Fix three minor memleaks

README.md

@@ -33,7 +33,8 @@ Checkout the latest sources with:
 Then for a debug build:
 
 	$ ./bootstrap.sh
-	$ CFLAGS="-g -Wall" CXXFLAGS="-g -Wall" ./configure --prefix=/home/john/vips --enable-gtk-doc
+	$ CFLAGS="-g -Wall" CXXFLAGS="-g -Wall" \
+		./configure --prefix=/home/john/vips --enable-gtk-doc
 	$ make
 	$ make install
 
@@ -41,6 +42,14 @@ Static analysis with:
 
 	$ cppcheck --force --enable=style . &> cppcheck.log
 
+Leak check:
+
+        $ export G_DEBUG=gc-friendly
+	$ export G_SLICE=always-malloc
+	$ valgrind --suppressions=/home/john/nip2.supp \
+		--leak-check=yes \
+		vips ... > vips-vg.log 2>&1
+
 # Dependencies 
 
 libvips has to have gettext, glib-2.x and libxml-2.0. The build system needs 

libvips/arithmetic/linear.c

@@ -135,8 +135,8 @@ vips_linear_build( VipsObject *object )
 
 	/* Make up-banded versions of our constants.
 	 */
-	linear->a_ready = g_new( double, linear->n );
-	linear->b_ready = g_new( double, linear->n );
+	linear->a_ready = VIPS_ARRAY( linear, linear->n, double );
+	linear->b_ready = VIPS_ARRAY( linear, linear->n, double );
 
 	for( i = 0; i < linear->n; i++ ) {
 		if( linear->a ) {

libvips/foreign/jpeg2vips.c

@@ -164,9 +164,6 @@ readjpeg_free( ReadJpeg *jpeg )
 
 	result = 0;
 
-	if( setjmp( jpeg->eman.jmp ) ) 
-		return( -1 );
-
 	if( jpeg->eman.pub.num_warnings != 0 ) {
 		if( jpeg->fail ) {
 			vips_error( "VipsJpeg", "%s", vips_error_buffer() );
@@ -185,13 +182,20 @@ readjpeg_free( ReadJpeg *jpeg )
 	}
 
 	if( jpeg->decompressing ) {
-		jpeg_finish_decompress( &jpeg->cinfo );
+		/* jpeg_finish_decompress() can fail ... catch any errors.
+		 */
+		if( !setjmp( jpeg->eman.jmp ) ) 
+			jpeg_finish_decompress( &jpeg->cinfo );
+
 		jpeg->decompressing = FALSE;
 	}
 
 	VIPS_FREEF( fclose, jpeg->eman.fp );
 	VIPS_FREE( jpeg->filename );
 	jpeg->eman.fp = NULL;
+
+	/* I don't think this can fail.
+	 */
 	jpeg_destroy_decompress( &jpeg->cinfo );
 
 	return( result );
@@ -210,6 +214,7 @@ readjpeg_new( VipsImage *out, int shrink, gboolean fail )
 
 	if( !(jpeg = VIPS_NEW( out, ReadJpeg )) )
 		return( NULL );
+
 	jpeg->out = out;
 	jpeg->shrink = shrink;
 	jpeg->fail = fail;

libvips/foreign/jpegsave.c

@@ -237,8 +237,8 @@ vips_foreign_save_jpeg_buffer_build( VipsObject *object )
 		return( -1 );
 
 	area = vips_area_new_blob( (VipsCallbackFn) vips_free, obuf, olen );
-
 	g_object_set( file, "buffer", area, NULL );
+	vips_area_unref( area );
 
 	return( 0 );
 }

libvips/include/vips/internal.h

@@ -90,6 +90,8 @@ extern gboolean vips__cache_trace;
 
 void vips__cache_init( void );
 
+void vips__type_leak( void );
+
 typedef int (*im__fftproc_fn)( VipsImage *, VipsImage *, VipsImage * );
 
 /* iofuncs

libvips/iofuncs/init.c

@@ -327,6 +327,8 @@ vips_leak( void )
 	vips_buf_appends( &buf, "\n" );
 
 	fprintf( stderr, "%s", vips_buf_all( &buf ) );
+
+	vips__type_leak();
 }
 
 /**

libvips/iofuncs/type.c

@@ -142,7 +142,7 @@ vips_thing_get_type( void )
  */
 
 #ifdef DEBUG
-static int vips_area_number = 0;
+static GSList *vips_area_all = NULL;
 #endif /*DEBUG*/
 
 VipsArea *
@@ -174,6 +174,7 @@ vips_area_unref( VipsArea *area )
 
 #ifdef DEBUG
 	printf( "vips_area_unref: %p count = %d\n", area, area->count );
+	g_assert( g_slist_find( vips_area_all, area ) ); 
 #endif /*DEBUG*/
 
 	if( area->count == 0 ) {
@@ -190,9 +191,9 @@ vips_area_unref( VipsArea *area )
 		g_free( area );
 
 #ifdef DEBUG
-		vips_area_number -= 1;
+		vips_area_all = g_slist_remove( vips_area_all, area ); 
 		printf( "vips_area_unref: free .. total = %d\n", 
-			vips_area_number );
+			g_slist_length( vips_area_all ) );
 #endif /*DEBUG*/
 	}
 	else
@@ -226,14 +227,33 @@ vips_area_new( VipsCallbackFn free_fn, void *data )
 	area->sizeof_type = 0;
 
 #ifdef DEBUG
-	vips_area_number += 1;
+	vips_area_all = g_slist_prepend( vips_area_all, area ); 
 	printf( "vips_area_new: %p count = %d (%d in total)\n", 
-		area, area->count, vips_area_number );
+		area, area->count, 
+		g_slist_length( vips_area_all ) );
 #endif /*DEBUG*/
 
 	return( area );
 }
 
+void
+vips__type_leak( void )
+{
+#ifdef DEBUG
+	if( vips_area_all ) {
+		GSList *p; 
+
+		printf( "VipsArea leaks:\n" ); 
+		for( p = vips_area_all; p; p = p->next ) {
+			VipsArea *area = (VipsArea *) p->data;
+
+			printf( "\t%p count = %d\n", area, area->count );
+		}
+		printf( "%d in total\n", g_slist_length( vips_area_all ) );
+	}
+#endif /*DEBUG*/
+}
+
 /**
  * vips_area_new_blob: 
  * @free_fn: (scope async): @data will be freed with this function