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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 
appendUnchanged(const uint8_t * s,int32_t length,ByteSink & sink,uint32_t options,Edits * edits,UErrorCode & errorCode)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
84