/*

  * MP3/MPlayer plugin to VDR (C++)

  *

  * (C) 2001-2006 Stefan Huelswitt <s.huelswitt@gmx.de>

  *

  * This code is free software; you can redistribute it and/or

  * modify it under the terms of the GNU General Public License

  * as published by the Free Software Foundation; either version 2

  * of the License, or (at your option) any later version.

  *

  * This code is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License

  * along with this program; if not, write to the Free Software

  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

  * Or, point your browser to http://www.gnu.org/copyleft/gpl.html

  */

 #include <stdlib.h>

 #include <stdio.h>

 #include <unistd.h>

 #include <errno.h>

 #include "common.h"

 #include "setup-mp3.h"

 #include "stream.h"

 #include "network.h"

 #include "menu-async.h"

 #include "i18n.h"

 #include "version.h"

 #define USE_MMAP

 #define MAX_MMAP_SIZE   (32*1024*1024)

 #define MP3FILE_BUFSIZE (32*1024)

 #ifdef USE_MMAP

 #include <sys/mman.h>

 #endif

 #define DEFAULT_PORT 80 // default port for streaming (HTTP)

 //#define DUMP_HEAD "/var/tmp/headers"

 // --- cIO ---------------------------------------------------------------------

 #if 0

 cIO::cIO(const char *Filename, bool Log)

 :cFileInfo(Filename)

 {

   log=Log;

   readpos=0;

 }

 cIO::~cIO()

 {

 }

 // --- cStreamIO ---------------------------------------------------------------

 cStreamIO::cStreamIO(void)

 {

   data=0;

 }

 cStreamIO::~cStreamIO()

 {

   StreamClear(true);

 }

 void cStreamIO::StreamClear(bool all)

 {

   if(all) { free(data); data=0; }

   fill=0;

 }

 unsigned char *cStreamIO::StreamInit(int Size)

 {

   StreamClear(true);

   size=Size; data=(unsigned char *)malloc(size);

   return data;

 }

 int cStreamIO::Stream(const unsigned char *rest)

 {

   if(rest && fill) { // copy remaining data to start of buffer

     fill-=(rest-data);

     memmove(data,rest,fill);

     }

   else fill=0;

   unsigned long r=Read(data+fill,size-fill);

   if(r>=0) { 

     fill+=r;

     return fill;

     }

   return -1;    

 }

 // --- cFileIO -----------------------------------------------------------------

 cFileIO::cFileIO(const char *Filename, bool Log)

 :cIO(Filename,Log)

 {

   fd=-1;

 }

 cFileIO::~cFileIO()

 {

   Close();

 }

 bool cFileIO::Open(void)

 {

   if(fd>=0) return Seek(0,SEEK_SET);

   if(FileInfo(log)) {

     if((fd=open(Filename,O_RDONLY))>=0) {

       StreamClear(false);

       readpos=0;

       return true;

       }

     else if(log) { esyslog("ERROR: open failed on %s: %s",Filename,strerror(errno)); }

     }

   Close();

   return false;

 }

 void cFileIO::Close(void)

 {

   if(fd>=0) { close(fd); fd=-1; }

 }

 int cFileIO::Read(unsigned char *Data, int Size)

 {

   unsigned long r=read(fd,Data,Size);

   if(r>=0) readpos+=r;

   else if(log) { esyslog("ERROR: read failed in %s: %s",Filename,strerror(errno)); }

   return r;

 }

 bool cFileIO::Seek(unsigned long long pos, int whence)

 {

   if(pos>=0 && pos<=Filesize) {

     StreamClear(false);

     if((readpos=lseek64(fd,pos,whence))>=0) {

       if(readpos!=pos) { dsyslog("seek mismatch in %s, wanted %lld, got %lld",Filename,pos,readpos); }

       return true;

       }

     else if(log) { esyslog("ERROR: seek failed in %s: %s",Filename,strerror(errno)); }

     }

   else d(printf("mp3: bad seek call fd=%d pos=%lld name=%s\n",fd,pos,Filename))

   return false;

 }

 #endif

 // --- cStream -----------------------------------------------------------------

 cStream::cStream(const char *Filename)

 :cFileInfo(Filename)

 {

   fd=-1; ismmap=false; buffer=0;

 }

 cStream::~cStream()

 {

   Close();

