protobuf/objectivec/GPBCodedInputStream.m
Thomas Van Lenten ba800e2e57 Set the stream limit to the length of the data.
- Mark all conformance tests as now passing.
2015-11-23 12:23:27 -05:00

798 lines
24 KiB
Objective-C

// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// 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 Google Inc. 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.
#import "GPBCodedInputStream_PackagePrivate.h"
#import "GPBDictionary_PackagePrivate.h"
#import "GPBMessage_PackagePrivate.h"
#import "GPBUnknownFieldSet_PackagePrivate.h"
#import "GPBUtilities_PackagePrivate.h"
#import "GPBWireFormat.h"
static const NSUInteger kDefaultRecursionLimit = 64;
static void CheckSize(GPBCodedInputStreamState *state, size_t size) {
size_t newSize = state->bufferPos + size;
if (newSize > state->bufferSize) {
[NSException raise:NSParseErrorException format:@""];
}
if (newSize > state->currentLimit) {
// Fast forward to end of currentLimit;
state->bufferPos = state->currentLimit;
[NSException raise:NSParseErrorException format:@""];
}
}
static int8_t ReadRawByte(GPBCodedInputStreamState *state) {
CheckSize(state, sizeof(int8_t));
return ((int8_t *)state->bytes)[state->bufferPos++];
}
static int32_t ReadRawLittleEndian32(GPBCodedInputStreamState *state) {
CheckSize(state, sizeof(int32_t));
int32_t value = OSReadLittleInt32(state->bytes, state->bufferPos);
state->bufferPos += sizeof(int32_t);
return value;
}
static int64_t ReadRawLittleEndian64(GPBCodedInputStreamState *state) {
CheckSize(state, sizeof(int64_t));
int64_t value = OSReadLittleInt64(state->bytes, state->bufferPos);
state->bufferPos += sizeof(int64_t);
return value;
}
static int32_t ReadRawVarint32(GPBCodedInputStreamState *state) {
int8_t tmp = ReadRawByte(state);
if (tmp >= 0) {
return tmp;
}
int32_t result = tmp & 0x7f;
if ((tmp = ReadRawByte(state)) >= 0) {
result |= tmp << 7;
} else {
result |= (tmp & 0x7f) << 7;
if ((tmp = ReadRawByte(state)) >= 0) {
result |= tmp << 14;
} else {
result |= (tmp & 0x7f) << 14;
if ((tmp = ReadRawByte(state)) >= 0) {
result |= tmp << 21;
} else {
result |= (tmp & 0x7f) << 21;
result |= (tmp = ReadRawByte(state)) << 28;
if (tmp < 0) {
// Discard upper 32 bits.
for (int i = 0; i < 5; i++) {
if (ReadRawByte(state) >= 0) {
return result;
}
}
[NSException raise:NSParseErrorException
format:@"Unable to read varint32"];
}
}
}
}
return result;
}
static int64_t ReadRawVarint64(GPBCodedInputStreamState *state) {
int32_t shift = 0;
int64_t result = 0;
while (shift < 64) {
int8_t b = ReadRawByte(state);
result |= (int64_t)(b & 0x7F) << shift;
if ((b & 0x80) == 0) {
return result;
}
shift += 7;
}
[NSException raise:NSParseErrorException format:@"Unable to read varint64"];
return 0;
}
static void SkipRawData(GPBCodedInputStreamState *state, size_t size) {
CheckSize(state, size);
state->bufferPos += size;
}
double GPBCodedInputStreamReadDouble(GPBCodedInputStreamState *state) {
int64_t value = ReadRawLittleEndian64(state);
return GPBConvertInt64ToDouble(value);
