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91 lines
2.3 KiB
91 lines
2.3 KiB
#ifndef HAS_DATABASE_H |
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#define HAS_DATABASE_H 1 |
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#define IMDB_REC_LEN 48 |
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#define IMDB_VERSION 2 |
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#define OPEN_FLAGS O_CREAT | O_RDWR |
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typedef struct { |
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int fd; |
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const char *path; |
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const char *errstr; |
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unsigned char caps[8]; |
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} imdb_t; |
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typedef struct { |
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uint64_t start; |
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size_t records; |
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unsigned char *data; |
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} block_t; |
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/** |
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Database header format - fixed length, 48 bytes |
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0-15 : "IMDB vXX, CAPS: " |
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16-23 : capabilities, terminated with ';' |
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24-48 : padding with null's |
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*/ |
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#define CAP_OFF_BITMAP 0 |
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#define CAP_OFF_COLORS 1 |
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#define CAP_OFF_RATIO 2 |
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/* 3 used, 5 reserved */ |
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/** |
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Database record format - fixed length, 48 bytes |
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# | off | len | description |
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---+-----+-----+------------------------------------------------------- |
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1 | 0 | 1 | record is used |
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2 | 1 | 1 | overall level of color: R-- |
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3 | 2 | 1 | overall level of color: -G- |
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4 | 3 | 1 | overall level of color: --B |
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5 | 4 | 2 | image width |
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6 | 6 | 2 | image height |
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- | 8 | 8 | reserved for future use |
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7 | 16 | 32 | bitmap, each 2 bytes is row of monochrome image 16x16 |
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field | 12345 6 + 7 |
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map | XRGBWWHH________MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM |
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sect | [ 0-15 ][ 16-31 ][ 32-48 ] |
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*/ |
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#define REC_OFF_RU 0 /* record is used */ |
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#define REC_OFF_CR 1 /* color level: red */ |
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#define REC_OFF_CG 2 /* color level: green */ |
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#define REC_OFF_CB 3 /* color level: blue */ |
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#define REC_OFF_IW 4 /* image width */ |
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#define REC_OFF_IH 6 /* image height */ |
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#define REC_OFF_BM 16 /* image bitmap */ |
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typedef struct { |
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uint64_t num; |
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unsigned char data[IMDB_REC_LEN]; |
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} imdb_rec_t; |
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typedef struct { |
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uint64_t num; |
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float diff; |
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} imdb_match_t; |
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extern int imdb_open (imdb_t *db, const char *path); |
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extern int imdb_close(imdb_t *db); |
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extern int imdb_read_rec (imdb_t *db, imdb_rec_t *rec); |
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extern int imdb_write_rec(imdb_t *db, imdb_rec_t *rec); |
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extern int imdb_read_blk (imdb_t *db, block_t *blk); |
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extern int imdb_write_blk(imdb_t *db, block_t *blk); |
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extern int imdb_read_list (imdb_t *db, imdb_rec_t *list, size_t list_len); |
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extern int imdb_write_list(imdb_t *db, imdb_rec_t *list, size_t list_len); |
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/** |
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@returns: |
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-1 on error |
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0 if nothing found |
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>0 if found some matches |
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*/ |
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extern int imdb_search(imdb_t *db, imdb_rec_t *sample, float tresh, imdb_match_t **matches); |
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#endif
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