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/usr/include/unicode

Name	Size	Mode	Actions
alphaindex.h	27158	0644	edit dl rm
appendable.h	8739	0644	edit dl rm
basictz.h	10163	0644	edit dl rm
brkiter.h	28478	0644	edit dl rm
bytestream.h	11013	0644	edit dl rm
bytestrie.h	21268	0644	edit dl rm
bytestriebuilder.h	7640	0644	edit dl rm
calendar.h	108424	0644	edit dl rm
caniter.h	7621	0644	edit dl rm
casemap.h	25933	0644	edit dl rm
char16ptr.h	7393	0644	edit dl rm
chariter.h	24638	0644	edit dl rm
choicfmt.h	24544	0644	edit dl rm
coleitr.h	14102	0644	edit dl rm
coll.h	57615	0644	edit dl rm
compactdecimalformat.h	7047	0644	edit dl rm
curramt.h	3869	0644	edit dl rm
currpinf.h	7479	0644	edit dl rm
currunit.h	4112	0644	edit dl rm
datefmt.h	41690	0644	edit dl rm
dbbi.h	1223	0644	edit dl rm
dcfmtsym.h	21101	0644	edit dl rm
decimfmt.h	89676	0644	edit dl rm
docmain.h	7380	0644	edit dl rm
dtfmtsym.h	39126	0644	edit dl rm
dtintrv.h	3935	0644	edit dl rm
dtitvfmt.h	50448	0644	edit dl rm
dtitvinf.h	19072	0644	edit dl rm
dtptngen.h	26692	0644	edit dl rm
dtrule.h	8898	0644	edit dl rm
edits.h	21237	0644	edit dl rm
enumset.h	2130	0644	edit dl rm
errorcode.h	4956	0644	edit dl rm
fieldpos.h	8906	0644	edit dl rm
filteredbrk.h	5501	0644	edit dl rm
fmtable.h	25020	0644	edit dl rm
format.h	12802	0644	edit dl rm
formattedvalue.h	9987	0644	edit dl rm
fpositer.h	3107	0644	edit dl rm
gender.h	3408	0644	edit dl rm
gregocal.h	32642	0644	edit dl rm
icudataver.h	1049	0644	edit dl rm
icuplug.h	12109	0644	edit dl rm
idna.h	13000	0644	edit dl rm
listformatter.h	9004	0644	edit dl rm
localebuilder.h	11350	0644	edit dl rm
localematcher.h	27467	0644	edit dl rm
localpointer.h	19825	0644	edit dl rm
locdspnm.h	7292	0644	edit dl rm
locid.h	48804	0644	edit dl rm
measfmt.h	11690	0644	edit dl rm
measunit.h	107613	0644	edit dl rm
measure.h	4431	0644	edit dl rm
messagepattern.h	34517	0644	edit dl rm
msgfmt.h	45278	0644	edit dl rm
normalizer2.h	34466	0644	edit dl rm
normlzr.h	31690	0644	edit dl rm
nounit.h	2305	0644	edit dl rm
numberformatter.h	94505	0644	edit dl rm
numberrangeformatter.h	25790	0644	edit dl rm
numfmt.h	51034	0644	edit dl rm
numsys.h	7509	0644	edit dl rm
parseerr.h	3155	0644	edit dl rm
parsepos.h	5699	0644	edit dl rm
platform.h	28768	0644	edit dl rm
plurfmt.h	25847	0644	edit dl rm
plurrule.h	21316	0644	edit dl rm
ptypes.h	3577	0644	edit dl rm
putil.h	6471	0644	edit dl rm
rbbi.h	28413	0644	edit dl rm
rbnf.h	50021	0644	edit dl rm
rbtz.h	16210	0644	edit dl rm
regex.h	86385	0644	edit dl rm
region.h	9402	0644	edit dl rm
reldatefmt.h	22751	0644	edit dl rm
rep.h	9599	0644	edit dl rm
resbund.h	18513	0644	edit dl rm
schriter.h	6511	0644	edit dl rm
scientificnumberformatter.h	6589	0644	edit dl rm
search.h	22755	0644	edit dl rm
selfmt.h	14686	0644	edit dl rm
simpleformatter.h	12888	0644	edit dl rm
simpletz.h	46798	0644	edit dl rm
smpdtfmt.h	72778	0644	edit dl rm
sortkey.h	11452	0644	edit dl rm
std_string.h	1076	0644	edit dl rm
strenum.h	10157	0644	edit dl rm
stringoptions.h	5926	0644	edit dl rm
stringpiece.h	10287	0644	edit dl rm
stringtriebuilder.h	15842	0644	edit dl rm
stsearch.h	21926	0644	edit dl rm
symtable.h	4374	0644	edit dl rm
tblcoll.h	37801	0644	edit dl rm
timezone.h	44858	0644	edit dl rm
tmunit.h	3479	0644	edit dl rm
tmutamt.h	5029	0644	edit dl rm
tmutfmt.h	7602	0644	edit dl rm
translit.h	67397	0644	edit dl rm
tzfmt.h	43961	0644	edit dl rm
tznames.h	17251	0644	edit dl rm
tzrule.h	36450	0644	edit dl rm
tztrans.h	6278	0644	edit dl rm
ubidi.h	91759	0644	edit dl rm
ubiditransform.h	13003	0644	edit dl rm
ubrk.h	25043	0644	edit dl rm
ucal.h	62463	0644	edit dl rm
ucasemap.h	15579	0644	edit dl rm
ucat.h	5478	0644	edit dl rm
uchar.h	148111	0644	edit dl rm
ucharstrie.h	23066	0644	edit dl rm
ucharstriebuilder.h	7645	0644	edit dl rm
uchriter.h	13747	0644	edit dl rm
uclean.h	11468	0644	edit dl rm
ucnv.h	85051	0644	edit dl rm
ucnvsel.h	6339	0644	edit dl rm
ucnv_cb.h	6738	0644	edit dl rm
ucnv_err.h	21481	0644	edit dl rm
ucol.h	62987	0644	edit dl rm
ucoleitr.h	10056	0644	edit dl rm
uconfig.h	12356	0644	edit dl rm
ucpmap.h	5663	0644	edit dl rm
ucptrie.h	23044	0644	edit dl rm
ucsdet.h	15043	0644	edit dl rm
ucurr.h	17122	0644	edit dl rm
udat.h	63902	0644	edit dl rm
udata.h	16004	0644	edit dl rm
udateintervalformat.h	12218	0644	edit dl rm
udatpg.h	27405	0644	edit dl rm
udisplaycontext.h	6084	0644	edit dl rm
uenum.h	7981	0644	edit dl rm
ufieldpositer.h	4513	0644	edit dl rm
uformattable.h	11233	0644	edit dl rm
uformattedvalue.h	12600	0644	edit dl rm
ugender.h	2106	0644	edit dl rm
uidna.h	34229	0644	edit dl rm
uiter.h	23299	0644	edit dl rm
uldnames.h	10733	0644	edit dl rm
ulistformatter.h	11043	0644	edit dl rm
uloc.h	55936	0644	edit dl rm
ulocdata.h	11572	0644	edit dl rm
umachine.h	16439	0644	edit dl rm
umisc.h	1365	0644	edit dl rm
umsg.h	24832	0644	edit dl rm
umutablecptrie.h	8490	0644	edit dl rm
unifilt.h	4091	0644	edit dl rm
unifunct.h	4151	0644	edit dl rm
unimatch.h	6244	0644	edit dl rm
unirepl.h	3464	0644	edit dl rm
uniset.h	68108	0644	edit dl rm
unistr.h	174627	0644	edit dl rm
unorm.h	21042	0644	edit dl rm
unorm2.h	25269	0644	edit dl rm
unum.h	56269	0644	edit dl rm
unumberformatter.h	31177	0644	edit dl rm
unumberrangeformatter.h	15737	0644	edit dl rm
unumsys.h	7430	0644	edit dl rm
uobject.h	10934	0644	edit dl rm
upluralrules.h	8997	0644	edit dl rm
uregex.h	73719	0644	edit dl rm
uregion.h	10047	0644	edit dl rm
ureldatefmt.h	17448	0644	edit dl rm
urename.h	137853	0644	edit dl rm
urep.h	5507	0644	edit dl rm
ures.h	37418	0644	edit dl rm
uscript.h	28291	0644	edit dl rm
usearch.h	40153	0644	edit dl rm
uset.h	45503	0644	edit dl rm
usetiter.h	9910	0644	edit dl rm
ushape.h	18430	0644	edit dl rm
uspoof.h	67425	0644	edit dl rm
usprep.h	8382	0644	edit dl rm
ustdio.h	39482	0644	edit dl rm
ustream.h	1934	0644	edit dl rm
ustring.h	74096	0644	edit dl rm
ustringtrie.h	3224	0644	edit dl rm
utext.h	59471	0644	edit dl rm
utf.h	8057	0644	edit dl rm
utf8.h	31572	0644	edit dl rm
utf16.h	23910	0644	edit dl rm
utf32.h	763	0644	edit dl rm
utf_old.h	46929	0644	edit dl rm
utmscale.h	14107	0644	edit dl rm
utrace.h	17595	0644	edit dl rm
utrans.h	26157	0644	edit dl rm
utypes.h	31807	0644	edit dl rm
uvernum.h	6839	0644	edit dl rm
uversion.h	6137	0644	edit dl rm
vtzone.h	21303	0644	edit dl rm