}
float GPBCodedInputStreamReadFloat(GPBCodedInputStreamState *state) {
int32_t value = ReadRawLittleEndian32(state);
return GPBConvertInt32ToFloat(value);
}
uint64_t GPBCodedInputStreamReadUInt64(GPBCodedInputStreamState *state) {
uint64_t value = ReadRawVarint64(state);
return value;
}
uint32_t GPBCodedInputStreamReadUInt32(GPBCodedInputStreamState *state) {
uint32_t value = ReadRawVarint32(state);
return value;
}
int64_t GPBCodedInputStreamReadInt64(GPBCodedInputStreamState *state) {
int64_t value = ReadRawVarint64(state);
return value;
}
int32_t GPBCodedInputStreamReadInt32(GPBCodedInputStreamState *state) {
int32_t value = ReadRawVarint32(state);
return value;
}
uint64_t GPBCodedInputStreamReadFixed64(GPBCodedInputStreamState *state) {
uint64_t value = ReadRawLittleEndian64(state);
return value;
}
uint32_t GPBCodedInputStreamReadFixed32(GPBCodedInputStreamState *state) {
uint32_t value = ReadRawLittleEndian32(state);
return value;
}
int32_t GPBCodedInputStreamReadEnum(GPBCodedInputStreamState *state) {
int32_t value = ReadRawVarint32(state);
return value;
}
int32_t GPBCodedInputStreamReadSFixed32(GPBCodedInputStreamState *state) {
int32_t value = ReadRawLittleEndian32(state);
return value;
}
int64_t GPBCodedInputStreamReadSFixed64(GPBCodedInputStreamState *state) {
int64_t value = ReadRawLittleEndian64(state);
return value;
}
int32_t GPBCodedInputStreamReadSInt32(GPBCodedInputStreamState *state) {
int32_t value = GPBDecodeZigZag32(ReadRawVarint32(state));
return value;
}
int64_t GPBCodedInputStreamReadSInt64(GPBCodedInputStreamState *state) {
int64_t value = GPBDecodeZigZag64(ReadRawVarint64(state));
return value;
}
BOOL GPBCodedInputStreamReadBool(GPBCodedInputStreamState *state) {
return ReadRawVarint32(state) != 0;
}
int32_t GPBCodedInputStreamReadTag(GPBCodedInputStreamState *state) {
if (GPBCodedInputStreamIsAtEnd(state)) {
state->lastTag = 0;
return 0;
}
state->lastTag = ReadRawVarint32(state);
if (state->lastTag == 0) {
// If we actually read zero, that's not a valid tag.
[NSException raise:NSParseErrorException
format:@"Invalid last tag %d", state->lastTag];
}
return state->lastTag;
}
NSString *GPBCodedInputStreamReadRetainedString(
GPBCodedInputStreamState *state) {
int32_t size = ReadRawVarint32(state);
NSString *result;
if (size == 0) {
result = @"";
} else {
CheckSize(state, size);
result = GPBCreateGPBStringWithUTF8(&state->bytes[state->bufferPos], size);
state->bufferPos += size;
}
return result;
}
NSData *GPBCodedInputStreamReadRetainedBytes(GPBCodedInputStreamState *state) {
int32_t size = ReadRawVarint32(state);
if (size < 0) return nil;
CheckSize(state, size);
NSData *result = [[NSData alloc] initWithBytes:state->bytes + state->bufferPos
length:size];
state->bufferPos += size;
return result;
}
NSData *GPBCodedInputStreamReadRetainedBytesNoCopy(
GPBCodedInputStreamState *state) {
int32_t size = ReadRawVarint32(state);
if (size < 0) return nil;
CheckSize(state, size);
// Cast is safe because freeWhenDone is NO.
