libcurl 学习（1）[CURLoption]

CURLoption：

#define CURLOPTTYPE_LONG          0
#define CURLOPTTYPE_OBJECTPOINT   10000
#define CURLOPTTYPE_FUNCTIONPOINT 20000
#define CURLOPTTYPE_OFF_T         30000

#define CINIT(name,type,number) CURLOPT_ ## name = CURLOPTTYPE_ ## type + number

/*
* CINIT(WRITEFUNCTION, FUNCTIONPOINT, 11) -> CURLOPT_WRITEFUNCTION = CURLOPTTYPE_FUNCTIONPOINT + 11
* CINIT(URL,  OBJECTPOINT, 2) - > CURLOPT_URL = CURLOPTTYPE_OBJECTPOINT + 2
*/

typedef enum {
  /* This is the FILE * or void * the regular output should be written to. */
  CINIT(FILE, OBJECTPOINT, 1),

  /* The full URL to get/put */
  CINIT(URL,  OBJECTPOINT, 2),

  /* Port number to connect to, if other than default. */
  CINIT(PORT, LONG, 3),

  /* Name of proxy to use. */
  CINIT(PROXY, OBJECTPOINT, 4),

  /* "name:password" to use when fetching. */
  CINIT(USERPWD, OBJECTPOINT, 5),

  /* "name:password" to use with proxy. */
  CINIT(PROXYUSERPWD, OBJECTPOINT, 6),

  /* Range to get, specified as an ASCII string. */
  CINIT(RANGE, OBJECTPOINT, 7),

  /* not used */

  /* Specified file stream to upload from (use as input): */
  CINIT(INFILE, OBJECTPOINT, 9),

  /* Buffer to receive error messages in, must be at least CURL_ERROR_SIZE
   * bytes big. If this is not used, error messages go to stderr instead: */
  CINIT(ERRORBUFFER, OBJECTPOINT, 10),

  /* Function that will be called to store the output (instead of fwrite). The
   * parameters will use fwrite() syntax, make sure to follow them. */
  CINIT(WRITEFUNCTION, FUNCTIONPOINT, 11),

  /* Function that will be called to read the input (instead of fread). The
   * parameters will use fread() syntax, make sure to follow them. */
  CINIT(READFUNCTION, FUNCTIONPOINT, 12),

  /* Time-out the read operation after this amount of seconds */
  CINIT(TIMEOUT, LONG, 13),

  /* If the CURLOPT_INFILE is used, this can be used to inform libcurl about
   * how large the file being sent really is. That allows better error
   * checking and better verifies that the upload was succcessful. -1 means
   * unknown size.
   *
   * For large file support, there is also a _LARGE version of the key
   * which takes an off_t type, allowing platforms with larger off_t
   * sizes to handle larger files.  See below for INFILESIZE_LARGE.
   */
  CINIT(INFILESIZE, LONG, 14),

  /* POST input fields. */
  CINIT(POSTFIELDS, OBJECTPOINT, 15),

  /* Set the referer page (needed by some CGIs) */
  CINIT(REFERER, OBJECTPOINT, 16),

  /* Set the FTP PORT string (interface name, named or numerical IP address)
     Use i.e '-' to use default address. */
  CINIT(FTPPORT, OBJECTPOINT, 17),

  /* Set the User-Agent string (examined by some CGIs) */
  CINIT(USERAGENT, OBJECTPOINT, 18),

  /* If the download receives less than "low speed limit" bytes/second
   * during "low speed time" seconds, the operations is aborted.
   * You could i.e if you have a pretty high speed connection, abort if
   * it is less than 2000 bytes/sec during 20 seconds.
   */

  /* Set the "low speed limit" */
  CINIT(LOW_SPEED_LIMIT, LONG , 19),

  /* Set the "low speed time" */
  CINIT(LOW_SPEED_TIME, LONG, 20),

  /* Set the continuation offset.
   *
   * Note there is also a _LARGE version of this key which uses
   * off_t types, allowing for large file offsets on platforms which
   * use larger-than-32-bit off_t's.  Look below for RESUME_FROM_LARGE.
   */
  CINIT(RESUME_FROM, LONG, 21),

  /* Set cookie in request: */
  CINIT(COOKIE, OBJECTPOINT, 22),

  /* This points to a linked list of headers, struct curl_slist kind */
  CINIT(HTTPHEADER, OBJECTPOINT, 23),

