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CFBinaryPList.c
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CFBinaryPList.c
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/*
* Copyright (c) 2015 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
/* CFBinaryPList.c
Copyright (c) 2000-2014, Apple Inc. All rights reserved.
Responsibility: Tony Parker
*/
#include <CoreFoundation/CFString.h>
#include <CoreFoundation/CFNumber.h>
#include <CoreFoundation/CFDate.h>
#include <CoreFoundation/CFData.h>
#include <CoreFoundation/CFError.h>
#include <CoreFoundation/CFArray.h>
#include <CoreFoundation/CFDictionary.h>
#include <CoreFoundation/CFSet.h>
#include <CoreFoundation/CFPropertyList.h>
#include <CoreFoundation/CFByteOrder.h>
#include <CoreFoundation/CFRuntime.h>
#include <CoreFoundation/CFUUID.h>
#include <stdio.h>
#include <limits.h>
#include <string.h>
#include "CFInternal.h"
#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_WINDOWS
#include <CoreFoundation/CFStream.h>
#endif
typedef struct {
int64_t high;
uint64_t low;
} CFSInt128Struct;
enum {
kCFNumberSInt128Type = 17
};
enum {
CF_NO_ERROR = 0,
CF_OVERFLOW_ERROR = (1 << 0),
};
CF_INLINE uint64_t __check_uint64_add_unsigned_unsigned(uint64_t x, uint64_t y, int32_t* err) {
if((ULLONG_MAX - y) < x)
*err = *err | CF_OVERFLOW_ERROR;
return x + y;
};
CF_INLINE uint64_t __check_uint64_mul_unsigned_unsigned(uint64_t x, uint64_t y, int32_t* err) {
if(x == 0) return 0;
if(ULLONG_MAX/x < y)
*err = *err | CF_OVERFLOW_ERROR;
return x * y;
};
#if __LP64__
#define check_ptr_add(p, a, err) (const uint8_t *)__check_uint64_add_unsigned_unsigned((uintptr_t)p, (uintptr_t)a, err)
#define check_size_t_mul(b, a, err) (size_t)__check_uint64_mul_unsigned_unsigned((size_t)b, (size_t)a, err)
#else
CF_INLINE uint32_t __check_uint32_add_unsigned_unsigned(uint32_t x, uint32_t y, int32_t* err) {
if((UINT_MAX - y) < x)
*err = *err | CF_OVERFLOW_ERROR;
return x + y;
};
CF_INLINE uint32_t __check_uint32_mul_unsigned_unsigned(uint32_t x, uint32_t y, int32_t* err) {
uint64_t tmp = (uint64_t) x * (uint64_t) y;
/* If any of the upper 32 bits touched, overflow */
if(tmp & 0xffffffff00000000ULL)
*err = *err | CF_OVERFLOW_ERROR;
return (uint32_t) tmp;
};
#define check_ptr_add(p, a, err) (const uint8_t *)__check_uint32_add_unsigned_unsigned((uintptr_t)p, (uintptr_t)a, err)
#define check_size_t_mul(b, a, err) (size_t)__check_uint32_mul_unsigned_unsigned((size_t)b, (size_t)a, err)
#endif
#pragma mark -
#pragma mark Keyed Archiver UID
struct __CFKeyedArchiverUID {
CFRuntimeBase _base;
uint32_t _value;
};
static CFStringRef __CFKeyedArchiverUIDCopyDescription(CFTypeRef cf) {
CFKeyedArchiverUIDRef uid = (CFKeyedArchiverUIDRef)cf;
return CFStringCreateWithFormat(kCFAllocatorSystemDefault, NULL, CFSTR("<CFKeyedArchiverUID %p [%p]>{value = %u}"), cf, CFGetAllocator(cf), uid->_value);
}
static CFStringRef __CFKeyedArchiverUIDCopyFormattingDescription(CFTypeRef cf, CFDictionaryRef formatOptions) {
CFKeyedArchiverUIDRef uid = (CFKeyedArchiverUIDRef)cf;
return CFStringCreateWithFormat(kCFAllocatorSystemDefault, NULL, CFSTR("@%u@"), uid->_value);
}
static CFTypeID __kCFKeyedArchiverUIDTypeID = _kCFRuntimeNotATypeID;
static const CFRuntimeClass __CFKeyedArchiverUIDClass = {
0,
"CFKeyedArchiverUID",
NULL, // init
NULL, // copy
NULL, // finalize
NULL, // equal -- pointer equality only
NULL, // hash -- pointer hashing only
__CFKeyedArchiverUIDCopyFormattingDescription,
__CFKeyedArchiverUIDCopyDescription
};
CFTypeID _CFKeyedArchiverUIDGetTypeID(void) {
static dispatch_once_t initOnce;
dispatch_once(&initOnce, ^{ __kCFKeyedArchiverUIDTypeID = _CFRuntimeRegisterClass(&__CFKeyedArchiverUIDClass); });
return __kCFKeyedArchiverUIDTypeID;
}
CFKeyedArchiverUIDRef _CFKeyedArchiverUIDCreate(CFAllocatorRef allocator, uint32_t value) {
CFKeyedArchiverUIDRef uid;
uid = (CFKeyedArchiverUIDRef)_CFRuntimeCreateInstance(allocator, _CFKeyedArchiverUIDGetTypeID(), sizeof(struct __CFKeyedArchiverUID) - sizeof(CFRuntimeBase), NULL);
if (NULL == uid) {
return NULL;
}
((struct __CFKeyedArchiverUID *)uid)->_value = value;
return uid;
}
uint32_t _CFKeyedArchiverUIDGetValue(CFKeyedArchiverUIDRef uid) {
return uid->_value;
}
#pragma mark -
#pragma mark Writing
CF_PRIVATE CFErrorRef __CFPropertyListCreateError(CFIndex code, CFStringRef debugString, ...);
typedef struct {
CFTypeRef stream;
void *databytes;
uint64_t datalen;
CFErrorRef error;
uint64_t written;
int32_t used;
bool streamIsData;
uint8_t buffer[8192 - 32];
