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/* Copyright (C) 2020 C. McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* Additional permission under GNU GPL version 3 section 7:
*
* If you modify this Program, or any covered work, by linking or
* combining it with OpenSSL (or a modified version of that library),
* containing parts covered by the terms of the OpenSSL License and the
* original SSLeay license, the licensors of this Program grant you
* additional permission to convey the resulting work. Corresponding
* Source for a non-source form of such a combination shall include the
* source code for the parts of OpenSSL used as well as that of the
* covered work.
*/
#ifndef IMAP_H
#define IMAP_H
#include <err.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#define ENUM_ATOM \
X(AtomNil, "NIL") \
X(AtomUntagged, "*") \
X(AtomContinue, "+") \
X(AtomOk, "OK") \
X(AtomNo, "NO") \
X(AtomBad, "BAD") \
X(AtomPreauth, "PREAUTH") \
X(AtomBye, "BYE") \
X(AtomUIDNext, "UIDNEXT") \
X(AtomUIDValidity, "UIDVALIDITY") \
X(AtomFetch, "FETCH") \
X(AtomThread, "THREAD") \
X(AtomUID, "UID") \
X(AtomEnvelope, "ENVELOPE") \
X(AtomBodyStructure, "BODYSTRUCTURE") \
X(AtomBody, "BODY") \
X(AtomDot, ".") \
X(AtomHeader, "HEADER") \
X(AtomText, "TEXT")
enum Atom {
#define X(id, str) id,
ENUM_ATOM
#undef X
AtomCap = 1024,
};
extern const char *Atoms[AtomCap];
static inline enum Atom atomn(const char *str, size_t len) {
enum Atom i;
for (i = 0; i < AtomCap; ++i) {
if (!Atoms[i]) break;
if (strlen(Atoms[i]) != len) continue;
if (!strncasecmp(Atoms[i], str, len)) return i;
}
if (i == AtomCap) errx(EX_SOFTWARE, "atom capacity exceeded");
Atoms[i] = strndup(str, len);
if (!Atoms[i]) err(EX_OSERR, "strndup");
return i;
}
static inline enum Atom atom(const char *str) {
return atomn(str, strlen(str));
}
struct Data {
enum Type {
Atom,
Number,
String,
List,
} type;
union {
enum Atom atom;
uint32_t number;
char *string;
struct List {
size_t cap;
size_t len;
struct Data *ptr;
} list;
};
};
static inline struct Data dataCheck(struct Data data, enum Type type) {
const char *Types[] = { "atom", "number", "string", "list" };
if (data.type != type) {
errx(
EX_PROTOCOL, "expected %s, found %s",
Types[type], Types[data.type]
);
}
return data;
}
static inline struct Data dataTake(struct Data *from) {
struct Data take = *from;
from->type = Atom;
from->atom = AtomNil;
return take;
}
static inline void listPush(struct List *list, struct Data data) {
if (list->len == list->cap) {
list->cap = (list->cap ? list->cap * 2 : 4);
list->ptr = realloc(list->ptr, sizeof(*list->ptr) * list->cap);
if (!list->ptr) err(EX_OSERR, "realloc");
}
list->ptr[list->len++] = data;
}
static inline void listFlatten(struct List *flat, struct List nested) {
for (size_t i = 0; i < nested.len; ++i) {
if (nested.ptr[i].type == List) {
listFlatten(flat, nested.ptr[i].list);
} else {
listPush(flat, nested.ptr[i]);
}
}
}
static inline void dataFree(struct Data data);
static inline void listFree(struct List list) {
for (size_t i = 0; i < list.len; ++i) {
dataFree(list.ptr[i]);
}
free(list.ptr);
}
static inline void dataFree(struct Data data) {
if (data.type == String) free(data.string);
if (data.type == List) listFree(data.list);
}
struct Resp {
enum Atom tag;
uint32_t number;
enum Atom resp;
struct List code;
struct List data;
const char *text;
};
static inline void respFree(struct Resp resp) {
listFree(resp.code);
listFree(resp.data);
}
extern bool imapVerbose;
struct IMAP {
FILE *r;
FILE *w;
size_t cap;
char *buf;
char *ptr;
};
struct IMAP imapOpen(const char *host, const char *port);
struct Resp imapResp(struct IMAP *imap);
#endif /* IMAP_H */
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