int TransmitFileToSocket(
int clientsock,
char * verified_filename,
unsigned long start_at_byte, // Optionally start with an offset ( resume download functionality )
unsigned long end_at_byte // Optionally end at an offset ( resume download functionality )
)
{
FILE * pFile = fopen (verified_filename, "rb" );
if (pFile==0) { fprintf(stderr,"Could not open file %s , files open %u \n",verified_filename,files_open); return 0;}
++files_open;
// obtain file size:
if ( fseek (pFile , 0 , SEEK_END)!=0 )
{
warning("Could not find file size..!\nUnable to serve client\n");
fclose(pFile);
--files_open;
return 0;
}
unsigned long lSize = ftell (pFile);
if ( (end_at_byte!=0) && (lSize<end_at_byte) )
{ fprintf(stderr,"TODO: Handle incorrect range request ( from %u to %u file 0 to %u ..!\n",(unsigned int) start_at_byte,(unsigned int) end_at_byte,(unsigned int) lSize); }
fprintf(stderr,"Sending file %s , size %0.2f Kbytes , Open files %u \n",verified_filename,(double) lSize/1024,files_open);
char reply_header[MAX_HTTP_REQUEST_SHORT_HEADER_REPLY]={0};
//THIS ALSO EXISTS IN THE Cached resource response CODE around line 395
if ( (start_at_byte!=0) || (end_at_byte!=0) )
{
//error(" TransmitFileToSocket Content-Range response");
//Content-Range: bytes 1000-3979/3980
int endAtBytePrinted = end_at_byte;
if (endAtBytePrinted == 0 ) { endAtBytePrinted = lSize; }
snprintf(reply_header,MAX_HTTP_REQUEST_SHORT_HEADER_REPLY,"Content-Range: bytes %lu-%u/%lu\nContent-length: %lu\n\n",start_at_byte,endAtBytePrinted,lSize,lSize-start_at_byte);
} else
{
//error("TransmitFileToSocket Plain Content-Length ");
//This is the last header part , so we are appending an extra \n to mark the end of the header
snprintf(reply_header,MAX_HTTP_REQUEST_SHORT_HEADER_REPLY,"Content-length: %u\n\n",(unsigned int) lSize);
}
if (!SendPart(clientsock,reply_header,strlen(reply_header))) { fprintf(stderr,"Failed sending Content-length @ SendFile ..!\n"); }
rewind (pFile);
if (start_at_byte!=0) { fseek (pFile , start_at_byte , SEEK_SET); }
if (end_at_byte==0) { end_at_byte=lSize-start_at_byte; }
int res = TransmitFileToSocketInternal(pFile,clientsock,end_at_byte);
--files_open;
fclose (pFile);
return res;
}
int TransmitFileToSocket(
struct AmmServer_Instance * instance,
int clientsock,
const char * verified_filename,
unsigned long start_at_byte, // Optionally start with an offset ( resume download functionality )
unsigned long end_at_byte // Optionally end at an offset ( resume download functionality )
)
{
int res = 0;
FILE * pFile = fopen (verified_filename, "rb" );
//If we can't open the file we fail to transmit the file
if (pFile==0)
{
fprintf(stderr,"Could not open file %s , files open %lu \n",verified_filename,instance->statistics.filesCurrentlyOpen);
return 0;
} else
{
//Count the open file
++instance->statistics.filesCurrentlyOpen;
//Try to obtain file size if not fail to transmit the fail
if ( fseek (pFile , 0 , SEEK_END)!=0 )
{
warning("Could not find file size..!\nUnable to serve client\n");
fclose(pFile);
if (instance->statistics.filesCurrentlyOpen>0) { --instance->statistics.filesCurrentlyOpen; } //Count the closed file
return 0;
}
unsigned long lSize = ftell (pFile);
//-------------------------------------------------------
if ( (end_at_byte!=0) && (lSize<end_at_byte) )
{
fprintf(stderr,"Incorrect range request , the file changed? ( from %u to %u file 0 to %u ..! ) ,forcing known size\n",(unsigned int) start_at_byte,(unsigned int) end_at_byte,(unsigned int) lSize);
end_at_byte=lSize;
}
fprintf(stderr,"Sending => Size %0.2f KB / Open files %lu / Filename %s \n",(double) lSize/1024,instance->statistics.filesCurrentlyOpen,verified_filename);
if (
TransmitFileHeaderToSocket(
instance,
clientsock,
start_at_byte, // Optionally start with an offset ( resume download functionality )
end_at_byte, // Optionally end at an offset ( resume download functionality )
lSize
)
)
{
rewind (pFile);
if (start_at_byte!=0) { fseek (pFile , start_at_byte , SEEK_SET); }
if (end_at_byte==0) { end_at_byte=lSize-start_at_byte; }
res = TransmitFileToSocketInternal(instance,pFile,clientsock,end_at_byte);
}
fclose (pFile);
if (instance->statistics.filesCurrentlyOpen>0) { --instance->statistics.filesCurrentlyOpen; } //Count the closed file
}
return res;
}
