mirror of https://github.com/acidanthera/audk.git
290 lines
10 KiB
C
290 lines
10 KiB
C
/** @file
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This module provide help function for displaying unicode string.
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Copyright (c) 2006 - 2008, Intel Corporation<BR>
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "UefiLibInternal.h"
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typedef struct {
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CHAR16 WChar;
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UINT32 Width;
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} UNICODE_WIDTH_ENTRY;
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GLOBAL_REMOVE_IF_UNREFERENCED CONST UNICODE_WIDTH_ENTRY mUnicodeWidthTable[] = {
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//
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// General script area
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//
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{(CHAR16)0x1FFF, 1},
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/*
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* Merge the blocks and replace them with the above entry as they fall to
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* the same category and they are all narrow glyph. This will reduce search
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* time and table size. The merge will omit the reserved code.
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*
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* Remove the above item if below is un-commented.
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*
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{(CHAR16)0x007F, 1}, // C0 controls and basic Latin. 0x0000-0x007F
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{(CHAR16)0x00FF, 1}, // C1 controls and Latin-1 support. 0x0080-0x00FF
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{(CHAR16)0x017F, 1}, // Latin extended-A. 0x0100-0x017F
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{(CHAR16)0x024F, 1}, // Latin extended-B. 0x0180-0x024F
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{(CHAR16)0x02AF, 1}, // IPA extensions. 0x0250-0x02AF
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{(CHAR16)0x02FF, 1}, // Spacing modifier letters. 0x02B0-0x02FF
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{(CHAR16)0x036F, 1}, // Combining diacritical marks. 0x0300-0x036F
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{(CHAR16)0x03FF, 1}, // Greek. 0x0370-0x03FF
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{(CHAR16)0x04FF, 1}, // Cyrillic. 0x0400-0x04FF
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{(CHAR16)0x052F, 0}, // Unassigned. As Armenian in ver3.0. 0x0500-0x052F
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{(CHAR16)0x058F, 1}, // Armenian. 0x0530-0x058F
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{(CHAR16)0x05FF, 1}, // Hebrew. 0x0590-0x05FF
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{(CHAR16)0x06FF, 1}, // Arabic. 0x0600-0x06FF
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{(CHAR16)0x08FF, 0}, // Unassigned. 0x0700-0x08FF
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{(CHAR16)0x097F, 1}, // Devanagari. 0x0900-0x097F
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{(CHAR16)0x09FF, 1}, // Bengali. 0x0980-0x09FF
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{(CHAR16)0x0A7F, 1}, // Gurmukhi. 0x0A00-0x0A7F
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{(CHAR16)0x0AFF, 1}, // Gujarati. 0x0A80-0x0AFF
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{(CHAR16)0x0B7F, 1}, // Oriya. 0x0B00-0x0B7F
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{(CHAR16)0x0BFF, 1}, // Tamil. (See page 7-92). 0x0B80-0x0BFF
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{(CHAR16)0x0C7F, 1}, // Telugu. 0x0C00-0x0C7F
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{(CHAR16)0x0CFF, 1}, // Kannada. (See page 7-100). 0x0C80-0x0CFF
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{(CHAR16)0x0D7F, 1}, // Malayalam (See page 7-104). 0x0D00-0x0D7F
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{(CHAR16)0x0DFF, 0}, // Unassigned. 0x0D80-0x0DFF
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{(CHAR16)0x0E7F, 1}, // Thai. 0x0E00-0x0E7F
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{(CHAR16)0x0EFF, 1}, // Lao. 0x0E80-0x0EFF
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{(CHAR16)0x0FBF, 1}, // Tibetan. 0x0F00-0x0FBF
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{(CHAR16)0x109F, 0}, // Unassigned. 0x0FC0-0x109F
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{(CHAR16)0x10FF, 1}, // Georgian. 0x10A0-0x10FF
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{(CHAR16)0x11FF, 1}, // Hangul Jamo. 0x1100-0x11FF
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{(CHAR16)0x1DFF, 0}, // Unassigned. 0x1200-0x1DFF
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{(CHAR16)0x1EFF, 1}, // Latin extended additional. 0x1E00-0x1EFF
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{(CHAR16)0x1FFF, 1}, // Greek extended. 0x1F00-0x1FFF
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*
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*/
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//
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// Symbol area
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//
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{(CHAR16)0x2FFF, 1},
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/*
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* Merge the blocks and replace them with the above entry as they fall to
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* the same category and they are all narrow glyph. This will reduce search
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* time and table size. The merge will omit the reserved code.
