/*
 * nanohttp.c: minimalist HTTP GET implementation to fetch external subsets.
 *             focuses on size, streamability, reentrancy and portability
 *
 * This is clearly not a general purpose HTTP implementation
 * If you look for one, check:
 *         http://www.w3.org/Library/
 *
 * See Copyright for the status of this software.
 *
 * daniel@veillard.com
 */
 
#define NEED_SOCKETS
#define IN_LIBXML
#include "libxml.h"

#ifdef LIBXML_HTTP_ENABLED
#include <string.h>

#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_RESOLV_H
#ifdef HAVE_ARPA_NAMESER_H
#include <arpa/nameser.h>
#endif
#include <resolv.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h> 
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#ifdef SUPPORT_IP6
#include <resolv.h>
#endif
#include "vtk_libxml2_zlib.h"


#ifdef VMS
#include <stropts>
#define XML_SOCKLEN_T unsigned int
#define SOCKET int
#endif


#ifdef __MINGW32__
#define _WINSOCKAPI_
#include <wsockcompat.h>
#include <winsock2.h>
#undef XML_SOCKLEN_T
#define XML_SOCKLEN_T unsigned int
#endif


#include <libxml/globals.h>
#include <libxml/xmlerror.h>
#include <libxml/xmlmemory.h>
#include <libxml/parser.h> /* for xmlStr(n)casecmp() */
#include <libxml/nanohttp.h>
#include <libxml/globals.h>
#include <libxml/uri.h>

/**
 * A couple portability macros
 */
#ifndef _WINSOCKAPI_
#ifndef __BEOS__
#define closesocket(s) close(s)
#endif
#define SOCKET int
#endif

#ifdef __BEOS__
#ifndef PF_INET
#define PF_INET AF_INET
#endif
#endif

#ifndef XML_SOCKLEN_T
#define XML_SOCKLEN_T unsigned int
#endif
#ifndef SOCKET
#define SOCKET int
#endif

#ifdef STANDALONE
#define DEBUG_HTTP
#define xmlStrncasecmp(a, b, n) strncasecmp((char *)a, (char *)b, n)
#define xmlStrcasecmpi(a, b) strcasecmp((char *)a, (char *)b)
#endif

#define XML_NANO_HTTP_MAX_REDIR 10

#define XML_NANO_HTTP_CHUNK     4096

#define XML_NANO_HTTP_CLOSED    0
#define XML_NANO_HTTP_WRITE     1
#define XML_NANO_HTTP_READ      2
#define XML_NANO_HTTP_NONE      4

typedef struct xmlNanoHTTPCtxt {
    char *protocol;     /* the protocol name */
    char *hostname;     /* the host name */
    int port;           /* the port */
    char *path;         /* the path within the URL */
    char *query;        /* the query string */
    SOCKET fd;          /* the file descriptor for the socket */
    int state;          /* WRITE / READ / CLOSED */
    char *out;          /* buffer sent (zero terminated) */
    char *outptr;       /* index within the buffer sent */
    char *in;           /* the receiving buffer */
    char *content;      /* the start of the content */
    char *inptr;        /* the next byte to read from network */
    char *inrptr;       /* the next byte to give back to the client */
    int inlen;          /* len of the input buffer */
    int last;           /* return code for last operation */
    int returnValue;    /* the protocol return value */
    int ContentLength;  /* specified content length from HTTP header */
    char *contentType;  /* the MIME type for the input */
    char *location;     /* the new URL in case of redirect */
    char *authHeader;   /* contents of {WWW,Proxy}-Authenticate header */
    char *encoding;     /* encoding extracted from the contentType */
    char *mimeType;     /* Mime-Type extracted from the contentType */
#ifdef HAVE_ZLIB_H
    z_stream *strm;     /* Zlib stream object */
    int usesGzip;       /* "Content-Encoding: gzip" was detected */
#endif
} xmlNanoHTTPCtxt, *xmlNanoHTTPCtxtPtr;

static int initialized = 0;
static char *proxy = NULL;       /* the proxy name if any */
static int proxyPort;   /* the proxy port if any */
static unsigned int timeout = 60;/* the select() timeout in seconds */

static int xmlNanoHTTPFetchContent( void * ctx, char ** ptr, int * len );

/**
 * xmlHTTPErrMemory:
 * @extra:  extra informations
 *
 * Handle an out of memory condition
 */
static void
xmlHTTPErrMemory(const char *extra)
{
    __xmlSimpleError(XML_FROM_HTTP, XML_ERR_NO_MEMORY, NULL, NULL, extra);
}

/**
 * A portability function
 */
static int socket_errno(void) {
#ifdef _WINSOCKAPI_
    return(WSAGetLastError());
#else
    return(errno);
#endif
}

#ifdef SUPPORT_IP6
static
int have_ipv6(void) {
    int s;

    s = socket (AF_INET6, SOCK_STREAM, 0);
    if (s != -1) {
        close (s);
        return (1);
    }
    return (0);
}
#endif

/**
 * xmlNanoHTTPInit:
 *
 * Initialize the HTTP protocol layer.
 * Currently it just checks for proxy informations
 */

void
xmlNanoHTTPInit(void) {
    const char *env;
#ifdef _WINSOCKAPI_
    WSADATA wsaData;    
#endif

    if (initialized)
        return;

#ifdef _WINSOCKAPI_
    if (WSAStartup(MAKEWORD(1, 1), &wsaData) != 0)
        return;
#endif

    if (proxy == NULL) {
        proxyPort = 80;
        env = getenv("no_proxy");
        if (env && ((env[0] == '*') && (env[1] == 0)))
            goto done;
        env = getenv("http_proxy");
        if (env != NULL) {
            xmlNanoHTTPScanProxy(env);
            goto done;
        }
        env = getenv("HTTP_PROXY");
        if (env != NULL) {
            xmlNanoHTTPScanProxy(env);
            goto done;
        }
    }
done:
    initialized = 1;
}

/**
 * xmlNanoHTTPCleanup:
 *
 * Cleanup the HTTP protocol layer.
 */

void
xmlNanoHTTPCleanup(void) {
    if (proxy != NULL) {
        xmlFree(proxy);
        proxy = NULL;
    }
#ifdef _WINSOCKAPI_
    if (initialized)
        WSACleanup();
#endif
    initialized = 0;
    return;
}

