From 7a34a5bb242300d4df70e2534f20d25ec4508cc5 Mon Sep 17 00:00:00 2001
From: Heikki Levanto <heikki@indexdata.dk>
Date: Tue, 16 Jan 2001 19:05:45 +0000
Subject: [PATCH] Started to work on isamg

---
 isamg/Makefile.am |    9 ++++
 isamg/isamg.c     |  144 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 153 insertions(+)
 create mode 100644 isamg/Makefile.am
 create mode 100644 isamg/isamg.c

diff --git a/isamg/Makefile.am b/isamg/Makefile.am
new file mode 100644
index 0000000..75fe6a8
--- /dev/null
+++ b/isamg/Makefile.am
@@ -0,0 +1,9 @@
+## $Id: Makefile.am,v 1.1 2001-01-16 19:05:45 heikki Exp $
+
+noinst_LIBRARIES = libisamc.a
+
+libisamc_a_SOURCES = isamg.c 
+
+INCLUDES = -I$(srcdir)/../include @YAZINC@
+
+LDADD = ../util/libutil.a ../bfile/libbfile.a libisamc.a @YAZLIB@
diff --git a/isamg/isamg.c b/isamg/isamg.c
new file mode 100644
index 0000000..a4e13ed
--- /dev/null
+++ b/isamg/isamg.c
@@ -0,0 +1,144 @@
+/* $Id: */
+ * Copyright (c) 1995-1996, Index Data.
+ * See the file LICENSE for details.
+ *
+ * ISAM-G the general encapsulation of all our ISAM types
+ *
+ * Heikki Levanto
+ *
+ * log at the end
+ */
+
+#include <bfile.h>
+#include <isamg.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Local type declarations 
+ * Not to be used from outside this module
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+ 
+enum isam_types { 
+   isamtype_unknown=0,
+   isamtype_d=1,
+   }
+
+/* The isam type itself. File handles, statistics, block sizes */
+typedef struct ISAMG_file_s {
+    char *isam_type_name;
+    enum isam_types isam_type;
+
+    /* these might be better off as an union of different types. */
+    ISAMD isamd;
+    ISAMD_M isamd_m;
+    
+} *ISAMG_file;
+
+struct ISAMG_s {
+/*
+    int no_files;
+    ISAMG_M method;
+    ISAMG_file files;
+*/
+}; 
+
+
+typedef struct ISAMG_DIFF_s *ISAMG_DIFF;
+
+/* ISAMG position structure. Used for reading through the isam */
+struct ISAMG_PP_s {
+#ifdef SKIPTHIS
+    char *buf;   /* buffer for read/write operations */
+    ISAMG_BLOCK_SIZE offset; /* position for next read/write */
+    ISAMG_BLOCK_SIZE size;   /* size of actual data */
+    int cat;  /* category of this block */
+    int pos;  /* block number of this block */
+    int next; /* number of the next block */
+    int diffs; /* not used in the modern isam-d, but kept for stats compatibility */
+               /* never stored on disk, though */
+#endif
+    ISAMG is;  /* the isam itself */
+    void *decodeClientData;  /* delta-encoder's own data */
+#ifdef SKIPTHIS
+    ISAMG_DIFF diffinfo;
+    char *diffbuf; /* buffer for the diff block */
+    int numKeys;
+#endif
+};
+
+#ifdef SKIPTHIS
+#define ISAMG_BLOCK_OFFSET_N (sizeof(int) +  \
+                              sizeof(ISAMG_BLOCK_SIZE)) 
+/* == 8 */
+#define ISAMG_BLOCK_OFFSET_1 (sizeof(int) + \
+                              sizeof(ISAMG_BLOCK_SIZE) + \
+                              sizeof(ISAMG_BLOCK_SIZE)) 
+/* == 12  (was 16) */
+//                              sizeof(int) + 
+
+
+int isamg_alloc_block (ISAMG is, int cat);
+void isamg_release_block (ISAMG is, int cat, int pos);
+int isamg_read_block (ISAMG is, int cat, int pos, char *dst);
+int isamg_write_block (ISAMG is, int cat, int pos, char *src);
+void isamg_free_diffs(ISAMG_PP pp);
+
+int is_singleton(ISAMG_P ipos);
+void singleton_decode (int code, struct it_key *k);
+int singleton_encode(struct it_key *k);
+#endif
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Splitter functions
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+ISAMG isamg_open (BFiles bfs, int writeflag, char *isam_type_name, Res res){
+    ISAMG is;
+    is = (ISAMD) xmalloc(sizeof(*is));
+    is->isam_type_name = strdup(isam_type_name);
+    if ( (0==strcmp(isam_type_name,"d") ||
+         (0==strcmp(isam_type_name,"isam_d")) {
+        is->isam_type = isamtype_isamd;
+        is->isamd = isamd_open(bfs,FNAME_ISAMD, 
+                    writeflag, key_isamd_m (res,&isamd_m)
+    }
+    else {
+        logf (LOG_FATAL, "isamg: Unknown isam type: %s", isam_type_name);
+        exit(1);
+    }
+} /* open */
+
+int isamg_close (ISAMG is){
+    assert(is);
+    assert(is->isam_type);
+    select (is->isam_type) {
+        case isamtype_isamd: return isams_close(is->isamd);
+    }
+} /* close */
+
+
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Log
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+
+/*
+ * $Log: isamg.c,v $
+ * Revision 1.1  2001-01-16 19:05:45  heikki
+ * Started to work on isamg
+ *
+ *
+ *
+ */
\ No newline at end of file
-- 
1.7.10.4