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diff --git a/Build/source/libs/icu/icu-src/source/common/bytesinkutil.h b/Build/source/libs/icu/icu-src/source/common/bytesinkutil.h
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+// © 2017 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+
+// bytesinkutil.h
+// created: 2017sep14 Markus W. Scherer
+
+#include "unicode/utypes.h"
+#include "unicode/bytestream.h"
+#include "unicode/edits.h"
+#include "cmemory.h"
+#include "uassert.h"
+
+U_NAMESPACE_BEGIN
+
+class ByteSink;
+class Edits;
+
+class U_COMMON_API ByteSinkUtil {
+public:
+ ByteSinkUtil() = delete; // all static
+
+ /** (length) bytes were mapped to valid (s16, s16Length). */
+ static UBool appendChange(int32_t length,
+ const char16_t *s16, int32_t s16Length,
+ ByteSink &sink, Edits *edits, UErrorCode &errorCode);
+
+ /** The bytes at [s, limit[ were mapped to valid (s16, s16Length). */
+ static UBool appendChange(const uint8_t *s, const uint8_t *limit,
+ const char16_t *s16, int32_t s16Length,
+ ByteSink &sink, Edits *edits, UErrorCode &errorCode);
+
+ /** (length) bytes were mapped/changed to valid code point c. */
+ static void appendCodePoint(int32_t length, UChar32 c, ByteSink &sink, Edits *edits = nullptr);
+
+ /** The few bytes at [src, nextSrc[ were mapped/changed to valid code point c. */
+ static inline void appendCodePoint(const uint8_t *src, const uint8_t *nextSrc, UChar32 c,
+ ByteSink &sink, Edits *edits = nullptr) {
+ appendCodePoint((int32_t)(nextSrc - src), c, sink, edits);
+ }
+
+ /** Append the two-byte character (U+0080..U+07FF). */
+ static void appendTwoBytes(UChar32 c, ByteSink &sink);
+
+ static UBool appendUnchanged(const uint8_t *s, int32_t length,
+ ByteSink &sink, uint32_t options, Edits *edits,
+ UErrorCode &errorCode);
+
+ static UBool appendUnchanged(const uint8_t *s, const uint8_t *limit,
+ ByteSink &sink, uint32_t options, Edits *edits,
+ UErrorCode &errorCode);
+};
+
+U_NAMESPACE_END