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JFBoxDecoder.m
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JFBoxDecoder.m
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//
// JFBoxDecoder.m
// JFCommon
//
// Created by Jason Fuerstenberg on 12/03/19.
// Copyright (c) 2012 Jason Fuerstenberg. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#import "JFBoxDecoder.h"
@interface JFBoxDecoder (PrivateMethods)
- (void) decodeHeader;
+ (void) populateError: (NSError **) error withCode: (SInt64) code;
- (UInt64) copy: (UInt64) numberOfBytes fromIndex: (UInt64) index ofData: (NSData *) data intoBytes: (char *) bytes withError: (NSError **) error;
+ (BOOL) isSupportedNumberType: (JFBoxType) boxType;
@end
@implementation JFBoxDecoder
#pragma mark - Properties
@synthesize index = _index;
@synthesize encounteredError = _encounteredError;
#pragma mark - Object lifecycle methods
+ (id) boxDecoderWithData: (NSData *) data {
id boxDecoder = [[JFBoxDecoder alloc] initWithData: data];
#if __has_feature(objc_arc)
// Using ARC so do nothing
#else
// Autorelease the instance
[boxDecoder autorelease];
#endif
return boxDecoder;
}
/*
* Instantiates a box decoder with data from which to decode.
* data must not be nil or less than 5 bytes.
*/
- (id) initWithData: (NSData *) data {
if ([data length] < JFBoxFormat1HeaderLength) {
return nil;
}
self = [super init];
if (self != nil) {
#if __has_feature(objc_arc)
_data = data;
#else
[data retain];
[_data release];
_data = data;
#endif
[self decodeHeader];
if (_encounteredError) {
return nil;
}
}
return self;
}
#if __has_feature(objc_arc)
// Using ARC so do nothing
- (void) dealloc {
_data = nil;
}
#else
- (void) dealloc {
[_data release];
[super dealloc];
}
#endif
/*
* Returns the type of the next entry.
* NOTE: Calling this method will not advance the decoder's index into the data.
*/
- (JFBoxType) nextEntryType {
NSError *error = nil;
JFBoxType type;
[self copy: JFBoxTypeEncodingLength fromIndex: _index ofData:_data intoBytes: (char *) &type withError: &error];
if ([error code] != 0) {
_encounteredError = YES;
return JFBoxTypeUnknown;
}
return type;
}
#pragma mark - Decoding methods
/*
* This method ensures that the next entry is nil before advancing the index.
* If the next entry is not nil a type mismatch error will be assigned.
*/
- (void) decodeNilWithError: (NSError **) error {
[JFBoxDecoder resetError: error];
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeNil) {
// The type is not nil so return.
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeMismatch];
return;
}
_index += JFBoxTypeEncodingLength;
}
- (BOOL) decodeBoolWithError: (NSError **) error {
[JFBoxDecoder resetError: error];
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeBool) {
// The type is not boolean so return.
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeMismatch];
return NO;
}
_index += JFBoxTypeEncodingLength;
BOOL value;
_index += [self copy: JFBoxBoolEncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &value
withError: error];
if (_encounteredError) {
return NO;
}
return value;
}
- (SInt8) decodeSInt8WithError: (NSError **) error {
[JFBoxDecoder resetError: error];
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeSInt8) {
// The type is not SInt8 so return.
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeMismatch];
return 0;
}
_index += JFBoxTypeEncodingLength;
SInt8 value;
_index += [self copy: JFBoxSInt8EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &value
withError: error];
if (_encounteredError) {
return 0;
}
return value;
}
- (SInt16) decodeSInt16WithError: (NSError **) error {
[JFBoxDecoder resetError: error];
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeSInt16) {
// The type is not SInt16 so return.
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeMismatch];
return 0;
}
_index += JFBoxTypeEncodingLength;
SInt16 value;
_index += [self copy: JFBoxSInt16EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &value
withError: error];
if (_encounteredError) {
return 0;
}
return value;
}
- (SInt32) decodeSInt32WithError: (NSError **) error {
[JFBoxDecoder resetError: error];
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeSInt32) {
// The type is not SInt32 so return.
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeMismatch];
return 0;
}
_index += JFBoxTypeEncodingLength;
SInt32 value;
_index += [self copy: JFBoxSInt32EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &value
withError: error];
if (_encounteredError) {
return 0;
}
return value;
}
- (SInt64) decodeSInt64WithError: (NSError **) error {
[JFBoxDecoder resetError: error];
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeSInt64) {
// The type is not SInt64 so return.
