objectivec/Tests/GPBCodedInputStreamTests.m - third_party/protobuf - Git at Google

 // 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 "GPBTestUtilities.h"

 #import "GPBCodedInputStream.h"
 #import "GPBCodedOutputStream.h"
 #import "GPBUnknownFieldSet_PackagePrivate.h"
 #import "GPBUtilities_PackagePrivate.h"
 #import "google/protobuf/Unittest.pbobjc.h"

 @interface CodedInputStreamTests : GPBTestCase
 @end

 @implementation CodedInputStreamTests

 - (NSData*)bytes_with_sentinel:(int32_t)unused, ... {
   va_list list;
   va_start(list, unused);

   NSMutableData* values = [NSMutableData dataWithCapacity:0];
   int32_t i;

   while ((i = va_arg(list, int32_t)) != 256) {
     NSAssert(i >= 0 && i < 256, @"");
     uint8_t u = (uint8_t)i;
     [values appendBytes:&u length:1];
   }

   va_end(list);

   return values;
 }

 #define bytes(...) [self bytes_with_sentinel:0, __VA_ARGS__, 256]

 - (void)testDecodeZigZag {
   XCTAssertEqual(0, GPBDecodeZigZag32(0));
   XCTAssertEqual(-1, GPBDecodeZigZag32(1));
   XCTAssertEqual(1, GPBDecodeZigZag32(2));
   XCTAssertEqual(-2, GPBDecodeZigZag32(3));
   XCTAssertEqual((int32_t)0x3FFFFFFF, GPBDecodeZigZag32(0x7FFFFFFE));
   XCTAssertEqual((int32_t)0xC0000000, GPBDecodeZigZag32(0x7FFFFFFF));
   XCTAssertEqual((int32_t)0x7FFFFFFF, GPBDecodeZigZag32(0xFFFFFFFE));
   XCTAssertEqual((int32_t)0x80000000, GPBDecodeZigZag32(0xFFFFFFFF));

   XCTAssertEqual((int64_t)0, GPBDecodeZigZag64(0));
   XCTAssertEqual((int64_t)-1, GPBDecodeZigZag64(1));
   XCTAssertEqual((int64_t)1, GPBDecodeZigZag64(2));
   XCTAssertEqual((int64_t)-2, GPBDecodeZigZag64(3));
   XCTAssertEqual((int64_t)0x000000003FFFFFFFL,
                  GPBDecodeZigZag64(0x000000007FFFFFFEL));
   XCTAssertEqual((int64_t)0xFFFFFFFFC0000000L,
                  GPBDecodeZigZag64(0x000000007FFFFFFFL));
   XCTAssertEqual((int64_t)0x000000007FFFFFFFL,
                  GPBDecodeZigZag64(0x00000000FFFFFFFEL));
   XCTAssertEqual((int64_t)0xFFFFFFFF80000000L,
                  GPBDecodeZigZag64(0x00000000FFFFFFFFL));
   XCTAssertEqual((int64_t)0x7FFFFFFFFFFFFFFFL,
                  GPBDecodeZigZag64(0xFFFFFFFFFFFFFFFEL));
   XCTAssertEqual((int64_t)0x8000000000000000L,
                  GPBDecodeZigZag64(0xFFFFFFFFFFFFFFFFL));
 }

 - (void)assertReadVarint:(NSData*)data value:(int64_t)value {
   {
     GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
     XCTAssertEqual((int32_t)value, [input readInt32]);
   }
   {
     GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
     XCTAssertEqual(value, [input readInt64]);
   }
 }

 - (void)assertReadLittleEndian32:(NSData*)data value:(int32_t)value {
   GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
   XCTAssertEqual(value, [input readSFixed32]);
 }

 - (void)assertReadLittleEndian64:(NSData*)data value:(int64_t)value {
   GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
   XCTAssertEqual(value, [input readSFixed64]);
 }

 - (void)assertReadVarintFailure:(NSData*)data {
   {
     GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
     XCTAssertThrows([input readInt32]);
   }
   {
     GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
     XCTAssertThrows([input readInt64]);
   }
 }

