/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
* Jonathan Schleifer <js@heap.zone>
*
* All rights reserved.
*
* This file is part of ObjFW. It may be distributed under the terms of the
* Q Public License 1.0, which can be found in the file LICENSE.QPL included in
* the packaging of this file.
*
* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#include "config.h"
#include <string.h>
#import "OFData+MessagePackValue.h"
#import "OFNumber.h"
#import "OFNull.h"
#import "OFString.h"
#import "OFArray.h"
#import "OFDictionary.h"
#import "OFMessagePackExtension.h"
#import "OFInvalidFormatException.h"
int _OFData_MessagePackValue_reference;
static size_t parseObject(const uint8_t *buffer, size_t length, id *object,
size_t depthLimit);
static uint16_t
readUInt16(const uint8_t *buffer)
{
return ((uint16_t)buffer[0] << 8) | buffer[1];
}
static uint32_t
readUInt32(const uint8_t *buffer)
{
return ((uint32_t)buffer[0] << 24) | ((uint32_t)buffer[1] << 16) |
((uint32_t)buffer[2] << 8) | buffer[3];
}
static uint64_t
readUInt64(const uint8_t *buffer)
{
return ((uint64_t)buffer[0] << 56) | ((uint64_t)buffer[1] << 48) |
((uint64_t)buffer[2] << 40) | ((uint64_t)buffer[3] << 32) |
((uint64_t)buffer[4] << 24) | ((uint64_t)buffer[5] << 16) |
((uint64_t)buffer[6] << 8) | buffer[7];
}
static size_t
parseArray(const uint8_t *buffer, size_t length, id *object, size_t count,
size_t depthLimit)
{
void *pool;
size_t pos = 0;
if (--depthLimit == 0) {
*object = nil;
return 0;
}
/*
* Don't use capacity! For data and strings, this is safe, as we can
* check if we still have enough bytes left. For an array however, we
* can't know this, as every child can be more than one byte.
*/
*object = [OFMutableArray array];
for (size_t i = 0; i < count; i++) {
id child;
size_t childLength;
pool = objc_autoreleasePoolPush();
childLength = parseObject(buffer + pos, length - pos, &child,
depthLimit);
if (childLength == 0 || child == nil) {
objc_autoreleasePoolPop(pool);
*object = nil;
return 0;
}
pos += childLength;
[*object addObject: child];
objc_autoreleasePoolPop(pool);
}
return pos;
}
static size_t
parseTable(const uint8_t *buffer, size_t length, id *object, size_t count,
size_t depthLimit)
{
void *pool;
size_t pos = 0;
if (--depthLimit == 0) {
*object = nil;
return 0;
}
/*
* Don't use capacity! For data and strings, this is safe, as we can
* check if we still have enough bytes left. For a dictionary however,
* we can't know this, as every key / value can be more than one byte.
*/
*object = [OFMutableDictionary dictionary];
for (size_t i = 0; i < count; i++) {
id key, value;
size_t keyLength, valueLength;
pool = objc_autoreleasePoolPush();
keyLength = parseObject(buffer + pos, length - pos, &key,
depthLimit);
if (keyLength == 0 || key == nil) {
objc_autoreleasePoolPop(pool);
*object = nil;
return 0;
}
pos += keyLength;
valueLength = parseObject(buffer + pos, length - pos, &value,
depthLimit);
if (valueLength == 0 || value == nil) {
objc_autoreleasePoolPop(pool);
*object = nil;
return 0;
}
pos += valueLength;
[*object setObject: value
forKey: key];
objc_autoreleasePoolPop(pool);
}
return pos;
}
static size_t
parseObject(const uint8_t *buffer, size_t length, id *object,
size_t depthLimit)
{
size_t count;
int8_t type;
OFData *data;
if (length < 1)
goto error;
/* positive fixint */
if ((buffer[0] & 0x80) == 0) {
*object = [OFNumber numberWithUInt8: buffer[0] & 0x7F];
return 1;
}
/* negative fixint */
