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Code Issues Releases Wiki Activity

SVG data URI improvements

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This commit is contained in:
M66B 2024-07-24 07:09:58 +02:00
parent 42a17c3a3d
commit e252b1bcd5
1 changed files with 22 additions and 16 deletions
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38
app/src/main/java/eu/faircode/email/ImageHelper.java
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@ -657,37 +657,43 @@ class ImageHelper {
// "//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU" +
// "5ErkJggg==\" alt=\"Red dot\" />";
// <img src="data:image/svg;utf8,&lt;svg ...
// https://en.wikipedia.org/wiki/Data_URI_scheme
// https://datatracker.ietf.org/doc/html/rfc2397
try {
// data:[<mediatype>][;base64],<data>
int comma = source.indexOf(',');
int colon = source.indexOf(':');
int semi = source.indexOf(';');
if (comma < 0)
throw new IllegalArgumentException("Comma missing");
int colon = source.indexOf(':');
int semi = source.indexOf(';');
String type = null;
if (colon > 0 && semi > colon)
type = source.substring(colon + 1, semi);
type = source.substring(colon + 1, semi).trim();
else if (colon > 0 && comma > colon)
type = source.substring(colon + 1, comma);
String enc = (semi > 0 && comma > semi ? source.substring(semi + 1, comma) : null);
type = source.substring(colon + 1, comma).trim();
String enc = (semi > 0 && comma > semi ? source.substring(semi + 1, comma).trim() : null);
if ("image/svg".equalsIgnoreCase(type) &&
(enc == null || "utf8".equalsIgnoreCase(enc)))
try {
InputStream is = new ByteArrayInputStream(source.substring(comma + 1).getBytes(StandardCharsets.UTF_8));
Bitmap bm = ImageHelper.renderSvg(is, Color.WHITE, 1024);
Helper.ByteArrayInOutStream s = new Helper.ByteArrayInOutStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, s);
return s.getInputStream();
} catch (IOException ex) {
throw new IllegalArgumentException("SVG", ex);
}
(TextUtils.isEmpty(enc) /* ASCII */ || "utf8".equalsIgnoreCase(enc))) {
InputStream is = new ByteArrayInputStream(source.substring(comma + 1).getBytes(StandardCharsets.UTF_8));
Bitmap bm = ImageHelper.renderSvg(is, Color.WHITE, 768);
Helper.ByteArrayInOutStream s = new Helper.ByteArrayInOutStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, s);
return s.getInputStream();
}
if (!"base64".equalsIgnoreCase(enc))
throw new IllegalArgumentException("Unknown encoding");
String base64 = source.substring(comma + 1);
byte[] bytes = Base64.decode(base64.getBytes(), 0);
return new ByteArrayInputStream(bytes);
} catch (IllegalArgumentException ex) {
} catch (Throwable ex) {
String excerpt = source.substring(0, Math.min(100, source.length()));
throw new IllegalArgumentException(excerpt, ex);
}