} __CFBinaryPlistWriteBuffer;
static void writeBytes(__CFBinaryPlistWriteBuffer *buf, const UInt8 *bytes, CFIndex length) {
if (length <= 0) return;
if (buf->error) return;
if (buf->databytes) {
int32_t err = CF_NO_ERROR;
uint64_t tmpSum = __check_uint64_add_unsigned_unsigned(buf->written, (uint64_t)length, &err);
if ((CF_NO_ERROR != err) || buf->datalen < tmpSum) {
buf->error = __CFPropertyListCreateError(kCFPropertyListWriteStreamError, CFSTR("Binary property list writing could not be completed because databytes is full."));
return;
}
memmove((char *)buf->databytes + buf->written, bytes, length);
}
if (buf->streamIsData) {
if (buf->stream) CFDataAppendBytes((CFMutableDataRef)buf->stream, bytes, length);
buf->written += length;
} else {
#if DEPLOYMENT_TARGET_MACOSX || DEPLOYMENT_TARGET_EMBEDDED || DEPLOYMENT_TARGET_WINDOWS
while (0 < length) {
CFIndex ret = buf->stream ? CFWriteStreamWrite((CFWriteStreamRef)buf->stream, bytes, length) : length;
if (ret == 0) {
buf->error = __CFPropertyListCreateError(kCFPropertyListWriteStreamError, CFSTR("Binary property list writing could not be completed because stream is full."));
return;
}
if (ret < 0) {
CFErrorRef err = buf->stream ? CFWriteStreamCopyError((CFWriteStreamRef)buf->stream) : NULL;
buf->error = err ? err : __CFPropertyListCreateError(kCFPropertyListWriteStreamError, CFSTR("Binary property list writing could not be completed because the stream had an unknown error."));
return;
}
buf->written += ret;
length -= ret;
bytes += ret;
}
#else
CFAssert(false, __kCFLogAssertion, "Streams are not supported on this platform");
#endif
}
}
static void bufferFlush(__CFBinaryPlistWriteBuffer *buf) {
writeBytes(buf, buf->buffer, buf->used);
buf->used = 0;
}
static void bufferWrite(__CFBinaryPlistWriteBuffer *buf, const uint8_t *buffer, CFIndex count) {
if (0 == count) return;
if ((CFIndex)sizeof(buf->buffer) <= count) {
bufferFlush(buf);
writeBytes(buf, buffer, count);
return;
}
CFIndex copyLen = __CFMin(count, (CFIndex)sizeof(buf->buffer) - buf->used);
if (buf->stream || buf->databytes) {
switch (copyLen) {
case 4: buf->buffer[buf->used + 3] = buffer[3]; /* FALLTHROUGH */
case 3: buf->buffer[buf->used + 2] = buffer[2]; /* FALLTHROUGH */
case 2: buf->buffer[buf->used + 1] = buffer[1]; /* FALLTHROUGH */
case 1: buf->buffer[buf->used] = buffer[0]; break;
default: memmove(buf->buffer + buf->used, buffer, copyLen);
}
}
buf->used += copyLen;
if (sizeof(buf->buffer) == buf->used) {
writeBytes(buf, buf->buffer, sizeof(buf->buffer));
if (buf->stream || buf->databytes) {
memmove(buf->buffer, buffer + copyLen, count - copyLen);
}
buf->used = count - copyLen;
}
}
/*
HEADER
magic number ("bplist")
file format version (currently "0?")
OBJECT TABLE
variable-sized objects
Object Formats (marker byte followed by additional info in some cases)
null 0000 0000 // null object [v"1?"+ only]
bool 0000 1000 // false
bool 0000 1001 // true
url 0000 1100 string // URL with no base URL, recursive encoding of URL string [v"1?"+ only]
url 0000 1101 base string // URL with base URL, recursive encoding of base URL, then recursive encoding of URL string [v"1?"+ only]
uuid 0000 1110 // 16-byte UUID [v"1?"+ only]
fill 0000 1111 // fill byte
int 0001 0nnn ... // # of bytes is 2^nnn, big-endian bytes
real 0010 0nnn ... // # of bytes is 2^nnn, big-endian bytes
date 0011 0011 ... // 8 byte float follows, big-endian bytes
data 0100 nnnn [int] ... // nnnn is number of bytes unless 1111 then int count follows, followed by bytes
string 0101 nnnn [int] ... // ASCII string, nnnn is # of chars, else 1111 then int count, then bytes
string 0110 nnnn [int] ... // Unicode string, nnnn is # of chars, else 1111 then int count, then big-endian 2-byte uint16_t
string 0111 nnnn [int] ... // UTF8 string, nnnn is # of chars, else 1111 then int count, then bytes [v"1?"+ only]
uid 1000 nnnn ... // nnnn+1 is # of bytes
1001 xxxx // unused
array 1010 nnnn [int] objref* // nnnn is count, unless '1111', then int count follows
ordset 1011 nnnn [int] objref* // nnnn is count, unless '1111', then int count follows [v"1?"+ only]
set 1100 nnnn [int] objref* // nnnn is count, unless '1111', then int count follows [v"1?"+ only]
dict 1101 nnnn [int] keyref* objref* // nnnn is count, unless '1111', then int count follows
1110 xxxx // unused
1111 xxxx // unused
OFFSET TABLE
list of ints, byte size of which is given in trailer
-- these are the byte offsets into the file
-- number of these is in the trailer
TRAILER
