V18.4.0 CAS plugin

Note that this version does not have Widevine Provisioning 4.0 support.
It is only suitable for device upgrades. A new patch with provisioning
4.0 support will be made later.

wvutil/include/string_conversions.h

@@ -0,0 +1,61 @@
+// Copyright 2018 Google LLC. All Rights Reserved. This file and proprietary
+// source code may only be used and distributed under the Widevine License
+// Agreement.
+#ifndef WVCDM_UTIL_STRING_CONVERSIONS_H_
+#define WVCDM_UTIL_STRING_CONVERSIONS_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <string>
+#include <vector>
+
+#include "util_common.h"
+
+namespace wvutil {
+
+// ASCII hex to Binary conversion.
+std::vector<uint8_t> a2b_hex(const std::string& b);
+std::vector<uint8_t> a2b_hex(const std::string& label,
+                             const std::string& b);
+std::string a2bs_hex(const std::string& b);
+
+// Binary to ASCII hex conversion. The default versions limit output to 2k to
+// protect us from log spam. The unlimited version has no length limit.
+std::string b2a_hex(const std::vector<uint8_t>& b);
+std::string unlimited_b2a_hex(const std::vector<uint8_t>& b);
+std::string b2a_hex(const std::string& b);
+std::string unlimited_b2a_hex(const std::string& b);
+std::string HexEncode(const uint8_t* bytes, size_t size);
+std::string UnlimitedHexEncode(const uint8_t* bytes, size_t size);
+
+// Base64 encoding/decoding.
+// Converts binary data into the ASCII Base64 character set and vice
+// versa using the encoding rules defined in RFC4648 section 4.
+std::string Base64Encode(const std::vector<uint8_t>& bin_input);
+std::string Base64Encode(const std::string& bin_input);
+std::vector<uint8_t> Base64Decode(const std::string& bin_input);
+
+// URL-Safe Base64 encoding/decoding.
+// Converts binary data into the URL/Filename safe ASCII Base64
+// character set and vice versa using the encoding rules defined in
+// RFC4648 section 5.
+std::string Base64SafeEncode(const std::vector<uint8_t>& bin_input);
+std::string Base64SafeEncode(const std::string& bin_input);
+std::vector<uint8_t> Base64SafeDecode(const std::string& bin_input);
+// URL-Safe Base64 encoding without padding.
+// Similar to Base64SafeEncode(), without any padding character '='
+// at the end.
+std::string Base64SafeEncodeNoPad(const std::vector<uint8_t>& bin_input);
+std::string Base64SafeEncodeNoPad(const std::string& bin_input);
+
+// Host to Network/Network to Host conversion.
+int64_t htonll64(int64_t x);
+inline int64_t ntohll64(int64_t x) { return htonll64(x); }
+
+// Encode unsigned integer into a big endian formatted string.
+std::string EncodeUint32(uint32_t u);
+
+}  // namespace wvutil
+
+#endif  // WVCDM_UTIL_STRING_CONVERSIONS_H_