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeMismatch];
return 0;
}
_index += JFBoxTypeEncodingLength;
SInt64 value;
_index += [self copy: JFBoxSInt64EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &value
withError: error];
if (_encounteredError) {
return 0;
}
return value;
}
- (UInt8) decodeUInt8WithError: (NSError **) error {
[JFBoxDecoder resetError: error];
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeUInt8) {
// The type is not UInt8 so return.
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeMismatch];
return 0;
}
_index += JFBoxTypeEncodingLength;
UInt8 value;
_index += [self copy: JFBoxUInt8EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &value
withError: error];
if (_encounteredError) {
return 0;
}
return value;
}
- (UInt16) decodeUInt16WithError: (NSError **) error {
[JFBoxDecoder resetError: error];
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeUInt16) {
// The type is not UInt16 so return.
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeMismatch];
return 0;
}
_index += JFBoxTypeEncodingLength;
UInt16 value;
_index += [self copy: JFBoxUInt16EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &value
withError: error];
if (_encounteredError) {
return 0;
}
return value;
}
- (UInt32) decodeUInt32WithError: (NSError **) error {
[JFBoxDecoder resetError: error];
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeUInt32) {
// The type is not UInt32 so return.
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeMismatch];
return 0;
}
_index += JFBoxTypeEncodingLength;
UInt32 value;
_index += [self copy: JFBoxUInt32EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &value
withError: error];
if (_encounteredError) {
return 0;
}
return value;
}
- (UInt64) decodeUInt64WithError: (NSError **) error {
[JFBoxDecoder resetError: error];
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeUInt64) {
// The type is not UInt64 so return.
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeMismatch];
return 0;
}
_index += JFBoxTypeEncodingLength;
UInt64 value;
_index += [self copy: JFBoxUInt64EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &value
withError: error];
if (_encounteredError) {
return 0;
}
return value;
}
- (float) decodeFloatWithError: (NSError **) error {
[JFBoxDecoder resetError: error];
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeFloat) {
// The type is not float so return.
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeMismatch];
return 0;
}
_index += JFBoxTypeEncodingLength;
float value;
_index += [self copy: JFBoxFloatEncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &value
withError: error];
if (_encounteredError) {
return 0;
}
return value;
}
- (double) decodeDoubleWithError: (NSError **) error {
[JFBoxDecoder resetError: error];
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeDouble) {
// The type is not double so return.
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeMismatch];
return 0;
}
_index += JFBoxTypeEncodingLength;
double value;
_index += [self copy: JFBoxDoubleEncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &value
withError: error];
if (_encounteredError) {
return 0;
}
return value;
}
- (NSString *) decodeStringWithError: (NSError **) error {
[JFBoxDecoder resetError: error];
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeString) {
// The type is not string so return.
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeMismatch];
return nil;
}
_index += JFBoxTypeEncodingLength;
if ([self isNilObject]) {
return nil;
}
UInt64 length;
_index += [self copy: JFBoxUInt64EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &length
withError: error];
if (_encounteredError) {
return nil;
}
char *buffer = malloc(length + 1);
buffer[length] = 0;
_index += [self copy: length
fromIndex: _index
ofData: _data
intoBytes: (char *) buffer
withError: error];
if (_encounteredError) {
free(buffer);
return nil;
}
NSString *value = [NSString stringWithUTF8String: buffer];
free(buffer);
return value;
}
- (NSNumber *) decodeNumberWithError: (NSError **) error {
[JFBoxDecoder resetError: error];
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeNumber) {
// The type is not number so return.
