Annotation of libwww/Library/src/HTReader.c, revision 2.15
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.
2.15 ! frystyk 6: ** @(#) $Id: HTReader.c,v 2.14 1996/12/18 17:58:20 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"
2.9 frystyk 16: #include "HTHost.h"
2.1 frystyk 17: #include "HTNetMan.h"
18: #include "HTReader.h" /* Implemented here */
19:
20: struct _HTStream {
21: const HTStreamClass * isa;
22: /* ... */
23: };
24:
25: struct _HTInputStream {
26: const HTInputStreamClass * isa;
27: HTChannel * ch;
2.9 frystyk 28: HTHost * host;
2.1 frystyk 29: char * write; /* Last byte written */
30: char * read; /* Last byte read */
2.15 ! frystyk 31: int b_read;
2.1 frystyk 32: char data [INPUT_BUFFER_SIZE]; /* buffer */
33: };
34:
35: /* ------------------------------------------------------------------------- */
36:
37: PRIVATE int HTReader_flush (HTInputStream * me)
38: {
2.9 frystyk 39: HTNet * net = HTHost_getReadNet(me->host);
40: return net && net->readStream ? (*net->readStream->isa->flush)(net->readStream) : HT_OK;
2.1 frystyk 41: }
42:
43: PRIVATE int HTReader_free (HTInputStream * me)
44: {
2.9 frystyk 45: HTNet * net = HTHost_getReadNet(me->host);
46: if (net && net->readStream) {
47: int status = (*net->readStream->isa->_free)(net->readStream);
48: if (status == HT_OK) net->readStream = NULL;
2.1 frystyk 49: return status;
50: }
51: return HT_OK;
52: }
53:
54: PRIVATE int HTReader_abort (HTInputStream * me, HTList * e)
55: {
2.9 frystyk 56: HTNet * net = HTHost_getReadNet(me->host);
57: if (net && net->readStream) {
58: int status = (*net->readStream->isa->abort)(net->readStream, NULL);
59: if (status != HT_IGNORE) net->readStream = NULL;
2.1 frystyk 60: }
61: return HT_ERROR;
62: }
63:
64: /* Push data from a socket down a stream
65: ** -------------------------------------
66: **
67: ** This routine is responsible for creating and PRESENTING any
68: ** graphic (or other) objects described by the file. As this function
69: ** max reads a chunk of data on size INPUT_BUFFER_SIZE, it can be used
70: ** with both blocking or non-blocking sockets. It will always return to
71: ** the event loop, however if we are using blocking I/O then we get a full
72: ** buffer read, otherwise we get what's available.
73: **
74: ** Returns HT_LOADED if finished reading
75: ** HT_OK if OK, but more to read
76: ** HT_ERROR if error,
77: ** HT_WOULD_BLOCK if read or write would block
78: ** HT_PAUSE if stream is paused
79: */
2.13 eric 80: char * strnstr(char * haystack, int *pLen, char * needle)
81: {
82: int found = 0;
83: int need = strlen(needle);
84: int i, start;
85: for (start = i = 0; i < *pLen; i++)
86: if (haystack[i] == needle[found]) {
87: if (++found == need) {
88: i -= need - 1; /* beginning of string */
89: *pLen -= i;
90: return haystack+i;
91: }
92: } else {
93: found = 0;
94: }
95: *pLen = 0;
96: return NULL;
97: }
98:
2.9 frystyk 99: int DebugBufferSize = INPUT_BUFFER_SIZE;
100:
2.1 frystyk 101: PRIVATE int HTReader_read (HTInputStream * me)
102: {
2.9 frystyk 103: HTHost * host = me->host;
104: SOCKET soc = HTChannel_socket(me->ch);
105: HTNet * net = HTHost_getReadNet(host);
106: HTRequest * request = HTNet_request(net);
2.1 frystyk 107: int status;
108:
2.9 frystyk 109: /* me->b_read = me->read - me->data; */
2.1 frystyk 110: /* Read from socket if we got rid of all the data previously read */
111: do {
2.9 frystyk 112: /* don't read if we have to push unwritten data from last call */
2.1 frystyk 113: if (me->write >= me->read) {
2.9 frystyk 114: if ((me->b_read = NETREAD(soc, me->data, DebugBufferSize)) < 0) {
2.1 frystyk 115: #ifdef EAGAIN
116: if (socerrno==EAGAIN || socerrno==EWOULDBLOCK) /* POSIX */
117: #else
118: if (socerrno==EWOULDBLOCK) /* BSD */
119: #endif
120: {
121: if (PROT_TRACE)
122: HTTrace("Read Socket. WOULD BLOCK fd %d\n",soc);
2.9 frystyk 123: HTHost_register(host, net, HTEvent_READ);
2.1 frystyk 124: return HT_WOULD_BLOCK;
125: #ifdef __svr4__
126: /*
127: ** In Solaris envirnoment, SIGPOLL is used to signal end of buffer for
128: ** /dev/audio. If your process is also doing a socket read, it will cause
129: ** an EINTR error. This error will cause the www library request to
130: ** terminate prematurly.
