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/*-
* Copyright (c) 2014-2019 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __wt_struct_check --
* Check that the specified packing format is valid, and whether it fits into a fixed-sized
* bitfield.
*/
int
__wt_struct_check(
WT_SESSION_IMPL *session, const char *fmt, size_t len, bool *fixedp, uint32_t *fixed_lenp)
{
WT_DECL_PACK_VALUE(pv);
WT_DECL_RET;
WT_PACK pack;
int fields;
WT_RET(__pack_initn(session, &pack, fmt, len));
for (fields = 0; (ret = __pack_next(&pack, &pv)) == 0; fields++)
;
WT_RET_NOTFOUND_OK(ret);
if (fixedp != NULL && fixed_lenp != NULL) {
if (fields == 0) {
*fixedp = 1;
*fixed_lenp = 0;
} else if (fields == 1 && pv.type == 't') {
*fixedp = 1;
*fixed_lenp = pv.size;
} else
*fixedp = 0;
}
return (0);
}
/*
* __wt_struct_confchk --
* Check that the specified packing format is valid, configuration version.
*/
int
__wt_struct_confchk(WT_SESSION_IMPL *session, WT_CONFIG_ITEM *v)
{
return (__wt_struct_check(session, v->str, v->len, NULL, NULL));
}
/*
* __wt_struct_size --
* Calculate the size of a packed byte string.
*/
int
__wt_struct_size(WT_SESSION_IMPL *session, size_t *lenp, const char *fmt, ...)
{
WT_DECL_RET;
va_list ap;
va_start(ap, fmt);
ret = __wt_struct_sizev(session, lenp, fmt, ap);
va_end(ap);
return (ret);
}
/*
* __wt_struct_pack --
* Pack a byte string.
*/
int
__wt_struct_pack(WT_SESSION_IMPL *session, void *buffer, size_t len, const char *fmt, ...)
{
WT_DECL_RET;
va_list ap;
va_start(ap, fmt);
ret = __wt_struct_packv(session, buffer, len, fmt, ap);
va_end(ap);
return (ret);
}
/*
* __wt_struct_unpack --
* Unpack a byte string.
*/
int
__wt_struct_unpack(WT_SESSION_IMPL *session, const void *buffer, size_t len, const char *fmt, ...)
{
WT_DECL_RET;
va_list ap;
va_start(ap, fmt);
ret = __wt_struct_unpackv(session, buffer, len, fmt, ap);
va_end(ap);
return (ret);
}
/*
* __wt_struct_repack --
* Return the subset of the packed buffer that represents part of the format. If the result is
* not contiguous in the existing buffer, a buffer is reallocated and filled.
*/
int
__wt_struct_repack(WT_SESSION_IMPL *session, const char *infmt, const char *outfmt,
const WT_ITEM *inbuf, WT_ITEM *outbuf)
{
WT_DECL_PACK_VALUE(pvin);
WT_DECL_PACK_VALUE(pvout);
WT_DECL_RET;
WT_PACK packin, packout;
const uint8_t *before, *end, *p;
const void *start;
start = NULL;
p = inbuf->data;
end = p + inbuf->size;
WT_RET(__pack_init(session, &packout, outfmt));
WT_RET(__pack_init(session, &packin, infmt));
/* Outfmt should complete before infmt */
while ((ret = __pack_next(&packout, &pvout)) == 0) {
if (p >= end)
WT_RET(EINVAL);
if (pvout.type == 'x' && pvout.size == 0 && pvout.havesize)
continue;
WT_RET(__pack_next(&packin, &pvin));
before = p;
WT_RET(__unpack_read(session, &pvin, &p, (size_t)(end - p)));
if (pvout.type != pvin.type)
WT_RET(ENOTSUP);
if (start == NULL)
start = before;
}
WT_RET_NOTFOUND_OK(ret);
/* Be paranoid - __pack_write should never overflow. */
WT_ASSERT(session, p <= end);
outbuf->data = start;
outbuf->size = WT_PTRDIFF(p, start);
return (0);
}
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