/**
 * xmlNanoHTTPScanURL:
 * @ctxt:  an HTTP context
 * @URL:  The URL used to initialize the context
 *
 * (Re)Initialize an HTTP context by parsing the URL and finding
 * the protocol host port and path it indicates.
 */

static void
xmlNanoHTTPScanURL(xmlNanoHTTPCtxtPtr ctxt, const char *URL) {
    xmlURIPtr uri;
    /*
     * Clear any existing data from the context
     */
    if (ctxt->protocol != NULL) { 
        xmlFree(ctxt->protocol);
        ctxt->protocol = NULL;
    }
    if (ctxt->hostname != NULL) { 
        xmlFree(ctxt->hostname);
        ctxt->hostname = NULL;
    }
    if (ctxt->path != NULL) { 
        xmlFree(ctxt->path);
        ctxt->path = NULL;
    }
    if (ctxt->query != NULL) { 
        xmlFree(ctxt->query);
        ctxt->query = NULL;
    }
    if (URL == NULL) return;

    uri = xmlParseURIRaw(URL, 1);
    if (uri == NULL)
        return;

    if ((uri->scheme == NULL) || (uri->server == NULL)) {
        xmlFreeURI(uri);
        return;
    }
    
    ctxt->protocol = xmlMemStrdup(uri->scheme);
    ctxt->hostname = xmlMemStrdup(uri->server);
    if (uri->path != NULL)
        ctxt->path = xmlMemStrdup(uri->path);
    else
        ctxt->path = xmlMemStrdup("/");
    if (uri->query != NULL)
        ctxt->query = xmlMemStrdup(uri->query);
    if (uri->port != 0)
        ctxt->port = uri->port;

    xmlFreeURI(uri);
}

/**
 * xmlNanoHTTPScanProxy:
 * @URL:  The proxy URL used to initialize the proxy context
 *
 * (Re)Initialize the HTTP Proxy context by parsing the URL and finding
 * the protocol host port it indicates.
 * Should be like http://myproxy/ or http://myproxy:3128/
 * A NULL URL cleans up proxy informations.
 */

void
xmlNanoHTTPScanProxy(const char *URL) {
    xmlURIPtr uri;

    if (proxy != NULL) { 
        xmlFree(proxy);
        proxy = NULL;
    }
    proxyPort = 0;

#ifdef DEBUG_HTTP
    if (URL == NULL)
        xmlGenericError(xmlGenericErrorContext,
                "Removing HTTP proxy info\n");
    else
        xmlGenericError(xmlGenericErrorContext,
                "Using HTTP proxy %s\n", URL);
#endif
    if (URL == NULL) return;

    uri = xmlParseURIRaw(URL, 1);
    if ((uri == NULL) || (uri->scheme == NULL) ||
        (strcmp(uri->scheme, "http")) || (uri->server == NULL)) {
        __xmlIOErr(XML_FROM_HTTP, XML_HTTP_URL_SYNTAX, "Syntax Error\n");
        if (uri != NULL)
            xmlFreeURI(uri);
        return;
    }
    
    proxy = xmlMemStrdup(uri->server);
    if (uri->port != 0)
        proxyPort = uri->port;

    xmlFreeURI(uri);
}

/**
 * xmlNanoHTTPNewCtxt:
 * @URL:  The URL used to initialize the context
 *
 * Allocate and initialize a new HTTP context.
 *
 * Returns an HTTP context or NULL in case of error.
 */

static xmlNanoHTTPCtxtPtr
xmlNanoHTTPNewCtxt(const char *URL) {
    xmlNanoHTTPCtxtPtr ret;

    ret = (xmlNanoHTTPCtxtPtr) xmlMalloc(sizeof(xmlNanoHTTPCtxt));
    if (ret == NULL) {
        xmlHTTPErrMemory("allocating context");
        return(NULL);
    }

    memset(ret, 0, sizeof(xmlNanoHTTPCtxt));
    ret->port = 80;
    ret->returnValue = 0;
    ret->fd = -1;
    ret->ContentLength = -1;

    xmlNanoHTTPScanURL(ret, URL);

    return(ret);
}

/**
 * xmlNanoHTTPFreeCtxt:
 * @ctxt:  an HTTP context
 *
 * Frees the context after closing the connection.
 */

static void
xmlNanoHTTPFreeCtxt(xmlNanoHTTPCtxtPtr ctxt) {
    if (ctxt == NULL) return;
    if (ctxt->hostname != NULL) xmlFree(ctxt->hostname);
    if (ctxt->protocol != NULL) xmlFree(ctxt->protocol);
    if (ctxt->path != NULL) xmlFree(ctxt->path);
    if (ctxt->query != NULL) xmlFree(ctxt->query);
    if (ctxt->out != NULL) xmlFree(ctxt->out);
    if (ctxt->in != NULL) xmlFree(ctxt->in);
    if (ctxt->contentType != NULL) xmlFree(ctxt->contentType);
    if (ctxt->encoding != NULL) xmlFree(ctxt->encoding);
    if (ctxt->mimeType != NULL) xmlFree(ctxt->mimeType);
    if (ctxt->location != NULL) xmlFree(ctxt->location);
    if (ctxt->authHeader != NULL) xmlFree(ctxt->authHeader);
#ifdef HAVE_ZLIB_H
    if (ctxt->strm != NULL) {
        inflateEnd(ctxt->strm);
        xmlFree(ctxt->strm);
    }
#endif

    ctxt->state = XML_NANO_HTTP_NONE;
    if (ctxt->fd >= 0) closesocket(ctxt->fd);
    ctxt->fd = -1;
    xmlFree(ctxt);
}

/**
 * xmlNanoHTTPSend:
 * @ctxt:  an HTTP context
 *
 * Send the input needed to initiate the processing on the server side
 * Returns number of bytes sent or -1 on error.
 */

static int
xmlNanoHTTPSend(xmlNanoHTTPCtxtPtr ctxt, const char * xmt_ptr, int outlen) {

    int         total_sent = 0;

    if ( (ctxt->state & XML_NANO_HTTP_WRITE) && (xmt_ptr != NULL ) ) {
        while (total_sent < outlen) {
            int nsent = send(ctxt->fd, xmt_ptr + total_sent,
                                      outlen - total_sent, 0);
            if (nsent>0)
                total_sent += nsent;
            else if ( ( nsent == -1 ) && 
#if defined(EAGAIN) && EAGAIN != EWOULDBLOCK
                      ( socket_errno( ) != EAGAIN ) &&
#endif
                        ( socket_errno( ) != EWOULDBLOCK ) ) {
                __xmlIOErr(XML_FROM_HTTP, 0, "send failed\n");
                if ( total_sent == 0 )
                    total_sent = -1;
                break;
            }
            else {
                /*
                **  No data sent
                **  Since non-blocking sockets are used, wait for 
                **  socket to be writable or default timeout prior
                **  to retrying.
                */

                struct timeval  tv;
                fd_set          wfd;

                tv.tv_sec = timeout;
                tv.tv_usec = 0;
                FD_ZERO( &wfd );
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4018)
#endif
                FD_SET( ctxt->fd, &wfd );
#ifdef _MSC_VER
#pragma warning(pop)
#endif
                (void)select( ctxt->fd + 1, NULL, &wfd, NULL, &tv );
            }
        }
    }

    return total_sent;
}

/**
 * xmlNanoHTTPRecv:
 * @ctxt:  an HTTP context
 *
 * Read information coming from the HTTP connection.
 * This is a blocking call (but it blocks in select(), not read()).
 *
 * Returns the number of byte read or -1 in case of error.
 */

static int
xmlNanoHTTPRecv(xmlNanoHTTPCtxtPtr ctxt) {
    fd_set rfd;
    struct timeval tv;


