Mime Encoder API

Prototype for an encoding function. More...

Functions
static size_t	b_encoder (char *res, const char *src, size_t srclen, const char *tocode)
	Base64 Encode a string - Implements encoder_t -.
static size_t	q_encoder (char *res, const char *src, size_t srclen, const char *tocode)
	Quoted-printable Encode a string - Implements encoder_t -.

Detailed Description

Prototype for an encoding function.

Parameters

res	Buffer for the result
src	String to encode
srclen	Length of string to encode
tocode	Character encoding

Return values

num	Bytes written to buffer

Function Documentation

b_encoder()

static size_t b_encoder ( char * res, const char * src, size_t srclen, const char * tocode )

static

Base64 Encode a string - Implements encoder_t -.

Definition at line 77 of file rfc2047.c.

{
  char *s0 = res;
 
  memcpy(res, "=?", 2);
  res += 2;
  memcpy(res, tocode, strlen(tocode));
  res += strlen(tocode);
  memcpy(res, "?B?", 3);
  res += 3;
 
  while (srclen)
  {
    char encoded[11] = { 0 };
    size_t rc;
    size_t in_len = MIN(3, srclen);
 
    rc = mutt_b64_encode(src, in_len, encoded, sizeof(encoded));
    for (size_t i = 0; i < rc; i++)
      *res++ = encoded[i];
 
    srclen -= in_len;
    src += in_len;
  }
 
  memcpy(res, "?=", 2);
  res += 2;
  return res - s0;
}

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q_encoder()

static size_t q_encoder ( char * res, const char * src, size_t srclen, const char * tocode )

static

Quoted-printable Encode a string - Implements encoder_t -.

Definition at line 110 of file rfc2047.c.

{
  static const char hex[] = "0123456789ABCDEF";
  char *s0 = res;
 
  memcpy(res, "=?", 2);
  res += 2;
  memcpy(res, tocode, strlen(tocode));
  res += strlen(tocode);
  memcpy(res, "?Q?", 3);
  res += 3;
  while (srclen--)
  {
    unsigned char c = *src++;
    if (c == ' ')
    {
      *res++ = '_';
    }
    else if ((c >= 0x7f) || (c < 0x20) || (c == '_') || strchr(RFC2047Specials, c))
    {
      *res++ = '=';
      *res++ = hex[(c & 0xf0) >> 4];
      *res++ = hex[c & 0x0f];
    }
    else
    {
      *res++ = c;
    }
  }
  memcpy(res, "?=", 2);
  res += 2;
  return res - s0;
}

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