From e06cc0e4519405cb1d1475045f3acfaeb91226ba Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Mon, 4 Mar 2024 23:38:03 +0000
Subject: archiver api: added slbt_ar_get_varchive_ctx() (signature-only
 virtual archive).

---
 include/slibtool/slibtool.h     |  3 +++
 src/arbits/slbt_archive_merge.c | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/include/slibtool/slibtool.h b/include/slibtool/slibtool.h
index e0e92d3..d89e184 100644
--- a/include/slibtool/slibtool.h
+++ b/include/slibtool/slibtool.h
@@ -450,6 +450,9 @@ slbt_api int  slbt_ar_get_archive_ctx   (const struct slbt_driver_ctx *, const c
 
 slbt_api void slbt_ar_free_archive_ctx  (struct slbt_archive_ctx *);
 
+slbt_api int  slbt_ar_get_varchive_ctx  (const struct slbt_driver_ctx *,
+                                         struct slbt_archive_ctx **);
+
 slbt_api int  slbt_ar_get_archive_meta  (const struct slbt_driver_ctx *,
                                          const struct slbt_raw_archive *,
                                          struct slbt_archive_meta **);
diff --git a/src/arbits/slbt_archive_merge.c b/src/arbits/slbt_archive_merge.c
index 82eaed5..dfa8f52 100644
--- a/src/arbits/slbt_archive_merge.c
+++ b/src/arbits/slbt_archive_merge.c
@@ -31,6 +31,9 @@
 /* file size format specifier */
 #define PPRIU64 "%"PRIu64
 
+/* dlopen self/force */
+static const char slbt_ar_self_dlunit[] = "@PROGRAM@";
+
 struct armap_buffer_32 {
 	uint32_t        moffset;
 	const char *    symname;
@@ -695,3 +698,37 @@ int slbt_ar_merge_archives(
 
 	return 0;
 }
+
+
+int slbt_ar_get_varchive_ctx(
+	const struct slbt_driver_ctx *	dctx,
+	struct slbt_archive_ctx **	pctx)
+{
+	struct slbt_archive_ctx *       ctx;
+	struct slbt_archive_ctx_impl *  ictx;
+	void *                          base;
+	size_t                          size;
+
+	size = sizeof(struct ar_raw_signature);
+
+	if (slbt_create_anonymous_archive_ctx(dctx,size,&ctx) < 0)
+		return SLBT_NESTED_ERROR(dctx);
+
+	ictx = slbt_get_archive_ictx(ctx);
+
+	base = ctx->map->map_addr;
+	memcpy(base,ar_signature,size);
+
+	if (slbt_ar_get_archive_meta(dctx,ctx->map,&ictx->meta) < 0) {
+		slbt_ar_free_archive_ctx(ctx);
+		return SLBT_NESTED_ERROR(dctx);
+	}
+
+	ictx->path       = slbt_ar_self_dlunit;
+	ictx->actx.meta  = ictx->meta;
+	ictx->actx.path  = &ictx->path;
+
+	*pctx = ctx;
+
+	return 0;
+}
-- 
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