From 88652085717f161e94c5bb9828fe23cddfdfbd22 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C3=A9o=20Lam?= <leo@innovatetechnologi.es>
Date: Sun, 11 Jun 2017 14:09:57 +0200
Subject: [PATCH] IOS/ESFormats: Add ParseCertChain

This will be used to avoid duplicating cert chain parsing code.
---
 Source/Core/Core/IOS/ES/Formats.cpp | 18 ++++++++++++++++++
 Source/Core/Core/IOS/ES/Formats.h   |  2 ++
 2 files changed, 20 insertions(+)

diff --git a/Source/Core/Core/IOS/ES/Formats.cpp b/Source/Core/Core/IOS/ES/Formats.cpp
index 377d36eb28..f66e61c07b 100644
--- a/Source/Core/Core/IOS/ES/Formats.cpp
+++ b/Source/Core/Core/IOS/ES/Formats.cpp
@@ -681,5 +681,23 @@ std::vector<u8> CertReader::GetPublicKey() const
   const auto key_begin = m_bytes.begin() + info.first;
   return std::vector<u8>(key_begin, key_begin + info.second);
 }
+
+std::map<std::string, CertReader> ParseCertChain(const std::vector<u8>& chain)
+{
+  std::map<std::string, CertReader> certs;
+
+  size_t processed = 0;
+  while (processed != chain.size())
+  {
+    CertReader cert_reader{std::vector<u8>(chain.begin() + processed, chain.end())};
+    if (!cert_reader.IsValid())
+      return certs;
+
+    processed += cert_reader.GetBytes().size();
+    const std::string name = cert_reader.GetName();
+    certs.emplace(std::move(name), std::move(cert_reader));
+  }
+  return certs;
+}
 }  // namespace ES
 }  // namespace IOS
diff --git a/Source/Core/Core/IOS/ES/Formats.h b/Source/Core/Core/IOS/ES/Formats.h
index 3606b12f49..943f93d8da 100644
--- a/Source/Core/Core/IOS/ES/Formats.h
+++ b/Source/Core/Core/IOS/ES/Formats.h
@@ -284,5 +284,7 @@ public:
 private:
   bool m_is_valid = false;
 };
+
+std::map<std::string, CertReader> ParseCertChain(const std::vector<u8>& chain);
 }  // namespace ES
 }  // namespace IOS