  /* This points to a linked list of post entries, struct HttpPost */
  CINIT(HTTPPOST, OBJECTPOINT, 24),

  /* name of the file keeping your private SSL-certificate */
  CINIT(SSLCERT, OBJECTPOINT, 25),

  /* password for the SSL-private key, keep this for compatibility */
  CINIT(SSLCERTPASSWD, OBJECTPOINT, 26),
  /* password for the SSL private key */
  CINIT(SSLKEYPASSWD, OBJECTPOINT, 26),

  /* send TYPE parameter? */
  CINIT(CRLF, LONG, 27),

  /* send linked-list of QUOTE commands */
  CINIT(QUOTE, OBJECTPOINT, 28),

  /* send FILE * or void * to store headers to, if you use a callback it
     is simply passed to the callback unmodified */
  CINIT(WRITEHEADER, OBJECTPOINT, 29),

  /* point to a file to read the initial cookies from, also enables
     "cookie awareness" */
  CINIT(COOKIEFILE, OBJECTPOINT, 31),

  /* What version to specifly try to use.
     See CURL_SSLVERSION defines below. */
  CINIT(SSLVERSION, LONG, 32),

  /* What kind of HTTP time condition to use, see defines */
  CINIT(TIMECONDITION, LONG, 33),

  /* Time to use with the above condition. Specified in number of seconds
     since 1 Jan 1970 */
  CINIT(TIMEVALUE, LONG, 34),

  /* 35 = OBSOLETE */

  /* Custom request, for customizing the get command like
     HTTP: DELETE, TRACE and others
     FTP: to use a different list command
     */
  CINIT(CUSTOMREQUEST, OBJECTPOINT, 36),

  /* HTTP request, for odd commands like DELETE, TRACE and others */
  CINIT(STDERR, OBJECTPOINT, 37),

  /* 38 is not used */

  /* send linked-list of post-transfer QUOTE commands */
  CINIT(POSTQUOTE, OBJECTPOINT, 39),

  /* Pass a pointer to string of the output using full variable-replacement
     as described elsewhere. */
  CINIT(WRITEINFO, OBJECTPOINT, 40),

  CINIT(VERBOSE, LONG, 41),      /* talk a lot */
  CINIT(HEADER, LONG, 42),       /* throw the header out too */
  CINIT(NOPROGRESS, LONG, 43),   /* shut off the progress meter */
  CINIT(NOBODY, LONG, 44),       /* use HEAD to get http document */
  CINIT(FAILONERROR, LONG, 45),  /* no output on http error codes >= 300 */
  CINIT(UPLOAD, LONG, 46),       /* this is an upload */
  CINIT(POST, LONG, 47),         /* HTTP POST method */
  CINIT(FTPLISTONLY, LONG, 48),  /* Use NLST when listing ftp dir */

  CINIT(FTPAPPEND, LONG, 50),    /* Append instead of overwrite on upload! */

  /* Specify whether to read the user+password from the .netrc or the URL.
   * This must be one of the CURL_NETRC_* enums below. */
  CINIT(NETRC, LONG, 51),

  CINIT(FOLLOWLOCATION, LONG, 52),  /* use Location: Luke! */

  CINIT(TRANSFERTEXT, LONG, 53), /* transfer data in text/ASCII format */
  CINIT(PUT, LONG, 54),          /* HTTP PUT */

  /* 55 = OBSOLETE */

  /* Function that will be called instead of the internal progress display
   * function. This function should be defined as the curl_progress_callback
   * prototype defines. */
  CINIT(PROGRESSFUNCTION, FUNCTIONPOINT, 56),

  /* Data passed to the progress callback */
  CINIT(PROGRESSDATA, OBJECTPOINT, 57),

  /* We want the referer field set automatically when following locations */
  CINIT(AUTOREFERER, LONG, 58),

  /* Port of the proxy, can be set in the proxy string as well with:
     "[host]:[port]" */
  CINIT(PROXYPORT, LONG, 59),

  /* size of the POST input data, if strlen() is not good to use */
  CINIT(POSTFIELDSIZE, LONG, 60),

  /* tunnel non-http operations through a HTTP proxy */
  CINIT(HTTPPROXYTUNNEL, LONG, 61),

  /* Set the interface string to use as outgoing network interface */
  CINIT(INTERFACE, OBJECTPOINT, 62),

