/*
 * code page 437 to unicode map
 */

#include "types.h"
#include "biosvar.h"
#include "cp437.h"

static VAR16 u16 cp437_to_unicode_map[256] = {

    /* https://en.wikipedia.org/wiki/Code_page_437 */
    [ 0x00 ] = 0x0000,
    [ 0x01 ] = 0x263A,
    [ 0x02 ] = 0x263B,
    [ 0x03 ] = 0x2665,
    [ 0x04 ] = 0x2666,
    [ 0x05 ] = 0x2663,
    [ 0x06 ] = 0x2660,
    [ 0x07 ] = 0x2022,
    [ 0x08 ] = 0x25D8,
    [ 0x09 ] = 0x25CB,
    [ 0x0a ] = 0x25D9,
    [ 0x0b ] = 0x2642,
    [ 0x0c ] = 0x2640,
    [ 0x0d ] = 0x266A,
    [ 0x0e ] = 0x266B,
    [ 0x0f ] = 0x263C,
    [ 0x10 ] = 0x25BA,
    [ 0x11 ] = 0x25C4,
    [ 0x12 ] = 0x2195,
    [ 0x13 ] = 0x203C,
    [ 0x14 ] = 0x00B6,
    [ 0x15 ] = 0x00A7,
    [ 0x16 ] = 0x25AC,
    [ 0x17 ] = 0x21A8,
    [ 0x18 ] = 0x2191,
    [ 0x19 ] = 0x2193,
    [ 0x1a ] = 0x2192,
    [ 0x1b ] = 0x2190,
    [ 0x1c ] = 0x221F,
    [ 0x1d ] = 0x2194,
    [ 0x1e ] = 0x25B2,
    [ 0x1f ] = 0x25BC,
    [ 0x7f ] = 0x2302,

    /* http://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/PC/CP437.TXT */
    [ 0x20 ] = 0x0020, //  SPACE
    [ 0x21 ] = 0x0021, //  EXCLAMATION MARK
    [ 0x22 ] = 0x0022, //  QUOTATION MARK
    [ 0x23 ] = 0x0023, //  NUMBER SIGN
    [ 0x24 ] = 0x0024, //  DOLLAR SIGN
    [ 0x25 ] = 0x0025, //  PERCENT SIGN
    [ 0x26 ] = 0x0026, //  AMPERSAND
    [ 0x27 ] = 0x0027, //  APOSTROPHE
    [ 0x28 ] = 0x0028, //  LEFT PARENTHESIS
    [ 0x29 ] = 0x0029, //  RIGHT PARENTHESIS
    [ 0x2a ] = 0x002a, //  ASTERISK
    [ 0x2b ] = 0x002b, //  PLUS SIGN
    [ 0x2c ] = 0x002c, //  COMMA
    [ 0x2d ] = 0x002d, //  HYPHEN-MINUS
    [ 0x2e ] = 0x002e, //  FULL STOP
    [ 0x2f ] = 0x002f, //  SOLIDUS
    [ 0x30 ] = 0x0030, //  DIGIT ZERO
    [ 0x31 ] = 0x0031, //  DIGIT ONE
    [ 0x32 ] = 0x0032, //  DIGIT TWO
    [ 0x33 ] = 0x0033, //  DIGIT THREE
    [ 0x34 ] = 0x0034, //  DIGIT FOUR
    [ 0x35 ] = 0x0035, //  DIGIT FIVE
    [ 0x36 ] = 0x0036, //  DIGIT SIX
    [ 0x37 ] = 0x0037, //  DIGIT SEVEN
    [ 0x38 ] = 0x0038, //  DIGIT EIGHT
    [ 0x39 ] = 0x0039, //  DIGIT NINE
    [ 0x3a ] = 0x003a, //  COLON
    [ 0x3b ] = 0x003b, //  SEMICOLON
    [ 0x3c ] = 0x003c, //  LESS-THAN SIGN
    [ 0x3d ] = 0x003d, //  EQUALS SIGN
    [ 0x3e ] = 0x003e, //  GREATER-THAN SIGN
    [ 0x3f ] = 0x003f, //  QUESTION MARK
    [ 0x40 ] = 0x0040, //  COMMERCIAL AT
    [ 0x41 ] = 0x0041, //  LATIN CAPITAL LETTER A
    [ 0x42 ] = 0x0042, //  LATIN CAPITAL LETTER B
    [ 0x43 ] = 0x0043, //  LATIN CAPITAL LETTER C
    [ 0x44 ] = 0x0044, //  LATIN CAPITAL LETTER D
