Remodel libtar/tar2sqfs to read data from an istream_t

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 40 insertions, 0 deletions

diff --git a/lib/tar/record_to_memory.c b/lib/tar/record_to_memory.c
new file mode 100644
index 0000000..822608c
--- /dev/null
+++ b/lib/tar/record_to_memory.c
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * record_to_memory.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+
+#include "tar.h"
+#include "internal.h"
+
+char *record_to_memory(istream_t *fp, size_t size)
+{
+	char *buffer = malloc(size + 1);
+	int ret;
+
+	if (buffer == NULL)
+		goto fail_errno;
+
+	ret = istream_read(fp, buffer, size);
+	if (ret < 0)
+		goto fail;
+
+	if ((size_t)ret < size) {
+		fputs("Reading tar record: unexpected end-of-file.\n", stderr);
+		goto fail;
+	}
+
+	if (skip_padding(fp, size))
+		goto fail;
+
+	buffer[size] = '\0';
+	return buffer;
+fail_errno:
+	perror("reading tar record");
+	goto fail;
+fail:
+	free(buffer);
+	return NULL;
+}