Annotation of libwww/Library/src/HTReader.c, revision 2.20
2.1 frystyk 1: /* HTReader.c
2: ** READ STREAM FROM THE NETWORK USING TCP
3: **
4: ** (c) COPYRIGHT MIT 1995.
5: ** Please first read the full copyright statement in the file COPYRIGH.
2.20 ! frystyk 6: ** @(#) $Id: HTReader.c,v 2.19 1997/12/16 21:09:26 frystyk Exp $
2.1 frystyk 7: **
8: ** HISTORY:
9: ** 6 June 95 HFN Written
10: */
11:
12: /* Library Include files */
13: #include "sysdep.h"
14: #include "WWWUtil.h"
2.5 frystyk 15: #include "WWWCore.h"
2.1 frystyk 16: #include "HTNetMan.h"
17: #include "HTReader.h" /* Implemented here */
18:
19: struct _HTStream {
20: const HTStreamClass * isa;
21: /* ... */
22: };
23:
24: struct _HTInputStream {
25: const HTInputStreamClass * isa;
26: HTChannel * ch;
2.9 frystyk 27: HTHost * host;
2.1 frystyk 28: char * write; /* Last byte written */
29: char * read; /* Last byte read */
2.15 frystyk 30: int b_read;
2.1 frystyk 31: char data [INPUT_BUFFER_SIZE]; /* buffer */
32: };
33:
34: /* ------------------------------------------------------------------------- */
35:
36: PRIVATE int HTReader_flush (HTInputStream * me)
37: {
2.9 frystyk 38: HTNet * net = HTHost_getReadNet(me->host);
39: return net && net->readStream ? (*net->readStream->isa->flush)(net->readStream) : HT_OK;
2.1 frystyk 40: }
41:
42: PRIVATE int HTReader_free (HTInputStream * me)
43: {
2.9 frystyk 44: HTNet * net = HTHost_getReadNet(me->host);
45: if (net && net->readStream) {
46: int status = (*net->readStream->isa->_free)(net->readStream);
2.19 frystyk 47: if (status == HT_OK) net->readStream = NULL;
2.1 frystyk 48: return status;
49: }
50: return HT_OK;
51: }
52:
53: PRIVATE int HTReader_abort (HTInputStream * me, HTList * e)
54: {
2.9 frystyk 55: HTNet * net = HTHost_getReadNet(me->host);
56: if (net && net->readStream) {
57: int status = (*net->readStream->isa->abort)(net->readStream, NULL);
58: if (status != HT_IGNORE) net->readStream = NULL;
2.1 frystyk 59: }
60: return HT_ERROR;
61: }
62:
63: /* Push data from a socket down a stream
64: ** -------------------------------------
65: **
66: ** This routine is responsible for creating and PRESENTING any
67: ** graphic (or other) objects described by the file. As this function
68: ** max reads a chunk of data on size INPUT_BUFFER_SIZE, it can be used
69: ** with both blocking or non-blocking sockets. It will always return to
70: ** the event loop, however if we are using blocking I/O then we get a full
71: ** buffer read, otherwise we get what's available.
72: **
73: ** Returns HT_LOADED if finished reading
74: ** HT_OK if OK, but more to read
75: ** HT_ERROR if error,
76: ** HT_WOULD_BLOCK if read or write would block
77: ** HT_PAUSE if stream is paused
78: */
2.13 eric 79: char * strnstr(char * haystack, int *pLen, char * needle)
80: {
81: int found = 0;
82: int need = strlen(needle);
83: int i, start;
84: for (start = i = 0; i < *pLen; i++)
85: if (haystack[i] == needle[found]) {
86: if (++found == need) {
87: i -= need - 1; /* beginning of string */
88: *pLen -= i;
89: return haystack+i;
90: }
91: } else {
92: found = 0;
93: }
94: *pLen = 0;
95: return NULL;
96: }
97:
2.20 ! frystyk 98: /* int DebugBufferSize = INPUT_BUFFER_SIZE; */
2.9 frystyk 99:
2.1 frystyk 100: PRIVATE int HTReader_read (HTInputStream * me)
101: {
2.9 frystyk 102: HTHost * host = me->host;
103: SOCKET soc = HTChannel_socket(me->ch);
104: HTNet * net = HTHost_getReadNet(host);
105: HTRequest * request = HTNet_request(net);
2.1 frystyk 106: int status;
2.19 frystyk 107: if (!net->readStream) {
108: if (PROT_TRACE) HTTrace("Read Socket. No read stream for net object %p\n", net);
109: return HT_ERROR;
110: }
111:
2.9 frystyk 112: /* me->b_read = me->read - me->data; */
2.1 frystyk 113: /* Read from socket if we got rid of all the data previously read */
114: do {
2.9 frystyk 115: /* don't read if we have to push unwritten data from last call */
2.1 frystyk 116: if (me->write >= me->read) {
2.20 ! frystyk 117: if ((me->b_read = NETREAD(soc, me->data, INPUT_BUFFER_SIZE)) < 0) {
2.1 frystyk 118: #ifdef EAGAIN
119: if (socerrno==EAGAIN || socerrno==EWOULDBLOCK) /* POSIX */
120: #else
121: if (socerrno==EWOULDBLOCK) /* BSD */
122: #endif
123: {
124: if (PROT_TRACE)
125: HTTrace("Read Socket. WOULD BLOCK fd %d\n",soc);
2.9 frystyk 126: HTHost_register(host, net, HTEvent_READ);
2.1 frystyk 127: return HT_WOULD_BLOCK;
128: #ifdef __svr4__
129: /*
130: ** In Solaris envirnoment, SIGPOLL is used to signal end of buffer for
131: ** /dev/audio. If your process is also doing a socket read, it will cause
132: ** an EINTR error. This error will cause the www library request to
133: ** terminate prematurly.
