/*
 * kmscon - VT Emulator
 *
 * Copyright (c) 2012 David Herrmann <dh.herrmann@googlemail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files
 * (the "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/*
 * VTE Character Sets
 * These are predefined charactersets that can be loaded into GL and GR. By
 * default we use unicode_lower and unicode_upper, that is, both sets have the
 * exact unicode mapping. unicode_lower is effectively ASCII and unicode_upper
 * as defined by the unicode standard.
 * Several other character sets are defined here. However, all of them are
 * limited to the 96 character space of GL or GR. Everything beyond GR (which
 * was not supported by the classic VTs by DEC but is available in VT emulators
 * that support unicode/UTF8) is always mapped to unicode and cannot be changed
 * by these character sets. Even mapping GL and GR is only available for
 * backwards compatibility as new applications can use the Unicode functionality
 * of the VTE.
 *
 * Moreover, mapping GR is almost unnecessary to support. In fact, Unicode UTF-8
 * support in VTE works by reading every incoming data as UTF-8 stream. This
 * maps GL/ASCII to ASCII, as UTF-8 is backwards compatible to ASCII, however,
 * everything that has the 8th bit set is a >=2-byte haracter in UTF-8. That is,
 * this is in no way backwards compatible to >=VT220 8bit support. Therefore, if
 * someone maps a character set into GR and wants to use them with this VTE,
 * then they must already send UTF-8 characters to use GR (all GR characters are
 * 8-bits). Hence, they can easily also send the correct UTF-8 character for the
 * unicode mapping.
 * The only advantage is that most characters in many sets are 3-byte UTF-8
 * characters and by mapping the set into GR/GL you can use 2 or 1 byte UTF-8
 * characters which saves bandwidth.
 * Another reason is, if you have older applications that use the VT220 8-bit
 * support and you put a ASCII/8bit-extension to UTF-8 converter in between, you
 * need these mappings to have the application behave correctly if it uses GL/GR
 * mappings extensively.
 *
 * Anyway, we support GL/GR mappings so here are the most commonly used maps as
 * defined by Unicode-standard, DEC-private maps and other famous charmaps.
 *
 * Characters 1-32 are always the control characters (part of CL) and cannot be
 * mapped. Characters 34-127 (94 characters) are part of GL and can be mapped.
 * Characters 33 and 128 are not part of GL and always mapped by VTE but are
 * included here in the maps for alignment reasons but always set to 0.
 */

#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include "log.h"
#include "unicode.h"
#include "vte.h"

#define LOG_SUBSYSTEM "vte"

/*
 * Lower Unicode character set. This maps the characters to the basic ASCII
 * characters 33-126. These are all graphics characters defined in ASCII. The
 * first an last entry are never used so we can safely set them to anything.
 */
kmscon_vte_charset kmscon_vte_unicode_lower = {
	[0] = 0,
	[1] = 33,
	[2] = 34,
	[3] = 35,
	[4] = 36,
	[5] = 37,
	[6] = 38,
	[7] = 39,
	[8] = 40,
	[9] = 41,
	[10] = 42,
	[11] = 43,
	[12] = 44,
	[13] = 45,
	[14] = 46,
	[15] = 47,
	[16] = 48,
	[17] = 49,
	[18] = 50,
	[19] = 51,
	[20] = 52,
	[21] = 53,
	[22] = 54,
	[23] = 55,
	[24] = 56,
	[25] = 57,
	[26] = 58,
	[27] = 59,
	[28] = 60,
	[29] = 61,
	[30] = 62,
	[31] = 63,
	[32] = 64,
	[33] = 65,
	[34] = 66,
	[35] = 67,
	[36] = 68,
	[37] = 69,
	[38] = 70,
	[39] = 71,
	[40] = 72,
	[41] = 73,
	[42] = 74,
	[43] = 75,
	[44] = 76,
	[45] = 77,
	[46] = 78,
	[47] = 79,
	[48] = 80,
	[49] = 81,
	[50] = 82,
	[51] = 83,
	[52] = 84,
	[53] = 85,
	[54] = 86,
	[55] = 87,
	[56] = 88,
	[57] = 89,
	[58] = 90,
	[59] = 91,
	[60] = 92,
	[61] = 93,
	[62] = 94,
	[63] = 95,
	[64] = 96,
	[65] = 97,
	[66] = 98,
	[67] = 99,
	[68] = 100,
	[69] = 101,
	[70] = 102,
	[71] = 103,
	[72] = 104,
	[73] = 105,
	[74] = 106,
	[75] = 107,
	[76] = 108,
	[77] = 109,
	[78] = 110,
	[79] = 111,
	[80] = 112,
	[81] = 113,
	[82] = 114,
	[83] = 115,
	[84] = 116,
	[85] = 117,
	[86] = 118,
	[87] = 119,
	[88] = 120,
	[89] = 121,
	[90] = 122,
	[91] = 123,
	[92] = 124,
	[93] = 125,
	[94] = 126,
	[95] = 0,
};