    [ 0x45 ] = 0x0045, //  LATIN CAPITAL LETTER E
    [ 0x46 ] = 0x0046, //  LATIN CAPITAL LETTER F
    [ 0x47 ] = 0x0047, //  LATIN CAPITAL LETTER G
    [ 0x48 ] = 0x0048, //  LATIN CAPITAL LETTER H
    [ 0x49 ] = 0x0049, //  LATIN CAPITAL LETTER I
    [ 0x4a ] = 0x004a, //  LATIN CAPITAL LETTER J
    [ 0x4b ] = 0x004b, //  LATIN CAPITAL LETTER K
    [ 0x4c ] = 0x004c, //  LATIN CAPITAL LETTER L
    [ 0x4d ] = 0x004d, //  LATIN CAPITAL LETTER M
    [ 0x4e ] = 0x004e, //  LATIN CAPITAL LETTER N
    [ 0x4f ] = 0x004f, //  LATIN CAPITAL LETTER O
    [ 0x50 ] = 0x0050, //  LATIN CAPITAL LETTER P
    [ 0x51 ] = 0x0051, //  LATIN CAPITAL LETTER Q
    [ 0x52 ] = 0x0052, //  LATIN CAPITAL LETTER R
    [ 0x53 ] = 0x0053, //  LATIN CAPITAL LETTER S
    [ 0x54 ] = 0x0054, //  LATIN CAPITAL LETTER T
    [ 0x55 ] = 0x0055, //  LATIN CAPITAL LETTER U
    [ 0x56 ] = 0x0056, //  LATIN CAPITAL LETTER V
    [ 0x57 ] = 0x0057, //  LATIN CAPITAL LETTER W
    [ 0x58 ] = 0x0058, //  LATIN CAPITAL LETTER X
    [ 0x59 ] = 0x0059, //  LATIN CAPITAL LETTER Y
    [ 0x5a ] = 0x005a, //  LATIN CAPITAL LETTER Z
    [ 0x5b ] = 0x005b, //  LEFT SQUARE BRACKET
    [ 0x5c ] = 0x005c, //  REVERSE SOLIDUS
    [ 0x5d ] = 0x005d, //  RIGHT SQUARE BRACKET
    [ 0x5e ] = 0x005e, //  CIRCUMFLEX ACCENT
    [ 0x5f ] = 0x005f, //  LOW LINE
    [ 0x60 ] = 0x0060, //  GRAVE ACCENT
    [ 0x61 ] = 0x0061, //  LATIN SMALL LETTER A
    [ 0x62 ] = 0x0062, //  LATIN SMALL LETTER B
    [ 0x63 ] = 0x0063, //  LATIN SMALL LETTER C
    [ 0x64 ] = 0x0064, //  LATIN SMALL LETTER D
    [ 0x65 ] = 0x0065, //  LATIN SMALL LETTER E
    [ 0x66 ] = 0x0066, //  LATIN SMALL LETTER F
    [ 0x67 ] = 0x0067, //  LATIN SMALL LETTER G
    [ 0x68 ] = 0x0068, //  LATIN SMALL LETTER H
    [ 0x69 ] = 0x0069, //  LATIN SMALL LETTER I
    [ 0x6a ] = 0x006a, //  LATIN SMALL LETTER J
    [ 0x6b ] = 0x006b, //  LATIN SMALL LETTER K
    [ 0x6c ] = 0x006c, //  LATIN SMALL LETTER L
    [ 0x6d ] = 0x006d, //  LATIN SMALL LETTER M
    [ 0x6e ] = 0x006e, //  LATIN SMALL LETTER N
    [ 0x6f ] = 0x006f, //  LATIN SMALL LETTER O
    [ 0x70 ] = 0x0070, //  LATIN SMALL LETTER P
    [ 0x71 ] = 0x0071, //  LATIN SMALL LETTER Q
    [ 0x72 ] = 0x0072, //  LATIN SMALL LETTER R
    [ 0x73 ] = 0x0073, //  LATIN SMALL LETTER S
    [ 0x74 ] = 0x0074, //  LATIN SMALL LETTER T
    [ 0x75 ] = 0x0075, //  LATIN SMALL LETTER U
    [ 0x76 ] = 0x0076, //  LATIN SMALL LETTER V
    [ 0x77 ] = 0x0077, //  LATIN SMALL LETTER W
    [ 0x78 ] = 0x0078, //  LATIN SMALL LETTER X
    [ 0x79 ] = 0x0079, //  LATIN SMALL LETTER Y
