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add "unlimited" to svgload 

By default librsvg blocks SVGs > 10MB for security. This patch adds an
"unlimited" flag to remove this check.

We have to switch to using gio to get the librsvg API for this This
needs testing on the platforms we support.

We'll also need to bump the min version of librsvg we require in
configure.ac.

See https://github.com/libvips/libvips/issues/1354
This commit is contained in:
John Cupitt 2019-06-28 13:48:18 +01:00
parent 72c103f95a
commit 55e49831b8
2 changed files with 37 additions and 4 deletions
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1
ChangeLog
View File

@ -1,5 +1,6 @@
20/6/19 started 8.9.0
- add vips_image_get/set_array_int()
- add "unlimited" flag to svgload
24/5/19 started 8.8.1
- improve realpath() use on older libc

40
libvips/foreign/svgload.c
View File

@ -14,6 +14,9 @@
* - handle scaling of svg files missing width and height attributes
* 22/3/18 lovell
* - svgload was missing is_a
* 28/6/19
* - add "unlimited"
* - requires us to use the gio API to librsvg
*/
/*
@ -107,6 +110,10 @@ typedef struct _VipsForeignLoadSvg {
*/
double cairo_scale;
/* Allow SVGs of any size.
*/
gboolean unlimited;
RsvgHandle *page;
} VipsForeignLoadSvg;
@ -440,6 +447,13 @@ vips_foreign_load_svg_class_init( VipsForeignLoadSvgClass *class )
G_STRUCT_OFFSET( VipsForeignLoadSvg, scale ),
0.001, 100000.0, 1.0 );
VIPS_ARG_BOOL( class, "unlimited", 23,
_( "Unlimited" ),
_( "Allow SVG of any size" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignLoadSvg, unlimited ),
FALSE );
}
static void
@ -480,14 +494,20 @@ vips_foreign_load_svg_file_header( VipsForeignLoad *load )
{
VipsForeignLoadSvg *svg = (VipsForeignLoadSvg *) load;
VipsForeignLoadSvgFile *file = (VipsForeignLoadSvgFile *) load;
RsvgHandleFlags flags = svg->unlimited ? RSVG_HANDLE_FLAG_UNLIMITED : 0;
GError *error = NULL;
if( !(svg->page = rsvg_handle_new_from_file(
file->filename, &error )) ) {
GFile *gfile;
gfile = g_file_new_for_path( file->filename );
if( !(svg->page = rsvg_handle_new_from_gfile_sync(
gfile, flags, NULL, &error )) ) {
g_object_unref( gfile );
vips_g_error( &error );
return( -1 );
}
g_object_unref( gfile );
VIPS_SETSTR( load->out->filename, file->filename );
@ -558,14 +578,21 @@ vips_foreign_load_svg_buffer_header( VipsForeignLoad *load )
VipsForeignLoadSvg *svg = (VipsForeignLoadSvg *) load;
VipsForeignLoadSvgBuffer *buffer =
(VipsForeignLoadSvgBuffer *) load;
RsvgHandleFlags flags = svg->unlimited ? RSVG_HANDLE_FLAG_UNLIMITED : 0;
GError *error = NULL;
if( !(svg->page = rsvg_handle_new_from_data(
buffer->buf->data, buffer->buf->length, &error )) ) {
GInputStream *gstream;
gstream = g_memory_input_stream_new_from_data(
buffer->buf->data, buffer->buf->length, NULL );
if( !(svg->page = rsvg_handle_new_from_stream_sync(
gstream, NULL, flags, NULL, &error )) ) {
g_object_unref( gstream );
vips_g_error( &error );
return( -1 );
}
g_object_unref( gstream );
return( vips_foreign_load_svg_header( load ) );
}
@ -612,6 +639,7 @@ vips_foreign_load_svg_buffer_init( VipsForeignLoadSvgBuffer *buffer )
*
* * @dpi: %gdouble, render at this DPI
* * @scale: %gdouble, scale render by this factor
* * @unlimited: %gboolean, allow SVGs of any size
*
* Render a SVG file into a VIPS image. Rendering uses the librsvg library
* and should be fast.
@ -622,6 +650,9 @@ vips_foreign_load_svg_buffer_init( VipsForeignLoadSvgBuffer *buffer )
* This function only reads the image header and does not render any pixel
* data. Rendering occurs when pixels are accessed.
*
* SVGs larger than 10MB are normally blocked for security. Set @unlimited to
* allow SVGs of any size.
*
* See also: vips_image_new_from_file().
*
* Returns: 0 on success, -1 on error.
@ -650,6 +681,7 @@ vips_svgload( const char *filename, VipsImage **out, ... )
*
* * @dpi: %gdouble, render at this DPI
* * @scale: %gdouble, scale render by this factor
* * @unlimited: %gboolean, allow SVGs of any size
*
* Read a SVG-formatted memory block into a VIPS image. Exactly as
* vips_svgload(), but read from a memory buffer.