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Diffstat (limited to 'deps/node/deps/icu-small/source/common/utf_impl.cpp')
| -rw-r--r-- | deps/node/deps/icu-small/source/common/utf_impl.cpp | 329 |
1 files changed, 0 insertions, 329 deletions
diff --git a/deps/node/deps/icu-small/source/common/utf_impl.cpp b/deps/node/deps/icu-small/source/common/utf_impl.cpp deleted file mode 100644 index 9dd241a1..00000000 --- a/deps/node/deps/icu-small/source/common/utf_impl.cpp +++ /dev/null @@ -1,329 +0,0 @@ -// © 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; -} |