Restoring authorship annotation for <mcheshkov@yandex-team.ru>. Commit 1 of 2.

1 files changed, 329 insertions, 329 deletions

diff --git a/contrib/libs/icu/common/utf_impl.cpp b/contrib/libs/icu/common/utf_impl.cpp
index 9dd241a12b..bfcdb2c3fc 100644
--- a/contrib/libs/icu/common/utf_impl.cpp
+++ b/contrib/libs/icu/common/utf_impl.cpp
@@ -1,329 +1,329 @@
-// © 2016 and later: Unicode, Inc. and others.
-// License & terms of use: http://www.unicode.org/copyright.html
-/*
-******************************************************************************
-*
-*   Copyright (C) 1999-2012, International Business Machines
-*   Corporation and others.  All Rights Reserved.
-*
-******************************************************************************
-*   file name:  utf_impl.cpp
-*   encoding:   UTF-8
-*   tab size:   8 (not used)
-*   indentation:4
-*
-*   created on: 1999sep13
-*   created by: Markus W. Scherer
-*
-*   This file provides implementation functions for macros in the utfXX.h
-*   that would otherwise be too long as macros.
-*/
-
-/* set import/export definitions */
-#ifndef U_UTF8_IMPL
-#   define U_UTF8_IMPL
-#endif
-
-#include "unicode/utypes.h"
-#include "unicode/utf.h"
-#include "unicode/utf8.h"
-#include "uassert.h"
-
-/*
- * Table of the number of utf8 trail bytes, indexed by the lead byte.
- * Used by the deprecated macro UTF8_COUNT_TRAIL_BYTES, defined in utf_old.h
- *
- * The current macro, U8_COUNT_TRAIL_BYTES, does _not_ use this table.
- *
- * Note that this table cannot be removed, even if UTF8_COUNT_TRAIL_BYTES were
- * changed to no longer use it. References to the table from expansions of UTF8_COUNT_TRAIL_BYTES
- * may exist in old client code that must continue to run with newer icu library versions.
- *
- * This table could be replaced on many machines by
- * a few lines of assembler code using an
- * "index of first 0-bit from msb" instruction and
- * one or two more integer instructions.
- *
- * For example, on an i386, do something like
- * - MOV AL, leadByte
- * - NOT AL         (8-bit, leave b15..b8==0..0, reverse only b7..b0)
- * - MOV AH, 0
- * - BSR BX, AX     (16-bit)
- * - MOV AX, 6      (result)
- * - JZ finish      (ZF==1 if leadByte==0xff)
- * - SUB AX, BX (result)
- * -finish:
- * (BSR: Bit Scan Reverse, scans for a 1-bit, starting from the MSB)
- */
-extern "C" U_EXPORT const uint8_t
-utf8_countTrailBytes[256]={
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-
-    // illegal C0 & C1
-    // 2-byte lead bytes C2..DF
-    0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-
-    // 3-byte lead bytes E0..EF
-    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
-    // 4-byte lead bytes F0..F4
-    // illegal F5..FF
-    3, 3, 3, 3, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
-};
-
-static const UChar32
-utf8_errorValue[6]={
-    // Same values as UTF8_ERROR_VALUE_1, UTF8_ERROR_VALUE_2, UTF_ERROR_VALUE,
-    // but without relying on the obsolete unicode/utf_old.h.
-    0x15, 0x9f, 0xffff,
-    0x10ffff
-};
-
-static UChar32
-errorValue(int32_t count, int8_t strict) {
-    if(strict>=0) {
-        return utf8_errorValue[count];
-    } else if(strict==-3) {
-        return 0xfffd;
-    } else {
-        return U_SENTINEL;
-    }
-}
-
-/*
- * Handle the non-inline part of the U8_NEXT() and U8_NEXT_FFFD() macros
- * and their obsolete sibling UTF8_NEXT_CHAR_SAFE().
- *
- * U8_NEXT() supports NUL-terminated strings indicated via length<0.