NSData *result = [[NSData alloc]
initWithBytesNoCopy:(void *)(state->bytes + state->bufferPos)
length:size
freeWhenDone:NO];
state->bufferPos += size;
return result;
}
size_t GPBCodedInputStreamPushLimit(GPBCodedInputStreamState *state,
size_t byteLimit) {
byteLimit += state->bufferPos;
size_t oldLimit = state->currentLimit;
if (byteLimit > oldLimit) {
[NSException raise:NSInvalidArgumentException
format:@"byteLimit > oldLimit: %tu > %tu", byteLimit, oldLimit];
}
state->currentLimit = byteLimit;
return oldLimit;
}
void GPBCodedInputStreamPopLimit(GPBCodedInputStreamState *state,
size_t oldLimit) {
state->currentLimit = oldLimit;
}
size_t GPBCodedInputStreamBytesUntilLimit(GPBCodedInputStreamState *state) {
return state->currentLimit - state->bufferPos;
}
BOOL GPBCodedInputStreamIsAtEnd(GPBCodedInputStreamState *state) {
return (state->bufferPos == state->bufferSize) ||
(state->bufferPos == state->currentLimit);
}
void GPBCodedInputStreamCheckLastTagWas(GPBCodedInputStreamState *state,
int32_t value) {
if (state->lastTag != value) {
[NSException raise:NSParseErrorException
format:@"Last tag: %d should be %d", state->lastTag, value];
}
}
@implementation GPBCodedInputStream
+ (instancetype)streamWithData:(NSData *)data {
return [[[self alloc] initWithData:data] autorelease];
}
- (instancetype)initWithData:(NSData *)data {
if ((self = [super init])) {
#ifdef DEBUG
NSCAssert([self class] == [GPBCodedInputStream class],
@"Subclassing of GPBCodedInputStream is not allowed.");
#endif
buffer_ = [data retain];
state_.bytes = (const uint8_t *)[data bytes];
state_.bufferSize = [data length];
state_.currentLimit = state_.bufferSize;
}
return self;
}
- (void)dealloc {
[buffer_ release];
[super dealloc];
}
- (int32_t)readTag {
return GPBCodedInputStreamReadTag(&state_);
}
- (void)checkLastTagWas:(int32_t)value {
GPBCodedInputStreamCheckLastTagWas(&state_, value);
}
- (BOOL)skipField:(int32_t)tag {
switch (GPBWireFormatGetTagWireType(tag)) {
case GPBWireFormatVarint:
GPBCodedInputStreamReadInt32(&state_);
return YES;
case GPBWireFormatFixed64:
SkipRawData(&state_, sizeof(int64_t));
return YES;
case GPBWireFormatLengthDelimited:
SkipRawData(&state_, ReadRawVarint32(&state_));
return YES;
case GPBWireFormatStartGroup:
[self skipMessage];
GPBCodedInputStreamCheckLastTagWas(
&state_, GPBWireFormatMakeTag(GPBWireFormatGetTagFieldNumber(tag),
GPBWireFormatEndGroup));
return YES;
case GPBWireFormatEndGroup:
return NO;
case GPBWireFormatFixed32:
SkipRawData(&state_, sizeof(int32_t));
return YES;
}
[NSException raise:NSParseErrorException format:@"Invalid tag %d", tag];
return NO;
}
- (void)skipMessage {
while (YES) {
int32_t tag = GPBCodedInputStreamReadTag(&state_);
if (tag == 0 || ![self skipField:tag]) {
return;
}
}
}
- (double)readDouble {
return GPBCodedInputStreamReadDouble(&state_);
}
- (float)readFloat {
return GPBCodedInputStreamReadFloat(&state_);
}
- (uint64_t)readUInt64 {
return GPBCodedInputStreamReadUInt64(&state_);
}
- (int64_t)readInt64 {
return GPBCodedInputStreamReadInt64(&state_);
}
- (int32_t)readInt32 {
return GPBCodedInputStreamReadInt32(&state_);
}
- (uint64_t)readFixed64 {
return GPBCodedInputStreamReadFixed64(&state_);
}
- (uint32_t)readFixed32 {
return GPBCodedInputStreamReadFixed32(&state_);
}
- (BOOL)readBool {
return GPBCodedInputStreamReadBool(&state_);
}
- (NSString *)readString {
return [GPBCodedInputStreamReadRetainedString(&state_) autorelease];
}
- (void)readGroup:(int32_t)fieldNumber
message:(GPBMessage *)message
extensionRegistry:(GPBExtensionRegistry *)extensionRegistry {
if (state_.recursionDepth >= kDefaultRecursionLimit) {
[NSException raise:NSParseErrorException
format:@"recursionDepth(%tu) >= %tu", state_.recursionDepth,
kDefaultRecursionLimit];
}
++state_.recursionDepth;
[message mergeFromCodedInputStream:self extensionRegistry:extensionRegistry];
GPBCodedInputStreamCheckLastTagWas(
&state_, GPBWireFormatMakeTag(fieldNumber, GPBWireFormatEndGroup));
