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Modify XML encoder to hex-encode invalid UTF-8 sequences

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There are still some holes, e.g. we leave surrogate pairs be
even though they are not a part of valid UTF-8, but this might
be for the better -- WTF-8 does support surrogate pairs inside
text.

Closes #1207
This commit is contained in:
Martin Hořeňovský
2018-03-25 20:44:30 +02:00
parent e11508b48a
commit 3b801c4fda
8 changed files with 923 additions and 39 deletions
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77
projects/SelfTest/IntrospectiveTests/Xml.tests.cpp
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@@ -1,5 +1,4 @@
#include "catch.hpp"
#include "internal/catch_xmlwriter.h"
#include <sstream>
@@ -10,7 +9,7 @@ inline std::string encode( std::string const& str, Catch::XmlEncode::ForWhat for
return oss.str();
}
TEST_CASE( "XmlEncode" ) {
TEST_CASE( "XmlEncode", "[XML]" ) {
SECTION( "normal string" ) {
REQUIRE( encode( "normal string" ) == "normal string" );
}
@@ -38,4 +37,76 @@ TEST_CASE( "XmlEncode" ) {
SECTION( "string with control char (x7F)" ) {
REQUIRE( encode( "[\x7F]" ) == "[\\x7F]" );
}
}
}
// Thanks to Peter Bindels (dascandy) for some of the tests
TEST_CASE("XmlEncode: UTF-8", "[XML][UTF-8]") {
SECTION("Valid utf-8 strings") {
CHECK(encode(u8"Here be 👾") == u8"Here be 👾");
CHECK(encode(u8"šš") == u8"šš");
CHECK(encode("\xDF\xBF") == "\xDF\xBF"); // 0x7FF
CHECK(encode("\xE0\xA0\x80") == "\xE0\xA0\x80"); // 0x800
CHECK(encode("\xED\x9F\xBF") == "\xED\x9F\xBF"); // 0xD7FF
CHECK(encode("\xEE\x80\x80") == "\xEE\x80\x80"); // 0xE000
CHECK(encode("\xEF\xBF\xBF") == "\xEF\xBF\xBF"); // 0xFFFF
CHECK(encode("\xF0\x90\x80\x80") == "\xF0\x90\x80\x80"); // 0x10000
CHECK(encode("\xF4\x8F\xBF\xBF") == "\xF4\x8F\xBF\xBF"); // 0x10FFFF
}
SECTION("Invalid utf-8 strings") {
SECTION("Various broken strings") {
CHECK(encode("Here \xFF be 👾") == u8"Here \\xFF be 👾");
CHECK(encode("\xFF") == "\\xFF");
CHECK(encode("\xC5\xC5\xA0") == u8"\\xC5Š");
CHECK(encode("\xF4\x90\x80\x80") == u8"\\xF4\\x90\\x80\\x80"); // 0x110000 -- out of unicode range
}
SECTION("Overlong encodings") {
CHECK(encode("\xC0\x80") == u8"\\xC0\\x80"); // \0
CHECK(encode("\xF0\x80\x80\x80") == u8"\\xF0\\x80\\x80\\x80"); // Super-over-long \0
CHECK(encode("\xC1\xBF") == u8"\\xC1\\xBF"); // ASCII char as UTF-8 (0x7F)
CHECK(encode("\xE0\x9F\xBF") == u8"\\xE0\\x9F\\xBF"); // 0x7FF
CHECK(encode("\xF0\x8F\xBF\xBF") == u8"\\xF0\\x8F\\xBF\\xBF"); // 0xFFFF
}
// Note that we actually don't modify surrogate pairs, as we do not do strict checking
SECTION("Surrogate pairs") {
CHECK(encode("\xED\xA0\x80") == "\xED\xA0\x80"); // Invalid surrogate half 0xD800
CHECK(encode("\xED\xAF\xBF") == "\xED\xAF\xBF"); // Invalid surrogate half 0xDBFF
CHECK(encode("\xED\xB0\x80") == "\xED\xB0\x80"); // Invalid surrogate half 0xDC00
CHECK(encode("\xED\xBF\xBF") == "\xED\xBF\xBF"); // Invalid surrogate half 0xDFFF
}
SECTION("Invalid start byte") {
CHECK(encode("\x80") == u8"\\x80");
CHECK(encode("\x81") == u8"\\x81");
CHECK(encode("\xBC") == u8"\\xBC");
CHECK(encode("\xBF") == u8"\\xBF");
// Out of range
CHECK(encode("\xF5\x80\x80\x80") == u8"\\xF5\\x80\\x80\\x80");
CHECK(encode("\xF6\x80\x80\x80") == u8"\\xF6\\x80\\x80\\x80");
CHECK(encode("\xF7\x80\x80\x80") == u8"\\xF7\\x80\\x80\\x80");
}
SECTION("Missing continuation byte(s)") {
// Missing first continuation byte
CHECK(encode("\xDE") == u8"\\xDE");
CHECK(encode("\xDF") == u8"\\xDF");
CHECK(encode("\xE0") == u8"\\xE0");
CHECK(encode("\xEF") == u8"\\xEF");
CHECK(encode("\xF0") == u8"\\xF0");
CHECK(encode("\xF4") == u8"\\xF4");
// Missing second continuation byte
CHECK(encode("\xE0\x80") == u8"\\xE0\\x80");
CHECK(encode("\xE0\xBF") == u8"\\xE0\\xBF");
CHECK(encode("\xE1\x80") == u8"\\xE1\\x80");
CHECK(encode("\xF0\x80") == u8"\\xF0\\x80");
CHECK(encode("\xF4\x80") == u8"\\xF4\\x80");
// Missing third continuation byte
CHECK(encode("\xF0\x80\x80") == u8"\\xF0\\x80\\x80");
CHECK(encode("\xF4\x80\x80") == u8"\\xF4\\x80\\x80");
}
}
}