCount((JKArray *)self)]; }
anObject = [anObject retain];
_JKArrayReplaceObjectAtIndexWithObject((JKArray *)self, objectIndex, anObject);
_JKArrayIncrementMutations((JKArray *)self);
}
- (id)copyWithZone:(NSZone *)zone
{
NSUInteger arrayCount = [self count];
if(arrayCount == 0UL) { return([[NSArray allocWithZone:zone] init]); }
id stackObjects[arrayCount];
[self getObjects:stackObjects range:NSMakeRange(0UL, arrayCount)];
return([[NSArray allocWithZone:zone] initWithObjects:stackObjects count:arrayCount]);
}
- (id)mutableCopyWithZone:(NSZone *)zone
{
NSUInteger arrayCount = [self count];
if(arrayCount == 0UL) { return([[NSMutableArray allocWithZone:zone] init]); }
id stackObjects[arrayCount];
[self getObjects:stackObjects range:NSMakeRange(0UL, arrayCount)];
return([[NSMutableArray allocWithZone:zone] initWithObjects:stackObjects count:arrayCount]);
}
@end
#pragma mark -
@interface JKDictionaryEnumerator : NSEnumerator {
id collection;
NSUInteger nextObject;
}
- (id)initWithJKDictionary:(JKDictionary *)initDictionary;
- (NSArray *)allObjects;
- (id)nextObject;
@end
@implementation JKDictionaryEnumerator
- (id)initWithJKDictionary:(JKDictionary *)initDictionary
{
NSParameterAssert(initDictionary != NULL);
if((self = [super init]) == NULL) { return(NULL); }
if((collection = (id)CFRetain(initDictionary)) == NULL) { [self autorelease]; return(NULL); }
return(self);
}
- (void)dealloc
{
if(collection != NULL) { CFRelease(collection); collection = NULL; }
[super dealloc];
}
- (NSArray *)allObjects
{
NSParameterAssert(collection != NULL);
NSUInteger count = [collection count], atObject = 0UL;
id objects[count];
while((objects[atObject] = [self nextObject]) != NULL) { NSParameterAssert(atObject < count); atObject++; }
return([NSArray arrayWithObjects:objects count:atObject]);
}
- (id)nextObject
{
NSParameterAssert((collection != NULL) && (_JKDictionaryHashEntry(collection) != NULL));
JKHashTableEntry *entry = _JKDictionaryHashEntry(collection);
NSUInteger capacity = _JKDictionaryCapacity(collection);
id returnObject = NULL;
if(entry != NULL) { while((nextObject < capacity) && ((returnObject = entry[nextObject++].key) == NULL)) { /* ... */ } }
return(returnObject);
}
@end
#pragma mark -
@interface JKDictionary : NSDictionary <NSCopying, NSMutableCopying, NSFastEnumeration> {
NSUInteger count, capacity, mutations;
JKHashTableEntry *entry;
}
@end
@implementation JKDictionary
static Class _JKDictionaryClass = NULL;
static Class _JKMutableDictionaryClass = NULL;
static size_t _JKDictionaryInstanceSize = 0UL;
+ (void)load
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; // Though technically not required, the run time environment at +load time may be less than ideal.
_JKDictionaryClass = objc_getClass("JKDictionary");
_JKMutableDictionaryClass = objc_getClass("JKMutableDictionary");
_JKDictionaryInstanceSize = class_getInstanceSize(_JKDictionaryClass);
if(_JKDictionaryInstanceSize < 16UL) { _JKDictionaryInstanceSize = 16UL; }
[pool release]; pool = NULL;
}
+ (id)allocWithZone:(NSZone *)zone
{
#pragma unused(zone)
[NSException raise:NSInvalidArgumentException format:@"*** - [%@ %@]: The %@ class is private to JSONKit and should not be used in this fashion.", NSStringFromClass([self class]), NSStringFromSelector(_cmd), NSStringFromClass([self class])];
return(NULL);
}
// These values are taken from Core Foundation CF-550 CFBasicHash.m. As a bonus, they align very well with our JKHashTableEntry struct too.