 - (void)testBytes {
   NSData* data = bytes(0xa2, 0x74);
   XCTAssertEqual(data.length, (NSUInteger)2);
   XCTAssertEqual(((uint8_t*)data.bytes)[0], (uint8_t)0xa2);
   XCTAssertEqual(((uint8_t*)data.bytes)[1], (uint8_t)0x74);
 }

 - (void)testReadVarint {
   [self assertReadVarint:bytes(0x00) value:0];
   [self assertReadVarint:bytes(0x01) value:1];
   [self assertReadVarint:bytes(0x7f) value:127];
   // 14882
   [self assertReadVarint:bytes(0xa2, 0x74) value:(0x22 << 0) | (0x74 << 7)];
   // 2961488830
   [self assertReadVarint:bytes(0xbe, 0xf7, 0x92, 0x84, 0x0b)
                    value:(0x3e << 0) | (0x77 << 7) | (0x12 << 14) |
                          (0x04 << 21) | (0x0bLL << 28)];

   // 64-bit
   // 7256456126
   [self assertReadVarint:bytes(0xbe, 0xf7, 0x92, 0x84, 0x1b)
                    value:(0x3e << 0) | (0x77 << 7) | (0x12 << 14) |
                          (0x04 << 21) | (0x1bLL << 28)];
   // 41256202580718336
   [self assertReadVarint:bytes(0x80, 0xe6, 0xeb, 0x9c, 0xc3, 0xc9, 0xa4, 0x49)
                    value:(0x00 << 0) | (0x66 << 7) | (0x6b << 14) |
                          (0x1c << 21) | (0x43LL << 28) | (0x49LL << 35) |
                          (0x24LL << 42) | (0x49LL << 49)];
   // 11964378330978735131
   [self
       assertReadVarint:bytes(0x9b, 0xa8, 0xf9, 0xc2, 0xbb, 0xd6, 0x80, 0x85,
                              0xa6, 0x01)
                  value:(0x1b << 0) | (0x28 << 7) | (0x79 << 14) | (0x42 << 21) |
                        (0x3bLL << 28) | (0x56LL << 35) | (0x00LL << 42) |
                        (0x05LL << 49) | (0x26LL << 56) | (0x01LL << 63)];

   // Failures
   [self assertReadVarintFailure:bytes(0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
                                       0x80, 0x80, 0x80, 0x00)];
   [self assertReadVarintFailure:bytes(0x80)];
 }

 - (void)testReadLittleEndian {
   [self assertReadLittleEndian32:bytes(0x78, 0x56, 0x34, 0x12)
                            value:0x12345678];
   [self assertReadLittleEndian32:bytes(0xf0, 0xde, 0xbc, 0x9a)
                            value:0x9abcdef0];

   [self assertReadLittleEndian64:bytes(0xf0, 0xde, 0xbc, 0x9a, 0x78, 0x56, 0x34,
                                        0x12)
                            value:0x123456789abcdef0LL];
   [self assertReadLittleEndian64:bytes(0x78, 0x56, 0x34, 0x12, 0xf0, 0xde, 0xbc,
                                        0x9a)
                            value:0x9abcdef012345678LL];
 }

 - (void)testReadWholeMessage {
   TestAllTypes* message = [self allSetRepeatedCount:kGPBDefaultRepeatCount];

   NSData* rawBytes = message.data;
   XCTAssertEqual(message.serializedSize, (size_t)rawBytes.length);

   TestAllTypes* message2 =
       [TestAllTypes parseFromData:rawBytes extensionRegistry:nil error:NULL];
   [self assertAllFieldsSet:message2 repeatedCount:kGPBDefaultRepeatCount];
 }

 - (void)testSkipWholeMessage {
   TestAllTypes* message = [self allSetRepeatedCount:kGPBDefaultRepeatCount];
   NSData* rawBytes = message.data;

