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/*
* Decode a single UTF-8 character.
*/
#include "putty.h"
#include "misc.h"
unsigned long decode_utf8(const char **utf8)
{
unsigned char c = (unsigned char)*(*utf8)++;
/* One-byte cases. */
if (c < 0x80) {
return c;
} else if (c < 0xC0) {
return 0xFFFD; /* spurious continuation byte */
}
unsigned long wc, min;
size_t ncont;
if (c < 0xE0) {
wc = c & 0x1F; ncont = 1; min = 0x80;
} else if (c < 0xF0) {
wc = c & 0x0F; ncont = 2; min = 0x800;
} else if (c < 0xF8) {
wc = c & 0x07; ncont = 3; min = 0x10000;
} else if (c < 0xFC) {
wc = c & 0x03; ncont = 4; min = 0x200000;
} else if (c < 0xFE) {
wc = c & 0x01; ncont = 5; min = 0x4000000;
} else {
return 0xFFFD; /* FE or FF illegal bytes */
}
while (ncont-- > 0) {
unsigned char cont = (unsigned char)**utf8;
if (!(0x80 <= cont && cont < 0xC0))
return 0xFFFD; /* short sequence */
(*utf8)++;
wc = (wc << 6) | (cont & 0x3F);
}
if (wc < min)
return 0xFFFD; /* overlong encoding */
if (0xD800 <= wc && wc < 0xE000)
return 0xFFFD; /* UTF-8 encoding of surrogate */
if (wc > 0x10FFFF)
return 0xFFFD; /* outside Unicode range */
return wc;
}
#ifdef TEST
#include <stdio.h>
bool dotest(const char *file, int line, const char *input,
const unsigned long *chars, size_t nchars)
{
const char *start = input;
const char *end = input + strlen(input) + 1;
size_t noutput = 0;
printf("%s:%d: test start\n", file, line);
while (input < end) {
const char *before = input;
unsigned long wc = decode_utf8(&input);
printf("%s:%d in+%"SIZEu" out+%"SIZEu":",
file, line, (size_t)(before-start), noutput);
while (before < input)
printf(" %02x", (unsigned)(unsigned char)(*before++));
printf(" -> U-%08lx\n", wc);
if (noutput >= nchars) {
printf("%s:%d: FAIL: expected no further output\n", file, line);
return false;
}
if (chars[noutput] != wc) {
printf("%s:%d: FAIL: expected U-%08lx\n",
file, line, chars[noutput]);
return false;
}
noutput++;
}
if (noutput < nchars) {
printf("%s:%d: FAIL: expected further output\n", file, line);
return false;
}
printf("%s:%d: pass\n", file, line);
return true;
}
#define DOTEST(input, ...) do { \
static const unsigned long chars[] = { __VA_ARGS__, 0 }; \
ntest++; \
if (dotest(__FILE__, __LINE__, input, chars, lenof(chars))) \
npass++; \
} while (0)
int main(void)
{
int ntest = 0, npass = 0;
DOTEST("\xCE\xBA\xE1\xBD\xB9\xCF\x83\xCE\xBC\xCE\xB5",
0x03BA, 0x1F79, 0x03C3, 0x03BC, 0x03B5);
/* First sequence of each length (not counting NUL, which is
* tested anyway by the string-termination handling in every test) */
DOTEST("\xC2\x80", 0x0080);
DOTEST("\xE0\xA0\x80", 0x0800);
DOTEST("\xF0\x90\x80\x80", 0x00010000);
DOTEST("\xF8\x88\x80\x80\x80", 0xFFFD); /* would be 0x00200000 */
DOTEST("\xFC\x84\x80\x80\x80\x80", 0xFFFD); /* would be 0x04000000 */
/* Last sequence of each length */
DOTEST("\x7F", 0x007F);
DOTEST("\xDF\xBF", 0x07FF);
DOTEST("\xEF\xBF\xBF", 0xFFFF);
DOTEST("\xF7\xBF\xBF\xBF", 0xFFFD); /* would be 0x001FFFFF */
DOTEST("\xFB\xBF\xBF\xBF\xBF", 0xFFFD); /* would be 0x03FFFFFF */
DOTEST("\xFD\xBF\xBF\xBF\xBF\xBF", 0xFFFD); /* would be 0x7FFFFFFF */
/* Endpoints of the surrogate range */
DOTEST("\xED\x9F\xBF", 0xD7FF);
DOTEST("\xED\xA0\x00", 0xFFFD); /* would be 0xD800 */
DOTEST("\xED\xBF\xBF", 0xFFFD); /* would be 0xDFFF */
DOTEST("\xEE\x80\x80", 0xE000);
/* REPLACEMENT CHARACTER itself */
DOTEST("\xEF\xBF\xBD", 0xFFFD);
/* Endpoints of the legal Unicode range */
DOTEST("\xF4\x8F\xBF\xBF", 0x0010FFFF);
DOTEST("\xF4\x90\x80\x80", 0xFFFD); /* would be 0x00110000 */
/* Spurious continuation bytes, each shown as a separate failure */
DOTEST("\x80 \x81\x82 \xBD\xBE\xBF",
0xFFFD, 0x0020, 0xFFFD, 0xFFFD, 0x0020, 0xFFFD, 0xFFFD, 0xFFFD);
/* Truncated sequences, each shown as just one failure */
DOTEST("\xC2\xE0\xA0\xF0\x90\x80\xF8\x88\x80\x80\xFC\x84\x80\x80\x80",
0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD, 0xFFFD);
DOTEST("\xC2 \xE0\xA0 \xF0\x90\x80 \xF8\x88\x80\x80 \xFC\x84\x80\x80\x80",
0xFFFD, 0x0020, 0xFFFD, 0x0020, 0xFFFD, 0x0020, 0xFFFD, 0x0020,
0xFFFD);
/* Illegal bytes */
DOTEST("\xFE\xFF", 0xFFFD, 0xFFFD);
/* Overlong sequences */
DOTEST("\xC1\xBF", 0xFFFD);
DOTEST("\xE0\x9F\xBF", 0xFFFD);
DOTEST("\xF0\x8F\xBF\xBF", 0xFFFD);
DOTEST("\xF8\x87\xBF\xBF\xBF", 0xFFFD);
DOTEST("\xFC\x83\xBF\xBF\xBF\xBF", 0xFFFD);
DOTEST("\xC0\x80", 0xFFFD);
DOTEST("\xE0\x80\x80", 0xFFFD);
DOTEST("\xF0\x80\x80\x80", 0xFFFD);
DOTEST("\xF8\x80\x80\x80\x80", 0xFFFD);
DOTEST("\xFC\x80\x80\x80\x80\x80", 0xFFFD);
printf("%d tests %d passed", ntest, npass);
if (npass < ntest) {
printf(" %d FAILED\n", ntest-npass);
return 1;
} else {
printf("\n");
return 0;
}
}
#endif
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