    [ 0x7a ] = 0x007a, //  LATIN SMALL LETTER Z
    [ 0x7b ] = 0x007b, //  LEFT CURLY BRACKET
    [ 0x7c ] = 0x007c, //  VERTICAL LINE
    [ 0x7d ] = 0x007d, //  RIGHT CURLY BRACKET
    [ 0x7e ] = 0x007e, //  TILDE
    [ 0x80 ] = 0x00c7, //  LATIN CAPITAL LETTER C WITH CEDILLA
    [ 0x81 ] = 0x00fc, //  LATIN SMALL LETTER U WITH DIAERESIS
    [ 0x82 ] = 0x00e9, //  LATIN SMALL LETTER E WITH ACUTE
    [ 0x83 ] = 0x00e2, //  LATIN SMALL LETTER A WITH CIRCUMFLEX
    [ 0x84 ] = 0x00e4, //  LATIN SMALL LETTER A WITH DIAERESIS
    [ 0x85 ] = 0x00e0, //  LATIN SMALL LETTER A WITH GRAVE
    [ 0x86 ] = 0x00e5, //  LATIN SMALL LETTER A WITH RING ABOVE
    [ 0x87 ] = 0x00e7, //  LATIN SMALL LETTER C WITH CEDILLA
    [ 0x88 ] = 0x00ea, //  LATIN SMALL LETTER E WITH CIRCUMFLEX
    [ 0x89 ] = 0x00eb, //  LATIN SMALL LETTER E WITH DIAERESIS
    [ 0x8a ] = 0x00e8, //  LATIN SMALL LETTER E WITH GRAVE
    [ 0x8b ] = 0x00ef, //  LATIN SMALL LETTER I WITH DIAERESIS
    [ 0x8c ] = 0x00ee, //  LATIN SMALL LETTER I WITH CIRCUMFLEX
    [ 0x8d ] = 0x00ec, //  LATIN SMALL LETTER I WITH GRAVE
    [ 0x8e ] = 0x00c4, //  LATIN CAPITAL LETTER A WITH DIAERESIS
    [ 0x8f ] = 0x00c5, //  LATIN CAPITAL LETTER A WITH RING ABOVE
    [ 0x90 ] = 0x00c9, //  LATIN CAPITAL LETTER E WITH ACUTE
    [ 0x91 ] = 0x00e6, //  LATIN SMALL LIGATURE AE
    [ 0x92 ] = 0x00c6, //  LATIN CAPITAL LIGATURE AE
    [ 0x93 ] = 0x00f4, //  LATIN SMALL LETTER O WITH CIRCUMFLEX
    [ 0x94 ] = 0x00f6, //  LATIN SMALL LETTER O WITH DIAERESIS
    [ 0x95 ] = 0x00f2, //  LATIN SMALL LETTER O WITH GRAVE
    [ 0x96 ] = 0x00fb, //  LATIN SMALL LETTER U WITH CIRCUMFLEX
    [ 0x97 ] = 0x00f9, //  LATIN SMALL LETTER U WITH GRAVE
    [ 0x98 ] = 0x00ff, //  LATIN SMALL LETTER Y WITH DIAERESIS
    [ 0x99 ] = 0x00d6, //  LATIN CAPITAL LETTER O WITH DIAERESIS
    [ 0x9a ] = 0x00dc, //  LATIN CAPITAL LETTER U WITH DIAERESIS
    [ 0x9b ] = 0x00a2, //  CENT SIGN
    [ 0x9c ] = 0x00a3, //  POUND SIGN
    [ 0x9d ] = 0x00a5, //  YEN SIGN
    [ 0x9e ] = 0x20a7, //  PESETA SIGN
    [ 0x9f ] = 0x0192, //  LATIN SMALL LETTER F WITH HOOK
    [ 0xa0 ] = 0x00e1, //  LATIN SMALL LETTER A WITH ACUTE
    [ 0xa1 ] = 0x00ed, //  LATIN SMALL LETTER I WITH ACUTE
    [ 0xa2 ] = 0x00f3, //  LATIN SMALL LETTER O WITH ACUTE
    [ 0xa3 ] = 0x00fa, //  LATIN SMALL LETTER U WITH ACUTE
    [ 0xa4 ] = 0x00f1, //  LATIN SMALL LETTER N WITH TILDE
    [ 0xa5 ] = 0x00d1, //  LATIN CAPITAL LETTER N WITH TILDE
    [ 0xa6 ] = 0x00aa, //  FEMININE ORDINAL INDICATOR
