trunk/Search/HttpHandler.cpp

/* ============================================================================
 * Douglas Thrift's Search Engine License
 *
 * Copyright (C) 2002-2003, Douglas Thrift. All Rights Reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. The end-user documentation included with the redistribution, if any, must
 *    include the following acknowledgment:
 *
 *       "This product includes software developed by Douglas Thrift
 *       (http://computers.douglasthrift.net/searchengine/)."
 *
 *    Alternately, this acknowledgment may appear in the software itself, if
 *    and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Douglas Thrift" and "Douglas Thrift's Search Engine" must not
 *    be used to endorse or promote products derived from this software without
 *    specific prior written permission.  For written permission, please visit
 *    http://www.douglasthrift.net/contact.cgi for contact information.
 *
 * 5. Products derived from this software may not be called "Douglas Thrift's
 *    Search Engine", nor may "Douglas Thrift's Search Engine" appear in their
 *    name, without prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * ============================================================================
 */
// Douglas Thrift's Search Engine HTTP Handler
//
// Douglas Thrift
//
// HttpHandler.cpp

#include "HttpHandler.h"

HttpHandler::HttpHandler()
{
        buffer = new char[BUFSIZ + 1];

#ifdef _WIN32
        if (WSAStartup(MAKEWORD(2, 0), &data) != 0)
        {
                error(program + ": WSAStartup");
                exit(1);
        }
#endif // _WIN32

        length = 0;
        chunked = false;
}

HttpHandler::~HttpHandler()
{
        delete [] buffer;

#ifdef _WIN32
        WSACleanup();
#endif // _WIN32
}

bool HttpHandler::handle(URL &url, const string referer, bool head)
{
        bool answer = false;

        if ((http = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
        {
                error(program + ": Socket");
                exit(1);
        }

        sockaddr_in address;
        hostent* host;

        address.sin_family = AF_INET;

        if ((host = gethostbyname(url.getAddress().c_str())) == NULL)
        {
                error(program + ": Host: " + url.getAddress(), true);
                return answer;
        }

        address.sin_addr = *((in_addr*)*host->h_addr_list);
        address.sin_port = htons(url.getPort());

        if (connect(http, (sockaddr*)&address, sizeof(sockaddr_in)) ==
                SOCKET_ERROR)
        {
                error(program + ": Connect");
                return answer;
        }

        if (head)
        {
                putline("HEAD " + url.getPath() + " HTTP/1.1");
        }
        else
        {
                putline("GET " + url.getPath() + " HTTP/1.1");
        }

        putline("Accept: text/html; text/plain");
        putline("User-Agent: " + agent(true) + ' ' + platform());

        if (url.getPort() == 80)
        {
                putline("Host: " + url.getAddress());
        }
        else
        {
                char* port = new char[1024];
                sprintf(port, "%u", url.getPort());

                putline("Host: " + url.getAddress() + ':' + port);

                delete [] port;
        }

        if (referer != "")
        {
                putline("Referer: " + referer);
        }

        putline("Connection: close");
        putline();

        code response;
        string line;

        do
        {
                line = getline();

                if (line.find("HTTP/") != 0)
                {
                        return answer;
                }

                unsigned dot = line.find('.');
                unsigned space = line.find(' ');

                unsigned major = strtoul(line.substr(5, dot - 5).c_str(), 0, 10);
                unsigned minor = strtoul(line.substr(dot + 1, space - dot - 1).c_str(),
                        0, 10);

                if (major > 1)
                {
                        cerr << program << ": Potentially Incompatible Server: HTTP/" <<
                                major << "." << minor << "\n";

                        return answer;
                }

                response = code(strtoul(line.substr(space + 1).c_str(), 0, 10));

                if (response < ok) do line = getline(); while (line != "");
        }
        while (response < ok);

        do
        {
                line = getline();

                if (line != "")
                {
                        unsigned colon = line.find(':');

                        string field = line.substr(0, colon);
                        string value = line.substr(colon + 1);

                        while (isspace(value[0])) value.erase(0, 1);