    while (ctxt->state & XML_NANO_HTTP_READ) {
        if (ctxt->in == NULL) {
            ctxt->in = (char *) xmlMallocAtomic(65000 * sizeof(char));
            if (ctxt->in == NULL) {
                xmlHTTPErrMemory("allocating input");
                ctxt->last = -1;
                return(-1);
            }
            ctxt->inlen = 65000;
            ctxt->inptr = ctxt->content = ctxt->inrptr = ctxt->in;
        }
        if (ctxt->inrptr > ctxt->in + XML_NANO_HTTP_CHUNK) {
            int delta = ctxt->inrptr - ctxt->in;
            int len = ctxt->inptr - ctxt->inrptr;
            
            memmove(ctxt->in, ctxt->inrptr, len);
            ctxt->inrptr -= delta;
            ctxt->content -= delta;
            ctxt->inptr -= delta;
        }
        if ((ctxt->in + ctxt->inlen) < (ctxt->inptr + XML_NANO_HTTP_CHUNK)) {
            int d_inptr = ctxt->inptr - ctxt->in;
            int d_content = ctxt->content - ctxt->in;
            int d_inrptr = ctxt->inrptr - ctxt->in;
            char *      tmp_ptr = ctxt->in;

            ctxt->inlen *= 2;
            ctxt->in = (char *) xmlRealloc(tmp_ptr, ctxt->inlen);
            if (ctxt->in == NULL) {
                xmlHTTPErrMemory("allocating input buffer");
                xmlFree( tmp_ptr );
                ctxt->last = -1;
                return(-1);
            }
            ctxt->inptr = ctxt->in + d_inptr;
            ctxt->content = ctxt->in + d_content;
            ctxt->inrptr = ctxt->in + d_inrptr;
        }
        ctxt->last = recv(ctxt->fd, ctxt->inptr, XML_NANO_HTTP_CHUNK, 0);
        if (ctxt->last > 0) {
            ctxt->inptr += ctxt->last;
            return(ctxt->last);
        }
        if (ctxt->last == 0) {
            return(0);
        }
        if (ctxt->last == -1) {
            switch (socket_errno()) {
                case EINPROGRESS:
                case EWOULDBLOCK:
#if defined(EAGAIN) && EAGAIN != EWOULDBLOCK
                case EAGAIN:
#endif
                    break;

                case ECONNRESET:
                case ESHUTDOWN:
                    return ( 0 );

                default:
                    __xmlIOErr(XML_FROM_HTTP, 0, "recv failed\n");
                    return(-1);
            }
        }

        tv.tv_sec = timeout;
        tv.tv_usec = 0;
        FD_ZERO(&rfd);
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4018)
#endif
        FD_SET(ctxt->fd, &rfd);
#ifdef _MSC_VER
#pragma warning(pop)
#endif
        
        if ( (select(ctxt->fd+1, &rfd, NULL, NULL, &tv)<1)
#if defined(EINTR)
                && (errno != EINTR)
#endif
        )
                return(0);
    }
    return(0);
}

/**
 * xmlNanoHTTPReadLine:
 * @ctxt:  an HTTP context
 *
 * Read one line in the HTTP server output, usually for extracting
 * the HTTP protocol informations from the answer header.
 *
 * Returns a newly allocated string with a copy of the line, or NULL
 *         which indicate the end of the input.
 */

static char *
xmlNanoHTTPReadLine(xmlNanoHTTPCtxtPtr ctxt) {
    char buf[4096];
    char *bp = buf;
    int rc;
    
    while (bp - buf < 4095) {
        if (ctxt->inrptr == ctxt->inptr) {
            if ( (rc = xmlNanoHTTPRecv(ctxt)) == 0) {
                if (bp == buf)
                    return(NULL);
                else
                    *bp = 0;
                return(xmlMemStrdup(buf));
            }
            else if ( rc == -1 ) {
                return ( NULL );
            }
        }
        *bp = *ctxt->inrptr++;
        if (*bp == '\n') {
            *bp = 0;
            return(xmlMemStrdup(buf));
        }
        if (*bp != '\r')
            bp++;
    }
    buf[4095] = 0;
    return(xmlMemStrdup(buf));
}


/**
 * xmlNanoHTTPScanAnswer:
 * @ctxt:  an HTTP context
 * @line:  an HTTP header line
 *
 * Try to extract useful informations from the server answer.
 * We currently parse and process:
 *  - The HTTP revision/ return code
 *  - The Content-Type, Mime-Type and charset used
 *  - The Location for redirect processing.
 *
 * Returns -1 in case of failure, the file descriptor number otherwise
 */

static void
xmlNanoHTTPScanAnswer(xmlNanoHTTPCtxtPtr ctxt, const char *line) {
    const char *cur = line;

    if (line == NULL) return;

    if (!strncmp(line, "HTTP/", 5)) {
        int version = 0;
        int ret = 0;

