root / libsylph / quoted-printable.c @ aebfd4cc
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| 1 | /*
|
|---|---|
| 2 | * LibSylph -- E-Mail client library |
| 3 | * Copyright (C) 1999-2011 Hiroyuki Yamamoto |
| 4 | */ |
| 5 | |
| 6 | #include <glib.h> |
| 7 | #include <ctype.h> |
| 8 | |
| 9 | static gboolean get_hex_value(guchar *out, gchar c1, gchar c2);
|
| 10 | static void get_hex_str(gchar *out, guchar ch); |
| 11 | |
| 12 | #define MAX_LINELEN 76 |
| 13 | |
| 14 | #define IS_LBREAK(p) \
|
| 15 | (*(p) == '\0' || *(p) == '\n' || (*(p) == '\r' && *((p) + 1) == '\n')) |
| 16 | |
| 17 | #define SOFT_LBREAK_IF_REQUIRED(n) \
|
| 18 | if (len + (n) > MAX_LINELEN || \
|
| 19 | (len + (n) == MAX_LINELEN && (!IS_LBREAK(inp + 1)))) { \
|
| 20 | *outp++ = '='; \
|
| 21 | *outp++ = '\n'; \
|
| 22 | len = 0; \
|
| 23 | } |
| 24 | |
| 25 | void qp_encode_line(gchar *out, const guchar *in) |
| 26 | {
|
| 27 | const guchar *inp = in;
|
| 28 | gchar *outp = out; |
| 29 | guchar ch; |
| 30 | gint len = 0;
|
| 31 | |
| 32 | while (*inp != '\0') { |
| 33 | ch = *inp; |
| 34 | |
| 35 | if (IS_LBREAK(inp)) {
|
| 36 | *outp++ = '\n';
|
| 37 | len = 0;
|
| 38 | if (*inp == '\r') |
| 39 | inp++; |
| 40 | inp++; |
| 41 | } else if (ch == '\t' || ch == ' ') { |
| 42 | if (IS_LBREAK(inp + 1)) { |
| 43 | SOFT_LBREAK_IF_REQUIRED(3);
|
| 44 | *outp++ = '=';
|
| 45 | get_hex_str(outp, ch); |
| 46 | outp += 2;
|
| 47 | len += 3;
|
| 48 | inp++; |
| 49 | } else {
|
| 50 | SOFT_LBREAK_IF_REQUIRED(1);
|
| 51 | *outp++ = *inp++; |
| 52 | len++; |
| 53 | } |
| 54 | } else if ((ch >= 33 && ch <= 60) || (ch >= 62 && ch <= 126)) { |
| 55 | SOFT_LBREAK_IF_REQUIRED(1);
|
| 56 | *outp++ = *inp++; |
| 57 | len++; |
| 58 | } else {
|
| 59 | SOFT_LBREAK_IF_REQUIRED(3);
|
| 60 | *outp++ = '=';
|
| 61 | get_hex_str(outp, ch); |
| 62 | outp += 2;
|
| 63 | len += 3;
|
| 64 | inp++; |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | if (len > 0) |
| 69 | *outp++ = '\n';
|
| 70 | |
| 71 | *outp = '\0';
|
| 72 | } |
| 73 | |
| 74 | gint qp_decode_line(gchar *str) |
| 75 | {
|
| 76 | gchar *inp = str, *outp = str; |
| 77 | |
| 78 | while (*inp != '\0') { |
| 79 | if (*inp == '=') { |
| 80 | if (inp[1] && inp[2] && |
| 81 | get_hex_value((guchar *)outp, inp[1], inp[2]) |
| 82 | == TRUE) {
|
| 83 | inp += 3;
|
| 84 | } else if (inp[1] == '\0' || g_ascii_isspace(inp[1])) { |
| 85 | /* soft line break */
|
| 86 | break;
|
| 87 | } else {
|
| 88 | /* broken QP string */
|
| 89 | *outp = *inp++; |
| 90 | } |
| 91 | } else {
|
| 92 | *outp = *inp++; |
| 93 | } |
| 94 | outp++; |
| 95 | } |
| 96 | |
| 97 | *outp = '\0';
|
| 98 | |
| 99 | return outp - str;
|
| 100 | } |
| 101 | |
| 102 | gint qp_decode_q_encoding(guchar *out, const gchar *in, gint inlen)
|
| 103 | {
|
| 104 | const gchar *inp = in;
|