                        if (field == "Content-Type")
                        {
                                type = value;
                        }
                        else if (field == "Content-Length")
                        {
                                length = strtoul(value.c_str(), 0, 10);
                        }
                        else if (field == "Location")
                        {
                                location = value;
                        }
                        else if (field == "Transfer-Encoding")
                        {
                                chunked = value == "chunked";
                        }
                }
        }
        while (line != "");

        switch (response)
        {
        case ok:
                if (debug) cerr << "response = " << response << "\n";
                answer = true;
                break;
        case choices:
        case moved:
        case found:
                if (debug) cerr << "response = " << response << "\n"
                        << "location = " << location << "\n";
                location = getLink(location, url);
                break;
        case notfound:
        case internal:
                if (debug) cerr << "response = " << response << "\n";
                break;
        default:
                if (debug) cerr << "response = " << response << "\n";
                if (response <= 299)
                {
                        answer = true;
                }
                else if (response <= 399)
                {
                        location = getLink(location, url);
                }
                break;
        }

        if (!head && answer) populate();

        return answer;
}

HttpHandler& HttpHandler::getline(string& line, char endline)
{
        unsigned end = page.find(endline);
        unsigned newline = page.find('\n');

        if (newline < end || end == string::npos)
        {
                end = newline;
        }

        line = page.substr(0, end);
        page.erase(0, (end == string::npos ? end : end + 1));

        return *this;
}

void HttpHandler::clear()
{
        closesocket(http);

        type = "";
        length = 0;
        location = "";
        page = "";
        chunked = false;
}

void HttpHandler::populate()
{
        if (!chunked)
        {
                unsigned left = length;

                while (left > 0)
                {
                        memset(buffer, 0, BUFSIZ + 1);

                        unsigned bytes = left > BUFSIZ ? BUFSIZ : left;
                        unsigned received;

                        while (true)
                        {
                                if ((received = recv(http, buffer, bytes, 0)) == SOCKET_ERROR)
                                {
                                        error(program + ": Recv");
                                        exit(1);
                                }
                                else if (received != bytes)
                                {
                                        left -= received;
                                        page += buffer;

                                        memset(buffer, 0, BUFSIZ + 1);

                                        bytes -= received;
                                }
                                else
                                {
                                        break;
                                }
                        }

                        page += buffer;
                        left -= bytes;
                }
        }
        else
        {
                unsigned chunk;

                do
                {
                        chunk = strtoul(getline().c_str(), 0, 16);

                        unsigned left = chunk;

                        while (left > 0)
                        {
                                memset(buffer, 0, BUFSIZ + 1);

                                unsigned bytes = left > BUFSIZ ? BUFSIZ : left;
                                unsigned received;

                                while (true)
                                {
                                        if ((received = recv(http, buffer, bytes, 0)) ==
                                                SOCKET_ERROR)
                                        {
                                                error(program + ": Recv");
                                                exit(1);
                                        }
                                        else if (received != bytes)
                                        {
                                                left -= received;
                                                page += buffer;

                                                memset(buffer, 0, BUFSIZ + 1);

                                                bytes -= received;
                                        }
                                        else
                                        {
                                                break;
                                        }
                                }

                                page += buffer;
                                left -= bytes;
                        }

                        getline();
                        length += chunk;
                }
                while (chunk > 0);
        }

        for (unsigned index = 0; index < page.length(); index++)
        {
                if (page[index] == '\r' && (index + 1 < page.length()) ? page[index +
                        1] == '\n' : false)
                {
                        page.erase(index, 1);
                }
                else if (page[index] == '\r')
                {
                        page[index] = '\n';
                }
        }
}

void HttpHandler::putline(const string line)
{
        sprintf(buffer, "%s\r\n", line.c_str());
        if (send(http, buffer, strlen(buffer), 0) == SOCKET_ERROR)
        {
                error(program + ": Send");
                exit(1);
        }
}

string HttpHandler::getline()
{
        string line;
        char byte;

        do
        {
                if (recv(http, &byte, 1, 0) == SOCKET_ERROR)
                {
                        error(program + ": Recv");
                }

                if (byte != '\r' && byte != '\n')
                {
                        line += byte;
                }
        }
        while (byte != '\n');

        return line;
}

void HttpHandler::error(const string& prefix, bool host)
{
#ifdef _WIN32
        string error;

