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Accept input of escaped 16-bit Unicode characters

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This commit is contained in:
Robin Stuart 2020-08-04 11:48:43 +01:00
parent 4ddcfb3613
commit 04f6f81e68
2 changed files with 33 additions and 0 deletions
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30
backend/library.c
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@ -886,6 +886,7 @@ static int escape_char_process(struct zint_symbol *symbol, unsigned char *input_
int error_number;
int in_posn, out_posn;
int hex1, hex2;
int i, unicode;
#ifndef _MSC_VER
unsigned char escaped_string[*length + 1];
@ -963,6 +964,35 @@ static int escape_char_process(struct zint_symbol *symbol, unsigned char *input_
case '\\': escaped_string[out_posn] = '\\';
in_posn += 2;
break;
case 'u':
if (in_posn + 6 > *length) {
strcpy(symbol->errtxt, "235: Incomplete unicode escape character in input data");
return ZINT_ERROR_INVALID_DATA;
}
unicode = 0;
for (i = 0; i < 4; i++) {
if (ctoi(input_string[in_posn + i + 2]) == -1) {
strcpy(symbol->errtxt, "236: Corrupt unicode escape character in input data");
return ZINT_ERROR_INVALID_DATA;
}
unicode = unicode << 4;
unicode += ctoi(input_string[in_posn + i + 2]);
}
if (unicode >= 0x800) {
escaped_string[out_posn] = 0xe0 + ((unicode & 0xf000) >> 12);
out_posn++;
escaped_string[out_posn] = 0x80 + ((unicode & 0x0fc0) >> 6);
out_posn++;
escaped_string[out_posn] = 0x80 + (unicode & 0x003f);
} else if (unicode >= 0x80) {
escaped_string[out_posn] = 0xc0 + ((unicode & 0x07c0) >> 6);
out_posn++;
escaped_string[out_posn] = 0x80 + (unicode & 0x003f);
} else {
escaped_string[out_posn] = unicode & 0x7f;
}
in_posn += 6;
break;
default: strcpy(symbol->errtxt, "234: Unrecognised escape character in input data");
return ZINT_ERROR_INVALID_DATA;
break;

3
docs/manual.txt
View File

@ -215,6 +215,9 @@ Escape Character | ASCII Equivalent | Interpretation
\\ | 0x5C | Backslash
\xNN | 0xNN | Any other 8-bit character
| | where NN is hexadecimal
\uNNNN | | Any 16-bit Unicode
| | character where NNNN
| | is hexadecimal
--------------------------------------------------------------------
Input data can be read directly from file using the -i switch as shown below.