Edit: /usr/include/unicode/bytestream.h (11013B)

// © 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"

#if U_SHOW_CPLUSPLUS_API

#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;

/**
   * Appends n bytes to this. Same as Append().
   * Call AppendU8() with u8"string literals" which are const char * in C++11
   * but const char8_t * in C++20.
   * If the compiler does support char8_t as a distinct type,
   * then an AppendU8() overload for that is defined and will be chosen.
   *
   * @param bytes the pointer to the bytes
   * @param n the number of bytes; must be non-negative
   * @stable ICU 67
   */
  inline void AppendU8(const char* bytes, int32_t n) {
    Append(bytes, n);
  }

#if defined(__cpp_char8_t) || defined(U_IN_DOXYGEN)
  /**
   * Appends n bytes to this. Same as Append() but for a const char8_t * pointer.
   * Call AppendU8() with u8"string literals" which are const char * in C++11
   * but const char8_t * in C++20.
   * If the compiler does support char8_t as a distinct type,
   * then this AppendU8() overload for that is defined and will be chosen.
   *
   * @param bytes the pointer to the bytes
   * @param n the number of bytes; must be non-negative
   * @stable ICU 67
   */
  inline void AppendU8(const char8_t* bytes, int32_t n) {
    Append(reinterpret_cast<const char*>(bytes), n);
  }
#endif

/**
   * 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) override;
  /**
   * 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) override;
  /**
   * 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) override { dest_->append(data, n); }
 private:
  StringClass* dest_;

StringByteSink() = delete;
  StringByteSink(const StringByteSink &) = delete;
  StringByteSink &operator=(const StringByteSink &) = delete;
};

U_NAMESPACE_END

#endif /* U_SHOW_CPLUSPLUS_API */

#endif  // __BYTESTREAM_H__

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