131: */
132: } else if (socerrno == EINTR) {
133: continue;
134: #endif /* __svr4__ */
2.9 frystyk 135: #ifdef EPIPE
136: } else if (socerrno == EPIPE) {
137: goto socketClosed;
138: #endif /* EPIPE */
2.1 frystyk 139: } else { /* We have a real error */
140:
141: /* HERE WE SHOULD RETURN target abort */
2.9 frystyk 142: if (request)
143: HTRequest_addSystemError(request, ERR_FATAL, socerrno,
144: NO, "NETREAD");
2.1 frystyk 145: return HT_ERROR;
146: }
2.8 frystyk 147: #ifdef ECONNRESET
2.9 frystyk 148: } else if (!me->b_read || socerrno==ECONNRESET) {
2.8 frystyk 149: #else
2.9 frystyk 150: } else if (!me->b_read) {
2.8 frystyk 151: #endif
2.9 frystyk 152: socketClosed:
2.11 frystyk 153: if (PROT_TRACE)
154: HTTrace("Read Socket. FIN received on socket %d\n", soc);
2.9 frystyk 155: if (request) {
156: HTAlertCallback *cbf = HTAlert_find(HT_PROG_DONE);
157: if (PROT_TRACE)
158: if (cbf) (*cbf)(request, HT_PROG_DONE,
159: HT_MSG_NULL, NULL, NULL, NULL);
160: }
161: HTHost_unregister(host, net, HTEvent_READ);
2.1 frystyk 162: return HT_CLOSED;
163: }
164:
165: /* Remember how much we have read from the input socket */
2.10 eric 166: HTTraceData(me->data, me->b_read, "HTReader_read me->data:");
2.1 frystyk 167: me->write = me->data;
2.9 frystyk 168: me->read = me->data + me->b_read;
2.13 eric 169: #ifdef FIND_SIGNATURES
170: {
171: char * ptr = me->data;
172: int len = me->b_read;
173: while ((ptr = strnstr(ptr, &len, "HTTP/1.1 200 OK")) != NULL) {
174: if (PROT_TRACE)
175: HTTrace("Read Socket. Signature found at 0x%x of 0x%x.\n", ptr - me->data, me->b_read);
176: ptr++;
177: len--;
178: }
179: }
180: #endif /* FIND_SIGNATURES */
2.1 frystyk 181: #ifdef NOT_ASCII
182: {
183: char *p = me->data;
184: while (p < me->read) {
185: *p = FROMASCII(*p);
186: p++;
187: }
188: }
189: #endif /* NOT_ASCII */
190:
191: if (PROT_TRACE)
192: HTTrace("Read Socket. %d bytes read from socket %d\n",
2.9 frystyk 193: me->b_read, soc);
194: if (request) {
2.1 frystyk 195: HTAlertCallback * cbf = HTAlert_find(HT_PROG_READ);
2.9 frystyk 196: #if 0
197: /* byte account is done later */
198: net->bytesRead += me->b_read;
199: #endif
200: if (cbf) (*cbf)(request, HT_PROG_READ,
2.1 frystyk 201: HT_MSG_NULL, NULL, NULL, NULL);
202: }
203: }
204:
205: /* Now push the data down the stream */
2.9 frystyk 206: if ((status = (*net->readStream->isa->put_block)
207: (net->readStream, me->write, me->b_read)) != HT_OK) {
2.1 frystyk 208: if (status == HT_WOULD_BLOCK) {
209: if (PROT_TRACE) HTTrace("Read Socket. Target WOULD BLOCK\n");
2.9 frystyk 210: HTHost_unregister(host, net, HTEvent_READ);
2.1 frystyk 211: return HT_WOULD_BLOCK;
212: } else if (status == HT_PAUSE) {
213: if (PROT_TRACE) HTTrace("Read Socket. Target PAUSED\n");
2.9 frystyk 214: HTHost_unregister(host, net, HTEvent_READ);
2.1 frystyk 215: return HT_PAUSE;
