httpget.h

nsis是一个流传比较广的程序安装和解安装封装软件

/*
** JNetLib
** Copyright (C) 2000-2001 Nullsoft, Inc.
** Author: Justin Frankel
** File: httpget.h - JNL interface for doing HTTP GETs.
** License: see jnetlib.h
**
** Usage:
**   1. Create a JNL_HTTPGet object, optionally specifying a JNL_AsyncDNS
**      object to use (or NULL for none, or JNL_CONNECTION_AUTODNS for auto),
**      and the receive buffer size, and a string specifying proxy (or NULL 
**      for none). See note on proxy string below.
**   2. call addheader() to add whatever headers you want. It is recommended to
**      add at least the following two:
**        addheader("User-Agent:MyApp (Mozilla)");
*///      addheader("Accept:*/*");
/*         ( the comment weirdness is there so I Can do the star-slash :)
**   3. Call connect() with the URL you wish to GET (see URL string note below)
**   4. Call run() once in a while, checking to see if it returns -1 
**      (if it does return -1, call geterrorstr() to see what the error is).
**      (if it returns 1, no big deal, the connection has closed).
**   5. While you're at it, you can call bytes_available() to see if any data
**      from the http stream is available, or getheader() to see if any headers
**      are available, or getreply() to see the HTTP reply, or getallheaders() 
**      to get a double null terminated, null delimited list of headers returned.
**   6. If you want to read from the stream, call get_bytes (which returns how much
**      was actually read).
**   7. content_length() is a helper function that uses getheader() to check the
**      content-length header.
**   8. Delete ye' ol' object when done.
**
** Proxy String:
**   should be in the format of host:port, or user@host:port, or 
**   user:password@host:port. if port is not specified, 80 is assumed.
** URL String:
**   should be in the format of http://user:pass@host:port/requestwhatever
**   note that user, pass, port, and /requestwhatever are all optional :)
**   note that also, http:// is really not important. if you do poo://
**   or even leave out the http:// altogether, it will still work.
*/

#ifndef _HTTPGET_H_
#define _HTTPGET_H_

#include "connection.h"
#include "util.h"

class JNL_HTTPGet
{
  public:
    JNL_HTTPGet(JNL_AsyncDNS *dns=JNL_CONNECTION_AUTODNS, int recvbufsize=16384, char *proxy=NULL);
    ~JNL_HTTPGet();

    void addheader(char *header);

    void connect(char *url);

    int run(); // returns: 0 if all is OK. -1 if error (call geterrorstr()). 1 if connection closed.

    int   get_status(); // returns 0 if connecting, 1 if reading headers, 
                        // 2 if reading content, -1 if error.

    char *getallheaders(); // double null terminated, null delimited list
    char *getheader(char *headername);
    char *getreply() { return m_reply; }
    int   getreplycode(); // returns 0 if none yet, otherwise returns http reply code.

    char *geterrorstr() { return m_errstr;}

    int bytes_available();
    int get_bytes(char *buf, int len);
    int peek_bytes(char *buf, int len);

    int content_length() { char *p=getheader("content-length:"); if (p) return my_atoi(p); return 0; }

    JNL_Connection *get_con() { return m_con; }

  public:
    void reinit();
    void deinit();
    void seterrstr(char *str) { if (m_errstr) free(m_errstr); m_errstr=(char*)malloc(strlen(str)+1); strcpy(m_errstr,str); }

    void do_parse_url(char *url, char **host, int *port, char **req, char **lp);
    void do_encode_mimestr(char *in, char *out);

    JNL_AsyncDNS *m_dns;
    JNL_Connection *m_con;
    int m_recvbufsize;

    int m_http_state;

    int m_http_port;
    char *m_http_url;
    char *m_http_host;
    char *m_http_lpinfo;
    char *m_http_request;

    char *m_http_proxylpinfo;
    char *m_http_proxyhost;
    int   m_http_proxyport;

    char *m_sendheaders;
    char *m_recvheaders;
    int m_recvheaders_size;
    char *m_reply;

    char *m_errstr;
};

#endif // _HTTPGET_H_