static const NSUInteger jk_dictionaryCapacities[] = {
0UL, 3UL, 7UL, 13UL, 23UL, 41UL, 71UL, 127UL, 191UL, 251UL, 383UL, 631UL, 1087UL, 1723UL,
2803UL, 4523UL, 7351UL, 11959UL, 19447UL, 31231UL, 50683UL, 81919UL, 132607UL,
214519UL, 346607UL, 561109UL, 907759UL, 1468927UL, 2376191UL, 3845119UL,
6221311UL, 10066421UL, 16287743UL, 26354171UL, 42641881UL, 68996069UL,
111638519UL, 180634607UL, 292272623UL, 472907251UL
};
static NSUInteger _JKDictionaryCapacityForCount(NSUInteger count) {
NSUInteger bottom = 0UL, top = sizeof(jk_dictionaryCapacities) / sizeof(NSUInteger), mid = 0UL, tableSize = lround(floor((count) * 1.33));
while(top > bottom) { mid = (top + bottom) / 2UL; if(jk_dictionaryCapacities[mid] < tableSize) { bottom = mid + 1UL; } else { top = mid; } }
return(jk_dictionaryCapacities[bottom]);
}
static void _JKDictionaryResizeIfNeccessary(JKDictionary *dictionary) {
NSCParameterAssert((dictionary != NULL) && (dictionary->entry != NULL) && (dictionary->count <= dictionary->capacity));
NSUInteger capacityForCount = 0UL;
if(dictionary->capacity < (capacityForCount = _JKDictionaryCapacityForCount(dictionary->count + 1UL))) { // resize
NSUInteger oldCapacity = dictionary->capacity;
#ifndef NS_BLOCK_ASSERTIONS
NSUInteger oldCount = dictionary->count;
#endif
JKHashTableEntry *oldEntry = dictionary->entry;
if(JK_EXPECT_F((dictionary->entry = (JKHashTableEntry *)calloc(1UL, sizeof(JKHashTableEntry) * capacityForCount)) == NULL)) { [NSException raise:NSMallocException format:@"Unable to allocate memory for hash table."]; }
dictionary->capacity = capacityForCount;
dictionary->count = 0UL;
NSUInteger idx = 0UL;
for(idx = 0UL; idx < oldCapacity; idx++) { if(oldEntry[idx].key != NULL) { _JKDictionaryAddObject(dictionary, oldEntry[idx].keyHash, oldEntry[idx].key, oldEntry[idx].object); oldEntry[idx].keyHash = 0UL; oldEntry[idx].key = NULL; oldEntry[idx].object = NULL; } }
NSCParameterAssert((oldCount == dictionary->count));
free(oldEntry); oldEntry = NULL;
}
}
static JKDictionary *_JKDictionaryCreate(id *keys, NSUInteger *keyHashes, id *objects, NSUInteger count, BOOL mutableCollection) {
NSCParameterAssert((keys != NULL) && (keyHashes != NULL) && (objects != NULL) && (_JKDictionaryClass != NULL) && (_JKDictionaryInstanceSize > 0UL));
JKDictionary *dictionary = NULL;
if(JK_EXPECT_T((dictionary = (JKDictionary *)calloc(1UL, _JKDictionaryInstanceSize)) != NULL)) { // Directly allocate the JKArray instance via calloc.
dictionary->isa = (mutableCollection == NO) ? _JKDictionaryClass : _JKMutableDictionaryClass;
dictionary->capacity = _JKDictionaryCapacityForCount(count);
dictionary->count = 0UL;
if(JK_EXPECT_F((dictionary->entry = (JKHashTableEntry *)calloc(1UL, sizeof(JKHashTableEntry) * dictionary->capacity)) == NULL)) { [dictionary autorelease]; return(NULL); }
NSUInteger idx = 0UL;
for(idx = 0UL; idx < count; idx++) { _JKDictionaryAddObject(dictionary, keyHashes[idx], keys[idx], objects[idx]); }
}
return(dictionary);
}
- (void)dealloc
{
if(JK_EXPECT_T(entry != NULL)) {
NSUInteger atEntry = 0UL;
for(atEntry = 0UL; atEntry < capacity; atEntry++) {
if(JK_EXPECT_T(entry[atEntry].key != NULL)) { CFRelease(entry[atEntry].key); entry[atEntry].key = NULL; }
if(JK_EXPECT_T(entry[atEntry].object != NULL)) { CFRelease(entry[atEntry].object); entry[atEntry].object = NULL; }
}
free(entry); entry = NULL;
}
[super dealloc];
}
static JKHashTableEntry *_JKDictionaryHashEntry(JKDictionary *dictionary) {
NSCParameterAssert(dictionary != NULL);
return(dictionary->entry);
}
static NSUInteger _JKDictionaryCapacity(JKDictionary *dictionary) {
NSCParameterAssert(dictionary != NULL);
return(dictionary->capacity);
}
static NSUInteger _JKDictionaryCount(JKDictionary *dictionary) {
NSCParameterAssert(dictionary != NULL);
return(dictionary->count);
}
static void _JKDictionaryIncrementMutations(JKDictionary *dictionary) {
NSCParameterAssert(dictionary != NULL);
if(++dictionary->mutations == 0UL) { dictionary->mutations = 1UL; }
}
static void _JKDictionaryRemoveObjectWithEntry(JKDictionary *dictionary, JKHashTableEntry *entry) {
NSCParameterAssert((dictionary != NULL) && (entry != NULL) && (entry->key != NULL) && (entry->object != NULL) && (dictionary->count > 0UL));
CFRelease(entry->key); entry->key = NULL;
CFRelease(entry->object); entry->object = NULL;
entry->keyHash = 0UL;
dictionary->count--;
}
static void _JKDictionaryAddObject(JKDictionary *dictionary, NSUInteger keyHash, id key, id object) {
NSCParameterAssert((dictionary != NULL) && (key != NULL) && (object != NULL) && (dictionary->count < dictionary->capacity) && (dictionary->entry != NULL));
NSUInteger keyEntry = keyHash % dictionary->capacity, idx = 0UL;
for(idx = 0UL; idx < dictionary->capacity; idx++) {
NSUInteger entryIdx = (keyEntry + idx) % dictionary->capacity;
JKHashTableEntry *atEntry = &dictionary->entry[entryIdx];
if(JK_EXPECT_F(atEntry->keyHash == keyHash) && JK_EXPECT_T(atEntry->key != NULL) && (JK_EXPECT_F(key == atEntry->key) || JK_EXPECT_F(CFEqual(atEntry->key, key)))) { _JKDictionaryRemoveObjectWithEntry(dictionary, atEntry); }
if(JK_EXPECT_T(atEntry->key == NULL)) { atEntry->key = key; atEntry->object = object; atEntry->keyHash = keyHash; dictionary->count++; return; }
}