  /* Set the krb4 security level, this also enables krb4 awareness.  This is a
   * string, 'clear', 'safe', 'confidential' or 'private'.  If the string is
   * set but doesn't match one of these, 'private' will be used.  */
  CINIT(KRB4LEVEL, OBJECTPOINT, 63),

  /* Set if we should verify the peer in ssl handshake, set 1 to verify. */
  CINIT(SSL_VERIFYPEER, LONG, 64),

  /* The CApath or CAfile used to validate the peer certificate
     this option is used only if SSL_VERIFYPEER is true */
  CINIT(CAINFO, OBJECTPOINT, 65),

  /* 66 = OBSOLETE */
  /* 67 = OBSOLETE */

  /* Maximum number of http redirects to follow */
  CINIT(MAXREDIRS, LONG, 68),

  /* Pass a long set to 1 to get the date of the requested document (if
     possible)! Pass a zero to shut it off. */
  CINIT(FILETIME, LONG, 69),

  /* This points to a linked list of telnet options */
  CINIT(TELNETOPTIONS, OBJECTPOINT, 70),

  /* Max amount of cached alive connections */
  CINIT(MAXCONNECTS, LONG, 71),

  /* What policy to use when closing connections when the cache is filled
     up */
  CINIT(CLOSEPOLICY, LONG, 72),

  /* 73 = OBSOLETE */

  /* Set to explicitly use a new connection for the upcoming transfer.
     Do not use this unless you're absolutely sure of this, as it makes the
     operation slower and is less friendly for the network. */
  CINIT(FRESH_CONNECT, LONG, 74),

  /* Set to explicitly forbid the upcoming transfer's connection to be re-used
     when done. Do not use this unless you're absolutely sure of this, as it
     makes the operation slower and is less friendly for the network. */
  CINIT(FORBID_REUSE, LONG, 75),

  /* Set to a file name that contains random data for libcurl to use to
     seed the random engine when doing SSL connects. */
  CINIT(RANDOM_FILE, OBJECTPOINT, 76),

  /* Set to the Entropy Gathering Daemon socket pathname */
  CINIT(EGDSOCKET, OBJECTPOINT, 77),

  /* Time-out connect operations after this amount of seconds, if connects
     are OK within this time, then fine... This only aborts the connect
     phase. [Only works on unix-style/SIGALRM operating systems] */
  CINIT(CONNECTTIMEOUT, LONG, 78),

  /* Function that will be called to store headers (instead of fwrite). The
   * parameters will use fwrite() syntax, make sure to follow them. */
  CINIT(HEADERFUNCTION, FUNCTIONPOINT, 79),

  /* Set this to force the HTTP request to get back to GET. Only really usable
     if POST, PUT or a custom request have been used first.
   */
  CINIT(HTTPGET, LONG, 80),

  /* Set if we should verify the Common name from the peer certificate in ssl
   * handshake, set 1 to check existence, 2 to ensure that it matches the
   * provided hostname. */
  CINIT(SSL_VERIFYHOST, LONG, 81),

  /* Specify which file name to write all known cookies in after completed
     operation. Set file name to "-" (dash) to make it go to stdout. */
  CINIT(COOKIEJAR, OBJECTPOINT, 82),

  /* Specify which SSL ciphers to use */
  CINIT(SSL_CIPHER_LIST, OBJECTPOINT, 83),

  /* Specify which HTTP version to use! This must be set to one of the
     CURL_HTTP_VERSION* enums set below. */
  CINIT(HTTP_VERSION, LONG, 84),

  /* Specificly switch on or off the FTP engine's use of the EPSV command. By
     default, that one will always be attempted before the more traditional
     PASV command. */
  CINIT(FTP_USE_EPSV, LONG, 85),

  /* type of the file keeping your SSL-certificate ("DER", "PEM", "ENG") */
  CINIT(SSLCERTTYPE, OBJECTPOINT, 86),

  /* name of the file keeping your private SSL-key */
  CINIT(SSLKEY, OBJECTPOINT, 87),

  /* type of the file keeping your private SSL-key ("DER", "PEM", "ENG") */
  CINIT(SSLKEYTYPE, OBJECTPOINT, 88),

  /* crypto engine for the SSL-sub system */
  CINIT(SSLENGINE, OBJECTPOINT, 89),

  /* set the crypto engine for the SSL-sub system as default
     the param has no meaning...
   */
  CINIT(SSLENGINE_DEFAULT, LONG, 90),