    [ 0xa7 ] = 0x00ba, //  MASCULINE ORDINAL INDICATOR
    [ 0xa8 ] = 0x00bf, //  INVERTED QUESTION MARK
    [ 0xa9 ] = 0x2310, //  REVERSED NOT SIGN
    [ 0xaa ] = 0x00ac, //  NOT SIGN
    [ 0xab ] = 0x00bd, //  VULGAR FRACTION ONE HALF
    [ 0xac ] = 0x00bc, //  VULGAR FRACTION ONE QUARTER
    [ 0xad ] = 0x00a1, //  INVERTED EXCLAMATION MARK
    [ 0xae ] = 0x00ab, //  LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
    [ 0xaf ] = 0x00bb, //  RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
    [ 0xb0 ] = 0x2591, //  LIGHT SHADE
    [ 0xb1 ] = 0x2592, //  MEDIUM SHADE
    [ 0xb2 ] = 0x2593, //  DARK SHADE
    [ 0xb3 ] = 0x2502, //  BOX DRAWINGS LIGHT VERTICAL
    [ 0xb4 ] = 0x2524, //  BOX DRAWINGS LIGHT VERTICAL AND LEFT
    [ 0xb5 ] = 0x2561, //  BOX DRAWINGS VERTICAL SINGLE AND LEFT DOUBLE
    [ 0xb6 ] = 0x2562, //  BOX DRAWINGS VERTICAL DOUBLE AND LEFT SINGLE
    [ 0xb7 ] = 0x2556, //  BOX DRAWINGS DOWN DOUBLE AND LEFT SINGLE
    [ 0xb8 ] = 0x2555, //  BOX DRAWINGS DOWN SINGLE AND LEFT DOUBLE
    [ 0xb9 ] = 0x2563, //  BOX DRAWINGS DOUBLE VERTICAL AND LEFT
    [ 0xba ] = 0x2551, //  BOX DRAWINGS DOUBLE VERTICAL
    [ 0xbb ] = 0x2557, //  BOX DRAWINGS DOUBLE DOWN AND LEFT
    [ 0xbc ] = 0x255d, //  BOX DRAWINGS DOUBLE UP AND LEFT
    [ 0xbd ] = 0x255c, //  BOX DRAWINGS UP DOUBLE AND LEFT SINGLE
    [ 0xbe ] = 0x255b, //  BOX DRAWINGS UP SINGLE AND LEFT DOUBLE
    [ 0xbf ] = 0x2510, //  BOX DRAWINGS LIGHT DOWN AND LEFT
    [ 0xc0 ] = 0x2514, //  BOX DRAWINGS LIGHT UP AND RIGHT
    [ 0xc1 ] = 0x2534, //  BOX DRAWINGS LIGHT UP AND HORIZONTAL
    [ 0xc2 ] = 0x252c, //  BOX DRAWINGS LIGHT DOWN AND HORIZONTAL
    [ 0xc3 ] = 0x251c, //  BOX DRAWINGS LIGHT VERTICAL AND RIGHT
    [ 0xc4 ] = 0x2500, //  BOX DRAWINGS LIGHT HORIZONTAL
    [ 0xc5 ] = 0x253c, //  BOX DRAWINGS LIGHT VERTICAL AND HORIZONTAL
    [ 0xc6 ] = 0x255e, //  BOX DRAWINGS VERTICAL SINGLE AND RIGHT DOUBLE
    [ 0xc7 ] = 0x255f, //  BOX DRAWINGS VERTICAL DOUBLE AND RIGHT SINGLE
    [ 0xc8 ] = 0x255a, //  BOX DRAWINGS DOUBLE UP AND RIGHT
    [ 0xc9 ] = 0x2554, //  BOX DRAWINGS DOUBLE DOWN AND RIGHT
    [ 0xca ] = 0x2569, //  BOX DRAWINGS DOUBLE UP AND HORIZONTAL
    [ 0xcb ] = 0x2566, //  BOX DRAWINGS DOUBLE DOWN AND HORIZONTAL
    [ 0xcc ] = 0x2560, //  BOX DRAWINGS DOUBLE VERTICAL AND RIGHT
    [ 0xcd ] = 0x2550, //  BOX DRAWINGS DOUBLE HORIZONTAL
    [ 0xce ] = 0x256c, //  BOX DRAWINGS DOUBLE VERTICAL AND HORIZONTAL
    [ 0xcf ] = 0x2567, //  BOX DRAWINGS UP SINGLE AND HORIZONTAL DOUBLE
    [ 0xd0 ] = 0x2568, //  BOX DRAWINGS UP DOUBLE AND HORIZONTAL SINGLE