- *
- * The "strict" parameter controls the error behavior:
- * <0  "Safe" behavior of U8_NEXT():
- *     -1: All illegal byte sequences yield U_SENTINEL=-1.
- *     -2: Same as -1, except for lenient treatment of surrogate code points as legal.
- *         Some implementations use this for roundtripping of
- *         Unicode 16-bit strings that are not well-formed UTF-16, that is, they
- *         contain unpaired surrogates.
- *     -3: All illegal byte sequences yield U+FFFD.
- *  0  Obsolete "safe" behavior of UTF8_NEXT_CHAR_SAFE(..., FALSE):
- *     All illegal byte sequences yield a positive code point such that this
- *     result code point would be encoded with the same number of bytes as
- *     the illegal sequence.
- * >0  Obsolete "strict" behavior of UTF8_NEXT_CHAR_SAFE(..., TRUE):
- *     Same as the obsolete "safe" behavior, but non-characters are also treated
- *     like illegal sequences.
- *
- * Note that a UBool is the same as an int8_t.
- */
-U_CAPI UChar32 U_EXPORT2
-utf8_nextCharSafeBody(const uint8_t *s, int32_t *pi, int32_t length, UChar32 c, UBool strict) {
-    // *pi is one after byte c.
-    int32_t i=*pi;
-    // length can be negative for NUL-terminated strings: Read and validate one byte at a time.
-    if(i==length || c>0xf4) {
-        // end of string, or not a lead byte
-    } else if(c>=0xf0) {
-        // Test for 4-byte sequences first because
-        // U8_NEXT() handles shorter valid sequences inline.
-        uint8_t t1=s[i], t2, t3;
-        c&=7;
-        if(U8_IS_VALID_LEAD4_AND_T1(c, t1) &&
-                ++i!=length && (t2=s[i]-0x80)<=0x3f &&
-                ++i!=length && (t3=s[i]-0x80)<=0x3f) {
-            ++i;
-            c=(c<<18)|((t1&0x3f)<<12)|(t2<<6)|t3;
-            // strict: forbid non-characters like U+fffe
-            if(strict<=0 || !U_IS_UNICODE_NONCHAR(c)) {
-                *pi=i;
-                return c;
-            }
-        }
-    } else if(c>=0xe0) {
-        c&=0xf;
-        if(strict!=-2) {
-            uint8_t t1=s[i], t2;
-            if(U8_IS_VALID_LEAD3_AND_T1(c, t1) &&
-                    ++i!=length && (t2=s[i]-0x80)<=0x3f) {
-                ++i;
-                c=(c<<12)|((t1&0x3f)<<6)|t2;
-                // strict: forbid non-characters like U+fffe
-                if(strict<=0 || !U_IS_UNICODE_NONCHAR(c)) {
-                    *pi=i;
-                    return c;
-                }
-            }
-        } else {
-            // strict=-2 -> lenient: allow surrogates
-            uint8_t t1=s[i]-0x80, t2;
-            if(t1<=0x3f && (c>0 || t1>=0x20) &&
-                    ++i!=length && (t2=s[i]-0x80)<=0x3f) {
-                *pi=i+1;
-                return (c<<12)|(t1<<6)|t2;
-            }
-        }
-    } else if(c>=0xc2) {
-        uint8_t t1=s[i]-0x80;
-        if(t1<=0x3f) {
-            *pi=i+1;
-            return ((c-0xc0)<<6)|t1;
-        }
-    }  // else 0x80<=c<0xc2 is not a lead byte
-
-    /* error handling */
-    c=errorValue(i-*pi, strict);
-    *pi=i;
-    return c;
-}
-
-U_CAPI int32_t U_EXPORT2
-utf8_appendCharSafeBody(uint8_t *s, int32_t i, int32_t length, UChar32 c, UBool *pIsError) {
-    if((uint32_t)(c)<=0x7ff) {
-        if((i)+1<(length)) {
-            (s)[(i)++]=(uint8_t)(((c)>>6)|0xc0);
-            (s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80);
-            return i;
-        }
-    } else if((uint32_t)(c)<=0xffff) {
-        /* Starting with Unicode 3.2, surrogate code points must not be encoded in UTF-8. */
-        if((i)+2<(length) && !U_IS_SURROGATE(c)) {
-            (s)[(i)++]=(uint8_t)(((c)>>12)|0xe0);
-            (s)[(i)++]=(uint8_t)((((c)>>6)&0x3f)|0x80);
-            (s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80);
