X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs2.git;a=blobdiff_plain;f=yaffs_packedtags2.c;h=c6f7dcf3365035368a7c9b077ed0ede7ebb5a2db;hp=5cc68af9e7f3be9eb277ba981d44487c513fe1e1;hb=06f8628f9290bd967b8374c992a11dd06caa8747;hpb=84699e12e914cb78ae3a1da48c99ed679b934153

diff --git a/yaffs_packedtags2.c b/yaffs_packedtags2.c
index 5cc68af..c6f7dcf 100644
--- a/yaffs_packedtags2.c
+++ b/yaffs_packedtags2.c
@@ -1,20 +1,19 @@
 /*
- * YAFFS: Yet another FFS. A NAND-flash specific file system. 
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * yaffs_packedtags2.c: Tags packing for YAFFS2
- *
- * Copyright (C) 2002 Aleph One Ltd.
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
  *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public License
- * version 2.1 as published by the Free Software Foundation.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
  */
 
 #include "yaffs_packedtags2.h"
 #include "yportenv.h"
+#include "yaffs_trace.h"
 #include "yaffs_tagsvalidity.h"
 
 /* This code packs a set of extended tags into a binary structure for
@@ -39,132 +38,161 @@
 #define EXTRA_OBJECT_TYPE_SHIFT (28)
 #define EXTRA_OBJECT_TYPE_MASK  ((0x0F) << EXTRA_OBJECT_TYPE_SHIFT)
 
-static void yaffs_DumpPackedTags2(const yaffs_PackedTags2 * pt)
+
+static void yaffs_DumpPackedTags2TagsPart(const yaffs_PackedTags2TagsPart *ptt)
 {
 	T(YAFFS_TRACE_MTD,
 	  (TSTR("packed tags obj %d chunk %d byte %d seq %d" TENDSTR),
-	   pt->t.objectId, pt->t.chunkId, pt->t.byteCount,
-	   pt->t.sequenceNumber));
+	   ptt->objectId, ptt->chunkId, ptt->byteCount,
+	   ptt->sequenceNumber));
+}
+static void yaffs_DumpPackedTags2(const yaffs_PackedTags2 *pt)
+{
+	yaffs_DumpPackedTags2TagsPart(&pt->t);
 }
 
-static void yaffs_DumpTags2(const yaffs_ExtendedTags * t)
+static void yaffs_DumpTags2(const yaffs_ExtendedTags *t)
 {
 	T(YAFFS_TRACE_MTD,
 	  (TSTR
-	   ("ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte "
-	    "%d del %d ser %d seq %d"
+	   ("ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte %d del %d ser %d seq %d"
 	    TENDSTR), t->eccResult, t->blockBad, t->chunkUsed, t->objectId,
 	   t->chunkId, t->byteCount, t->chunkDeleted, t->serialNumber,
 	   t->sequenceNumber));
 
 }
 
-void yaffs_PackTags2(yaffs_PackedTags2 * pt, const yaffs_ExtendedTags * t)
+void yaffs_PackTags2TagsPart(yaffs_PackedTags2TagsPart *ptt,
+		const yaffs_ExtendedTags *t)
 {
-	pt->t.chunkId = t->chunkId;
-	pt->t.sequenceNumber = t->sequenceNumber;
-	pt->t.byteCount = t->byteCount;
-	pt->t.objectId = t->objectId;
+	ptt->chunkId = t->chunkId;
+	ptt->sequenceNumber = t->sequenceNumber;
+	ptt->byteCount = t->byteCount;
+	ptt->objectId = t->objectId;
 
 	if (t->chunkId == 0 && t->extraHeaderInfoAvailable) {
 		/* Store the extra header info instead */
 		/* We save the parent object in the chunkId */
-		pt->t.chunkId = EXTRA_HEADER_INFO_FLAG
+		ptt->chunkId = EXTRA_HEADER_INFO_FLAG
 			| t->extraParentObjectId;
-		if (t->extraIsShrinkHeader) {
-			pt->t.chunkId |= EXTRA_SHRINK_FLAG;
-		}
-		if (t->extraShadows) {
-			pt->t.chunkId |= EXTRA_SHADOWS_FLAG;
-		}
+		if (t->extraIsShrinkHeader)
+			ptt->chunkId |= EXTRA_SHRINK_FLAG;
+		if (t->extraShadows)
+			ptt->chunkId |= EXTRA_SHADOWS_FLAG;
 
-		pt->t.objectId &= ~EXTRA_OBJECT_TYPE_MASK;
-		pt->t.objectId |=
+		ptt->objectId &= ~EXTRA_OBJECT_TYPE_MASK;
+		ptt->objectId |=
 		    (t->extraObjectType << EXTRA_OBJECT_TYPE_SHIFT);
 
-		if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK) {
-			pt->t.byteCount = t->extraEquivalentObjectId;
-		} else if (t->extraObjectType == YAFFS_OBJECT_TYPE_FILE) {
-			pt->t.byteCount = t->extraFileLength;
-		} else {
-			pt->t.byteCount = 0;
-		}
+		if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK)
+			ptt->byteCount = t->extraEquivalentObjectId;
+		else if (t->extraObjectType == YAFFS_OBJECT_TYPE_FILE)
+			ptt->byteCount = t->extraFileLength;
+		else
+			ptt->byteCount = 0;
 	}
 