/*
 * Upper Unicode Table
 * This maps all characters to the upper unicode characters 161-254. These are
 * not compatible to any older 8 bit character sets. See the Unicode standard
 * for the definitions of each symbol. Again, the first an last entry are never
 * used so set them to 0.
 */
kmscon_vte_charset kmscon_vte_unicode_upper = {
	[0] = 0,
	[1] = 161,
	[2] = 162,
	[3] = 163,
	[4] = 164,
	[5] = 165,
	[6] = 166,
	[7] = 167,
	[8] = 168,
	[9] = 169,
	[10] = 170,
	[11] = 171,
	[12] = 172,
	[13] = 173,
	[14] = 174,
	[15] = 175,
	[16] = 176,
	[17] = 177,
	[18] = 178,
	[19] = 179,
	[20] = 180,
	[21] = 181,
	[22] = 182,
	[23] = 183,
	[24] = 184,
	[25] = 185,
	[26] = 186,
	[27] = 187,
	[28] = 188,
	[29] = 189,
	[30] = 190,
	[31] = 191,
	[32] = 192,
	[33] = 193,
	[34] = 194,
	[35] = 195,
	[36] = 196,
	[37] = 197,
	[38] = 198,
	[39] = 199,
	[40] = 200,
	[41] = 201,
	[42] = 202,
	[43] = 203,
	[44] = 204,
	[45] = 205,
	[46] = 206,
	[47] = 207,
	[48] = 208,
	[49] = 209,
	[50] = 210,
	[51] = 211,
	[52] = 212,
	[53] = 213,
	[54] = 214,
	[55] = 215,
	[56] = 216,
	[57] = 217,
	[58] = 218,
	[59] = 219,
	[60] = 220,
	[61] = 221,
	[62] = 222,
	[63] = 223,
	[64] = 224,
	[65] = 225,
	[66] = 226,
	[67] = 227,
	[68] = 228,
	[69] = 229,
	[70] = 230,
	[71] = 231,
	[72] = 232,
	[73] = 233,
	[74] = 234,
	[75] = 235,
	[76] = 236,
	[77] = 237,
	[78] = 238,
	[79] = 239,
	[80] = 240,
	[81] = 241,
	[82] = 242,
	[83] = 243,
	[84] = 244,
	[85] = 245,
	[86] = 246,
	[87] = 247,
	[88] = 248,
	[89] = 249,
	[90] = 250,
	[91] = 251,
	[92] = 252,
	[93] = 253,
	[94] = 254,
	[95] = 0,
};

