Annotation of libwww/Library/src/HTReader.c, revision 2.8.2.2
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.
2.8.2.1 eric 6: ** @(#) $Id: HTReader.c,v 2.8 1996/08/21 14:10:31 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"
2.8.2.1 eric 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;
2.8.2.1 eric 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 */
2.8.2.1 eric 32: int b_read;
2.1 frystyk 33: };
34:
35: /* ------------------------------------------------------------------------- */
36:
37: PRIVATE int HTReader_flush (HTInputStream * me)
38: {
2.8.2.1 eric 39: HTNet * net = HTHost_getReadNet(me->host);
2.8.2.2 ! eric 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: {
2.8.2.1 eric 45: HTNet * net = HTHost_getReadNet(me->host);
46: if (net && net->readStream) {
2.8.2.2 ! eric 47: int status = (*net->readStream->isa->_free)(net->readStream);
! 48: /* if (status != HT_WOULD_BLOCK) 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: {
2.8.2.1 eric 56: HTNet * net = HTHost_getReadNet(me->host);
57: if (net && net->readStream) {
2.8.2.2 ! eric 58: (*net->readStream->isa->abort)(net->readStream, NULL);
! 59: /* 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: */
80: PRIVATE int HTReader_read (HTInputStream * me)
81: {
2.8.2.1 eric 82: HTHost * host = me->host;
83: SOCKET soc = HTChannel_socket(HTHost_channel(host));
2.1 frystyk 84: int status;
2.8.2.1 eric 85: HTNet * net = HTHost_getReadNet(host);
2.1 frystyk 86:
2.8.2.2 ! eric 87: /* me->b_read = me->read - me->data; */
2.1 frystyk 88: /* Read from socket if we got rid of all the data previously read */
89: do {
2.8.2.1 eric 90: /* don't read if we have to push unwritten data from last call */
2.1 frystyk 91: if (me->write >= me->read) {
2.8.2.1 eric 92: if ((me->b_read = NETREAD(soc, me->data, INPUT_BUFFER_SIZE)) < 0) {
2.1 frystyk 93: #ifdef EAGAIN
94: if (socerrno==EAGAIN || socerrno==EWOULDBLOCK) /* POSIX */
95: #else
96: if (socerrno==EWOULDBLOCK) /* BSD */
97: #endif
98: {
99: if (PROT_TRACE)
100: HTTrace("Read Socket. WOULD BLOCK fd %d\n",soc);
2.8.2.1 eric 101: HTHost_register(host, net, HTEvent_READ);
2.1 frystyk 102: return HT_WOULD_BLOCK;
103: #ifdef __svr4__
104: /*
105: ** In Solaris envirnoment, SIGPOLL is used to signal end of buffer for
106: ** /dev/audio. If your process is also doing a socket read, it will cause
107: ** an EINTR error. This error will cause the www library request to
108: ** terminate prematurly.
109: */
110: } else if (socerrno == EINTR) {
111: continue;
112: #endif /* __svr4__ */
113: } else { /* We have a real error */
114:
115: /* HERE WE SHOULD RETURN target abort */
116:
117: HTRequest_addSystemError(net->request, ERR_FATAL, socerrno,
118: NO, "NETREAD");
119: return HT_ERROR;
120: }
2.8 frystyk 121: #ifdef ECONNRESET
2.8.2.1 eric 122: } else if (!me->b_read || socerrno==ECONNRESET) {
2.8 frystyk 123: #else
2.8.2.1 eric 124: } else if (!me->b_read) {
2.8 frystyk 125: #endif
2.1 frystyk 126: HTAlertCallback *cbf = HTAlert_find(HT_PROG_DONE);
127: if (PROT_TRACE)
2.3 frystyk 128: HTTrace("Read Socket. FIN received on socket %d\n", soc);
2.1 frystyk 129: if (cbf) (*cbf)(net->request, HT_PROG_DONE,
130: HT_MSG_NULL, NULL, NULL, NULL);
2.8.2.1 eric 131: HTHost_unregister(host, net, HTEvent_READ);
2.1 frystyk 132: return HT_CLOSED;
133: }
134:
135: /* Remember how much we have read from the input socket */
136: me->write = me->data;
2.8.2.1 eric 137: me->read = me->data + me->b_read;
2.1 frystyk 138:
139: #ifdef NOT_ASCII
140: {
141: char *p = me->data;
142: while (p < me->read) {
143: *p = FROMASCII(*p);
144: p++;
145: }
146: }
147: #endif /* NOT_ASCII */
148:
149: if (PROT_TRACE)
150: HTTrace("Read Socket. %d bytes read from socket %d\n",