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*
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* Remove the above item if below is un-commented.
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*
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{(CHAR16)0x206F, 1}, // General punctuation. (See page7-154). 0x200-0x206F
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{(CHAR16)0x209F, 1}, // Superscripts and subscripts. 0x2070-0x209F
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{(CHAR16)0x20CF, 1}, // Currency symbols. 0x20A0-0x20CF
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{(CHAR16)0x20FF, 1}, // Combining diacritical marks for symbols. 0x20D0-0x20FF
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{(CHAR16)0x214F, 1}, // Letterlike sympbols. 0x2100-0x214F
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{(CHAR16)0x218F, 1}, // Number forms. 0x2150-0x218F
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{(CHAR16)0x21FF, 1}, // Arrows. 0x2190-0x21FF
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{(CHAR16)0x22FF, 1}, // Mathematical operators. 0x2200-0x22FF
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{(CHAR16)0x23FF, 1}, // Miscellaneous technical. 0x2300-0x23FF
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{(CHAR16)0x243F, 1}, // Control pictures. 0x2400-0x243F
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{(CHAR16)0x245F, 1}, // Optical character recognition. 0x2440-0x245F
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{(CHAR16)0x24FF, 1}, // Enclosed alphanumerics. 0x2460-0x24FF
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{(CHAR16)0x257F, 1}, // Box drawing. 0x2500-0x257F
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{(CHAR16)0x259F, 1}, // Block elements. 0x2580-0x259F
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{(CHAR16)0x25FF, 1}, // Geometric shapes. 0x25A0-0x25FF
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{(CHAR16)0x26FF, 1}, // Miscellaneous symbols. 0x2600-0x26FF
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{(CHAR16)0x27BF, 1}, // Dingbats. 0x2700-0x27BF
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{(CHAR16)0x2FFF, 0}, // Reserved. 0x27C0-0x2FFF
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*
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*/
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//
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// CJK phonetics and symbol area
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//
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{(CHAR16)0x33FF, 2},
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/*
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* Merge the blocks and replace them with the above entry as they fall to
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* the same category and they are all wide glyph. This will reduce search
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* time and table size. The merge will omit the reserved code.
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*
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* Remove the above item if below is un-commented.
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*
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{(CHAR16)0x303F, 2}, // CJK symbols and punctuation. 0x3000-0x303F
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{(CHAR16)0x309F, 2}, // Hiragana. 0x3040-0x309F
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{(CHAR16)0x30FF, 2}, // Katakana. 0x30A0-0x30FF
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{(CHAR16)0x312F, 2}, // Bopomofo. 0x3100-0x312F
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{(CHAR16)0x318F, 2}, // Hangul compatibility jamo. 0x3130-0x318F
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{(CHAR16)0x319F, 2}, // Kanbun. 0x3190-0x319F
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{(CHAR16)0x31FF, 0}, // Reserved. As Bopomofo extended in ver3.0. 0x31A0-0x31FF
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{(CHAR16)0x32FF, 2}, // Enclosed CJK letters and months. 0x3200-0x32FF
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{(CHAR16)0x33FF, 2}, // CJK compatibility. 0x3300-0x33FF
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*
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*/
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//
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// CJK ideograph area
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//
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{(CHAR16)0x9FFF, 2},
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/*
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* Merge the blocks and replace them with the above entry as they fall to
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* the same category and they are all wide glyph. This will reduce search
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* time and table size. The merge will omit the reserved code.
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*
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* Remove the above item if below is un-commented.
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*
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{(CHAR16)0x4DFF, 0}, // Reserved. 0x3400-0x4DBF as CJK unified ideographs
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// extension A in ver3.0. 0x3400-0x4DFF
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{(CHAR16)0x9FFF, 2}, // CJK unified ideographs. 0x4E00-0x9FFF
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*
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*/
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//
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// Reserved
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//
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{(CHAR16)0xABFF, 0}, // Reserved. 0xA000-0xA490 as Yi syllables. 0xA490-0xA4D0
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// as Yi radicals in ver3.0. 0xA000-0xABFF
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//
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// Hangul syllables
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//
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{(CHAR16)0xD7FF, 2},
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/*
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* Merge the blocks and replace them with the above entry as they fall to
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* the same category and they are all wide glyph. This will reduce search
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* time and table size. The merge will omit the reserved code.