-            return i;
-        }
-    } else if((uint32_t)(c)<=0x10ffff) {
-        if((i)+3<(length)) {
-            (s)[(i)++]=(uint8_t)(((c)>>18)|0xf0);
-            (s)[(i)++]=(uint8_t)((((c)>>12)&0x3f)|0x80);
-            (s)[(i)++]=(uint8_t)((((c)>>6)&0x3f)|0x80);
-            (s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80);
-            return i;
-        }
-    }
-    /* c>0x10ffff or not enough space, write an error value */
-    if(pIsError!=NULL) {
-        *pIsError=TRUE;
-    } else {
-        length-=i;
-        if(length>0) {
-            int32_t offset;
-            if(length>3) {
-                length=3;
-            }
-            s+=i;
-            offset=0;
-            c=utf8_errorValue[length-1];
-            U8_APPEND_UNSAFE(s, offset, c);
-            i=i+offset;
-        }
-    }
-    return i;
-}
-
-U_CAPI UChar32 U_EXPORT2
-utf8_prevCharSafeBody(const uint8_t *s, int32_t start, int32_t *pi, UChar32 c, UBool strict) {
-    // *pi is the index of byte c.
-    int32_t i=*pi;
-    if(U8_IS_TRAIL(c) && i>start) {
-        uint8_t b1=s[--i];
-        if(U8_IS_LEAD(b1)) {
-            if(b1<0xe0) {
-                *pi=i;
-                return ((b1-0xc0)<<6)|(c&0x3f);
-            } else if(b1<0xf0 ? U8_IS_VALID_LEAD3_AND_T1(b1, c) : U8_IS_VALID_LEAD4_AND_T1(b1, c)) {
-                // Truncated 3- or 4-byte sequence.
-                *pi=i;
-                return errorValue(1, strict);
-            }
-        } else if(U8_IS_TRAIL(b1) && i>start) {
-            // Extract the value bits from the last trail byte.
-            c&=0x3f;
-            uint8_t b2=s[--i];
-            if(0xe0<=b2 && b2<=0xf4) {
-                if(b2<0xf0) {
-                    b2&=0xf;
-                    if(strict!=-2) {
-                        if(U8_IS_VALID_LEAD3_AND_T1(b2, b1)) {
-                            *pi=i;
-                            c=(b2<<12)|((b1&0x3f)<<6)|c;
-                            if(strict<=0 || !U_IS_UNICODE_NONCHAR(c)) {
-                                return c;
-                            } else {
-                                // strict: forbid non-characters like U+fffe
-                                return errorValue(2, strict);
-                            }
-                        }
-                    } else {
-                        // strict=-2 -> lenient: allow surrogates
-                        b1-=0x80;
-                        if((b2>0 || b1>=0x20)) {
-                            *pi=i;
-                            return (b2<<12)|(b1<<6)|c;
-                        }
-                    }
-                } else if(U8_IS_VALID_LEAD4_AND_T1(b2, b1)) {
-                    // Truncated 4-byte sequence.
-                    *pi=i;
-                    return errorValue(2, strict);
-                }
-            } else if(U8_IS_TRAIL(b2) && i>start) {
-                uint8_t b3=s[--i];
-                if(0xf0<=b3 && b3<=0xf4) {
-                    b3&=7;
-                    if(U8_IS_VALID_LEAD4_AND_T1(b3, b2)) {
-                        *pi=i;
-                        c=(b3<<18)|((b2&0x3f)<<12)|((b1&0x3f)<<6)|c;
-                        if(strict<=0 || !U_IS_UNICODE_NONCHAR(c)) {
-                            return c;
-                        } else {
-                            // strict: forbid non-characters like U+fffe
-                            return errorValue(3, strict);
-                        }
-                    }
-                }
-            }
-        }
-    }
-    return errorValue(0, strict);
-}
-
-U_CAPI int32_t U_EXPORT2
-utf8_back1SafeBody(const uint8_t *s, int32_t start, int32_t i) {
-    // Same as utf8_prevCharSafeBody(..., strict=-1) minus assembling code points.