--state_.recursionDepth;
}
- (void)readUnknownGroup:(int32_t)fieldNumber
message:(GPBUnknownFieldSet *)message {
if (state_.recursionDepth >= kDefaultRecursionLimit) {
[NSException raise:NSParseErrorException
format:@"recursionDepth(%tu) >= %tu", state_.recursionDepth,
kDefaultRecursionLimit];
}
++state_.recursionDepth;
[message mergeFromCodedInputStream:self];
GPBCodedInputStreamCheckLastTagWas(
&state_, GPBWireFormatMakeTag(fieldNumber, GPBWireFormatEndGroup));
--state_.recursionDepth;
}
- (void)readMessage:(GPBMessage *)message
extensionRegistry:(GPBExtensionRegistry *)extensionRegistry {
int32_t length = ReadRawVarint32(&state_);
if (state_.recursionDepth >= kDefaultRecursionLimit) {
[NSException raise:NSParseErrorException
format:@"recursionDepth(%tu) >= %tu", state_.recursionDepth,
kDefaultRecursionLimit];
}
size_t oldLimit = GPBCodedInputStreamPushLimit(&state_, length);
++state_.recursionDepth;
[message mergeFromCodedInputStream:self extensionRegistry:extensionRegistry];
GPBCodedInputStreamCheckLastTagWas(&state_, 0);
--state_.recursionDepth;
GPBCodedInputStreamPopLimit(&state_, oldLimit);
}
- (void)readMapEntry:(id)mapDictionary
extensionRegistry:(GPBExtensionRegistry *)extensionRegistry
field:(GPBFieldDescriptor *)field
parentMessage:(GPBMessage *)parentMessage {
int32_t length = ReadRawVarint32(&state_);
if (state_.recursionDepth >= kDefaultRecursionLimit) {
[NSException raise:NSParseErrorException
format:@"recursionDepth(%tu) >= %tu", state_.recursionDepth,
kDefaultRecursionLimit];
}
size_t oldLimit = GPBCodedInputStreamPushLimit(&state_, length);
++state_.recursionDepth;
GPBDictionaryReadEntry(mapDictionary, self, extensionRegistry, field,
parentMessage);
GPBCodedInputStreamCheckLastTagWas(&state_, 0);
--state_.recursionDepth;
GPBCodedInputStreamPopLimit(&state_, oldLimit);
}
- (NSData *)readBytes {
return [GPBCodedInputStreamReadRetainedBytes(&state_) autorelease];
}
- (uint32_t)readUInt32 {
return GPBCodedInputStreamReadUInt32(&state_);
}
- (int32_t)readEnum {
return GPBCodedInputStreamReadEnum(&state_);
}
- (int32_t)readSFixed32 {
return GPBCodedInputStreamReadSFixed32(&state_);
}
- (int64_t)readSFixed64 {
return GPBCodedInputStreamReadSFixed64(&state_);
}
- (int32_t)readSInt32 {
return GPBCodedInputStreamReadSInt32(&state_);
}
- (int64_t)readSInt64 {
return GPBCodedInputStreamReadSInt64(&state_);
}
@end
@implementation GPBString {
@package
CFStringRef string_;
unsigned char *utf8_;
NSUInteger utf8Len_;
// This lock is used to gate access to utf8_. Once GPBStringInitStringValue()
// has been called, string_ will be filled in, and utf8_ will be NULL.
OSSpinLock lock_;
BOOL hasBOM_;
BOOL is7BitAscii_;
}
// Returns true if the passed in bytes are 7 bit ascii.
// This routine needs to be fast.
static bool AreBytesIn7BitASCII(const uint8_t *bytes, NSUInteger len) {
// In the loops below, it's more efficient to collect rather than do
// conditional at every step.
#if __LP64__
// Align bytes. This is especially important in case of 3 byte BOM.
while (len > 0 && ((size_t)bytes & 0x07)) {
if (*bytes++ & 0x80) return false;
len--;
}
while (len >= 32) {
uint64_t val = *(const uint64_t *)bytes;
uint64_t hiBits = (val & 0x8080808080808080ULL);
bytes += 8;
val = *(const uint64_t *)bytes;
hiBits |= (val & 0x8080808080808080ULL);
bytes += 8;
val = *(const uint64_t *)bytes;
hiBits |= (val & 0x8080808080808080ULL);
bytes += 8;
val = *(const uint64_t *)bytes;
if (hiBits | (val & 0x8080808080808080ULL)) return false;
bytes += 8;
len -= 32;
}
while (len >= 16) {
uint64_t val = *(const uint64_t *)bytes;
uint64_t hiBits = (val & 0x8080808080808080ULL);
bytes += 8;
val = *(const uint64_t *)bytes;
if (hiBits | (val & 0x8080808080808080ULL)) return false;
bytes += 8;
len -= 16;
}
while (len >= 8) {
uint64_t val = *(const uint64_t *)bytes;
if (val & 0x8080808080808080ULL) return false;
bytes += 8;
len -= 8;
}
#else // __LP64__
// Align bytes. This is especially important in case of 3 byte BOM.
