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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
#import <Foundation/Foundation.h>
#import "GPBExtensionRegistry.h"
@class GPBMessage;
NS_ASSUME_NONNULL_BEGIN
CF_EXTERN_C_BEGIN
/**
* @c GPBCodedInputStream exception name. Exceptions raised from
* @c GPBCodedInputStream contain an underlying error in the userInfo dictionary
* under the GPBCodedInputStreamUnderlyingErrorKey key.
**/
extern NSString *const GPBCodedInputStreamException;
/** The key under which the underlying NSError from the exception is stored. */
extern NSString *const GPBCodedInputStreamUnderlyingErrorKey;
/** NSError domain used for @c GPBCodedInputStream errors. */
extern NSString *const GPBCodedInputStreamErrorDomain;
/**
* Error code for NSError with @c GPBCodedInputStreamErrorDomain.
**/
typedef NS_ENUM(NSInteger, GPBCodedInputStreamErrorCode) {
/** The size does not fit in the remaining bytes to be read. */
GPBCodedInputStreamErrorInvalidSize = -100,
/** Attempted to read beyond the subsection limit. */
GPBCodedInputStreamErrorSubsectionLimitReached = -101,
/** The requested subsection limit is invalid. */
GPBCodedInputStreamErrorInvalidSubsectionLimit = -102,
/** Invalid tag read. */
GPBCodedInputStreamErrorInvalidTag = -103,
/** Invalid UTF-8 character in a string. */
GPBCodedInputStreamErrorInvalidUTF8 = -104,
/** Invalid VarInt read. */
GPBCodedInputStreamErrorInvalidVarInt = -105,
/** The maximum recursion depth of messages was exceeded. */
GPBCodedInputStreamErrorRecursionDepthExceeded = -106,
};
CF_EXTERN_C_END
/**
* Reads and decodes protocol message fields.
*
* The common uses of protocol buffers shouldn't need to use this class.
* @c GPBMessage's provide a @c +parseFromData:error: and
* @c +parseFromData:extensionRegistry:error: method that will decode a
* message for you.
*
* @note Subclassing of @c GPBCodedInputStream is NOT supported.
**/
__attribute__((objc_subclassing_restricted))
@interface GPBCodedInputStream : NSObject
/**
* Creates a new stream wrapping some data.
*
* @param data The data to wrap inside the stream.
*
* @return A newly instanced GPBCodedInputStream.
**/
+ (instancetype)streamWithData:(NSData *)data;
/**
* Initializes a stream wrapping some data.
*
* @param data The data to wrap inside the stream.
*
* @return A newly initialized GPBCodedInputStream.
**/
- (instancetype)initWithData:(NSData *)data;
/**
* Attempts to read a field tag, returning zero if we have reached EOF.
* Protocol message parsers use this to read tags, since a protocol message
* may legally end wherever a tag occurs, and zero is not a valid tag number.
*
* @return The field tag, or zero if EOF was reached.
**/
- (int32_t)readTag;
/**
* @return A double read from the stream.
**/
- (double)readDouble;
/**
* @return A float read from the stream.
**/
- (float)readFloat;
/**
* @return A uint64 read from the stream.
**/
- (uint64_t)readUInt64;
/**
* @return A uint32 read from the stream.
**/
- (uint32_t)readUInt32;
/**
* @return An int64 read from the stream.
**/
- (int64_t)readInt64;
/**
* @return An int32 read from the stream.
**/
- (int32_t)readInt32;
/**
* @return A fixed64 read from the stream.
**/
- (uint64_t)readFixed64;
/**
* @return A fixed32 read from the stream.
**/
- (uint32_t)readFixed32;
/**
* @return An enum read from the stream.
**/
- (int32_t)readEnum;
/**
* @return A sfixed32 read from the stream.
**/
- (int32_t)readSFixed32;
/**
* @return A fixed64 read from the stream.
**/
- (int64_t)readSFixed64;
/**
* @return A sint32 read from the stream.
**/
- (int32_t)readSInt32;
/**
* @return A sint64 read from the stream.
**/
- (int64_t)readSInt64;
/**
* @return A boolean read from the stream.
**/
- (BOOL)readBool;
/**
* @return A string read from the stream.
**/
- (NSString *)readString;
/**
* @return Data read from the stream.
**/
- (NSData *)readBytes;
/**
* Read an embedded message field value from the stream.
*
* @param message The message to set fields on as they are read.
* @param extensionRegistry An optional extension registry to use to lookup
* extensions for message.
**/
- (void)readMessage:(GPBMessage *)message
extensionRegistry:(nullable id<GPBExtensionRegistry>)extensionRegistry;
/**
* Reads and discards a single field, given its tag value.
*
* @param tag The tag number of the field to skip.
*
* @return NO if the tag is an endgroup tag (in which case nothing is skipped),
* YES in all other cases.
**/
- (BOOL)skipField:(int32_t)tag;
/**
* Reads and discards an entire message. This will read either until EOF or
* until an endgroup tag, whichever comes first.
**/
- (void)skipMessage;
/**
* Check to see if the logical end of the stream has been reached.
*
* @note This can return NO when there is no more data, but the current parsing
* expected more data.
*
* @return YES if the logical end of the stream has been reached, NO otherwise.
**/
- (BOOL)isAtEnd;
/**
* @return The offset into the stream.
**/
- (size_t)position;
/**
* Moves the limit to the given byte offset starting at the current location.
*
* @exception GPBCodedInputStreamException If the requested bytes exceed the
* current limit.
*
* @param byteLimit The number of bytes to move the limit, offset to the current
* location.
*
* @return The limit offset before moving the new limit.
*/
- (size_t)pushLimit:(size_t)byteLimit;
/**
* Moves the limit back to the offset as it was before calling pushLimit:.
*
* @param oldLimit The number of bytes to move the current limit. Usually this
* is the value returned by the pushLimit: method.
*/
- (void)popLimit:(size_t)oldLimit;
/**
* @return The number of bytes from the current position to the current limit.
*/
- (size_t)bytesUntilLimit;
/**
* Verifies that the last call to -readTag returned the given tag value. This
* is used to verify that a nested group ended with the correct end tag.
*
* @exception NSParseErrorException If the value does not match the last tag.
*
* @param expected The tag that was expected.
**/
- (void)checkLastTagWas:(int32_t)expected;
@end
NS_ASSUME_NONNULL_END