 }

 bool cStream::Open(bool log)

 {

   if(fd>=0) return Seek();

   if(FileInfo(log)) {

     if((fd=open(Filename,O_RDONLY))>=0) {

       buffpos=readpos=0; fill=0;

 #ifdef USE_MMAP

       if(Filesize<=MAX_MMAP_SIZE) {

         buffer=(unsigned char *)mmap(0,Filesize,PROT_READ,MAP_SHARED,fd,0);

         if(buffer!=MAP_FAILED) {

           ismmap=true;

           return true;

           }

         else dsyslog("mmap() failed for %s: %s",Filename,strerror(errno));

         }

 #endif

         buffer = new unsigned char[MP3FILE_BUFSIZE];

         if(buffer) return true;

         else { esyslog("ERROR: not enough memory for buffer: %s",Filename); }

       }

     else if(log) { esyslog("ERROR: failed to open file %s: %s",Filename,strerror(errno)); }

     }

   Close();

   return false;

 }

 void cStream::Close(void)

 {

 #ifdef USE_MMAP

   if(ismmap) { 

     munmap(buffer,Filesize); buffer=0; ismmap=false;

     }

   else {

 #endif

     delete buffer; buffer=0;

 #ifdef USE_MMAP

     }

 #endif

   if(fd>=0) { close(fd); fd=-1; }

 }

 bool cStream::Seek(unsigned long long pos)

 {

   if(fd>=0 && pos>=0 && pos<=Filesize) {

     buffpos=0; fill=0;

     if(ismmap) {

       readpos=pos;

       return true;

       }

     else {

       if((readpos=lseek64(fd,pos,SEEK_SET))>=0) {

         if(readpos!=pos) { dsyslog("seek mismatch in %s, wanted %lld, got %lld",Filename,pos,readpos); }

         return true;

         }

       else { esyslog("ERROR: seeking failed in %s: %d,%s",Filename,errno,strerror(errno)); }

       }

     }

   else d(printf("mp3: bad seek call fd=%d pos=%lld name=%s\n",fd,pos,Filename))

   return false;

 }

 bool cStream::Stream(unsigned char * &data, unsigned long &len, const unsigned char *rest)

 {

   if(fd>=0) {

     if(readpos<Filesize) {

       if(ismmap) {

         if(rest && fill) readpos=(rest-buffer);   // take care of remaining data

         fill=Filesize-readpos;

         data=buffer+readpos; len=fill;

         buffpos=readpos; readpos+=fill;

         return true;

         }

       else {

         if(rest && fill) {       // copy remaining data to start of buffer

           fill-=(rest-buffer);   // remaing bytes

           memmove(buffer,rest,fill);

           }

         else fill=0;

         int r;

         do { 

           r=read(fd,buffer+fill,MP3FILE_BUFSIZE-fill);

           } while(r==-1 && errno==EINTR);

         if(r>=0) {

           buffpos=readpos-fill; readpos+=r; fill+=r;

           data=buffer; len=fill;

           return true;

           }

         else { esyslog("ERROR: read failed in %s: %d,%s",Filename,errno,strerror(errno)); }

         }

       }

     else {

       len=0;

       return true;

       }

     }

   return false;

 }

 // -----------------------------------------------------------------------------

 #ifdef DUMP_HEAD

 void Dump(const char *name, char *buffer)

 {

   FILE *f=fopen(name,"a");

   if(f) {

     fprintf(f,"<<<< %s\n",buffer);

 /*

     int n=strlen(buffer);

     for(int i=0 ; i<n ; i+=8) {

       fprintf(f,"%04x: ",i);

       for(int l=0 ; l<8 && i+l<n ; l++) fprintf(f,"%02x ",buffer[i+l]);

       fprintf(f,"\n");

       }

 */

     fclose(f);

     }

 }

 #endif

 // --- cNetStream -----------------------------------------------------------------

 cNetStream::cNetStream(const char *Filename)

 :cStream(Filename)

 {

   net=0; host=path=auth=0; cc=0;

   icyName=icyUrl=icyTitle=0; icyChanged=false;

   metaInt=0;

   InfoDone();

 }

 cNetStream::~cNetStream()

 {

   free(host); free(path); free(auth);

   free(icyName); free(icyUrl); free(icyTitle);

 }

 bool cNetStream::ParseURL(const char *line, bool log)

