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mpack-objc.m
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mpack-objc.m
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/*
* Copyright (c) 2015 Nicholas Fraser
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#define MPACK_INTERNAL 1
#import "mpack-objc.h"
#if !MPACK_STDLIB
#error "MPack Objective-C bindings require the C stdlib."
#endif
// Toll-free bridging doesn't currently work on GNUstep
#ifndef GNUSTEP_BASE_VERSION
#define MPACK_OBJC_TOLL_FREE_BRIDGE 1
#else
#define MPACK_OBJC_TOLL_FREE_BRIDGE 0
#endif
#if MPACK_OBJC_TOLL_FREE_BRIDGE
#import <CoreFoundation/CoreFoundation.h>
#endif
// We support both ARC and manual refcounting
#if __has_feature(objc_arc)
#define MPACK_OBJC_RELEASE(x) ((void)(x))
#define MPACK_OBJC_AUTORELEASE(x) (x)
#else
#define MPACK_OBJC_RELEASE(x) ((void)[(x) release])
#define MPACK_OBJC_AUTORELEASE(x) ([(x) autorelease])
#endif
#define MPACK_OBJC_SMALL_COMPOUND 16
#if MPACK_WRITER
@interface MPackError : NSError
@end
@implementation MPackError
+ (MPackError*)errorWithMPackError:(mpack_error_t)error {
return [MPackError errorWithDomain:mpack_nserror_domain code:(NSInteger)error userInfo:nil];
}
- (NSString*)localizedDescription {
return [NSString stringWithUTF8String:mpack_error_to_string((mpack_error_t)[self code])];
}
@end
#endif
#if MPACK_READER
NSString* mpack_read_nsstring(mpack_reader_t* reader, size_t length) {
if (mpack_reader_error(reader) != mpack_ok)
return @"";
// small string
if (mpack_should_read_bytes_inplace(reader, length)) {
const char* bytes = mpack_read_utf8_inplace(reader, length);
if (mpack_reader_error(reader) != mpack_ok)
return @"";
return MPACK_OBJC_AUTORELEASE([[NSString alloc] initWithBytes:(const void*)bytes length:length encoding:NSUTF8StringEncoding]);
}
// long string
char* bytes = (char*)mpack_stdlib_malloc(length);
if (bytes == NULL) {
mpack_reader_flag_error(reader, mpack_error_memory);
return @"";
}
mpack_read_utf8(reader, bytes, length);
if (mpack_reader_error(reader) != mpack_ok)
return @"";
return MPACK_OBJC_AUTORELEASE([[NSString alloc] initWithBytesNoCopy:(void*)bytes
length:length encoding:NSUTF8StringEncoding freeWhenDone:YES]);
}
NSData* mpack_read_nsdata(mpack_reader_t* reader, size_t count) {
// small data
if (mpack_should_read_bytes_inplace(reader, count)) {
const char* bytes = mpack_read_bytes_inplace(reader, count);
if (mpack_reader_error(reader) != mpack_ok)
return [NSData data];
return [NSData dataWithBytes:(const void*)bytes length:count];
}
// big data
NSMutableData* mdata = [NSMutableData dataWithLength:count];
mpack_read_bytes(reader, (char*)[mdata mutableBytes], count);
if (mpack_reader_error(reader) != mpack_ok)
return [NSData data];
return mdata;
}
#endif
#if MPACK_EXPECT
NSString* mpack_expect_nsstring(mpack_reader_t* reader, size_t maxsize) {
size_t length = mpack_expect_str_max(reader, (uint32_t)maxsize);
NSString *str = mpack_read_nsstring(reader, length);
mpack_done_str(reader);
return str;
}
NSData* mpack_expect_bin_nsdata(mpack_reader_t* reader, size_t maxsize) {
size_t count = mpack_expect_bin_max(reader, (uint32_t)maxsize);
NSData *data = mpack_read_nsdata(reader, count);
mpack_done_bin(reader);
return data;
}
#endif
#if MPACK_NODE
NSString* mpack_node_nsstring(mpack_node_t node, size_t maxsize) {
if (mpack_node_strlen(node) > maxsize) {
mpack_node_flag_error(node, mpack_error_too_big);
return @"";
}
mpack_node_check_utf8(node);
if (mpack_node_error(node) != mpack_ok)
return @"";
size_t count = (size_t)node.data->len;
const char* bytes = node.data->value.bytes;
return MPACK_OBJC_AUTORELEASE([[NSString alloc] initWithBytes:(const void*)bytes
length:count encoding:NSUTF8StringEncoding]);
}
NSData* mpack_node_bin_nsdata(mpack_node_t node, size_t maxsize) {
if (mpack_node_error(node) != mpack_ok)
return [NSData data];
if (node.data->type != mpack_type_bin) {
mpack_node_flag_error(node, mpack_error_type);
return [NSData data];
}
size_t count = (size_t)node.data->len;
const char* bytes = node.data->value.bytes;
if (count > maxsize) {
mpack_node_flag_error(node, mpack_error_too_big);
return [NSData data];
}
return [NSData dataWithBytes:(const void*)bytes length:count];
}
#endif
#if MPACK_WRITER
@implementation NSObject (MPackEncoding)
- (NSData*)encodeMPack {
return [self encodeMPackWithError:NULL];
}
- (NSData*)encodeMPackWithError:(NSError**)error_out {
if (error_out)
*error_out = nil;
// initialize a growable writer
mpack_writer_t writer;
char* data;
size_t size;
mpack_writer_init_growable(&writer, &data, &size);
// write data
[self writeMPack:&writer];
// clean up
mpack_error_t error = mpack_writer_destroy(&writer);
if (error_out)
*error_out = [MPackError errorWithMPackError:error];
if (error != mpack_ok)
return nil;
// convert to NSData
// TODO: We don't know that MPACK_MALLOC is actually malloc, so for now we just
// copy it. This should probably be implemented with [NSMutableData -appendBytes:].
