Add support for reading old style GNU sparse tar file format

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

1 files changed, 127 insertions, 0 deletions

diff --git a/tests/tar_sparse_gnu.c b/tests/tar_sparse_gnu.c
new file mode 100644
index 0000000..2f2e1c5
--- /dev/null
+++ b/tests/tar_sparse_gnu.c
@@ -0,0 +1,127 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include "util.h"
+#include "tar.h"
+
+#include <unistd.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <stdio.h>
+
+#define STR(x) #x
+#define STRVALUE(x) STR(x)
+
+#define TEST_PATH STRVALUE(TESTPATH)
+
+static int open_read(const char *path)
+{
+	int fd = open(path, O_RDONLY);
+
+	if (fd < 0) {
+		perror(path);
+		exit(EXIT_FAILURE);
+	}
+
+	return fd;
+}
+
+int main(void)
+{
+	tar_sparse_data_t *sparse;
+	tar_header_decoded_t hdr;
+	int fd;
+
+	assert(chdir(TEST_PATH) == 0);
+
+	fd = open_read("sparse-files/gnu-small.tar");
+	assert(read_header(fd, &hdr) == 0);
+	assert(hdr.sb.st_mode == (S_IFREG | 0644));
+	assert(hdr.sb.st_uid == 01750);
+	assert(hdr.sb.st_gid == 01750);
+	assert(hdr.sb.st_size == 524288);
+	assert(strcmp(hdr.name, "input.bin") == 0);
+	assert(!hdr.unknown_record);
+
+	sparse = hdr.sparse;
+	assert(sparse != NULL);
+	assert(sparse->offset == 0);
+	assert(sparse->count == 4096);
+
+	sparse = sparse->next;
+	assert(sparse != NULL);
+	assert(sparse->offset == 262144);
+	assert(sparse->count == 4096);
+
+	sparse = sparse->next;
+	assert(sparse != NULL);
+	assert(sparse->offset == 524288);
+	assert(sparse->count == 0);
+
+	assert(sparse->next == NULL);
+
+	clear_header(&hdr);
+	close(fd);
+
+	fd = open_read("sparse-files/gnu.tar");
+	assert(read_header(fd, &hdr) == 0);
+	assert(hdr.sb.st_mode == (S_IFREG | 0644));
+	assert(hdr.sb.st_uid == 01750);
+	assert(hdr.sb.st_gid == 01750);
+	assert(hdr.sb.st_size == 2097152);
+	assert(strcmp(hdr.name, "input.bin") == 0);
+	assert(!hdr.unknown_record);
+
+	sparse = hdr.sparse;
+	assert(sparse != NULL);
+	assert(sparse->offset == 0);
+	assert(sparse->count == 4096);
+
+	sparse = sparse->next;
+	assert(sparse != NULL);
+	assert(sparse->offset == 262144);
+	assert(sparse->count == 4096);
+
+	sparse = sparse->next;
+	assert(sparse != NULL);
+	assert(sparse->offset == 524288);
+	assert(sparse->count == 4096);
+
+	sparse = sparse->next;
+	assert(sparse != NULL);
+	assert(sparse->offset == 786432);
+	assert(sparse->count == 4096);
+
+	sparse = sparse->next;
+	assert(sparse != NULL);
+	assert(sparse->offset == 1048576);
+	assert(sparse->count == 4096);
+
+	sparse = sparse->next;
+	assert(sparse != NULL);
+	assert(sparse->offset == 1310720);
+	assert(sparse->count == 4096);
+
+	sparse = sparse->next;
+	assert(sparse != NULL);
+	assert(sparse->offset == 1572864);
+	assert(sparse->count == 4096);
+
+	sparse = sparse->next;
+	assert(sparse != NULL);
+	assert(sparse->offset == 1835008);
+	assert(sparse->count == 4096);
+
+	sparse = sparse->next;
+	assert(sparse != NULL);
+	assert(sparse->offset == 2097152);
+	assert(sparse->count == 0);
+
+	sparse = sparse->next;
+	assert(sparse == NULL);
+
+	clear_header(&hdr);
+	close(fd);
+
+	return EXIT_SUCCESS;
+}