CopyHFSMeta/Data.h

   1 #ifndef _DATA_H
   2 # define _DATA_H
   3
   4 /*
   5  * Data-manipulating functions and structures, used to
   6  * create the skeleton copy.
   7  */
   8 struct DeviceInfo;
   9 struct VolumeDescriptor;
  10 struct IOWrapper;
  11
  12 /*
  13  * We treat each data structure in the filesystem as
  14  * a <start, length> pair.
  15  */
  16 struct Extents {
  17         off_t base;
  18         off_t length;
  19 };
  20 typedef struct Extents Extents_t;
  21
  22 #define kExtentCount    100
  23
  24 /*
  25  * The in-core representation consists of a linked
  26  * list of an array of extents, up to 100 in each element.
  27  */
  28 struct ExtentList {
  29         size_t count;
  30         Extents_t extents[kExtentCount];
  31         struct ExtentList *next;
  32 };
  33 typedef struct ExtentList ExtentList_t;
  34
  35 /*
  36  * The in-core description of the volume:  an input source,
  37  * a description of the volume, the linked list of extents,
  38  * the total number of bytes, and the number of linked list
  39  * elements.
  40  */
  41 struct VolumeObjects {
  42         struct DeviceInfo *devp;
  43         struct VolumeDescriptor *vdp;
  44         size_t count;
  45         off_t byteCount;
  46         ExtentList_t *list;
  47 };
  48 typedef struct VolumeObjects VolumeObjects_t;
  49
  50 extern VolumeObjects_t *InitVolumeObject(struct DeviceInfo *devp, struct VolumeDescriptor *vdp);
  51 extern int AddExtent(VolumeObjects_t *vop, off_t start, off_t length);
  52 extern void PrintVolumeObject(VolumeObjects_t*);
  53 extern int CopyObjectsToDest(VolumeObjects_t*, struct IOWrapper *wrapper, off_t skip);
  54
  55 extern void WriteGatheredData(const char *, VolumeObjects_t*);
  56
  57 #endif /* _DATA_H */