if ((buffer[0] & 0xE0) == 0xE0) {
*object = [OFNumber numberWithInt8:
((int8_t)(buffer[0] & 0x1F)) - 32];
return 1;
}
/* fixstr */
if ((buffer[0] & 0xE0) == 0xA0) {
count = buffer[0] & 0x1F;
if (length < count + 1)
goto error;
*object = [OFString
stringWithUTF8String: (const char *)buffer + 1
length: count];
return count + 1;
}
/* fixarray */
if ((buffer[0] & 0xF0) == 0x90)
return parseArray(buffer + 1, length - 1, object,
buffer[0] & 0xF, depthLimit) + 1;
/* fixmap */
if ((buffer[0] & 0xF0) == 0x80)
return parseTable(buffer + 1, length - 1, object,
buffer[0] & 0xF, depthLimit) + 1;
/* Prefix byte */
switch (buffer[0]) {
/* Unsigned integers */
case 0xCC: /* uint8 */
if (length < 2)
goto error;
*object = [OFNumber numberWithUInt8: buffer[1]];
return 2;
case 0xCD: /* uint 16 */
if (length < 3)
goto error;
*object = [OFNumber numberWithUInt16: readUInt16(buffer + 1)];
return 3;
case 0xCE: /* uint 32 */
if (length < 5)
goto error;
*object = [OFNumber numberWithUInt32: readUInt32(buffer + 1)];
return 5;
case 0xCF: /* uint 64 */
if (length < 9)
goto error;
*object = [OFNumber numberWithUInt64: readUInt64(buffer + 1)];
return 9;
/* Signed integers */
case 0xD0: /* int 8 */
if (length < 2)
goto error;
*object = [OFNumber numberWithInt8: buffer[1]];
return 2;
case 0xD1: /* int 16 */
if (length < 3)
goto error;
*object = [OFNumber numberWithInt16: readUInt16(buffer + 1)];
return 3;
case 0xD2: /* int 32 */
if (length < 5)
goto error;
*object = [OFNumber numberWithInt32: readUInt32(buffer + 1)];
return 5;
case 0xD3: /* int 64 */
if (length < 9)
goto error;
*object = [OFNumber numberWithInt64: readUInt64(buffer + 1)];
return 9;
/* Floating point */
case 0xCA:; /* float 32 */
union {
uint8_t u8[4];
float f;
} f;
if (length < 5)
goto error;
memcpy(&f.u8, buffer + 1, 4);
*object = [OFNumber numberWithFloat: OF_BSWAP_FLOAT_IF_LE(f.f)];
return 5;
case 0xCB:; /* float 64 */
union {
uint8_t u8[8];
double d;
} d;
if (length < 9)
goto error;
memcpy(&d.u8, buffer + 1, 8);
*object = [OFNumber numberWithDouble:
OF_BSWAP_DOUBLE_IF_LE(d.d)];
return 9;
/* nil */
case 0xC0:
*object = [OFNull null];
return 1;
/* false */
case 0xC2:
*object = [OFNumber numberWithBool: false];
return 1;
/* true */
case 0xC3:
*object = [OFNumber numberWithBool: true];
return 1;
/* Data */
case 0xC4: /* bin 8 */
if (length < 2)
goto error;
count = buffer[1];
if (length < count + 2)
goto error;
*object = [OFData dataWithItems: buffer + 2
count: count];
return count + 2;
case 0xC5: /* bin 16 */
if (length < 3)
goto error;
count = readUInt16(buffer + 1);
if (length < count + 3)
goto error;
*object = [OFData dataWithItems: buffer + 3
count: count];
return count + 3;
case 0xC6: /* bin 32 */
if (length < 5)
goto error;
count = readUInt32(buffer + 1);
if (length < count + 5)
goto error;
*object = [OFData dataWithItems: buffer + 5
count: count];
return count + 5;
/* Extensions */
case 0xC7: /* ext 8 */
if (length < 3)
goto error;
count = buffer[1];
if (length < count + 3)
goto error;
type = buffer[2];
data = [[OFData alloc] initWithItems: buffer + 3
count: count];
@try {
*object = [OFMessagePackExtension
extensionWithType: type
data: data];
} @finally {
[data release];
}
return count + 3;
case 0xC8: /* ext 16 */
if (length < 4)
goto error;
count = readUInt16(buffer + 1);
if (length < count + 4)
goto error;
type = buffer[3];
data = [[OFData alloc] initWithItems: buffer + 4
count: count];
@try {
*object = [OFMessagePackExtension