2.9 frystyk 216: /* CONTINUE code or stream code means data was consumed */
217: } else if (status == HT_CONTINUE || status > 0) {
218: if (status == HT_CONTINUE) {
219: if (PROT_TRACE) HTTrace("Read Socket. CONTINUE\n");
220: } else
221: if (PROT_TRACE)
222: HTTrace("Read Socket. Target returns %d\n", status);
223: /* me->write = me->read; */
2.1 frystyk 224: return status;
225: } else { /* We have a real error */
226: if (PROT_TRACE) HTTrace("Read Socket. Target ERROR\n");
227: return status;
228: }
229: }
2.9 frystyk 230: me->write = me->read;
231: HTHost_setRemainingRead(host, 0);
2.1 frystyk 232: } while (net->preemptive);
2.9 frystyk 233: HTHost_register(host, net, HTEvent_READ);
2.1 frystyk 234: return HT_WOULD_BLOCK;
235: }
236:
237: /*
238: ** The difference between the close and the free method is that we don't
239: ** close the connection in the free method - we only call the free method
240: ** of the target stream. That way, we can keep the input stream as long
241: ** as the channel itself.
242: */
243: PRIVATE int HTReader_close (HTInputStream * me)
244: {
245: int status = HT_OK;
2.9 frystyk 246: HTNet * net = HTHost_getReadNet(me->host);
247: if (net && net->readStream) {
248: if ((status = (*net->readStream->isa->_free)(net->readStream))==HT_WOULD_BLOCK)
2.1 frystyk 249: return HT_WOULD_BLOCK;
2.9 frystyk 250: net->readStream = NULL;
2.1 frystyk 251: }
252: if (PROT_TRACE) HTTrace("Socket read. FREEING....\n");
253: HT_FREE(me);
254: return status;
255: }
256:
2.9 frystyk 257: PUBLIC int HTReader_consumed (HTInputStream * me, size_t bytes)
258: {
259: me->write += bytes;
260: me->b_read -= bytes;
261: HTHost_setRemainingRead(me->host, me->b_read);
262: return HT_OK;
263: }
264:
2.1 frystyk 265: PRIVATE const HTInputStreamClass HTReader =
266: {
267: "SocketReader",
268: HTReader_flush,
269: HTReader_free,
270: HTReader_abort,
271: HTReader_read,
2.9 frystyk 272: HTReader_close,
273: HTReader_consumed
2.1 frystyk 274: };
275:
276: /*
277: ** Create a new input read stream. Before we actually create it we check
278: ** to see whether we already have an input stream for this channel and if
279: ** so we just return that. This means that we can reuse input streams
280: ** in persistent connections, for example.
281: */
2.9 frystyk 282: PUBLIC HTInputStream * HTReader_new (HTHost * host, HTChannel * ch,
283: void * param, int mode)
2.1 frystyk 284: {
2.9 frystyk 285: if (host && ch) {
2.1 frystyk 286: HTInputStream * me = HTChannel_input(ch);
287: if (me == NULL) {
288: if ((me=(HTInputStream *) HT_CALLOC(1, sizeof(HTInputStream))) == NULL)
289: HT_OUTOFMEM("HTReader_new");
290: me->isa = &HTReader;
291: me->ch = ch;
2.9 frystyk 292: me->host = host;
2.1 frystyk 293: }
294: return me;
295: }
296: return NULL;
297: }
2.9 frystyk 298:
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