The Tor Browser: security/sandbox/chromium/base/third_party/icu/icu

security/sandbox/chromium/base/third_party/icu/icu_utf.h@141e0f1194b1 (annotated)

security/sandbox/chromium/base/third_party/icu/icu_utf.h

Wed, 31 Dec 2014 07:16:47 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 07:16:47 +0100
branch: TOR_BUG_9701
changeset 3: 141e0f1194b1
permissions: -rw-r--r--

Revert simplistic fix pending revisit of Mozilla integration attempt.

 /*
 *******************************************************************************
 *
 *   Copyright (C) 1999-2004, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *
 *******************************************************************************
 *   file name:  utf.h
 *   encoding:   US-ASCII
 *   tab size:   8 (not used)
 *   indentation:4
 *
 *   created on: 1999sep09
 *   created by: Markus W. Scherer
 */
 #ifndef BASE_THIRD_PARTY_ICU_ICU_UTF_H_
 #define BASE_THIRD_PARTY_ICU_ICU_UTF_H_
 #include "base/basictypes.h"
 namespace base_icu {
 typedef uint32 UChar32;
 typedef int8 UBool;
 // General ---------------------------------------------------------------------
 // from utf.h
 /**
  * This value is intended for sentinel values for APIs that
  * (take or) return single code points (UChar32).
  * It is outside of the Unicode code point range 0..0x10ffff.
  *
  * For example, a "done" or "error" value in a new API
  * could be indicated with CBU_SENTINEL.
  *
  * ICU APIs designed before ICU 2.4 usually define service-specific "done"
  * values, mostly 0xffff.
  * Those may need to be distinguished from
  * actual U+ffff text contents by calling functions like
  * CharacterIterator::hasNext() or UnicodeString::length().
  *
  * @return -1
  * @see UChar32
  * @stable ICU 2.4
  */
 #define CBU_SENTINEL (-1)
 /**
  * Is this code point a Unicode noncharacter?
  * @param c 32-bit code point
  * @return TRUE or FALSE
  * @stable ICU 2.4
  */
 #define CBU_IS_UNICODE_NONCHAR(c) \
     ((c)>=0xfdd0 && \
      ((uint32)(c)<=0xfdef || ((c)&0xfffe)==0xfffe) && \
      (uint32)(c)<=0x10ffff)
 /**
  * Is c a Unicode code point value (0..U+10ffff)
  * that can be assigned a character?
  *
  * Code points that are not characters include:
  * - single surrogate code points (U+d800..U+dfff, 2048 code points)
  * - the last two code points on each plane (U+__fffe and U+__ffff, 34 code points)
  * - U+fdd0..U+fdef (new with Unicode 3.1, 32 code points)
  * - the highest Unicode code point value is U+10ffff
  *
  * This means that all code points below U+d800 are character code points,
  * and that boundary is tested first for performance.
  *
  * @param c 32-bit code point
  * @return TRUE or FALSE
  * @stable ICU 2.4
  */
 #define CBU_IS_UNICODE_CHAR(c) \
     ((uint32)(c)<0xd800 || \
         ((uint32)(c)>0xdfff && \
          (uint32)(c)<=0x10ffff && \
          !CBU_IS_UNICODE_NONCHAR(c)))
 /**
  * Is this code point a surrogate (U+d800..U+dfff)?
  * @param c 32-bit code point
  * @return TRUE or FALSE
  * @stable ICU 2.4
  */
 #define CBU_IS_SURROGATE(c) (((c)&0xfffff800)==0xd800)
 /**
  * Assuming c is a surrogate code point (U_IS_SURROGATE(c)),
  * is it a lead surrogate?
  * @param c 32-bit code point
  * @return TRUE or FALSE
  * @stable ICU 2.4
  */
 #define CBU_IS_SURROGATE_LEAD(c) (((c)&0x400)==0)
 // UTF-8 macros ----------------------------------------------------------------
 // from utf8.h
 extern const uint8 utf8_countTrailBytes[256];
 /**
  * Count the trail bytes for a UTF-8 lead byte.
  * @internal
  */
 #define CBU8_COUNT_TRAIL_BYTES(leadByte) (base_icu::utf8_countTrailBytes[(uint8)leadByte])
 /**
  * Mask a UTF-8 lead byte, leave only the lower bits that form part of the code point value.
  * @internal
  */
 #define CBU8_MASK_LEAD_BYTE(leadByte, countTrailBytes) ((leadByte)&=(1<<(6-(countTrailBytes)))-1)
 /**
  * Does this code unit (byte) encode a code point by itself (US-ASCII 0..0x7f)?
  * @param c 8-bit code unit (byte)
  * @return TRUE or FALSE
  * @stable ICU 2.4
  */
 #define CBU8_IS_SINGLE(c) (((c)&0x80)==0)
 /**
  * Is this code unit (byte) a UTF-8 lead byte?