 {

   char pr[32], h[512], p[512], a[512];

   int r=sscanf(line," %31[^:]://%511[^/]%511[^\r\n]",pr,h,p);

   if(r==2) {

     d(printf("netstream: adding default path '/'\n"))

     strcpy(p,"/");

     r++;

     }

   if(r==3) {

     a[0]=0;

     char *s=index(h,'@');

     if(s) {

       *s=0;

       strcpy(a,h);

       strcpy(h,s+1);

       }

     d(printf("netstream: parsed proto='%s' host='%s' path='%s' auth='%s'\n",pr,h,p,a))

     if(!strcasecmp(pr,"http")) {

       int pp=DEFAULT_PORT;

       s=rindex(h,':');

       if(s) { *s++=0; pp=atoi(s); }

       free(host); host=strdup(h);

       free(path); path=strdup(p);

       free(auth); auth=a[0] ? strdup(a) : 0;

       port=pp;

       return true;

       }

     else if(log) esyslog("Unsupported protocol %s in: %s",pr,line);

     }

   else if(log) esyslog("Bad URL line: %s",line);

   return false;    

 }

 bool cNetStream::ParseURLFile(const char *name, bool log)

 {

   bool res=false;

   FILE *f=fopen(name,"r");

   if(f) {

     char line[2048];

     if(fgets(line,sizeof(line),f)) {

       res=ParseURL(line,log);

       }

     else if(log) esyslog("Nothing to read from URL file %s. File empty?",name);

     fclose(f);

     }

   else if(log) esyslog("fopen() failed on URL file %s: %s",name,strerror(errno));

   return res;

 }

 bool cNetStream::SendRequest(void)

 {

   bool res=false;

   char buff[2048];

   char *h, *p;

   asprintf(&h,port!=DEFAULT_PORT ? "%s:%d":"%s",host,port);

   if(MP3Setup.UseProxy) asprintf(&p,"http://%s%s",h,path);

   else asprintf(&p,"%s",path);

   char a[1024];

   a[0]=0;

   if(auth) {

     cBase64Encoder b64((uchar *)auth,strlen(auth),76);

     int q=0;

     const char *l;

     while((l=b64.NextLine())) {

       q+=snprintf(&a[q],sizeof(a)-q,"%s%s\r\n",q==0?"Authorization: Basic ":" ",l);

       }

     }

   snprintf(buff,sizeof(buff),

            "GET %s HTTP/1.0\r\n"

            "User-Agent: %s/%s\r\n"

            "Host: %s\r\n"

            "Accept: audio/mpeg\r\n"   //XXX audio/x-mpegurl, */*

            "Icy-MetaData: 1\r\n"

            "%s\r\n",

            p,PLUGIN_NAME,PLUGIN_VERSION,h,a);

   free(p); free(h);  

   if(++cc==1) asyncStatus.Set(tr("Connecting to stream server ..."));

   if(net->Connect(MP3Setup.UseProxy ? MP3Setup.ProxyHost:host , MP3Setup.UseProxy ? MP3Setup.ProxyPort:port)) {

     d(printf("netstream: -> %s",buff))

     if(net->Puts(buff)>0) res=GetHTTPResponse();

     }

   if(cc--==1) asyncStatus.Set(0);

   return res;

 }

 bool cNetStream::ParseHeader(const char *buff, const char *name, char **value)

 {

   char *s=index(buff,':');

   if(s && !strncasecmp(buff,name,s-buff)) {

     s=skipspace(s+1);

     d(printf("netstream: found header '%s' contents '%s'\n",name,s))

     free(*value); *value=strdup(s);

     return true;

     }

   return false;

 }

 bool cNetStream::GetHTTPResponse(void)

 {

   bool res=false;

   char buff[1024], text[128], *newurl=0;

   int code=-1, hcount=0;

   while(net->Gets(buff,sizeof(buff))>0) {

     stripspace(buff);

 #ifdef DUMP_HEAD

     Dump(DUMP_HEAD,buff);

 #endif

     d(printf("netstream: <- %s\n",buff))

     hcount++;

     if(hcount==1) {   // parse status line

       if(sscanf(buff,"%*[^ ] %d %128s",&code,text)!=2) {

         esyslog("Bad HTTP response '%s' from %s:%d",buff,host,port);

         goto out;