        switch (WSAGetLastError())
        {
        case WSAEACCES:
                error = "Permission denied.";
                break;
        case WSAEADDRINUSE:
                error = "Address already in use.";
                break;
        case WSAEADDRNOTAVAIL:
                error = "Cannot assign requested address.";
                break;
        case WSAEAFNOSUPPORT:
                error = "Address family not supported by protocol family.";
                break;
        case WSAEALREADY:
                error = "Operation already in progress.";
                break;
        case WSAECONNABORTED:
                error = "Software caused connection abort.";
                break;
        case WSAECONNREFUSED:
                error = "Connection refused.";
                break;
        case WSAECONNRESET:
                error = "Connection reset by peer.";
                break;
        case WSAEDESTADDRREQ:
                error = "Destination address required.";
                break;
        case WSAEFAULT:
                error = "Bad address.";
                break;
        case WSAEHOSTDOWN:
                error = "Host is down.";
                break;
        case WSAEHOSTUNREACH:
                error = "No route to host.";
                break;
        case WSAEINPROGRESS:
                error = "Operation now in progress.";
                break;
        case WSAEINTR:
                error = "Interrupted function call.";
                break;
        case WSAEINVAL:
                error = "Invalid argument.";
                break;
        case WSAEISCONN:
                error = "Socket is already connected.";
                break;
        case WSAEMFILE:
                error = "Too many open files.";
                break;
        case WSAEMSGSIZE:
                error = "Message too long.";
                break;
        case WSAENETDOWN:
                error = "Network is down.";
                break;
        case WSAENETRESET:
                error = "Network dropped connection on reset.";
                break;
        case WSAENETUNREACH:
                error = "Network is unreachable.";
                break;
        case WSAENOBUFS:
                error = "No buffer space available.";
                break;
        case WSAENOPROTOOPT:
                error = "Bad protocol option.";
                break;
        case WSAENOTCONN:
                error = "Socket is not connected.";
                break;
        case WSAENOTSOCK:
                error = "Socket operation on non-socket.";
                break;
        case WSAEOPNOTSUPP:
                error = "Operation not supported.";
                break;
        case WSAEPFNOSUPPORT:
                error = "Protocol family not supported.";
                break;
        case WSAEPROCLIM:
                error = "Too many processes.";
                break;
        case WSAEPROTONOSUPPORT:
                error = "Protocol not supported.";
                break;
        case WSAEPROTOTYPE:
                error = "Protocol wrong type for socket.";
                break;
        case WSAESHUTDOWN:
                error = "Cannot send after socket shutdown.";
                break;
        case WSAESOCKTNOSUPPORT:
                error = "Socket type not supported.";
                break;
        case WSAETIMEDOUT:
                error = "Connection timed out.";
                break;
        case WSATYPE_NOT_FOUND:
                error = "Class type not found.";
                break;
        case WSAEWOULDBLOCK:
                error = "Resource temporarily unavailable.";
                break;
        case WSAHOST_NOT_FOUND:
                error = "Host not found.";
                break;
        case WSA_INVALID_HANDLE:
                error = "Specified event object handle is invalid.";
                break;
        case WSA_INVALID_PARAMETER:
                error = "One or more parameters are invalid.";
                break;
//      case WSAINVALIDPROCTABLE:
//              error = "Invalid procedure table from service provider.";
//              break;
//      case WSAINVALIDPROVIDER:
//              error = "Invalid service provider version number.";
//              break;
        case WSA_IO_INCOMPLETE:
                error = "Overlapped I/O event object not in signaled state.";
                break;
        case WSA_IO_PENDING:
                error = "Overlapped operations will complete later.";
                break;
        case WSA_NOT_ENOUGH_MEMORY:
                error = "Insufficient memory available.";
                break;
        case WSANOTINITIALISED:
                error = "Successful WSAStartup not yet performed.";
                break;
        case WSANO_DATA:
                error = "Valid name, no data record of requested type.";
                break;
        case WSANO_RECOVERY:
                error = "This is a non-recoverable error.";
                break;
//      case WSAPROVIDERFAILEDINIT:
//              error = "Unable to initialize a service provider.";
//              break;
        case WSASYSCALLFAILURE:
                error = "System call failure.";
                break;
        case WSASYSNOTREADY:
                error = "Network subsystem is unavailable.";
                break;
        case WSATRY_AGAIN:
                error = "Non-authoritative host not found.";
                break;
        case WSAVERNOTSUPPORTED:
                error = "WINSOCK.DLL version out of range.";
                break;
        case WSAEDISCON:
                error = "Graceful shutdown in progress.";
                break;
        case WSA_OPERATION_ABORTED:
                error = "Overlapped operation aborted.";
                break;
        default:
                error = "Unknown error.";
                break;
        }