byte size of offset ints in offset table
byte size of object refs in arrays and dicts
number of offsets in offset table (also is number of objects)
element # in offset table which is top level object
offset table offset
*/
static CFTypeID stringtype = -1, datatype = -1, numbertype = -1, datetype = -1;
static CFTypeID booltype = -1, nulltype = -1, dicttype = -1, arraytype = -1;
static CFTypeID uuidtype = -1, urltype = -1, osettype = -1, settype = -1;
static void initStatics() {
if ((CFTypeID)-1 == stringtype) {
stringtype = CFStringGetTypeID();
}
if ((CFTypeID)-1 == datatype) {
datatype = CFDataGetTypeID();
}
if ((CFTypeID)-1 == numbertype) {
numbertype = CFNumberGetTypeID();
}
if ((CFTypeID)-1 == booltype) {
booltype = CFBooleanGetTypeID();
}
if ((CFTypeID)-1 == datetype) {
datetype = CFDateGetTypeID();
}
if ((CFTypeID)-1 == dicttype) {
dicttype = CFDictionaryGetTypeID();
}
if ((CFTypeID)-1 == arraytype) {
arraytype = CFArrayGetTypeID();
}
if ((CFTypeID)-1 == settype) {
settype = CFSetGetTypeID();
}
if ((CFTypeID)-1 == nulltype) {
nulltype = CFNullGetTypeID();
}
if ((CFTypeID)-1 == uuidtype) {
uuidtype = CFUUIDGetTypeID();
}
if ((CFTypeID)-1 == urltype) {
urltype = CFURLGetTypeID();
}
if ((CFTypeID)-1 == osettype) {
osettype = -1;
}
}
static void _appendInt(__CFBinaryPlistWriteBuffer *buf, uint64_t bigint) {
uint8_t marker;
uint8_t *bytes;
CFIndex nbytes;
if (bigint <= (uint64_t)0xff) {
nbytes = 1;
marker = kCFBinaryPlistMarkerInt | 0;
} else if (bigint <= (uint64_t)0xffff) {
nbytes = 2;
marker = kCFBinaryPlistMarkerInt | 1;
} else if (bigint <= (uint64_t)0xffffffff) {
nbytes = 4;
marker = kCFBinaryPlistMarkerInt | 2;
} else {
nbytes = 8;
marker = kCFBinaryPlistMarkerInt | 3;
}
bigint = CFSwapInt64HostToBig(bigint);
bytes = (uint8_t *)&bigint + sizeof(bigint) - nbytes;
bufferWrite(buf, &marker, 1);
bufferWrite(buf, bytes, nbytes);
}
static void _appendUID(__CFBinaryPlistWriteBuffer *buf, CFKeyedArchiverUIDRef uid) {
uint8_t marker;
uint8_t *bytes;
CFIndex nbytes;
uint64_t bigint = _CFKeyedArchiverUIDGetValue(uid);
if (bigint <= (uint64_t)0xff) {
nbytes = 1;
} else if (bigint <= (uint64_t)0xffff) {
nbytes = 2;
} else if (bigint <= (uint64_t)0xffffffff) {
nbytes = 4;
} else {
nbytes = 8;
}
marker = kCFBinaryPlistMarkerUID | (uint8_t)(nbytes - 1);
bigint = CFSwapInt64HostToBig(bigint);
bytes = (uint8_t *)&bigint + sizeof(bigint) - nbytes;
bufferWrite(buf, &marker, 1);
bufferWrite(buf, bytes, nbytes);
}
static void _appendString(__CFBinaryPlistWriteBuffer *buf, CFStringRef str) {
CFIndex ret, count = CFStringGetLength(str);
CFIndex needed, idx2;
uint8_t *bytes, buffer[1024];
bytes = (count <= 1024) ? buffer : (uint8_t *)CFAllocatorAllocate(kCFAllocatorSystemDefault, count, 0);
// presumption, believed to be true, is that ASCII encoding may need
// less bytes, but will not need greater, than the # of unichars
ret = CFStringGetBytes(str, CFRangeMake(0, count), kCFStringEncodingASCII, 0, false, bytes, count, &needed);
if (ret == count) {
uint8_t marker = (uint8_t)(kCFBinaryPlistMarkerASCIIString | (needed < 15 ? needed : 0xf));
bufferWrite(buf, &marker, 1);
if (15 <= needed) {
_appendInt(buf, (uint64_t)needed);
}
bufferWrite(buf, bytes, needed);
} else {
UniChar *chars;
uint8_t marker = (uint8_t)(kCFBinaryPlistMarkerUnicode16String | (count < 15 ? count : 0xf));
bufferWrite(buf, &marker, 1);
if (15 <= count) {
_appendInt(buf, (uint64_t)count);
}
chars = (UniChar *)CFAllocatorAllocate(kCFAllocatorSystemDefault, count * sizeof(UniChar), 0);
CFStringGetCharacters(str, CFRangeMake(0, count), chars);
for (idx2 = 0; idx2 < count; idx2++) {
chars[idx2] = CFSwapInt16HostToBig(chars[idx2]);
}
bufferWrite(buf, (uint8_t *)chars, count * sizeof(UniChar));
CFAllocatorDeallocate(kCFAllocatorSystemDefault, chars);
}
if (bytes != buffer) CFAllocatorDeallocate(kCFAllocatorSystemDefault, bytes);
}
CF_EXPORT CFNumberType _CFNumberGetType2(CFNumberRef number);
static void _appendNumber(__CFBinaryPlistWriteBuffer *buf, CFNumberRef num) {
uint8_t marker;
uint64_t bigint;
uint8_t *bytes;
CFIndex nbytes;
if (CFNumberIsFloatType(num)) {
CFSwappedFloat64 swapped64;
CFSwappedFloat32 swapped32;
if (CFNumberGetByteSize(num) <= (CFIndex)sizeof(float)) {
float v;
CFNumberGetValue(num, kCFNumberFloat32Type, &v);
swapped32 = CFConvertFloat32HostToSwapped(v);
bytes = (uint8_t *)&swapped32;
nbytes = sizeof(float);
marker = kCFBinaryPlistMarkerReal | 2;
} else {
double v;
CFNumberGetValue(num, kCFNumberFloat64Type, &v);
swapped64 = CFConvertFloat64HostToSwapped(v);
