Jeff Sharkey | 5b78a3a | 2013-02-19 17:28:10 -0800 | [diff] [blame] | 1 | #include "vterm_internal.h" |
| 2 | |
| 3 | #define UNICODE_INVALID 0xFFFD |
| 4 | |
Elliott Hughes | 6d78f36 | 2014-12-04 19:52:44 -0800 | [diff] [blame] | 5 | #if defined(DEBUG) && DEBUG > 1 |
Jeff Sharkey | 5b78a3a | 2013-02-19 17:28:10 -0800 | [diff] [blame] | 6 | # define DEBUG_PRINT_UTF8 |
| 7 | #endif |
| 8 | |
| 9 | struct UTF8DecoderData { |
| 10 | // number of bytes remaining in this codepoint |
| 11 | int bytes_remaining; |
| 12 | |
| 13 | // number of bytes total in this codepoint once it's finished |
| 14 | // (for detecting overlongs) |
| 15 | int bytes_total; |
| 16 | |
| 17 | int this_cp; |
| 18 | }; |
| 19 | |
| 20 | static void init_utf8(VTermEncoding *enc, void *data_) |
| 21 | { |
| 22 | struct UTF8DecoderData *data = data_; |
| 23 | |
| 24 | data->bytes_remaining = 0; |
| 25 | data->bytes_total = 0; |
| 26 | } |
| 27 | |
| 28 | static void decode_utf8(VTermEncoding *enc, void *data_, |
| 29 | uint32_t cp[], int *cpi, int cplen, |
| 30 | const char bytes[], size_t *pos, size_t bytelen) |
| 31 | { |
| 32 | struct UTF8DecoderData *data = data_; |
| 33 | |
| 34 | #ifdef DEBUG_PRINT_UTF8 |
| 35 | printf("BEGIN UTF-8\n"); |
| 36 | #endif |
| 37 | |
| 38 | for(; *pos < bytelen && *cpi < cplen; (*pos)++) { |
| 39 | unsigned char c = bytes[*pos]; |
| 40 | |
| 41 | #ifdef DEBUG_PRINT_UTF8 |
| 42 | printf(" pos=%zd c=%02x rem=%d\n", *pos, c, data->bytes_remaining); |
| 43 | #endif |
| 44 | |
| 45 | if(c < 0x20) |
| 46 | return; |
| 47 | |
| 48 | else if(c >= 0x20 && c < 0x80) { |
| 49 | if(data->bytes_remaining) |
| 50 | cp[(*cpi)++] = UNICODE_INVALID; |
| 51 | |
| 52 | cp[(*cpi)++] = c; |
| 53 | #ifdef DEBUG_PRINT_UTF8 |
| 54 | printf(" UTF-8 char: U+%04x\n", c); |
| 55 | #endif |
| 56 | data->bytes_remaining = 0; |
| 57 | } |
| 58 | |
| 59 | else if(c >= 0x80 && c < 0xc0) { |
| 60 | if(!data->bytes_remaining) { |
| 61 | cp[(*cpi)++] = UNICODE_INVALID; |
| 62 | continue; |
| 63 | } |
| 64 | |
| 65 | data->this_cp <<= 6; |
| 66 | data->this_cp |= c & 0x3f; |
| 67 | data->bytes_remaining--; |
| 68 | |
| 69 | if(!data->bytes_remaining) { |
| 70 | #ifdef DEBUG_PRINT_UTF8 |
| 71 | printf(" UTF-8 raw char U+%04x bytelen=%d ", data->this_cp, data->bytes_total); |
| 72 | #endif |
| 73 | // Check for overlong sequences |
| 74 | switch(data->bytes_total) { |
| 75 | case 2: |
| 76 | if(data->this_cp < 0x0080) data->this_cp = UNICODE_INVALID; break; |
| 77 | case 3: |
| 78 | if(data->this_cp < 0x0800) data->this_cp = UNICODE_INVALID; break; |
| 79 | case 4: |
| 80 | if(data->this_cp < 0x10000) data->this_cp = UNICODE_INVALID; break; |
| 81 | case 5: |
| 82 | if(data->this_cp < 0x200000) data->this_cp = UNICODE_INVALID; break; |
| 83 | case 6: |
| 84 | if(data->this_cp < 0x4000000) data->this_cp = UNICODE_INVALID; break; |
| 85 | } |
| 86 | // Now look for plain invalid ones |
| 87 | if((data->this_cp >= 0xD800 && data->this_cp <= 0xDFFF) || |
| 88 | data->this_cp == 0xFFFE || |
| 89 | data->this_cp == 0xFFFF) |
| 90 | data->this_cp = UNICODE_INVALID; |
| 91 | #ifdef DEBUG_PRINT_UTF8 |
| 92 | printf(" char: U+%04x\n", data->this_cp); |
| 93 | #endif |
| 94 | cp[(*cpi)++] = data->this_cp; |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | else if(c >= 0xc0 && c < 0xe0) { |
| 99 | if(data->bytes_remaining) |
| 100 | cp[(*cpi)++] = UNICODE_INVALID; |
| 101 | |
| 102 | data->this_cp = c & 0x1f; |
| 103 | data->bytes_total = 2; |
| 104 | data->bytes_remaining = 1; |
| 105 | } |
| 106 | |
| 107 | else if(c >= 0xe0 && c < 0xf0) { |
| 108 | if(data->bytes_remaining) |
| 109 | cp[(*cpi)++] = UNICODE_INVALID; |
| 110 | |
| 111 | data->this_cp = c & 0x0f; |
