Move library source into src sub-directory

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

1 files changed, 79 insertions, 0 deletions

diff --git a/lib/tar/src/number.c b/lib/tar/src/number.c
new file mode 100644
index 0000000..2f179df
--- /dev/null
+++ b/lib/tar/src/number.c
@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * number.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+
+#include "tar/format.h"
+
+#include <ctype.h>
+#include <stdio.h>
+
+int read_octal(const char *str, int digits, sqfs_u64 *out)
+{
+	sqfs_u64 result = 0;
+
+	while (digits > 0 && isspace(*str)) {
+		++str;
+		--digits;
+	}
+
+	while (digits > 0 && *str >= '0' && *str <= '7') {
+		if (result > 0x1FFFFFFFFFFFFFFFUL) {
+			fputs("numeric overflow parsing tar header\n", stderr);
+			return -1;
+		}
+
+		result = (result << 3) | (*(str++) - '0');
+		--digits;
+	}
+
+	*out = result;
+	return 0;
+}
+
+static int read_binary(const char *str, int digits, sqfs_u64 *out)
+{
+	sqfs_u64 x, ov, result = 0;
+	bool first = true;
+
+	while (digits > 0) {
+		x = *((const unsigned char *)str++);
+		--digits;
+
+		if (first) {
+			first = false;
+			if (x == 0xFF) {
+				result = 0xFFFFFFFFFFFFFFFFUL;
+			} else {
+				x &= 0x7F;
+				result = 0;
+				if (digits > 7 && x != 0)
+					goto fail_ov;
+			}
+		}
+
+		ov = (result >> 56) & 0xFF;
+
+		if (ov != 0 && ov != 0xFF)
+			goto fail_ov;
+
+		result = (result << 8) | x;
+	}
+
+	*out = result;
+	return 0;
+fail_ov:
+	fputs("numeric overflow parsing tar header\n", stderr);
+	return -1;
+}
+
+int read_number(const char *str, int digits, sqfs_u64 *out)
+{
+	if (*((const unsigned char *)str) & 0x80)
+		return read_binary(str, digits, out);
+
+	return read_octal(str, digits, out);
+}