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76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
/* -*- C++ -*- */
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// $Id: UTF16_Encoding_Converter.inl 80826 2008-03-04 14:51:23Z wotte $
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// ======================================================================
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//
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// The actual conversion methods are covered by the copyright information
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// below.
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// Chad Elliott 4/28/2005
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//
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// Copyright 2001-2004 Unicode, Inc.
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//
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// Limitations on Rights to Redistribute This Code
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//
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// Unicode, Inc. hereby grants the right to freely use the information
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// supplied in this file in the creation of products supporting the
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// Unicode Standard, and to make copies of this file in any form
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// for internal or external distribution as long as this notice
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// remains attached.
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//
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// ======================================================================
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ACE_BEGIN_VERSIONED_NAMESPACE_DECL
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ACE_INLINE bool
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ACE_UTF16_Encoding_Converter::is_legal_utf8 (const ACE_Byte* source,
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size_t length) const
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{
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ACE_Byte a;
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const ACE_Byte* srcptr = source + length;
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switch (length)
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{
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default:
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return false;
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// Everything else falls through when "true"...
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case 4: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
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case 3: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
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case 2: if ((a = (*--srcptr)) > 0xBF) return false;
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switch (*source)
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{
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// no fall-through in this inner switch
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case 0xE0:
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if (a < 0xA0)
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return false;
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break;
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case 0xED:
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if (a > 0x9F)
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return false;
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break;
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case 0xF0:
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if (a < 0x90)
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return false;
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break;
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case 0xF4:
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if (a > 0x8F)
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return false;
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break;
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default:
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if (a < 0x80)
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return false;
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}
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case 1:
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if (*source >= 0x80 && *source < 0xC2)
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return false;
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}
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if (*source > 0xF4)
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return false;
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return true;
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}
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ACE_END_VERSIONED_NAMESPACE_DECL
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