Work on flat shadow (not finished yet).

[idzebra-moved-to-github.git] / bfile / cfile.c

diff --git a/bfile/cfile.c b/bfile/cfile.c
index cfcd6da..bacbe83 100644 (file)
--- a/bfile/cfile.c
+++ b/bfile/cfile.c
@@ -4,7 +4,24 @@
  * Sebastian Hammer, Adam Dickmeiss
  *
  * $Log: cfile.c,v $
- * Revision 1.4  1995-12-01 16:24:28  adam
+ * Revision 1.9  1996-02-07 10:08:43  adam
+ * Work on flat shadow (not finished yet).
+ *
+ * Revision 1.8  1995/12/15  12:36:52  adam
+ * Moved hash file information to union.
+ * Renamed commit files.
+ *
+ * Revision 1.7  1995/12/15  10:35:07  adam
+ * Changed names of commit files.
+ *
+ * Revision 1.6  1995/12/11  09:03:53  adam
+ * New function: cf_unlink.
+ * New member of commit file head: state (0) deleted, (1) hash file.
+ *
+ * Revision 1.5  1995/12/08  16:21:14  adam
+ * Work on commit/update.
+ *
+ * Revision 1.4  1995/12/01  16:24:28  adam
  * Commit files use separate meta file area.
  *
  * Revision 1.3  1995/12/01  11:37:22  adam
@@ -64,27 +81,30 @@ static int read_head (CFile cf)
 CFile cf_open (MFile mf, MFile_area area, const char *fname,
                int block_size, int wflag, int *firstp)
 {
-    char path[256];
+    char path[1024];
     int i;
     CFile cf = xmalloc (sizeof(*cf));
     int hash_bytes;
    
     cf->rmf = mf; 
-    sprintf (path, "%s.b", fname);
+    sprintf (path, "%s-b", fname);
     if (!(cf->block_mf = mf_open (area, path, block_size, wflag)))
     {
         logf (LOG_FATAL|LOG_ERRNO, "Failed to open %s", path);
         exit (1);
     }
-    sprintf (path, "%s.h", fname);
+    sprintf (path, "%s-i", fname);
     if (!(cf->hash_mf = mf_open (area, path, HASH_BSIZE, wflag)))
     {
         logf (LOG_FATAL|LOG_ERRNO, "Failed to open %s", path);
         exit (1);
     }
-    if (!mf_read (cf->hash_mf, 0, 0, sizeof(cf->head), &cf->head))
+    assert (firstp);
+    if (!mf_read (cf->hash_mf, 0, 0, sizeof(cf->head), &cf->head) ||
+        !cf->head.state)
     {
         *firstp = 1;
+        cf->head.state = 1;
         cf->head.block_size = block_size;
         cf->head.hash_size = 401;
         hash_bytes = cf->head.hash_size * sizeof(int);
@@ -103,7 +123,7 @@ CFile cf_open (MFile mf, MFile_area area, const char *fname,
     {
         *firstp = 0;
         assert (cf->head.block_size == block_size);
-        assert (cf->head.hash_size > 2 && cf->head.hash_size < 200000);
+        assert (cf->head.hash_size > 2);
         hash_bytes = cf->head.hash_size * sizeof(int);
         assert (cf->head.next_bucket > 0);
         cf->array = xmalloc (hash_bytes);
@@ -225,7 +245,17 @@ static struct CFile_hash_bucket *new_bucket (CFile cf, int *block_no, int hno)
     return p;
 }
 
-int cf_lookup (CFile cf, int no)
+static int cf_lookup_flat (CFile cf, int no)
+{
+    int hno = (no*sizeof(int))/HASH_BSIZE;
+    int off = (no*sizeof(int)) - hno*sizeof(HASH_BSIZE);
+    int vno = 0;
+
+    mf_read (cf->hash_mf, hno+cf->head.next_bucket, off, sizeof(int), &vno);
+    return vno;
+}
+
+static int cf_lookup_hash (CFile cf, int no)
 {
     int hno = cf_hash (cf, no);
     struct CFile_hash_bucket *hb;
@@ -254,14 +284,30 @@ int cf_lookup (CFile cf, int no)
     return 0;
 }
 
-int cf_new (CFile cf, int no)
+static int cf_lookup (CFile cf, int no)
+{
+    if (cf->head.state > 1)
+        return cf_lookup_flat (cf, no);
+    return cf_lookup_hash (cf, no);
+}
+
+int cf_new_flat (CFile cf, int no)
+{
+    int hno = (no*sizeof(int))/HASH_BSIZE;
+    int off = (no*sizeof(int)) - hno*sizeof(HASH_BSIZE);
+    int vno = (cf->head.next_block)++;
+
+    mf_write (cf->hash_mf, hno+cf->head.next_bucket, off, sizeof(int), &vno);
+    return vno;
+}
+
+static int cf_new_hash (CFile cf, int no)
 {
     int hno = cf_hash (cf, no);
     struct CFile_hash_bucket *hbprev = NULL, *hb = cf->parray[hno];
-    int *bucketpp = &cf->array[hno];
-    int i;
-    int vno = (cf->head.next_block)++;
-    
+    int *bucketpp = &cf->array[hno]; 
+    int i, vno = (cf->head.next_block)++;
+  
     for (hb = cf->parray[hno]; hb; hb = hb->h_next)
         if (!hb->ph.vno[HASH_BUCKET-1])
             for (i = 0; i<HASH_BUCKET; i++)
@@ -305,6 +351,14 @@ int cf_new (CFile cf, int no)
     return vno;
 }
 
+int cf_new (CFile cf, int no)
+{
+    if (cf->head.state > 1)
+        return cf_new_flat (cf, no);
+    return cf_new_hash (cf, no);
+}
+
+
 int cf_read (CFile cf, int no, int offset, int num, void *buf)
 {
     int block;