Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/objectivec/GPBCodedInputStream_PackagePrivate.h

-// 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.
-
-// This header is private to the ProtobolBuffers library and must NOT be
-// included by any sources outside this library. The contents of this file are
-// subject to change at any time without notice.
-
-#import "GPBCodedInputStream.h"
-
-#import <libkern/OSAtomic.h>
-
-@class GPBUnknownFieldSet;
-@class GPBFieldDescriptor;
-
-// GPBString is a string subclass that avoids the overhead of initializing
-// a full NSString until it is actually needed. Lots of protocol buffers contain
-// strings, and instantiating all of those strings and having them parsed to
-// verify correctness when the message was being read was expensive, when many
-// of the strings were never being used.
-//
-// Note for future-self. I tried implementing this using a NSProxy.
-// Turned out the performance was horrible in client apps because folks
-// like to use libraries like SBJSON that grab characters one at a time.
-// The proxy overhead was a killer.
-@interface GPBString : NSString
-@end
-
-typedef struct GPBCodedInputStreamState {
-  const uint8_t *bytes;
-  size_t bufferSize;
-  size_t bufferPos;
-
-  // For parsing subsections of an input stream you can put a hard limit on
-  // how much should be read. Normally the limit is the end of the stream,
-  // but you can adjust it to anywhere, and if you hit it you will be at the
-  // end of the stream, until you adjust the limit.
-  size_t currentLimit;
-  int32_t lastTag;
-  NSUInteger recursionDepth;
-} GPBCodedInputStreamState;
-
-@interface GPBCodedInputStream () {
- @package
-  struct GPBCodedInputStreamState state_;
-  NSData *buffer_;
-}
-
-// Group support is deprecated, so we hide this interface from users, but
-// support for older data.
-- (void)readGroup:(int32_t)fieldNumber
-              message:(GPBMessage *)message
-    extensionRegistry:(GPBExtensionRegistry *)extensionRegistry;
-
-// Reads a group field value from the stream and merges it into the given
-// UnknownFieldSet.
-- (void)readUnknownGroup:(int32_t)fieldNumber
-                 message:(GPBUnknownFieldSet *)message;
-
-// Reads a map entry.
-- (void)readMapEntry:(id)mapDictionary
-    extensionRegistry:(GPBExtensionRegistry *)extensionRegistry
-                field:(GPBFieldDescriptor *)field
-        parentMessage:(GPBMessage *)parentMessage;
-@end
-
-CF_EXTERN_C_BEGIN
-
-// Returns a GPBString with a +1 retain count.
-GPBString *GPBCreateGPBStringWithUTF8(const void *bytes, NSUInteger length)
-    __attribute__((ns_returns_retained));
-
-int32_t GPBCodedInputStreamReadTag(GPBCodedInputStreamState *state);
-
-double GPBCodedInputStreamReadDouble(GPBCodedInputStreamState *state);
-float GPBCodedInputStreamReadFloat(GPBCodedInputStreamState *state);
-uint64_t GPBCodedInputStreamReadUInt64(GPBCodedInputStreamState *state);
-uint32_t GPBCodedInputStreamReadUInt32(GPBCodedInputStreamState *state);
-int64_t GPBCodedInputStreamReadInt64(GPBCodedInputStreamState *state);
-int32_t GPBCodedInputStreamReadInt32(GPBCodedInputStreamState *state);
-uint64_t GPBCodedInputStreamReadFixed64(GPBCodedInputStreamState *state);
-uint32_t GPBCodedInputStreamReadFixed32(GPBCodedInputStreamState *state);
-int32_t GPBCodedInputStreamReadEnum(GPBCodedInputStreamState *state);
-int32_t GPBCodedInputStreamReadSFixed32(GPBCodedInputStreamState *state);
-int64_t GPBCodedInputStreamReadSFixed64(GPBCodedInputStreamState *state);
-int32_t GPBCodedInputStreamReadSInt32(GPBCodedInputStreamState *state);
-int64_t GPBCodedInputStreamReadSInt64(GPBCodedInputStreamState *state);
-BOOL GPBCodedInputStreamReadBool(GPBCodedInputStreamState *state);
-NSString *GPBCodedInputStreamReadRetainedString(GPBCodedInputStreamState *state)
-    __attribute((ns_returns_retained));
-NSData *GPBCodedInputStreamReadRetainedBytes(GPBCodedInputStreamState *state)
-    __attribute((ns_returns_retained));
-NSData *GPBCodedInputStreamReadRetainedBytesNoCopy(
-    GPBCodedInputStreamState *state) __attribute((ns_returns_retained));
-
-size_t GPBCodedInputStreamPushLimit(GPBCodedInputStreamState *state,
-                                    size_t byteLimit);
-void GPBCodedInputStreamPopLimit(GPBCodedInputStreamState *state,
-                                 size_t oldLimit);
-size_t GPBCodedInputStreamBytesUntilLimit(GPBCodedInputStreamState *state);
-BOOL GPBCodedInputStreamIsAtEnd(GPBCodedInputStreamState *state);
-void GPBCodedInputStreamCheckLastTagWas(GPBCodedInputStreamState *state,
-                                        int32_t value);
-
-CF_EXTERN_C_END