From acc91bc260046e228d8043e91d33d6793fb41c1a Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Sat, 25 May 2024 18:18:11 +0000
Subject: driver: implemented internal queue vectorization.

---
 project/common.mk               |  1 +
 src/driver/tpax_driver_ctx.c    |  3 +++
 src/internal/tpax_driver_impl.h |  3 +++
 src/logic/tpax_queue_vector.c   | 60 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 67 insertions(+)
 create mode 100644 src/logic/tpax_queue_vector.c

diff --git a/project/common.mk b/project/common.mk
index 378de0c..8bc157e 100644
--- a/project/common.mk
+++ b/project/common.mk
@@ -8,6 +8,7 @@ API_SRCS = \
 	src/logic/tpax_init_ustar_header.c \
 	src/logic/tpax_file_create_memory_snapshot.c \
 	src/logic/tpax_file_create_tmpfs_snapshot.c \
+	src/logic/tpax_queue_vector.c \
 	src/output/tpax_output_error.c \
 	src/skin/tpax_skin_default.c \
 
diff --git a/src/driver/tpax_driver_ctx.c b/src/driver/tpax_driver_ctx.c
index 3eca506..77eedd1 100644
--- a/src/driver/tpax_driver_ctx.c
+++ b/src/driver/tpax_driver_ctx.c
@@ -589,6 +589,9 @@ static void tpax_free_driver_ctx_impl(struct tpax_driver_ctx_alloc * ictx)
 	if (ictx->ctx.prefixv != ictx->ctx.prefptr)
 		free(ictx->ctx.prefixv);
 
+	if (ictx->ctx.direntv)
+		free(ictx->ctx.direntv);
+
 	argv_free(ictx->meta);
 	free(ictx);
 }
diff --git a/src/internal/tpax_driver_impl.h b/src/internal/tpax_driver_impl.h
index f5fb9c8..1779043 100644
--- a/src/internal/tpax_driver_impl.h
+++ b/src/internal/tpax_driver_impl.h
@@ -78,6 +78,7 @@ struct tpax_driver_ctx_impl {
 	char **                       prefixp;
 	char **                       prefcap;
 	char *                        prefptr[64];
+	struct tpax_dirent **         direntv;
 	struct tpax_dirent_buffer *   dirents;
 	struct tpax_dirent *          dirmark;
 	void *                        dirbuff;
@@ -275,4 +276,6 @@ static inline ssize_t tpax_get_archive_block_size(const struct tpax_driver_ctx *
 		return 0;
 }
 
+int tpax_update_queue_vector(const struct tpax_driver_ctx * dctx);
+
 #endif
diff --git a/src/logic/tpax_queue_vector.c b/src/logic/tpax_queue_vector.c
new file mode 100644
index 0000000..092f39f
--- /dev/null
+++ b/src/logic/tpax_queue_vector.c
@@ -0,0 +1,60 @@
+/**************************************************************/
+/*  tpax: a topological pax implementation                    */
+/*  Copyright (C) 2020--2024  SysDeer Technologies, LLC       */
+/*  Released under GPLv2 and GPLv3; see COPYING.TPAX.         */
+/**************************************************************/
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#include <tpax/tpax.h>
+#include "tpax_driver_impl.h"
+#include "tpax_errinfo_impl.h"
+#include "tpax_visibility_impl.h"
+
+tpax_hidden int tpax_update_queue_vector(const struct tpax_driver_ctx * dctx)
+{
+	uintptr_t                       addr;
+	struct tpax_driver_ctx_impl *   ictx;
+	struct tpax_dirent_buffer *     dentbuf;
+	struct tpax_dirent **           direntv;
+	struct tpax_dirent *            cdent;
+	struct tpax_dirent *            cnext;
+	size_t                          arrsize;
+
+	/* driver */
+	ictx = tpax_get_driver_ictx(dctx);
+
+	/* vector alloc */
+	if (ictx->direntv)
+		free(ictx->direntv);
+
+	arrsize = ictx->nqueued + 1;
+
+	if (!(ictx->direntv = calloc(arrsize,sizeof(struct tpax_dirent *))))
+		return TPAX_SYSTEM_ERROR(dctx);
+
+	if (ictx->nqueued == 0)
+		return 0;
+
+	/* queue vector */
+	dentbuf = tpax_get_driver_dirents(dctx);
+	cdent   = dentbuf->dbuf;
+
+	for (direntv=ictx->direntv; cdent; direntv++) {
+		*direntv = cdent;
+
+		addr  = (uintptr_t)cdent;
+		addr += cdent->nsize;
+		cnext = (struct tpax_dirent *)addr;
+
+		if (cnext == dentbuf->cdent) {
+			dentbuf = dentbuf->next;
+			cnext   = dentbuf ? dentbuf->dbuf : 0;
+		}
+
+		cdent = cnext;
+	}
+
+	return 0;
+}
-- 
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