   // Create two parallel inputs.  Parse one as unknown fields while using
   // skipField() to skip each field on the other.  Expect the same tags.
   GPBCodedInputStream* input1 = [GPBCodedInputStream streamWithData:rawBytes];
   GPBCodedInputStream* input2 = [GPBCodedInputStream streamWithData:rawBytes];
   GPBUnknownFieldSet* unknownFields =
       [[[GPBUnknownFieldSet alloc] init] autorelease];

   while (YES) {
     int32_t tag = [input1 readTag];
     XCTAssertEqual(tag, [input2 readTag]);
     if (tag == 0) {
       break;
     }
     [unknownFields mergeFieldFrom:tag input:input1];
     [input2 skipField:tag];
   }
 }

 - (void)testReadHugeBlob {
   // Allocate and initialize a 1MB blob.
   NSMutableData* blob = [NSMutableData dataWithLength:1 << 20];
   for (NSUInteger i = 0; i < blob.length; i++) {
     ((uint8_t*)blob.mutableBytes)[i] = (uint8_t)i;
   }

   // Make a message containing it.
   TestAllTypes* message = [TestAllTypes message];
   [self setAllFields:message repeatedCount:kGPBDefaultRepeatCount];
   [message setOptionalBytes:blob];

   // Serialize and parse it.  Make sure to parse from an InputStream, not
   // directly from a ByteString, so that CodedInputStream uses buffered
   // reading.
   NSData *messageData = message.data;
   XCTAssertNotNil(messageData);
   GPBCodedInputStream* stream =
       [GPBCodedInputStream streamWithData:messageData];
   TestAllTypes* message2 = [TestAllTypes parseFromCodedInputStream:stream
                                                  extensionRegistry:nil
                                                              error:NULL];

   XCTAssertEqualObjects(message.optionalBytes, message2.optionalBytes);

   // Make sure all the other fields were parsed correctly.
   TestAllTypes* message3 = [[message2 copy] autorelease];
   TestAllTypes* types = [self allSetRepeatedCount:kGPBDefaultRepeatCount];
   NSData* data = [types optionalBytes];
   [message3 setOptionalBytes:data];

   [self assertAllFieldsSet:message3 repeatedCount:kGPBDefaultRepeatCount];
 }

 - (void)testReadMaliciouslyLargeBlob {
   NSOutputStream* rawOutput = [NSOutputStream outputStreamToMemory];
   GPBCodedOutputStream* output =
       [GPBCodedOutputStream streamWithOutputStream:rawOutput];

   int32_t tag = GPBWireFormatMakeTag(1, GPBWireFormatLengthDelimited);
   [output writeRawVarint32:tag];
   [output writeRawVarint32:0x7FFFFFFF];
   uint8_t bytes[32] = {0};
   [output writeRawData:[NSData dataWithBytes:bytes length:32]];
   [output flush];

   NSData* data =
       [rawOutput propertyForKey:NSStreamDataWrittenToMemoryStreamKey];
   GPBCodedInputStream* input =
       [GPBCodedInputStream streamWithData:[NSMutableData dataWithData:data]];
   XCTAssertEqual(tag, [input readTag]);

   XCTAssertThrows([input readBytes]);
 }

 // Verifies fix for b/10315336.
 // Note: Now that there isn't a custom string class under the hood, this test
 // isn't as critical, but it does cover bad input and if a custom class is added
 // again, it will help validate that class' handing of bad utf8.
 - (void)testReadMalformedString {
   NSOutputStream* rawOutput = [NSOutputStream outputStreamToMemory];
   GPBCodedOutputStream* output =
       [GPBCodedOutputStream streamWithOutputStream:rawOutput];

   int32_t tag = GPBWireFormatMakeTag(TestAllTypes_FieldNumber_DefaultString,
                                      GPBWireFormatLengthDelimited);
   [output writeRawVarint32:tag];
   [output writeRawVarint32:5];
   // Create an invalid utf-8 byte array.
   uint8_t bytes[] = {0xc2, 0xf2, 0x0, 0x0, 0x0};
   [output writeRawData:[NSData dataWithBytes:bytes length:sizeof(bytes)]];
   [output flush];

