Annotation of libwww/Library/src/HTReader.c, revision 2.12
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.
2.12 ! frystyk 6: ** @(#) $Id: HTReader.c,v 2.11 1996/12/07 15:55:52 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 */
31: char data [INPUT_BUFFER_SIZE]; /* buffer */
2.9 frystyk 32: int b_read;
2.1 frystyk 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: */
2.9 frystyk 80: int DebugBufferSize = INPUT_BUFFER_SIZE;
81:
82: /* #include fakeReader.c */
2.1 frystyk 83: PRIVATE int HTReader_read (HTInputStream * me)
84: {
2.9 frystyk 85: HTHost * host = me->host;
86: SOCKET soc = HTChannel_socket(me->ch);
87: HTNet * net = HTHost_getReadNet(host);
88: HTRequest * request = HTNet_request(net);
2.1 frystyk 89: int status;
90:
2.9 frystyk 91: /* me->b_read = me->read - me->data; */
2.1 frystyk 92: /* Read from socket if we got rid of all the data previously read */
93: do {
2.9 frystyk 94: /* don't read if we have to push unwritten data from last call */
2.1 frystyk 95: if (me->write >= me->read) {
2.9 frystyk 96: if ((me->b_read = NETREAD(soc, me->data, DebugBufferSize)) < 0) {
2.1 frystyk 97: #ifdef EAGAIN
98: if (socerrno==EAGAIN || socerrno==EWOULDBLOCK) /* POSIX */
99: #else
100: if (socerrno==EWOULDBLOCK) /* BSD */
101: #endif
102: {
103: if (PROT_TRACE)
104: HTTrace("Read Socket. WOULD BLOCK fd %d\n",soc);
2.9 frystyk 105: HTHost_register(host, net, HTEvent_READ);
2.1 frystyk 106: return HT_WOULD_BLOCK;
107: #ifdef __svr4__
108: /*
109: ** In Solaris envirnoment, SIGPOLL is used to signal end of buffer for
110: ** /dev/audio. If your process is also doing a socket read, it will cause
111: ** an EINTR error. This error will cause the www library request to
112: ** terminate prematurly.
113: */
114: } else if (socerrno == EINTR) {
115: continue;
116: #endif /* __svr4__ */
2.9 frystyk 117: #ifdef EPIPE
118: } else if (socerrno == EPIPE) {
119: goto socketClosed;
120: #endif /* EPIPE */
2.1 frystyk 121: } else { /* We have a real error */
122:
123: /* HERE WE SHOULD RETURN target abort */
2.9 frystyk 124: if (request)
125: HTRequest_addSystemError(request, ERR_FATAL, socerrno,
126: NO, "NETREAD");
2.1 frystyk 127: return HT_ERROR;
128: }
2.8 frystyk 129: #ifdef ECONNRESET
2.9 frystyk 130: } else if (!me->b_read || socerrno==ECONNRESET) {
2.8 frystyk 131: #else
2.9 frystyk 132: } else if (!me->b_read) {
2.8 frystyk 133: #endif
2.9 frystyk 134: socketClosed:
2.11 frystyk 135: if (PROT_TRACE)
136: HTTrace("Read Socket. FIN received on socket %d\n", soc);
2.9 frystyk 137: if (request) {
138: HTAlertCallback *cbf = HTAlert_find(HT_PROG_DONE);
139: if (PROT_TRACE)
140: if (cbf) (*cbf)(request, HT_PROG_DONE,
141: HT_MSG_NULL, NULL, NULL, NULL);
142: }
143: HTHost_unregister(host, net, HTEvent_READ);
2.1 frystyk 144: return HT_CLOSED;
145: }
146:
147: /* Remember how much we have read from the input socket */
2.10 eric 148: HTTraceData(me->data, me->b_read, "HTReader_read me->data:");
2.1 frystyk 149: me->write = me->data;
2.9 frystyk 150: me->read = me->data + me->b_read;
2.1 frystyk 151:
152: #ifdef NOT_ASCII
153: {
154: char *p = me->data;
155: while (p < me->read) {
156: *p = FROMASCII(*p);
157: p++;
158: }
159: }
160: #endif /* NOT_ASCII */
161:
162: if (PROT_TRACE)
163: HTTrace("Read Socket. %d bytes read from socket %d\n",
2.9 frystyk 164: me->b_read, soc);
165: if (request) {
2.1 frystyk 166: HTAlertCallback * cbf = HTAlert_find(HT_PROG_READ);
2.9 frystyk 167: #if 0
168: /* byte account is done later */
169: net->bytesRead += me->b_read;
170: #endif
