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#include <windows.h>
#include <wininet.h>
#include <libxml/HTMLparser.h>
#include <libxml/HTMLtree.h>
#include <libxml/xpath.h>
#include "data.h"
#include "win.h"
struct InternetFile
{
InternetFile(const wchar_t* url)
{
hi = InternetOpen(L"Episode Browser", INTERNET_OPEN_TYPE_DIRECT, nullptr, nullptr, 0);
if (!hi)
throw Win32Error();
hiUrl = InternetOpenUrl(hi, url,
nullptr, 0, INTERNET_FLAG_NO_UI, 0);
if (!hiUrl) {
DWORD e = GetLastError();
InternetCloseHandle(hi);
throw InternetError(e);
}
}
~InternetFile()
{
InternetCloseHandle(hiUrl);
InternetCloseHandle(hi);
}
DWORD Read(void* buf, DWORD cb)
{
DWORD cbRead;
if (InternetReadFile(hiUrl, buf, cb, &cbRead))
return cbRead;
else
throw InternetError();
}
HINTERNET hi;
HINTERNET hiUrl;
};
template <auto F, typename T>
struct XmlPtr
{
XmlPtr(T v) : v(v)
{
if (!v)
throw std::runtime_error(xmlGetLastError()->message);
}
~XmlPtr() { F(v); }
operator T() { return v; }
T operator ->() { return v; }
private:
T v;
};
using HtmlParserCtxtPtr = XmlPtr<xmlFreeParserCtxt, htmlParserCtxtPtr>;
using HtmlDocPtr = XmlPtr<xmlFreeDoc, htmlDocPtr>;
using XmlXPathContextPtr = XmlPtr<xmlXPathFreeContext, xmlXPathContextPtr>;
using XmlXPathObjectPtr = XmlPtr<xmlXPathFreeObject, xmlXPathObjectPtr>;
static inline void XmlFree(void* p) { xmlFree(p); }
using XmlCharPtr = XmlPtr<XmlFree, xmlChar*>;
template <size_t N>
bool WcharsFromXmlchars(wchar_t (&dst)[N], XmlCharPtr utf8) noexcept
{
/* Truncate if source is larger than destination. */
int lenUtf8 = xmlStrlen(utf8);
utf8[Min(N, static_cast<size_t>(lenUtf8))] = 0;
/* Convert internal representation from UTF-8 to Latin-1,
* which seems to actually convert the string to proper UTF-8
* (???). */
unsigned char lat1[N];
int lenLat1 = N-1;
if (UTF8Toisolat1(lat1, &lenLat1, utf8, &lenUtf8) <= 0)
return false;
lat1[lenLat1] = 0;
/* Write wide string to destination, if it fits. */
char* const src = reinterpret_cast<char*>(lat1);
const int cchNarrow = lenLat1+1;
const int cchWide = MultiByteToWideChar(CP_UTF8, 0, src, cchNarrow, nullptr, 0);
if (static_cast<size_t>(cchWide) > N)
return false;
return MultiByteToWideChar(CP_UTF8, 0, src, cchNarrow, dst, cchWide);
}
void FetchData()
{
LIBXML_TEST_VERSION;
InternetFile inf(L"https://www.detectiveconanworld.com/wiki/Anime");
//InternetFile inf(L"file://C:/Users/John/Desktop/dcw.html");
char buf[1024];
HtmlParserCtxtPtr ctxt = htmlCreatePushParserCtxt(nullptr, nullptr,
buf, sizeof(buf), "https://www.detectiveconanworld.com/wiki/Anime",
XML_CHAR_ENCODING_UTF8);
htmlCtxtUseOptions(ctxt, HTML_PARSE_RECOVER|HTML_PARSE_NOERROR|HTML_PARSE_NOWARNING);
while (const DWORD cbRead = inf.Read(&buf, sizeof(buf))) {
if (!htmlParseChunk(ctxt, buf, cbRead, 0))
throw std::runtime_error(xmlGetLastError()->message);
}
htmlParseChunk(ctxt, buf, 0, 1); /* Stop parsing. */
/* Find table rows containing episode data. */
HtmlDocPtr doc = ctxt->myDoc;
XmlXPathContextPtr xpathCtx = xmlXPathNewContext(doc);
XmlXPathObjectPtr xpathObj = xmlXPathEvalExpression(
reinterpret_cast<const xmlChar*>("//tr[./td[1] != '' and ./td[3][@style='background:#f2fde9;']]"),
xpathCtx);
xmlNodeSetPtr nodes = xpathObj->nodesetval;
int cNodes = nodes? nodes->nodeNr: 0;
if (!cNodes)
throw std::runtime_error("could not find remote episode information");
for (int i = 0; i < cNodes; i++) {
extern FileView<ElvDataA> g_fvElv;
extern FileView<DlvDataA> g_fvDlv;
const xmlNodePtr node = nodes->nodeTab[i];
if (xmlChildElementCount(node) != 8)
throw std::runtime_error("unexpected remote data format");
ElvDataA& e = g_fvElv.At(i);
DlvDataA& d = g_fvDlv.At(i);
/* Get cells. */
const xmlNodePtr nodeEp = xmlFirstElementChild(node);
const xmlNodePtr nodeTitle = xmlNextElementSibling(xmlNextElementSibling(nodeEp));
const xmlNodePtr nodeDate = xmlNextElementSibling(nodeTitle);
const xmlNodePtr nodeSource = xmlNextElementSibling(
xmlNextElementSibling(xmlNextElementSibling(nodeDate)));
const xmlNodePtr nodeHint = xmlNextElementSibling(nodeSource);
WcharsFromXmlchars(e.siEp, xmlNodeGetContent(nodeEp));
e.siEp[wcscspn(e.siEp, L"W")] = 0; /* Remove WPS suffix. */
WcharsFromXmlchars(e.title, xmlNodeGetContent(nodeTitle));
WcharsFromXmlchars(d.date, xmlNodeGetContent(nodeDate));
WcharsFromXmlchars(d.source, xmlNodeGetContent(nodeSource));
WcharsFromXmlchars(d.hint, xmlNodeGetContent(nodeHint));
/* Get wiki URL. */
const xmlNodePtr nodeLink = xmlFirstElementChild(nodeTitle);
if (nodeLink)
WcharsFromXmlchars(d.wiki,
xmlGetProp(nodeLink, reinterpret_cast<const xmlChar*>("href")));
}
}
void WaitFetchData(bool* bDone) noexcept
{
try {
FetchData();
*bDone = true;
} catch (...) {
*bDone = true;
ShowException(L"Remote data could not be fetched due to an error: %s", L"Error", MB_ICONWARNING);
}
}
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