        cur += 5;
        while ((*cur >= '0') && (*cur <= '9')) {
            version *= 10;
            version += *cur - '0';
            cur++;
        }
        if (*cur == '.') {
            cur++;
            if ((*cur >= '0') && (*cur <= '9')) {
                version *= 10;
                version += *cur - '0';
                cur++;
            }
            while ((*cur >= '0') && (*cur <= '9'))
                cur++;
        } else
            version *= 10;
        if ((*cur != ' ') && (*cur != '\t')) return;
        while ((*cur == ' ') || (*cur == '\t')) cur++;
        if ((*cur < '0') || (*cur > '9')) return;
        while ((*cur >= '0') && (*cur <= '9')) {
            ret *= 10;
            ret += *cur - '0';
            cur++;
        }
        if ((*cur != 0) && (*cur != ' ') && (*cur != '\t')) return;
        ctxt->returnValue = ret;
    } else if (!xmlStrncasecmp(BAD_CAST line, BAD_CAST"Content-Type:", 13)) {
        const xmlChar *charset, *last, *mime;
        cur += 13;
        while ((*cur == ' ') || (*cur == '\t')) cur++;
        if (ctxt->contentType != NULL)
            xmlFree(ctxt->contentType);
        ctxt->contentType = xmlMemStrdup(cur);
        mime = (const xmlChar *) cur;
        last = mime;
        while ((*last != 0) && (*last != ' ') && (*last != '\t') &&
               (*last != ';') && (*last != ','))
            last++;
        if (ctxt->mimeType != NULL)
            xmlFree(ctxt->mimeType);
        ctxt->mimeType = (char *) xmlStrndup(mime, last - mime);
        charset = xmlStrstr(BAD_CAST ctxt->contentType, BAD_CAST "charset=");
        if (charset != NULL) {
            charset += 8;
            last = charset;
            while ((*last != 0) && (*last != ' ') && (*last != '\t') &&
                   (*last != ';') && (*last != ','))
                last++;
            if (ctxt->encoding != NULL)
                xmlFree(ctxt->encoding);
            ctxt->encoding = (char *) xmlStrndup(charset, last - charset);
        }
    } else if (!xmlStrncasecmp(BAD_CAST line, BAD_CAST"ContentType:", 12)) {
        const xmlChar *charset, *last, *mime;
        cur += 12;
        if (ctxt->contentType != NULL) return;
        while ((*cur == ' ') || (*cur == '\t')) cur++;
        ctxt->contentType = xmlMemStrdup(cur);
        mime = (const xmlChar *) cur;
        last = mime;
        while ((*last != 0) && (*last != ' ') && (*last != '\t') &&
               (*last != ';') && (*last != ','))
            last++;
        if (ctxt->mimeType != NULL)
            xmlFree(ctxt->mimeType);
        ctxt->mimeType = (char *) xmlStrndup(mime, last - mime);
        charset = xmlStrstr(BAD_CAST ctxt->contentType, BAD_CAST "charset=");
        if (charset != NULL) {
            charset += 8;
            last = charset;
            while ((*last != 0) && (*last != ' ') && (*last != '\t') &&
                   (*last != ';') && (*last != ','))
                last++;
            if (ctxt->encoding != NULL)
                xmlFree(ctxt->encoding);
            ctxt->encoding = (char *) xmlStrndup(charset, last - charset);
        }
    } else if (!xmlStrncasecmp(BAD_CAST line, BAD_CAST"Location:", 9)) {
        cur += 9;
        while ((*cur == ' ') || (*cur == '\t')) cur++;
        if (ctxt->location != NULL)
            xmlFree(ctxt->location);
        if (*cur == '/') {
            xmlChar *tmp_http = xmlStrdup(BAD_CAST "http://");
            xmlChar *tmp_loc = 
                xmlStrcat(tmp_http, (const xmlChar *) ctxt->hostname);
            ctxt->location = 
                (char *) xmlStrcat (tmp_loc, (const xmlChar *) cur);
        } else {
            ctxt->location = xmlMemStrdup(cur);
        }
    } else if (!xmlStrncasecmp(BAD_CAST line, BAD_CAST"WWW-Authenticate:", 17)) {
        cur += 17;
        while ((*cur == ' ') || (*cur == '\t')) cur++;
        if (ctxt->authHeader != NULL)
            xmlFree(ctxt->authHeader);
        ctxt->authHeader = xmlMemStrdup(cur);
    } else if (!xmlStrncasecmp(BAD_CAST line, BAD_CAST"Proxy-Authenticate:", 19)) {
        cur += 19;
        while ((*cur == ' ') || (*cur == '\t')) cur++;
        if (ctxt->authHeader != NULL)
            xmlFree(ctxt->authHeader);
        ctxt->authHeader = xmlMemStrdup(cur);
#ifdef HAVE_ZLIB_H
    } else if ( !xmlStrncasecmp( BAD_CAST line, BAD_CAST"Content-Encoding:", 17) ) {
        cur += 17;
        while ((*cur == ' ') || (*cur == '\t')) cur++;
        if ( !xmlStrncasecmp( BAD_CAST cur, BAD_CAST"gzip", 4) ) {
            ctxt->usesGzip = 1;

            ctxt->strm = xmlMalloc(sizeof(z_stream));

            if (ctxt->strm != NULL) {
                ctxt->strm->zalloc = Z_NULL;
                ctxt->strm->zfree = Z_NULL;
                ctxt->strm->opaque = Z_NULL;
                ctxt->strm->avail_in = 0;
                ctxt->strm->next_in = Z_NULL;

                inflateInit2( ctxt->strm, 31 );
            }
        }
#endif
    } else if ( !xmlStrncasecmp( BAD_CAST line, BAD_CAST"Content-Length:", 15) ) {
        cur += 15;
        ctxt->ContentLength = strtol( cur, NULL, 10 );
    }
}

/**
 * xmlNanoHTTPConnectAttempt:
 * @addr:  a socket address structure
 *
 * Attempt a connection to the given IP:port endpoint. It forces
 * non-blocking semantic on the socket, and allow 60 seconds for
 * the host to answer.
 *
 * Returns -1 in case of failure, the file descriptor number otherwise
 */

static int
xmlNanoHTTPConnectAttempt(struct sockaddr *addr)
{
    fd_set wfd;
#ifdef _WINSOCKAPI_
    fd_set xfd;
#endif
    struct timeval tv;
    int status;
    int addrlen;
    SOCKET s;
    
#ifdef SUPPORT_IP6
    if (addr->sa_family == AF_INET6) {
        s = socket (PF_INET6, SOCK_STREAM, IPPROTO_TCP);
        addrlen = sizeof (struct sockaddr_in6);
    }
    else
#endif
    {
        s = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
        addrlen = sizeof (struct sockaddr_in);
    }
    if (s==-1) {
#ifdef DEBUG_HTTP
        perror("socket");
#endif
        __xmlIOErr(XML_FROM_HTTP, 0, "socket failed\n");
        return(-1);
    }
    
#ifdef _WINSOCKAPI_
    {
        u_long one = 1;

        status = ioctlsocket(s, FIONBIO, &one) == SOCKET_ERROR ? -1 : 0;
    }
#else /* _WINSOCKAPI_ */
#if defined(VMS)
    {
        int enable = 1;
        status = ioctl(s, FIONBIO, &enable);
    }
#else /* VMS */
#if defined(__BEOS__)
        {
                bool noblock = true;
                status = setsockopt(s, SOL_SOCKET, SO_NONBLOCK, &noblock, sizeof(noblock));
        }
#else /* __BEOS__ */
    if ((status = fcntl(s, F_GETFL, 0)) != -1) {
#ifdef O_NONBLOCK
        status |= O_NONBLOCK;
#else /* O_NONBLOCK */
#ifdef F_NDELAY
        status |= F_NDELAY;
#endif /* F_NDELAY */
#endif /* !O_NONBLOCK */
        status = fcntl(s, F_SETFL, status);
    }
    if (status < 0) {
#ifdef DEBUG_HTTP
        perror("nonblocking");
#endif
        __xmlIOErr(XML_FROM_HTTP, 0, "error setting non-blocking IO\n");
        closesocket(s);
        return(-1);
    }
#endif /* !__BEOS__ */
#endif /* !VMS */
#endif /* !_WINSOCKAPI_ */

    if (connect (s, addr, addrlen) == -1) {
        switch (socket_errno()) {
            case EINPROGRESS:
            case EWOULDBLOCK:
                break;
            default:
                __xmlIOErr(XML_FROM_HTTP, 0, "error connecting to HTTP server");
                closesocket(s);
                return(-1);
        }
    }   
    
    tv.tv_sec = timeout;
    tv.tv_usec = 0;

#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4018)
#endif
    FD_ZERO(&wfd);
    FD_SET(s, &wfd);

