I was thinking of writing a resume download program using win32 to know how it works since i know how socket is working. While i was reading about different headers of HTTP i came to know about Range request with which you can request a part of a file by specifying the start and end position.<\/p>\n
\r\n\t$out =\"GET \/a.txt HTTP\/1.1\\r\\n\";\r\n\t$out.=\"Host: localhost\\r\\n\";\t\r\n\t$out.=\"Range: bytes=3-5\\r\\n\";\r\n<\/pre>\nFirstly, we should determine the total size of a file using the HEAD request.<\/p>\n
\r\n\t$out =\"HEAD \/a.txt HTTP\/1.1\\r\\n\";\r\n\t$out.=\"Host: localhost\\r\\n\\r\\n\";\r\n<\/pre>\nYou can use your own parser to fetch the size of the file and have it in the memory.<\/p>\n
Here is the code to fetch a part of a file using php<\/p>\n
\r\n\t$f = fsockopen(\"localhost\",80);\r\n\tif(!$f)die(\"cannnot connect\");\t\r\n\t\r\n\t$out =\"GET \/this\/one.txt HTTP\/1.1\\r\\n\";\r\n\t$out.=\"Host: localhost\\r\\n\";\t\r\n\t$out.=\"Range: bytes=3-5\\r\\n\";\r\n\t$out.=\"Keev-alive: timeout=15, max=100\\r\\n\";\t\t\r\n\t$out.=\"connection: keep-alive\\r\\n\\r\\n\";\r\n\r\n\tfwrite($f,$out);\r\n\r\n\t$str ='';\r\n\twhile(!feof($f))\r\n\t\t$str.=fgets($f,128);\r\n\t\t\r\n\techo $str;\r\n<\/pre>\nnow you can see the part of the text in the file. change the byte ranges in the Range header and try more to see what happens. You can use a parser to fetch the content. You can find a http parser in php.net site.<\/p>\n
I have given the very least of information. I will explore on this more and this post will get updated as i update myself. <\/p>\n
If there is any objection then yes… proceed… that could help me and all who read this post… anyway… gozar…<\/p>\n