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make fetching of partial UID ranges more flexible

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instead of a single hard-coded branch, use a generic method to split
ranges as needed.

this is of course entirely over-engineered as of now, but subsequent
commits will make good use of it.
This commit is contained in:
Oswald Buddenhagen 2016-12-18 21:24:16 +01:00
parent 1d3b36f89e
commit 3d64f16702
1 changed files with 40 additions and 13 deletions
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53
src/drv_imap.c
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@ -2322,6 +2322,33 @@ imap_prepare_load_box( store_t *gctx, int opts )
gctx->opts = opts; gctx->opts = opts;
} }
enum { WantSize = 1, WantTuids = 2 };
typedef struct imap_range {
int first, last, flags;
} imap_range_t;
static void
imap_set_range( imap_range_t *ranges, int *nranges, int low_flags, int high_flags, int maxlow )
{
if (low_flags != high_flags) {
for (int r = 0; r < *nranges; r++) {
if (ranges[r].first > maxlow)
break; /* Range starts above split point; so do all subsequent ranges. */
if (ranges[r].last < maxlow)
continue; /* Range ends below split point; try next one. */
if (ranges[r].last != maxlow) {
/* Range does not end exactly at split point; need to split. */
memmove( &ranges[r + 1], &ranges[r], ((*nranges)++ - r) * sizeof(*ranges) );
ranges[r].last = maxlow;
ranges[r + 1].first = maxlow + 1;
}
break;
}
}
for (int r = 0; r < *nranges; r++)
ranges[r].flags |= (ranges[r].last <= maxlow) ? low_flags : high_flags;
}
static void imap_submit_load( imap_store_t *, const char *, int, struct imap_cmd_refcounted_state * ); static void imap_submit_load( imap_store_t *, const char *, int, struct imap_cmd_refcounted_state * );
static void static void
@ -2353,31 +2380,31 @@ imap_load_box( store_t *gctx, int minuid, int maxuid, int newuid, int_array_t ex
if (maxuid == INT_MAX) if (maxuid == INT_MAX)
maxuid = ctx->gen.uidnext ? ctx->gen.uidnext - 1 : 0x7fffffff; maxuid = ctx->gen.uidnext ? ctx->gen.uidnext - 1 : 0x7fffffff;
if (maxuid >= minuid) { if (maxuid >= minuid) {
if ((ctx->gen.opts & OPEN_FIND) && minuid < newuid) { imap_range_t ranges[2];
sprintf( buf, "%d:%d", minuid, newuid - 1 ); ranges[0].first = minuid;
imap_submit_load( ctx, buf, 0, sts ); ranges[0].last = maxuid;
if (newuid > maxuid) ranges[0].flags = shifted_bit( ctx->gen.opts, OPEN_SIZE, WantSize);
goto done; int nranges = 1;
sprintf( buf, "%d:%d", newuid, maxuid ); if (ctx->gen.opts & OPEN_FIND)
} else { imap_set_range( ranges, &nranges, 0, WantTuids, newuid - 1 );
sprintf( buf, "%d:%d", minuid, maxuid ); for (int r = 0; r < nranges; r++) {
sprintf( buf, "%d:%d", ranges[r].first, ranges[r].last );
imap_submit_load( ctx, buf, ranges[r].flags, sts );
} }
imap_submit_load( ctx, buf, (ctx->gen.opts & OPEN_FIND), sts );
} }
done:
free( excs.data ); free( excs.data );
imap_refcounted_done( sts ); imap_refcounted_done( sts );
} }
} }
static void static void
imap_submit_load( imap_store_t *ctx, const char *buf, int tuids, struct imap_cmd_refcounted_state *sts ) imap_submit_load( imap_store_t *ctx, const char *buf, int flags, struct imap_cmd_refcounted_state *sts )
{ {
imap_exec( ctx, imap_refcounted_new_cmd( sts ), imap_refcounted_done_box, imap_exec( ctx, imap_refcounted_new_cmd( sts ), imap_refcounted_done_box,
"UID FETCH %s (UID%s%s%s)", buf, "UID FETCH %s (UID%s%s%s)", buf,
(ctx->gen.opts & OPEN_FLAGS) ? " FLAGS" : "", (ctx->gen.opts & OPEN_FLAGS) ? " FLAGS" : "",
(ctx->gen.opts & OPEN_SIZE) ? " RFC822.SIZE" : "", (flags & WantSize) ? " RFC822.SIZE" : "",
tuids ? " BODY.PEEK[HEADER.FIELDS (X-TUID)]" : ""); (flags & WantTuids) ? " BODY.PEEK[HEADER.FIELDS (X-TUID)]" : "");
} }
/******************* imap_fetch_msg *******************/ /******************* imap_fetch_msg *******************/