multipart.c

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#include "config.h"
#include <stdbool.h>
#include <stddef.h>
#include "mutt/lib.h"
#include "email/lib.h"
#include "multipart.h"
#include "sendlib.h"

static int get_toplevel_encoding(struct Body *b)
{
  int e = ENC_7BIT;
 
  for (; b; b = b->next)
  {
    if (b->encoding == ENC_BINARY)
      return ENC_BINARY;
    if (b->encoding == ENC_8BIT)
      e = ENC_8BIT;
  }
 
  return e;
}

#define BOUNDARY_MAX_DEPTH 50

static bool check_boundary(const char *boundary, struct Body *b, int depth)
{
  if (depth >= BOUNDARY_MAX_DEPTH)
    return false;
 
  char *p = NULL;
 
  if (b->parts && check_boundary(boundary, b->parts, depth + 1))
    return true;
 
  if (b->next && check_boundary(boundary, b->next, depth))
    return true;
 
  p = mutt_param_get(&b->parameter, "boundary");
  if (p && mutt_str_equal(p, boundary))
  {
    return true;
  }
  return false;
}

void mutt_generate_boundary(struct ParameterList *pl)
{
  char rs[MUTT_RANDTAG_LEN + 1];
 
  mutt_rand_base32(rs, sizeof(rs) - 1);
  rs[MUTT_RANDTAG_LEN] = 0;
  mutt_param_set(pl, "boundary", rs);
}

struct Body *mutt_make_multipart(struct Body *b)
{
  struct Body *b_new = mutt_body_new();
  b_new->type = TYPE_MULTIPART;
  b_new->subtype = mutt_str_dup("mixed");
  b_new->encoding = get_toplevel_encoding(b);
  do
  {
    mutt_generate_boundary(&b_new->parameter);
    if (check_boundary(mutt_param_get(&b_new->parameter, "boundary"), b, 0))
      mutt_param_delete(&b_new->parameter, "boundary");
  } while (!mutt_param_get(&b_new->parameter, "boundary"));
  b_new->use_disp = false;
  b_new->disposition = DISP_INLINE;
  b_new->parts = b;
 
  return b_new;
}

struct Body *mutt_remove_multipart(struct Body *b)
{
  struct Body *t = NULL;
 
  if (b->parts)
  {
    t = b;
    b = b->parts;
    t->parts = NULL;
    mutt_body_free(&t);
  }
  return b;
}