         }

       }

     else {            // parse header lines

       if(buff[0]==0) { // headers finish if we receive a empty line

         switch(code) {

           case 200: // OK

              res=true;

              goto out;

           case 300: // MULTIPLE_CHOICES

           case 301: // MOVED_PERMANENTLY

           case 302: // MOVED_TEMPORARILY

              if(newurl) {

                if(ParseURL(newurl,true)) res=SendRequest();

                }

              else esyslog("No location header for redirection from %s:%d",host,port);

              goto out;

           default:

              esyslog("Unhandled HTTP response '%d %s' from %s:%d",code,text,host,port);

              goto out;

           }

         }

       ParseHeader(buff,"Location",&newurl);

       ParseHeader(buff,"icy-name",&icyName);

       ParseHeader(buff,"icy-url",&icyUrl);

       char *meta=0;

       if(ParseHeader(buff,"icy-metaint",&meta)) {

         metaInt=metaCnt=atol(meta);

         d(printf("netstream: meta interval set to %d\n",metaInt));

         }

       free(meta);

       }

     }

 out:

   free(newurl);

   return res;

 }

 bool cNetStream::Open(bool log)

 {

   if(net && net->Connected()) return true;

   if(!net) net=new cNet(0,0,0);

   net->Disconnect();

   if(ParseURLFile(Filename,log)) {

     buffpos=readpos=0; fill=0;

     buffer = new unsigned char[MP3FILE_BUFSIZE];

     if(buffer) {

       if(SendRequest()) {

         return true;

         }

       }

     else esyslog("Not enough memory for buffer");

     }

   Close();

   return false;

 }

 void cNetStream::Close(void)

 {

   delete buffer; buffer=0;

   delete net; net=0;

 }

 bool cNetStream::Seek(unsigned long long pos)

 {

   return false;

 }

 bool cNetStream::Stream(unsigned char * &data, unsigned long &len, const unsigned char *rest)

 {

   if(net && net->Connected()) {

     if(rest && fill) {       // copy remaining data to start of buffer

       fill-=(rest-buffer);   // remaing bytes

       memmove(buffer,rest,fill);

       }

     else fill=0;

     int r=MP3FILE_BUFSIZE-fill;

     if(metaInt && r>metaCnt) r=metaCnt;

     r=net->Read(buffer+fill,r);

     if(r>=0) {

       fill+=r; data=buffer; len=fill;

       metaCnt-=r;

       if(metaInt && metaCnt<=0) {

         ParseMetaData();

         metaCnt=metaInt;

         }

       return true;

       }

     }

   return false;

 }

 char *cNetStream::ParseMetaString(const char *buff, const char *name, char **value)

 {

   char *s=index(buff,'=');

   if(s && !strncasecmp(buff,name,s-buff)) {

     char *end=index(s+2,'\'');

     if(s[1]=='\'' && end) {

       *end=0;

       s=stripspace(skipspace(s+2));

       if(strlen(s)>0) {

         d(printf("netstream: found metadata '%s' contents '%s'\n",name,s))

         free(*value); *value=strdup(s);

         }

       //else d(printf("netstream: found empty metadata '%s'\n",name))

       return end+1;

       }

     else d(printf("netstream: bad metadata format\n"))

     }

   return 0;

 }

 bool cNetStream::ParseMetaData(void)

 {

   unsigned char byte;

   int r=net->Read(&byte,1);

   if(r<=0) return false;

   int metalen=byte*16;

   if(metalen>0) {

     char data[metalen+1];

     data[metalen]=0;

     int cnt=0;

     do {

       r=net->Read((unsigned char *)data+cnt,metalen-cnt);

       if(r<=0) return false;

       cnt+=r;

       } while(cnt<metalen);

 #ifdef DUMP_HEAD

     Dump(DUMP_HEAD,data);

 #endif

     char *p=data;

     while(*p && p-data<metalen) {

       char *n;

       if((n=ParseMetaString(p,"StreamTitle",&icyTitle)) ||

          (n=ParseMetaString(p,"StreamUrl",&icyUrl))) {

         p=n;

         icyChanged=true;

         }

       else  p++;

       }

     }

   return true;

 }

 bool cNetStream::IcyChanged(void)

 {

   bool c=icyChanged;

   icyChanged=false;

   return c;

 }