| 112 | data->bytes_total = 3; |
| 113 | data->bytes_remaining = 2; |
| 114 | } |
| 115 | |
| 116 | else if(c >= 0xf0 && c < 0xf8) { |
| 117 | if(data->bytes_remaining) |
| 118 | cp[(*cpi)++] = UNICODE_INVALID; |
| 119 | |
| 120 | data->this_cp = c & 0x07; |
| 121 | data->bytes_total = 4; |
| 122 | data->bytes_remaining = 3; |
| 123 | } |
| 124 | |
| 125 | else if(c >= 0xf8 && c < 0xfc) { |
| 126 | if(data->bytes_remaining) |
| 127 | cp[(*cpi)++] = UNICODE_INVALID; |
| 128 | |
| 129 | data->this_cp = c & 0x03; |
| 130 | data->bytes_total = 5; |
| 131 | data->bytes_remaining = 4; |
| 132 | } |
| 133 | |
| 134 | else if(c >= 0xfc && c < 0xfe) { |
| 135 | if(data->bytes_remaining) |
| 136 | cp[(*cpi)++] = UNICODE_INVALID; |
| 137 | |
| 138 | data->this_cp = c & 0x01; |
| 139 | data->bytes_total = 6; |
| 140 | data->bytes_remaining = 5; |
| 141 | } |
| 142 | |
| 143 | else { |
| 144 | cp[(*cpi)++] = UNICODE_INVALID; |
| 145 | } |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | static VTermEncoding encoding_utf8 = { |
| 150 | .init = &init_utf8, |
| 151 | .decode = &decode_utf8, |
| 152 | }; |
| 153 | |
| 154 | static void decode_usascii(VTermEncoding *enc, void *data, |
| 155 | uint32_t cp[], int *cpi, int cplen, |
| 156 | const char bytes[], size_t *pos, size_t bytelen) |
| 157 | { |
| 158 | int is_gr = bytes[*pos] & 0x80; |
| 159 | |
| 160 | for(; *pos < bytelen && *cpi < cplen; (*pos)++) { |
| 161 | unsigned char c = bytes[*pos] ^ is_gr; |
| 162 | |
| 163 | if(c < 0x20 || c >= 0x80) |
| 164 | return; |
| 165 | |
| 166 | cp[(*cpi)++] = c; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | static VTermEncoding encoding_usascii = { |
| 171 | .decode = &decode_usascii, |
| 172 | }; |
| 173 | |
| 174 | struct StaticTableEncoding { |
| 175 | const VTermEncoding enc; |
| 176 | const uint32_t chars[128]; |
| 177 | }; |
| 178 | |
| 179 | static void decode_table(VTermEncoding *enc, void *data, |
| 180 | uint32_t cp[], int *cpi, int cplen, |
| 181 | const char bytes[], size_t *pos, size_t bytelen) |
| 182 | { |
| 183 | struct StaticTableEncoding *table = (struct StaticTableEncoding *)enc; |
| 184 | int is_gr = bytes[*pos] & 0x80; |
| 185 | |
| 186 | for(; *pos < bytelen && *cpi < cplen; (*pos)++) { |
| 187 | unsigned char c = bytes[*pos] ^ is_gr; |
| 188 | |
| 189 | if(c < 0x20 || c >= 0x80) |
| 190 | return; |
| 191 | |
| 192 | if(table->chars[c]) |
| 193 | cp[(*cpi)++] = table->chars[c]; |
| 194 | else |
| 195 | cp[(*cpi)++] = c; |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | #include "encoding/DECdrawing.inc" |
| 200 | #include "encoding/uk.inc" |
| 201 | |
| 202 | static struct { |
| 203 | VTermEncodingType type; |
| 204 | char designation; |
| 205 | VTermEncoding *enc; |
| 206 | } |
| 207 | encodings[] = { |
| 208 | { ENC_UTF8, 'u', &encoding_utf8 }, |
| 209 | { ENC_SINGLE_94, '0', (VTermEncoding*)&encoding_DECdrawing }, |
| 210 | { ENC_SINGLE_94, 'A', (VTermEncoding*)&encoding_uk }, |
| 211 | { ENC_SINGLE_94, 'B', &encoding_usascii }, |
Jeff Sharkey | 73fbfc3 | 2013-04-23 10:34:06 -0700 | [diff] [blame] | 212 | { 0 }, |
Jeff Sharkey | 5b78a3a | 2013-02-19 17:28:10 -0800 | [diff] [blame] | 213 | }; |
| 214 | |
Elliott Hughes | 6d78f36 | 2014-12-04 19:52:44 -0800 | [diff] [blame] | 215 | /* This ought to be INTERNAL but isn't because it's used by unit testing */ |
Jeff Sharkey | 5b78a3a | 2013-02-19 17:28:10 -0800 | [diff] [blame] | 216 | VTermEncoding *vterm_lookup_encoding(VTermEncodingType type, char designation) |
| 217 | { |
| 218 | for(int i = 0; encodings[i].designation; i++) |
| 219 | if(encodings[i].type == type && encodings[i].designation == designation) |
| 220 | return encodings[i].enc; |
| 221 | return NULL; |
| 222 | } |