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-// © 2016 and later: Unicode, Inc. and others.
-// License & terms of use: http://www.unicode.org/copyright.html
-// Copyright (C) 2009-2012, International Business Machines
-// Corporation and others. All Rights Reserved.
-//
-// Copyright 2007 Google Inc. All Rights Reserved.
-// Author: sanjay@google.com (Sanjay Ghemawat)
-//
-// Abstract interface that consumes a sequence of bytes (ByteSink).
-//
-// Used so that we can write a single piece of code that can operate
-// on a variety of output string types.
-//
-// Various implementations of this interface are provided:
-// ByteSink:
-// CheckedArrayByteSink Write to a flat array, with bounds checking
-// StringByteSink Write to an STL string
-
-// This code is a contribution of Google code, and the style used here is
-// a compromise between the original Google code and the ICU coding guidelines.
-// For example, data types are ICU-ified (size_t,int->int32_t),
-// and API comments doxygen-ified, but function names and behavior are
-// as in the original, if possible.
-// Assertion-style error handling, not available in ICU, was changed to
-// parameter "pinning" similar to UnicodeString.
-//
-// In addition, this is only a partial port of the original Google code,
-// limited to what was needed so far. The (nearly) complete original code
-// is in the ICU svn repository at icuhtml/trunk/design/strings/contrib
-// (see ICU ticket 6765, r25517).
-
-#ifndef __BYTESTREAM_H__
-#define __BYTESTREAM_H__
-
-/**
- * \file
- * \brief C++ API: Interface for writing bytes, and implementation classes.
- */
-
-#include "unicode/utypes.h"
-#include "unicode/uobject.h"
-#include "unicode/std_string.h"
-
-U_NAMESPACE_BEGIN
-
-/**
- * A ByteSink can be filled with bytes.
- * @stable ICU 4.2
- */
-class U_COMMON_API ByteSink : public UMemory {
-public:
- /**
- * Default constructor.
- * @stable ICU 4.2
- */
- ByteSink() { }
- /**
- * Virtual destructor.
- * @stable ICU 4.2
- */
- virtual ~ByteSink();
-
- /**
- * Append "bytes[0,n-1]" to this.
- * @param bytes the pointer to the bytes
- * @param n the number of bytes; must be non-negative
- * @stable ICU 4.2
- */
- virtual void Append(const char* bytes, int32_t n) = 0;
-
- /**
- * Returns a writable buffer for appending and writes the buffer's capacity to
- * *result_capacity. Guarantees *result_capacity>=min_capacity.
- * May return a pointer to the caller-owned scratch buffer which must have
- * scratch_capacity>=min_capacity.
- * The returned buffer is only valid until the next operation
- * on this ByteSink.
- *
- * After writing at most *result_capacity bytes, call Append() with the
- * pointer returned from this function and the number of bytes written.
- * Many Append() implementations will avoid copying bytes if this function
- * returned an internal buffer.
- *
- * Partial usage example:
- * int32_t capacity;
- * char* buffer = sink->GetAppendBuffer(..., &capacity);
- * ... Write n bytes into buffer, with n <= capacity.
- * sink->Append(buffer, n);
- * In many implementations, that call to Append will avoid copying bytes.
- *
- * If the ByteSink allocates or reallocates an internal buffer, it should use
- * the desired_capacity_hint if appropriate.
- * If a caller cannot provide a reasonable guess at the desired capacity,
- * it should pass desired_capacity_hint=0.
- *
- * If a non-scratch buffer is returned, the caller may only pass
- * a prefix to it to Append().
- * That is, it is not correct to pass an interior pointer to Append().
- *
- * The default implementation always returns the scratch buffer.
- *
- * @param min_capacity required minimum capacity of the returned buffer;
- * must be non-negative
- * @param desired_capacity_hint desired capacity of the returned buffer;
- * must be non-negative
- * @param scratch default caller-owned buffer
- * @param scratch_capacity capacity of the scratch buffer
- * @param result_capacity pointer to an integer which will be set to the
- * capacity of the returned buffer
- * @return a buffer with *result_capacity>=min_capacity
- * @stable ICU 4.2
- */
- virtual char* GetAppendBuffer(int32_t min_capacity,
- int32_t desired_capacity_hint,
- char* scratch, int32_t scratch_capacity,
- int32_t* result_capacity);
-
- /**
- * Flush internal buffers.
- * Some byte sinks use internal buffers or provide buffering
- * and require calling Flush() at the end of the stream.
- * The ByteSink should be ready for further Append() calls after Flush().
- * The default implementation of Flush() does nothing.
- * @stable ICU 4.2
- */
- virtual void Flush();
-
-private:
- ByteSink(const ByteSink &) = delete;
- ByteSink &operator=(const ByteSink &) = delete;
-};
-
-// -------------------------------------------------------------
-// Some standard implementations
-
-/**
- * Implementation of ByteSink that writes to a flat byte array,
- * with bounds-checking:
- * This sink will not write more than capacity bytes to outbuf.
