Make the test for reading gtar sparse entries more robust;

it now verifies that the returned blocks have the correct data
at the correct file offsets, ignoring any null padding that
may exist.

Approved by: re (blanket, libarchive test suite)

lib/libarchive/test/test_read_format_gtar_sparse.c

@@ -33,6 +33,16 @@ __FBSDID("$FreeBSD$");
  *   * a single 'a' byte at offset 200000
  */
 
+static struct contents {
+	off_t	o;
+	size_t	s;
+	char *d;
+} archive_contents[] = {
+	{ 1000000, 1, "a" },
+	{ 2000000, 1, "a" },
+	{ 3145728, 0, NULL }
+};
+
 /* Old GNU tar sparse format. */
 static unsigned char archive_old[] = {
 31,139,8,0,150,221,'l','F',0,3,'+','.','H',',','*','N','e',160,')','0',0,
@@ -81,6 +91,145 @@ static unsigned char archive_0_1[] = {
 164,'I',243,147,'H','$',18,227,240,1,'Q',127,'c',137,0,14,0,0};
 
 /* GNU tar "1.0" posix format, as written by GNU tar 1.16.1. */
+#if 1
+static unsigned char archive_1_0[] = {
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+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,0,0};
+
+#else
 static unsigned char archive_1_0[] = {
 31,139,8,0,210,221,'l','F',0,3,237,148,207,'N',195,'0',12,198,'s',206,'S',
 244,9,210,216,206,159,238,208,'+',236,132,144,16,15,16,'A',14,'E',219,'@',
@@ -97,56 +246,66 @@ static unsigned char archive_1_0[] = {
 '\'',185,'(',144,147,22,'P','B','I',27,143,'C','>','z','W',179,'+',153,227,
 132,'k','7',192,204,26,'~','?',12,195,'0',12,'s','y','>',0,244,'|','e',9,
 0,18,0,0};
+#endif
 
 #endif
 
-static void
-test_data(const char *buff, int buff_size,
-    int start_index, int data_index, const char *data)
-{
-	int i;
-
-	failure("This is known broken in libarchive 1.x < 1.9 and 2.x < 2.2");
-	assert(buff_size > data_index - start_index);
-	/* If the above fails, we can't test the actual contents. */
-	if (buff_size < data_index - start_index)
-		return;
-	for (i = 0; i < data_index - start_index; i++)
-		assert(buff[i] == 0);
-	assert(0 == memcmp(buff + (data_index - start_index), data, strlen(data)));
-	i += strlen(data);
-	for (; i < buff_size; i++)
-		assert(buff[i] == 0);
-}
+#define min(a,b) ((a) < (b) ? (a) : (b))
 
 static void
-verify_archive(void *b, size_t l)
+verify_archive(void *b, size_t l, struct contents *cts)
 {
 	struct archive_entry *ae;
 	struct archive *a;
-	const void *d;
-	size_t s;
-	off_t o;
+	int err;
+	/* data, size, offset of next expected block. */
+	struct contents e;
+	/* data, size, offset of block read from archive. */
+	const void *ad;
+	size_t as;
+	off_t ao;
 
 	assert((a = archive_read_new()) != NULL);
 	assert(0 == archive_read_support_compression_all(a));
-	assert(0 == archive_read_support_format_all(a));
-	assert(0 == archive_read_open_memory(a, b, l));
+	assert(0 == archive_read_support_format_tar(a));
+	assert(0 == read_open_memory(a, b, l, 3));
 	assertEqualIntA(a, 0, archive_read_next_header(a, &ae));
 
-	assertEqualIntA(a, 0, archive_read_data_block(a, &d, &s, &o));
-	test_data(d, s, o, 1000000, "a");
-	assertEqualIntA(a, 0, archive_read_data_block(a, &d, &s, &o));
-	test_data(d, s, o, 2000000, "a");
-	assertEqualIntA(a, ARCHIVE_EOF, archive_read_data_block(a, &d, &s, &o));
+	e = *cts++;
+	while (0 == (err = archive_read_data_block(a, &ad, &as, &ao))) {
+		while (as > 0) {
+			/* Anything before the next expected block must be NULL. */
+			char c = *(char *)ad;
+			if(ao < e.o) {
+				assert(c == 0);
+			} else if (ao == e.o) {
+				assert(c == *e.d);
+				e.d++;
+				e.o++;
+				e.s--;
+				/* End of expected? step to next expected. */
+				if (e.s <= 0)
+					e = *cts++;
+			} else {
+				failure("Expected data not found");
+				assert(ao <= e.o);
+				archive_read_finish(a);
+				return;
+			}
+			ad++;
+			ao++;
+			as--;
+		}
+	}
+	assertEqualIntA(a, err, ARCHIVE_EOF);
 	failure("Size returned at EOF must be zero");
-	assertEqualInt(s, 0);
+	assertEqualInt(as, 0);
 #if ARCHIVE_VERSION_STAMP < 1009000
 	/* libarchive < 1.9 doesn't get this right */
 	skipping("offset of final sparse chunk");
 #else
 	failure("Offset of final empty chunk must be same as file size");
-	assertEqualInt(o, 3145728);
+	assertEqualInt(ao, e.o);
 #endif
 
 	assert(0 == archive_read_close(a));
@@ -159,7 +318,11 @@ verify_archive(void *b, size_t l)
 
 DEFINE_TEST(test_read_format_gtar_sparse)
 {
-	verify_archive(archive_old, sizeof(archive_old));
+	FILE *t = fopen("archive_1_0.tgz", "w");
+	fwrite(archive_1_0, sizeof(archive_1_0), 1, t);
+	fclose(t);
+
+	verify_archive(archive_old, sizeof(archive_old), archive_contents);
 
 	/*
 	 * libarchive < 1.9 doesn't support the newer sparse formats
@@ -168,17 +331,17 @@ DEFINE_TEST(test_read_format_gtar_sparse)
 #if ARCHIVE_VERSION_STAMP < 1009000
 	skipping("read support for GNUtar sparse format 0.0");
 #else
-	verify_archive(archive_0_0, sizeof(archive_0_0));
+	verify_archive(archive_0_0, sizeof(archive_0_0), archive_contents);
 #endif
 #if ARCHIVE_VERSION_STAMP < 1009000
 	skipping("read support for GNUtar sparse format 0.1");
 #else
-	verify_archive(archive_0_1, sizeof(archive_0_1));
+	verify_archive(archive_0_1, sizeof(archive_0_1), archive_contents);
 #endif
 #if ARCHIVE_VERSION_STAMP < 1009000
 	skipping("read support for GNUtar sparse format 1.0");
 #else
-	verify_archive(archive_1_0, sizeof(archive_1_0));
+	verify_archive(archive_1_0, sizeof(archive_1_0), archive_contents);
 #endif
 }