Provide dealloc function to sansapatcher.

Similar as done with ipodpatcher provide a function to free the allocated
sector buffer.

Change-Id: Ie51e82f7191496bb48973148af1cc35cd37993d3

rbutil/rbutilqt/base/autodetection.cpp

@@ -185,8 +185,7 @@ bool Autodetection::detect()
     else {
         qDebug() << "[Autodetect] sansapatcher: no Sansa found." << n;
     }
-    free(sansa.sectorbuf);
-    sansa.sectorbuf = NULL;
+    sansa_dealloc_buffer(&sansa);
 
     if(m_mountpoint.isEmpty() && m_device.isEmpty()
             && m_errdev.isEmpty() && m_incompat.isEmpty())

rbutil/rbutilqt/base/bootloaderinstallsansa.cpp

@@ -36,8 +36,7 @@ BootloaderInstallSansa::BootloaderInstallSansa(QObject *parent)
 BootloaderInstallSansa::~BootloaderInstallSansa()
 {
     if(sansa.sectorbuf) {
-        free(sansa.sectorbuf);
-        sansa.sectorbuf = NULL;
+        sansa_dealloc_buffer(&sansa);
     }
 }
 

rbutil/sansapatcher/main.c

@@ -404,6 +404,7 @@ int main(int argc, char* argv[])
     }
 
     sansa_close(&sansa);
+    sansa_dealloc_buffer(&sansa);
 
     if (action==INTERACTIVE) {
         printf("Press ENTER to exit sansapatcher :");

rbutil/sansapatcher/sansaio-posix.c

@@ -122,6 +122,16 @@ int sansa_alloc_buffer(struct sansa_t *sansa, int bufsize)
     return 0;
 }
 
+int sansa_dealloc_buffer(struct sansa_t* sansa)
+{
+    if (sansa->sectorbuf == NULL) {
+        return -1;
+    }
+    free(sansa->sectorbuf);
+    sansa->sectorbuf = NULL;
+    return 0;
+}
+
 int sansa_seek(struct sansa_t* sansa, loff_t pos)
 {
     off_t res;

rbutil/sansapatcher/sansaio-win32.c

@@ -162,6 +162,19 @@ int sansa_alloc_buffer(struct sansa_t* sansa, int bufsize)
     return 0;
 }
 
+int sansa_dealloc_buffer(struct sansa_t* sansa)
+{
+    if (sansa->sectorbuf == NULL) {
+        return -1;
+    }
+    if(!VirtualFree(sansa->sectorbuf, 0, MEM_RELEASE)) {
+        sansa_print_error(" Error releasing buffer ");
+        return -1;
+    }
+    sansa->sectorbuf = NULL;
+    return 0;
+}
+
 int sansa_seek(struct sansa_t* sansa, loff_t pos)
 {
     LARGE_INTEGER li;

rbutil/sansapatcher/sansaio.h

@@ -80,6 +80,7 @@ int sansa_seek(struct sansa_t* sansa, loff_t pos);
 int sansa_read(struct sansa_t* sansa, unsigned char* buf, int nbytes);
 int sansa_write(struct sansa_t* sansa, int nbytes);
 int sansa_alloc_buffer(struct sansa_t* sansa, int bufsize);
+int sansa_dealloc_buffer(struct sansa_t* sansa);
 
 #ifdef __cplusplus
 }