Added batch ingest functions for std::vector<char>

dlib/crc32/crc32_kernel_1.h

@@ -5,6 +5,7 @@
 
 #include "../algs.h"
 #include <string>
+#include <vector>
 #include "crc32_kernel_abstract.h"
 
 namespace dlib
@@ -34,6 +35,10 @@ namespace dlib
             const std::string& item
         );
 
+        inline crc32 (
+            const std::vector<char>& item
+        );
+
         inline virtual ~crc32 (
         );
 
@@ -48,6 +53,10 @@ namespace dlib
             const std::string& item
         );
 
+        inline void add (
+            const std::vector<char>& item
+        );
+
         inline unsigned long get_checksum (
         ) const;
 
@@ -124,6 +133,18 @@ namespace dlib
         add(item);
     }
 
+// ----------------------------------------------------------------------------------------
+
+    crc32::
+    crc32 (        
+        const std::vector<char>& item
+    )
+    {
+        checksum = 0xFFFFFFFF;
+        fill_crc_table();
+        add(item);
+    }
+
 // ----------------------------------------------------------------------------------------
 
     crc32::
@@ -162,6 +183,17 @@ namespace dlib
             checksum = (checksum>>8) ^ table[(checksum^item[i]) & 0xFF];
     }
 
+// ----------------------------------------------------------------------------------------
+
+    void crc32::
+    add (
+        const std::vector<char>& item
+    )
+    {
+        for (unsigned long i = 0; i < item.size(); ++i)
+            checksum = (checksum>>8) ^ table[(checksum^item[i]) & 0xFF];
+    }
+
 // ----------------------------------------------------------------------------------------
 
     unsigned long crc32::

dlib/crc32/crc32_kernel_abstract.h

@@ -5,6 +5,7 @@
 
 #include "../algs.h"
 #include <string>
+#include <vector>
 
 namespace dlib
 {
@@ -41,6 +42,17 @@ namespace dlib
                   constructor and then calling add() on item)
         !*/
 
+        crc32 (        
+            const std::vector<char>& item
+        );
+        /*!
+            ensures                
+                - #*this is properly initialized
+                - calls this->add(item).
+                  (i.e. Using this constructor is the same as using the default 
+                  constructor and then calling add() on item)
+        !*/
+
         virtual ~crc32 (
         );
         /*!
@@ -73,6 +85,15 @@ namespace dlib
                   concatenated with item.
         !*/
 
+        void add (
+            const std::vector<char>& item
+        );
+        /*!
+            ensures
+                - #get_checksum() == The checksum of all items added to *this previously
+                  concatenated with item.
+        !*/
+
         unsigned long get_checksum (
         ) const;
         /*!

dlib/test/crc32.cpp

@@ -61,6 +61,11 @@ namespace
             DLIB_TEST(c.get_checksum() == 0);
             c.add("davis");
             DLIB_TEST(c.get_checksum() == 0x0445527C);
+
+            std::vector<char> buf;
+            for (int i = 0; i < 4000; ++i)
+                buf.push_back(i);
+            DLIB_TEST(crc32(buf).get_checksum() == 492662731);
         }
     } a;