bytes = (uint8_t *)&swapped64;
nbytes = sizeof(double);
marker = kCFBinaryPlistMarkerReal | 3;
}
bufferWrite(buf, &marker, 1);
bufferWrite(buf, bytes, nbytes);
} else {
CFNumberType type = _CFNumberGetType2(num);
if (kCFNumberSInt128Type == type) {
CFSInt128Struct s;
CFNumberGetValue(num, kCFNumberSInt128Type, &s);
struct {
int64_t high;
uint64_t low;
} storage;
storage.high = CFSwapInt64HostToBig(s.high);
storage.low = CFSwapInt64HostToBig(s.low);
uint8_t *bytes = (uint8_t *)&storage;
uint8_t marker = kCFBinaryPlistMarkerInt | 4;
CFIndex nbytes = 16;
bufferWrite(buf, &marker, 1);
bufferWrite(buf, bytes, nbytes);
} else {
CFNumberGetValue(num, kCFNumberSInt64Type, &bigint);
_appendInt(buf, bigint);
}
}
}
static Boolean _appendObject(__CFBinaryPlistWriteBuffer *buf, CFTypeRef obj, CFDictionaryRef objtable, uint32_t objRefSize) {
uint64_t refnum;
CFIndex idx2;
CFTypeID type = CFGetTypeID(obj);
if (stringtype == type) {
_appendString(buf, (CFStringRef)obj);
} else if (numbertype == type) {
_appendNumber(buf, (CFNumberRef)obj);
} else if (booltype == type) {
uint8_t marker = CFBooleanGetValue((CFBooleanRef)obj) ? kCFBinaryPlistMarkerTrue : kCFBinaryPlistMarkerFalse;
bufferWrite(buf, &marker, 1);
} else if (datatype == type) {
CFIndex count = CFDataGetLength((CFDataRef)obj);
uint8_t marker = (uint8_t)(kCFBinaryPlistMarkerData | (count < 15 ? count : 0xf));
bufferWrite(buf, &marker, 1);
if (15 <= count) {
_appendInt(buf, (uint64_t)count);
}
bufferWrite(buf, CFDataGetBytePtr((CFDataRef)obj), count);
} else if (datetype == type) {
CFSwappedFloat64 swapped;
uint8_t marker = kCFBinaryPlistMarkerDate;
bufferWrite(buf, &marker, 1);
swapped = CFConvertFloat64HostToSwapped(CFDateGetAbsoluteTime((CFDateRef)obj));
bufferWrite(buf, (uint8_t *)&swapped, sizeof(swapped));
} else if (dicttype == type) {
CFIndex count = CFDictionaryGetCount((CFDictionaryRef)obj);
uint8_t marker = (uint8_t)(kCFBinaryPlistMarkerDict | (count < 15 ? count : 0xf));
bufferWrite(buf, &marker, 1);
if (15 <= count) {
_appendInt(buf, (uint64_t)count);
}
CFPropertyListRef *list, buffer[512];
list = (count <= 256) ? buffer : (CFPropertyListRef *)CFAllocatorAllocate(kCFAllocatorSystemDefault, 2 * count * sizeof(CFTypeRef), __kCFAllocatorGCScannedMemory);
CFDictionaryGetKeysAndValues((CFDictionaryRef)obj, list, list + count);
for (idx2 = 0; idx2 < 2 * count; idx2++) {
CFPropertyListRef value = list[idx2];
if (objtable) {
uint32_t swapped = 0;
uint8_t *source = (uint8_t *)&swapped;
refnum = (uint32_t)(uintptr_t)CFDictionaryGetValue(objtable, value);
swapped = CFSwapInt32HostToBig((uint32_t)refnum);
bufferWrite(buf, source + sizeof(swapped) - objRefSize, objRefSize);
} else {
Boolean ret = _appendObject(buf, value, objtable, objRefSize);
if (!ret) {
if (list != buffer) CFAllocatorDeallocate(kCFAllocatorSystemDefault, list);
return false;
}
}
}
if (list != buffer) CFAllocatorDeallocate(kCFAllocatorSystemDefault, list);
} else if (arraytype == type) {
CFIndex count = CFArrayGetCount((CFArrayRef)obj);
CFPropertyListRef *list, buffer[256];
uint8_t marker = (uint8_t)(kCFBinaryPlistMarkerArray | (count < 15 ? count : 0xf));
bufferWrite(buf, &marker, 1);
if (15 <= count) {
_appendInt(buf, (uint64_t)count);
}
list = (count <= 256) ? buffer : (CFPropertyListRef *)CFAllocatorAllocate(kCFAllocatorSystemDefault, count * sizeof(CFTypeRef), __kCFAllocatorGCScannedMemory);
CFArrayGetValues((CFArrayRef)obj, CFRangeMake(0, count), list);
for (idx2 = 0; idx2 < count; idx2++) {
CFPropertyListRef value = list[idx2];
if (objtable) {
uint32_t swapped = 0;
uint8_t *source = (uint8_t *)&swapped;
refnum = (uint32_t)(uintptr_t)CFDictionaryGetValue(objtable, value);
swapped = CFSwapInt32HostToBig((uint32_t)refnum);
bufferWrite(buf, source + sizeof(swapped) - objRefSize, objRefSize);
} else {
Boolean ret = _appendObject(buf, value, objtable, objRefSize);
if (!ret) {
if (list != buffer) CFAllocatorDeallocate(kCFAllocatorSystemDefault, list);
return false;
}
}
}
if (list != buffer) CFAllocatorDeallocate(kCFAllocatorSystemDefault, list);
} else if (_CFKeyedArchiverUIDGetTypeID() == type) {
_appendUID(buf, (CFKeyedArchiverUIDRef)obj);
} else {
return false;
}
return true;
}
static void _flattenPlist(CFPropertyListRef plist, CFMutableArrayRef objlist, CFMutableDictionaryRef objtable, CFMutableSetRef uniquingset) {
uint32_t refnum;
CFTypeID type = CFGetTypeID(plist);
// Do not unique dictionaries or arrays, because: they
// are slow to compare, and have poor hash codes.
