hfscommon/BTree/BTree.c

60 	   <MOSXS>	03/23/98	djb		In BTOpenPath use kTrashBlock option when releasing the header so
124 		<18>	 7/22/94	wjk		Convert to the new set of header files.
157  * The amount that the BTree header leaf count can be wrong before we assume
190 	BTHeaderRec				*header;
257 		Panic("BTOpen: getNodeProc returned error getting header node.");
261 	header = (BTHeaderRec*) ((uintptr_t)nodeRec.buffer + sizeof(BTNodeDescriptor));
264 	///////////////////////////// verify header /////////////////////////////////
266 	err = VerifyHeader (filePtr, header);
270 	///////////////////// Initalize fields from header //////////////////////////
272     PanicIf ( (FCBTOVCB(filePtr)->vcbSigWord != 0x4244) && (header->nodeSize == 512), " BTOpenPath: wrong node size for HFS+ volume!");	// 0x4244 = 'BD'
274 	btreePtr->treeDepth			= header->treeDepth;
275 	btreePtr->rootNode			= header->rootNode;
276 	btreePtr->leafRecords		= header->leafRecords;
277 	btreePtr->firstLeafNode		= header->firstLeafNode;
278 	btreePtr->lastLeafNode		= header->lastLeafNode;
279 	btreePtr->nodeSize			= header->nodeSize;
280 	btreePtr->maxKeyLength		= header->maxKeyLength;
281 	btreePtr->totalNodes		= header->totalNodes;
282 	btreePtr->freeNodes			= header->freeNodes;
284 		filePtr->ff_clumpsize = header->clumpSize;
285 	btreePtr->btreeType			= header->btreeType;
287 	btreePtr->keyCompareType = header->keyCompareType;
289 	btreePtr->attributes		= header->attributes;
384 Function:	Flush the BTreeControlBlock fields to header node, and delete BTree control
878 		 * process more leaf records, than can possibly be (or the BTree header
1842 Function:	Reload B-tree header data from disk.  This is called after fsck
1847 Input:		filePtr - the B*Tree file that needs its header updated
1861 	BTHeaderRec *header;
1877 	header = (BTHeaderRec*)((char *)node.buffer + sizeof(BTNodeDescriptor));
1878 	if ((err = VerifyHeader (filePtr, header)) == 0) {
1879 		btreePtr->treeDepth     = header->treeDepth;
1880 		btreePtr->rootNode      = header->rootNode;
1881 		btreePtr->leafRecords   = header->leafRecords;
1882 		btreePtr->firstLeafNode = header->firstLeafNode;
1883 		btreePtr->lastLeafNode  = header->lastLeafNode;
1884 		btreePtr->maxKeyLength  = header->maxKeyLength;
1885 		btreePtr->totalNodes    = header->totalNodes;
1886 		btreePtr->freeNodes     = header->freeNodes;
1887 		btreePtr->btreeType     = header->btreeType;
1929 Function:	Returns the last time that this btree was flushed, does not include header.
1967 Function:	Sets the last time that this btree was flushed, does not include header.
2021 Function:	Read the user data area of the b-tree header node.
2059 Function:	Write the user data area of the b-tree header node.