use expat for xml read
we were using libxml for xml load, use expat instead, we get it for free with glib
This commit is contained in:
John Cupitt
parent
dc2b567ee2
commit
134ce0560c
@ -34,6 +34,8 @@
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- vips_region_shrink() knows about alpha, helps dzsave and tiffsave
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- vips_sequential() no longer stalls ahead threads, instead we constrain sinks
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more tightly ... this makes seq more versatile and more reliable
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- use expat, not libxml, for XML load ... removes a required dependency, since
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we get expat as part of glib
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8/12/16 started 8.4.5
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- allow libgsf-1.14.26 to help centos, thanks tdiprima
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@ -77,14 +77,6 @@ extern "C" {
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*/
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#define VIPS_META_ICC_NAME "icc-profile-data"
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/**
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* VIPS_META_XML:
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*
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* The original XML that was used to code the metadata after reading a VIPS
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* format file.
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*/
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#define VIPS_META_XML "xml-header"
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/**
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* VIPS_META_IMAGEDESCRIPTION:
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*
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@ -17,6 +17,8 @@
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* image.c ... this file now just does read / write to disc
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* 28/3/11
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* - moved to vips_ namespace
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* 25/2/17
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* - use expat for xml read
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*/
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/*
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@ -435,9 +437,9 @@ vips__read_extension_block( VipsImage *im, int *size )
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psize = image_pixel_length( im );
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g_assert( im->file_length > 0 );
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if( im->file_length - psize > 10 * 1024 * 1024 ) {
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if( im->file_length - psize > 100 * 1024 * 1024 ) {
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vips_error( "VipsImage",
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"%s", _( "more than a 10 megabytes of XML? "
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"%s", _( "more than 100 megabytes of XML? "
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"sufferin' succotash!" ) );
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return( NULL );
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}
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@ -457,74 +459,108 @@ vips__read_extension_block( VipsImage *im, int *size )
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return( buf );
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}
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/* Read everything after the pixels into memory.
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FIXME ... why can't we use xmlParserInputBufferCreateFd and parse
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directly from the fd rather than having to read the stupid thing into
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memory
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the libxml API docs are impossible to decipher
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*/
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static xmlDoc *
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read_xml( VipsImage *im )
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static int
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parser_read_fd( XML_Parser parser, int fd )
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{
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void *buf;
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int size;
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xmlDoc *doc;
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xmlNode *node;
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const int chunk_size = 1024;
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if( !(buf = vips__read_extension_block( im, &size )) )
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return( NULL );
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if( !(doc = xmlParseMemory( buf, size )) ) {
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vips_free( buf );
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return( NULL );
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}
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vips_free( buf );
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if( !(node = xmlDocGetRootElement( doc )) ||
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!node->nsDef ||
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!vips_isprefix( NAMESPACE, (char *) node->nsDef->href ) ) {
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ssize_t bytes_read;
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do {
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void *buf;
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if( !(buf = XML_GetBuffer( parser, chunk_size )) ) {
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vips_error( "VipsImage",
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"%s", _( "incorrect namespace in XML" ) );
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xmlFreeDoc( doc );
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return( NULL );
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"%s", _( "unable to allocate read buffer" ) );
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return( -1 );
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}
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bytes_read = read( fd, buf, chunk_size );
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if( bytes_read == (ssize_t) -1 ) {
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vips_error( "VipsImage",
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"%s", _( "read error while fetching XML" ) );
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return( -1 );
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}
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if( !XML_ParseBuffer( parser, bytes_read, bytes_read == 0 ) ) {
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vips_error( "VipsImage",
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"%s", _( "XML parse error" ) );
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return( -1 );
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}
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} while( bytes_read > 0 );
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return( 0 );
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}
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#define MAX_PARSE_ATTR (256)
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/* What we track during expat parse.
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*/
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typedef struct _VipsExpatParse {
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VipsImage *image;
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/* TRUE for in header section.
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*/
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gboolean header;
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/* For the current node, the type and name.
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*/
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XML_Char type[MAX_PARSE_ATTR];
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XML_Char name[MAX_PARSE_ATTR];
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/* Accumulate data here.