// Uniquing bools is unnecessary.
if (stringtype == type || numbertype == type || datetype == type || datatype == type) {
CFIndex before = CFSetGetCount(uniquingset);
CFSetAddValue(uniquingset, plist);
CFIndex after = CFSetGetCount(uniquingset);
if (after == before) { // already in set
CFPropertyListRef unique = CFSetGetValue(uniquingset, plist);
if (unique != plist) {
refnum = (uint32_t)(uintptr_t)CFDictionaryGetValue(objtable, unique);
CFDictionaryAddValue(objtable, plist, (const void *)(uintptr_t)refnum);
}
return;
}
}
refnum = CFArrayGetCount(objlist);
CFArrayAppendValue(objlist, plist);
CFDictionaryAddValue(objtable, plist, (const void *)(uintptr_t)refnum);
if (dicttype == type) {
CFIndex count = CFDictionaryGetCount((CFDictionaryRef)plist);
STACK_BUFFER_DECL(CFPropertyListRef, buffer, count <= 128 ? count * 2 : 1);
CFPropertyListRef *list = (count <= 128) ? buffer : (CFPropertyListRef *)CFAllocatorAllocate(kCFAllocatorSystemDefault, 2 * count * sizeof(CFTypeRef), __kCFAllocatorGCScannedMemory);
CFDictionaryGetKeysAndValues((CFDictionaryRef)plist, list, list + count);
for (CFIndex idx = 0; idx < 2 * count; idx++) {
_flattenPlist(list[idx], objlist, objtable, uniquingset);
}
if (list != buffer) CFAllocatorDeallocate(kCFAllocatorSystemDefault, list);
} else if (arraytype == type) {
CFIndex count = CFArrayGetCount((CFArrayRef)plist);
STACK_BUFFER_DECL(CFPropertyListRef, buffer, count <= 256 ? count : 1);
CFPropertyListRef *list = (count <= 256) ? buffer : (CFPropertyListRef *)CFAllocatorAllocate(kCFAllocatorSystemDefault, count * sizeof(CFTypeRef), __kCFAllocatorGCScannedMemory);
CFArrayGetValues((CFArrayRef)plist, CFRangeMake(0, count), list);
for (CFIndex idx = 0; idx < count; idx++) {
_flattenPlist(list[idx], objlist, objtable, uniquingset);
}
if (list != buffer) CFAllocatorDeallocate(kCFAllocatorSystemDefault, list);
}
}
/* Get the number of bytes required to hold the value in 'count'. Will return a power of 2 value big enough to hold 'count'.
*/
CF_INLINE uint8_t _byteCount(uint64_t count) {
uint64_t mask = ~(uint64_t)0;
uint8_t size = 0;
// Find something big enough to hold 'count'
while (count & mask) {
size++;
mask = mask << 8;
}
// Ensure that 'count' is a power of 2
// For sizes bigger than 8, just use the required count
while ((size != 1 && size != 2 && size != 4 && size != 8) && size <= 8) {
size++;
}
return size;
}
// stream can be a CFWriteStreamRef (on supported platforms) or a CFMutableDataRef
/* Write a property list to a stream, in binary format. plist is the property list to write (one of the basic property list types), stream is the destination of the property list, and estimate is a best-guess at the total number of objects in the property list. The estimate parameter is for efficiency in pre-allocating memory for the uniquing step. Pass in a 0 if no estimate is available. The options flag specifies sort options. If the error parameter is non-NULL and an error occurs, it will be used to return a CFError explaining the problem. It is the callers responsibility to release the error. */
CFIndex __CFBinaryPlistWrite(CFPropertyListRef plist, CFTypeRef stream, uint64_t estimate, CFOptionFlags options, CFErrorRef *error) {
CFMutableDictionaryRef objtable = NULL;
CFMutableArrayRef objlist = NULL;
CFMutableSetRef uniquingset = NULL;
CFBinaryPlistTrailer trailer;
uint64_t *offsets, length_so_far;
int64_t idx, cnt;
__CFBinaryPlistWriteBuffer *buf;
initStatics();
const CFDictionaryKeyCallBacks dictKeyCallbacks = {0, __CFTypeCollectionRetain, __CFTypeCollectionRelease, 0, 0, 0};
objtable = CFDictionaryCreateMutable(kCFAllocatorSystemDefault, 0, &dictKeyCallbacks, NULL);
const CFArrayCallBacks arrayCallbacks = {0, __CFTypeCollectionRetain, __CFTypeCollectionRelease, 0, 0};
objlist = CFArrayCreateMutable(kCFAllocatorSystemDefault, 0, &arrayCallbacks);
const CFSetCallBacks setCallbacks = {0, __CFTypeCollectionRetain, __CFTypeCollectionRelease, 0, 0, 0};
uniquingset = CFSetCreateMutable(kCFAllocatorSystemDefault, 0, &setCallbacks);
#if DEPLOYMENT_TARGET_MACOSX
_CFDictionarySetCapacity(objtable, estimate ? estimate : 650);
_CFArraySetCapacity(objlist, estimate ? estimate : 650);
_CFSetSetCapacity(uniquingset, estimate ? estimate : 1000);
#endif
_flattenPlist(plist, objlist, objtable, uniquingset);
CFRelease(uniquingset);
cnt = CFArrayGetCount(objlist);
offsets = (uint64_t *)CFAllocatorAllocate(kCFAllocatorSystemDefault, (CFIndex)(cnt * sizeof(*offsets)), 0);
buf = (__CFBinaryPlistWriteBuffer *)CFAllocatorAllocate(kCFAllocatorSystemDefault, sizeof(__CFBinaryPlistWriteBuffer), 0);
buf->stream = stream;
buf->databytes = NULL;
buf->datalen = 0;
buf->error = NULL;
buf->streamIsData = (CFGetTypeID(stream) == CFDataGetTypeID());
buf->written = 0;
buf->used = 0;
bufferWrite(buf, (uint8_t *)"bplist00", 8); // header
memset(&trailer, 0, sizeof(trailer));
trailer._numObjects = CFSwapInt64HostToBig(cnt);