        cerr << prefix << ": " << error << "\n";
#else
        if (host)
        {
                herror(prefix.c_str());
        }
        else
        {
                perror(prefix.c_str());
        }
#endif // _WIN32
}
Revision:	145
Committed:	2003-05-31T14:31:50-07:00 (22 years ago) by douglas
File size:	12645 byte(s)
Log Message:	Found and fixed bug in HttpHandler::populate().
#	User	Rev	Content
1	douglas	1	/* ============================================================================
2			* Douglas Thrift's Search Engine License
3			*
4	douglas	28	* Copyright (C) 2002-2003, Douglas Thrift. All Rights Reserved.
5	douglas	1	* Redistribution and use in source and binary forms, with or without
6			* modification, are permitted provided that the following conditions are met:
7			*
8			* 1. Redistributions of source code must retain the above copyright notice,
9			* this list of conditions and the following disclaimer.
10			*
11			* 2. Redistributions in binary form must reproduce the above copyright notice,
12			* this list of conditions and the following disclaimer in the documentation
13			* and/or other materials provided with the distribution.
14			*
15			* 3. The end-user documentation included with the redistribution, if any, must
16			* include the following acknowledgment:
17			*
18			* "This product includes software developed by Douglas Thrift
19			* (http://computers.douglasthrift.net/searchengine/)."
20			*
21			* Alternately, this acknowledgment may appear in the software itself, if
22			* and wherever such third-party acknowledgments normally appear.
23			*
24			* 4. The names "Douglas Thrift" and "Douglas Thrift's Search Engine" must not
25			* be used to endorse or promote products derived from this software without
26			* specific prior written permission. For written permission, please visit
27			* http://www.douglasthrift.net/contact.cgi for contact information.
28			*
29			* 5. Products derived from this software may not be called "Douglas Thrift's
30			* Search Engine", nor may "Douglas Thrift's Search Engine" appear in their
31			* name, without prior written permission.
32			*
33			* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
34			* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
35			* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
36			* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
37			* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
38			* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
39			* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
40			* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
41			* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
42			* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
43			* ============================================================================
44			*/
45			// Douglas Thrift's Search Engine HTTP Handler
46			//
47			// Douglas Thrift
48			//
49			// HttpHandler.cpp
50
51			#include "HttpHandler.h"
52
53			HttpHandler::HttpHandler()
54			{
55	douglas	14	buffer = new char[BUFSIZ + 1];
56
57	douglas	13	#ifdef _WIN32
58	douglas	14	if (WSAStartup(MAKEWORD(2, 0), &data) != 0)
59	douglas	13	{
60	douglas	17	error(program + ": WSAStartup");
61	douglas	13	exit(1);
62			}
63			#endif // _WIN32
64	douglas	1
65	douglas	18	length = 0;
66			chunked = false;
67	douglas	1	}
68
69			HttpHandler::~HttpHandler()
70			{
71	douglas	14	delete [] buffer;
72
73	douglas	13	#ifdef _WIN32
74			WSACleanup();
75			#endif // _WIN32
76	douglas	1	}
77
78	douglas	25	bool HttpHandler::handle(URL &url, const string referer, bool head)
79	douglas	1	{
80			bool answer = false;
81
82	douglas	14	if ((http = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
83			{
84			error(program + ": Socket");
85			exit(1);
86			}
87	douglas	1
88	douglas	14	sockaddr_in address;
89			hostent* host;
90	douglas	1
91	douglas	14	address.sin_family = AF_INET;
92	douglas	1
93	douglas	14	if ((host = gethostbyname(url.getAddress().c_str())) == NULL)
94			{
95			error(program + ": Host: " + url.getAddress(), true);