    [ 0xd1 ] = 0x2564, //  BOX DRAWINGS DOWN SINGLE AND HORIZONTAL DOUBLE
    [ 0xd2 ] = 0x2565, //  BOX DRAWINGS DOWN DOUBLE AND HORIZONTAL SINGLE
    [ 0xd3 ] = 0x2559, //  BOX DRAWINGS UP DOUBLE AND RIGHT SINGLE
    [ 0xd4 ] = 0x2558, //  BOX DRAWINGS UP SINGLE AND RIGHT DOUBLE
    [ 0xd5 ] = 0x2552, //  BOX DRAWINGS DOWN SINGLE AND RIGHT DOUBLE
    [ 0xd6 ] = 0x2553, //  BOX DRAWINGS DOWN DOUBLE AND RIGHT SINGLE
    [ 0xd7 ] = 0x256b, //  BOX DRAWINGS VERTICAL DOUBLE AND HORIZONTAL SINGLE
    [ 0xd8 ] = 0x256a, //  BOX DRAWINGS VERTICAL SINGLE AND HORIZONTAL DOUBLE
    [ 0xd9 ] = 0x2518, //  BOX DRAWINGS LIGHT UP AND LEFT
    [ 0xda ] = 0x250c, //  BOX DRAWINGS LIGHT DOWN AND RIGHT
    [ 0xdb ] = 0x2588, //  FULL BLOCK
    [ 0xdc ] = 0x2584, //  LOWER HALF BLOCK
    [ 0xdd ] = 0x258c, //  LEFT HALF BLOCK
    [ 0xde ] = 0x2590, //  RIGHT HALF BLOCK
    [ 0xdf ] = 0x2580, //  UPPER HALF BLOCK
    [ 0xe0 ] = 0x03b1, //  GREEK SMALL LETTER ALPHA
    [ 0xe1 ] = 0x00df, //  LATIN SMALL LETTER SHARP S
    [ 0xe2 ] = 0x0393, //  GREEK CAPITAL LETTER GAMMA
    [ 0xe3 ] = 0x03c0, //  GREEK SMALL LETTER PI
    [ 0xe4 ] = 0x03a3, //  GREEK CAPITAL LETTER SIGMA
    [ 0xe5 ] = 0x03c3, //  GREEK SMALL LETTER SIGMA
    [ 0xe6 ] = 0x00b5, //  MICRO SIGN
    [ 0xe7 ] = 0x03c4, //  GREEK SMALL LETTER TAU
    [ 0xe8 ] = 0x03a6, //  GREEK CAPITAL LETTER PHI
    [ 0xe9 ] = 0x0398, //  GREEK CAPITAL LETTER THETA
    [ 0xea ] = 0x03a9, //  GREEK CAPITAL LETTER OMEGA
    [ 0xeb ] = 0x03b4, //  GREEK SMALL LETTER DELTA
    [ 0xec ] = 0x221e, //  INFINITY
    [ 0xed ] = 0x03c6, //  GREEK SMALL LETTER PHI
    [ 0xee ] = 0x03b5, //  GREEK SMALL LETTER EPSILON
    [ 0xef ] = 0x2229, //  INTERSECTION
    [ 0xf0 ] = 0x2261, //  IDENTICAL TO
    [ 0xf1 ] = 0x00b1, //  PLUS-MINUS SIGN
    [ 0xf2 ] = 0x2265, //  GREATER-THAN OR EQUAL TO
    [ 0xf3 ] = 0x2264, //  LESS-THAN OR EQUAL TO
    [ 0xf4 ] = 0x2320, //  TOP HALF INTEGRAL
    [ 0xf5 ] = 0x2321, //  BOTTOM HALF INTEGRAL
    [ 0xf6 ] = 0x00f7, //  DIVISION SIGN
    [ 0xf7 ] = 0x2248, //  ALMOST EQUAL TO
    [ 0xf8 ] = 0x00b0, //  DEGREE SIGN
    [ 0xf9 ] = 0x2219, //  BULLET OPERATOR
    [ 0xfa ] = 0x00b7, //  MIDDLE DOT
    [ 0xfb ] = 0x221a, //  SQUARE ROOT
    [ 0xfc ] = 0x207f, //  SUPERSCRIPT LATIN SMALL LETTER N
    [ 0xfd ] = 0x00b2, //  SUPERSCRIPT TWO
    [ 0xfe ] = 0x25a0, //  BLACK SQUARE
    [ 0xff ] = 0x00a0, //  NO-BREAK SPACE
};

u16 cp437_to_unicode(u8 cp437)
{
    return GET_GLOBAL(cp437_to_unicode_map[cp437]);
}