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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2013, 2015 Oracle and/or its affiliates. All rights reserved.
*
* $Id$
*/
#ifndef _DB_BLOB_H_
#define _DB_BLOB_H_
#if defined(__cplusplus)
extern "C" {
#endif
/*
* How many characters can the path for a blob file use?
* Up to 6 subdirectory separators.
* Up to 6 directory names of up to three characters each.
* Up to 21 characters for blob_id identifier.
* 7 characters for the standard prefix (__db.bl)
* 1 for luck (or NULL)
* The largest blob id, 9,223,372,036,854,775,807 would
* produce a path and file name:
* 009/223/372/036/854/775/807/__db.bl009223372036854775807
*/
#define MAX_BLOB_PATH "009/223/372/036/854/775/807/__db.bl009223372036854775807"
#define MAX_BLOB_PATH_SZ sizeof(MAX_BLOB_PATH)
#define BLOB_DEFAULT_DIR "__db_bl"
#define BLOB_META_FILE_NAME "__db_blob_meta.db"
#define BLOB_DIR_PREFIX "__db"
#define BLOB_FILE_PREFIX "__db.bl"
#define BLOB_DIR_ELEMS 1000
#define IS_BLOB_META(name) \
(name != NULL && strstr(name, BLOB_META_FILE_NAME) != NULL)
#define IS_BLOB_FILE(name) \
(name != NULL && strstr(name, BLOB_FILE_PREFIX) != NULL)
/*
* Combines two unsigned 32 bit integers into a 64 bit integer.
* Blob database file ids and sub database ids are 64 bit integers,
* but have to be stored on database metadata pages that must
* be readable on 32 bit only compilers. So the ids are split into
* two 32 bit integers, and combined when needed.
*/
#define GET_LO_HI(e, lo, hi, o, ret) do { \
DB_ASSERT((e), sizeof(o) <= 8); \
if (sizeof(o) == 8) { \
(o) = (hi); \
(o) = ((o) << 32); \
(o) += (lo); \
} else { \
if ((hi) > 0) { \
__db_errx((e), DB_STR("0765", \
"Offset or id size overflow.")); \
(ret) = EINVAL; \
} \
(o) = (lo); \
} \
} while (0);
#define GET_BLOB_FILE_ID(e, p, o, ret) \
GET_LO_HI(e, (p)->blob_file_lo, (p)->blob_file_hi, o, ret);
#define GET_BLOB_SDB_ID(e, p, o, ret) \
GET_LO_HI(e, (p)->blob_sdb_lo, (p)->blob_sdb_hi, o, ret);
/* Splits a 64 bit integer into two unsigned 32 bit integers. */
#define SET_LO_HI(p, v, type, field_lo, field_hi) do { \
u_int32_t tmp; \
if (sizeof((v)) == 8) { \
tmp = (u_int32_t)((v) >> 32); \
memcpy(((u_int8_t *)p) + SSZ(type, field_hi), \
&tmp, sizeof(u_int32_t)); \
} else { \
memset(((u_int8_t *)p) + SSZ(type, field_hi), \
0, sizeof(u_int32_t)); \
} \
tmp = (u_int32_t)(v); \
memcpy(((u_int8_t *)p) + SSZ(type, field_lo), \
&tmp, sizeof(u_int32_t)); \
} while (0);
#define SET_LO_HI_VAR(v, field_lo, field_hi) do { \
if (sizeof((v)) == 8) \
field_hi = (u_int32_t)((v) >> 32); \
else \
field_hi = 0; \
field_lo = (u_int32_t)(v); \
} while (0);
#define SET_BLOB_META_FILE_ID(p, v, type) \
SET_LO_HI(p, v, type, blob_file_lo, blob_file_hi);
#define SET_BLOB_META_SDB_ID(p, v, type) \
SET_LO_HI(p, v, type, blob_sdb_lo, blob_sdb_hi);
#if defined(__cplusplus)
}
#endif
#endif /* !_DB_BLOB_H_ */
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