#ifdef _WINSOCKAPI_    
    FD_ZERO(&xfd);
    FD_SET(s, &xfd);
    
    switch(select(s+1, NULL, &wfd, &xfd, &tv))
#else
    switch(select(s+1, NULL, &wfd, NULL, &tv))
#endif
#ifdef _MSC_VER
#pragma warning(pop)
#endif
    {
        case 0:
            /* Time out */
            __xmlIOErr(XML_FROM_HTTP, 0, "Connect attempt timed out");
            closesocket(s);
            return(-1);
        case -1:
            /* Ermm.. ?? */
            __xmlIOErr(XML_FROM_HTTP, 0, "Connect failed");
            closesocket(s);
            return(-1);
    }

    if ( FD_ISSET(s, &wfd)
#ifdef _WINSOCKAPI_
                           || FD_ISSET(s, &xfd)
#endif
                                                ) {
        XML_SOCKLEN_T len;
        len = sizeof(status);
#ifdef SO_ERROR
        if (getsockopt(s, SOL_SOCKET, SO_ERROR, (char*)&status, &len) < 0 ) {
            /* Solaris error code */
            __xmlIOErr(XML_FROM_HTTP, 0, "getsockopt failed\n");
            return (-1);
        }
#endif
        if ( status ) {
            __xmlIOErr(XML_FROM_HTTP, 0, "Error connecting to remote host");
            closesocket(s);
            errno = status;
            return (-1);
        }
    } else {
        /* pbm */
        __xmlIOErr(XML_FROM_HTTP, 0, "select failed\n");
        closesocket(s);
        return (-1);
    }
    
    return(s);
}
 
/**
 * xmlNanoHTTPConnectHost:
 * @host:  the host name
 * @port:  the port number
 *
 * Attempt a connection to the given host:port endpoint. It tries
 * the multiple IP provided by the DNS if available.
 *
 * Returns -1 in case of failure, the file descriptor number otherwise
 */

static int
xmlNanoHTTPConnectHost(const char *host, int port)
{
    struct hostent *h;
    struct sockaddr *addr = NULL;
    struct in_addr ia;
    struct sockaddr_in sockin;

#ifdef SUPPORT_IP6
    struct in6_addr ia6;
    struct sockaddr_in6 sockin6;
#endif
    int i;
    int s;

    memset (&sockin, 0, sizeof(sockin));
#ifdef SUPPORT_IP6
    memset (&sockin6, 0, sizeof(sockin6));
#endif

#if !defined(HAVE_GETADDRINFO) && defined(SUPPORT_IP6) && defined(RES_USE_INET6)
    if (have_ipv6 ())
    {
        if (!(_res.options & RES_INIT))
            res_init();
        _res.options |= RES_USE_INET6;
    }
#endif

#if defined(HAVE_GETADDRINFO) && defined(SUPPORT_IP6) && !defined(_WIN32)
    if (have_ipv6 ())
#endif
#if defined(HAVE_GETADDRINFO) && (defined(SUPPORT_IP6) || defined(_WIN32))
    {
        int status;
        struct addrinfo hints, *res, *result;

        result = NULL;
        memset (&hints, 0,sizeof(hints));
        hints.ai_socktype = SOCK_STREAM;

        status = getaddrinfo (host, NULL, &hints, &result);
        if (status) {
            __xmlIOErr(XML_FROM_HTTP, 0, "getaddrinfo failed\n");
            return (-1);
        }

        for (res = result; res; res = res->ai_next) {
            if (res->ai_family == AF_INET) {
                if (res->ai_addrlen > sizeof(sockin)) {
                    __xmlIOErr(XML_FROM_HTTP, 0, "address size mismatch\n");
                    freeaddrinfo (result);
                    return (-1);
                }
                memcpy (&sockin, res->ai_addr, res->ai_addrlen);
                sockin.sin_port = htons (port);
                addr = (struct sockaddr *)&sockin;
#ifdef SUPPORT_IP6
            } else if (have_ipv6 () && (res->ai_family == AF_INET6)) {
                if (res->ai_addrlen > sizeof(sockin6)) {
                    __xmlIOErr(XML_FROM_HTTP, 0, "address size mismatch\n");
                    freeaddrinfo (result);
                    return (-1);
                }
                memcpy (&sockin6, res->ai_addr, res->ai_addrlen);
                sockin6.sin6_port = htons (port);
                addr = (struct sockaddr *)&sockin6;
#endif
            } else
                continue;              /* for */

            s = xmlNanoHTTPConnectAttempt (addr);
            if (s != -1) {
                freeaddrinfo (result);
                return (s);
            }
        }

        if (result)
            freeaddrinfo (result);
    }
#endif
#if defined(HAVE_GETADDRINFO) && defined(SUPPORT_IP6) && !defined(_WIN32)
    else
#endif
#if !defined(HAVE_GETADDRINFO) || !defined(_WIN32)
    {
        h = gethostbyname (host);
        if (h == NULL) {

/*
 * Okay, I got fed up by the non-portability of this error message
 * extraction code. it work on Linux, if it work on your platform
 * and one want to enable it, send me the defined(foobar) needed
 */
#if defined(HAVE_NETDB_H) && defined(HOST_NOT_FOUND) && defined(linux)
            const char *h_err_txt = "";

            switch (h_errno) {
                case HOST_NOT_FOUND:
                    h_err_txt = "Authoritive host not found";
                    break;

                case TRY_AGAIN:
                    h_err_txt =
                        "Non-authoritive host not found or server failure.";
                    break;

                case NO_RECOVERY:
                    h_err_txt =
                        "Non-recoverable errors:  FORMERR, REFUSED, or NOTIMP.";
                    break;

                case NO_ADDRESS:
                    h_err_txt =
                        "Valid name, no data record of requested type.";
                    break;

                default:
                    h_err_txt = "No error text defined.";
                    break;
            }
            __xmlIOErr(XML_FROM_HTTP, 0, h_err_txt);
#else
            __xmlIOErr(XML_FROM_HTTP, 0, "Failed to resolve host");
#endif
            return (-1);
        }

        for (i = 0; h->h_addr_list[i]; i++) {
            if (h->h_addrtype == AF_INET) {
                /* A records (IPv4) */
                if ((unsigned int) h->h_length > sizeof(ia)) {
                    __xmlIOErr(XML_FROM_HTTP, 0, "address size mismatch\n");
                    return (-1);
                }
                memcpy (&ia, h->h_addr_list[i], h->h_length);
                sockin.sin_family = h->h_addrtype;
                sockin.sin_addr = ia;
                sockin.sin_port = (u_short)htons ((unsigned short)port);
                addr = (struct sockaddr *) &sockin;
#ifdef SUPPORT_IP6
            } else if (have_ipv6 () && (h->h_addrtype == AF_INET6)) {
                /* AAAA records (IPv6) */
                if ((unsigned int) h->h_length > sizeof(ia6)) {
                    __xmlIOErr(XML_FROM_HTTP, 0, "address size mismatch\n");
                    return (-1);
                }
                memcpy (&ia6, h->h_addr_list[i], h->h_length);
                sockin6.sin6_family = h->h_addrtype;
                sockin6.sin6_addr = ia6;
                sockin6.sin6_port = htons (port);
                addr = (struct sockaddr *) &sockin6;
#endif
            } else
                break;              /* for */

            s = xmlNanoHTTPConnectAttempt (addr);
            if (s != -1)
                return (s);
        }
    }
#endif

#ifdef DEBUG_HTTP
    xmlGenericError(xmlGenericErrorContext,
                    "xmlNanoHTTPConnectHost:  unable to connect to '%s'.\n",
                    host);
#endif
    return (-1);
}


