GapBuffer takes separate buffer_size and size parameters

src/core/Buffer.cc

@@ -57,6 +57,7 @@ bool Buffer::load_from_file(const char * filename)
     size_t loaded_size;
     text_loader.load_buffer(buffer, file_size, &loaded_size);
 
+    m_gap_buffer = std::make_shared<GapBuffer>(buffer, buffer_size, loaded_size);
     m_eol_at_eof = text_loader.get_eol_at_eof();
 
     return true;

src/core/GapBuffer.cc

@@ -4,16 +4,18 @@
 GapBuffer::GapBuffer()
 {
     m_buffer = (uint8_t *)System::alloc_pages(1u);
-    m_size = System::page_size;
+    m_buffer_size = System::page_size;
+    m_size = 0u;
 }
 
-GapBuffer::GapBuffer(uint8_t * buffer, size_t size)
+GapBuffer::GapBuffer(uint8_t * buffer, size_t buffer_size, size_t size)
 {
     m_buffer = buffer;
+    m_buffer_size = buffer_size;
     m_size = size;
 }
 
 GapBuffer::~GapBuffer()
 {
-    System::free_pages(m_buffer, m_size >> System::page_size_log);
+    System::free_pages(m_buffer, m_buffer_size >> System::page_size_log);
 }

src/core/GapBuffer.h

@@ -8,11 +8,12 @@ class GapBuffer
 {
 public:
     GapBuffer();
-    GapBuffer(uint8_t * buffer, size_t size);
+    GapBuffer(uint8_t * buffer, size_t buffer_size, size_t size);
     ~GapBuffer();
 
 protected:
     uint8_t * m_buffer;
+    size_t m_buffer_size;
     size_t m_size;
 };