isamd write and read functions ok, except when diff block full.

[idzebra-moved-to-github.git] / isamc / isamd-p.h

diff --git a/isamc/isamd-p.h b/isamc/isamd-p.h
index 81d1530..22859e2 100644 (file)
--- a/isamc/isamd-p.h
+++ b/isamc/isamd-p.h
@@ -3,7 +3,7 @@
  * See the file LICENSE for details.
  * Heikki Levanto
  *
- *
+ * log at the end
  */
 
 #include <bfile.h>
@@ -25,7 +25,7 @@ typedef struct ISAMD_file_s {
     BFile bf;
     int head_is_dirty;
     
-    int no_writes;
+    int no_writes;  /* statistics, to be used properly... */
     int no_reads;
     int no_skip_writes;
     int no_allocated;
@@ -39,7 +39,7 @@ typedef struct ISAMD_file_s {
     int no_next;
     int no_prev;
 
-    char *alloc_buf;
+    char *alloc_buf;    /* free-list handling (?) */
     int alloc_entries_num;
     int alloc_entries_max;
 
@@ -50,25 +50,26 @@ typedef struct ISAMD_file_s {
 struct ISAMD_s {
     int no_files;
     int max_cat;
-  //  char *merge_buf;
-    char *startblock; /* start of the chain, update lastptr and numKeys here */
-    char *lastblock;  /* end of the chain, append here */
     ISAMD_M method;
     ISAMD_file files;
 }; 
 
+
+typedef struct ISAMD_DIFF_s *ISAMD_DIFF;
+
 struct ISAMD_PP_s {
-    char *buf;
-    ISAMD_BLOCK_SIZE offset;
-    ISAMD_BLOCK_SIZE size;
+    char *buf;   /* buffer for read/write operations */
+    ISAMD_BLOCK_SIZE offset; /* position for next read/write */
+    ISAMD_BLOCK_SIZE size;   /* size of actual pointer data */
     int cat;  /* category of this block */
     int pos;  /* block number of this block */
     int next; /* number of the next block */
+    int diffs; /* either block or offset (in head) of start of diffs */
     ISAMD is;
     void *decodeClientData;
-    int deleteFlag;
+    ISAMD_DIFF diffinfo;
+    char *diffbuf; /* buffer for the diff block, only when reading */
     int numKeys;
-    ISAMD_BLOCK_SIZE lastblock;  /* last block in chain */
 };
 
 #define ISAMD_BLOCK_OFFSET_N (sizeof(int) +  \
@@ -79,10 +80,13 @@ struct ISAMD_PP_s {
                               sizeof(int) + \
                               sizeof(ISAMD_BLOCK_SIZE)) 
 /* == 16 */
+
+
 int isamd_alloc_block (ISAMD is, int cat);
 void isamd_release_block (ISAMD is, int cat, int pos);
 int isamd_read_block (ISAMD is, int cat, int pos, char *dst);
 int isamd_write_block (ISAMD is, int cat, int pos, char *src);
+void isamd_free_diffs(ISAMD_PP pp);
 
 #ifdef __cplusplus
 }
@@ -92,8 +96,12 @@ int isamd_write_block (ISAMD is, int cat, int pos, char *src);
 
 /*
  * $Log: isamd-p.h,v $
- * Revision 1.2  1999-07-14 13:21:34  heikki
- * Added isam-d files. Compiles (almost) clean. Doesn't work at all
+ * Revision 1.4  1999-07-21 14:24:50  heikki
+ * isamd write and read functions ok, except when diff block full.
+ * (merge not yet done)
+ *
+ * Revision 1.3  1999/07/14 15:05:30  heikki
+ * slow start on isam-d
  *
  * Revision 1.1  1999/07/14 12:34:43  heikki
  * Copied from isamh, starting to change things...