extensionWithType: type
data: data];
} @finally {
[data release];
}
return count + 4;
case 0xC9: /* ext 32 */
if (length < 6)
goto error;
count = readUInt32(buffer + 1);
if (length < count + 6)
goto error;
type = buffer[5];
data = [[OFData alloc] initWithItems: buffer + 6
count: count];
@try {
*object = [OFMessagePackExtension
extensionWithType: type
data: data];
} @finally {
[data release];
}
return count + 6;
case 0xD4: /* fixext 1 */
if (length < 3)
goto error;
type = buffer[1];
data = [[OFData alloc] initWithItems: buffer + 2
count: 1];
@try {
*object = [OFMessagePackExtension
extensionWithType: type
data: data];
} @finally {
[data release];
}
return 3;
case 0xD5: /* fixext 2 */
if (length < 4)
goto error;
type = buffer[1];
data = [[OFData alloc] initWithItems: buffer + 2
count: 2];
@try {
*object = [OFMessagePackExtension
extensionWithType: type
data: data];
} @finally {
[data release];
}
return 4;
case 0xD6: /* fixext 4 */
if (length < 6)
goto error;
type = buffer[1];
data = [[OFData alloc] initWithItems: buffer + 2
count: 4];
@try {
*object = [OFMessagePackExtension
extensionWithType: type
data: data];
} @finally {
[data release];
}
return 6;
case 0xD7: /* fixext 8 */
if (length < 10)
goto error;
type = buffer[1];
data = [[OFData alloc] initWithItems: buffer + 2
count: 8];
@try {
*object = [OFMessagePackExtension
extensionWithType: type
data: data];
} @finally {
[data release];
}
return 10;
case 0xD8: /* fixext 16 */
if (length < 18)
goto error;
type = buffer[1];
data = [[OFData alloc] initWithItems: buffer + 2
count: 16];
@try {
*object = [OFMessagePackExtension
extensionWithType: type
data: data];
} @finally {
[data release];
}
return 18;
/* Strings */
case 0xD9: /* str 8 */
if (length < 2)
goto error;
count = buffer[1];
if (length < count + 2)
goto error;
*object = [OFString
stringWithUTF8String: (const char *)buffer + 2
length: count];
return count + 2;
case 0xDA: /* str 16 */
if (length < 3)
goto error;
count = readUInt16(buffer + 1);
if (length < count + 3)
goto error;
*object = [OFString
stringWithUTF8String: (const char *)buffer + 3
length: count];
return count + 3;
case 0xDB: /* str 32 */
if (length < 5)
goto error;
count = readUInt32(buffer + 1);
if (length < count + 5)
goto error;
*object = [OFString
stringWithUTF8String: (const char *)buffer + 5
length: count];
return count + 5;
/* Arrays */
case 0xDC: /* array 16 */
if (length < 3)
goto error;
return parseArray(buffer + 3, length - 3, object,
readUInt16(buffer + 1), depthLimit) + 3;
case 0xDD: /* array 32 */
if (length < 5)
goto error;
return parseArray(buffer + 5, length - 5, object,
readUInt32(buffer + 1), depthLimit) + 5;
/* Maps */
case 0xDE: /* map 16 */
if (length < 3)
goto error;
return parseTable(buffer + 3, length - 3, object,
readUInt16(buffer + 1), depthLimit) + 3;
case 0xDF: /* map 32 */
if (length < 5)
goto error;
return parseTable(buffer + 5, length - 5, object,
readUInt32(buffer + 1), depthLimit) + 5;
}
error:
*object = nil;
return 0;
}
@implementation OFData (MessagePackValue)
- (id)messagePackValue
{
return [self messagePackValueWithDepthLimit: 32];
}
- (id)messagePackValueWithDepthLimit: (size_t)depthLimit
{
void *pool = objc_autoreleasePoolPush();
size_t count = [self count];
id object;
if (parseObject([self items], count, &object, depthLimit) != count ||
object == nil)
@throw [OFInvalidFormatException exception];
[object retain];
objc_autoreleasePoolPop(pool);
return object;
}
@end