Security-57031.1.35.tar.gz

[apple/security.git] / Security / libsecurity_codesigning / lib / reqreader.h

diff --git a/Security/libsecurity_codesigning/lib/reqreader.h b/Security/libsecurity_codesigning/lib/reqreader.h
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+/*
+ * Copyright (c) 2007,2011,2013 Apple Inc. All Rights Reserved.
+ * 
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+//
+// reqreader - Requirement language (exprOp) reader/scanner
+//
+#ifndef _H_REQREADER
+#define _H_REQREADER
+
+#include <security_codesigning/requirement.h>
+#include <Security/SecCertificate.h>
+
+namespace Security {
+namespace CodeSigning {
+
+
+//
+// The Reader class provides structured access to a opExpr-type code requirement.
+//
+class Requirement::Reader {
+public:
+       Reader(const Requirement *req);
+       
+       const Requirement *requirement() const { return mReq; }
+       
+       template <class T> T get();
+       void getData(const void *&data, size_t &length);
+       
+       std::string getString();
+       const unsigned char *getHash();
+       const unsigned char *getSHA1();
+       
+       template <class T> void getData(T *&data, size_t &length)
+       { return getData(reinterpret_cast<const void *&>(data), length); }
+
+protected:
+       void checkSize(size_t length)
+       {
+               if (mPC + length < mPC || mPC + length > mReq->length())
+                       MacOSError::throwMe(errSecCSReqInvalid);
+       }
+       
+       void skip(size_t length);
+       
+       Offset pc() const { return mPC; }
+       bool atEnd() const { return mPC >= mReq->length(); }
+       
+private:
+       const Requirement * const mReq;
+       Offset mPC;
+};
+
+template <class T>
+T Requirement::Reader::get()
+{
+       checkSize(sizeof(T));
+       const Endian<const T> *value = mReq->at<Endian<const T> >(mPC);
+       mPC += sizeof(T);
+       return *value;
+}
+
+
+}      // CodeSigning
+}      // Security
+
+#endif //_H_REQREADER