in commons-fileupload2-core/src/main/java/org/apache/commons/fileupload2/core/AbstractFileUpload.java [380:392]
private int parseEndOfLine(final String headerPart, final int end) {
var index = end;
for (;;) {
final var offset = headerPart.indexOf('\r', index);
if (offset == -1 || offset + 1 >= headerPart.length()) {
throw new IllegalStateException("Expected headers to be terminated by an empty line.");
}
if (headerPart.charAt(offset + 1) == '\n') {
return offset;
}
index = offset + 1;
}
}