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeMismatch];
return nil;
}
_index += JFBoxTypeEncodingLength;
if ([self isNilObject]) {
return nil;
}
JFBoxType subType;
_index += [self copy: JFBoxTypeEncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &subType
withError: error];
if (_encounteredError) {
return nil;
}
if (![JFBoxDecoder isSupportedNumberType: subType]) {
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeMismatch];
return nil;
}
NSNumber *value = nil;
char buffer[JFBoxUInt64EncodingLength];
switch (subType) {
case JFBoxTypeSInt8:
_index += [self copy: JFBoxSInt8EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &buffer
withError: error];
value = [NSNumber numberWithChar: *((char *) buffer)];
break;
case JFBoxTypeSInt16:
_index += [self copy: JFBoxSInt16EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &buffer
withError: error];
value = [NSNumber numberWithShort: *((short *) buffer)];
break;
case JFBoxTypeSInt32:
_index += [self copy: JFBoxSInt32EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &buffer
withError: error];
value = [NSNumber numberWithLong: *((long *) buffer)];
break;
case JFBoxTypeSInt64:
_index += [self copy: JFBoxSInt64EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &buffer
withError: error];
value = [NSNumber numberWithLongLong: *((long long*) buffer)];
break;
case JFBoxTypeUInt8:
_index += [self copy: JFBoxUInt8EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &buffer
withError: error];
value = [NSNumber numberWithUnsignedChar: *((unsigned char *) buffer)];
break;
case JFBoxTypeUInt16:
_index += [self copy: JFBoxUInt16EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &buffer
withError: error];
value = [NSNumber numberWithUnsignedShort: *((unsigned short *) buffer)];
break;
case JFBoxTypeUInt32:
_index += [self copy: JFBoxUInt32EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &buffer
withError: error];
value = [NSNumber numberWithUnsignedLong: *((unsigned long *) buffer)];
break;
case JFBoxTypeUInt64:
_index += [self copy: JFBoxUInt64EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &buffer
withError: error];
value = [NSNumber numberWithUnsignedLongLong: *((unsigned long long *) buffer)];
break;
case JFBoxTypeFloat:
_index += [self copy: JFBoxFloatEncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &buffer
withError: error];
value = [NSNumber numberWithFloat: *((float *) buffer)];
break;
case JFBoxTypeDouble:
_index += [self copy: JFBoxDoubleEncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &buffer
withError: error];
value = [NSNumber numberWithDouble: *((double *) buffer)];
break;
default:
return nil;
}
if (_encounteredError) {
return nil;
}
return value;
}
- (NSDate *) decodeDateWithError: (NSError **) error {
[JFBoxDecoder resetError: error];
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeDate) {
// The type is not date so return.
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeMismatch];
return 0;
}
_index += JFBoxTypeEncodingLength;
if ([self isNilObject]) {
return nil;
}
NSTimeInterval value;
_index += [self copy: JFBoxDateEncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &value
withError: error];
if (_encounteredError) {
return 0;
}
NSDate *dateValue = [NSDate dateWithTimeIntervalSince1970: value];
if (dateValue == nil) {
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeInvalidValue];
}
return dateValue;
}
- (NSData *) decodeDataWithError: (NSError **) error {
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeData) {
// The type is not data so return.
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeMismatch];
return nil;
}
_index += JFBoxTypeEncodingLength;
if ([self isNilObject]) {
return nil;
}
UInt64 length;
_index += [self copy: JFBoxUInt64EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &length
withError: error];
if (_encounteredError) {
return nil;
}
char *buffer = malloc(length);
_index += [self copy: length
fromIndex: _index
ofData: _data
intoBytes: (char *) buffer
withError: error];
if (_encounteredError) {
free(buffer);
return nil;
}
NSData *value = [NSData dataWithBytes: buffer
length: length];
free(buffer);
return value;
}
- (NSArray *) decodeArrayWithError: (NSError **) error {
[JFBoxDecoder resetError: error];
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeArray) {
// The type is not array so return.
_encounteredError = YES;
[JFBoxDecoder populateError: error withCode: JFBoxDecoderErrorTypeMismatch];
return nil;
}
_index += JFBoxTypeEncodingLength;
if ([self isNilObject]) {
return nil;
}
UInt64 elementCount;
_index += [self copy: JFBoxUInt64EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &elementCount
withError: error];
if (_encounteredError) {
return nil;
}
UInt64 arrayByteLength;
_index += [self copy: JFBoxUInt64EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &arrayByteLength
withError: error];
if (_encounteredError) {
return nil;
}
NSMutableArray *array = [NSMutableArray arrayWithCapacity: elementCount];
for (UInt64 element = 0; element < elementCount; element++) {
JFBoxType elementType;
[self copy: JFBoxTypeEncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &elementType
withError: error];
if (_encounteredError) {
return nil;
}
id object = nil;
switch (elementType) {
case JFBoxTypeString:
object = [self decodeStringWithError: error];
break;
case JFBoxTypeNumber:
object = [self decodeNumberWithError: error];
break;
case JFBoxTypeDate:
object = [self decodeDateWithError: error];
break;
case JFBoxTypeData:
object = [self decodeDataWithError: error];
break;
case JFBoxTypeArray:
object = [self decodeArrayWithError: error];
break;
case JFBoxTypeDictionary:
object = [self decodeDictionaryWithError: error];
break;
case JFBoxTypeBoxEncodable:
object = [self decodeBoxEncodableWithError: error];
break;
default:
break;
}
if (_encounteredError) {
return nil;
}
if (object != nil) {
[array addObject: object];
}
}
return array;
}
- (NSDictionary *) decodeDictionaryWithError: (NSError **) error {
[JFBoxDecoder resetError: error];
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeDictionary) {
// The type is not dictionary so return.
