Annotation of libwww/Library/src/HTReader.c, revision 2.8.2.12
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.
2.8.2.12! eric 6: ** @(#) $Id: HTReader.c,v 2.8.2.11 1996/11/22 22:42:34 eric 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"
2.8.2.1 eric 16: #include "HTHost.h"
2.1 frystyk 17: #include "HTNetMan.h"
2.8.2.11 eric 18: #include "HTWatch.h"
2.1 frystyk 19: #include "HTReader.h" /* Implemented here */
20:
21: struct _HTStream {
22: const HTStreamClass * isa;
23: /* ... */
24: };
25:
26: struct _HTInputStream {
27: const HTInputStreamClass * isa;
28: HTChannel * ch;
2.8.2.1 eric 29: HTHost * host;
2.1 frystyk 30: char * write; /* Last byte written */
31: char * read; /* Last byte read */
32: char data [INPUT_BUFFER_SIZE]; /* buffer */
2.8.2.1 eric 33: int b_read;
2.1 frystyk 34: };
35:
36: /* ------------------------------------------------------------------------- */
37:
38: PRIVATE int HTReader_flush (HTInputStream * me)
39: {
2.8.2.1 eric 40: HTNet * net = HTHost_getReadNet(me->host);
2.8.2.2 eric 41: return net && net->readStream ? (*net->readStream->isa->flush)(net->readStream) : HT_OK;
2.1 frystyk 42: }
43:
44: PRIVATE int HTReader_free (HTInputStream * me)
45: {
2.8.2.1 eric 46: HTNet * net = HTHost_getReadNet(me->host);
47: if (net && net->readStream) {
2.8.2.2 eric 48: int status = (*net->readStream->isa->_free)(net->readStream);
2.8.2.7 frystyk 49: if (status == HT_OK) net->readStream = NULL;
2.1 frystyk 50: return status;
51: }
52: return HT_OK;
53: }
54:
55: PRIVATE int HTReader_abort (HTInputStream * me, HTList * e)
56: {
2.8.2.1 eric 57: HTNet * net = HTHost_getReadNet(me->host);
58: if (net && net->readStream) {
2.8.2.7 frystyk 59: int status = (*net->readStream->isa->abort)(net->readStream, NULL);
60: if (status != HT_IGNORE) net->readStream = NULL;
2.1 frystyk 61: }
62: return HT_ERROR;
63: }
64:
65: /* Push data from a socket down a stream
66: ** -------------------------------------
67: **
68: ** This routine is responsible for creating and PRESENTING any
69: ** graphic (or other) objects described by the file. As this function
70: ** max reads a chunk of data on size INPUT_BUFFER_SIZE, it can be used
71: ** with both blocking or non-blocking sockets. It will always return to
72: ** the event loop, however if we are using blocking I/O then we get a full
73: ** buffer read, otherwise we get what's available.
74: **
75: ** Returns HT_LOADED if finished reading
76: ** HT_OK if OK, but more to read
77: ** HT_ERROR if error,
78: ** HT_WOULD_BLOCK if read or write would block
79: ** HT_PAUSE if stream is paused
80: */
2.8.2.8 eric 81: int DebugBufferSize = INPUT_BUFFER_SIZE;
2.8.2.12! eric 82:
! 83: /* #include fakeReader.c */
2.1 frystyk 84: PRIVATE int HTReader_read (HTInputStream * me)
85: {
2.8.2.1 eric 86: HTHost * host = me->host;
2.8.2.3 frystyk 87: SOCKET soc = HTChannel_socket(me->ch);
2.8.2.1 eric 88: HTNet * net = HTHost_getReadNet(host);
2.8.2.3 frystyk 89: HTRequest * request = HTNet_request(net);
90: int status;
2.1 frystyk 91:
2.8.2.2 eric 92: /* me->b_read = me->read - me->data; */
2.1 frystyk 93: /* Read from socket if we got rid of all the data previously read */
94: do {
2.8.2.1 eric 95: /* don't read if we have to push unwritten data from last call */
2.1 frystyk 96: if (me->write >= me->read) {
2.8.2.8 eric 97: if ((me->b_read = NETREAD(soc, me->data, DebugBufferSize)) < 0) {
2.1 frystyk 98: #ifdef EAGAIN
99: if (socerrno==EAGAIN || socerrno==EWOULDBLOCK) /* POSIX */
100: #else
101: if (socerrno==EWOULDBLOCK) /* BSD */
102: #endif
103: {
104: if (PROT_TRACE)
105: HTTrace("Read Socket. WOULD BLOCK fd %d\n",soc);
2.8.2.1 eric 106: HTHost_register(host, net, HTEvent_READ);
2.1 frystyk 107: return HT_WOULD_BLOCK;
108: #ifdef __svr4__
109: /*
110: ** In Solaris envirnoment, SIGPOLL is used to signal end of buffer for
111: ** /dev/audio. If your process is also doing a socket read, it will cause
112: ** an EINTR error. This error will cause the www library request to
113: ** terminate prematurly.
