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Commit	Line	Data
a56bdb9d A	1	#ifndef _DATA_H
	2	# define _DATA_H
	3
41dcebd9 A	4	# include <errno.h>
	5	/*
	6	* Exit status values. We use some errno values because
	7	* they are convenient.
	8	* kGoodExit: we finished copying, and no problems.
	9	* kNoSpaceExit: Not enough space for the skeleton copy.
	10	* kCopyIOExit: An I/O error occurred. This may not be fatal,
	11	* as it may just mean the source device went away. We
	12	* can continue later, perhaps.
	13	* kIntrExit: The copying was interrupted. As above, this may
	14	* not be fatal.
	15	* kBadExit: Any other problem.
	16	*/
	17	enum {
	18	kGoodExit = 0,
	19	kNoSpaceExit = ENOSPC,
	20	kCopyIOExit = EIO,
	21	kIntrExit = EINTR,
	22	kBadExit = 1,
	23	};
	24
a56bdb9d A	25	/*
	26	* Data-manipulating functions and structures, used to
	27	* create the skeleton copy.
	28	*/
	29	struct DeviceInfo;
	30	struct VolumeDescriptor;
	31	struct IOWrapper;
	32
	33	/*
	34	* We treat each data structure in the filesystem as
	35	* a <start, length> pair.
	36	*/
	37	struct Extents {
	38	off_t base;
	39	off_t length;
41dcebd9	40	unsigned int fid; // Optional, may not be set
a56bdb9d A	41	};
	42	typedef struct Extents Extents_t;
	43
	44	#define kExtentCount 100
	45
	46	/*
	47	* The in-core representation consists of a linked
	48	* list of an array of extents, up to 100 in each element.
	49	*/
	50	struct ExtentList {
	51	size_t count;
	52	Extents_t extents[kExtentCount];
	53	struct ExtentList *next;
	54	};
	55	typedef struct ExtentList ExtentList_t;
a56bdb9d A	56	/*
	57	* The in-core description of the volume: an input source,
	58	* a description of the volume, the linked list of extents,
	59	* the total number of bytes, and the number of linked list
	60	* elements.
	61	*/
	62	struct VolumeObjects {
	63	struct DeviceInfo *devp;
	64	struct VolumeDescriptor *vdp;
	65	size_t count;
	66	off_t byteCount;
	67	ExtentList_t *list;
	68	};
	69	typedef struct VolumeObjects VolumeObjects_t;
	70
41dcebd9 A	71	typedef int (^extent_handler_t)(int fid, off_t start, off_t len);
41dcebd9 A	72
a56bdb9d A	73	extern VolumeObjects_t InitVolumeObject(struct DeviceInfo devp, struct VolumeDescriptor *vdp);
a56bdb9d A	74	extern int AddExtent(VolumeObjects_t *vop, off_t start, off_t length);
41dcebd9	75	extern int AddExtentForFile(VolumeObjects_t *vop, off_t start, off_t length, unsigned int fid);
a56bdb9d A	76	extern void PrintVolumeObject(VolumeObjects_t*);
	77	extern int CopyObjectsToDest(VolumeObjects_t, struct IOWrapper wrapper, off_t skip);
	78
	79	extern void WriteGatheredData(const char , VolumeObjects_t);
	80
41dcebd9 A	81	extern struct DeviceInfo OpenDevice(const char , int);
	82	extern struct VolumeDescriptor VolumeInfo(struct DeviceInfo );
	83	extern int AddHeaders(VolumeObjects_t *, int);
	84	extern void AddJournal(VolumeObjects_t *);
	85	extern void AddFileExtents(VolumeObjects_t *);
	86	extern int FindOtherMetadata(VolumeObjects_t *, extent_handler_t);
	87	extern int CompareVolumeHeaders(struct VolumeDescriptor*);
	88
	89	void ReleaseDeviceInfo(struct DeviceInfo *);
	90	void ReleaseVolumeDescriptor(struct VolumeDescriptor*);
	91	void ReleaseVolumeObjects(VolumeObjects_t *);
a56bdb9d	92	#endif /* _DATA_H */