96			return answer;
97			}
98	douglas	1
99	douglas	14	address.sin_addr = ((in_addr)*host->h_addr_list);
100			address.sin_port = htons(url.getPort());
101
102			if (connect(http, (sockaddr*)&address, sizeof(sockaddr_in)) ==
103			SOCKET_ERROR)
104			{
105			error(program + ": Connect");
106			return answer;
107			}
108
109			if (head)
110			{
111			putline("HEAD " + url.getPath() + " HTTP/1.1");
112			}
113			else
114			{
115			putline("GET " + url.getPath() + " HTTP/1.1");
116			}
117
118			putline("Accept: text/html; text/plain");
119			putline("User-Agent: " + agent(true) + ' ' + platform());
120
121			if (url.getPort() == 80)
122			{
123			putline("Host: " + url.getAddress());
124			}
125			else
126			{
127			char* port = new char[1024];
128			sprintf(port, "%u", url.getPort());
129
130			putline("Host: " + url.getAddress() + ':' + port);
131
132			delete [] port;
133			}
134
135	douglas	25	if (referer != "")
136			{
137			putline("Referer: " + referer);
138			}
139
140	douglas	18	putline("Connection: close");
141	douglas	14	putline();
142
143	douglas	18	code response;
144			string line;
145	douglas	17
146	douglas	18	do
147	douglas	17	{
148	douglas	18	line = getline();
149	douglas	17
150	douglas	18	if (line.find("HTTP/") != 0)
151			{
152			return answer;
153			}
154	douglas	17
155	douglas	18	unsigned dot = line.find('.');
156			unsigned space = line.find(' ');
157	douglas	17
158	douglas	19	unsigned major = strtoul(line.substr(5, dot - 5).c_str(), 0, 10);
159			unsigned minor = strtoul(line.substr(dot + 1, space - dot - 1).c_str(),
160			0, 10);
161	douglas	17
162	douglas	24	if (major > 1)
163	douglas	18	{
164	douglas	19	cerr << program << ": Potentially Incompatible Server: HTTP/" <<
165			major << "." << minor << "\n";
166	douglas	18
167			return answer;
168			}
169
170	douglas	19	response = code(strtoul(line.substr(space + 1).c_str(), 0, 10));
171	douglas	18
172			if (response < ok) do line = getline(); while (line != "");
173	douglas	17	}
174	douglas	18	while (response < ok);
175	douglas	17
176			do
177			{
178			line = getline();
179	douglas	18
180			if (line != "")
181			{
182			unsigned colon = line.find(':');
183
184			string field = line.substr(0, colon);
185			string value = line.substr(colon + 1);
186
187			while (isspace(value[0])) value.erase(0, 1);
188
189	douglas	19	if (field == "Content-Type")
190			{
191			type = value;
192			}
193			else if (field == "Content-Length")
194			{
195			length = strtoul(value.c_str(), 0, 10);
196			}
197			else if (field == "Location")
198			{
199			location = value;
200			}
201			else if (field == "Transfer-Encoding")
202			{
203			chunked = value == "chunked";
204			}
205	douglas	18	}
206	douglas	17	}
207			while (line != "");
208
209			switch (response)
210			{
211			case ok:
212	douglas	18	if (debug) cerr << "response = " << response << "\n";
213	douglas	17	answer = true;
214			break;
215	douglas	18	case choices:
216	douglas	17	case moved:
217			case found:
218	douglas	18	if (debug) cerr << "response = " << response << "\n"
219			<< "location = " << location << "\n";
220			location = getLink(location, url);
221	douglas	17	break;
222			case notfound:
223			case internal:
224	douglas	18	if (debug) cerr << "response = " << response << "\n";
225	douglas	17	break;
226			default:
227	douglas	18	if (debug) cerr << "response = " << response << "\n";
228			if (response <= 299)
229			{
230			answer = true;
231			}
232			else if (response <= 399)
233			{
234			location = getLink(location, url);
235			}
236	douglas	17	break;
237			}
238
239	douglas	19	if (!head && answer) populate();
240
241	douglas	1	return answer;
242			}
243
244			HttpHandler& HttpHandler::getline(string& line, char endline)
245			{
246	douglas	21	unsigned end = page.find(endline);
247			unsigned newline = page.find('\n');
248	douglas	1
249			if (newline < end \|\| end == string::npos)
250			{
251			end = newline;
252			}
253
254	douglas	20	line = page.substr(0, end);
255			page.erase(0, (end == string::npos ? end : end + 1));
256	douglas	1