114: */
115: } else if (socerrno == EINTR) {
116: continue;
117: #endif /* __svr4__ */
2.8.2.9 eric 118: #ifdef EPIPE
119: } else if (socerrno == EPIPE) {
120: goto socketClosed;
121: #endif /* EPIPE */
2.1 frystyk 122: } else { /* We have a real error */
123:
124: /* HERE WE SHOULD RETURN target abort */
2.8.2.3 frystyk 125: if (request)
126: HTRequest_addSystemError(request, ERR_FATAL, socerrno,
127: NO, "NETREAD");
2.1 frystyk 128: return HT_ERROR;
129: }
2.8 frystyk 130: #ifdef ECONNRESET
2.8.2.1 eric 131: } else if (!me->b_read || socerrno==ECONNRESET) {
2.8 frystyk 132: #else
2.8.2.1 eric 133: } else if (!me->b_read) {
2.8 frystyk 134: #endif
2.8.2.9 eric 135: socketClosed:
2.8.2.3 frystyk 136: HTTrace("Read Socket. FIN received on socket %d\n", soc);
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 */
2.8.2.12! eric 148: HTWatch_logData(me->data, me->b_read, "HTReader_read %d bytes:", me->b_read);
2.1 frystyk 149: me->write = me->data;
2.8.2.1 eric 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",
2.8.2.1 eric 164: me->b_read, soc);
2.8.2.3 frystyk 165: if (request) {
2.1 frystyk 166: HTAlertCallback * cbf = HTAlert_find(HT_PROG_READ);
2.8.2.4 frystyk 167: #if 0
168: /* byte account is done later */
2.8.2.1 eric 169: net->bytesRead += me->b_read;
2.8.2.4 frystyk 170: #endif
2.8.2.3 frystyk 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 */
2.8.2.1 eric 177: if ((status = (*net->readStream->isa->put_block)
2.8.2.2 eric 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");
2.8.2.1 eric 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");
2.8.2.1 eric 185: HTHost_unregister(host, net, HTEvent_READ);
2.1 frystyk 186: return HT_PAUSE;
2.8.2.1 eric 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: }
2.8.2.1 eric 201: me->write = me->read;
202: HTHost_setRemainingRead(host, 0);
2.1 frystyk 203: } while (net->preemptive);
2.8.2.1 eric 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;
2.8.2.1 eric 217: HTNet * net = HTHost_getReadNet(me->host);
218: if (net && net->readStream) {
2.8.2.2 eric 219: if ((status = (*net->readStream->isa->_free)(net->readStream))==HT_WOULD_BLOCK)
2.1 frystyk 220: return HT_WOULD_BLOCK;
2.8.2.6 eric 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:
2.8.2.1 eric 228: PUBLIC int HTReader_consumed (HTInputStream * me, size_t bytes)
229: {
2.8.2.5 frystyk 230: if (PROT_TRACE) HTTrace("Socket read. consumed %d bytes\n", bytes);
2.8.2.1 eric 231: me->write += bytes;
232: me->b_read -= bytes;
233: HTHost_setRemainingRead(me->host, me->b_read);
234: return HT_OK;
235: }
236:
2.1 frystyk 237: PRIVATE const HTInputStreamClass HTReader =
238: {
239: "SocketReader",
240: HTReader_flush,
241: HTReader_free,
242: HTReader_abort,
243: HTReader_read,
2.8.2.1 eric 244: HTReader_close,
245: HTReader_consumed
2.1 frystyk 246: };
247:
248: /*
249: ** Create a new input read stream. Before we actually create it we check
250: ** to see whether we already have an input stream for this channel and if
251: ** so we just return that. This means that we can reuse input streams
252: ** in persistent connections, for example.
253: */
2.8.2.1 eric 254: PUBLIC HTInputStream * HTReader_new (HTHost * host, HTChannel * ch,
255: void * param, int mode)
2.1 frystyk 256: {
2.8.2.1 eric 257: if (host && ch) {
2.1 frystyk 258: HTInputStream * me = HTChannel_input(ch);
259: if (me == NULL) {
260: if ((me=(HTInputStream *) HT_CALLOC(1, sizeof(HTInputStream))) == NULL)
261: HT_OUTOFMEM("HTReader_new");
262: me->isa = &HTReader;
263: me->ch = ch;
2.8.2.3 frystyk 264: me->host = host;
2.1 frystyk 265: }
266: return me;
267: }
268: return NULL;
269: }
2.8.2.12! eric 270:
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