-    int32_t orig_i=i;
-    uint8_t c=s[i];
-    if(U8_IS_TRAIL(c) && i>start) {
-        uint8_t b1=s[--i];
-        if(U8_IS_LEAD(b1)) {
-            if(b1<0xe0 ||
-                    (b1<0xf0 ? U8_IS_VALID_LEAD3_AND_T1(b1, c) : U8_IS_VALID_LEAD4_AND_T1(b1, c))) {
-                return i;
-            }
-        } else if(U8_IS_TRAIL(b1) && i>start) {
-            uint8_t b2=s[--i];
-            if(0xe0<=b2 && b2<=0xf4) {
-                if(b2<0xf0 ? U8_IS_VALID_LEAD3_AND_T1(b2, b1) : U8_IS_VALID_LEAD4_AND_T1(b2, b1)) {
-                    return i;
-                }
-            } else if(U8_IS_TRAIL(b2) && i>start) {
-                uint8_t b3=s[--i];
-                if(0xf0<=b3 && b3<=0xf4 && U8_IS_VALID_LEAD4_AND_T1(b3, b2)) {
-                    return i;
-                }
-            }
-        }
-    }
-    return orig_i;
-}
+// © 2016 and later: Unicode, Inc. and others. 
+// License & terms of use: http://www.unicode.org/copyright.html 
+/* 
+****************************************************************************** 
+* 
+*   Copyright (C) 1999-2012, International Business Machines 
+*   Corporation and others.  All Rights Reserved. 
+* 
+****************************************************************************** 
+*   file name:  utf_impl.cpp 
+*   encoding:   UTF-8 
+*   tab size:   8 (not used) 
+*   indentation:4 
+* 
+*   created on: 1999sep13 
+*   created by: Markus W. Scherer 
+* 
+*   This file provides implementation functions for macros in the utfXX.h 
+*   that would otherwise be too long as macros. 
+*/ 
+ 
+/* set import/export definitions */ 
+#ifndef U_UTF8_IMPL 
+#   define U_UTF8_IMPL 
+#endif 
+ 
+#include "unicode/utypes.h" 
+#include "unicode/utf.h" 
+#include "unicode/utf8.h" 
+#include "uassert.h" 
+ 
+/* 
+ * Table of the number of utf8 trail bytes, indexed by the lead byte. 
+ * Used by the deprecated macro UTF8_COUNT_TRAIL_BYTES, defined in utf_old.h 
+ * 
+ * The current macro, U8_COUNT_TRAIL_BYTES, does _not_ use this table. 
+ * 
+ * Note that this table cannot be removed, even if UTF8_COUNT_TRAIL_BYTES were 
+ * changed to no longer use it. References to the table from expansions of UTF8_COUNT_TRAIL_BYTES 
+ * may exist in old client code that must continue to run with newer icu library versions. 
+ * 
+ * This table could be replaced on many machines by 
+ * a few lines of assembler code using an 
+ * "index of first 0-bit from msb" instruction and 
+ * one or two more integer instructions. 
