ESPTerm - ESP8266 terminal emulator. Branches: [master] patches, [work] next release
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espterm-firmware/user/apars_utf8.c

117 lines
2.6 KiB

//
// Created by MightyPork on 2017/08/20.
//
// UTF-8 parser - collects bytes of a code point before writing them
// into a screen cell.
//
#include "apars_utf8.h"
#include "apars_logging.h"
#include "screen.h"
#include "uart_driver.h"
#include "ansi_parser_callbacks.h"
#include "ansi_parser.h"
static u8 bytes[4];
static int utf_len = 0;
static int utf_j = 0;
ETSTimer timerResumeRx;
void ICACHE_FLASH_ATTR resumeRxCb(void *unused)
{
ansi_dbg("Parser recover.");
ansi_parser_inhibit = false;
}
/**
* Clear the buffer where we collect pieces of a code point.
* This is used for parser reset.
*/
void ICACHE_FLASH_ATTR
apars_reset_utf8buffer(void)
{
utf_len = 0;
utf_j = 0;
memset(bytes, 0, 4);
}
// Code Points First Byte Second Byte Third Byte Fourth Byte
// U+0000 - U+007F 00 - 7F
// U+0080 - U+07FF C2 - DF 80 - BF
// U+0800 - U+0FFF E0 *A0 - BF 80 - BF
// U+1000 - U+CFFF E1 - EC 80 - BF 80 - BF
// U+D000 - U+D7FF ED 80 - *9F 80 - BF
// U+E000 - U+FFFF EE - EF 80 - BF 80 - BF
// U+10000 - U+3FFFF F0 *90 - BF 80 - BF 80 - BF
// U+40000 - U+FFFFF F1 - F3 80 - BF 80 - BF 80 - BF
// U+100000 - U+10FFFF F4 80 - *8F 80 - BF 80 - BF
/**
* Handle a received plain character
* @param c - received character
*/
void ICACHE_FLASH_ATTR
apars_handle_plainchar(char c)
{
// collecting unicode glyphs...
if (c & 0x80) {
if (utf_len == 0) {
// start
if (c == 0xC0 || c == 0xC1 || c > 0xF4) {
// forbidden start codes
goto fail;
}
if ((c & 0xE0) == 0xC0) {
utf_len = 2;
}
else if ((c & 0xF0) == 0xE0) {
utf_len = 3;
}
else if ((c & 0xF8) == 0xF0) {
utf_len = 4;
}
else {
// chars over 127 that don't start unicode sequences
goto fail;
}
bytes[0] = c;
utf_j = 1;
}
else {
if ((c & 0xC0) != 0x80) {
goto fail;
}
else {
bytes[utf_j++] = c;
if (utf_j >= utf_len) {
// check for bad sequences
if (bytes[0] == 0xF4 && bytes[1] > 0x8F) goto fail;
if (bytes[0] == 0xF0 && bytes[1] < 0x90) goto fail;
if (bytes[0] == 0xED && bytes[1] > 0x9F) goto fail;
if (bytes[0] == 0xE0 && bytes[1] < 0xA0) goto fail;
screen_putchar((const char *) bytes);
apars_reset_utf8buffer();
}
}
}
}
else {
bytes[0] = c;
bytes[1] = 0; // just to make sure it's closed...
screen_putchar((const char *) bytes);
}
return;
fail:
ansi_parser_inhibit = true;
ansi_warn("BAD UTF8!");
apars_show_context();
apars_reset_utf8buffer();
ansi_dbg("Temporarily inhibiting parser...");
TIMER_START(&timerResumeRx, resumeRxCb, 1000, 0);
}