   NSData *data =
       [rawOutput propertyForKey:NSStreamDataWrittenToMemoryStreamKey];
   GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
   NSError *error = nil;
   TestAllTypes* message = [TestAllTypes parseFromCodedInputStream:input
                                                 extensionRegistry:nil
                                                             error:&error];
   XCTAssertNotNil(error);
   XCTAssertNil(message);
 }

 - (void)testBOMWithinStrings {
   // We've seen servers that end up with BOMs within strings (not always at the
   // start, and sometimes in multiple places), make sure they always parse
   // correctly. (Again, this is inpart incase a custom string class is ever
   // used again.)
   const char* strs[] = {
     "\xEF\xBB\xBF String with BOM",
     "String with \xEF\xBB\xBF in middle",
     "String with end bom \xEF\xBB\xBF",
     "\xEF\xBB\xBF\xe2\x99\xa1",  // BOM White Heart
     "\xEF\xBB\xBF\xEF\xBB\xBF String with Two BOM",
   };
   for (size_t i = 0; i < GPBARRAYSIZE(strs); ++i) {
     NSOutputStream* rawOutput = [NSOutputStream outputStreamToMemory];
     GPBCodedOutputStream* output =
         [GPBCodedOutputStream streamWithOutputStream:rawOutput];

     int32_t tag = GPBWireFormatMakeTag(TestAllTypes_FieldNumber_DefaultString,
                                        GPBWireFormatLengthDelimited);
     [output writeRawVarint32:tag];
     size_t length = strlen(strs[i]);
     [output writeRawVarint32:(int32_t)length];
     [output writeRawData:[NSData dataWithBytes:strs[i] length:length]];
     [output flush];

     NSData* data =
         [rawOutput propertyForKey:NSStreamDataWrittenToMemoryStreamKey];
     GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
     TestAllTypes* message = [TestAllTypes parseFromCodedInputStream:input
                                                   extensionRegistry:nil
                                                               error:NULL];
     XCTAssertNotNil(message, @"Loop %zd", i);
     // Ensure the string is there. NSString can consume the BOM in some
     // cases, so don't actually check the string for exact equality.
     XCTAssertTrue(message.defaultString.length > 0, @"Loop %zd", i);
   }
 }

 @end
	// 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 "GPBTestUtilities.h"

	#import "GPBCodedInputStream.h"
	#import "GPBCodedOutputStream.h"
	#import "GPBUnknownFieldSet_PackagePrivate.h"
	#import "GPBUtilities_PackagePrivate.h"
	#import "google/protobuf/Unittest.pbobjc.h"

	@interface CodedInputStreamTests : GPBTestCase
	@end

	@implementation CodedInputStreamTests

	- (NSData*)bytes_with_sentinel:(int32_t)unused, ... {
	va_list list;
	va_start(list, unused);

	NSMutableData* values = [NSMutableData dataWithCapacity:0];
	int32_t i;

	while ((i = va_arg(list, int32_t)) != 256) {
	NSAssert(i >= 0 && i < 256, @"");
	uint8_t u = (uint8_t)i;
	[values appendBytes:&u length:1];
	}

	va_end(list);

	return values;
	}

	#define bytes(...) [self bytes_with_sentinel:0, __VA_ARGS__, 256]

	- (void)testDecodeZigZag {
	XCTAssertEqual(0, GPBDecodeZigZag32(0));
	XCTAssertEqual(-1, GPBDecodeZigZag32(1));
	XCTAssertEqual(1, GPBDecodeZigZag32(2));
	XCTAssertEqual(-2, GPBDecodeZigZag32(3));
	XCTAssertEqual((int32_t)0x3FFFFFFF, GPBDecodeZigZag32(0x7FFFFFFE));
	XCTAssertEqual((int32_t)0xC0000000, GPBDecodeZigZag32(0x7FFFFFFF));
	XCTAssertEqual((int32_t)0x7FFFFFFF, GPBDecodeZigZag32(0xFFFFFFFE));
	XCTAssertEqual((int32_t)0x80000000, GPBDecodeZigZag32(0xFFFFFFFF));

