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#include "vterm_internal.h"
#define UNICODE_INVALID 0xFFFD
#if defined(DEBUG) && DEBUG > 1
# define DEBUG_PRINT_UTF8
#endif
struct UTF8DecoderData {
// number of bytes remaining in this codepoint
int bytes_remaining;
// number of bytes total in this codepoint once it's finished
// (for detecting overlongs)
int bytes_total;
int this_cp;
};
static void init_utf8(VTermEncoding *enc, void *data_)
{
struct UTF8DecoderData *data = data_;
data->bytes_remaining = 0;
data->bytes_total = 0;
}
static void decode_utf8(VTermEncoding *enc, void *data_,
uint32_t cp[], int *cpi, int cplen,
const char bytes[], size_t *pos, size_t bytelen)
{
struct UTF8DecoderData *data = data_;
#ifdef DEBUG_PRINT_UTF8
printf("BEGIN UTF-8\n");
#endif
for(; *pos < bytelen && *cpi < cplen; (*pos)++) {
unsigned char c = bytes[*pos];
#ifdef DEBUG_PRINT_UTF8
printf(" pos=%zd c=%02x rem=%d\n", *pos, c, data->bytes_remaining);
#endif
if(c < 0x20) // C0
return;
else if(c >= 0x20 && c < 0x7f) {
if(data->bytes_remaining)
cp[(*cpi)++] = UNICODE_INVALID;
cp[(*cpi)++] = c;
#ifdef DEBUG_PRINT_UTF8
printf(" UTF-8 char: U+%04x\n", c);
#endif
data->bytes_remaining = 0;
}
else if(c == 0x7f) // DEL
return;
else if(c >= 0x80 && c < 0xc0) {
if(!data->bytes_remaining) {
cp[(*cpi)++] = UNICODE_INVALID;
continue;
}
data->this_cp <<= 6;
data->this_cp |= c & 0x3f;
data->bytes_remaining--;
if(!data->bytes_remaining) {
#ifdef DEBUG_PRINT_UTF8
printf(" UTF-8 raw char U+%04x bytelen=%d ", data->this_cp, data->bytes_total);
#endif
// Check for overlong sequences
switch(data->bytes_total) {
case 2:
if(data->this_cp < 0x0080) data->this_cp = UNICODE_INVALID;
break;
case 3:
if(data->this_cp < 0x0800) data->this_cp = UNICODE_INVALID;
break;
case 4:
if(data->this_cp < 0x10000) data->this_cp = UNICODE_INVALID;
break;
case 5:
if(data->this_cp < 0x200000) data->this_cp = UNICODE_INVALID;
break;
case 6:
if(data->this_cp < 0x4000000) data->this_cp = UNICODE_INVALID;
break;
}
// Now look for plain invalid ones
if((data->this_cp >= 0xD800 && data->this_cp <= 0xDFFF) ||
data->this_cp == 0xFFFE ||
data->this_cp == 0xFFFF)
data->this_cp = UNICODE_INVALID;
#ifdef DEBUG_PRINT_UTF8
printf(" char: U+%04x\n", data->this_cp);
#endif
cp[(*cpi)++] = data->this_cp;
}
}
else if(c >= 0xc0 && c < 0xe0) {
if(data->bytes_remaining)
cp[(*cpi)++] = UNICODE_INVALID;
data->this_cp = c & 0x1f;
data->bytes_total = 2;
data->bytes_remaining = 1;
}
else if(c >= 0xe0 && c < 0xf0) {
if(data->bytes_remaining)
cp[(*cpi)++] = UNICODE_INVALID;
data->this_cp = c & 0x0f;
data->bytes_total = 3;
data->bytes_remaining = 2;
}
else if(c >= 0xf0 && c < 0xf8) {
if(data->bytes_remaining)
cp[(*cpi)++] = UNICODE_INVALID;
data->this_cp = c & 0x07;
data->bytes_total = 4;
data->bytes_remaining = 3;
}
else if(c >= 0xf8 && c < 0xfc) {
if(data->bytes_remaining)
cp[(*cpi)++] = UNICODE_INVALID;
data->this_cp = c & 0x03;
data->bytes_total = 5;
data->bytes_remaining = 4;
}
else if(c >= 0xfc && c < 0xfe) {
if(data->bytes_remaining)
cp[(*cpi)++] = UNICODE_INVALID;
data->this_cp = c & 0x01;
data->bytes_total = 6;
data->bytes_remaining = 5;
}
else {
cp[(*cpi)++] = UNICODE_INVALID;
}
}
}
static VTermEncoding encoding_utf8 = {
.init = &init_utf8,
.decode = &decode_utf8,
};
static void decode_usascii(VTermEncoding *enc, void *data,
uint32_t cp[], int *cpi, int cplen,
const char bytes[], size_t *pos, size_t bytelen)
{
int is_gr = bytes[*pos] & 0x80;
for(; *pos < bytelen && *cpi < cplen; (*pos)++) {
unsigned char c = bytes[*pos] ^ is_gr;
if(c < 0x20 || c == 0x7f || c >= 0x80)
return;
cp[(*cpi)++] = c;
}
}
static VTermEncoding encoding_usascii = {
.decode = &decode_usascii,
};
struct StaticTableEncoding {
const VTermEncoding enc;
const uint32_t chars[128];
};
static void decode_table(VTermEncoding *enc, void *data,
uint32_t cp[], int *cpi, int cplen,
const char bytes[], size_t *pos, size_t bytelen)
{
struct StaticTableEncoding *table = (struct StaticTableEncoding *)enc;
int is_gr = bytes[*pos] & 0x80;
for(; *pos < bytelen && *cpi < cplen; (*pos)++) {
unsigned char c = bytes[*pos] ^ is_gr;
if(c < 0x20 || c == 0x7f || c >= 0x80)
return;
if(table->chars[c])
cp[(*cpi)++] = table->chars[c];
else
cp[(*cpi)++] = c;
}
}
#include "encoding/DECdrawing.inc"
#include "encoding/uk.inc"
static struct {
VTermEncodingType type;
char designation;
VTermEncoding *enc;
}
encodings[] = {
{ ENC_UTF8, 'u', &encoding_utf8 },
{ ENC_SINGLE_94, '0', (VTermEncoding*)&encoding_DECdrawing },
{ ENC_SINGLE_94, 'A', (VTermEncoding*)&encoding_uk },
{ ENC_SINGLE_94, 'B', &encoding_usascii },
{ 0 },
};
/* This ought to be INTERNAL but isn't because it's used by unit testing */
VTermEncoding *vterm_lookup_encoding(VTermEncodingType type, char designation)
{
for(int i = 0; encodings[i].designation; i++)
if(encodings[i].type == type && encodings[i].designation == designation)
return encodings[i].enc;
return NULL;
}
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