/*
 * The DEC supplemental graphics set. For its definition see here:
 *  http://vt100.net/docs/vt220-rm/table2-3b.html
 * Its basically a mixture of common European symbols that are not part of
 * ASCII. Most often, this is mapped into GR to extend the basci ASCII part.
 *
 * This is very similar to unicode_upper, however, few symbols differ so do not
 * mix them up!
 */
kmscon_vte_charset kmscon_vte_dec_supplemental_graphics = {
	[0] = 0,
	[1] = 161,
	[2] = 162,
	[3] = 163,
	[4] = 0,
	[5] = 165,
	[6] = 0,
	[7] = 167,
	[8] = 164,
	[9] = 169,
	[10] = 170,
	[11] = 171,
	[12] = 0,
	[13] = 0,
	[14] = 0,
	[15] = 0,
	[16] = 176,
	[17] = 177,
	[18] = 178,
	[19] = 179,
	[20] = 0,
	[21] = 181,
	[22] = 182,
	[23] = 183,
	[24] = 0,
	[25] = 185,
	[26] = 186,
	[27] = 187,
	[28] = 188,
	[29] = 189,
	[30] = 0,
	[31] = 191,
	[32] = 192,
	[33] = 193,
	[34] = 194,
	[35] = 195,
	[36] = 196,
	[37] = 197,
	[38] = 198,
	[39] = 199,
	[40] = 200,
	[41] = 201,
	[42] = 202,
	[43] = 203,
	[44] = 204,
	[45] = 205,
	[46] = 206,
	[47] = 207,
	[48] = 0,
	[49] = 209,
	[50] = 210,
	[51] = 211,
	[52] = 212,
	[53] = 213,
	[54] = 214,
	[55] = 338,
	[56] = 216,
	[57] = 217,
	[58] = 218,
	[59] = 219,
	[60] = 220,
	[61] = 376,
	[62] = 0,
	[63] = 223,
	[64] = 224,
	[65] = 225,
	[66] = 226,
	[67] = 227,
	[68] = 228,
	[69] = 229,
	[70] = 230,
	[71] = 231,
	[72] = 232,
	[73] = 233,
	[74] = 234,
	[75] = 235,
	[76] = 236,
	[77] = 237,
	[78] = 238,
	[79] = 239,
	[80] = 0,
	[81] = 241,
	[82] = 242,
	[83] = 243,
	[84] = 244,
	[85] = 245,
	[86] = 246,
	[87] = 339,
	[88] = 248,
	[89] = 249,
	[90] = 250,
	[91] = 251,
	[92] = 252,
	[93] = 255,
	[94] = 0,
	[95] = 0,
};

/*
 * DEC special graphics character set. See here for its definition:
 *  http://vt100.net/docs/vt220-rm/table2-4.html
 * This contains several characters to create ASCII drawings and similar. Its
 * commonaly mapped into GR to extend the basic ASCII characters.
 *
 * Lower 62 characters map to ASCII 33-64, everything beyond is special and
 * commonly used for ASCII drawings. It depends on the Unicode Standard 3.2 for
 * the extended horizontal scan-line characters 3, 5, 7, and 9.
 */
kmscon_vte_charset kmscon_vte_dec_special_graphics = {
	[0] = 0,
	[1] = 33,
	[2] = 34,
	[3] = 35,
	[4] = 36,
	[5] = 37,
	[6] = 38,
	[7] = 39,
	[8] = 40,
	[9] = 41,
	[10] = 42,
	[11] = 43,
	[12] = 44,
	[13] = 45,
	[14] = 46,
	[15] = 47,
	[16] = 48,
	[17] = 49,
	[18] = 50,
	[19] = 51,
	[20] = 52,
	[21] = 53,
	[22] = 54,
	[23] = 55,
	[24] = 56,
	[25] = 57,
	[26] = 58,
	[27] = 59,
	[28] = 60,
	[29] = 61,
	[30] = 62,
	[31] = 63,
	[32] = 64,
	[33] = 65,
	[34] = 66,
	[35] = 67,
	[36] = 68,
	[37] = 69,
	[38] = 70,
	[39] = 71,
	[40] = 72,
	[41] = 73,
	[42] = 74,
	[43] = 75,
	[44] = 76,
	[45] = 77,
	[46] = 78,
	[47] = 79,
	[48] = 80,
	[49] = 81,
	[50] = 82,
	[51] = 83,
	[52] = 84,
	[53] = 85,
	[54] = 86,
	[55] = 87,
	[56] = 88,
	[57] = 89,
	[58] = 90,
	[59] = 91,
	[60] = 92,
	[61] = 93,
	[62] = 94,
	[63] = 0,
	[64] = 9830,
	[65] = 9618,
	[66] = 9225,
	[67] = 9228,
	[68] = 9229,
	[69] = 9226,
	[70] = 176,
	[71] = 177,
	[72] = 9252,
	[73] = 9227,
	[74] = 9496,
	[75] = 9488,
	[76] = 9484,
	[77] = 9492,
	[78] = 9532,
	[79] = 9146,
	[80] = 9147,
	[81] = 9472,
	[82] = 9148,
	[83] = 9149,
	[84] = 9500,
	[85] = 9508,
	[86] = 9524,
	[87] = 9516,
	[88] = 9474,
	[89] = 8804,
	[90] = 8805,
	[91] = 960,
	[92] = 8800,
	[93] = 163,
	[94] = 8901,
	[95] = 0,
};