131 lines
4.7 KiB
Objective-C
131 lines
4.7 KiB
Objective-C
// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#import <Foundation/Foundation.h>
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@class GPBMessage;
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@class GPBExtensionRegistry;
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NS_ASSUME_NONNULL_BEGIN
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/// Reads and decodes protocol message fields.
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///
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/// The common uses of protocol buffers shouldn't need to use this class.
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/// @c GPBMessage's provide a @c +parseFromData:error: and @c
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/// +parseFromData:extensionRegistry:error: method that will decode a
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/// message for you.
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///
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/// @note Subclassing of GPBCodedInputStream is NOT supported.
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@interface GPBCodedInputStream : NSObject
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/// Creates a new stream wrapping some data.
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+ (instancetype)streamWithData:(NSData *)data;
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/// Initializes a stream wrapping some data.
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- (instancetype)initWithData:(NSData *)data;
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/// Attempt to read a field tag, returning zero if we have reached EOF.
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/// Protocol message parsers use this to read tags, since a protocol message
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/// may legally end wherever a tag occurs, and zero is not a valid tag number.
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- (int32_t)readTag;
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/// Read and return a double.
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- (double)readDouble;
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/// Read and return a float.
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- (float)readFloat;
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/// Read and return a uint64.
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- (uint64_t)readUInt64;
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/// Read and return a uint32.
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- (uint32_t)readUInt32;
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/// Read and return an int64.
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- (int64_t)readInt64;
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/// Read and return an int32.
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- (int32_t)readInt32;
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/// Read and return a fixed64.
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- (uint64_t)readFixed64;
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/// Read and return a fixed32.
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- (uint32_t)readFixed32;
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/// Read and return an enum (int).
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- (int32_t)readEnum;
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/// Read and return a sfixed32.
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- (int32_t)readSFixed32;
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/// Read and return a sfixed64.
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- (int64_t)readSFixed64;
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/// Read and return a sint32.
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- (int32_t)readSInt32;
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/// Read and return a sint64.
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- (int64_t)readSInt64;
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/// Read and return a boolean.
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- (BOOL)readBool;
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/// Read and return a string.
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- (NSString *)readString;
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/// Read and return length delimited data.
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- (NSData *)readBytes;
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/// Read an embedded message field value from the stream.
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///
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/// @param message The message to set fields on as they are read.
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/// @param extensionRegistry An optional extension registry to use to lookup
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/// extensions for @message.
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- (void)readMessage:(GPBMessage *)message
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extensionRegistry:(nullable GPBExtensionRegistry *)extensionRegistry;
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/// Reads and discards a single field, given its tag value.
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///
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/// @param tag The tag number of the field to skip.
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///
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/// @return NO if the tag is an endgroup tag (in which case nothing is skipped),
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/// YES in all other cases.
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- (BOOL)skipField:(int32_t)tag;
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/// Reads and discards an entire message. This will read either until EOF
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/// or until an endgroup tag, whichever comes first.
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- (void)skipMessage;
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/// Check to see if the logical end of the stream has been reached.
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///
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/// This can return NO when there is no more data, but the current parsing
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/// expected more data.
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- (BOOL)isAtEnd;
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/// The offset into the stream.
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- (size_t)position;
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/// Verifies that the last call to @c -readTag returned the given tag value.
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/// This is used to verify that a nested group ended with the correct end tag.
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/// Throws @c NSParseErrorException if value does not match the last tag.
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///
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/// @param expected The tag that was expected.
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- (void)checkLastTagWas:(int32_t)expected;
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@end
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NS_ASSUME_NONNULL_END
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