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*/
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char *data;
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size_t current_size;
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gboolean error;
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} VipsExpatParse;
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static void
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parser_element_start_handler( void *user_data,
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const XML_Char *name, const XML_Char **atts )
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{
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VipsExpatParse *vep = (VipsExpatParse *) user_data;
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const XML_Char **p;
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#ifdef DEBUG
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printf( "read_xml: namespace == %s\n", node->nsDef->href );
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printf( "parser_element_start: %s\n", name );
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for( p = atts; *p; p += 2 )
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printf( "%s = %s\n", p[0], p[1] );
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#endif /*DEBUG*/
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return( doc );
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if( strcmp( name, "field" ) == 0 ) {
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for( p = atts; *p; p += 2 ) {
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if( strcmp( p[0], "name" ) == 0 )
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vips_strncpy( vep->name, p[1], MAX_PARSE_ATTR );
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if( strcmp( p[0], "type" ) == 0 )
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vips_strncpy( vep->type, p[1], MAX_PARSE_ATTR );
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}
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/* Find the first child node with a name.
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*/
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static xmlNode *
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get_node( xmlNode *base, const char *name )
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{
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xmlNode *i;
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for( i = base->children; i; i = i->next )
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if( strcmp( (char *) i->name, name ) == 0 )
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return( i );
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return( NULL );
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vep->current_size = 0;
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}
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else if( strcmp( name, "header" ) == 0 )
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vep->header = TRUE;
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else if( strcmp( name, "meta" ) == 0 )
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vep->header = FALSE;
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else if( strcmp( name, "root" ) == 0 ) {
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for( p = atts; *p; p += 2 )
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if( strcmp( p[0], "xmlns" ) == 0 &&
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!vips_isprefix( NAMESPACE, p[1] ) ) {
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vips_error( "VipsImage", "%s",
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_( "incorrect namespace in XML" ) );
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vep->error = TRUE;
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}
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}
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}
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/* Read a string property to a buffer. TRUE for success.
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*/
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static int
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get_sprop( xmlNode *xnode, const char *name, char *buf, int sz )
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static void
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parser_append( VipsExpatParse *vep, const XML_Char *data, int len )
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{
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char *value = (char *) xmlGetProp( xnode, (xmlChar *) name );
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size_t new_size = vep->current_size + len;
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if( !value )
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return( 0 );
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vips_strncpy( buf, value, sz );
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VIPS_FREEF( xmlFree, value );
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return( 1 );
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vep->data = g_realloc( vep->data, new_size );
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memcpy( vep->data + vep->current_size, data, len );
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vep->current_size = new_size;
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}
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/* Chop history into lines, add each one as a refstring.
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@ -556,119 +592,76 @@ set_history( VipsImage *im, char *history )
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im->history_list = g_slist_reverse( history_list );
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}
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/* Load header fields.
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*/
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static int
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rebuild_header_builtin( VipsImage *im, xmlNode *i )
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set_meta( VipsImage *image, GType gtype, const char *name, const char *data )
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{
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char name[256];
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GValue save_value = { 0 };
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GValue value = { 0 };
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if( get_sprop( i, "name", name, 256 ) ) {
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if( strcmp( name, "Hist" ) == 0 ) {
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char *history;
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g_value_init( &save_value, VIPS_TYPE_SAVE_STRING );
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vips_value_set_save_string( &save_value, data );
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/* Have to take (another) copy, since we need to free
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* with xmlFree().
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*/
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history = (char *) xmlNodeGetContent( i );
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set_history( im, history );
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xmlFree( history );
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}
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g_value_init( &value, gtype );
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if( !g_value_transform( &save_value, &value ) ) {
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g_value_unset( &save_value );
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vips_error( "VipsImage", "%s",
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_( "error transforming from save format" ) );
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return( -1 );
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}
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vips_image_set( image, name, &value );
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g_value_unset( &save_value );
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g_value_unset( &value );
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return( 0 );
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}
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/* Load meta fields.
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*/
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static int
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rebuild_header_meta( VipsImage *im, xmlNode *i )
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static void
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parser_element_end_handler( void *user_data, const XML_Char *name )
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{
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char name[256];
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char type[256];
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VipsExpatParse *vep = (VipsExpatParse *) user_data;
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if( get_sprop( i, "name", name, 256 ) &&
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get_sprop( i, "type", type, 256 ) ) {
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GType gtype = g_type_from_name( type );
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#ifdef DEBUG
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printf( "parser_element_end_handler: %s\n", name );
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#endif /*DEBUG*/
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if( strcmp( name, "field" ) == 0 ) {
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parser_append( vep, "", 1 );
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#ifdef DEBUG
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printf( "parser_element_end_handler: %zd bytes\n",
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vep->current_size );
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#endif /*DEBUG*/
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if( vep->header ) {
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if( strcmp( name, "Hist" ) == 0 )
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set_history( vep->image, vep->data );
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}
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else {
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GType gtype = g_type_from_name( vep->type );
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/* Can we convert from VIPS_SAVE_STRING to type?