trailer._topObject = 0; // true for this implementation
trailer._objectRefSize = _byteCount(cnt);
for (idx = 0; idx < cnt; idx++) {
offsets[idx] = buf->written + buf->used;
CFPropertyListRef obj = CFArrayGetValueAtIndex(objlist, (CFIndex)idx);
Boolean success = _appendObject(buf, obj, objtable, trailer._objectRefSize);
if (!success) {
CFRelease(objtable);
CFRelease(objlist);
if (error && buf->error) {
// caller will release error
*error = buf->error;
} else if (buf->error) {
// caller is not interested in error, release it here
CFRelease(buf->error);
}
CFAllocatorDeallocate(kCFAllocatorSystemDefault, buf);
CFAllocatorDeallocate(kCFAllocatorSystemDefault, offsets);
return 0;
}
}
CFRelease(objtable);
CFRelease(objlist);
length_so_far = buf->written + buf->used;
trailer._offsetTableOffset = CFSwapInt64HostToBig(length_so_far);
trailer._offsetIntSize = _byteCount(length_so_far);
for (idx = 0; idx < cnt; idx++) {
uint64_t swapped = CFSwapInt64HostToBig(offsets[idx]);
uint8_t *source = (uint8_t *)&swapped;
bufferWrite(buf, source + sizeof(*offsets) - trailer._offsetIntSize, trailer._offsetIntSize);
}
length_so_far += cnt * trailer._offsetIntSize;
CFAllocatorDeallocate(kCFAllocatorSystemDefault, offsets);
bufferWrite(buf, (uint8_t *)&trailer, sizeof(trailer));
bufferFlush(buf);
length_so_far += sizeof(trailer);
if (buf->error) {
if (error) {
// caller will release error
*error = buf->error;
} else {
CFRelease(buf->error);
}
CFAllocatorDeallocate(kCFAllocatorSystemDefault, buf);
return 0;
}
CFAllocatorDeallocate(kCFAllocatorSystemDefault, buf);
return (CFIndex)length_so_far;
}
CFIndex __CFBinaryPlistWriteToStream(CFPropertyListRef plist, CFTypeRef stream) {
return __CFBinaryPlistWrite(plist, stream, 0, 0, NULL);
}
// to be removed soon
CFIndex __CFBinaryPlistWriteToStreamWithEstimate(CFPropertyListRef plist, CFTypeRef stream, uint64_t estimate) {
return __CFBinaryPlistWrite(plist, stream, estimate, 0, NULL);
}
// to be removed soon
CFIndex __CFBinaryPlistWriteToStreamWithOptions(CFPropertyListRef plist, CFTypeRef stream, uint64_t estimate, CFOptionFlags options) {
return __CFBinaryPlistWrite(plist, stream, estimate, options, NULL);
}
#pragma mark -
#pragma mark Reading
#define FAIL_FALSE do { return false; } while (0)
#define FAIL_MAXOFFSET do { return UINT64_MAX; } while (0)
CF_PRIVATE bool __CFBinaryPlistCreateObjectFiltered(const uint8_t *databytes, uint64_t datalen, uint64_t startOffset, const CFBinaryPlistTrailer *trailer, CFAllocatorRef allocator, CFOptionFlags mutabilityOption, CFMutableDictionaryRef objects, CFMutableSetRef set, CFIndex curDepth, CFSetRef keyPaths, CFPropertyListRef *plist);
/* Grab a valSize-bytes integer out of the buffer pointed at by data and return it.
*/
CF_INLINE uint64_t _getSizedInt(const uint8_t *data, uint8_t valSize) {
#if defined(__i386__) || defined(__x86_64__)
if (valSize == 1) {
return (uint64_t)*data;
} else if (valSize == 2) {
uint16_t val = *(uint16_t *)data;
return (uint64_t)CFSwapInt16BigToHost(val);
} else if (valSize == 4) {
uint32_t val = *(uint32_t *)data;
return (uint64_t)CFSwapInt32BigToHost(val);
} else if (valSize == 8) {
uint64_t val = *(uint64_t *)data;
return CFSwapInt64BigToHost(val);
}
#endif
// Compatability with existing archives, including anything with a non-power-of-2
// size and 16-byte values, and architectures that don't support unaligned access
uint64_t res = 0;
for (CFIndex idx = 0; idx < valSize; idx++) {
res = (res << 8) + data[idx];
}
return res;
}
bool __CFBinaryPlistGetTopLevelInfo(const uint8_t *databytes, uint64_t datalen, uint8_t *marker, uint64_t *offset, CFBinaryPlistTrailer *trailer) {
CFBinaryPlistTrailer trail;
initStatics();
if (!databytes || datalen < sizeof(trail) + 8 + 1) FAIL_FALSE;
// Tiger and earlier will parse "bplist00"
// Leopard will parse "bplist00" or "bplist01"
// SnowLeopard will parse "bplist0?" where ? is any one character
if (0 != memcmp("bplist0", databytes, 7)) {
FAIL_FALSE;
}
memmove(&trail, databytes + datalen - sizeof(trail), sizeof(trail));
// In Leopard, the unused bytes in the trailer must be 0 or the parse will fail
// This check is not present in Tiger and earlier or after Leopard
trail._numObjects = CFSwapInt64BigToHost(trail._numObjects);
trail._topObject = CFSwapInt64BigToHost(trail._topObject);
trail._offsetTableOffset = CFSwapInt64BigToHost(trail._offsetTableOffset);
// Don't overflow on the number of objects or offset of the table
if (LONG_MAX < trail._numObjects) FAIL_FALSE;
if (LONG_MAX < trail._offsetTableOffset) FAIL_FALSE;
// Must be a minimum of 1 object
if (trail._numObjects < 1) FAIL_FALSE;
// The ref to the top object must be a value in the range of 1 to the total number of objects
if (trail._numObjects <= trail._topObject) FAIL_FALSE;
// The offset table must be after at least 9 bytes of other data ('bplist??' + 1 byte of object table data).