  /* Non-zero value means to use the global dns cache */
  CINIT(DNS_USE_GLOBAL_CACHE, LONG, 91), /* To becomeO BSOLETE soon */

  /* DNS cache timeout */
  CINIT(DNS_CACHE_TIMEOUT, LONG, 92),

  /* send linked-list of pre-transfer QUOTE commands (Wesley Laxton)*/
  CINIT(PREQUOTE, OBJECTPOINT, 93),

  /* set the debug function */
  CINIT(DEBUGFUNCTION, FUNCTIONPOINT, 94),

  /* set the data for the debug function */
  CINIT(DEBUGDATA, OBJECTPOINT, 95),

  /* mark this as start of a cookie session */
  CINIT(COOKIESESSION, LONG, 96),

  /* The CApath directory used to validate the peer certificate
     this option is used only if SSL_VERIFYPEER is true */
  CINIT(CAPATH, OBJECTPOINT, 97),

  /* Instruct libcurl to use a smaller receive buffer */
  CINIT(BUFFERSIZE, LONG, 98),

  /* Instruct libcurl to not use any signal/alarm handlers, even when using
     timeouts. This option is useful for multi-threaded applications.
     See libcurl-the-guide for more background information. */
  CINIT(NOSIGNAL, LONG, 99),

  /* Provide a CURLShare for mutexing non-ts data */
  CINIT(SHARE, OBJECTPOINT, 100),

  /* indicates type of proxy. accepted values are CURLPROXY_HTTP (default),
     CURLPROXY_SOCKS4 and CURLPROXY_SOCKS5. */
  CINIT(PROXYTYPE, LONG, 101),

  /* Set the Accept-Encoding string. Use this to tell a server you would like
     the response to be compressed. */
  CINIT(ENCODING, OBJECTPOINT, 102),

  /* Set pointer to private data */
  CINIT(PRIVATE, OBJECTPOINT, 103),

  /* Set aliases for HTTP 200 in the HTTP Response header */
  CINIT(HTTP200ALIASES, OBJECTPOINT, 104),

  /* Continue to send authentication (user+password) when following locations,
     even when hostname changed. This can potentionally send off the name
     and password to whatever host the server decides. */
  CINIT(UNRESTRICTED_AUTH, LONG, 105),

  /* Specificly switch on or off the FTP engine's use of the EPRT command ( it
     also disables the LPRT attempt). By default, those ones will always be
     attempted before the good old traditional PORT command. */
  CINIT(FTP_USE_EPRT, LONG, 106),

  /* Set this to a bitmask value to enable the particular authentications
     methods you like. Use this in combination with CURLOPT_USERPWD.
     Note that setting multiple bits may cause extra network round-trips. */
  CINIT(HTTPAUTH, LONG, 107),

  /* Set the ssl context callback function, currently only for OpenSSL ssl_ctx
     in second argument. The function must be matching the
     curl_ssl_ctx_callback proto. */
  CINIT(SSL_CTX_FUNCTION, FUNCTIONPOINT, 108),

  /* Set the userdata for the ssl context callback function's third
     argument */
  CINIT(SSL_CTX_DATA, OBJECTPOINT, 109),

  /* FTP Option that causes missing dirs to be created on the remote server */
  CINIT(FTP_CREATE_MISSING_DIRS, LONG, 110),

  /* Set this to a bitmask value to enable the particular authentications
     methods you like. Use this in combination with CURLOPT_PROXYUSERPWD.
     Note that setting multiple bits may cause extra network round-trips. */
  CINIT(PROXYAUTH, LONG, 111),

  /* FTP option that changes the timeout, in seconds, associated with
     getting a response.  This is different from transfer timeout time and
     essentially places a demand on the FTP server to acknowledge commands
     in a timely manner. */
  CINIT(FTP_RESPONSE_TIMEOUT, LONG , 112),

  /* Set this option to one of the CURL_IPRESOLVE_* defines (see below) to
     tell libcurl to resolve names to those IP versions only. This only has
     affect on systems with support for more than one, i.e IPv4 _and_ IPv6. */
  CINIT(IPRESOLVE, LONG, 113),

  /* Set this option to limit the size of a file that will be downloaded from
     an HTTP or FTP server.