+ * 
+ * For example, on an i386, do something like 
+ * - MOV AL, leadByte 
+ * - NOT AL         (8-bit, leave b15..b8==0..0, reverse only b7..b0) 
+ * - MOV AH, 0 
+ * - BSR BX, AX     (16-bit) 
+ * - MOV AX, 6      (result) 
+ * - JZ finish      (ZF==1 if leadByte==0xff) 
+ * - SUB AX, BX (result) 
+ * -finish: 
+ * (BSR: Bit Scan Reverse, scans for a 1-bit, starting from the MSB) 
+ */ 
+extern "C" U_EXPORT const uint8_t 
+utf8_countTrailBytes[256]={ 
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+ 
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+ 
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+ 
+    // illegal C0 & C1 
+    // 2-byte lead bytes C2..DF 
+    0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 
+ 
+    // 3-byte lead bytes E0..EF 
+    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 
+    // 4-byte lead bytes F0..F4 
+    // illegal F5..FF 
+    3, 3, 3, 3, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 
+}; 
+ 
+static const UChar32 
+utf8_errorValue[6]={ 
+    // Same values as UTF8_ERROR_VALUE_1, UTF8_ERROR_VALUE_2, UTF_ERROR_VALUE, 
+    // but without relying on the obsolete unicode/utf_old.h. 
+    0x15, 0x9f, 0xffff, 
+    0x10ffff 
+}; 
+ 
+static UChar32 
+errorValue(int32_t count, int8_t strict) { 
+    if(strict>=0) { 
+        return utf8_errorValue[count]; 
+    } else if(strict==-3) { 
+        return 0xfffd; 
+    } else { 
+        return U_SENTINEL; 
+    } 
+} 
+ 
+/* 
+ * Handle the non-inline part of the U8_NEXT() and U8_NEXT_FFFD() macros 
+ * and their obsolete sibling UTF8_NEXT_CHAR_SAFE(). 
+ * 
+ * U8_NEXT() supports NUL-terminated strings indicated via length<0. 
+ * 
+ * The "strict" parameter controls the error behavior: 
+ * <0  "Safe" behavior of U8_NEXT(): 
+ *     -1: All illegal byte sequences yield U_SENTINEL=-1. 
+ *     -2: Same as -1, except for lenient treatment of surrogate code points as legal. 
+ *         Some implementations use this for roundtripping of 
+ *         Unicode 16-bit strings that are not well-formed UTF-16, that is, they 
+ *         contain unpaired surrogates. 
+ *     -3: All illegal byte sequences yield U+FFFD. 
+ *  0  Obsolete "safe" behavior of UTF8_NEXT_CHAR_SAFE(..., FALSE): 
+ *     All illegal byte sequences yield a positive code point such that this 
+ *     result code point would be encoded with the same number of bytes as 
+ *     the illegal sequence. 
+ * >0  Obsolete "strict" behavior of UTF8_NEXT_CHAR_SAFE(..., TRUE): 
+ *     Same as the obsolete "safe" behavior, but non-characters are also treated 
+ *     like illegal sequences. 
+ * 
+ * Note that a UBool is the same as an int8_t. 
+ */ 
+U_CAPI UChar32 U_EXPORT2 
+utf8_nextCharSafeBody(const uint8_t *s, int32_t *pi, int32_t length, UChar32 c, UBool strict) { 
+    // *pi is one after byte c. 
+    int32_t i=*pi; 
+    // length can be negative for NUL-terminated strings: Read and validate one byte at a time. 
+    if(i==length || c>0xf4) { 
+        // end of string, or not a lead byte 
+    } else if(c>=0xf0) { 
+        // Test for 4-byte sequences first because 
+        // U8_NEXT() handles shorter valid sequences inline. 
