Merge pull request #37 from crayy8/rejistry_updates

Rejistry updates

Author: jayaramcs

rejistry++/src/BinaryBlock.h

@@ -50,8 +50,8 @@ namespace Rejistry {
     protected:
         BinaryBlock() {};
 
-        RegistryByteBuffer * _buf;
-        uint32_t _offset;
+        RegistryByteBuffer * _buf = 0;
+        uint32_t _offset = 0;
 
         uint16_t getWord(uint32_t offset) const;
 

rejistry++/src/Buffer.h

@@ -51,9 +51,9 @@ namespace Rejistry {
 
         virtual ~Buffer();
 
-        uint32_t _capacity;
-        uint32_t _limit;
-        uint32_t _position;
+        uint32_t _capacity = 0;
+        uint32_t _limit = 0;
+        uint32_t _position = 0;
     };
 };
 

rejistry++/src/ByteBuffer.cpp

@@ -58,7 +58,7 @@ namespace Rejistry {
             try {
                 _buffer.resize(length);
             } 
-            catch (std::bad_alloc &e)
+            catch (std::bad_alloc &)
             {
                 throw RegistryParseException("Cannot allocate memory for registry byte buffer.");
             }
@@ -73,31 +73,31 @@ namespace Rejistry {
         }
 
         /**
+         *  This method is based off of https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html#get-byte:A-int-int-
+         * * @param dst: destination byte array to write data to
+         * * @param offset: Offset within the destination byte array to start writting data to
+         * * @param length: the number of bytes to write to the destination byte array
          * Throws exception if offset or length are too large. */
         void ByteBuffer::get(ByteArray& dst, const uint32_t offset, const uint32_t length) {
             if (length == 0) {
                 // No data requested.
                 return;
             }
 
-            if (offset > dst.size()) {
+            if (offset >= dst.size()) {
                 throw RegistryParseException("Offset is greater than destination buffer size.");
             }
 
-            if ((dst.size() - offset) > length) {
+            if ((dst.size() - offset) < length) {
                 throw RegistryParseException("Length is greater than available space in destination buffer.");
             }
 
-            if ((_position + offset) > _limit) {
-                throw RegistryParseException("Starting position is beyond end of buffer.");
-            }
-
-            if ((_position + offset + length) > _limit) {
+            if ((_position + length) > _limit) {
                 throw RegistryParseException("Number of requested bytes exceeds buffer size.");
             }
 
-            memcpy(&dst[0], &_buffer[_position + offset], length);
-            _position += offset;
+            memcpy(&dst[offset], &_buffer[_position], length);
+            _position += length;
         }
 
         /**

rejistry++/src/ByteBuffer.h

@@ -55,19 +55,19 @@ namespace Rejistry {
          * Copy 'length' bytes from this buffer into the given destination,
          * starting at the current position in this buffer and at the given
          * offset in the destination. The position of this buffer is incremented
-         * by length.
+         * 
          * @param dst The destination into which to copy bytes.
-         * @param offset The offset within the destination buffer to copy bytes to.
+         * @param offset The offset within the destination buffer to start copying data
          * @param length The number of bytes to copy from this buffer.
          * @throws RegistryParseException
          */
         void get(ByteArray& dst, const uint32_t offset, const uint32_t length);
 
-        /// Get two bytes from the current position in the buffer.
+        /// Get two bytes from an offset in the buffer
         uint16_t getShort(uint32_t offset) const;
-        /// Get four bytes from the current position in the buffer.
+        /// Get four bytes from an offset in the buffer
         uint32_t getInt(uint32_t offset) const;
-        /// Get eight bytes from the current position in the buffer.
+        /// Get eight bytes from an offset in the buffer
         uint64_t getLong(uint32_t offset) const;
 
     private:
@@ -76,14 +76,7 @@ namespace Rejistry {
 
         void initializeBuffer(const uint8_t * buf, const uint32_t length);
 