NSData* nsdata = [NSData dataWithBytes:data length:size];
MPACK_FREE(data);
if (!nsdata && error_out)
*error_out = [MPackError errorWithMPackError:mpack_error_memory];
return nsdata;
}
- (void)writeMPack:(mpack_writer_t*)writer {
mpack_break("-writeMPack is not implemented on %s", [NSStringFromClass([self class]) UTF8String]);
mpack_writer_flag_error(writer, mpack_error_bug);
}
@end
@interface NSDictionary (MPackEncoding)
- (void)writeMPack:(mpack_writer_t*)writer;
@end
@implementation NSDictionary (MPackEncoding)
- (void)writeMPack:(mpack_writer_t*)writer {
mpack_start_map(writer, (uint32_t)[self count]);
for (id key in self) {
if (mpack_writer_error(writer) != mpack_ok) return;
[key writeMPack:writer];
[[self objectForKey:key] writeMPack:writer];
}
mpack_finish_map(writer);
}
@end
@interface NSArray (MPackEncoding)
- (void)writeMPack:(mpack_writer_t*)writer;
@end
@implementation NSArray (MPackEncoding)
- (void)writeMPack:(mpack_writer_t*)writer {
mpack_start_array(writer, (uint32_t)[self count]);
for (id element in self) {
if (mpack_writer_error(writer) != mpack_ok) return;
[element writeMPack:writer];
}
mpack_finish_array(writer);
}
@end
@interface NSString (MPackEncoding)
- (void)writeMPack:(mpack_writer_t*)writer;
@end
@implementation NSString (MPackEncoding)
- (void)writeMPack:(mpack_writer_t*)writer {
// TODO length check uint32
mpack_write_str(writer, [self UTF8String], (uint32_t)[self length]);
}
@end
@interface NSData (MPackEncoding)
- (void)writeMPack:(mpack_writer_t*)writer;
@end
@implementation NSData (MPackEncoding)
- (void)writeMPack:(mpack_writer_t*)writer {
if ([self length] > UINT32_MAX) {
mpack_writer_flag_error(writer, mpack_error_too_big);
return;
}
mpack_write_bin(writer, (const char*)[self bytes], (uint32_t)[self length]);
}
@end
@interface NSNull (MPackEncoding)
- (void)writeMPack:(mpack_writer_t*)writer;
@end
@implementation NSNull (MPackEncoding)
- (void)writeMPack:(mpack_writer_t*)writer {
mpack_write_nil(writer);
}
@end
@interface NSNumber (MPackEncoding)
- (void)writeMPack:(mpack_writer_t*)writer;
@end
@implementation NSNumber (MPackEncoding)
- (void)writeMPack:(mpack_writer_t*)writer {
// Boolean values are implemented as singletons in Objective-C.
if ((id)self == (id)@(YES)) {
mpack_write_true(writer);
return;
}
if ((id)self == (id)@(NO)) {
mpack_write_false(writer);
return;
}
#if MPACK_OBJC_TOLL_FREE_BRIDGE
CFNumberRef ref = (CFNumberRef)self;
// Try to recognize the type exactly
switch (CFNumberGetType(ref)) {
case kCFNumberSInt8Type:
case kCFNumberSInt16Type:
case kCFNumberSInt32Type:
case kCFNumberCharType:
case kCFNumberShortType:
case kCFNumberIntType:
mpack_write_i32(writer, [self intValue]);
return;
case kCFNumberSInt64Type:
case kCFNumberLongLongType:
mpack_write_i64(writer, [self longLongValue]);
return;
case kCFNumberLongType:
if (sizeof(long) == sizeof(int32_t)) {
mpack_write_i32(writer, [self intValue]);
} else {
mpack_write_i64(writer, [self longLongValue]);
}
return;
case kCFNumberNSIntegerType:
if (sizeof(NSInteger) == sizeof(int32_t)) {
mpack_write_i32(writer, [self intValue]);
} else {
mpack_write_i64(writer, [self longLongValue]);
}
return;
case kCFNumberCFIndexType:
if (sizeof(CFIndex) == sizeof(int32_t)) {
mpack_write_i32(writer, [self intValue]);
} else {
mpack_write_i64(writer, [self longLongValue]);
}
return;
case kCFNumberFloat32Type:
case kCFNumberFloatType:
mpack_write_float(writer, [self floatValue]);
return;
case kCFNumberFloat64Type:
case kCFNumberDoubleType:
mpack_write_double(writer, [self doubleValue]);
return;
case kCFNumberCGFloatType:
if (sizeof(CGFloat) == sizeof(float)) {
mpack_write_float(writer, [self floatValue]);
} else {
mpack_write_double(writer, [self doubleValue]);
}
return;
default:
break;
}
// Check if we're some special float type
if (CFNumberIsFloatType(ref)) {
mpack_write_double(writer, [self doubleValue]);
return;
}
#else
// Handle floats
const char* type = [self objCType];
if (strcmp(type, @encode(float)) == 0) {
mpack_write_float(writer, [self floatValue]);
return;
}
if (strcmp(type, @encode(double)) == 0) {
mpack_write_double(writer, [self doubleValue]);
return;
}
#endif
// Fall back to a safe int writer. This allows us to handle numbers
// in the range (INT64_MAX,UINT64_MAX] (since they are internally
// stored as a 128-bit signed number). We just do an extra sign
// check to make sure it's safe.
if ([self compare:@(0)] == NSOrderedAscending) {
mpack_write_i64(writer, [self longLongValue]);
return;
}
mpack_write_u64(writer, [self unsignedLongLongValue]);
}
@end
#endif