/* As above, but map read/write.
*/
int
vips_mapfilerw( VipsImage *im )
{
struct stat st;
mode_t m;
assert( !im->baseaddr );
/* Check the size of the file if it is less than 64 bytes return
* make also sure that it is a regular file
*/
g_assert( im->file_length > 0 );
if( fstat( im->fd, &st ) == -1 ) {
vips_error( "vips_mapfilerw",
"%s", _( "unable to get file status" ) );
return( -1 );
}
m = (mode_t) st.st_mode;
if( im->file_length < 64 || !S_ISREG( m ) ) {
vips_error( "vips_mapfile",
"%s", _( "unable to read data" ) );
return( -1 );
}
if( !(im->baseaddr = vips__mmap( im->fd, 1, im->file_length, 0 )) )
return( -1 );
im->length = im->file_length;
return( 0 );
}
static int
read_image( Read *read, VipsImage *out )
{
VipsImage **t = (VipsImage **)
vips_object_local_array( VIPS_OBJECT( out ), 3 );
guint64 length;
void *data;
int fd;
webp_decoder decoder;
/* libwebp makes streaming very hard. We have to read to a full memory
* buffer, then copy to out.
*
* mmap the input file, it's slightly quicker.
*/
t[0] = vips_image_new_buffer();
if( read_header( read, t[0] ) )
return( -1 );
if( vips_image_write_prepare( t[0] ) )
return( -1 );
if( !(fd = vips__open_image_read( read->filename )) )
return( -1 );
if( (length = vips_file_length( fd )) < 0 ) {
vips_tracked_close( fd );
return( -1 );
}
if( !(data = vips__mmap( fd, FALSE, length, 0 )) ) {
vips_tracked_close( fd );
return( -1 );
}
if( t[0]->Bands == 3 )
decoder = WebPDecodeRGBInto;
else
decoder = WebPDecodeRGBAInto;
if( !decoder( (uint8_t *) data, length,
VIPS_IMAGE_ADDR( t[0], 0, 0 ),
VIPS_IMAGE_SIZEOF_IMAGE( t[0] ),
VIPS_IMAGE_SIZEOF_LINE( t[0] ) ) ) {
vips__munmap( data, length );
vips_tracked_close( fd );
vips_error( "webp2vips", "%s", _( "unable to read pixels" ) );
return( -1 );
}
vips__munmap( data, length );
vips_tracked_close( fd );
if( vips_image_write( t[0], out ) )
return( -1 );
return( 0 );
}
/* Map a window into a file.
*/
static int
vips_window_set( VipsWindow *window, int top, int height )
{
int pagesize = vips_getpagesize();
void *baseaddr;
gint64 start, end, pagestart;
size_t length, pagelength;
/* Calculate start and length for our window.
*/
start = window->im->sizeof_header +
VIPS_IMAGE_SIZEOF_LINE( window->im ) * top;
length = VIPS_IMAGE_SIZEOF_LINE( window->im ) * height;
pagestart = start - start % pagesize;
end = start + length;
pagelength = end - pagestart;
/* Make sure we have enough file.
*/
if( end > window->im->file_length ) {
vips_error( "vips_window_set",
_( "unable to read data for \"%s\", %s" ),
window->im->filename, _( "file has been truncated" ) );
return( -1 );
}
if( !(baseaddr = vips__mmap( window->im->fd,
0, pagelength, pagestart )) )
return( -1 );
window->baseaddr = baseaddr;
window->length = pagelength;
window->data = (VipsPel *) baseaddr + (start - pagestart);
window->top = top;
window->height = height;
/* Sanity check ... make sure the data pointer is readable.
