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file-cache.h
#ifndef FILE_CACHE_H #define FILE_CACHE_H /* Create a new file cache. It works very much like file-backed mmap()ed memory, but it works more nicely with remote filesystems (no SIGBUS). */ struct file_cache *file_cache_new(int fd); struct file_cache *file_cache_new_path(int fd, const char *path); /* Destroy the cache and set cache pointer to NULL. */ void file_cache_free(struct file_cache **cache); /* Change cached file descriptor. Invalidates the whole cache. */ void file_cache_set_fd(struct file_cache *cache, int fd); /* Change the memory allocated for the cache. This can be used to immediately set the maximum size so there's no need to grow the memory area with possibly slow copying. */ int file_cache_set_size(struct file_cache *cache, uoff_t size); /* Read data from file, returns how many bytes was actually read or -1 if error occurred. */ ssize_t file_cache_read(struct file_cache *cache, uoff_t offset, size_t size); /* Returns pointer to beginning of cached file. Only parts of the returned memory that are valid are the ones that have been file_cache_read(). Note that the pointer may become invalid after calling file_cache_read(). */ const void *file_cache_get_map(struct file_cache *cache, size_t *size_r); /* Update cached memory area. Mark fully written pages as cached. */ void file_cache_write(struct file_cache *cache, const void *data, size_t size, uoff_t offset); /* Invalidate cached memory area. It will be read again next time it's tried to be accessed. */ void file_cache_invalidate(struct file_cache *cache, uoff_t offset, uoff_t size); #endif