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Diffstat (limited to 'src/dbinc/blob.h')
| -rw-r--r-- | src/dbinc/blob.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/src/dbinc/blob.h b/src/dbinc/blob.h new file mode 100644 index 00000000..f4ff475b --- /dev/null +++ b/src/dbinc/blob.h @@ -0,0 +1,103 @@ +/*- + * 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_ */ |