add gcount to fs utils

include/blt/std/filesystem.h

@@ -11,7 +11,8 @@
 #include <ios>
 #include "memory.h"
 
-namespace blt::fs {
+namespace blt::fs
+{
     
     /**
      * A simple interface which provides a way of reading the next block of data from a resource.
@@ -20,12 +21,14 @@ namespace blt::fs {
      * Reading of a large number of bytes ( > block size) is guaranteed to not significantly increase the read time and will likely result in a
      * direct passthrough to the underlying system. Small reads will be buffered, hence the name "block" reader.
      */
-    class block_reader {
+    class block_reader
+    {
         protected:
             // 32768 block size seems the fastest on my system
             unsigned long m_bufferSize;
         public:
-            explicit block_reader(size_t bufferSize): m_bufferSize(bufferSize) {}
+            explicit block_reader(size_t bufferSize): m_bufferSize(bufferSize)
+            {}
             
             /**
              * Reads bytes from the internal filesystem implementation
@@ -34,7 +37,11 @@ namespace blt::fs {
              * @return status code. non-zero return codes indicates a failure has occurred.
              */
             virtual int read(char* buffer, size_t bytes) = 0;
-            virtual char get(){
+            
+            virtual int gcount() = 0;
+            
+            virtual char get()
+            {
                 char c[1];
                 read(c, 1);
                 return c[0];
@@ -44,11 +51,13 @@ namespace blt::fs {
     /**
      * A buffered block writer without a definite backend implementation. Exactly the same as a block_reader but for writing to the filesystem.
      */
-    class block_writer {
+    class block_writer
+    {
         protected:
             unsigned long m_bufferSize;
         public:
-            explicit block_writer(unsigned long bufferSize): m_bufferSize(bufferSize) {}
+            explicit block_writer(unsigned long bufferSize): m_bufferSize(bufferSize)
+            {}
             
             /**
              * Writes the bytes to the filesystem backend implementation
@@ -57,7 +66,9 @@ namespace blt::fs {
              * @return non-zero code if failure
              */
             virtual int write(char* buffer, size_t bytes) = 0;
-            virtual int put(char c){
+            
+            virtual int put(char c)
+            {
                 char a[1];
                 a[0] = c;
                 return write(a, 1);
@@ -72,7 +83,8 @@ namespace blt::fs {
     /**
      * fstream implementation of the block reader.
      */
-    class fstream_block_reader : public block_reader {
+    class fstream_block_reader : public block_reader
+    {
         private:
             std::fstream& m_stream;
             char* m_buffer = nullptr;
@@ -90,20 +102,29 @@ namespace blt::fs {
             
             int read(char* buffer, size_t bytes) override;
             
-            ~fstream_block_reader() {
+            int gcount() final {
+                return m_stream.gcount();
+            }
+            
+            ~fstream_block_reader()
+            {
                 delete[] m_buffer;
             }
     };
     
-    class fstream_block_writer : public block_writer {
+    class fstream_block_writer : public block_writer
+    {
         private:
             std::fstream& m_stream;
             char* m_buffer;
             size_t writeIndex = 0;
+            
             void flush_internal();
+        
         public:
             explicit fstream_block_writer(std::fstream& stream, size_t bufferSize = 131072):
-                    block_writer(bufferSize), m_stream(stream), m_buffer(new char[bufferSize]) {}
+                    block_writer(bufferSize), m_stream(stream), m_buffer(new char[bufferSize])
+            {}
             
             explicit fstream_block_writer(fstream_block_writer& copy) = delete;
             
@@ -114,11 +135,14 @@ namespace blt::fs {
             fstream_block_writer& operator=(const fstream_block_writer&& move) = delete;
             
             int write(char* buffer, size_t bytes) override;
-            inline void flush() override {
+            
+            inline void flush() override
+            {
                 flush_internal();
             }
             
-            ~fstream_block_writer() {
+            ~fstream_block_writer()
+            {
                 flush_internal();
                 delete[] m_buffer;
             }