2.8.2.1 eric 151: me->b_read, soc);
2.1 frystyk 152: {
153: HTAlertCallback * cbf = HTAlert_find(HT_PROG_READ);
2.8.2.1 eric 154: net->bytesRead += me->b_read;
2.1 frystyk 155: if (cbf) (*cbf)(net->request, HT_PROG_READ,
156: HT_MSG_NULL, NULL, NULL, NULL);
157: }
158: }
159:
160: /* Now push the data down the stream */
2.8.2.1 eric 161: if ((status = (*net->readStream->isa->put_block)
2.8.2.2 ! eric 162: (net->readStream, me->write, me->b_read)) != HT_OK) {
2.1 frystyk 163: if (status == HT_WOULD_BLOCK) {
164: if (PROT_TRACE) HTTrace("Read Socket. Target WOULD BLOCK\n");
2.8.2.1 eric 165: HTHost_unregister(host, net, HTEvent_READ);
2.1 frystyk 166: return HT_WOULD_BLOCK;
167: } else if (status == HT_PAUSE) {
168: if (PROT_TRACE) HTTrace("Read Socket. Target PAUSED\n");
2.8.2.1 eric 169: HTHost_unregister(host, net, HTEvent_READ);
2.1 frystyk 170: return HT_PAUSE;
2.8.2.1 eric 171: /* CONTINUE code or stream code means data was consumed */
172: } else if (status == HT_CONTINUE || status > 0) {
173: if (status == HT_CONTINUE) {
174: if (PROT_TRACE) HTTrace("Read Socket. CONTINUE\n");
175: } else
176: if (PROT_TRACE)
177: HTTrace("Read Socket. Target returns %d\n", status);
178: /* me->write = me->read; */
2.1 frystyk 179: return status;
180: } else { /* We have a real error */
181: if (PROT_TRACE) HTTrace("Read Socket. Target ERROR\n");
182: return status;
183: }
184: }
2.8.2.1 eric 185: me->write = me->read;
186: HTHost_setRemainingRead(host, 0);
2.1 frystyk 187: } while (net->preemptive);
2.8.2.1 eric 188: HTHost_register(host, net, HTEvent_READ);
2.1 frystyk 189: return HT_WOULD_BLOCK;
190: }
191:
192: /*
193: ** The difference between the close and the free method is that we don't
194: ** close the connection in the free method - we only call the free method
195: ** of the target stream. That way, we can keep the input stream as long
196: ** as the channel itself.
197: */
198: PRIVATE int HTReader_close (HTInputStream * me)
199: {
200: int status = HT_OK;
2.8.2.1 eric 201: HTNet * net = HTHost_getReadNet(me->host);
202: if (net && net->readStream) {
2.8.2.2 ! eric 203: if ((status = (*net->readStream->isa->_free)(net->readStream))==HT_WOULD_BLOCK)
2.1 frystyk 204: return HT_WOULD_BLOCK;
205: }
206: if (PROT_TRACE) HTTrace("Socket read. FREEING....\n");
207: HT_FREE(me);
208: return status;
209: }
210:
2.8.2.1 eric 211: PUBLIC int HTReader_consumed (HTInputStream * me, size_t bytes)
212: {
213: if (PROT_TRACE) HTTrace("ANSI read... consumed %d bytes\n", bytes);
214: me->write += bytes;
215: me->b_read -= bytes;
216: HTHost_setRemainingRead(me->host, me->b_read);
217: return HT_OK;
218: }
219:
2.1 frystyk 220: PRIVATE const HTInputStreamClass HTReader =
221: {
222: "SocketReader",
223: HTReader_flush,
224: HTReader_free,
225: HTReader_abort,
226: HTReader_read,
2.8.2.1 eric 227: HTReader_close,
228: HTReader_consumed
2.1 frystyk 229: };
230:
231: /*
232: ** Create a new input read stream. Before we actually create it we check
233: ** to see whether we already have an input stream for this channel and if
234: ** so we just return that. This means that we can reuse input streams
235: ** in persistent connections, for example.
236: */
2.8.2.1 eric 237: PUBLIC HTInputStream * HTReader_new (HTHost * host, HTChannel * ch,
238: void * param, int mode)
2.1 frystyk 239: {
2.8.2.1 eric 240: if (host && ch) {
2.1 frystyk 241: HTInputStream * me = HTChannel_input(ch);
242: if (me == NULL) {
243: if ((me=(HTInputStream *) HT_CALLOC(1, sizeof(HTInputStream))) == NULL)
244: HT_OUTOFMEM("HTReader_new");
245: me->isa = &HTReader;
246: me->ch = ch;
247: }
2.8.2.1 eric 248: me->host = host;
2.1 frystyk 249: return me;
250: }
251: return NULL;
252: }
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