while (len > 0 && ((size_t)bytes & 0x03)) {
if (*bytes++ & 0x80) return false;
len--;
}
while (len >= 16) {
uint32_t val = *(const uint32_t *)bytes;
uint32_t hiBits = (val & 0x80808080U);
bytes += 4;
val = *(const uint32_t *)bytes;
hiBits |= (val & 0x80808080U);
bytes += 4;
val = *(const uint32_t *)bytes;
hiBits |= (val & 0x80808080U);
bytes += 4;
val = *(const uint32_t *)bytes;
if (hiBits | (val & 0x80808080U)) return false;
bytes += 4;
len -= 16;
}
while (len >= 8) {
uint32_t val = *(const uint32_t *)bytes;
uint32_t hiBits = (val & 0x80808080U);
bytes += 4;
val = *(const uint32_t *)bytes;
if (hiBits | (val & 0x80808080U)) return false;
bytes += 4;
len -= 8;
}
#endif // __LP64__
while (len >= 4) {
uint32_t val = *(const uint32_t *)bytes;
if (val & 0x80808080U) return false;
bytes += 4;
len -= 4;
}
while (len--) {
if (*bytes++ & 0x80) return false;
}
return true;
}
static void GPBStringInitStringValue(GPBString *string) {
OSSpinLockLock(&string->lock_);
GPBStringInitStringValueAlreadyLocked(string);
OSSpinLockUnlock(&string->lock_);
}
static void GPBStringInitStringValueAlreadyLocked(GPBString *string) {
if (string->string_ == NULL && string->utf8_ != NULL) {
// Using kCFAllocatorMalloc for contentsDeallocator, as buffer in
// string->utf8_ is being handed off.
string->string_ = CFStringCreateWithBytesNoCopy(
NULL, string->utf8_, string->utf8Len_, kCFStringEncodingUTF8, false,
kCFAllocatorMalloc);
if (!string->string_) {
#ifdef DEBUG
// https://developers.google.com/protocol-buffers/docs/proto#scalar
NSLog(@"UTF8 failure, is some field type 'string' when it should be "
@"'bytes'?");
#endif
string->string_ = CFSTR("");
string->utf8Len_ = 0;
// On failure, we have to clean up the buffer.
free(string->utf8_);
}
string->utf8_ = NULL;
}
}
GPBString *GPBCreateGPBStringWithUTF8(const void *bytes, NSUInteger length) {
GPBString *result = [[GPBString alloc] initWithBytes:bytes length:length];
return result;
}
- (instancetype)initWithBytes:(const void *)bytes length:(NSUInteger)length {
self = [super init];
if (self) {
utf8_ = malloc(length);
memcpy(utf8_, bytes, length);
utf8Len_ = length;
lock_ = OS_SPINLOCK_INIT;
is7BitAscii_ = AreBytesIn7BitASCII(bytes, length);
if (length >= 3 && memcmp(utf8_, "\xef\xbb\xbf", 3) == 0) {
// We can't just remove the BOM from the string here, because in the case
// where we have > 1 BOM at the beginning of the string, we will remove one,
// and the internal NSString we create will remove the next one, and we will
// end up with a GPBString != NSString issue.
// We also just can't remove all the BOMs because then we would end up with
// potential cases where a GPBString and an NSString made with the same
// UTF8 buffer would in fact be different.
// We record the fact we have a BOM, and use it as necessary to simulate
// what NSString would return for various calls.
hasBOM_ = YES;
#if DEBUG
// Sending BOMs across the line is just wasting bits.
NSLog(@"Bad data? String should not have BOM!");
#endif // DEBUG
}
}
return self;
}
- (void)dealloc {
if (string_ != NULL) {
CFRelease(string_);
}
if (utf8_ != NULL) {
free(utf8_);
}
[super dealloc];
}
// Required NSString overrides.
