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Added Base64 encoder for attachments.

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Bobbi Webber-Manners 2020-07-21 22:26:32 -04:00
parent 359a7c1018
commit 927944ce4c
1 changed files with 48 additions and 2 deletions
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50
apps/email.c
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@ -4,8 +4,8 @@
// Bobbi June, July 2020
/////////////////////////////////////////////////////////////////
// - TODO: Add Base64 encoding
// - TODO: Feature to attach files to outgoing messages
// - TODO: email_pager() mis-pages if one line of input->many lines of output
// - TODO: Get rid of all uses of malloc(). Don't need it.
// - TODO: See TODOs further down for error handling
@ -586,7 +586,7 @@ static const int8_t b64dec[] =
42,43,44,45,46,47,48,49,50,51};
/*
* Decode linebuf[] from Base64 format in place
* Decode Base64 format in place
* Each line of base64 has up to 76 chars, which decodes to up to 57 bytes
* p - Pointer to buffer to decode. Results written in place.
* Returns number of bytes decoded
@ -604,6 +604,52 @@ uint16_t decode_base64(char *p) {
return j;
}
/*
* Base64 encode table
*/
static const char b64enc[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890+/";
/*
* Encode Base64 format
* p - Pointer to source buffer
* q - Pointer to destination buffer
* len - Length of buffer to encode
* Returns length of encoded data
*/
uint16_t encode_base64(char *p, char *q, uint16_t len) {
uint16_t j = 0;
uint16_t i, ii;
for (i = 0; i < len / 3; ++i) {
ii = 3 * i;
q[j++] = b64enc[(p[ii] & 0xfc) >> 2];
q[j++] = b64enc[((p[ii] & 0x03) << 4) | ((p[ii + 1] & 0xf0) >> 4)];
q[j++] = b64enc[((p[ii + 1] & 0x0f) << 2) | ((p[ii + 2] & 0xc0) >> 6)];
q[j++] = b64enc[(p[ii + 2] & 0x3f)];
}
ii += 3;
i = len - ii; // Bytes remaining to encode
switch (i) {
case 0:
goto done;
case 1:
q[j++] = b64enc[(p[ii] & 0xfc) >> 2];
q[j++] = b64enc[(p[ii] & 0x03) << 4];
q[j++] = '=';
q[j++] = '=';
break;
case 2:
q[j++] = b64enc[(p[ii] & 0xfc) >> 2];
q[j++] = b64enc[((p[ii] & 0x03) << 4) | ((p[ii + 1] & 0xf0) >> 4)];
q[j++] = b64enc[(p[ii + 1] & 0x0f) << 2];
q[j++] = '=';
break;
}
done:
q[j++] = '\0';
return j;
}
/*
* Print line up to first '\r' or '\0'
*/