/**
 * xmlNanoHTTPOpen:
 * @URL:  The URL to load
 * @contentType:  if available the Content-Type information will be
 *                returned at that location
 *
 * This function try to open a connection to the indicated resource
 * via HTTP GET.
 *
 * Returns NULL in case of failure, otherwise a request handler.
 *     The contentType, if provided must be freed by the caller
 */

void*
xmlNanoHTTPOpen(const char *URL, char **contentType) {
    if (contentType != NULL) *contentType = NULL;
    return(xmlNanoHTTPMethod(URL, NULL, NULL, contentType, NULL, 0));
}

/**
 * xmlNanoHTTPOpenRedir:
 * @URL:  The URL to load
 * @contentType:  if available the Content-Type information will be
 *                returned at that location
 * @redir: if available the redirected URL will be returned
 *
 * This function try to open a connection to the indicated resource
 * via HTTP GET.
 *
 * Returns NULL in case of failure, otherwise a request handler.
 *     The contentType, if provided must be freed by the caller
 */

void*
xmlNanoHTTPOpenRedir(const char *URL, char **contentType, char **redir) {
    if (contentType != NULL) *contentType = NULL;
    if (redir != NULL) *redir = NULL;
    return(xmlNanoHTTPMethodRedir(URL, NULL, NULL, contentType, redir, NULL,0));
}

/**
 * xmlNanoHTTPRead:
 * @ctx:  the HTTP context
 * @dest:  a buffer
 * @len:  the buffer length
 *
 * This function tries to read @len bytes from the existing HTTP connection
 * and saves them in @dest. This is a blocking call.
 *
 * Returns the number of byte read. 0 is an indication of an end of connection.
 *         -1 indicates a parameter error.
 */
int
xmlNanoHTTPRead(void *ctx, void *dest, int len) {
    xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr) ctx;
#ifdef HAVE_ZLIB_H
    int bytes_read = 0;
    int orig_avail_in;
    int z_ret;
#endif

    if (ctx == NULL) return(-1);
    if (dest == NULL) return(-1);
    if (len <= 0) return(0);

#ifdef HAVE_ZLIB_H
    if (ctxt->usesGzip == 1) {
        if (ctxt->strm == NULL) return(0);
 
        ctxt->strm->next_out = dest;
        ctxt->strm->avail_out = len;

        do {
            orig_avail_in = ctxt->strm->avail_in = ctxt->inptr - ctxt->inrptr - bytes_read;
            ctxt->strm->next_in = BAD_CAST (ctxt->inrptr + bytes_read);

            z_ret = inflate(ctxt->strm, Z_NO_FLUSH);
            bytes_read += orig_avail_in - ctxt->strm->avail_in;

            if (z_ret != Z_OK) break;
        } while (ctxt->strm->avail_out > 0 && xmlNanoHTTPRecv(ctxt) > 0);

        ctxt->inrptr += bytes_read;
        return(len - ctxt->strm->avail_out);
    }
#endif

    while (ctxt->inptr - ctxt->inrptr < len) {
        if (xmlNanoHTTPRecv(ctxt) <= 0) break;
    }
    if (ctxt->inptr - ctxt->inrptr < len)
        len = ctxt->inptr - ctxt->inrptr;
    memcpy(dest, ctxt->inrptr, len);
    ctxt->inrptr += len;
    return(len);
}

/**
 * xmlNanoHTTPClose:
 * @ctx:  the HTTP context
 *
 * This function closes an HTTP context, it ends up the connection and
 * free all data related to it.
 */
void
xmlNanoHTTPClose(void *ctx) {
    xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr) ctx;

    if (ctx == NULL) return;

    xmlNanoHTTPFreeCtxt(ctxt);
}

/**
 * xmlNanoHTTPMethodRedir:
 * @URL:  The URL to load
 * @method:  the HTTP method to use
 * @input:  the input string if any
 * @contentType:  the Content-Type information IN and OUT
 * @redir:  the redirected URL OUT
 * @headers:  the extra headers
 * @ilen:  input length
 *
 * This function try to open a connection to the indicated resource
 * via HTTP using the given @method, adding the given extra headers
 * and the input buffer for the request content.
 *
 * Returns NULL in case of failure, otherwise a request handler.
 *     The contentType, or redir, if provided must be freed by the caller
 */

void*
xmlNanoHTTPMethodRedir(const char *URL, const char *method, const char *input,
                  char **contentType, char **redir,
                  const char *headers, int ilen ) {
    xmlNanoHTTPCtxtPtr ctxt;
    char *bp, *p;
    int blen, ret;
    int head;
    int nbRedirects = 0;
    char *redirURL = NULL;
#ifdef DEBUG_HTTP
    int xmt_bytes;
#endif
    
    if (URL == NULL) return(NULL);
    if (method == NULL) method = "GET";
    xmlNanoHTTPInit();

retry:
    if (redirURL == NULL)
        ctxt = xmlNanoHTTPNewCtxt(URL);
    else {
        ctxt = xmlNanoHTTPNewCtxt(redirURL);
        ctxt->location = xmlMemStrdup(redirURL);
    }

    if ( ctxt == NULL ) {
        return ( NULL );
    }

    if ((ctxt->protocol == NULL) || (strcmp(ctxt->protocol, "http"))) {
        __xmlIOErr(XML_FROM_HTTP, XML_HTTP_URL_SYNTAX, "Not a valid HTTP URI");
        xmlNanoHTTPFreeCtxt(ctxt);
        if (redirURL != NULL) xmlFree(redirURL);
        return(NULL);
    }
    if (ctxt->hostname == NULL) {
        __xmlIOErr(XML_FROM_HTTP, XML_HTTP_UNKNOWN_HOST,
                   "Failed to identify host in URI");
        xmlNanoHTTPFreeCtxt(ctxt);
        if (redirURL != NULL) xmlFree(redirURL);
        return(NULL);
    }
    if (proxy) {
        blen = strlen(ctxt->hostname) * 2 + 16;
        ret = xmlNanoHTTPConnectHost(proxy, proxyPort);
    }
    else {
        blen = strlen(ctxt->hostname);
        ret = xmlNanoHTTPConnectHost(ctxt->hostname, ctxt->port);
    }
    if (ret < 0) {
        xmlNanoHTTPFreeCtxt(ctxt);
        if (redirURL != NULL) xmlFree(redirURL);
        return(NULL);
    }
    ctxt->fd = ret;

    if (input == NULL)
        ilen = 0;
    else
        blen += 36;

    if (headers != NULL)
        blen += strlen(headers) + 2;
    if (contentType && *contentType)
        blen += strlen(*contentType) + 16;
    if (ctxt->query != NULL)
        blen += strlen(ctxt->query) + 1;
    blen += strlen(method) + strlen(ctxt->path) + 24;
#ifdef HAVE_ZLIB_H
    blen += 23;
#endif
    bp = (char*)xmlMallocAtomic(blen);
    if ( bp == NULL ) {
        xmlNanoHTTPFreeCtxt( ctxt );
        xmlHTTPErrMemory("allocating header buffer");
        return ( NULL );
    }

    p = bp;

    if (proxy) {
        if (ctxt->port != 80) {
            p += snprintf( p, blen - (p - bp), "%s http://%s:%d%s", 
                        method, ctxt->hostname,
                        ctxt->port, ctxt->path );
        }
        else 
            p += snprintf( p, blen - (p - bp), "%s http://%s%s", method,
                        ctxt->hostname, ctxt->path);
    }
    else
        p += snprintf( p, blen - (p - bp), "%s %s", method, ctxt->path);

    if (ctxt->query != NULL)
        p += snprintf( p, blen - (p - bp), "?%s", ctxt->query);

    p += snprintf( p, blen - (p - bp), " HTTP/1.0\r\nHost: %s\r\n", 
                    ctxt->hostname);