| 105 | guchar *outp = out; |
| 106 | |
| 107 | if (inlen < 0) |
| 108 | inlen = G_MAXINT; |
| 109 | |
| 110 | while (inp - in < inlen && *inp != '\0') { |
| 111 | if (*inp == '=' && inp + 3 - in <= inlen) { |
| 112 | if (get_hex_value(outp, inp[1], inp[2]) == TRUE) { |
| 113 | inp += 3;
|
| 114 | } else {
|
| 115 | *outp = *inp++; |
| 116 | } |
| 117 | } else if (*inp == '_') { |
| 118 | *outp = ' ';
|
| 119 | inp++; |
| 120 | } else {
|
| 121 | *outp = *inp++; |
| 122 | } |
| 123 | outp++; |
| 124 | } |
| 125 | |
| 126 | *outp = '\0';
|
| 127 | |
| 128 | return outp - out;
|
| 129 | } |
| 130 | |
| 131 | gint qp_get_q_encoding_len(const guchar *str)
|
| 132 | {
|
| 133 | const guchar *inp = str;
|
| 134 | gint len = 0;
|
| 135 | |
| 136 | while (*inp != '\0') { |
| 137 | if (*inp == 0x20) |
| 138 | len++; |
| 139 | else if (*inp == '=' || *inp == '?' || *inp == '_' || |
| 140 | *inp < 32 || *inp > 127 || g_ascii_isspace(*inp)) |
| 141 | len += 3;
|
| 142 | else
|
| 143 | len++; |
| 144 | |
| 145 | inp++; |
| 146 | } |
| 147 | |
| 148 | return len;
|
| 149 | } |
| 150 | |
| 151 | void qp_q_encode(gchar *out, const guchar *in) |
| 152 | {
|
| 153 | const guchar *inp = in;
|
| 154 | gchar *outp = out; |
| 155 | |
| 156 | while (*inp != '\0') { |
| 157 | if (*inp == 0x20) |
| 158 | *outp++ = '_';
|
| 159 | else if (*inp == '=' || *inp == '?' || *inp == '_' || |
| 160 | *inp < 32 || *inp > 127 || g_ascii_isspace(*inp)) { |
| 161 | *outp++ = '=';
|
| 162 | get_hex_str(outp, *inp); |
| 163 | outp += 2;
|
| 164 | } else
|
| 165 | *outp++ = *inp; |
| 166 | |
| 167 | inp++; |
| 168 | } |
| 169 | |
| 170 | *outp = '\0';
|
| 171 | } |
| 172 | |
| 173 | #define HEX_TO_INT(val, hex) \
|
| 174 | { \
|
| 175 | gchar c = hex; \ |
| 176 | \ |
| 177 | if ('0' <= c && c <= '9') { \ |
| 178 | val = c - '0'; \
|
| 179 | } else if ('a' <= c && c <= 'f') { \ |
| 180 | val = c - 'a' + 10; \ |
| 181 | } else if ('A' <= c && c <= 'F') { \ |
| 182 | val = c - 'A' + 10; \ |
| 183 | } else { \
|
| 184 | val = -1; \
|
| 185 | } \ |
| 186 | } |
| 187 | |
| 188 | static gboolean get_hex_value(guchar *out, gchar c1, gchar c2)
|
| 189 | {
|
| 190 | gint hi, lo; |
| 191 | |
| 192 | HEX_TO_INT(hi, c1); |
| 193 | HEX_TO_INT(lo, c2); |
| 194 | |
| 195 | if (hi == -1 || lo == -1) |
| 196 | return FALSE;
|
| 197 | |
| 198 | *out = (hi << 4) + lo;
|
| 199 | return TRUE;
|
| 200 | } |
| 201 | |
| 202 | #define INT_TO_HEX(hex, val) \
|
| 203 | { \
|
| 204 | if ((val) < 10) \ |
| 205 | hex = '0' + (val); \
|
| 206 | else \
|
| 207 | hex = 'A' + (val) - 10; \ |
| 208 | } |
| 209 | |
| 210 | static void get_hex_str(gchar *out, guchar ch) |
| 211 | {
|
| 212 | gchar hex; |
| 213 | |
| 214 | INT_TO_HEX(hex, ch >> 4);
|
| 215 | *out++ = hex; |
| 216 | INT_TO_HEX(hex, ch & 0x0f);
|
| 217 | *out++ = hex; |
| 218 | } |