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// Copyright (c) 2015 Ryan Prichard
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
// Encode every code-point using this module and verify that it matches the
// encoding generated using Windows WideCharToMultiByte.
#include "UnicodeEncoding.h"
#include <windows.h>
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
static void correctnessByCode()
{
char mbstr1[4];
char mbstr2[4];
wchar_t wch[2];
for (unsigned int code = 0; code < 0x110000; ++code) {
// Surrogate pair reserved region.
const bool isReserved = (code >= 0xD800 && code <= 0xDFFF);
int mblen1 = encodeUtf8(mbstr1, code);
if (isReserved ? mblen1 != 0 : mblen1 <= 0) {
printf("Error: 0x%04X: mblen1=%d\n", code, mblen1);
continue;
}
int wlen = encodeUtf16(wch, code);
if (isReserved ? wlen != 0 : wlen <= 0) {
printf("Error: 0x%04X: wlen=%d\n", code, wlen);
continue;
}
if (isReserved) {
continue;
}
if (mblen1 != utf8CharLength(mbstr1[0])) {
printf("Error: 0x%04X: mblen1=%d, utf8CharLength(mbstr1[0])=%d\n",
code, mblen1, utf8CharLength(mbstr1[0]));
continue;
}
if (code != decodeUtf8(mbstr1)) {
printf("Error: 0x%04X: decodeUtf8(mbstr1)=%u\n",
code, decodeUtf8(mbstr1));
continue;
}
int mblen2 = WideCharToMultiByte(CP_UTF8, 0, wch, wlen, mbstr2, 4, NULL, NULL);
if (mblen1 != mblen2) {
printf("Error: 0x%04X: mblen1=%d, mblen2=%d\n", code, mblen1, mblen2);
continue;
}
if (memcmp(mbstr1, mbstr2, mblen1) != 0) {
printf("Error: 0x%04x: encodings are different\n", code);
continue;
}
}
}
static const char *encodingStr(char (&output)[128], char (&buf)[4])
{
sprintf(output, "Encoding %02X %02X %02X %02X",
static_cast<uint8_t>(buf[0]),
static_cast<uint8_t>(buf[1]),
static_cast<uint8_t>(buf[2]),
static_cast<uint8_t>(buf[3]));
return output;
}
// This test can take a couple of minutes to run.
static void correctnessByUtf8Encoding()
{
for (uint64_t encoding = 0; encoding <= 0xFFFFFFFF; ++encoding) {
char mb[4];
mb[0] = encoding;
mb[1] = encoding >> 8;
mb[2] = encoding >> 16;
mb[3] = encoding >> 24;
const int mblen = utf8CharLength(mb[0]);
if (mblen == 0) {
continue;
}
// Test this module.
const uint32_t code1 = decodeUtf8(mb);
wchar_t ws1[2] = {};
const int wslen1 = encodeUtf16(ws1, code1);
// Test using Windows. We can't decode a codepoint directly; we have
// to do UTF8->UTF16, then decode the surrogate pair.
wchar_t ws2[2] = {};
const int wslen2 = MultiByteToWideChar(
CP_UTF8, MB_ERR_INVALID_CHARS, mb, mblen, ws2, 2);
const uint32_t code2 =
(wslen2 == 1 ? ws2[0] :
wslen2 == 2 ? decodeSurrogatePair(ws2[0], ws2[1]) :
static_cast<uint32_t>(-1));
// Verify that the two implementations match.
char prefix[128];
if (code1 != code2) {
printf("%s: code1=0x%04x code2=0x%04x\n",
encodingStr(prefix, mb),
code1, code2);
continue;
}
if (wslen1 != wslen2) {
printf("%s: wslen1=%d wslen2=%d\n",
encodingStr(prefix, mb),
wslen1, wslen2);
continue;
}
if (memcmp(ws1, ws2, wslen1 * sizeof(wchar_t)) != 0) {
printf("%s: ws1 != ws2\n", encodingStr(prefix, mb));
continue;
}
}
}
wchar_t g_wch_TEST[] = { 0xD840, 0xDC00 };
char g_ch_TEST[4];
wchar_t *volatile g_pwch = g_wch_TEST;
char *volatile g_pch = g_ch_TEST;
unsigned int volatile g_code = 0xA2000;
static void performance()
{
{
clock_t start = clock();
for (long long i = 0; i < 250000000LL; ++i) {
int mblen = WideCharToMultiByte(CP_UTF8, 0, g_pwch, 2, g_pch, 4, NULL, NULL);
assert(mblen == 4);
}
clock_t stop = clock();
printf("%.3fns per char\n", (double)(stop - start) / CLOCKS_PER_SEC * 4.0);
}
{
clock_t start = clock();
for (long long i = 0; i < 3000000000LL; ++i) {
int mblen = encodeUtf8(g_pch, g_code);
assert(mblen == 4);
}
clock_t stop = clock();
printf("%.3fns per char\n", (double)(stop - start) / CLOCKS_PER_SEC / 3.0);
}
}
int main()
{
printf("Testing correctnessByCode...\n");
fflush(stdout);
correctnessByCode();
printf("Testing correctnessByUtf8Encoding... (may take a couple minutes)\n");
fflush(stdout);
correctnessByUtf8Encoding();
printf("Testing performance...\n");
fflush(stdout);
performance();
return 0;
}
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