257			return *this;
258			}
259
260			void HttpHandler::clear()
261			{
262	douglas	18	closesocket(http);
263
264	douglas	17	type = "";
265			length = 0;
266			location = "";
267	douglas	1	page = "";
268	douglas	18	chunked = false;
269	douglas	1	}
270
271	douglas	19	void HttpHandler::populate()
272			{
273			if (!chunked)
274			{
275			unsigned left = length;
276
277			while (left > 0)
278			{
279			memset(buffer, 0, BUFSIZ + 1);
280
281			unsigned bytes = left > BUFSIZ ? BUFSIZ : left;
282	douglas	24	unsigned received;
283	douglas	19
284	douglas	145	while (true)
285	douglas	19	{
286	douglas	145	if ((received = recv(http, buffer, bytes, 0)) == SOCKET_ERROR)
287	douglas	24	{
288			error(program + ": Recv");
289			exit(1);
290			}
291	douglas	145	else if (received != bytes)
292			{
293			left -= received;
294			page += buffer;
295
296			memset(buffer, 0, BUFSIZ + 1);
297
298			bytes -= received;
299			}
300			else
301			{
302			break;
303			}
304	douglas	24	}
305
306	douglas	19	page += buffer;
307			left -= bytes;
308			}
309			}
310			else
311			{
312	douglas	20	unsigned chunk;
313
314			do
315			{
316			chunk = strtoul(getline().c_str(), 0, 16);
317
318			unsigned left = chunk;
319
320			while (left > 0)
321			{
322			memset(buffer, 0, BUFSIZ + 1);
323
324			unsigned bytes = left > BUFSIZ ? BUFSIZ : left;
325	douglas	24	unsigned received;
326	douglas	20
327	douglas	145	while (true)
328	douglas	20	{
329	douglas	145	if ((received = recv(http, buffer, bytes, 0)) ==
330			SOCKET_ERROR)
331	douglas	24	{
332			error(program + ": Recv");
333			exit(1);
334			}
335	douglas	145	else if (received != bytes)
336			{
337			left -= received;
338			page += buffer;
339
340			memset(buffer, 0, BUFSIZ + 1);
341
342			bytes -= received;
343			}
344			else
345			{
346			break;
347			}
348	douglas	24	}
349
350	douglas	20	page += buffer;
351			left -= bytes;
352			}
353
354			getline();
355			length += chunk;
356			}
357			while (chunk > 0);
358	douglas	19	}
359
360	douglas	20	for (unsigned index = 0; index < page.length(); index++)
361			{
362			if (page[index] == '\r' && (index + 1 < page.length()) ? page[index +
363			1] == '\n' : false)
364			{
365			page.erase(index, 1);
366			}
367			else if (page[index] == '\r')
368			{
369			page[index] = '\n';
370			}
371			}
372	douglas	19	}
373
374	douglas	14	void HttpHandler::putline(const string line)
375			{
376			sprintf(buffer, "%s\r\n", line.c_str());
377			if (send(http, buffer, strlen(buffer), 0) == SOCKET_ERROR)
378			{
379			error(program + ": Send");
380			exit(1);
381			}
382			}
383
384	douglas	17	string HttpHandler::getline()
385			{
386			string line;
387			char byte;
388
389			do
390			{
391			if (recv(http, &byte, 1, 0) == SOCKET_ERROR)
392			{
393			error(program + ": Recv");
394			}
395
396			if (byte != '\r' && byte != '\n')
397			{
398			line += byte;
399			}
400			}
401			while (byte != '\n');
402
403			return line;
404			}
405
406	douglas	18	void HttpHandler::error(const string& prefix, bool host)
407	douglas	1	{
408	douglas	13	#ifdef _WIN32
409			string error;
410	douglas	1
411	douglas	13	switch (WSAGetLastError())
412	douglas	1	{
413	douglas	13	case WSAEACCES:
414			error = "Permission denied.";
415			break;
416			case WSAEADDRINUSE:
417			error = "Address already in use.";
418			break;
419			case WSAEADDRNOTAVAIL:
420			error = "Cannot assign requested address.";
421			break;
422			case WSAEAFNOSUPPORT:
423			error = "Address family not supported by protocol family.";
424			break;
425			case WSAEALREADY:
426			error = "Operation already in progress.";
427			break;
428			case WSAECONNABORTED:
429			error = "Software caused connection abort.";
430			break;
431			case WSAECONNREFUSED:
432			error = "Connection refused.";
433			break;
434			case WSAECONNRESET:
435			error = "Connection reset by peer.";
436			break;
437			case WSAEDESTADDRREQ:
438			error = "Destination address required.";
439			break;
440			case WSAEFAULT:
441			error = "Bad address.";
442			break;
443			case WSAEHOSTDOWN:
444			error = "Host is down.";
