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32 lines
1.3 KiB
32 lines
1.3 KiB
#ifndef __KERN_FS_SFS_BITMAP_H__
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#define __KERN_FS_SFS_BITMAP_H__
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#include <defs.h>
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/*
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* Fixed-size array of bits. (Intended for storage management.)
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*
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* Functions:
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* bitmap_create - allocate a new bitmap object.
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* Returns NULL on error.
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* bitmap_getdata - return pointer to raw bit data (for I/O).
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* bitmap_alloc - locate a cleared bit, set it, and return its index.
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* bitmap_mark - set a clear bit by its index.
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* bitmap_unmark - clear a set bit by its index.
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* bitmap_isset - return whether a particular bit is set or not.
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* bitmap_destroy - destroy bitmap.
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*/
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struct bitmap;
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struct bitmap *bitmap_create(uint32_t nbits); // allocate a new bitmap object.
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int bitmap_alloc(struct bitmap *bitmap, uint32_t *index_store); // locate a cleared bit, set it, and return its index.
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bool bitmap_test(struct bitmap *bitmap, uint32_t index); // return whether a particular bit is set or not.
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void bitmap_free(struct bitmap *bitmap, uint32_t index); // according index, set related bit to 1
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void bitmap_destroy(struct bitmap *bitmap); // free memory contains bitmap
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void *bitmap_getdata(struct bitmap *bitmap, size_t *len_store); // return pointer to raw bit data (for I/O)
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#endif /* !__KERN_FS_SFS_BITMAP_H__ */
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