     Note there is also _LARGE version which adds large file support for
     platforms which have larger off_t sizes.  See MAXFILESIZE_LARGE below. */
  CINIT(MAXFILESIZE, LONG, 114),

  /* See the comment for INFILESIZE above, but in short, specifies
   * the size of the file being uploaded.  -1 means unknown.
   */
  CINIT(INFILESIZE_LARGE, OFF_T, 115),

  /* Sets the continuation offset.  There is also a LONG version of this;
   * look above for RESUME_FROM.
   */
  CINIT(RESUME_FROM_LARGE, OFF_T, 116),

  /* Sets the maximum size of data that will be downloaded from
   * an HTTP or FTP server.  See MAXFILESIZE above for the LONG version.
   */
  CINIT(MAXFILESIZE_LARGE, OFF_T, 117),

  /* Set this option to the file name of your .netrc file you want libcurl
     to parse (using the CURLOPT_NETRC option). If not set, libcurl will do
     a poor attempt to find the user's home directory and check for a .netrc
     file in there. */
  CINIT(NETRC_FILE, OBJECTPOINT, 118),

  /* Enable SSL/TLS for FTP, pick one of:
     CURLFTPSSL_TRY     - try using SSL, proceed anyway otherwise
     CURLFTPSSL_CONTROL - SSL for the control connection or fail
     CURLFTPSSL_ALL     - SSL for all communication or fail
  */
  CINIT(FTP_SSL, LONG, 119),

  /* The _LARGE version of the standard POSTFIELDSIZE option */
  CINIT(POSTFIELDSIZE_LARGE, OFF_T, 120),

  /* Enable/disable the TCP Nagle algorithm */
  CINIT(TCP_NODELAY, LONG, 121),

  /* 122 OBSOLETE, used in 7.12.3. Gone in 7.13.0 */

  /* When doing 3rd party transfer, set the source user and password with
     this */
  CINIT(SOURCE_USERPWD, OBJECTPOINT, 123),

  /* 124 OBSOLETE, used in 7.12.3. Gone in 7.13.0 */
  /* 125 OBSOLETE, used in 7.12.3. Gone in 7.13.0 */
  /* 126 OBSOLETE, used in 7.12.3. Gone in 7.13.0 */

  /* When doing 3rd party transfer, set the source pre-quote linked list
     of commands with this */
  CINIT(SOURCE_PREQUOTE, OBJECTPOINT, 127),

  /* When doing 3rd party transfer, set the source post-quote linked list
     of commands with this */
  CINIT(SOURCE_POSTQUOTE, OBJECTPOINT, 128),

  /* When FTP over SSL/TLS is selected (with CURLOPT_FTP_SSL), this option
     can be used to change libcurl's default action which is to first try
     "AUTH SSL" and then "AUTH TLS" in this order, and proceed when a OK
     response has been received.

     Available parameters are:
     CURLFTPAUTH_DEFAULT - let libcurl decide
     CURLFTPAUTH_SSL     - try "AUTH SSL" first, then TLS
     CURLFTPAUTH_TLS     - try "AUTH TLS" first, then SSL
  */
  CINIT(FTPSSLAUTH, LONG, 129),

  CINIT(IOCTLFUNCTION, FUNCTIONPOINT, 130),
  CINIT(IOCTLDATA, OBJECTPOINT, 131),

  /* To make a 3rd party transfer, set the source URL with this */
  CINIT(SOURCE_URL, OBJECTPOINT, 132),

  /* When doing 3rd party transfer, set the source quote linked list of
     commands with this */
  CINIT(SOURCE_QUOTE, OBJECTPOINT, 133),

  /* zero terminated string for pass on to the FTP server when asked for
     "account" info */
  CINIT(FTP_ACCOUNT, OBJECTPOINT, 134),

  /* feed cookies into cookie engine */
  CINIT(COOKIELIST, OBJECTPOINT, 135),

  /* ignore Content-Length */
  CINIT(IGNORE_CONTENT_LENGTH, LONG, 136),

  /* Set to non-zero to skip the IP address received in a 227 PASV FTP server
     response. Typically used for FTP-SSL purposes but is not restricted to
     that. libcurl will then instead use the same IP address it used for the
     control connection. */
  CINIT(FTP_SKIP_PASV_IP, LONG, 137),

  /* Select "file method" to use when doing FTP */
  CINIT(FTP_FILEMETHOD, LONG, 138),

  CURLOPT_LASTENTRY /* the last unused */
} CURLoption;