+        uint8_t t1=s[i], t2, t3; 
+        c&=7; 
+        if(U8_IS_VALID_LEAD4_AND_T1(c, t1) && 
+                ++i!=length && (t2=s[i]-0x80)<=0x3f && 
+                ++i!=length && (t3=s[i]-0x80)<=0x3f) { 
+            ++i; 
+            c=(c<<18)|((t1&0x3f)<<12)|(t2<<6)|t3; 
+            // strict: forbid non-characters like U+fffe 
+            if(strict<=0 || !U_IS_UNICODE_NONCHAR(c)) { 
+                *pi=i; 
+                return c; 
+            } 
+        } 
+    } else if(c>=0xe0) { 
+        c&=0xf; 
+        if(strict!=-2) { 
+            uint8_t t1=s[i], t2; 
+            if(U8_IS_VALID_LEAD3_AND_T1(c, t1) && 
+                    ++i!=length && (t2=s[i]-0x80)<=0x3f) { 
+                ++i; 
+                c=(c<<12)|((t1&0x3f)<<6)|t2; 
+                // strict: forbid non-characters like U+fffe 
+                if(strict<=0 || !U_IS_UNICODE_NONCHAR(c)) { 
+                    *pi=i; 
+                    return c; 
+                } 
+            } 
+        } else { 
+            // strict=-2 -> lenient: allow surrogates 
+            uint8_t t1=s[i]-0x80, t2; 
+            if(t1<=0x3f && (c>0 || t1>=0x20) && 
+                    ++i!=length && (t2=s[i]-0x80)<=0x3f) { 
+                *pi=i+1; 
+                return (c<<12)|(t1<<6)|t2; 
+            } 
+        } 
+    } else if(c>=0xc2) { 
+        uint8_t t1=s[i]-0x80; 
+        if(t1<=0x3f) { 
+            *pi=i+1; 
+            return ((c-0xc0)<<6)|t1; 
+        } 
+    }  // else 0x80<=c<0xc2 is not a lead byte 
+ 
+    /* error handling */ 
+    c=errorValue(i-*pi, strict); 
+    *pi=i; 
+    return c; 
+} 
+ 
+U_CAPI int32_t U_EXPORT2 
+utf8_appendCharSafeBody(uint8_t *s, int32_t i, int32_t length, UChar32 c, UBool *pIsError) { 
+    if((uint32_t)(c)<=0x7ff) { 
+        if((i)+1<(length)) { 
+            (s)[(i)++]=(uint8_t)(((c)>>6)|0xc0); 
+            (s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80); 
+            return i; 
+        } 
+    } else if((uint32_t)(c)<=0xffff) { 
+        /* Starting with Unicode 3.2, surrogate code points must not be encoded in UTF-8. */ 
+        if((i)+2<(length) && !U_IS_SURROGATE(c)) { 
+            (s)[(i)++]=(uint8_t)(((c)>>12)|0xe0); 
+            (s)[(i)++]=(uint8_t)((((c)>>6)&0x3f)|0x80); 
+            (s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80); 
+            return i; 
+        } 
+    } else if((uint32_t)(c)<=0x10ffff) { 
+        if((i)+3<(length)) { 
+            (s)[(i)++]=(uint8_t)(((c)>>18)|0xf0); 
+            (s)[(i)++]=(uint8_t)((((c)>>12)&0x3f)|0x80); 
+            (s)[(i)++]=(uint8_t)((((c)>>6)&0x3f)|0x80); 
+            (s)[(i)++]=(uint8_t)(((c)&0x3f)|0x80); 
+            return i; 
+        } 
+    } 
+    /* c>0x10ffff or not enough space, write an error value */ 
+    if(pIsError!=NULL) { 
+        *pIsError=TRUE; 
+    } else { 
+        length-=i; 
+        if(length>0) { 
+            int32_t offset; 
+            if(length>3) { 
+                length=3; 
+            } 
+            s+=i; 
+            offset=0; 
+            c=utf8_errorValue[length-1]; 
+            U8_APPEND_UNSAFE(s, offset, c); 
+            i=i+offset; 
+        } 
+    } 
+    return i; 
+} 
+ 
+U_CAPI UChar32 U_EXPORT2 
+utf8_prevCharSafeBody(const uint8_t *s, int32_t start, int32_t *pi, UChar32 c, UBool strict) { 
+    // *pi is the index of byte c. 
+    int32_t i=*pi; 
+    if(U8_IS_TRAIL(c) && i>start) { 
+        uint8_t b1=s[--i]; 
+        if(U8_IS_LEAD(b1)) { 
+            if(b1<0xe0) { 
+                *pi=i; 
+                return ((b1-0xc0)<<6)|(c&0x3f); 
+            } else if(b1<0xf0 ? U8_IS_VALID_LEAD3_AND_T1(b1, c) : U8_IS_VALID_LEAD4_AND_T1(b1, c)) { 
+                // Truncated 3- or 4-byte sequence. 
