src/lib-mail/message-part.c

	message-part.c revision 3e7c452d738b53faaf373b9a57384b59d6ea56c6
/* Copyright (c) 2014 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "message-part.h"

unsigned int message_part_to_idx(const struct message_part *part)
{
    const struct message_part *p;
    unsigned int n;

    if (part->parent == NULL) {
        /* root */
        return 0;
    }
    for (n = 0, p = part->parent->children; p != part; p = p->next, n++)
        ;
    return n + 1 + message_part_to_idx(part->parent);
}

static struct message_part *
message_sub_part_by_idx(struct message_part *parts,
            unsigned int idx)
{
    struct message_part *part = parts;

    for (; part != NULL && idx > 0; part = part->next) {
        if (part->children_count >= idx)
            return message_sub_part_by_idx(part->children, idx-1);
        idx -= part->children_count + 1;
    }
    return part;
}

struct message_part *
message_part_by_idx(struct message_part *parts, unsigned int idx)
{
    i_assert(parts->parent == NULL);

    return message_sub_part_by_idx(parts, idx);
}