171: if (cbf) (*cbf)(request, HT_PROG_READ,
2.1 frystyk 172: HT_MSG_NULL, NULL, NULL, NULL);
173: }
174: }
175:
176: /* Now push the data down the stream */
2.9 frystyk 177: if ((status = (*net->readStream->isa->put_block)
178: (net->readStream, me->write, me->b_read)) != HT_OK) {
2.1 frystyk 179: if (status == HT_WOULD_BLOCK) {
180: if (PROT_TRACE) HTTrace("Read Socket. Target WOULD BLOCK\n");
2.9 frystyk 181: HTHost_unregister(host, net, HTEvent_READ);
2.1 frystyk 182: return HT_WOULD_BLOCK;
183: } else if (status == HT_PAUSE) {
184: if (PROT_TRACE) HTTrace("Read Socket. Target PAUSED\n");
2.9 frystyk 185: HTHost_unregister(host, net, HTEvent_READ);
2.1 frystyk 186: return HT_PAUSE;
2.9 frystyk 187: /* CONTINUE code or stream code means data was consumed */
188: } else if (status == HT_CONTINUE || status > 0) {
189: if (status == HT_CONTINUE) {
190: if (PROT_TRACE) HTTrace("Read Socket. CONTINUE\n");
191: } else
192: if (PROT_TRACE)
193: HTTrace("Read Socket. Target returns %d\n", status);
194: /* me->write = me->read; */
2.1 frystyk 195: return status;
196: } else { /* We have a real error */
197: if (PROT_TRACE) HTTrace("Read Socket. Target ERROR\n");
198: return status;
199: }
200: }
2.9 frystyk 201: me->write = me->read;
202: HTHost_setRemainingRead(host, 0);
2.1 frystyk 203: } while (net->preemptive);
2.9 frystyk 204: HTHost_register(host, net, HTEvent_READ);
2.1 frystyk 205: return HT_WOULD_BLOCK;
206: }
207:
208: /*
209: ** The difference between the close and the free method is that we don't
210: ** close the connection in the free method - we only call the free method
211: ** of the target stream. That way, we can keep the input stream as long
212: ** as the channel itself.
213: */
214: PRIVATE int HTReader_close (HTInputStream * me)
215: {
216: int status = HT_OK;
2.9 frystyk 217: HTNet * net = HTHost_getReadNet(me->host);
218: if (net && net->readStream) {
219: if ((status = (*net->readStream->isa->_free)(net->readStream))==HT_WOULD_BLOCK)
2.1 frystyk 220: return HT_WOULD_BLOCK;
2.9 frystyk 221: net->readStream = NULL;
2.1 frystyk 222: }
223: if (PROT_TRACE) HTTrace("Socket read. FREEING....\n");
224: HT_FREE(me);
225: return status;
226: }
227:
2.9 frystyk 228: PUBLIC int HTReader_consumed (HTInputStream * me, size_t bytes)
229: {
230: me->write += bytes;
231: me->b_read -= bytes;
232: HTHost_setRemainingRead(me->host, me->b_read);
233: return HT_OK;
234: }
235:
2.1 frystyk 236: PRIVATE const HTInputStreamClass HTReader =
237: {
238: "SocketReader",
239: HTReader_flush,
240: HTReader_free,
241: HTReader_abort,
242: HTReader_read,
2.9 frystyk 243: HTReader_close,
244: HTReader_consumed
2.1 frystyk 245: };
246:
247: /*
248: ** Create a new input read stream. Before we actually create it we check
249: ** to see whether we already have an input stream for this channel and if
250: ** so we just return that. This means that we can reuse input streams
251: ** in persistent connections, for example.
252: */
2.9 frystyk 253: PUBLIC HTInputStream * HTReader_new (HTHost * host, HTChannel * ch,
254: void * param, int mode)
2.1 frystyk 255: {
2.9 frystyk 256: if (host && ch) {
2.1 frystyk 257: HTInputStream * me = HTChannel_input(ch);
258: if (me == NULL) {
259: if ((me=(HTInputStream *) HT_CALLOC(1, sizeof(HTInputStream))) == NULL)
260: HT_OUTOFMEM("HTReader_new");
261: me->isa = &HTReader;
262: me->ch = ch;
2.9 frystyk 263: me->host = host;
2.1 frystyk 264: }
265: return me;
266: }
267: return NULL;
268: }
2.9 frystyk 269:
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