Annotation of libwww/Library/src/HTReader.c, revision 2.8.2.8
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.
2.8.2.8 ! eric 6: ** @(#) $Id: HTReader.c,v 2.8.2.7 1996/11/07 18:47:35 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);
2.8.2.7 frystyk 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: {
2.8.2.1 eric 56: HTNet * net = HTHost_getReadNet(me->host);
57: if (net && net->readStream) {
2.8.2.7 frystyk 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: */
2.8.2.8 ! eric 80: int DebugBufferSize = INPUT_BUFFER_SIZE;
2.1 frystyk 81: PRIVATE int HTReader_read (HTInputStream * me)
82: {
2.8.2.1 eric 83: HTHost * host = me->host;
2.8.2.3 frystyk 84: SOCKET soc = HTChannel_socket(me->ch);
2.8.2.1 eric 85: HTNet * net = HTHost_getReadNet(host);
2.8.2.3 frystyk 86: HTRequest * request = HTNet_request(net);
87: int status;
2.1 frystyk 88:
2.8.2.2 eric 89: /* me->b_read = me->read - me->data; */
2.1 frystyk 90: /* Read from socket if we got rid of all the data previously read */
91: do {
2.8.2.1 eric 92: /* don't read if we have to push unwritten data from last call */
2.1 frystyk 93: if (me->write >= me->read) {
2.8.2.8 ! eric 94: if ((me->b_read = NETREAD(soc, me->data, DebugBufferSize)) < 0) {
2.1 frystyk 95: #ifdef EAGAIN
96: if (socerrno==EAGAIN || socerrno==EWOULDBLOCK) /* POSIX */
97: #else
98: if (socerrno==EWOULDBLOCK) /* BSD */
99: #endif
100: {
101: if (PROT_TRACE)
102: HTTrace("Read Socket. WOULD BLOCK fd %d\n",soc);
2.8.2.1 eric 103: HTHost_register(host, net, HTEvent_READ);
2.1 frystyk 104: return HT_WOULD_BLOCK;
105: #ifdef __svr4__
106: /*
107: ** In Solaris envirnoment, SIGPOLL is used to signal end of buffer for
108: ** /dev/audio. If your process is also doing a socket read, it will cause
109: ** an EINTR error. This error will cause the www library request to
110: ** terminate prematurly.
111: */
112: } else if (socerrno == EINTR) {
113: continue;
114: #endif /* __svr4__ */
115: } else { /* We have a real error */
116:
117: /* HERE WE SHOULD RETURN target abort */
2.8.2.3 frystyk 118: if (request)
119: HTRequest_addSystemError(request, ERR_FATAL, socerrno,
120: NO, "NETREAD");
2.1 frystyk 121: return HT_ERROR;
122: }
2.8 frystyk 123: #ifdef ECONNRESET
2.8.2.1 eric 124: } else if (!me->b_read || socerrno==ECONNRESET) {
2.8 frystyk 125: #else
2.8.2.1 eric 126: } else if (!me->b_read) {
2.8 frystyk 127: #endif
2.8.2.3 frystyk 128: HTTrace("Read Socket. FIN received on socket %d\n", soc);
129: if (request) {
130: HTAlertCallback *cbf = HTAlert_find(HT_PROG_DONE);
131: if (PROT_TRACE)
132: if (cbf) (*cbf)(request, HT_PROG_DONE,
133: HT_MSG_NULL, NULL, NULL, NULL);
134: }
135: HTHost_unregister(host, net, HTEvent_READ);
2.1 frystyk 136: return HT_CLOSED;
137: }
138:
139: /* Remember how much we have read from the input socket */
140: me->write = me->data;
2.8.2.1 eric 141: me->read = me->data + me->b_read;
2.1 frystyk 142:
143: #ifdef NOT_ASCII
144: {
145: char *p = me->data;
146: while (p < me->read) {
147: *p = FROMASCII(*p);
148: p++;
149: }
150: }
151: #endif /* NOT_ASCII */
152:
153: if (PROT_TRACE)
154: HTTrace("Read Socket. %d bytes read from socket %d\n",
2.8.2.1 eric 155: me->b_read, soc);
2.8.2.3 frystyk 156: if (request) {
2.1 frystyk 157: HTAlertCallback * cbf = HTAlert_find(HT_PROG_READ);
2.8.2.4 frystyk 158: #if 0
159: /* byte account is done later */
2.8.2.1 eric 160: net->bytesRead += me->b_read;
2.8.2.4 frystyk 161: #endif
