Upgrade to libxml 2.9.2 and libxslt 1.1.28

third_party/libxml/src/nanohttp.c

+/*
+ * 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
+#ifndef HAVE_POLL_H
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+#else
+#include <poll.h>
+#endif
+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
+#ifdef HAVE_ZLIB_H
+#include <zlib.h>
+#endif
+
+
+#ifdef VMS
+#include <stropts>
+#define XML_SOCKLEN_T unsigned int
+#endif
+
+#if defined(__MINGW32__) || defined(_WIN32_WCE)
+#ifndef _WINSOCKAPI_
+#define _WINSOCKAPI_
+#endif
+#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_
+#if !defined(__BEOS__) || defined(__HAIKU__)
+#define closesocket(s) close(s)
+#endif
+#define SOCKET int
+#define INVALID_SOCKET (-1)
+#endif
+
+#ifdef __BEOS__
+#ifndef PF_INET
+#define PF_INET AF_INET
+#endif
+#endif
+
+#ifndef XML_SOCKLEN_T
+#define XML_SOCKLEN_T unsigned 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 version;        /* the protocol version */
+    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) {
+    SOCKET s;
+
+    s = socket (AF_INET6, SOCK_STREAM, 0);
+    if (s != INVALID_SOCKET) {
+        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;
+    int len;
+
+    /*
+     * 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);
+    /* special case of IPv6 addresses, the [] need to be removed */
+    if ((uri->server != NULL) && (*uri->server == '[')) {
+        len = strlen(uri->server);
+        if ((len > 2) && (uri->server[len - 1] == ']')) {
+            ctxt->hostname = (char *) xmlCharStrndup(uri->server + 1, len -2);
+        } else
+            ctxt->hostname = xmlMemStrdup(uri->server);
+    } else
+        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 = INVALID_SOCKET;
+    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 != INVALID_SOCKET) closesocket(ctxt->fd);
+    ctxt->fd = INVALID_SOCKET;
+    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;
+#ifdef HAVE_POLL_H
+    struct pollfd p;
+#else
+    struct timeval tv;
+    fd_set wfd;
+#endif
+
+    if ((ctxt->state & XML_NANO_HTTP_WRITE) && (xmt_ptr != NULL)) {
+        while (total_sent < outlen) {
+            int nsent = send(ctxt->fd, SEND_ARG2_CAST (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.
+                 */
+#ifndef HAVE_POLL_H
+#ifndef _WINSOCKAPI_
+                if (ctxt->fd > FD_SETSIZE)
+                    return -1;
+#endif
+
+                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);
+#else
+                p.fd = ctxt->fd;
+                p.events = POLLOUT;
+                (void) poll(&p, 1, timeout * 1000);
+#endif /* !HAVE_POLL_H */
+            }
+        }
+    }
+
+    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)
+{
+#ifdef HAVE_POLL_H
+    struct pollfd p;
+#else
+    fd_set rfd;
+    struct timeval tv;
+#endif
+
+
+    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);
+            }
+        }
+#ifdef HAVE_POLL_H
+        p.fd = ctxt->fd;
+        p.events = POLLIN;
+        if ((poll(&p, 1, timeout * 1000) < 1)
+#if defined(EINTR)
+            && (errno != EINTR)
+#endif
+            )
+            return (0);
+#else /* !HAVE_POLL_H */
+#ifndef _WINSOCKAPI_
+        if (ctxt->fd > FD_SETSIZE)
+            return 0;
+#endif
+
+        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);
+#endif /* !HAVE_POLL_H */
+    }
+    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;
+        ctxt->version = version;
+    } 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 SOCKET
+xmlNanoHTTPConnectAttempt(struct sockaddr *addr)
+{
+#ifndef HAVE_POLL_H
+    fd_set wfd;
+#ifdef _WINSOCKAPI_
+    fd_set xfd;
+#endif
+    struct timeval tv;
+#else /* !HAVE_POLL_H */
+    struct pollfd p;
+#endif /* !HAVE_POLL_H */
+    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 == INVALID_SOCKET) {
+#ifdef DEBUG_HTTP
+        perror("socket");
+#endif
+        __xmlIOErr(XML_FROM_HTTP, 0, "socket failed\n");
+        return INVALID_SOCKET;
+    }
+#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__) && !defined(__HAIKU__)
+    {
+        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 INVALID_SOCKET;
+    }
+#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 INVALID_SOCKET;
+        }
+    }
+#ifndef HAVE_POLL_H
+    tv.tv_sec = timeout;
+    tv.tv_usec = 0;
+
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable: 4018)
+#endif
+#ifndef _WINSOCKAPI_
+    if (s > FD_SETSIZE)
+        return INVALID_SOCKET;
+#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
+
+#else /* !HAVE_POLL_H */
+    p.fd = s;
+    p.events = POLLOUT;
+    switch (poll(&p, 1, timeout * 1000))
+#endif /* !HAVE_POLL_H */
+
+    {
+        case 0:
+            /* Time out */
+            __xmlIOErr(XML_FROM_HTTP, 0, "Connect attempt timed out");
+            closesocket(s);
+            return INVALID_SOCKET;
+        case -1:
+            /* Ermm.. ?? */
+            __xmlIOErr(XML_FROM_HTTP, 0, "Connect failed");
+            closesocket(s);
+            return INVALID_SOCKET;
+    }
+
+#ifndef HAVE_POLL_H
+    if (FD_ISSET(s, &wfd)
+#ifdef _WINSOCKAPI_
+        || FD_ISSET(s, &xfd)
+#endif