-        template <typename T> T read() const {
-            T bytes = read<T>(_position);
-            if (bytes != NULL) {
-                _position += sizeof(T);
-            }
-            return bytes;
-        }
-
+        /// read at specified offset
         template <typename T> T read(uint32_t offset) const {
             if (offset + sizeof(T) <= _limit) {
                 return *((T*)&_buffer[offset]);

rejistry++/src/Cell.cpp

@@ -26,6 +26,7 @@
  *
  */
 #include <cstdlib>
+#include <memory>
 
 // Local includes
 #include "Cell.h"
@@ -36,15 +37,23 @@
 namespace Rejistry {
 
     uint32_t Cell::getLength() const {
-        return std::abs((int)getDWord(LENGTH_OFFSET));
+        int32_t raw = (int32_t)getDWord(LENGTH_OFFSET);
+        if (raw == (int32_t)0x80000000) {
+            throw RegistryParseException("Invalid cell length.");
+        }
+        return (uint32_t)(raw < 0 ? -raw : raw);
     }
 
     bool Cell::isActive() const {
         return ((int)getDWord(LENGTH_OFFSET) < 0x0);
     }
 
     std::vector<uint8_t> Cell::getData() const {
-        return _buf->getData(getAbsoluteOffset(DATA_OFFSET), getLength() - DATA_OFFSET);
+        uint32_t len = getLength();
+        if (len < DATA_OFFSET) {
+            throw RegistryParseException("Cell length too small.");
+        }
+        return _buf->getData(getAbsoluteOffset(DATA_OFFSET), len - DATA_OFFSET);
     }
 
     std::string Cell::getDataSignature() const {
@@ -64,31 +73,31 @@ namespace Rejistry {
     }
 
     SubkeyListRecord::SubkeyListRecordPtr Cell::getLFRecord() const {
-        return new LFRecord(_buf, getAbsoluteOffset(DATA_OFFSET));
+        return std::make_unique<LFRecord>(_buf, getAbsoluteOffset(DATA_OFFSET));
     }
 
     SubkeyListRecord::SubkeyListRecordPtr Cell::getLHRecord() const {
-        return new LHRecord(_buf, getAbsoluteOffset(DATA_OFFSET));
+        return std::make_unique<LHRecord>(_buf, getAbsoluteOffset(DATA_OFFSET));
     }
 
     SubkeyListRecord::SubkeyListRecordPtr Cell::getRIRecord() const {
-        return new RIRecord(_buf, getAbsoluteOffset(DATA_OFFSET));
+        return std::make_unique<RIRecord>(_buf, getAbsoluteOffset(DATA_OFFSET));
     }
 
-    LIRecord::LIRecordPtr Cell::getLIRecord() const {
-        return new LIRecord(_buf, getAbsoluteOffset(DATA_OFFSET));
+    SubkeyListRecord::SubkeyListRecordPtr Cell::getLIRecord() const {
+        return std::make_unique<LIRecord>(_buf, getAbsoluteOffset(DATA_OFFSET));
     }
 
     DBRecord::DBRecordPtr Cell::getDBRecord() const {
-        return new DBRecord(_buf, getAbsoluteOffset(DATA_OFFSET));
+        return std::make_unique<DBRecord>(_buf, getAbsoluteOffset(DATA_OFFSET));
     }
 
     DBIndirectRecord::DBIndirectRecordPtr Cell::getDBIndirectRecord() const {
-        return new DBIndirectRecord(_buf, getAbsoluteOffset(DATA_OFFSET));
+        return std::make_unique<DBIndirectRecord>(_buf, getAbsoluteOffset(DATA_OFFSET));
     }
 
     ValueListRecord::ValueListRecordPtr Cell::getValueListRecord(const uint32_t numValues) const {
-        return new ValueListRecord(_buf, getAbsoluteOffset(DATA_OFFSET), numValues);
+        return std::make_unique<ValueListRecord>(_buf, getAbsoluteOffset(DATA_OFFSET), numValues);
     }
 
     SubkeyListRecord::SubkeyListRecordPtr Cell::getSubkeyList() const {
@@ -110,5 +119,4 @@ namespace Rejistry {
             throw RegistryParseException("Unexpected subkey list type: " + magic);
         }
     }
-
 };

rejistry++/src/Cell.h

@@ -133,49 +133,49 @@ namespace Rejistry {
 
         /**
          * Interprets the cell data as an VKRecord and returns it.
-         * @returns Pointer to an VKRecord object.
+         * @returns Pointer to an VKRecord object. (Caller must free using delete)
          * @throws RegistryParseException
          */
         VKRecord::VKRecordPtr getVKRecord() const;
 
         /**
          * Interprets the cell data as an LFRecord and returns it.
-         * @returns Pointer to an LFRecord object.
+         * @returns Unique pointer to an LFRecord object.
          * @throws RegistryParseException
          */
         SubkeyListRecord::SubkeyListRecordPtr getLFRecord() const;
 
