icuSources/common/bytesinkutil.h

   1 // © 2017 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3
   4 // bytesinkutil.h
   5 // created: 2017sep14 Markus W. Scherer
   6
   7 #include "unicode/utypes.h"
   8 #include "unicode/bytestream.h"
   9 #include "unicode/edits.h"
  10 #include "cmemory.h"
  11 #include "uassert.h"
  12
  13 U_NAMESPACE_BEGIN
  14
  15 class ByteSink;
  16 class CharString;
  17 class Edits;
  18
  19 class U_COMMON_API ByteSinkUtil {
  20 public:
  21     ByteSinkUtil() = delete;  // all static
  22
  23     /** (length) bytes were mapped to valid (s16, s16Length). */
  24     static UBool appendChange(int32_t length,
  25                               const char16_t *s16, int32_t s16Length,
  26                               ByteSink &sink, Edits *edits, UErrorCode &errorCode);
  27
  28     /** The bytes at [s, limit[ were mapped to valid (s16, s16Length). */
  29     static UBool appendChange(const uint8_t *s, const uint8_t *limit,
  30                               const char16_t *s16, int32_t s16Length,
  31                               ByteSink &sink, Edits *edits, UErrorCode &errorCode);
  32
  33     /** (length) bytes were mapped/changed to valid code point c. */
  34     static void appendCodePoint(int32_t length, UChar32 c, ByteSink &sink, Edits *edits = nullptr);
  35
  36     /** The few bytes at [src, nextSrc[ were mapped/changed to valid code point c. */
  37     static inline void appendCodePoint(const uint8_t *src, const uint8_t *nextSrc, UChar32 c,
  38                                        ByteSink &sink, Edits *edits = nullptr) {
  39         appendCodePoint((int32_t)(nextSrc - src), c, sink, edits);
  40     }
  41
  42     /** Append the two-byte character (U+0080..U+07FF). */
  43     static void appendTwoBytes(UChar32 c, ByteSink &sink);
  44
  45     static UBool appendUnchanged(const uint8_t *s, int32_t length,
  46                                  ByteSink &sink, uint32_t options, Edits *edits,
  47                                  UErrorCode &errorCode) {
  48         if (U_FAILURE(errorCode)) { return FALSE; }
  49         if (length > 0) { appendNonEmptyUnchanged(s, length, sink, options, edits); }
  50         return TRUE;
  51     }
  52
  53     static UBool appendUnchanged(const uint8_t *s, const uint8_t *limit,
  54                                  ByteSink &sink, uint32_t options, Edits *edits,
  55                                  UErrorCode &errorCode);
  56
  57 private:
  58     static void appendNonEmptyUnchanged(const uint8_t *s, int32_t length,
  59                                         ByteSink &sink, uint32_t options, Edits *edits);
  60 };
  61
  62 class U_COMMON_API CharStringByteSink : public ByteSink {
  63 public:
  64     CharStringByteSink(CharString* dest);
  65     ~CharStringByteSink() override;
  66
  67     CharStringByteSink() = delete;
  68     CharStringByteSink(const CharStringByteSink&) = delete;
  69     CharStringByteSink& operator=(const CharStringByteSink&) = delete;
  70
  71     void Append(const char* bytes, int32_t n) override;
  72
  73     char* GetAppendBuffer(int32_t min_capacity,
  74                           int32_t desired_capacity_hint,
  75                           char* scratch,
  76                           int32_t scratch_capacity,
  77                           int32_t* result_capacity) override;
  78
  79 private:
  80     CharString& dest_;
  81 };
  82
  83 U_NAMESPACE_END