genesys: fix for computation of total file size exceeding unsigned

Large scans that exceed 32-bits need cast to allow 64-bit size.

backend/genesys/gl124.cpp

@@ -744,7 +744,7 @@ void CommandSetGl124::init_regs_for_scan_session(Genesys_Device* dev, const Gene
     dev->session = session;
 
     dev->total_bytes_read = 0;
-    dev->total_bytes_to_read = session.output_line_bytes_requested * session.params.lines;
+    dev->total_bytes_to_read = (size_t)session.output_line_bytes_requested * (size_t)session.params.lines;
 
     DBG(DBG_info, "%s: total bytes to send to frontend = %zu\n", __func__,
         dev->total_bytes_to_read);

backend/genesys/gl646.cpp

@@ -818,7 +818,8 @@ void CommandSetGl646::init_regs_for_scan_session(Genesys_Device* dev, const Gene
     dev->session = session;
 
     dev->total_bytes_read = 0;
-    dev->total_bytes_to_read = session.output_line_bytes_requested * session.params.lines;
+    dev->total_bytes_to_read = (size_t) session.output_line_bytes_requested
+          * (size_t) session.params.lines;
 
     /* select color filter based on settings */
     regs->find_reg(0x04).value &= ~REG_0x04_FILTER;

backend/genesys/gl841.cpp

@@ -978,7 +978,7 @@ dummy \ scanned lines
     dev->session = session;
 
     dev->total_bytes_read = 0;
-    dev->total_bytes_to_read = session.output_line_bytes_requested * session.params.lines;
+    dev->total_bytes_to_read = (size_t)session.output_line_bytes_requested * (size_t)session.params.lines;
     if (session.use_host_side_gray) {
         dev->total_bytes_to_read /= 3;
     }

backend/genesys/gl842.cpp

@@ -569,7 +569,7 @@ void CommandSetGl842::init_regs_for_scan_session(Genesys_Device* dev, const Gene
     dev->session = session;
 
     dev->total_bytes_read = 0;
-    dev->total_bytes_to_read = session.output_line_bytes_requested * session.params.lines;
+    dev->total_bytes_to_read = (size_t)session.output_line_bytes_requested * (size_t)session.params.lines;
 }
 
 ScanSession CommandSetGl842::calculate_scan_session(const Genesys_Device* dev,

backend/genesys/gl843.cpp

@@ -1042,7 +1042,7 @@ void CommandSetGl843::init_regs_for_scan_session(Genesys_Device* dev, const Gene
     dev->session = session;
 
   dev->total_bytes_read = 0;
-    dev->total_bytes_to_read = session.output_line_bytes_requested * session.params.lines;
+    dev->total_bytes_to_read = (size_t)session.output_line_bytes_requested * (size_t)session.params.lines;
 
     DBG(DBG_info, "%s: total bytes to send = %zu\n", __func__, dev->total_bytes_to_read);
 }

backend/genesys/gl846.cpp

@@ -659,7 +659,7 @@ void CommandSetGl846::init_regs_for_scan_session(Genesys_Device* dev, const Gene
     dev->session = session;
 
     dev->total_bytes_read = 0;
-    dev->total_bytes_to_read = session.output_line_bytes_requested * session.params.lines;
+    dev->total_bytes_to_read = (size_t)session.output_line_bytes_requested * (size_t)session.params.lines;
 
     DBG(DBG_info, "%s: total bytes to send = %zu\n", __func__, dev->total_bytes_to_read);
 }

backend/genesys/gl847.cpp

@@ -625,7 +625,7 @@ void CommandSetGl847::init_regs_for_scan_session(Genesys_Device* dev, const Gene
     dev->session = session;
 
     dev->total_bytes_read = 0;
-    dev->total_bytes_to_read = session.output_line_bytes_requested * session.params.lines;
+    dev->total_bytes_to_read = (size_t)session.output_line_bytes_requested * (size_t)session.params.lines;
 
     DBG(DBG_info, "%s: total bytes to send = %zu\n", __func__, dev->total_bytes_to_read);
 }