	XCTAssertEqual((int64_t)0, GPBDecodeZigZag64(0));
	XCTAssertEqual((int64_t)-1, GPBDecodeZigZag64(1));
	XCTAssertEqual((int64_t)1, GPBDecodeZigZag64(2));
	XCTAssertEqual((int64_t)-2, GPBDecodeZigZag64(3));
	XCTAssertEqual((int64_t)0x000000003FFFFFFFL,
	GPBDecodeZigZag64(0x000000007FFFFFFEL));
	XCTAssertEqual((int64_t)0xFFFFFFFFC0000000L,
	GPBDecodeZigZag64(0x000000007FFFFFFFL));
	XCTAssertEqual((int64_t)0x000000007FFFFFFFL,
	GPBDecodeZigZag64(0x00000000FFFFFFFEL));
	XCTAssertEqual((int64_t)0xFFFFFFFF80000000L,
	GPBDecodeZigZag64(0x00000000FFFFFFFFL));
	XCTAssertEqual((int64_t)0x7FFFFFFFFFFFFFFFL,
	GPBDecodeZigZag64(0xFFFFFFFFFFFFFFFEL));
	XCTAssertEqual((int64_t)0x8000000000000000L,
	GPBDecodeZigZag64(0xFFFFFFFFFFFFFFFFL));
	}

	- (void)assertReadVarint:(NSData*)data value:(int64_t)value {
	{
	GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
	XCTAssertEqual((int32_t)value, [input readInt32]);
	}
	{
	GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
	XCTAssertEqual(value, [input readInt64]);
	}
	}

	- (void)assertReadLittleEndian32:(NSData*)data value:(int32_t)value {
	GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
	XCTAssertEqual(value, [input readSFixed32]);
	}

	- (void)assertReadLittleEndian64:(NSData*)data value:(int64_t)value {
	GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
	XCTAssertEqual(value, [input readSFixed64]);
	}

	- (void)assertReadVarintFailure:(NSData*)data {
	{
	GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
	XCTAssertThrows([input readInt32]);
	}
	{
	GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
	XCTAssertThrows([input readInt64]);
	}
	}

	- (void)testBytes {
	NSData* data = bytes(0xa2, 0x74);
	XCTAssertEqual(data.length, (NSUInteger)2);
	XCTAssertEqual(((uint8_t*)data.bytes)[0], (uint8_t)0xa2);
	XCTAssertEqual(((uint8_t*)data.bytes)[1], (uint8_t)0x74);
	}

	- (void)testReadVarint {
	[self assertReadVarint:bytes(0x00) value:0];
	[self assertReadVarint:bytes(0x01) value:1];
	[self assertReadVarint:bytes(0x7f) value:127];
	// 14882
	[self assertReadVarint:bytes(0xa2, 0x74) value:(0x22 << 0) \| (0x74 << 7)];
	// 2961488830
	[self assertReadVarint:bytes(0xbe, 0xf7, 0x92, 0x84, 0x0b)
	value:(0x3e << 0) \| (0x77 << 7) \| (0x12 << 14) \|
	(0x04 << 21) \| (0x0bLL << 28)];

	// 64-bit
	// 7256456126
	[self assertReadVarint:bytes(0xbe, 0xf7, 0x92, 0x84, 0x1b)
	value:(0x3e << 0) \| (0x77 << 7) \| (0x12 << 14) \|
	(0x04 << 21) \| (0x1bLL << 28)];
	// 41256202580718336
	[self assertReadVarint:bytes(0x80, 0xe6, 0xeb, 0x9c, 0xc3, 0xc9, 0xa4, 0x49)
	value:(0x00 << 0) \| (0x66 << 7) \| (0x6b << 14) \|
	(0x1c << 21) \| (0x43LL << 28) \| (0x49LL << 35) \|
	(0x24LL << 42) \| (0x49LL << 49)];
	// 11964378330978735131
	[self
	assertReadVarint:bytes(0x9b, 0xa8, 0xf9, 0xc2, 0xbb, 0xd6, 0x80, 0x85,
	0xa6, 0x01)
	value:(0x1b << 0) \| (0x28 << 7) \| (0x79 << 14) \| (0x42 << 21) \|
	(0x3bLL << 28) \| (0x56LL << 35) \| (0x00LL << 42) \|
	(0x05LL << 49) \| (0x26LL << 56) \| (0x01LL << 63)];