#ifdef HAVE_ZLIB_H
    p += snprintf(p, blen - (p - bp), "Accept-Encoding: gzip\r\n");
#endif

    if (contentType != NULL && *contentType) 
        p += snprintf(p, blen - (p - bp), "Content-Type: %s\r\n", *contentType);

    if (headers != NULL)
        p += snprintf( p, blen - (p - bp), "%s", headers );

    if (input != NULL)
        snprintf(p, blen - (p - bp), "Content-Length: %d\r\n\r\n", ilen );
    else
        snprintf(p, blen - (p - bp), "\r\n");

#ifdef DEBUG_HTTP
    xmlGenericError(xmlGenericErrorContext,
            "-> %s%s", proxy? "(Proxy) " : "", bp);
    if ((blen -= strlen(bp)+1) < 0)
        xmlGenericError(xmlGenericErrorContext,
                "ERROR: overflowed buffer by %d bytes\n", -blen);
#endif
    ctxt->outptr = ctxt->out = bp;
    ctxt->state = XML_NANO_HTTP_WRITE;
    blen = strlen( ctxt->out );
#ifdef DEBUG_HTTP
    xmt_bytes = xmlNanoHTTPSend(ctxt, ctxt->out, blen );
    if ( xmt_bytes != blen )
        xmlGenericError( xmlGenericErrorContext,
                        "xmlNanoHTTPMethodRedir:  Only %d of %d %s %s\n",
                        xmt_bytes, blen,
                        "bytes of HTTP headers sent to host",
                        ctxt->hostname );
#else
    xmlNanoHTTPSend(ctxt, ctxt->out, blen );
#endif

    if ( input != NULL ) {
#ifdef DEBUG_HTTP
        xmt_bytes = xmlNanoHTTPSend( ctxt, input, ilen );

        if ( xmt_bytes != ilen )
            xmlGenericError( xmlGenericErrorContext,
                        "xmlNanoHTTPMethodRedir:  Only %d of %d %s %s\n",
                        xmt_bytes, ilen,
                        "bytes of HTTP content sent to host",
                        ctxt->hostname );
#else
        xmlNanoHTTPSend( ctxt, input, ilen );
#endif
    }

    ctxt->state = XML_NANO_HTTP_READ;
    head = 1;

    while ((p = xmlNanoHTTPReadLine(ctxt)) != NULL) {
        if (head && (*p == 0)) {
            head = 0;
            ctxt->content = ctxt->inrptr;
            xmlFree(p);
            break;
        }
        xmlNanoHTTPScanAnswer(ctxt, p);

#ifdef DEBUG_HTTP
        xmlGenericError(xmlGenericErrorContext, "<- %s\n", p);
#endif
        xmlFree(p);
    }

    if ((ctxt->location != NULL) && (ctxt->returnValue >= 300) &&
        (ctxt->returnValue < 400)) {
#ifdef DEBUG_HTTP
        xmlGenericError(xmlGenericErrorContext,
                "\nRedirect to: %s\n", ctxt->location);
#endif
        while ( xmlNanoHTTPRecv(ctxt) > 0 ) ;
        if (nbRedirects < XML_NANO_HTTP_MAX_REDIR) {
            nbRedirects++;
            if (redirURL != NULL)
                xmlFree(redirURL);
            redirURL = xmlMemStrdup(ctxt->location);
            xmlNanoHTTPFreeCtxt(ctxt);
            goto retry;
        }
        xmlNanoHTTPFreeCtxt(ctxt);
        if (redirURL != NULL) xmlFree(redirURL);
#ifdef DEBUG_HTTP
        xmlGenericError(xmlGenericErrorContext,
                "xmlNanoHTTPMethodRedir: Too many redirects, aborting ...\n");
#endif
        return(NULL);
    }

    if (contentType != NULL) {
        if (ctxt->contentType != NULL)
            *contentType = xmlMemStrdup(ctxt->contentType);
        else
            *contentType = NULL;
    }

    if ((redir != NULL) && (redirURL != NULL)) {
        *redir = redirURL;
    } else {
        if (redirURL != NULL)
            xmlFree(redirURL);
        if (redir != NULL)
            *redir = NULL;
    }

#ifdef DEBUG_HTTP
    if (ctxt->contentType != NULL)
        xmlGenericError(xmlGenericErrorContext,
                "\nCode %d, content-type '%s'\n\n",
               ctxt->returnValue, ctxt->contentType);
    else
        xmlGenericError(xmlGenericErrorContext,
                "\nCode %d, no content-type\n\n",
               ctxt->returnValue);
#endif

    return((void *) ctxt);
}

/**
 * xmlNanoHTTPMethod:
 * @URL:  The URL to load
 * @method:  the HTTP method to use
 * @input:  the input string if any
 * @contentType:  the Content-Type information IN and OUT
 * @headers:  the extra headers
 * @ilen:  input length
 *
 * This function try to open a connection to the indicated resource
 * via HTTP using the given @method, adding the given extra headers
 * and the input buffer for the request content.
 *
 * Returns NULL in case of failure, otherwise a request handler.
 *     The contentType, if provided must be freed by the caller
 */

void*
xmlNanoHTTPMethod(const char *URL, const char *method, const char *input,
                  char **contentType, const char *headers, int ilen) {
    return(xmlNanoHTTPMethodRedir(URL, method, input, contentType,
                                  NULL, headers, ilen));
}

/**
 * xmlNanoHTTPFetch:
 * @URL:  The URL to load
 * @filename:  the filename where the content should be saved
 * @contentType:  if available the Content-Type information will be
 *                returned at that location
 *
 * This function try to fetch the indicated resource via HTTP GET
 * and save it's content in the file.
 *
 * Returns -1 in case of failure, 0 incase of success. The contentType,
 *     if provided must be freed by the caller
 */
int
xmlNanoHTTPFetch(const char *URL, const char *filename, char **contentType) {
    void *ctxt = NULL;
    char *buf = NULL;
    int fd;
    int len;
    
    if (filename == NULL) return(-1);
    ctxt = xmlNanoHTTPOpen(URL, contentType);
    if (ctxt == NULL) return(-1);

    if (!strcmp(filename, "-")) 
        fd = 0;
    else {
        fd = open(filename, O_CREAT | O_WRONLY, 00644);
        if (fd < 0) {
            xmlNanoHTTPClose(ctxt);
            if ((contentType != NULL) && (*contentType != NULL)) {
                xmlFree(*contentType);
                *contentType = NULL;
            }
            return(-1);
        }
    }