- (NSUInteger)length {
if (is7BitAscii_) {
return utf8Len_;
} else {
GPBStringInitStringValue(self);
return CFStringGetLength(string_);
}
}
- (unichar)characterAtIndex:(NSUInteger)anIndex {
OSSpinLockLock(&lock_);
if (is7BitAscii_ && utf8_) {
unichar result = utf8_[anIndex];
OSSpinLockUnlock(&lock_);
return result;
} else {
GPBStringInitStringValueAlreadyLocked(self);
OSSpinLockUnlock(&lock_);
return CFStringGetCharacterAtIndex(string_, anIndex);
}
}
// Override a couple of methods that typically want high performance.
- (id)copyWithZone:(NSZone *)zone {
GPBStringInitStringValue(self);
return [(NSString *)string_ copyWithZone:zone];
}
- (id)mutableCopyWithZone:(NSZone *)zone {
GPBStringInitStringValue(self);
return [(NSString *)string_ mutableCopyWithZone:zone];
}
- (NSUInteger)hash {
// Must convert to string here to make sure that the hash is always
// consistent no matter what state the GPBString is in.
GPBStringInitStringValue(self);
return CFHash(string_);
}
- (BOOL)isEqual:(id)object {
if (self == object) {
return YES;
}
if ([object isKindOfClass:[NSString class]]) {
GPBStringInitStringValue(self);
return CFStringCompare(string_, (CFStringRef)object, 0) ==
kCFCompareEqualTo;
}
return NO;
}
- (void)getCharacters:(unichar *)buffer range:(NSRange)aRange {
OSSpinLockLock(&lock_);
if (is7BitAscii_ && utf8_) {
unsigned char *bytes = &(utf8_[aRange.location]);
for (NSUInteger i = 0; i < aRange.length; ++i) {
buffer[i] = bytes[i];
}
OSSpinLockUnlock(&lock_);
} else {
GPBStringInitStringValueAlreadyLocked(self);
OSSpinLockUnlock(&lock_);
CFStringGetCharacters(string_, CFRangeMake(aRange.location, aRange.length),
buffer);
}
}
- (NSUInteger)lengthOfBytesUsingEncoding:(NSStringEncoding)encoding {
if ((encoding == NSUTF8StringEncoding) ||
(encoding == NSASCIIStringEncoding && is7BitAscii_)) {
return utf8Len_ - (hasBOM_ ? 3 : 0);
} else {
GPBStringInitStringValue(self);
return [(NSString *)string_ lengthOfBytesUsingEncoding:encoding];
}
}
- (BOOL)getBytes:(void *)buffer
maxLength:(NSUInteger)maxLength
usedLength:(NSUInteger *)usedLength
encoding:(NSStringEncoding)encoding
options:(NSStringEncodingConversionOptions)options
range:(NSRange)range
remainingRange:(NSRangePointer)remainingRange {
// [NSString getBytes:maxLength:usedLength:encoding:options:range:remainingRange]
// does not return reliable results if the maxLength argument is 0
// (Radar 16385183). Therefore we have special cased it as a slow case so
// that it behaves however Apple intends it to behave. It should be a rare
// case.
//
// [NSString getBytes:maxLength:usedLength:encoding:options:range:remainingRange]
// does not return reliable results if the range is outside of the strings
// length (Radar 16396177). Therefore we have special cased it as a slow
// case so that it behaves however Apple intends it to behave. It should
// be a rare case.
//
// We can optimize the UTF8StringEncoding and NSASCIIStringEncoding with no
// options cases.
if ((options == 0) &&
(encoding == NSUTF8StringEncoding || encoding == NSASCIIStringEncoding) &&
(maxLength != 0) &&
(NSMaxRange(range) <= utf8Len_)) {
// Might be able to optimize it.
OSSpinLockLock(&lock_);
if (is7BitAscii_ && utf8_) {
NSUInteger length = range.length;
length = (length < maxLength) ? length : maxLength;
memcpy(buffer, utf8_ + range.location, length);
if (usedLength) {
*usedLength = length;
}
if (remainingRange) {
remainingRange->location = range.location + length;
remainingRange->length = range.length - length;
}
OSSpinLockUnlock(&lock_);
if (length > 0) {
return YES;
} else {
return NO;
}
} else {
GPBStringInitStringValueAlreadyLocked(self);
OSSpinLockUnlock(&lock_);
}
} else {
GPBStringInitStringValue(self);
}
return [(NSString *)string_ getBytes:buffer
maxLength:maxLength
usedLength:usedLength
encoding:encoding
options:options
range:range
remainingRange:remainingRange];
}
@end