	// Failures
	[self assertReadVarintFailure:bytes(0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
	0x80, 0x80, 0x80, 0x00)];
	[self assertReadVarintFailure:bytes(0x80)];
	}

	- (void)testReadLittleEndian {
	[self assertReadLittleEndian32:bytes(0x78, 0x56, 0x34, 0x12)
	value:0x12345678];
	[self assertReadLittleEndian32:bytes(0xf0, 0xde, 0xbc, 0x9a)
	value:0x9abcdef0];

	[self assertReadLittleEndian64:bytes(0xf0, 0xde, 0xbc, 0x9a, 0x78, 0x56, 0x34,
	0x12)
	value:0x123456789abcdef0LL];
	[self assertReadLittleEndian64:bytes(0x78, 0x56, 0x34, 0x12, 0xf0, 0xde, 0xbc,
	0x9a)
	value:0x9abcdef012345678LL];
	}

	- (void)testReadWholeMessage {
	TestAllTypes* message = [self allSetRepeatedCount:kGPBDefaultRepeatCount];

	NSData* rawBytes = message.data;
	XCTAssertEqual(message.serializedSize, (size_t)rawBytes.length);

	TestAllTypes* message2 =
	[TestAllTypes parseFromData:rawBytes extensionRegistry:nil error:NULL];
	[self assertAllFieldsSet:message2 repeatedCount:kGPBDefaultRepeatCount];
	}

	- (void)testSkipWholeMessage {
	TestAllTypes* message = [self allSetRepeatedCount:kGPBDefaultRepeatCount];
	NSData* rawBytes = message.data;

	// Create two parallel inputs. Parse one as unknown fields while using
	// skipField() to skip each field on the other. Expect the same tags.
	GPBCodedInputStream* input1 = [GPBCodedInputStream streamWithData:rawBytes];
	GPBCodedInputStream* input2 = [GPBCodedInputStream streamWithData:rawBytes];
	GPBUnknownFieldSet* unknownFields =
	[[[GPBUnknownFieldSet alloc] init] autorelease];

	while (YES) {
	int32_t tag = [input1 readTag];
	XCTAssertEqual(tag, [input2 readTag]);
	if (tag == 0) {
	break;
	}
	[unknownFields mergeFieldFrom:tag input:input1];
	[input2 skipField:tag];
	}
	}

	- (void)testReadHugeBlob {
	// Allocate and initialize a 1MB blob.
	NSMutableData* blob = [NSMutableData dataWithLength:1 << 20];
	for (NSUInteger i = 0; i < blob.length; i++) {
	((uint8_t*)blob.mutableBytes)[i] = (uint8_t)i;
	}

	// Make a message containing it.
	TestAllTypes* message = [TestAllTypes message];
	[self setAllFields:message repeatedCount:kGPBDefaultRepeatCount];
	[message setOptionalBytes:blob];

	// Serialize and parse it. Make sure to parse from an InputStream, not
	// directly from a ByteString, so that CodedInputStream uses buffered
	// reading.
	NSData *messageData = message.data;
	XCTAssertNotNil(messageData);
	GPBCodedInputStream* stream =
	[GPBCodedInputStream streamWithData:messageData];
	TestAllTypes* message2 = [TestAllTypes parseFromCodedInputStream:stream
	extensionRegistry:nil
	error:NULL];

	XCTAssertEqualObjects(message.optionalBytes, message2.optionalBytes);

	// Make sure all the other fields were parsed correctly.
	TestAllTypes* message3 = [[message2 copy] autorelease];
	TestAllTypes* types = [self allSetRepeatedCount:kGPBDefaultRepeatCount];
	NSData* data = [types optionalBytes];
	[message3 setOptionalBytes:data];

