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* doxygen comments in database.[ch]

master
Alex 'AdUser' Z 7 years ago
parent
9a96d14a6a
commit
3af7b53fe6
2 changed files with 98 additions and 49 deletions
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  1. 6
      src/database.c
  2. 141
      src/database.h

6
src/database.c
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@ -19,9 +19,9 @@
#include "bitmap.h"
struct _simdb_t {
int fd;
int flags;
char path[PATH_MAX];
int fd; /**< database file descriptor */
int flags; /**< database flags and capabilities, see SIMDB_FLAGS_* and SIMDB_CAP_* defines */
char path[PATH_MAX]; /**< path to database file */
};
#define DB_READ(db, buf, len, off) \

141
src/database.h
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@ -1,52 +1,71 @@
#ifndef HAS_DATABASE_H
#define HAS_DATABASE_H 1
#define SIMDB_REC_LEN 48
#define SIMDB_VERSION 2
/**
* @file
* @brief Exportable simdb functions, defines & structs
*/
/* runtime flags */
#define SIMDB_FLAG_WRITE 1 << (0 + 0)
#define SIMDB_VERSION 2 /**< database format version */
#define SIMDB_REC_LEN 48 /**< record length, in bytes */
/* database capabilities */
#define SIMDB_CAP_BITMAP 1 << (8 + 0)
#define SIMDB_CAP_COLORS 1 << (8 + 1)
#define SIMDB_CAP_RATIO 1 << (8 + 2)
/* 3 used, 5 reserved */
/**
* @defgroup SIMDBFlags Database runtime flags
* @{ */
#define SIMDB_FLAG_WRITE 1 << (0 + 0) /**< database has write access */
/** @} */
#define SIMDB_SUCCESS 0
/* database errors */
#define SIMDB_ERR_SYSTEM -1 /* see errno for details */
#define SIMDB_ERR_OOM -2 /* can't allocate memory */
#define SIMDB_ERR_CORRUPTDB -3 /* empty or currupted database */
#define SIMDB_ERR_WRONGVERS -4 /* database version mismatch */
#define SIMDB_ERR_NXRECORD -5 /* no such record in database */
#define SIMDB_ERR_READONLY -6 /* database opened in read-only mode */
/**
* @defgroup SIMDBCaps Database capabilities
* @{ */
#define SIMDB_CAP_BITMAP 1 << (8 + 0) /**< database can compare images by luma bitmaps */
#define SIMDB_CAP_COLORS 1 << (8 + 1) /**< database can compare images by color levels */
#define SIMDB_CAP_RATIO 1 << (8 + 2) /**< database can compare images by ratio */
/* 3 used, 5 reserved */
/** @} */
typedef struct _simdb_t simdb_t; /* opaque database type */
/**
* @defgroup SIMDBErrors Database error codes
* @{ */
#define SIMDB_SUCCESS 0 /**< success */
#define SIMDB_ERR_SYSTEM -1 /**< see errno for details */
#define SIMDB_ERR_OOM -2 /**< can't allocate memory */
#define SIMDB_ERR_CORRUPTDB -3 /**< empty or corrupted database */
#define SIMDB_ERR_WRONGVERS -4 /**< database version mismatch */
#define SIMDB_ERR_NXRECORD -5 /**< no such record in database */
#define SIMDB_ERR_READONLY -6 /**< database opened in read-only mode */
/** @} */
/** opaque database handler */
typedef struct _simdb_t simdb_t;
#define REC_OFF_RU 0 /* record is used */
#define REC_OFF_CR 1 /* color level: red */
#define REC_OFF_CG 2 /* color level: green */
#define REC_OFF_CB 3 /* color level: blue */
#define REC_OFF_IW 4 /* image width */
#define REC_OFF_IH 6 /* image height */
#define REC_OFF_BM 16 /* image bitmap */
/**
* @defgroup SIMDBRecOffsets Sample data parts offset in database record
* @{ */
#define REC_OFF_RU 0 /**< record is used */
#define REC_OFF_CR 1 /**< color level: red */
#define REC_OFF_CG 2 /**< color level: green */
#define REC_OFF_CB 3 /**< color level: blue */
#define REC_OFF_IW 4 /**< image width */
#define REC_OFF_IH 6 /**< image height */