if (trail._offsetTableOffset < 9) FAIL_FALSE;
// The trailer must point to a value before itself in the data.
if (datalen - sizeof(trail) <= trail._offsetTableOffset) FAIL_FALSE;
// Minimum of 1 byte for the size of integers and references in the data
if (trail._offsetIntSize < 1) FAIL_FALSE;
if (trail._objectRefSize < 1) FAIL_FALSE;
int32_t err = CF_NO_ERROR;
// The total size of the offset table (number of objects * size of each int in the table) must not overflow
uint64_t offsetIntSize = trail._offsetIntSize;
uint64_t offsetTableSize = __check_uint64_mul_unsigned_unsigned(trail._numObjects, offsetIntSize, &err);
if (CF_NO_ERROR!= err) FAIL_FALSE;
// The offset table must have at least 1 entry
if (offsetTableSize < 1) FAIL_FALSE;
// Make sure the size of the offset table and data sections do not overflow
uint64_t objectDataSize = trail._offsetTableOffset - 8;
uint64_t tmpSum = __check_uint64_add_unsigned_unsigned(8, objectDataSize, &err);
tmpSum = __check_uint64_add_unsigned_unsigned(tmpSum, offsetTableSize, &err);
tmpSum = __check_uint64_add_unsigned_unsigned(tmpSum, sizeof(trail), &err);
if (CF_NO_ERROR != err) FAIL_FALSE;
// The total size of the data should be equal to the sum of offsetTableOffset + sizeof(trailer)
if (datalen != tmpSum) FAIL_FALSE;
// The object refs must be the right size to point into the offset table. That is, if the count of objects is 260, but only 1 byte is used to store references (max value 255), something is wrong.
if (trail._objectRefSize < 8 && (1ULL << (8 * trail._objectRefSize)) <= trail._numObjects) FAIL_FALSE;
// The integers used for pointers in the offset table must be able to reach as far as the start of the offset table.
if (trail._offsetIntSize < 8 && (1ULL << (8 * trail._offsetIntSize)) <= trail._offsetTableOffset) FAIL_FALSE;
(void)check_ptr_add(databytes, 8, &err);
if (CF_NO_ERROR != err) FAIL_FALSE;
const uint8_t *offsetsFirstByte = check_ptr_add(databytes, trail._offsetTableOffset, &err);
if (CF_NO_ERROR != err) FAIL_FALSE;
(void)check_ptr_add(offsetsFirstByte, offsetTableSize - 1, &err);
if (CF_NO_ERROR != err) FAIL_FALSE;
const uint8_t *bytesptr = databytes + trail._offsetTableOffset;
uint64_t maxOffset = trail._offsetTableOffset - 1;
for (CFIndex idx = 0; idx < trail._numObjects; idx++) {
uint64_t off = _getSizedInt(bytesptr, trail._offsetIntSize);
if (maxOffset < off) FAIL_FALSE;
bytesptr += trail._offsetIntSize;
}
bytesptr = databytes + trail._offsetTableOffset + trail._topObject * trail._offsetIntSize;
uint64_t off = _getSizedInt(bytesptr, trail._offsetIntSize);
if (off < 8 || trail._offsetTableOffset <= off) FAIL_FALSE;
if (trailer) *trailer = trail;
if (offset) *offset = off;
if (marker) *marker = *(databytes + off);
return true;
}
CF_INLINE Boolean _plistIsPrimitive(CFPropertyListRef pl) {
CFTypeID type = CFGetTypeID(pl);
if (dicttype == type || arraytype == type || settype == type || osettype == type) FAIL_FALSE;
return true;
}
CF_INLINE bool _readInt(const uint8_t *ptr, const uint8_t *end_byte_ptr, uint64_t *bigint, const uint8_t **newptr) {
if (end_byte_ptr < ptr) FAIL_FALSE;
uint8_t marker = *ptr++;
if ((marker & 0xf0) != kCFBinaryPlistMarkerInt) FAIL_FALSE;
uint64_t cnt = 1 << (marker & 0x0f);
int32_t err = CF_NO_ERROR;
const uint8_t *extent = check_ptr_add(ptr, cnt, &err) - 1;
if (CF_NO_ERROR != err) FAIL_FALSE;
if (end_byte_ptr < extent) FAIL_FALSE;
// integers are not required to be in the most compact possible representation, but only the last 64 bits are significant currently
*bigint = _getSizedInt(ptr, cnt);
ptr += cnt;
if (newptr) *newptr = ptr;
return true;
}
// bytesptr points at a ref
CF_INLINE uint64_t _getOffsetOfRefAt(const uint8_t *databytes, const uint8_t *bytesptr, const CFBinaryPlistTrailer *trailer) {
// *trailer contents are trusted, even for overflows -- was checked when the trailer was parsed;
// this pointer arithmetic and the multiplication was also already done once and checked,
// and the offsetTable was already validated.