*/
vips__read_test &= window->data[0];
#ifdef DEBUG_TOTAL
g_mutex_lock( vips__global_lock );
total_mmap_usage += window->length;
if( total_mmap_usage > max_mmap_usage )
max_mmap_usage = total_mmap_usage;
g_mutex_unlock( vips__global_lock );
trace_mmap_usage();
#endif /*DEBUG_TOTAL*/
return( 0 );
}
static Read *
read_new( const char *filename, void *data, size_t length )
{
Read *read;
if( !(read = VIPS_NEW( NULL, Read )) )
return( NULL );
read->filename = g_strdup( filename );
read->data = data;
read->length = length;
read->fd = 0;
read->idec = NULL;
if( read->filename ) {
/* libwebp makes streaming from a file source very hard. We
* have to read to a full memory buffer, then copy to out.
*
* mmap the input file, it's slightly quicker.
*/
if( (read->fd = vips__open_image_read( read->filename )) < 0 ||
(read->length = vips_file_length( read->fd )) < 0 ||
!(read->data = vips__mmap( read->fd,
FALSE, read->length, 0 )) ) {
read_free( read );
return( NULL );
}
}
WebPInitDecoderConfig( &read->config );
if( WebPGetFeatures( read->data, MINIMAL_HEADER,
&read->config.input ) != VP8_STATUS_OK ) {
read_free( read );
return( NULL );
}
if( read->config.input.has_alpha )
read->config.output.colorspace = MODE_RGBA;
else
read->config.output.colorspace = MODE_RGB;
read->config.options.use_threads = TRUE;
return( read );
}
int
vips_mapfile( VipsImage *im )
{
struct stat st;
mode_t m;
assert( !im->baseaddr );
/* Check the size of the file; if it is less than 64 bytes, then flag
* an error, we won't be able to read the vips header without a segv.
*/
g_assert( im->file_length > 0 );
if( im->file_length < 64 ) {
vips_error( "vips_mapfile",
"%s", _( "file is less than 64 bytes" ) );
return( -1 );
}
if( fstat( im->fd, &st ) == -1 ) {
vips_error( "vips_mapfile",
"%s", _( "unable to get file status" ) );
return( -1 );
}
m = (mode_t) st.st_mode;
if( !S_ISREG( m ) ) {
vips_error( "vips_mapfile",
"%s", _( "not a regular file" ) );
return( -1 );
}
if( !(im->baseaddr = vips__mmap( im->fd, 0, im->file_length, 0 )) )
return( -1 );
im->length = im->file_length;
return( 0 );
}
static Read *
read_new( const char *filename, const void *data, size_t length, int shrink )
{
Read *read;
if( !(read = VIPS_NEW( NULL, Read )) )
return( NULL );
read->filename = g_strdup( filename );
read->data = data;
read->length = length;
read->shrink = shrink;
read->fd = 0;
read->idec = NULL;
if( read->filename ) {
/* libwebp makes streaming from a file source very hard. We
* have to read to a full memory buffer, then copy to out.
*
* mmap the input file, it's slightly quicker.
*/
if( (read->fd = vips__open_image_read( read->filename )) < 0 ||
(read->length = vips_file_length( read->fd )) < 0 ||
!(read->data = vips__mmap( read->fd,
FALSE, read->length, 0 )) ) {
read_free( read );
return( NULL );
}
}
WebPInitDecoderConfig( &read->config );
if( WebPGetFeatures( read->data, MINIMAL_HEADER,
&read->config.input ) != VP8_STATUS_OK ) {
read_free( read );
return( NULL );
}
if( read->config.input.has_alpha )
read->config.output.colorspace = MODE_RGBA;
else
read->config.output.colorspace = MODE_RGB;
read->config.options.use_threads = 1;
read->width = read->config.input.width / read->shrink;
read->height = read->config.input.height / read->shrink;
if( read->width == 0 ||
read->height == 0 ) {
vips_error( "webp", "%s", _( "bad setting for shrink" ) );
return( NULL );
}
if( read->shrink > 1 ) {
read->config.options.use_scaling = 1;
read->config.options.scaled_width = read->width;
read->config.options.scaled_height = read->height;
}
return( read );
}
