code base: moved tpax_archive_seal() to own translation unit.

1 files changed, 104 insertions, 0 deletions

diff --git a/src/logic/tpax_archive_write.c b/src/logic/tpax_archive_write.c
new file mode 100644
index 0000000..b4dcf2a
--- /dev/null
+++ b/src/logic/tpax_archive_write.c
@@ -0,0 +1,104 @@
+/**************************************************************/
+/*  tpax: a topological pax implementation                    */
+/*  Copyright (C) 2020--2024  SysDeer Technologies, LLC       */
+/*  Released under GPLv2 and GPLv3; see COPYING.TPAX.         */
+/**************************************************************/
+
+#include <tpax/tpax.h>
+#include "tpax_driver_impl.h"
+#include "tpax_errinfo_impl.h"
+#include "tpax_visibility_impl.h"
+
+static int tpax_archive_append_memory_data(
+	int                             fdout,
+	void *                          buf,
+	ssize_t                         nbytes)
+{
+	ssize_t ret;
+	char  * ch;
+
+	for (ch=buf; nbytes; ch+=ret) {
+		ret = write(fdout,ch,nbytes);
+
+		while ((ret < 0) && (errno == EINTR))
+			ret = write(fdout,ch,nbytes);
+
+		if (ret < 0)
+			return ret;
+
+		nbytes -= ret;
+	}
+
+	return 0;
+}
+
+static int tpax_archive_append_pad(
+	const struct tpax_driver_ctx *  dctx,
+	int                             fdout,
+	const struct stat *             st)
+{
+	int     ret;
+	off_t   cpos;
+	ssize_t nbytes;
+	char    buf[512];
+
+	nbytes  = st->st_size;
+	nbytes += 0x1ff;
+	nbytes |= 0x1ff;
+	nbytes ^= 0x1ff;
+	nbytes -= st->st_size;
+
+	memset(buf,0,nbytes);
+
+	cpos  = tpax_get_driver_cpos(dctx);
+	cpos += st->st_size + nbytes;
+
+	if (!(ret = tpax_archive_append_memory_data(fdout,buf,nbytes)))
+		tpax_set_driver_cpos(dctx,cpos);
+
+	return ret;
+}
+
+int tpax_archive_seal(const struct tpax_driver_ctx * dctx)
+{
+	int     fdout;
+	off_t   cpos;
+	ssize_t nbytes;
+	ssize_t nwritten;
+	ssize_t blksize;
+	char    buf[512];
+
+	blksize = tpax_get_archive_block_size(dctx);
+	cpos    = tpax_get_driver_cpos(dctx);
+
+	if (cpos % 512)
+		return TPAX_CUSTOM_ERROR(dctx,TPAX_ERR_FLOW_ERROR);
+
+	fdout = tpax_driver_fdout(dctx);
+	memset(buf,0,sizeof(buf));
+
+	switch (cpos % blksize) {
+		case 0:
+			nbytes = cpos + blksize;
+			break;
+
+		default:
+			nbytes  = cpos / blksize;
+			nbytes *= blksize;
+			nbytes += blksize;
+
+			if (nbytes-cpos == 512)
+				nbytes += blksize;
+	}
+
+	for (nwritten=cpos; nwritten<nbytes; nwritten+=512) {
+		if (tpax_archive_append_memory_data(fdout,buf,512) < 0)
+			return TPAX_SYSTEM_ERROR(dctx);
+
+		tpax_set_driver_cpos(dctx,nwritten);
+	}
+
+	(void)tpax_archive_append_pad;
+
+	return 0;
+}