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Camel Reference Manual | ![]() |
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Top | Description |
typedef camel_block_t; typedef camel_key_t; CamelBlockRoot; CamelBlock; CamelBlockFile; #define CAMEL_BLOCK_FILE_SYNC #define CAMEL_BLOCK_SIZE #define CAMEL_BLOCK_SIZE_BITS #define CAMEL_BLOCK_DIRTY #define CAMEL_BLOCK_DETACHED CamelBlockFile * camel_block_file_new (const char *path, int flags, const char version[8], size_t block_size); int camel_block_file_rename (CamelBlockFile *bs, const char *path); int camel_block_file_delete (CamelBlockFile *kf); CamelBlock * camel_block_file_new_block (CamelBlockFile *bs); int camel_block_file_free_block (CamelBlockFile *bs, camel_block_t id); CamelBlock * camel_block_file_get_block (CamelBlockFile *bs, camel_block_t id); void camel_block_file_detach_block (CamelBlockFile *bs, CamelBlock *bl); void camel_block_file_attach_block (CamelBlockFile *bs, CamelBlock *bl); void camel_block_file_touch_block (CamelBlockFile *bs, CamelBlock *bl); void camel_block_file_unref_block (CamelBlockFile *bs, CamelBlock *bl); int camel_block_file_sync_block (CamelBlockFile *bs, CamelBlock *bl); int camel_block_file_sync (CamelBlockFile *bs); CamelKeyFile; CamelKeyFile * camel_key_file_new (const char *path, int flags, const char version[8]); int camel_key_file_rename (CamelKeyFile *kf, const char *path); int camel_key_file_delete (CamelKeyFile *kf); int camel_key_file_write (CamelKeyFile *kf, camel_block_t *parent, size_t len, camel_key_t *records); int camel_key_file_read (CamelKeyFile *kf, camel_block_t *start, size_t *len, camel_key_t **records);
typedef guint32 camel_block_t; /* block offset, absolute, bottom BLOCK_SIZE_BITS always 0 */
typedef struct { char version[8]; /* version number */ guint32 flags; /* flags for file */ guint32 block_size; /* block size of this file */ camel_block_t free; /* free block list */ camel_block_t last; /* pointer to end of blocks */ /* subclasses tack on, but no more than CAMEL_BLOCK_SIZE! */ } CamelBlockRoot;
typedef struct { struct _CamelBlock *next; struct _CamelBlock *prev; camel_block_t id; guint32 flags; guint32 refcount; guint32 align00; unsigned char data[CAMEL_BLOCK_SIZE]; } CamelBlock;
typedef struct { CamelObject parent; struct _CamelBlockFilePrivate *priv; char version[8]; char *path; int flags; int fd; size_t block_size; CamelBlockRoot *root; CamelBlock *root_block; /* make private? */ int block_cache_limit; int block_cache_count; CamelDList block_cache; GHashTable *blocks; } CamelBlockFile;
CamelBlockFile * camel_block_file_new (const char *path, int flags, const char version[8], size_t block_size);
Allocate a new block file, stored at path
. version
contains an 8 character
version string which must match the head of the file, or the file will be
intitialised.
block_size
is currently ignored and is set to CAMEL_BLOCK_SIZE.
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The new block file, or NULL if it could not be created. |
int camel_block_file_rename (CamelBlockFile *bs, const char *path);
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CamelBlock * camel_block_file_new_block (CamelBlockFile *bs);
Allocate a new block, return a pointer to it. Old blocks may be flushed to disk during this call.
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Returns : |
The block, or NULL if an error occured. |
int camel_block_file_free_block (CamelBlockFile *bs, camel_block_t id);
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CamelBlock * camel_block_file_get_block (CamelBlockFile *bs, camel_block_t id);
Retreive a block id
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Returns : |
The block, or NULL if blockid is invalid or a file error occured. |
void camel_block_file_detach_block (CamelBlockFile *bs, CamelBlock *bl);
Detatch a block from the block file's cache. The block should be unref'd or attached when finished with. The block file will perform no writes of this block or flushing of it if the cache fills.
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void camel_block_file_attach_block (CamelBlockFile *bs, CamelBlock *bl);
Reattach a block that has been detached.
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void camel_block_file_touch_block (CamelBlockFile *bs, CamelBlock *bl);
Mark a block as dirty. The block will be written to disk if it ever expires from the cache.
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void camel_block_file_unref_block (CamelBlockFile *bs, CamelBlock *bl);
Mark a block as unused. If a block is used it will not be written to disk, or flushed from memory.
If a block is detatched and this is the last reference, the block will be freed.
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int camel_block_file_sync_block (CamelBlockFile *bs, CamelBlock *bl);
Flush a block to disk immediately. The block will only be flushed to disk if it is marked as dirty (touched).
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-1 on io error. |
int camel_block_file_sync (CamelBlockFile *bs);
Sync all dirty blocks to disk, including the root block.
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Returns : |
-1 on io error. |
typedef struct { CamelObject parent; struct _CamelKeyFilePrivate *priv; FILE *fp; char *path; int flags; off_t last; } CamelKeyFile;
CamelKeyFile * camel_key_file_new (const char *path, int flags, const char version[8]);
Create a new key file. A linked list of record blocks.
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open flags |
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Version string (header) of file. Currently written but not checked. |
Returns : |
A new key file, or NULL if the file could not be opened/created/initialised. |
int camel_key_file_rename (CamelKeyFile *kf, const char *path);
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int camel_key_file_write (CamelKeyFile *kf, camel_block_t *parent, size_t len, camel_key_t *records);
Write a new list of records to the key file.
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Returns : |
-1 on io error. The key file will remain unchanged. |
int camel_key_file_read (CamelKeyFile *kf, camel_block_t *start, size_t *len, camel_key_t **records);
Read the next block of data from the key file. Returns the number of records.
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The record pointer. This will be set to the next record pointer on success. |
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Number of records read, if != NULL. |
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Records, allocated, must be freed with g_free, if != NULL. |
Returns : |
-1 on io error. |