ISDb.cpp

#include "stdafx.h"
#include "ISDb.h"
#include "mplayerc.h"

bool hash(LPCTSTR fn, filehash& fh)
{
        CFile f;
        CFileException fe;
        if(!f.Open(fn, CFile::modeRead|CFile::osSequentialScan|CFile::shareDenyNone, &fe))
        return false;

        CPath p(fn);
        p.StripPath();
        fh.name = (LPCTSTR)p;

        fh.size = f.GetLength();
        
        fh.hash = fh.size;
        for(UINT64 tmp = 0, i = 0; i < 65536/sizeof(tmp) && f.Read(&tmp, sizeof(tmp)); fh.hash += tmp, i++);
        f.Seek(max(0, (INT64)fh.size - 65536), CFile::begin);
        for(UINT64 tmp = 0, i = 0; i < 65536/sizeof(tmp) && f.Read(&tmp, sizeof(tmp)); fh.hash += tmp, i++);

        return true;
}

void hash(CPlaylist& pl, CList<filehash>& fhs)
{
        fhs.RemoveAll();

        POSITION pos = pl.GetHeadPosition();
        while(pos)
        {
                CString fn = pl.GetNext(pos).m_fns.GetHead();
                if(AfxGetAppSettings().Formats.FindExt(CPath(fn).GetExtension().MakeLower(), true))
                        continue;

                filehash fh;
                if(!hash(fn, fh))
                        continue;

                fhs.AddTail(fh);
        }
}

CStringA makeargs(CPlaylist& pl)
{
        CList<filehash> fhs;
        hash(pl, fhs);

        CList<CStringA> args;

        POSITION pos = fhs.GetHeadPosition();
        for(int i = 0; pos; i++)
        {
                filehash& fh = fhs.GetNext(pos);

                CStringA str;
                str.Format("name[%d]=%s&size[%d]=%016I64x&hash[%d]=%016I64x",
                        i, UrlEncode(CStringA(fh.name)), 
                        i, fh.size,
                        i, fh.hash);

                args.AddTail(str);
        }

        return Implode(args, '&');
}

bool OpenUrl(CInternetSession& is, CString url, CStringA& str)
{
        str.Empty();

        try
        {
                CAutoPtr<CStdioFile> f(is.OpenURL(url, 1, INTERNET_FLAG_TRANSFER_BINARY|INTERNET_FLAG_EXISTING_CONNECT));

                char buff[1024];
                for(int len; (len = f->Read(buff, sizeof(buff))) > 0; str += CStringA(buff, len));

                f->Close(); // must close it because the desctructor doesn't seem to do it and we will get an exception when "is" is destroying
        }
        catch(CInternetException* ie)
        {
                ie->Delete();
                return false;
        }

        return true;
}

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