const uint8_t *objectsFirstByte = databytes + 8;
const uint8_t *offsetsFirstByte = databytes + trailer->_offsetTableOffset;
if (bytesptr < objectsFirstByte || offsetsFirstByte - trailer->_objectRefSize < bytesptr) FAIL_MAXOFFSET;
uint64_t ref = _getSizedInt(bytesptr, trailer->_objectRefSize);
if (trailer->_numObjects <= ref) FAIL_MAXOFFSET;
bytesptr = databytes + trailer->_offsetTableOffset + ref * trailer->_offsetIntSize;
uint64_t off = _getSizedInt(bytesptr, trailer->_offsetIntSize);
return off;
}
bool __CFBinaryPlistGetOffsetForValueFromArray2(const uint8_t *databytes, uint64_t datalen, uint64_t startOffset, const CFBinaryPlistTrailer *trailer, CFIndex idx, uint64_t *offset, CFMutableDictionaryRef objects) {
uint64_t objectsRangeStart = 8, objectsRangeEnd = trailer->_offsetTableOffset - 1;
if (startOffset < objectsRangeStart || objectsRangeEnd < startOffset) FAIL_FALSE;
const uint8_t *ptr = databytes + startOffset;
uint8_t marker = *ptr;
if ((marker & 0xf0) != kCFBinaryPlistMarkerArray) FAIL_FALSE;
int32_t err = CF_NO_ERROR;
ptr = check_ptr_add(ptr, 1, &err);
if (CF_NO_ERROR != err) FAIL_FALSE;
uint64_t cnt = (marker & 0x0f);
if (0xf == cnt) {
uint64_t bigint;
if (!_readInt(ptr, databytes + objectsRangeEnd, &bigint, &ptr)) FAIL_FALSE;
if (LONG_MAX < bigint) FAIL_FALSE;
cnt = bigint;
}
if (cnt <= idx) FAIL_FALSE;
size_t byte_cnt = check_size_t_mul(cnt, trailer->_objectRefSize, &err);
if (CF_NO_ERROR != err) FAIL_FALSE;
const uint8_t *extent = check_ptr_add(ptr, byte_cnt, &err) - 1;
if (CF_NO_ERROR != err) FAIL_FALSE;
if (databytes + objectsRangeEnd < extent) FAIL_FALSE;
uint64_t off = _getOffsetOfRefAt(databytes, ptr + idx * trailer->_objectRefSize, trailer);
if (offset) *offset = off;
return true;
}
/* Get the offset for a value in a dictionary in a binary property list.
@param databytes A pointer to the start of the binary property list data.
@param datalen The length of the data.
@param startOffset The offset at which the dictionary starts.
@param trailer A pointer to a filled out trailer structure (use __CFBinaryPlistGetTopLevelInfo).
@param key A string key in the dictionary that should be searched for.
@param koffset Will be filled out with the offset to the key in the data bytes.
@param voffset Will be filled out with the offset to the value in the data bytes.
@param unused Unused parameter.
@param objects Used for caching objects. Should be a valid CFMutableDictionaryRef.
@return True if the key was found, false otherwise.
*/
bool __CFBinaryPlistGetOffsetForValueFromDictionary3(const uint8_t *databytes, uint64_t datalen, uint64_t startOffset, const CFBinaryPlistTrailer *trailer, CFTypeRef key, uint64_t *koffset, uint64_t *voffset, Boolean unused, CFMutableDictionaryRef objects) {
// Require a key that is a plist primitive
if (!key || !_plistIsPrimitive(key)) FAIL_FALSE;
// Require that startOffset is in the range of the object table
uint64_t objectsRangeStart = 8, objectsRangeEnd = trailer->_offsetTableOffset - 1;
if (startOffset < objectsRangeStart || objectsRangeEnd < startOffset) FAIL_FALSE;
// ptr is the start of the dictionary we are reading
const uint8_t *ptr = databytes + startOffset;
// Check that the data pointer actually points to a dictionary
uint8_t marker = *ptr;
if ((marker & 0xf0) != kCFBinaryPlistMarkerDict) FAIL_FALSE;
// Get the number of objects in this dictionary
int32_t err = CF_NO_ERROR;
ptr = check_ptr_add(ptr, 1, &err);
if (CF_NO_ERROR != err) FAIL_FALSE;
uint64_t cnt = (marker & 0x0f);
if (0xf == cnt) {
uint64_t bigint = 0;
if (!_readInt(ptr, databytes + objectsRangeEnd, &bigint, &ptr)) FAIL_FALSE;
if (LONG_MAX < bigint) FAIL_FALSE;
cnt = bigint;
}
// Total number of objects (keys + values) is cnt * 2
cnt = check_size_t_mul(cnt, 2, &err);
if (CF_NO_ERROR != err) FAIL_FALSE;
size_t byte_cnt = check_size_t_mul(cnt, trailer->_objectRefSize, &err);
if (CF_NO_ERROR != err) FAIL_FALSE;
// Find the end of the dictionary
const uint8_t *extent = check_ptr_add(ptr, byte_cnt, &err) - 1;
if (CF_NO_ERROR != err) FAIL_FALSE;
// Check that we didn't overflow the size of the dictionary
if (databytes + objectsRangeEnd < extent) FAIL_FALSE;
// For short keys (15 bytes or less) in ASCII form, we can do a quick comparison check
// We get the pointer or copy the buffer here, outside of the loop
CFIndex stringKeyLen = -1;
if (CFGetTypeID(key) == stringtype) {
stringKeyLen = CFStringGetLength((CFStringRef)key);
}
// Find the object in the dictionary with this key
cnt = cnt / 2;
uint64_t totalKeySize = cnt * trailer->_objectRefSize;
uint64_t off;
Boolean match = false;
CFPropertyListRef keyInData = NULL;
#define KEY_BUFF_SIZE 16
char keyBuffer[KEY_BUFF_SIZE];
const char *keyBufferPtr = NULL;
// If we have a string for the key, then we will grab the ASCII encoded version of it, if possible, and do a memcmp on it
if (stringKeyLen != -1) {
// Since we will only be comparing ASCII strings, we can attempt to get a pointer using MacRoman encoding
// (this is cheaper than a copy)
if (!(keyBufferPtr = CFStringGetCStringPtr((CFStringRef)key, kCFStringEncodingMacRoman)) && stringKeyLen < KEY_BUFF_SIZE) {
CFStringGetCString((CFStringRef)key, keyBuffer, KEY_BUFF_SIZE, kCFStringEncodingMacRoman);
// The pointer should now point to our keyBuffer instead of the original string buffer, since we've copied it
keyBufferPtr = keyBuffer;
}
}
// Perform linear search of the keys
for (CFIndex idx = 0; idx < cnt; idx++) {
off = _getOffsetOfRefAt(databytes, ptr, trailer);
marker = *(databytes + off);