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*/
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if( gtype &&
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g_value_type_transformable(
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VIPS_TYPE_SAVE_STRING, gtype ) ) {
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char *content;
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GValue save_value = { 0 };
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GValue value = { 0 };
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content = (char *) xmlNodeGetContent( i );
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g_value_init( &save_value, VIPS_TYPE_SAVE_STRING );
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vips_value_set_save_string( &save_value, content );
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xmlFree( content );
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g_value_init( &value, gtype );
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if( !g_value_transform( &save_value, &value ) ) {
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g_value_unset( &save_value );
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vips_error( "VipsImage",
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"%s", _( "error transforming from "
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"save format" ) );
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return( -1 );
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VIPS_TYPE_SAVE_STRING, gtype ) &&
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set_meta( vep->image,
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gtype, vep->name, vep->data ) )
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vep->error = TRUE;
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}
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vips_image_set( im, name, &value );
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g_value_unset( &save_value );
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g_value_unset( &value );
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}
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}
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return( 0 );
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}
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static xmlDoc *
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get_xml( VipsImage *im )
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static void
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parser_data_handler( void *user_data, const XML_Char *data, int len )
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{
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if( vips_image_get_typeof( im, VIPS_META_XML ) ) {
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xmlDoc *doc;
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VipsExpatParse *vep = (VipsExpatParse *) user_data;
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if( vips_image_get_area( im, VIPS_META_XML, (void *) &doc ) )
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return( NULL );
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#ifdef DEBUG
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printf( "parser_data_handler: %d bytes\n", len );
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#endif /*DEBUG*/
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return( doc );
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}
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return( NULL );
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}
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/* Rebuild header fields that depend on stuff saved in xml.
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*/
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static int
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rebuild_header( VipsImage *im )
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{
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xmlDoc *doc;
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if( (doc = get_xml( im )) ) {
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xmlNode *root;
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xmlNode *block;
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if( !(root = xmlDocGetRootElement( doc )) )
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return( -1 );
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if( (block = get_node( root, "header" )) ) {
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xmlNode *i;
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for( i = block->children; i; i = i->next )
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if( strcmp( (char *) i->name, "field" ) == 0 )
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if( rebuild_header_builtin( im, i ) )
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return( -1 );
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}
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if( (block = get_node( root, "meta" )) ) {
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xmlNode *i;
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for( i = block->children; i; i = i->next )
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if( strcmp( (char *) i->name, "field" ) == 0 )
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if( rebuild_header_meta( im, i ) )
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return( -1 );
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}
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}
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return( 0 );
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parser_append( vep, data, len );
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}
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/* Called at the end of vips open ... get any XML after the pixel data
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@ -677,22 +670,33 @@ rebuild_header( VipsImage *im )
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static int
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readhist( VipsImage *im )
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{
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/* Junk any old xml meta.
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*/
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if( vips_image_get_typeof( im, VIPS_META_XML ) )
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vips_image_set_area( im, VIPS_META_XML, NULL, NULL );
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XML_Parser parser;
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VipsExpatParse vep;
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if( vips__has_extension_block( im ) ) {
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xmlDoc *doc;
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if( !(doc = read_xml( im )) )
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if( vips__seek( im->fd, image_pixel_length( im ) ) )
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return( -1 );
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parser = XML_ParserCreate( "UTF-8" );
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vep.image = im;
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vep.data = NULL;
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vep.current_size = 0;
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vep.error = FALSE;
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XML_SetUserData( parser, &vep );
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XML_SetElementHandler( parser,
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parser_element_start_handler, parser_element_end_handler );
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XML_SetCharacterDataHandler( parser, parser_data_handler );
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if( parser_read_fd( parser, im->fd ) ||
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vep.error ) {
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g_free( vep.data );
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XML_ParserFree( parser );
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return( -1 );
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vips_image_set_area( im, VIPS_META_XML,
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(VipsCallbackFn) xmlFreeDoc, doc );
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}
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if( rebuild_header( im ) )
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return( -1 );
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g_free( vep.data );
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XML_ParserFree( parser );
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return( 0 );
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}
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