_encounteredError = YES;
[JFBoxDecoder populateError: error withCode: JFBoxDecoderErrorTypeMismatch];
return nil;
}
_index += JFBoxTypeEncodingLength;
if ([self isNilObject]) {
return nil;
}
UInt64 elementCount;
_index += [self copy: JFBoxUInt64EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &elementCount
withError: error];
if (_encounteredError) {
// Error is already populated so just return.
return nil;
}
UInt64 dictionaryByteLength;
_index += [self copy: JFBoxUInt64EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &dictionaryByteLength
withError: error];
if (_encounteredError) {
// Error is already populated so just return.
return nil;
}
NSMutableDictionary *dictionary = [NSMutableDictionary dictionaryWithCapacity: elementCount];
for (UInt64 element = 0; element < elementCount; element++) {
// Get the key
UInt64 keyLength;
_index += [self copy: JFBoxUInt64EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &keyLength
withError: error];
if (_encounteredError) {
// Error is already populated so just return.
return nil;
}
char *keyAsCString = malloc(keyLength + 1);
keyAsCString[keyLength] = 0;
_index += [self copy: keyLength
fromIndex: _index
ofData: _data
intoBytes: keyAsCString
withError: error];
if (_encounteredError) {
// Error is already populated so just return.
free(keyAsCString);
return nil;
}
NSString *key = [NSString stringWithUTF8String: keyAsCString];
free(keyAsCString);
JFBoxType elementType;
[self copy: JFBoxTypeEncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &elementType
withError: error];
if (_encounteredError) {
// Error is already populated so just return.
return nil;
}
id object = nil;
switch (elementType) {
case JFBoxTypeString:
object = [self decodeStringWithError: error];
break;
case JFBoxTypeNumber:
object = [self decodeNumberWithError: error];
break;
case JFBoxTypeDate:
object = [self decodeDateWithError: error];
break;
case JFBoxTypeData:
object = [self decodeDataWithError: error];
break;
case JFBoxTypeArray:
object = [self decodeArrayWithError: error];
break;
case JFBoxTypeDictionary:
object = [self decodeDictionaryWithError: error];
break;
case JFBoxTypeBoxEncodable:
object = [self decodeBoxEncodableWithError: error];
break;
default:
break;
}
if (_encounteredError) {
return nil;
}
[dictionary setObject: object forKey: key];
}
return dictionary;
}
- (id <JFBoxEncodable>) decodeBoxEncodableWithError: (NSError **) error {
[JFBoxDecoder resetError: error];
JFBoxType nextType = [self nextEntryType];
if (nextType != JFBoxTypeBoxEncodable) {
// The type is not box encodable so return.
_encounteredError = YES;
[JFBoxDecoder populateError: error withCode: JFBoxDecoderErrorTypeMismatch];
return nil;
}
_index += JFBoxTypeEncodingLength;
if ([self isNilObject]) {
return nil;
}
UInt64 classNameLength;
_index += [self copy: JFBoxUInt64EncodingLength
fromIndex: _index
ofData: _data
intoBytes: (char *) &classNameLength
withError: error];
if (_encounteredError) {
return nil;
}
char *buffer = malloc(classNameLength + 1);
buffer[classNameLength] = 0;
_index += [self copy: classNameLength
fromIndex: _index
ofData: _data
intoBytes: (char *) buffer
withError: error];
if (_encounteredError) {
// Error is already populated so just return.
free(buffer);
return nil;
}
NSString *className = [NSString stringWithUTF8String: buffer];
free(buffer);
// Instantiate the class with the name...
Class boxEncodableClass = NSClassFromString(className);
if (boxEncodableClass == nil) {
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeUnsupportedBoxEncodableClassName];
return nil;
}
id instance = [[boxEncodableClass alloc] init];
[instance autorelease];
Protocol *protocol = @protocol(JFBoxEncodable);
if (![instance conformsToProtocol: protocol]) {
_encounteredError = YES;
[JFBoxDecoder populateError: error
withCode: JFBoxDecoderErrorTypeNotBoxEncodableClass];
return nil;