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*
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* Remove the above item if below is un-commented.
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*
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{(CHAR16)0xD7A3, 2}, // Hangul syllables. 0xAC00-0xD7A3
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{(CHAR16)0xD7FF, 0}, // Reserved. 0xD7A3-0xD7FF
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*
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*/
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//
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// Surrogates area
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//
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{(CHAR16)0xDFFF, 0}, // Surrogates, not used now. 0xD800-0xDFFF
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//
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// Private use area
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//
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{(CHAR16)0xF8FF, 0}, // Private use area. 0xE000-0xF8FF
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//
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// Compatibility area and specials
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//
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{(CHAR16)0xFAFF, 2}, // CJK compatibility ideographs. 0xF900-0xFAFF
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{(CHAR16)0xFB4F, 1}, // Alphabetic presentation forms. 0xFB00-0xFB4F
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{(CHAR16)0xFDFF, 1}, // Arabic presentation forms-A. 0xFB50-0xFDFF
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{(CHAR16)0xFE1F, 0}, // Reserved. As variation selectors in ver3.0. 0xFE00-0xFE1F
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{(CHAR16)0xFE2F, 1}, // Combining half marks. 0xFE20-0xFE2F
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{(CHAR16)0xFE4F, 2}, // CJK compatibility forms. 0xFE30-0xFE4F
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{(CHAR16)0xFE6F, 1}, // Small Form Variants. 0xFE50-0xFE6F
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{(CHAR16)0xFEFF, 1}, // Arabic presentation forms-B. 0xFE70-0xFEFF
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{(CHAR16)0xFFEF, 1}, // Half width and full width forms. 0xFF00-0xFFEF
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{(CHAR16)0xFFFF, 0}, // Speicials. 0xFFF0-0xFFFF
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};
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/**
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Retrieves the width of a Unicode character.
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This function computes and returns the width of the Unicode character specified
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by UnicodeChar.
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@param UnicodeChar A Unicode character.
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@retval 0 The width if UnicodeChar could not be determined.
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@retval 1 UnicodeChar is a narrow glyph.
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@retval 2 UnicodeChar is a wide glyph.
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**/
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UINTN
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EFIAPI
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GetGlyphWidth (
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IN CHAR16 UnicodeChar
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)
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{
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UINTN Index;
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UINTN Low;
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UINTN High;
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CONST UNICODE_WIDTH_ENTRY *Item;
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Item = NULL;
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Low = 0;
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High = (sizeof (mUnicodeWidthTable)) / (sizeof (UNICODE_WIDTH_ENTRY)) - 1;
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while (Low <= High) {
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Index = (Low + High) >> 1;
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Item = &(mUnicodeWidthTable[Index]);
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if (Index == 0) {
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if (UnicodeChar <= Item->WChar) {
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break;
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}
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return 0;
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}
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if (UnicodeChar > Item->WChar) {
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Low = Index + 1;
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} else if (UnicodeChar <= mUnicodeWidthTable[Index - 1].WChar) {
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High = Index - 1;
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} else {
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//
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// Index - 1 < UnicodeChar <= Index. Found
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//
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break;
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}
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}
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if (Low <= High) {
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return Item->Width;
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}
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return 0;
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}
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/**
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Computes the display length of a Null-terminated Unicode String.
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This function computes and returns the display length of the Null-terminated Unicode
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string specified by String. If String is NULL then 0 is returned. If any of the widths
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of the Unicode characters in String can not be determined, then 0 is returned. The display
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width of String can be computed by summing the display widths of each Unicode character
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in String. Unicode characters that are narrow glyphs have a width of 1, and Unicode
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characters that are width glyphs have a width of 2.
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If String is not aligned on a 16-bit boundary, then ASSERT().
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@param String A pointer to a Null-terminated Unicode string.
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@return The display length of the Null-terminated Unicode string specified by String.
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**/
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UINTN
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EFIAPI
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UnicodeStringDisplayLength (
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IN CONST CHAR16 *String
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)
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{
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UINTN Length;
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UINTN Width;
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if (String == NULL) {
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return 0;
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}
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Length = 0;
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while (*String != 0) {
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Width = GetGlyphWidth (*String);
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if (Width == 0) {
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return 0;
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}
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Length += Width;
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String++;
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}
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return Length;
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}
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