  * @param c 8-bit code unit (byte)
  * @return TRUE or FALSE
  * @stable ICU 2.4
  */
 #define CBU8_IS_LEAD(c) ((uint8)((c)-0xc0)<0x3e)
 /**
  * Is this code unit (byte) a UTF-8 trail byte?
  * @param c 8-bit code unit (byte)
  * @return TRUE or FALSE
  * @stable ICU 2.4
  */
 #define CBU8_IS_TRAIL(c) (((c)&0xc0)==0x80)
 /**
  * How many code units (bytes) are used for the UTF-8 encoding
  * of this Unicode code point?
  * @param c 32-bit code point
  * @return 1..4, or 0 if c is a surrogate or not a Unicode code point
  * @stable ICU 2.4
  */
 #define CBU8_LENGTH(c) \
     ((uint32)(c)<=0x7f ? 1 : \
         ((uint32)(c)<=0x7ff ? 2 : \
             ((uint32)(c)<=0xd7ff ? 3 : \
                 ((uint32)(c)<=0xdfff || (uint32)(c)>0x10ffff ? 0 : \
                     ((uint32)(c)<=0xffff ? 3 : 4)\
                 ) \
             ) \
         ) \
     )
 /**
  * The maximum number of UTF-8 code units (bytes) per Unicode code point (U+0000..U+10ffff).
  * @return 4
  * @stable ICU 2.4
  */
 #define CBU8_MAX_LENGTH 4
 /**
  * Function for handling "next code point" with error-checking.
  * @internal
  */
 UChar32 utf8_nextCharSafeBody(const uint8 *s, int32 *pi, int32 length, UChar32 c, UBool strict);
 /**
  * Get a code point from a string at a code point boundary offset,
  * and advance the offset to the next code point boundary.
  * (Post-incrementing forward iteration.)
  * "Safe" macro, checks for illegal sequences and for string boundaries.
  *
  * The offset may point to the lead byte of a multi-byte sequence,
  * in which case the macro will read the whole sequence.
  * If the offset points to a trail byte or an illegal UTF-8 sequence, then
  * c is set to a negative value.
  *
  * @param s const uint8 * string
  * @param i string offset, i<length
  * @param length string length
  * @param c output UChar32 variable, set to <0 in case of an error
  * @see CBU8_NEXT_UNSAFE
  * @stable ICU 2.4
  */
 #define CBU8_NEXT(s, i, length, c) { \
     (c)=(s)[(i)++]; \
     if(((uint8)(c))>=0x80) { \
         if(CBU8_IS_LEAD(c)) { \
             (c)=base_icu::utf8_nextCharSafeBody((const uint8 *)s, &(i), (int32)(length), c, -1); \
         } else { \
             (c)=CBU_SENTINEL; \
         } \
     } \
 }
 /**
  * Append a code point to a string, overwriting 1 to 4 bytes.
  * The offset points to the current end of the string contents
  * and is advanced (post-increment).
  * "Unsafe" macro, assumes a valid code point and sufficient space in the string.
  * Otherwise, the result is undefined.
  *
  * @param s const uint8 * string buffer
  * @param i string offset
  * @param c code point to append
  * @see CBU8_APPEND
  * @stable ICU 2.4
  */
 #define CBU8_APPEND_UNSAFE(s, i, c) { \
     if((uint32)(c)<=0x7f) { \
         (s)[(i)++]=(uint8)(c); \
     } else { \
         if((uint32)(c)<=0x7ff) { \
             (s)[(i)++]=(uint8)(((c)>>6)|0xc0); \
         } else { \
             if((uint32)(c)<=0xffff) { \
                 (s)[(i)++]=(uint8)(((c)>>12)|0xe0); \
             } else { \
                 (s)[(i)++]=(uint8)(((c)>>18)|0xf0); \
                 (s)[(i)++]=(uint8)((((c)>>12)&0x3f)|0x80); \
             } \
             (s)[(i)++]=(uint8)((((c)>>6)&0x3f)|0x80); \
         } \
         (s)[(i)++]=(uint8)(((c)&0x3f)|0x80); \
     } \
 }
 // UTF-16 macros ---------------------------------------------------------------
 // from utf16.h
 /**
  * Does this code unit alone encode a code point (BMP, not a surrogate)?
  * @param c 16-bit code unit
  * @return TRUE or FALSE
  * @stable ICU 2.4
  */
 #define CBU16_IS_SINGLE(c) !CBU_IS_SURROGATE(c)
 /**
  * Is this code unit a lead surrogate (U+d800..U+dbff)?
  * @param c 16-bit code unit
  * @return TRUE or FALSE
  * @stable ICU 2.4
  */
 #define CBU16_IS_LEAD(c) (((c)&0xfffffc00)==0xd800)
 /**
  * Is this code unit a trail surrogate (U+dc00..U+dfff)?
  * @param c 16-bit code unit
  * @return TRUE or FALSE
  * @stable ICU 2.4
  */
 #define CBU16_IS_TRAIL(c) (((c)&0xfffffc00)==0xdc00)
 /**
  * Is this code unit a surrogate (U+d800..U+dfff)?
  * @param c 16-bit code unit
