Not functional yet

[idzebra-moved-to-github.git] / include / isam.h

diff --git a/include/isam.h b/include/isam.h
new file mode 100644 (file)
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+++ b/include/isam.h
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 1994, Index Data I/S 
+ * All rights reserved.
+ * Sebastian Hammer, Adam Dickmeiss
+ *
+ * $Log: isam.h,v $
+ * Revision 1.1  1994-09-12 08:02:07  quinn
+ * Not functional yet
+ *
+ */
+
+#ifndef ISAM_H
+#define ISAM_H
+
+#include <bfile.h>
+#include <isam.h>
+
+#define IS_MAX_BLOCKTYPES 4
+
+typedef unsigned int SYSNO; /* should be somewhere else */
+typedef unsigned int ISAM_P;
+
+/*
+ * Description of a blocktype (part of an isam file)
+ */
+typedef struct isam_blocktype
+{
+    BFile bf;                    /* blocked file */
+    int blocksize;
+    int max_keys_block;          /* max num of keys per block */
+    int nice_keys_block;         /* nice number of keys per block */
+    int max_keys;                /* max number of keys per table */
+} isam_blocktype;
+
+/*
+ * Handle to an open isam complex.
+ */
+typedef struct isam_struct
+{
+    isam_blocktype types[IS_MAX_BLOCKTYPES]; /* block_types used in this file */
+    int num_types;                /* number of block types used */
+    int writeflag;
+    int keysize;                  /* size of the keys (records) used */
+    int (*cmp)(const void *k1, const void *k2); /* compare function */
+} isam_struct, *ISAM;
+
+typedef struct ispt_struct
+{
+    ISAM is;                       /* which file do we belong to? */
+    int ptr;                       /* current key offset */
+
+    struct ispt_struct *next;      /* freelist */
+} ispt_struct, *ISPT; 
+
+#define IS_TYPE(x) ((x) & 3))      /* type part of position */
+#define IS_BLOCK(x) ((x >> 2))     /* block # part of position */
+
+/*
+ * Public Prototypes.
+ *******************************************************************
+ */
+
+/*
+ * Open isam file.
+ */
+ISAM is_open(const char *name, int writeflag);
+
+/*
+ * Close isam file.
+ */
+int is_close(ISAM is);
+
+/*
+ * Locate a table of keys in an isam file. The ISPT is an individual
+ * position marker for that table.
+ */
+ISPT is_position(ISAM is, ISAM_P pos);
+
+/*
+ * Release ISPT.
+ */
+void is_pt_free(ISPT ip);
+
+/*
+ * Read a key from a table.
+ */
+int is_readkey(ISPT ip, void *buf);
+
+#endif