         /**
          * Interprets the cell data as an LHRecord and returns it.
-         * @returns Pointer to an LHRecord object.
+         * @returns Unique pointer to an LHRecord object.
          * @throws RegistryParseException
          */
         SubkeyListRecord::SubkeyListRecordPtr getLHRecord() const;
 
         /**
          * Interprets the cell data as an RIRecord and returns it.
-         * @returns Pointer to an RIRecord object.
+         * @returns Unique pointer to an RIRecord object.
          * @throws RegistryParseException
          */
         SubkeyListRecord::SubkeyListRecordPtr getRIRecord() const;
 
         /**
          * Interprets the cell data as an LIRecord and returns it.
-         * @returns Pointer to an LIRecord object.
+         * @returns Unique pointer to an LIRecord object.
          * @throws RegistryParseException
          */
-        LIRecord::LIRecordPtr getLIRecord() const;
+        SubkeyListRecord::SubkeyListRecordPtr getLIRecord() const;
 
         /**
          * Interprets the cell data as an DBRecord and returns it.
-         * @returns Pointer to an DBRecord object.
+         * @returns Unique pointer to an DBRecord object.
          * @throws RegistryParseException
          */
         DBRecord::DBRecordPtr getDBRecord() const;
 
         /**
          * Interprets the cell data as an DBIndirectRecord and returns it.
-         * @returns Pointer to an DBIndirectRecord object.
+         * @returns Unique pointer to an DBIndirectRecord object.
          * @throws RegistryParseException
          */
         DBIndirectRecord::DBIndirectRecordPtr getDBIndirectRecord() const;
@@ -184,15 +184,14 @@ namespace Rejistry {
          * Interprets the cell data as an ValueListRecord and returns it.
          * @param numValues The number of values the value list should attempt
          * to parse.
-         * @returns Pointer to an ValueListRecord object. The caller is responsible
-         * for freeing the returned record.
+         * @returns Unique pointer to a ValueListRecord object.
          * @throws RegistryParseException
          */
         ValueListRecord::ValueListRecordPtr getValueListRecord(const uint32_t numValues) const;
 
         /**
          * Interprets the cell data as a SubkeyList and returns it.
-         * @returns Pointer to an SubkeyList object.
+         * @returns Unique pointer to an SubkeyList object (do not need to free)
          * @throws RegistryParseException
          */
         SubkeyListRecord::SubkeyListRecordPtr getSubkeyList() const;

rejistry++/src/DBIndirectRecord.cpp

@@ -52,7 +52,9 @@ namespace Rejistry {
             }
 
             std::vector<uint8_t> cellData = c->getData();
-            
+            if (cellData.size() < size) {
+                throw RegistryParseException("DB indirect cell too small for requested data.");
+            }
             data.insert(data.end(), cellData.begin(), cellData.begin() + size);
 
             length -= size;

rejistry++/src/DBIndirectRecord.h

@@ -29,6 +29,7 @@
 #define _REJISTRY_DBINDIRECTRECORD_H
 
 #include <cstdint>
+#include <memory>
 #include <string>
 
 // Local includes
@@ -41,7 +42,7 @@ namespace Rejistry {
      */
     class DBIndirectRecord : public Record {
     public:
-        typedef DBIndirectRecord * DBIndirectRecordPtr;
+        typedef std::unique_ptr<DBIndirectRecord> DBIndirectRecordPtr;
 
         DBIndirectRecord(RegistryByteBuffer * buf, uint32_t offset) : Record(buf, offset) {}
 

rejistry++/src/DBRecord.cpp

@@ -51,7 +51,7 @@ namespace Rejistry {
             throw RegistryParseException("Failed to create Cell for DBRecord.");
         }
 
-        std::unique_ptr< DBIndirectRecord > dbi(c->getDBIndirectRecord());
+        auto dbi = c->getDBIndirectRecord();
         return dbi->getData(length);
     }
 

rejistry++/src/DBRecord.h

@@ -29,6 +29,7 @@
 #define _REJISTRY_DBRECORD_H
 
 #include <cstdint>
+#include <memory>
 #include <string>
 
 // Local includes
@@ -41,7 +42,7 @@ namespace Rejistry {
      */
     class DBRecord : public Record {
     public:
-        typedef DBRecord * DBRecordPtr;
+        typedef std::unique_ptr<DBRecord> DBRecordPtr;
 
         DBRecord(RegistryByteBuffer * buf, uint32_t offset);