From 6a7e25a01553a02630daac61f06c4bdbbdc4180b Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Thu, 18 Jul 2024 05:13:52 +0000
Subject: driver: list, read, and copy modes: attempt mapping the source
 archive.

---
 src/driver/tpax_driver_ctx.c | 56 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

(limited to 'src/driver')

diff --git a/src/driver/tpax_driver_ctx.c b/src/driver/tpax_driver_ctx.c
index d926631..aaaea59 100644
--- a/src/driver/tpax_driver_ctx.c
+++ b/src/driver/tpax_driver_ctx.c
@@ -576,6 +576,38 @@ static int tpax_driver_keyval_error(
 	return TPAX_ERROR;
 }
 
+static int tpax_driver_srcstat_error(
+	struct tpax_driver_ctx_impl *   ctx,
+	const struct argv_entry *       archive,
+	const char *                    program)
+{
+	int             lerrno;
+	const char *    errstr;
+
+	lerrno = errno;
+	errno  = 0;
+
+	errstr = strerror(lerrno);
+	errstr = errno ? "" : errstr;
+	errno  = lerrno;
+
+	if (archive) {
+		tpax_dprintf(
+			ctx->fdctx.fderr,
+			"%s: could not stat archive file '%s' (%s).\n",
+			program,archive->arg,errstr);
+	} else {
+		tpax_dprintf(
+			ctx->fdctx.fderr,
+			"%s: could not stat input source file <fd=%d> (%s).\n",
+			program,ctx->fdctx.fdin,errstr);
+	}
+
+	tpax_lib_free_driver_ctx(&ctx->ctx);
+
+	return TPAX_ERROR;
+}
+
 int tpax_lib_get_driver_ctx(
 	char **				argv,
 	char **				envp,
@@ -905,6 +937,27 @@ int tpax_lib_get_driver_ctx(
 		if (!tpax_driver_is_valid_keyval(*pkeyval))
 			return tpax_driver_keyval_error(ctx,*pkeyval,program);
 
+	/* source data mapping (non-critical) */
+	if (cctx.srcflags) {
+		if (fstat(fdctx->fdin,&ctx->srcstat) < 0)
+			return tpax_driver_srcstat_error(ctx,archive,program);
+
+		ctx->mapsize = ctx->srcstat.st_size;
+		ctx->mapaddr = mmap(
+			0,ctx->mapsize,
+			PROT_READ,MAP_PRIVATE,
+			fdctx->fdin,0);
+
+		if (ctx->mapaddr == MAP_FAILED) {
+			ctx->cctx.srcflags = TPAX_SOURCE_DATA_FILEIO;
+			ctx->mapaddr       = 0;
+			ctx->mapsize       = 0;
+		} else {
+			ctx->cctx.srcflags = TPAX_SOURCE_DATA_MAPPED;
+		}
+	}
+
+	/* all done */
 	if (archive) {
 		ctx->file     = archive->arg;
 		ctx->ctx.file = &ctx->file;
@@ -945,6 +998,9 @@ static void tpax_free_driver_ctx_impl(struct tpax_driver_ctx_alloc * ictx)
 	if (ictx->ctx.keyvalv)
 		free(ictx->ctx.keyvalv);
 
+	if (ictx->ctx.mapaddr)
+		munmap(ictx->ctx.mapaddr,ictx->ctx.mapsize);
+
 	if (ictx->ctx.bufaddr)
 		munmap(ictx->ctx.bufaddr,ictx->ctx.bufsize);
 
-- 
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