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Diffstat (limited to 'NorthstarDedicatedTest/include/protobuf/stubs/bytestream.h')
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diff --git a/NorthstarDedicatedTest/include/protobuf/stubs/bytestream.h b/NorthstarDedicatedTest/include/protobuf/stubs/bytestream.h new file mode 100644 index 00000000..b22dd2af --- /dev/null +++ b/NorthstarDedicatedTest/include/protobuf/stubs/bytestream.h @@ -0,0 +1,351 @@ +// 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 file declares the ByteSink and ByteSource abstract interfaces. These +// interfaces represent objects that consume (ByteSink) or produce (ByteSource) +// a sequence of bytes. Using these abstract interfaces in your APIs can help +// make your code work with a variety of input and output types. +// +// This file also declares the following commonly used implementations of these +// interfaces. +// +// ByteSink: +// UncheckedArrayByteSink Writes to an array, without bounds checking +// CheckedArrayByteSink Writes to an array, with bounds checking +// GrowingArrayByteSink Allocates and writes to a growable buffer +// StringByteSink Writes to an STL string +// NullByteSink Consumes a never-ending stream of bytes +// +// ByteSource: +// ArrayByteSource Reads from an array or string/StringPiece +// LimitedByteSource Limits the number of bytes read from an + +#ifndef GOOGLE_PROTOBUF_STUBS_BYTESTREAM_H_ +#define GOOGLE_PROTOBUF_STUBS_BYTESTREAM_H_ + +#include <stddef.h> +#include <string> + +#include <stubs/common.h> +#include <stubs/stringpiece.h> + +#include <port_def.inc> + +class CordByteSink; + +namespace google { +namespace protobuf { +namespace strings { + +// An abstract interface for an object that consumes a sequence of bytes. This +// interface offers a way to append data as well as a Flush() function. +// +// Example: +// +// string my_data; +// ... +// ByteSink* sink = ... +// sink->Append(my_data.data(), my_data.size()); +// sink->Flush(); +// +class PROTOBUF_EXPORT ByteSink { + public: + ByteSink() {} + virtual ~ByteSink() {} + + // Appends the "n" bytes starting at "bytes". + virtual void Append(const char* bytes, size_t n) = 0; + + // Flushes internal buffers. The default implementation does nothing. ByteSink + // subclasses may use internal buffers that require calling Flush() at the end + // of the stream. + virtual void Flush(); + + private: + GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ByteSink); +}; + +// An abstract interface for an object that produces a fixed-size sequence of +// bytes. +// +// Example: +// +// ByteSource* source = ... +// while (source->Available() > 0) { +// StringPiece data = source->Peek(); +// ... do something with "data" ... +// source->Skip(data.length()); +// } +// +class PROTOBUF_EXPORT ByteSource { + public: + ByteSource() {} + virtual ~ByteSource() {} + + // Returns the number of bytes left to read from the source. Available() + // should decrease by N each time Skip(N) is called. Available() may not + // increase. Available() returning 0 indicates that the ByteSource is + // exhausted. + // + // Note: Size() may have been a more appropriate name as it's more + // indicative of the fixed-size nature of a ByteSource. + virtual size_t Available() const = 0; + + // Returns a StringPiece of the next contiguous region of the source. Does not + // reposition the source. The returned region is empty iff Available() == 0. + // + // The returned region is valid until the next call to Skip() or until this + // object is destroyed, whichever occurs first. + // + // The length of the returned StringPiece will be <= Available(). + virtual StringPiece Peek() = 0; + + // Skips the next n bytes. Invalidates any StringPiece returned by a previous + // call to Peek(). + // + // REQUIRES: Available() >= n + virtual void Skip(size_t n) = 0; + + // Writes the next n bytes in this ByteSource to the given ByteSink, and + // advances this ByteSource past the copied bytes. The default implementation + // of this method just copies the bytes normally, but subclasses might + // override CopyTo to optimize certain cases. + // + // REQUIRES: Available() >= n + virtual void CopyTo(ByteSink* sink, size_t n); + + private: + GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ByteSource); +}; + +// +// Some commonly used implementations of ByteSink +// + +// Implementation of ByteSink that writes to an unsized byte array. No +// bounds-checking is performed--it is the caller's responsibility to ensure +// that the destination array is large enough. +// +// Example: +// +// char buf[10]; +// UncheckedArrayByteSink sink(buf); +// sink.Append("hi", 2); // OK +// sink.Append(data, 100); // WOOPS! Overflows buf[10]. +// +class PROTOBUF_EXPORT UncheckedArrayByteSink : public ByteSink { + public: + explicit UncheckedArrayByteSink(char* dest) : dest_(dest) {} + virtual void Append(const char* data, size_t n) override; + + // Returns the current output pointer so that a caller can see how many bytes + // were produced. + // + // Note: this method is not part of the ByteSink interface. + char* CurrentDestination() const { return dest_; } + + private: + char* dest_; + GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(UncheckedArrayByteSink); +}; + +// Implementation of ByteSink that writes to a sized byte array. This sink will +// not write more than "capacity" bytes to outbuf. Once "capacity" bytes are +// appended, subsequent bytes will be ignored and Overflowed() will return true. +// Overflowed() does not cause a runtime error (i.e., it does not CHECK fail). +// +// Example: +// +// char buf[10]; +// CheckedArrayByteSink sink(buf, 10); +// sink.Append("hi", 2); // OK +// sink.Append(data, 100); // Will only write 8 more bytes +// +class PROTOBUF_EXPORT CheckedArrayByteSink : public ByteSink { + public: + CheckedArrayByteSink(char* outbuf, size_t capacity); + virtual void Append(const char* bytes, size_t n) override; + + // Returns the number of bytes actually written to the sink. + size_t NumberOfBytesWritten() const { return size_; } + + // Returns true if any bytes were discarded, i.e., if there was an + // attempt to write more than 'capacity' bytes. + bool Overflowed() const { return overflowed_; } + + private: + char* outbuf_; + const size_t capacity_; + size_t size_; + bool overflowed_; + GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(CheckedArrayByteSink); +}; + +// Implementation of ByteSink that allocates an internal buffer (a char array) +// and expands it as needed to accommodate appended data (similar to a string), +// and allows the caller to take ownership of the internal buffer via the +// GetBuffer() method. The buffer returned from GetBuffer() must be deleted by +// the caller with delete[]. GetBuffer() also sets the internal buffer to be +// empty, and subsequent appends to the sink will create a new buffer. The +// destructor will free the internal buffer if GetBuffer() was not called. +// +// Example: +// +// GrowingArrayByteSink sink(10); +// sink.Append("hi", 2); +// sink.Append(data, n); +// const char* buf = sink.GetBuffer(); // Ownership transferred +// delete[] buf; +// +class PROTOBUF_EXPORT GrowingArrayByteSink : public strings::ByteSink { + public: + explicit GrowingArrayByteSink(size_t estimated_size); + virtual ~GrowingArrayByteSink(); + virtual void Append(const char* bytes, size_t n) override; + + // Returns the allocated buffer, and sets nbytes to its size. The caller takes + // ownership of the buffer and must delete it with delete[]. + char* GetBuffer(size_t* nbytes); + + private: + void Expand(size_t amount); + void ShrinkToFit(); + + size_t capacity_; + char* buf_; + size_t size_; + GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(GrowingArrayByteSink); +}; + +// Implementation of ByteSink that appends to the given string. +// Existing contents of "dest" are not modified; new data is appended. +// +// Example: +// +// string dest = "Hello "; +// StringByteSink sink(&dest); +// sink.Append("World", 5); +// assert(dest == "Hello World"); +// +class PROTOBUF_EXPORT StringByteSink : public ByteSink { + public: + explicit StringByteSink(std::string* dest) : dest_(dest) {} + virtual void Append(const char* data, size_t n) override; + + private: + std::string* dest_; + GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(StringByteSink); +}; + +// Implementation of ByteSink that discards all data. +// +// Example: +// +// NullByteSink sink; +// sink.Append(data, data.size()); // All data ignored. +// +class PROTOBUF_EXPORT NullByteSink : public ByteSink { + public: + NullByteSink() {} + void Append(const char* /*data*/, size_t /*n*/) override {} + + private: + GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(NullByteSink); +}; + +// +// Some commonly used implementations of ByteSource +// + +// Implementation of ByteSource that reads from a StringPiece. +// +// Example: +// +// string data = "Hello"; +// ArrayByteSource source(data); +// assert(source.Available() == 5); +// assert(source.Peek() == "Hello"); +// +class PROTOBUF_EXPORT ArrayByteSource : public ByteSource { + public: + explicit ArrayByteSource(StringPiece s) : input_(s) {} + + virtual size_t Available() const override; + virtual StringPiece Peek() override; + virtual void Skip(size_t n) override; + + private: + StringPiece input_; + GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ArrayByteSource); +}; + +// Implementation of ByteSource that wraps another ByteSource, limiting the +// number of bytes returned. +// +// The caller maintains ownership of the underlying source, and may not use the +// underlying source while using the LimitByteSource object. The underlying +// source's pointer is advanced by n bytes every time this LimitByteSource +// object is advanced by n. +// +// Example: +// +// string data = "Hello World"; +// ArrayByteSource abs(data); +// assert(abs.Available() == data.size()); +// +// LimitByteSource limit(abs, 5); +// assert(limit.Available() == 5); +// assert(limit.Peek() == "Hello"); +// +class PROTOBUF_EXPORT LimitByteSource : public ByteSource { + public: + // Returns at most "limit" bytes from "source". + LimitByteSource(ByteSource* source, size_t limit); + + virtual size_t Available() const override; + virtual StringPiece Peek() override; + virtual void Skip(size_t n) override; + + // We override CopyTo so that we can forward to the underlying source, in + // case it has an efficient implementation of CopyTo. + virtual void CopyTo(ByteSink* sink, size_t n) override; + + private: + ByteSource* source_; + size_t limit_; +}; + +} // namespace strings +} // namespace protobuf +} // namespace google + +#include <port_undef.inc> + +#endif // GOOGLE_PROTOBUF_STUBS_BYTESTREAM_H_ |