#define REC_OFF_BM 16 /**< image bitmap */
/** @} */
/**
* block of sequental records of database
*/
typedef struct {
uint64_t start;
size_t records;
unsigned char *data;
uint64_t start; /**< first record number of block */
size_t records; /**< records count */
unsigned char *data; /**< raw records data */
} simdb_block_t;
/**
* database record
*/
typedef struct {
uint64_t num;
unsigned char data[SIMDB_REC_LEN];
uint64_t num; /**< record number in database */
unsigned char data[SIMDB_REC_LEN]; /**< record raw data */
} simdb_rec_t;
/**
@ -68,15 +87,6 @@ typedef struct {
float diff_bitmap; /**< difference of bitmap */
} simdb_match_t;
/**
* @returns 1 on success, 0 if record missing and <0 on error
*/
int simdb_read_rec (simdb_t *db, simdb_rec_t *rec);
int simdb_write_rec(simdb_t *db, simdb_rec_t *rec);
int simdb_read_blk (simdb_t *db, simdb_block_t *blk);
int simdb_write_blk(simdb_t *db, simdb_block_t *blk);
/**
* @brief Creates empty database at given path
* @param path Path to database
@ -104,12 +114,19 @@ void simdb_close(simdb_t *db);
/**
* @brief Get error desctiption by error code
* @param error Error code, see SIMDB_ERR_* defines above
* @param code Error code, see SIMDB_ERR_* defines above
*/
const char * simdb_error(int code);
/**
* @returns: >0 if found some matches, 0 if nothing found, <0 on error
* @brief Search compare given record in database to other images
* @param db Database handle
* @param sample Record sample
* @param search Search parameters
* @param matches Pointer to storage for found matches
* @retval >0 if found some matches
* @retval 0 if nothing found
* @retval <0 on error
*/
int
simdb_search(simdb_t * const db,
@ -118,7 +135,37 @@ simdb_search(simdb_t * const db,
simdb_match_t ** matches);
/**
* @returns: number of records in database
* @brief Read single record from database
* @param db Database handle
* @param rec Record struct
* @note @a num member of @a rec struct should be set
* @retval 1 on success
* @retval 0 if record exists but not used,
* @retval <0 on error (system error or record missing)
*/
int simdb_read_rec (simdb_t *db, simdb_rec_t *rec);
/**
* @brief Write single record to database
* @param db Database handle
* @param rec Record struct to write
* @note @a num member of @a rec struct should be set
* @retval 1 on success
* @retval <0 on error (system error or record missing)
*/
int simdb_write_rec(simdb_t *db, simdb_rec_t *rec);
/**
* @brief Read continious records block from database
* @param db Database handle
* @param blk Block struct
* @note @a start and @a records members of @a blk struct should be set
* @retval >=0 As number of records actually read
* @retval <0 on error
*/
int simdb_read_blk (simdb_t *db, simdb_block_t *blk);
/**
* @brief Get database capacity
*/
uint64_t
simdb_records_count(simdb_t * const db);
@ -133,12 +180,14 @@ simdb_usage_map(simdb_t * const db,
/**
* @brief Fills buffer 'map' according to records existense in given range
* @param offset start of slice position
* @param limit slice size
* @returns records processed (and also buffer size)
* @param db Database handler
* @param map Pointer for storing allocated usage map
* @param offset Start of slice position
* @param limit Slice size
* @returns Records processed (and also buffer size)
*/
uint16_t
simdb_usage_slice(simdb_t * const db,
simdb_usage_slice(simdb_t * const db,
char ** const map,
uint64_t offset,
uint16_t limit);

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