-	yaffs_DumpPackedTags2(pt);
+	yaffs_DumpPackedTags2TagsPart(ptt);
 	yaffs_DumpTags2(t);
+}
+
+
+void yaffs_PackTags2(yaffs_PackedTags2 *pt, const yaffs_ExtendedTags *t, int tagsECC)
+{
+	yaffs_PackTags2TagsPart(&pt->t, t);
 
-#ifndef YAFFS_IGNORE_TAGS_ECC
-	{
+	if(tagsECC)
 		yaffs_ECCCalculateOther((unsigned char *)&pt->t,
 					sizeof(yaffs_PackedTags2TagsPart),
 					&pt->ecc);
-	}
-#endif
 }
 
-void yaffs_UnpackTags2(yaffs_ExtendedTags * t, yaffs_PackedTags2 * pt)
+
+void yaffs_UnpackTags2TagsPart(yaffs_ExtendedTags *t,
+		yaffs_PackedTags2TagsPart *ptt)
 {
 
 	memset(t, 0, sizeof(yaffs_ExtendedTags));
 
 	yaffs_InitialiseTags(t);
 
-	if (pt->t.sequenceNumber != 0xFFFFFFFF) {
-		/* Page is in use */
-#ifdef YAFFS_IGNORE_TAGS_ECC
-		{
-			t->eccResult = 0;
-		}
-#else
-		{
-			yaffs_ECCOther ecc;
-			yaffs_ECCCalculateOther((unsigned char *)&pt->t,
-						sizeof
-						(yaffs_PackedTags2TagsPart),
-						&ecc);
-			t->eccResult =
-			    yaffs_ECCCorrectOther((unsigned char *)&pt->t,
-						  sizeof
-						  (yaffs_PackedTags2TagsPart),
-						  &pt->ecc, &ecc);
-		}
-#endif
+	if (ptt->sequenceNumber != 0xFFFFFFFF) {
 		t->blockBad = 0;
 		t->chunkUsed = 1;
-		t->objectId = pt->t.objectId;
-		t->chunkId = pt->t.chunkId;
-		t->byteCount = pt->t.byteCount;
+		t->objectId = ptt->objectId;
+		t->chunkId = ptt->chunkId;
+		t->byteCount = ptt->byteCount;
 		t->chunkDeleted = 0;
 		t->serialNumber = 0;
-		t->sequenceNumber = pt->t.sequenceNumber;
+		t->sequenceNumber = ptt->sequenceNumber;
 
 		/* Do extra header info stuff */
 
-		if (pt->t.chunkId & EXTRA_HEADER_INFO_FLAG) {
+		if (ptt->chunkId & EXTRA_HEADER_INFO_FLAG) {
 			t->chunkId = 0;
 			t->byteCount = 0;
 
 			t->extraHeaderInfoAvailable = 1;
 			t->extraParentObjectId =
-			    pt->t.chunkId & (~(ALL_EXTRA_FLAGS));
+			    ptt->chunkId & (~(ALL_EXTRA_FLAGS));
 			t->extraIsShrinkHeader =
-			    (pt->t.chunkId & EXTRA_SHRINK_FLAG) ? 1 : 0;
+			    (ptt->chunkId & EXTRA_SHRINK_FLAG) ? 1 : 0;
 			t->extraShadows =
-			    (pt->t.chunkId & EXTRA_SHADOWS_FLAG) ? 1 : 0;
+			    (ptt->chunkId & EXTRA_SHADOWS_FLAG) ? 1 : 0;
 			t->extraObjectType =
-			    pt->t.objectId >> EXTRA_OBJECT_TYPE_SHIFT;
+			    ptt->objectId >> EXTRA_OBJECT_TYPE_SHIFT;
 			t->objectId &= ~EXTRA_OBJECT_TYPE_MASK;
 
-			if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK) {
-				t->extraEquivalentObjectId = pt->t.byteCount;
-			} else {
-				t->extraFileLength = pt->t.byteCount;
-			}
+			if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK)
+				t->extraEquivalentObjectId = ptt->byteCount;
+			else
+				t->extraFileLength = ptt->byteCount;
 		}
 	}
 
-	yaffs_DumpPackedTags2(pt);
+	yaffs_DumpPackedTags2TagsPart(ptt);
 	yaffs_DumpTags2(t);
 
 }
+
+
+void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt, int tagsECC)
+{
+
+	yaffs_ECCResult eccResult = YAFFS_ECC_RESULT_NO_ERROR;
+
+	if (pt->t.sequenceNumber != 0xFFFFFFFF &&
+	    tagsECC){
+		/* Chunk is in use and we need to do ECC */
+		
+		yaffs_ECCOther ecc;
+		int result;
+		yaffs_ECCCalculateOther((unsigned char *)&pt->t,
+					sizeof(yaffs_PackedTags2TagsPart),
+					&ecc);
+		result = yaffs_ECCCorrectOther((unsigned char *)&pt->t,
+						sizeof(yaffs_PackedTags2TagsPart),
+						&pt->ecc, &ecc);
+		switch (result) {
+			case 0:
+				eccResult = YAFFS_ECC_RESULT_NO_ERROR;
+				break;
+			case 1:
+				eccResult = YAFFS_ECC_RESULT_FIXED;
+				break;
+			case -1:
+				eccResult = YAFFS_ECC_RESULT_UNFIXED;
+				break;
+			default:
+				eccResult = YAFFS_ECC_RESULT_UNKNOWN;
+		}
+	}
+
+	yaffs_UnpackTags2TagsPart(t, &pt->t);
+
+	t->eccResult = eccResult;
+
+	yaffs_DumpPackedTags2(pt);
+	yaffs_DumpTags2(t);
+}
+