134: */
135: } else if (socerrno == EINTR) {
136: continue;
137: #endif /* __svr4__ */
2.9 frystyk 138: #ifdef EPIPE
139: } else if (socerrno == EPIPE) {
140: goto socketClosed;
141: #endif /* EPIPE */
2.1 frystyk 142: } else { /* We have a real error */
143:
144: /* HERE WE SHOULD RETURN target abort */
2.9 frystyk 145: if (request)
146: HTRequest_addSystemError(request, ERR_FATAL, socerrno,
147: NO, "NETREAD");
2.1 frystyk 148: return HT_ERROR;
149: }
2.8 frystyk 150: #ifdef ECONNRESET
2.9 frystyk 151: } else if (!me->b_read || socerrno==ECONNRESET) {
2.8 frystyk 152: #else
2.9 frystyk 153: } else if (!me->b_read) {
2.8 frystyk 154: #endif
2.9 frystyk 155: socketClosed:
2.11 frystyk 156: if (PROT_TRACE)
157: HTTrace("Read Socket. FIN received on socket %d\n", soc);
2.9 frystyk 158: if (request) {
159: HTAlertCallback *cbf = HTAlert_find(HT_PROG_DONE);
160: if (PROT_TRACE)
161: if (cbf) (*cbf)(request, HT_PROG_DONE,
162: HT_MSG_NULL, NULL, NULL, NULL);
163: }
164: HTHost_unregister(host, net, HTEvent_READ);
2.18 frystyk 165: HTHost_register(host, net, HTEvent_CLOSE);
2.1 frystyk 166: return HT_CLOSED;
167: }
168:
169: /* Remember how much we have read from the input socket */
2.17 frystyk 170: HTTraceData(me->data, me->b_read, "HTReader.... Reading");
2.1 frystyk 171: me->write = me->data;
2.9 frystyk 172: me->read = me->data + me->b_read;
2.13 eric 173: #ifdef FIND_SIGNATURES
174: {
175: char * ptr = me->data;
176: int len = me->b_read;
177: while ((ptr = strnstr(ptr, &len, "HTTP/1.1 200 OK")) != NULL) {
178: if (PROT_TRACE)
179: HTTrace("Read Socket. Signature found at 0x%x of 0x%x.\n", ptr - me->data, me->b_read);
180: ptr++;
181: len--;
182: }
183: }
184: #endif /* FIND_SIGNATURES */
2.1 frystyk 185: #ifdef NOT_ASCII
186: {
187: char *p = me->data;
188: while (p < me->read) {
189: *p = FROMASCII(*p);
190: p++;
191: }
192: }
193: #endif /* NOT_ASCII */
194:
2.19 frystyk 195: if (PROT_TRACE)
2.1 frystyk 196: HTTrace("Read Socket. %d bytes read from socket %d\n",
2.9 frystyk 197: me->b_read, soc);
198: if (request) {
2.1 frystyk 199: HTAlertCallback * cbf = HTAlert_find(HT_PROG_READ);
2.9 frystyk 200: #if 0
201: /* byte account is done later */
202: net->bytesRead += me->b_read;
203: #endif
204: if (cbf) (*cbf)(request, HT_PROG_READ,
2.1 frystyk 205: HT_MSG_NULL, NULL, NULL, NULL);
206: }
207: }
208:
209: /* Now push the data down the stream */
2.9 frystyk 210: if ((status = (*net->readStream->isa->put_block)
211: (net->readStream, me->write, me->b_read)) != HT_OK) {
2.1 frystyk 212: if (status == HT_WOULD_BLOCK) {
213: if (PROT_TRACE) HTTrace("Read Socket. Target WOULD BLOCK\n");
2.9 frystyk 214: HTHost_unregister(host, net, HTEvent_READ);
2.1 frystyk 215: return HT_WOULD_BLOCK;
216: } else if (status == HT_PAUSE) {
217: if (PROT_TRACE) HTTrace("Read Socket. Target PAUSED\n");
2.9 frystyk 218: HTHost_unregister(host, net, HTEvent_READ);
2.1 frystyk 219: return HT_PAUSE;
2.9 frystyk 220: /* CONTINUE code or stream code means data was consumed */
221: } else if (status == HT_CONTINUE || status > 0) {
