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/*-
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* Streaming interface to packing.
*
* This allows applications to pack or unpack records one field at a time.
*/
struct __wt_pack_stream {
WT_PACK pack;
uint8_t *end, *p, *start;
};
/*
* wiredtiger_pack_start --
* Open a stream for packing.
*/
int
wiredtiger_pack_start(WT_SESSION *wt_session,
const char *format, void *buffer, size_t len, WT_PACK_STREAM **psp)
{
WT_DECL_RET;
WT_PACK_STREAM *ps;
WT_SESSION_IMPL *session;
session = (WT_SESSION_IMPL *)wt_session;
WT_RET(__wt_calloc_one(session, &ps));
WT_ERR(__pack_init(session, &ps->pack, format));
ps->p = ps->start = buffer;
ps->end = ps->p + len;
*psp = ps;
if (0) {
err: (void)wiredtiger_pack_close(ps, NULL);
}
return (ret);
}
/*
* wiredtiger_unpack_start --
* Open a stream for unpacking.
*/
int
wiredtiger_unpack_start(WT_SESSION *wt_session, const char *format,
const void *buffer, size_t size, WT_PACK_STREAM **psp)
{
return (wiredtiger_pack_start(
wt_session, format, (void *)buffer, size, psp));
}
/*
* wiredtiger_pack_close --
* Close a packing stream.
*/
int
wiredtiger_pack_close(WT_PACK_STREAM *ps, size_t *usedp)
{
if (usedp != NULL)
*usedp = WT_PTRDIFF(ps->p, ps->start);
if (ps != NULL)
__wt_free(ps->pack.session, ps);
return (0);
}
/*
* wiredtiger_pack_item --
* Pack an item.
*/
int
wiredtiger_pack_item(WT_PACK_STREAM *ps, WT_ITEM *item)
{
WT_DECL_PACK_VALUE(pv);
WT_SESSION_IMPL *session;
session = ps->pack.session;
WT_RET(__pack_next(&ps->pack, &pv));
switch (pv.type) {
case 'U':
case 'u':
pv.u.item.data = item->data;
pv.u.item.size = item->size;
WT_RET(__pack_write(
session, &pv, &ps->p, (size_t)(ps->end - ps->p)));
break;
WT_ILLEGAL_VALUE(session);
}
return (0);
}
/*
* wiredtiger_pack_int --
* Pack a signed integer.
*/
int
wiredtiger_pack_int(WT_PACK_STREAM *ps, int64_t i)
{
WT_DECL_PACK_VALUE(pv);
WT_SESSION_IMPL *session;
session = ps->pack.session;
WT_RET(__pack_next(&ps->pack, &pv));
switch (pv.type) {
case 'b':
case 'h':
case 'i':
case 'l':
case 'q':
pv.u.i = i;
WT_RET(__pack_write(
session, &pv, &ps->p, (size_t)(ps->end - ps->p)));
break;
WT_ILLEGAL_VALUE(session);
}
return (0);
}
/*
* wiredtiger_pack_str --
* Pack a string.
*/
int
wiredtiger_pack_str(WT_PACK_STREAM *ps, const char *s)
{
WT_DECL_PACK_VALUE(pv);
WT_SESSION_IMPL *session;
session = ps->pack.session;
WT_RET(__pack_next(&ps->pack, &pv));
switch (pv.type) {
case 'S':
case 's':
pv.u.s = s;
WT_RET(__pack_write(
session, &pv, &ps->p, (size_t)(ps->end - ps->p)));
break;
WT_ILLEGAL_VALUE(session);
}
return (0);
}
/*
* wiredtiger_pack_uint --
* Pack an unsigned int.
*/
int
wiredtiger_pack_uint(WT_PACK_STREAM *ps, uint64_t u)
{
WT_DECL_PACK_VALUE(pv);
WT_SESSION_IMPL *session;
session = ps->pack.session;
WT_RET(__pack_next(&ps->pack, &pv));
switch (pv.type) {
case 'B':
case 'H':
case 'I':
case 'L':
case 'Q':
case 'R':
case 'r':
case 't':
pv.u.u = u;
WT_RET(__pack_write(
session, &pv, &ps->p, (size_t)(ps->end - ps->p)));
break;
WT_ILLEGAL_VALUE(session);
}
return (0);
}
/*
* wiredtiger_unpack_item --
* Unpack an item.
*/
int
wiredtiger_unpack_item(WT_PACK_STREAM *ps, WT_ITEM *item)
{
WT_DECL_PACK_VALUE(pv);
WT_SESSION_IMPL *session;
session = ps->pack.session;
WT_RET(__pack_next(&ps->pack, &pv));
switch (pv.type) {
case 'U':
case 'u':
WT_RET(__unpack_read(session,
&pv, (const uint8_t **)&ps->p, (size_t)(ps->end - ps->p)));
item->data = pv.u.item.data;
item->size = pv.u.item.size;
break;
WT_ILLEGAL_VALUE(session);
}
return (0);
}
/*
* wiredtiger_unpack_int --
* Unpack a signed integer.
*/
int
wiredtiger_unpack_int(WT_PACK_STREAM *ps, int64_t *ip)
{
WT_DECL_PACK_VALUE(pv);
WT_SESSION_IMPL *session;
session = ps->pack.session;
WT_RET(__pack_next(&ps->pack, &pv));
switch (pv.type) {
case 'b':
case 'h':
case 'i':
case 'l':
case 'q':
WT_RET(__unpack_read(session,
&pv, (const uint8_t **)&ps->p, (size_t)(ps->end - ps->p)));
*ip = pv.u.i;
break;
WT_ILLEGAL_VALUE(session);
}
return (0);
}
/*
* wiredtiger_unpack_str --
* Unpack a string.
*/
int
wiredtiger_unpack_str(WT_PACK_STREAM *ps, const char **sp)
{
WT_DECL_PACK_VALUE(pv);
WT_SESSION_IMPL *session;
session = ps->pack.session;
WT_RET(__pack_next(&ps->pack, &pv));
switch (pv.type) {
case 'S':
case 's':
WT_RET(__unpack_read(session,
&pv, (const uint8_t **)&ps->p, (size_t)(ps->end - ps->p)));
*sp = pv.u.s;
break;
WT_ILLEGAL_VALUE(session);
}
return (0);
}
/*
* wiredtiger_unpack_uint --
* Unpack an unsigned integer.
*/
int
wiredtiger_unpack_uint(WT_PACK_STREAM *ps, uint64_t *up)
{
WT_DECL_PACK_VALUE(pv);
WT_SESSION_IMPL *session;
session = ps->pack.session;
WT_RET(__pack_next(&ps->pack, &pv));
switch (pv.type) {
case 'B':
case 'H':
case 'I':
case 'L':
case 'Q':
case 'R':
case 'r':
case 't':
WT_RET(__unpack_read(session,
&pv, (const uint8_t **)&ps->p, (size_t)(ps->end - ps->p)));
*up = pv.u.u;
break;
WT_ILLEGAL_VALUE(session);
}
return (0);
}
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