445			break;
446			case WSAEHOSTUNREACH:
447			error = "No route to host.";
448			break;
449			case WSAEINPROGRESS:
450			error = "Operation now in progress.";
451			break;
452			case WSAEINTR:
453			error = "Interrupted function call.";
454			break;
455			case WSAEINVAL:
456			error = "Invalid argument.";
457			break;
458			case WSAEISCONN:
459			error = "Socket is already connected.";
460			break;
461			case WSAEMFILE:
462			error = "Too many open files.";
463			break;
464			case WSAEMSGSIZE:
465			error = "Message too long.";
466			break;
467			case WSAENETDOWN:
468			error = "Network is down.";
469			break;
470			case WSAENETRESET:
471			error = "Network dropped connection on reset.";
472			break;
473			case WSAENETUNREACH:
474			error = "Network is unreachable.";
475			break;
476			case WSAENOBUFS:
477			error = "No buffer space available.";
478			break;
479			case WSAENOPROTOOPT:
480			error = "Bad protocol option.";
481			break;
482			case WSAENOTCONN:
483			error = "Socket is not connected.";
484			break;
485			case WSAENOTSOCK:
486			error = "Socket operation on non-socket.";
487			break;
488			case WSAEOPNOTSUPP:
489			error = "Operation not supported.";
490			break;
491			case WSAEPFNOSUPPORT:
492			error = "Protocol family not supported.";
493			break;
494			case WSAEPROCLIM:
495			error = "Too many processes.";
496			break;
497			case WSAEPROTONOSUPPORT:
498			error = "Protocol not supported.";
499			break;
500			case WSAEPROTOTYPE:
501			error = "Protocol wrong type for socket.";
502			break;
503			case WSAESHUTDOWN:
504			error = "Cannot send after socket shutdown.";
505			break;
506			case WSAESOCKTNOSUPPORT:
507			error = "Socket type not supported.";
508			break;
509			case WSAETIMEDOUT:
510			error = "Connection timed out.";
511			break;
512			case WSATYPE_NOT_FOUND:
513			error = "Class type not found.";
514			break;
515			case WSAEWOULDBLOCK:
516			error = "Resource temporarily unavailable.";
517			break;
518			case WSAHOST_NOT_FOUND:
519			error = "Host not found.";
520			break;
521			case WSA_INVALID_HANDLE:
522			error = "Specified event object handle is invalid.";
523			break;
524			case WSA_INVALID_PARAMETER:
525			error = "One or more parameters are invalid.";
526			break;
527			// case WSAINVALIDPROCTABLE:
528			// error = "Invalid procedure table from service provider.";
529			// break;
530			// case WSAINVALIDPROVIDER:
531			// error = "Invalid service provider version number.";
532			// break;
533			case WSA_IO_INCOMPLETE:
534			error = "Overlapped I/O event object not in signaled state.";
535			break;
536			case WSA_IO_PENDING:
537			error = "Overlapped operations will complete later.";
538			break;
539			case WSA_NOT_ENOUGH_MEMORY:
540			error = "Insufficient memory available.";
541			break;
542			case WSANOTINITIALISED:
543			error = "Successful WSAStartup not yet performed.";
544			break;
545			case WSANO_DATA:
546			error = "Valid name, no data record of requested type.";
547			break;
548			case WSANO_RECOVERY:
549			error = "This is a non-recoverable error.";
550			break;
551			// case WSAPROVIDERFAILEDINIT:
552			// error = "Unable to initialize a service provider.";
553			// break;
554			case WSASYSCALLFAILURE:
555			error = "System call failure.";
556			break;
557			case WSASYSNOTREADY:
558			error = "Network subsystem is unavailable.";
559			break;
560			case WSATRY_AGAIN:
561			error = "Non-authoritative host not found.";
562			break;
563			case WSAVERNOTSUPPORTED:
564			error = "WINSOCK.DLL version out of range.";
565			break;
566			case WSAEDISCON:
567			error = "Graceful shutdown in progress.";
568			break;
569			case WSA_OPERATION_ABORTED:
570			error = "Overlapped operation aborted.";
571			break;
572			default:
573			error = "Unknown error.";
574			break;
575			}
576	douglas	1
577	douglas	13	cerr << prefix << ": " << error << "\n";
578			#else
579			if (host)
580			{
581			herror(prefix.c_str());
582	douglas	1	}
583			else
584			{
585	douglas	13	perror(prefix.c_str());
586	douglas	1	}
587	douglas	13	#endif // _WIN32
588			}