  * @return TRUE or FALSE
  * @stable ICU 2.4
  */
 #define CBU16_IS_SURROGATE(c) CBU_IS_SURROGATE(c)
 /**
  * Assuming c is a surrogate code point (U16_IS_SURROGATE(c)),
  * is it a lead surrogate?
  * @param c 16-bit code unit
  * @return TRUE or FALSE
  * @stable ICU 2.4
  */
 #define CBU16_IS_SURROGATE_LEAD(c) (((c)&0x400)==0)
 /**
  * Helper constant for CBU16_GET_SUPPLEMENTARY.
  * @internal
  */
 #define CBU16_SURROGATE_OFFSET ((0xd800<<10UL)+0xdc00-0x10000)
 /**
  * Get a supplementary code point value (U+10000..U+10ffff)
  * from its lead and trail surrogates.
  * The result is undefined if the input values are not
  * lead and trail surrogates.
  *
  * @param lead lead surrogate (U+d800..U+dbff)
  * @param trail trail surrogate (U+dc00..U+dfff)
  * @return supplementary code point (U+10000..U+10ffff)
  * @stable ICU 2.4
  */
 #define CBU16_GET_SUPPLEMENTARY(lead, trail) \
     (((base_icu::UChar32)(lead)<<10UL)+(base_icu::UChar32)(trail)-CBU16_SURROGATE_OFFSET)
 /**
  * Get the lead surrogate (0xd800..0xdbff) for a
  * supplementary code point (0x10000..0x10ffff).
  * @param supplementary 32-bit code point (U+10000..U+10ffff)
  * @return lead surrogate (U+d800..U+dbff) for supplementary
  * @stable ICU 2.4
  */
 #define CBU16_LEAD(supplementary) (UChar)(((supplementary)>>10)+0xd7c0)
 /**
  * Get the trail surrogate (0xdc00..0xdfff) for a
  * supplementary code point (0x10000..0x10ffff).
  * @param supplementary 32-bit code point (U+10000..U+10ffff)
  * @return trail surrogate (U+dc00..U+dfff) for supplementary
  * @stable ICU 2.4
  */
 #define CBU16_TRAIL(supplementary) (UChar)(((supplementary)&0x3ff)|0xdc00)
 /**
  * How many 16-bit code units are used to encode this Unicode code point? (1 or 2)
  * The result is not defined if c is not a Unicode code point (U+0000..U+10ffff).
  * @param c 32-bit code point
  * @return 1 or 2
  * @stable ICU 2.4
  */
 #define CBU16_LENGTH(c) ((uint32)(c)<=0xffff ? 1 : 2)
 /**
  * The maximum number of 16-bit code units per Unicode code point (U+0000..U+10ffff).
  * @return 2
  * @stable ICU 2.4
  */
 #define CBU16_MAX_LENGTH 2
 /**
  * Get a code point from a string at a code point boundary offset,
  * and advance the offset to the next code point boundary.
  * (Post-incrementing forward iteration.)
  * "Safe" macro, handles unpaired surrogates and checks for string boundaries.
  *
  * The offset may point to the lead surrogate unit
  * for a supplementary code point, in which case the macro will read
  * the following trail surrogate as well.
  * If the offset points to a trail surrogate or
  * to a single, unpaired lead surrogate, then that itself
  * will be returned as the code point.
  *
  * @param s const UChar * string
  * @param i string offset, i<length
  * @param length string length
  * @param c output UChar32 variable
  * @stable ICU 2.4
  */
 #define CBU16_NEXT(s, i, length, c) { \
     (c)=(s)[(i)++]; \
     if(CBU16_IS_LEAD(c)) { \
         uint16 __c2; \
         if((i)<(length) && CBU16_IS_TRAIL(__c2=(s)[(i)])) { \
             ++(i); \
             (c)=CBU16_GET_SUPPLEMENTARY((c), __c2); \
         } \
     } \
 }
 /**
  * Append a code point to a string, overwriting 1 or 2 code units.
  * The offset points to the current end of the string contents
  * and is advanced (post-increment).
  * "Unsafe" macro, assumes a valid code point and sufficient space in the string.
  * Otherwise, the result is undefined.
  *
  * @param s const UChar * string buffer
  * @param i string offset
  * @param c code point to append
  * @see CBU16_APPEND
  * @stable ICU 2.4
  */
 #define CBU16_APPEND_UNSAFE(s, i, c) { \
     if((uint32)(c)<=0xffff) { \
         (s)[(i)++]=(uint16)(c); \
     } else { \
         (s)[(i)++]=(uint16)(((c)>>10)+0xd7c0); \
         (s)[(i)++]=(uint16)(((c)&0x3ff)|0xdc00); \
     } \
 }
 }  // namesapce base_icu
 #endif  // BASE_THIRD_PARTY_ICU_ICU_UTF_H_

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security/sandbox/chromium/base/third_party/icu/icu_utf.h@141e0f1194b1 (annotated)

security/sandbox/chromium/base/third_party/icu/icu_utf.h