222: if (status == HT_CONTINUE) {
223: if (PROT_TRACE) HTTrace("Read Socket. CONTINUE\n");
224: } else
225: if (PROT_TRACE)
226: HTTrace("Read Socket. Target returns %d\n", status);
227: /* me->write = me->read; */
2.1 frystyk 228: return status;
229: } else { /* We have a real error */
230: if (PROT_TRACE) HTTrace("Read Socket. Target ERROR\n");
231: return status;
232: }
233: }
2.9 frystyk 234: me->write = me->read;
2.19 frystyk 235: {
236: int remaining = HTHost_remainingRead(host);
237: if (remaining > 0) {
2.20 ! frystyk 238: HTTrace("Read Socket. DIDN'T CONSUME %d BYTES: `%s\'\n",
! 239: remaining, me->read);
2.19 frystyk 240: HTHost_setConsumed(host, remaining);
241: }
242: }
2.1 frystyk 243: } while (net->preemptive);
2.9 frystyk 244: HTHost_register(host, net, HTEvent_READ);
2.1 frystyk 245: return HT_WOULD_BLOCK;
246: }
247:
248: /*
249: ** The difference between the close and the free method is that we don't
250: ** close the connection in the free method - we only call the free method
251: ** of the target stream. That way, we can keep the input stream as long
252: ** as the channel itself.
253: */
254: PRIVATE int HTReader_close (HTInputStream * me)
255: {
256: int status = HT_OK;
2.9 frystyk 257: HTNet * net = HTHost_getReadNet(me->host);
258: if (net && net->readStream) {
259: if ((status = (*net->readStream->isa->_free)(net->readStream))==HT_WOULD_BLOCK)
2.1 frystyk 260: return HT_WOULD_BLOCK;
2.9 frystyk 261: net->readStream = NULL;
2.1 frystyk 262: }
263: if (PROT_TRACE) HTTrace("Socket read. FREEING....\n");
264: HT_FREE(me);
265: return status;
266: }
267:
2.9 frystyk 268: PUBLIC int HTReader_consumed (HTInputStream * me, size_t bytes)
269: {
270: me->write += bytes;
271: me->b_read -= bytes;
272: HTHost_setRemainingRead(me->host, me->b_read);
273: return HT_OK;
274: }
275:
2.1 frystyk 276: PRIVATE const HTInputStreamClass HTReader =
277: {
278: "SocketReader",
279: HTReader_flush,
280: HTReader_free,
281: HTReader_abort,
282: HTReader_read,
2.9 frystyk 283: HTReader_close,
284: HTReader_consumed
2.1 frystyk 285: };
286:
287: /*
288: ** Create a new input read stream. Before we actually create it we check
289: ** to see whether we already have an input stream for this channel and if
290: ** so we just return that. This means that we can reuse input streams
291: ** in persistent connections, for example.
292: */
2.9 frystyk 293: PUBLIC HTInputStream * HTReader_new (HTHost * host, HTChannel * ch,
294: void * param, int mode)
2.1 frystyk 295: {
2.9 frystyk 296: if (host && ch) {
2.1 frystyk 297: HTInputStream * me = HTChannel_input(ch);
298: if (me == NULL) {
299: if ((me=(HTInputStream *) HT_CALLOC(1, sizeof(HTInputStream))) == NULL)
300: HT_OUTOFMEM("HTReader_new");
301: me->isa = &HTReader;
302: me->ch = ch;
2.9 frystyk 303: me->host = host;
2.1 frystyk 304: }
305: return me;
306: }
307: return NULL;
308: }
2.9 frystyk 309:
Webmaster
![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to HTReader.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Public] / libwww / Library / src