+                *pi=i; 
+                return errorValue(1, strict); 
+            } 
+        } else if(U8_IS_TRAIL(b1) && i>start) { 
+            // Extract the value bits from the last trail byte. 
+            c&=0x3f; 
+            uint8_t b2=s[--i]; 
+            if(0xe0<=b2 && b2<=0xf4) { 
+                if(b2<0xf0) { 
+                    b2&=0xf; 
+                    if(strict!=-2) { 
+                        if(U8_IS_VALID_LEAD3_AND_T1(b2, b1)) { 
+                            *pi=i; 
+                            c=(b2<<12)|((b1&0x3f)<<6)|c; 
+                            if(strict<=0 || !U_IS_UNICODE_NONCHAR(c)) { 
+                                return c; 
+                            } else { 
+                                // strict: forbid non-characters like U+fffe 
+                                return errorValue(2, strict); 
+                            } 
+                        } 
+                    } else { 
+                        // strict=-2 -> lenient: allow surrogates 
+                        b1-=0x80; 
+                        if((b2>0 || b1>=0x20)) { 
+                            *pi=i; 
+                            return (b2<<12)|(b1<<6)|c; 
+                        } 
+                    } 
+                } else if(U8_IS_VALID_LEAD4_AND_T1(b2, b1)) { 
+                    // Truncated 4-byte sequence. 
+                    *pi=i; 
+                    return errorValue(2, strict); 
+                } 
+            } else if(U8_IS_TRAIL(b2) && i>start) { 
+                uint8_t b3=s[--i]; 
+                if(0xf0<=b3 && b3<=0xf4) { 
+                    b3&=7; 
+                    if(U8_IS_VALID_LEAD4_AND_T1(b3, b2)) { 
+                        *pi=i; 
+                        c=(b3<<18)|((b2&0x3f)<<12)|((b1&0x3f)<<6)|c; 
+                        if(strict<=0 || !U_IS_UNICODE_NONCHAR(c)) { 
+                            return c; 
+                        } else { 
+                            // strict: forbid non-characters like U+fffe 
+                            return errorValue(3, strict); 
+                        } 
+                    } 
+                } 
+            } 
+        } 
+    } 
+    return errorValue(0, strict); 
+} 
+ 
+U_CAPI int32_t U_EXPORT2 
+utf8_back1SafeBody(const uint8_t *s, int32_t start, int32_t i) { 
+    // Same as utf8_prevCharSafeBody(..., strict=-1) minus assembling code points. 
+    int32_t orig_i=i; 
+    uint8_t c=s[i]; 
+    if(U8_IS_TRAIL(c) && i>start) { 
+        uint8_t b1=s[--i]; 
+        if(U8_IS_LEAD(b1)) { 
+            if(b1<0xe0 || 
+                    (b1<0xf0 ? U8_IS_VALID_LEAD3_AND_T1(b1, c) : U8_IS_VALID_LEAD4_AND_T1(b1, c))) { 
+                return i; 
+            } 
+        } else if(U8_IS_TRAIL(b1) && i>start) { 
+            uint8_t b2=s[--i]; 
+            if(0xe0<=b2 && b2<=0xf4) { 
+                if(b2<0xf0 ? U8_IS_VALID_LEAD3_AND_T1(b2, b1) : U8_IS_VALID_LEAD4_AND_T1(b2, b1)) { 
+                    return i; 
+                } 
+            } else if(U8_IS_TRAIL(b2) && i>start) { 
+                uint8_t b3=s[--i]; 
+                if(0xf0<=b3 && b3<=0xf4 && U8_IS_VALID_LEAD4_AND_T1(b3, b2)) { 
+                    return i; 
+                } 
+            } 
+        } 
+    } 
+    return orig_i; 
+}