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Table 610 Simple strings and their corresponding code point values in various encodings Character String
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Code Point (Hexadecimal) 73 65 63 75 72 69 74 79 73 65 63 75 72 69 74 79 0073 0065 0063 0075 0072 0069 0074 0079 73 65 63 75 72 69 74 FF 73 65 63 75 72 69 74 C3 BF 0073 0065 0063 0075 0072 0069 0074 00FF (none) E5 AE 89 E5 85 A8 5B89 5168
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In C and C++, data types are more independent from speci c characterencoding forms, which the speci cation leaves at the discretion of the implementation [ISO C99, 2005] The char data type can be used to store single-byte characters, where one char holds the representation of a single printable character or to represent variable-width multibyte character strings, where a variable number of char elements represents each printable character Because the char data type is not suitable to represent the 16-bit characters used in UTF-16 and other common encodings, the C90 standard was revised to include the new wchar_t data type, which, by de nition, is required only to be capable of representing the basic character set but, in practice, is de ned to be 16 bits on Windows and some UNIX platforms, and 32 bits on GNU Linux platforms [FSF, 2001] The WCHAR data type is a Windows-speci c equivalent de ned to be synonymous with wchar_t To further complicate things, strings in C and C++ are referred to by different names depending on the type of characters they hold The term multibyte string typically refers to a string consisting of char elements in which sequences of one or more of the elements correspond to single printable characters Likewise, the term wide character string refers to a similar string
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2 The word security in simplified Chinese, translation courtesy of Michelle Xue and Helen Leng
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consisting of wchar_t elements This distinction is somewhat muddled in Windows environments, where Unicode is often used incorrectly to refer to UTF-16 encoded strings It is not uncommon for discussions of string handling to include only references to multibyte and Unicode strings, with no mention of any speci c character encoding As with other common points of confusion in C, buffer over ow vulnerabilities are often the result Characters and Buffer Over ow Vulnerabilities Most buffer over ow errors speci cally related to character-encoding issues occur because of a mismatch between size in bytes of a character and the units used to bound operations on a string composed of those characters If characters can span multiple bytes, the difference between the number of bytes in a string and the number of characters in a string can be signi cant When an operation that expects its bound in bytes is passed a bound in characters, it can severely truncate the data on which it operates In the opposite direction, when a function that expects its bound in characters is passed a bound in bytes, it can result in a buffer over ow that writes well beyond the allocated bounds of memory The risk of errors related to bounds specified in the wrong units is magnified in the case of functions that convert between one encoding and another Some of these functions accept two bounds, one in bytes and one in characters Refer to Table 611 for a summary of the functions Windows provides to convert between multibyte character strings (usually US-ASCII) and wide character (Unicode in the Windows world) strings3 Notice that the bounds passed to these functions are specified in different units one in bytes, the other in characters making them prone to buffer overflows Even when only a bound on data written to the destination is accepted, confusion over whether the units correspond to the data type of the source or the destination can lead to errors Table 612 summarizes the functions found on Linux and UNIX platforms to support conversion between multibyte and wide character strings
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3 The deprecated UnicodeToBytes() and BytesToUnicode() functions should be avoided entirely because they present an unintuitive interface and frequently lead to buffer over ow vulnerabilities
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