Add support for reading 64-bit floats split across multiple buffers. Fixes #8

Author: jakewins

lib/internal/buf.js

@@ -473,6 +473,14 @@ class CombinedBuffer extends BaseBuffer {
       }
     };
   };
+
+  getFloat64 ( position ) {
+    // At some point, a more efficient impl. For now, we copy the 8 bytes
+    // we want to read and depend on the platform impl of IEEE 754.
+    let b = alloc(8);
+    for (var i = 0; i < 8; i++) { b.putUInt8(i, this.getUInt8( position + i )); };
+    return b.getFloat64(0);
+  }
 }
 
 /**

test/internal/buf.test.js

@@ -100,6 +100,20 @@ describe('CombinedBuffer', function() {
     expect(first).toBe(1);
     expect(second).toBe(2);
   });
+
+  it('should read divided float64', function() {
+    // Given
+    var inner = alloc(8);
+    inner.putFloat64(0, 0.1);
+
+    var b = new CombinedBuffer([inner.readSlice(4),inner.readSlice(4)]);
+    
+    // When
+    var read = b.readFloat64();
+
+    // Then
+    expect(read).toBe(0.1);
+  });
 });
 
 function writeString(b, str) {