- * If more than capacity bytes are Append()ed, then excess bytes are ignored,
- * and Overflowed() will return true.
- * Overflow does not cause a runtime error.
- * @stable ICU 4.2
- */
-class U_COMMON_API CheckedArrayByteSink : public ByteSink {
-public:
- /**
- * Constructs a ByteSink that will write to outbuf[0..capacity-1].
- * @param outbuf buffer to write to
- * @param capacity size of the buffer
- * @stable ICU 4.2
- */
- CheckedArrayByteSink(char* outbuf, int32_t capacity);
- /**
- * Destructor.
- * @stable ICU 4.2
- */
- virtual ~CheckedArrayByteSink();
- /**
- * Returns the sink to its original state, without modifying the buffer.
- * Useful for reusing both the buffer and the sink for multiple streams.
- * Resets the state to NumberOfBytesWritten()=NumberOfBytesAppended()=0
- * and Overflowed()=FALSE.
- * @return *this
- * @stable ICU 4.6
- */
- virtual CheckedArrayByteSink& Reset();
- /**
- * Append "bytes[0,n-1]" to this.
- * @param bytes the pointer to the bytes
- * @param n the number of bytes; must be non-negative
- * @stable ICU 4.2
- */
- virtual void Append(const char* bytes, int32_t n);
- /**
- * Returns a writable buffer for appending and writes the buffer's capacity to
- * *result_capacity. For details see the base class documentation.
- * @param min_capacity required minimum capacity of the returned buffer;
- * must be non-negative
- * @param desired_capacity_hint desired capacity of the returned buffer;
- * must be non-negative
- * @param scratch default caller-owned buffer
- * @param scratch_capacity capacity of the scratch buffer
- * @param result_capacity pointer to an integer which will be set to the
- * capacity of the returned buffer
- * @return a buffer with *result_capacity>=min_capacity
- * @stable ICU 4.2
- */
- virtual char* GetAppendBuffer(int32_t min_capacity,
- int32_t desired_capacity_hint,
- char* scratch, int32_t scratch_capacity,
- int32_t* result_capacity);
- /**
- * Returns the number of bytes actually written to the sink.
- * @return number of bytes written to the buffer
- * @stable ICU 4.2
- */
- int32_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.
- * @return TRUE if more than 'capacity' bytes were Append()ed
- * @stable ICU 4.2
- */
- UBool Overflowed() const { return overflowed_; }
- /**
- * Returns the number of bytes appended to the sink.
- * If Overflowed() then NumberOfBytesAppended()>NumberOfBytesWritten()
- * else they return the same number.
- * @return number of bytes written to the buffer
- * @stable ICU 4.6
- */
- int32_t NumberOfBytesAppended() const { return appended_; }
-private:
- char* outbuf_;
- const int32_t capacity_;
- int32_t size_;
- int32_t appended_;
- UBool overflowed_;
-
- CheckedArrayByteSink() = delete;
- CheckedArrayByteSink(const CheckedArrayByteSink &) = delete;
- CheckedArrayByteSink &operator=(const CheckedArrayByteSink &) = delete;
-};
-
-/**
- * Implementation of ByteSink that writes to a "string".
- * The StringClass is usually instantiated with a std::string.
- * @stable ICU 4.2
- */
-template<typename StringClass>
-class StringByteSink : public ByteSink {
- public:
- /**
- * Constructs a ByteSink that will append bytes to the dest string.
- * @param dest pointer to string object to append to
- * @stable ICU 4.2
- */
- StringByteSink(StringClass* dest) : dest_(dest) { }
- /**
- * Constructs a ByteSink that reserves append capacity and will append bytes to the dest string.
- *
- * @param dest pointer to string object to append to
- * @param initialAppendCapacity capacity beyond dest->length() to be reserve()d
- * @stable ICU 60
- */
- StringByteSink(StringClass* dest, int32_t initialAppendCapacity) : dest_(dest) {
- if (initialAppendCapacity > 0 &&
- (uint32_t)initialAppendCapacity > (dest->capacity() - dest->length())) {
- dest->reserve(dest->length() + initialAppendCapacity);
- }
- }
- /**
- * Append "bytes[0,n-1]" to this.
- * @param data the pointer to the bytes
- * @param n the number of bytes; must be non-negative
- * @stable ICU 4.2
- */
- virtual void Append(const char* data, int32_t n) { dest_->append(data, n); }
- private:
- StringClass* dest_;
-
- StringByteSink() = delete;
- StringByteSink(const StringByteSink &) = delete;
- StringByteSink &operator=(const StringByteSink &) = delete;
-};
-
-U_NAMESPACE_END
-
-#endif // __BYTESTREAM_H__