    xmlNanoHTTPFetchContent( ctxt, &buf, &len );
    if ( len > 0 ) {
        write(fd, buf, len);
    }

    xmlNanoHTTPClose(ctxt);
    close(fd);
    return(0);
}

#ifdef LIBXML_OUTPUT_ENABLED
/**
 * xmlNanoHTTPSave:
 * @ctxt:  the HTTP context
 * @filename:  the filename where the content should be saved
 *
 * This function saves the output of the HTTP transaction to a file
 * It closes and free the context at the end
 *
 * Returns -1 in case of failure, 0 incase of success.
 */
int
xmlNanoHTTPSave(void *ctxt, const char *filename) {
    char *buf = NULL;
    int fd;
    int len;
    
    if ((ctxt == NULL) || (filename == NULL)) return(-1);

    if (!strcmp(filename, "-")) 
        fd = 0;
    else {
        fd = open(filename, O_CREAT | O_WRONLY);
        if (fd < 0) {
            xmlNanoHTTPClose(ctxt);
            return(-1);
        }
    }

    xmlNanoHTTPFetchContent( ctxt, &buf, &len );
    if ( len > 0 ) {
        write(fd, buf, len);
    }

    xmlNanoHTTPClose(ctxt);
    close(fd);
    return(0);
}
#endif /* LIBXML_OUTPUT_ENABLED */

/**
 * xmlNanoHTTPReturnCode:
 * @ctx:  the HTTP context
 *
 * Get the latest HTTP return code received
 *
 * Returns the HTTP return code for the request.
 */
int
xmlNanoHTTPReturnCode(void *ctx) {
    xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr) ctx;

    if (ctxt == NULL) return(-1);

    return(ctxt->returnValue);
}

/**
 * xmlNanoHTTPAuthHeader:
 * @ctx:  the HTTP context
 *
 * Get the authentication header of an HTTP context
 *
 * Returns the stashed value of the WWW-Authenticate or Proxy-Authenticate
 * header.
 */
const char *
xmlNanoHTTPAuthHeader(void *ctx) {
    xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr) ctx;

    if (ctxt == NULL) return(NULL);

    return(ctxt->authHeader);
}

/**
 * xmlNanoHTTPContentLength:
 * @ctx:  the HTTP context
 *
 * Provides the specified content length from the HTTP header.
 *
 * Return the specified content length from the HTTP header.  Note that
 * a value of -1 indicates that the content length element was not included in
 * the response header.
 */
int
xmlNanoHTTPContentLength( void * ctx ) {
    xmlNanoHTTPCtxtPtr  ctxt = (xmlNanoHTTPCtxtPtr)ctx;

    return ( ( ctxt == NULL ) ? -1 : ctxt->ContentLength );
}

/**
 * xmlNanoHTTPRedir:
 * @ctx:  the HTTP context
 *
 * Provides the specified redirection URL if available from the HTTP header.
 *
 * Return the specified redirection URL or NULL if not redirected.
 */
const char *
xmlNanoHTTPRedir( void * ctx ) {
    xmlNanoHTTPCtxtPtr  ctxt = (xmlNanoHTTPCtxtPtr)ctx;

    return ( ( ctxt == NULL ) ? NULL : ctxt->location );
}

/**
 * xmlNanoHTTPEncoding:
 * @ctx:  the HTTP context
 *
 * Provides the specified encoding if specified in the HTTP headers.
 *
 * Return the specified encoding or NULL if not available
 */
const char *
xmlNanoHTTPEncoding( void * ctx ) {
    xmlNanoHTTPCtxtPtr  ctxt = (xmlNanoHTTPCtxtPtr)ctx;

    return ( ( ctxt == NULL ) ? NULL : ctxt->encoding );
}

/**
 * xmlNanoHTTPMimeType:
 * @ctx:  the HTTP context
 *
 * Provides the specified Mime-Type if specified in the HTTP headers.
 *
 * Return the specified Mime-Type or NULL if not available
 */
const char *
xmlNanoHTTPMimeType( void * ctx ) {
    xmlNanoHTTPCtxtPtr  ctxt = (xmlNanoHTTPCtxtPtr)ctx;

    return ( ( ctxt == NULL ) ? NULL : ctxt->mimeType );
}

/**
 * xmlNanoHTTPFetchContent:
 * @ctx:  the HTTP context
 * @ptr:  pointer to set to the content buffer.
 * @len:  integer pointer to hold the length of the content
 *
 * Check if all the content was read
 *
 * Returns 0 if all the content was read and available, returns
 * -1 if received content length was less than specified or an error 
 * occurred.
 */
static int
xmlNanoHTTPFetchContent( void * ctx, char ** ptr, int * len ) {
    xmlNanoHTTPCtxtPtr  ctxt = (xmlNanoHTTPCtxtPtr)ctx;

    int                 rc = 0;
    int                 cur_lgth;
    int                 rcvd_lgth;
    int                 dummy_int;
    char *              dummy_ptr = NULL;

    /*  Dummy up return input parameters if not provided  */

    if ( len == NULL )
        len = &dummy_int;

    if ( ptr == NULL )
        ptr = &dummy_ptr;

    /*  But can't work without the context pointer  */

    if ( ( ctxt == NULL ) || ( ctxt->content == NULL ) ) {
        *len = 0;
        *ptr = NULL;
        return ( -1 );
    }

    rcvd_lgth = ctxt->inptr - ctxt->content;

    while ( (cur_lgth = xmlNanoHTTPRecv( ctxt )) > 0 ) {

        rcvd_lgth += cur_lgth;
        if ( (ctxt->ContentLength > 0) && (rcvd_lgth >= ctxt->ContentLength) )
            break;
    }

    *ptr = ctxt->content;
    *len = rcvd_lgth;

    if ( ( ctxt->ContentLength > 0 ) && ( rcvd_lgth < ctxt->ContentLength ) )
        rc = -1;
    else if ( rcvd_lgth == 0 )
        rc = -1;

    return ( rc );
}

#ifdef STANDALONE
int main(int argc, char **argv) {
    char *contentType = NULL;

    if (argv[1] != NULL) {
        if (argv[2] != NULL) 
            xmlNanoHTTPFetch(argv[1], argv[2], &contentType);
        else
            xmlNanoHTTPFetch(argv[1], "-", &contentType);
        if (contentType != NULL) xmlFree(contentType);
    } else {
        xmlGenericError(xmlGenericErrorContext,
                "%s: minimal HTTP GET implementation\n", argv[0]);
        xmlGenericError(xmlGenericErrorContext,
                "\tusage %s [ URL [ filename ] ]\n", argv[0]);
    }
    xmlNanoHTTPCleanup();
    xmlMemoryDump();
    return(0);
}
#endif /* STANDALONE */
#else /* !LIBXML_HTTP_ENABLED */
#ifdef STANDALONE
#include <stdio.h>
int main(int argc, char **argv) {
    xmlGenericError(xmlGenericErrorContext,
            "%s : HTTP support not compiled in\n", argv[0]);
    return(0);
}
#endif /* STANDALONE */
#endif /* LIBXML_HTTP_ENABLED */
#define bottom_nanohttp
#include "elfgcchack.h"