FreeCalypso > hg > falcon-mail-tools
view f-demime/qpdec.c @ 6:cd2dcf6eed67
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author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 06 May 2023 15:24:38 +0000 |
parents | 612c4d0df768 |
children |
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/* * This module implements quoted-printable decoding. */ #include <ctype.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include "defs.h" extern void (*dec_outf)(); int qpdec_err_flag; static void strip_trailing_lwsp(line) char *line; { char *cp; cp = index(line, '\0'); while (cp > line && isspace(cp[-1])) cp--; *cp = '\0'; } static int decode_hex_digit(c) { if (isdigit(c)) return(c - '0'); else if (isupper(c)) return(c - 'A' + 10); else return(c - 'a' + 10); } static int decode_hex_byte(cp) char *cp; { int u, l; u = decode_hex_digit(cp[0]); l = decode_hex_digit(cp[1]); return (u << 4) | l; } void qpdec_input_line(line, unterm) char *line; { char *cp; int c; strip_trailing_lwsp(line); for (cp = line; *cp; ) { c = *cp++ & 0xFF; if (c != '=') { dec_outf(c); continue; } if (!*cp) { if (unterm) qpdec_err_flag = 1; return; } if (isxdigit(cp[0]) && isxdigit(cp[1])) { c = decode_hex_byte(cp); cp += 2; dec_outf(c); continue; } qpdec_err_flag = 1; dec_outf('='); } if (!unterm) dec_outf('\n'); }