com.openhtmltopdf.util

Class SVGUriDetector

java.lang.Object

com.openhtmltopdf.util.SVGUriDetector

public class SVGUriDetector
extends Object

Decides whether a resource is an SVG image, so that it can be handed to the SVG drawer rather than to the raster image decoder.

SVG images arrive in a lot of shapes: as a linked .svg file, as a base 64 encoded data URI and as a plain (percent encoded) data URI, the latter being the form typically used for small inline images in CSS.

Method Summary

Modifier and Type	Method and Description
static boolean	isSvgDataUri(String uri) Returns true if the URI is a data URI carrying an SVG image, no matter whether the content is base 64 encoded or percent encoded.
static boolean	isSvgUri(String uri) Returns true if the URI names an SVG image, either by media type (data URIs) or by file extension.
static boolean	looksLikeSvgContent(byte[] content) Returns true if the content looks like an SVG document.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

isSvgDataUri

public static boolean isSvgDataUri(String uri)

Returns true if the URI is a data URI carrying an SVG image, no matter whether the content is base 64 encoded or percent encoded.

isSvgUri

public static boolean isSvgUri(String uri)

Returns true if the URI names an SVG image, either by media type (data URIs) or by file extension. A query string or fragment is ignored, so that logo.svg?v=2 is recognized too.

looksLikeSvgContent

public static boolean looksLikeSvgContent(byte[] content)

Returns true if the content looks like an SVG document. Used for resources whose URI gives nothing away, such as an image served by a script.

Only XML that actually contains an svg element near the start is accepted, so this can not mistake a raster image for an SVG: those never start with a <.