Move all C code into repo.

node.go

@@ -38,3 +38,54 @@ func (n *node) size() int {
 
 // TODO: #define MDB_GET_KEY(node, keyptr)	{ if ((keyptr) != NULL) { (keyptr)->mv_size = NODEKSZ(node); (keyptr)->mv_data = NODEKEY(node); } }
 // TODO: #define MDB_GET_KEY2(node, key)	{ key.mv_size = NODEKSZ(node); key.mv_data = NODEKEY(node); }
+
+// Compact the main page after deleting a node on a subpage.
+// @param[in] mp The main page to operate on.
+// @param[in] indx The index of the subpage on the main page.
+func (n *node) shrink(index int) {
+	/*
+	MDB_node *node;
+	MDB_page *sp, *xp;
+	char *base;
+	int nsize, delta;
+	indx_t		 i, numkeys, ptr;
+
+	node = NODEPTR(mp, indx);
+	sp = (MDB_page *)NODEDATA(node);
+	delta = SIZELEFT(sp);
+	xp = (MDB_page *)((char *)sp + delta);
+
+	// shift subpage upward
+	if (IS_LEAF2(sp)) {
+		nsize = NUMKEYS(sp) * sp->mp_pad;
+		if (nsize & 1)
+			return;		// do not make the node uneven-sized
+		memmove(METADATA(xp), METADATA(sp), nsize);
+	} else {
+		int i;
+		numkeys = NUMKEYS(sp);
+		for (i=numkeys-1; i>=0; i--)
+			xp->mp_ptrs[i] = sp->mp_ptrs[i] - delta;
+	}
+	xp->mp_upper = sp->mp_lower;
+	xp->mp_lower = sp->mp_lower;
+	xp->mp_flags = sp->mp_flags;
+	xp->mp_pad = sp->mp_pad;
+	COPY_PGNO(xp->mp_pgno, mp->mp_pgno);
+
+	nsize = NODEDSZ(node) - delta;
+	SETDSZ(node, nsize);
+
+	// shift lower nodes upward
+	ptr = mp->mp_ptrs[indx];
+	numkeys = NUMKEYS(mp);
+	for (i = 0; i < numkeys; i++) {
+		if (mp->mp_ptrs[i] <= ptr)
+			mp->mp_ptrs[i] += delta;
+	}
+
+	base = (char *)mp + mp->mp_upper;
+	memmove(base + delta, base, ptr - mp->mp_upper + NODESIZE + NODEKSZ(node));
+	mp->mp_upper += delta;
+	*/
+}

page.go

@@ -17,6 +17,26 @@ const (
 	KeepPage     = 0x8000 /**< leave this page alone during spill */
 )
 
+// maxCommitPages is the maximum number of pages to commit in one writev() call.
+const maxCommitPages 64
+
+/* max bytes to write in one call */
+const maxWriteByteCount 0x80000000U    // TODO: #define MAX_WRITE 0x80000000U >> (sizeof(ssize_t) == 4))
+
+// TODO:
+// #if defined(IOV_MAX) && IOV_MAX < MDB_COMMIT_PAGES
+// #undef MDB_COMMIT_PAGES
+// #define MDB_COMMIT_PAGES	IOV_MAX
+// #endif
+
+// TODO: #define MDB_PS_MODIFY	1
+// TODO: #define MDB_PS_ROOTONLY	2
+// TODO: #define MDB_PS_FIRST	4
+// TODO: #define MDB_PS_LAST		8
+
+// TODO: #define MDB_SPLIT_REPLACE	MDB_APPENDDUP	/**< newkey is not new */
+
+
 type page struct {
 	header struct {
 		id                int
@@ -28,6 +48,11 @@ type page struct {
 	metadata []byte
 }
 
+type pageState struct {
+	head int  /**< Reclaimed freeDB pages, or NULL before use */
+	last int  /**< ID of last used record, or 0 if !mf_pghead */
+}
+
 // nodeCount returns the number of nodes on the page.
 func (p *page) nodeCount() int {
 	return 0 // (p.header.lower - unsafe.Sizeof(p.header) >> 1
@@ -42,3 +67,4 @@ func (p *page) remainingSize() int {
 func (p *page) remainingSize() int {
 	return p.header.upper - p.header.lower
 }
+

xcursor.go

@@ -6,3 +6,4 @@ type xcursor struct {
 	bucketx    *bucketx
 	bucketFlag int
 }
+