+        )
+#else /* !HAVE_POLL_H */
+    if (p.revents == POLLOUT)
+#endif /* !HAVE_POLL_H */
+    {
+        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");
+            closesocket(s);
+            return INVALID_SOCKET;
+        }
+#endif
+        if (status) {
+            __xmlIOErr(XML_FROM_HTTP, 0,
+                       "Error connecting to remote host");
+            closesocket(s);
+            errno = status;
+            return INVALID_SOCKET;
+        }
+    } else {
+        /* pbm */
+        __xmlIOErr(XML_FROM_HTTP, 0, "select failed\n");
+        closesocket(s);
+        return INVALID_SOCKET;
+    }
+
+    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 SOCKET
+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;
+    SOCKET 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 INVALID_SOCKET;
+        }
+
+        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 INVALID_SOCKET;
+                }
+                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 INVALID_SOCKET;
+                }
+                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 != INVALID_SOCKET) {
+                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 (GETHOSTBYNAME_ARG_CAST 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;
+
+#ifdef NO_ADDRESS
+                case NO_ADDRESS:
+                    h_err_txt =
+                        "Valid name, no data record of requested type.";
+                    break;
+#endif
+
+                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 INVALID_SOCKET;
+        }
+
+        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 INVALID_SOCKET;
+                }
+                memcpy (&ia, h->h_addr_list[i], h->h_length);
+                sockin.sin_family = h->h_addrtype;
+                sockin.sin_addr = ia;
+                sockin.sin_port = (unsigned 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 INVALID_SOCKET;
+                }
+                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 != INVALID_SOCKET)
+                return (s);
+        }
+    }
+#endif
+
+#ifdef DEBUG_HTTP
+    xmlGenericError(xmlGenericErrorContext,
+                    "xmlNanoHTTPConnectHost:  unable to connect to '%s'.\n",
+                    host);
+#endif
+    return INVALID_SOCKET;
+}
+
+
+/**
+ * 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;
+        ctxt->strm->avail_in = ctxt->inptr - ctxt->inrptr;
+
+        while (ctxt->strm->avail_out > 0 &&
+               (ctxt->strm->avail_in > 0 || xmlNanoHTTPRecv(ctxt) > 0)) {
+            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;
+        }
+
+        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;
+    SOCKET ret;
+    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);
+        if (ctxt == NULL)
+            return(NULL);
+    } else {
+        ctxt = xmlNanoHTTPNewCtxt(redirURL);
+        if (ctxt == NULL)
+            return(NULL);
+        ctxt->location = xmlMemStrdup(redirURL);
+    }
+
+    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 == INVALID_SOCKET) {
+        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)
+        /* reserve for string plus 'Content-Type: \r\n" */
+        blen += strlen(*contentType) + 16;
+    if (ctxt->query != NULL)
+        /* 1 for '?' */
+        blen += strlen(ctxt->query) + 1;
+    blen += strlen(method) + strlen(ctxt->path) + 24;
+#ifdef HAVE_ZLIB_H
+    /* reserve for possible 'Accept-Encoding: gzip' string */
+    blen += 23;
+#endif
+    if (ctxt->port != 80) {
+        /* reserve space for ':xxxxx', incl. potential proxy */
+        if (proxy)
+            blen += 12;
+        else
+            blen += 6;
+    }
+    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);
+
+    if (ctxt->port == 80) {
+        p += snprintf( p, blen - (p - bp), " HTTP/1.0\r\nHost: %s\r\n",
+                    ctxt->hostname);
+    } else {
+        p += snprintf( p, blen - (p - bp), " HTTP/1.0\r\nHost: %s:%d\r\n",
+                    ctxt->hostname, ctxt->port);
+    }
+
+#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;
+
+    while ((p = xmlNanoHTTPReadLine(ctxt)) != NULL) {
+        if (*p == 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;
+    int ret = 0;
+
+    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 ) {
+        if (write(fd, buf, len) == -1) {
+            ret = -1;
+        }
+    }
+
+    xmlNanoHTTPClose(ctxt);
+    close(fd);
+    return(ret);
+}
+
+#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;
+    int ret = 0;
+
+    if ((ctxt == NULL) || (filename == NULL)) return(-1);
+
+    if (!strcmp(filename, "-"))
+        fd = 0;
+    else {
+        fd = open(filename, O_CREAT | O_WRONLY, 0666);
+        if (fd < 0) {
+            xmlNanoHTTPClose(ctxt);
+            return(-1);
+        }
+    }
+
+    xmlNanoHTTPFetchContent( ctxt, &buf, &len );
+    if ( len > 0 ) {
+        if (write(fd, buf, len) == -1) {
+            ret = -1;
+        }
+    }
+
+    xmlNanoHTTPClose(ctxt);
+    close(fd);
+    return(ret);
+}
+#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"