	[self assertAllFieldsSet:message3 repeatedCount:kGPBDefaultRepeatCount];
	}

	- (void)testReadMaliciouslyLargeBlob {
	NSOutputStream* rawOutput = [NSOutputStream outputStreamToMemory];
	GPBCodedOutputStream* output =
	[GPBCodedOutputStream streamWithOutputStream:rawOutput];

	int32_t tag = GPBWireFormatMakeTag(1, GPBWireFormatLengthDelimited);
	[output writeRawVarint32:tag];
	[output writeRawVarint32:0x7FFFFFFF];
	uint8_t bytes[32] = {0};
	[output writeRawData:[NSData dataWithBytes:bytes length:32]];
	[output flush];

	NSData* data =
	[rawOutput propertyForKey:NSStreamDataWrittenToMemoryStreamKey];
	GPBCodedInputStream* input =
	[GPBCodedInputStream streamWithData:[NSMutableData dataWithData:data]];
	XCTAssertEqual(tag, [input readTag]);

	XCTAssertThrows([input readBytes]);
	}

	// Verifies fix for b/10315336.
	// Note: Now that there isn't a custom string class under the hood, this test
	// isn't as critical, but it does cover bad input and if a custom class is added
	// again, it will help validate that class' handing of bad utf8.
	- (void)testReadMalformedString {
	NSOutputStream* rawOutput = [NSOutputStream outputStreamToMemory];
	GPBCodedOutputStream* output =
	[GPBCodedOutputStream streamWithOutputStream:rawOutput];

	int32_t tag = GPBWireFormatMakeTag(TestAllTypes_FieldNumber_DefaultString,
	GPBWireFormatLengthDelimited);
	[output writeRawVarint32:tag];
	[output writeRawVarint32:5];
	// Create an invalid utf-8 byte array.
	uint8_t bytes[] = {0xc2, 0xf2, 0x0, 0x0, 0x0};
	[output writeRawData:[NSData dataWithBytes:bytes length:sizeof(bytes)]];
	[output flush];

	NSData *data =
	[rawOutput propertyForKey:NSStreamDataWrittenToMemoryStreamKey];
	GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
	NSError *error = nil;
	TestAllTypes* message = [TestAllTypes parseFromCodedInputStream:input
	extensionRegistry:nil
	error:&error];
	XCTAssertNotNil(error);
	XCTAssertNil(message);
	}

	- (void)testBOMWithinStrings {
	// We've seen servers that end up with BOMs within strings (not always at the
	// start, and sometimes in multiple places), make sure they always parse
	// correctly. (Again, this is inpart incase a custom string class is ever
	// used again.)
	const char* strs[] = {
	"\xEF\xBB\xBF String with BOM",
	"String with \xEF\xBB\xBF in middle",
	"String with end bom \xEF\xBB\xBF",
	"\xEF\xBB\xBF\xe2\x99\xa1", // BOM White Heart
	"\xEF\xBB\xBF\xEF\xBB\xBF String with Two BOM",
	};
	for (size_t i = 0; i < GPBARRAYSIZE(strs); ++i) {
	NSOutputStream* rawOutput = [NSOutputStream outputStreamToMemory];
	GPBCodedOutputStream* output =
	[GPBCodedOutputStream streamWithOutputStream:rawOutput];

	int32_t tag = GPBWireFormatMakeTag(TestAllTypes_FieldNumber_DefaultString,
	GPBWireFormatLengthDelimited);
	[output writeRawVarint32:tag];
	size_t length = strlen(strs[i]);
	[output writeRawVarint32:(int32_t)length];
	[output writeRawData:[NSData dataWithBytes:strs[i] length:length]];
	[output flush];

	NSData* data =
	[rawOutput propertyForKey:NSStreamDataWrittenToMemoryStreamKey];
	GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
	TestAllTypes* message = [TestAllTypes parseFromCodedInputStream:input
	extensionRegistry:nil
	error:NULL];
	XCTAssertNotNil(message, @"Loop %zd", i);
	// Ensure the string is there. NSString can consume the BOM in some
	// cases, so don't actually check the string for exact equality.
	XCTAssertTrue(message.defaultString.length > 0, @"Loop %zd", i);
	}
	}

	@end