2.8.2.3 frystyk 162: if (cbf) (*cbf)(request, HT_PROG_READ,
2.1 frystyk 163: HT_MSG_NULL, NULL, NULL, NULL);
164: }
165: }
166:
167: /* Now push the data down the stream */
2.8.2.1 eric 168: if ((status = (*net->readStream->isa->put_block)
2.8.2.2 eric 169: (net->readStream, me->write, me->b_read)) != HT_OK) {
2.1 frystyk 170: if (status == HT_WOULD_BLOCK) {
171: if (PROT_TRACE) HTTrace("Read Socket. Target WOULD BLOCK\n");
2.8.2.1 eric 172: HTHost_unregister(host, net, HTEvent_READ);
2.1 frystyk 173: return HT_WOULD_BLOCK;
174: } else if (status == HT_PAUSE) {
175: if (PROT_TRACE) HTTrace("Read Socket. Target PAUSED\n");
2.8.2.1 eric 176: HTHost_unregister(host, net, HTEvent_READ);
2.1 frystyk 177: return HT_PAUSE;
2.8.2.1 eric 178: /* CONTINUE code or stream code means data was consumed */
179: } else if (status == HT_CONTINUE || status > 0) {
180: if (status == HT_CONTINUE) {
181: if (PROT_TRACE) HTTrace("Read Socket. CONTINUE\n");
182: } else
183: if (PROT_TRACE)
184: HTTrace("Read Socket. Target returns %d\n", status);
185: /* me->write = me->read; */
2.1 frystyk 186: return status;
187: } else { /* We have a real error */
188: if (PROT_TRACE) HTTrace("Read Socket. Target ERROR\n");
189: return status;
190: }
191: }
2.8.2.1 eric 192: me->write = me->read;
193: HTHost_setRemainingRead(host, 0);
2.1 frystyk 194: } while (net->preemptive);
2.8.2.1 eric 195: HTHost_register(host, net, HTEvent_READ);
2.1 frystyk 196: return HT_WOULD_BLOCK;
197: }
198:
199: /*
200: ** The difference between the close and the free method is that we don't
201: ** close the connection in the free method - we only call the free method
202: ** of the target stream. That way, we can keep the input stream as long
203: ** as the channel itself.
204: */
205: PRIVATE int HTReader_close (HTInputStream * me)
206: {
207: int status = HT_OK;
2.8.2.1 eric 208: HTNet * net = HTHost_getReadNet(me->host);
209: if (net && net->readStream) {
2.8.2.2 eric 210: if ((status = (*net->readStream->isa->_free)(net->readStream))==HT_WOULD_BLOCK)
2.1 frystyk 211: return HT_WOULD_BLOCK;
2.8.2.6 eric 212: net->readStream = NULL;
2.1 frystyk 213: }
214: if (PROT_TRACE) HTTrace("Socket read. FREEING....\n");
215: HT_FREE(me);
216: return status;
217: }
218:
2.8.2.1 eric 219: PUBLIC int HTReader_consumed (HTInputStream * me, size_t bytes)
220: {
2.8.2.5 frystyk 221: if (PROT_TRACE) HTTrace("Socket read. consumed %d bytes\n", bytes);
2.8.2.1 eric 222: me->write += bytes;
223: me->b_read -= bytes;
224: HTHost_setRemainingRead(me->host, me->b_read);
225: return HT_OK;
226: }
227:
2.1 frystyk 228: PRIVATE const HTInputStreamClass HTReader =
229: {
230: "SocketReader",
231: HTReader_flush,
232: HTReader_free,
233: HTReader_abort,
234: HTReader_read,
2.8.2.1 eric 235: HTReader_close,
236: HTReader_consumed
2.1 frystyk 237: };
238:
239: /*
240: ** Create a new input read stream. Before we actually create it we check
241: ** to see whether we already have an input stream for this channel and if
242: ** so we just return that. This means that we can reuse input streams
243: ** in persistent connections, for example.
244: */
2.8.2.1 eric 245: PUBLIC HTInputStream * HTReader_new (HTHost * host, HTChannel * ch,
246: void * param, int mode)
2.1 frystyk 247: {
2.8.2.1 eric 248: if (host && ch) {
2.1 frystyk 249: HTInputStream * me = HTChannel_input(ch);
250: if (me == NULL) {
251: if ((me=(HTInputStream *) HT_CALLOC(1, sizeof(HTInputStream))) == NULL)
252: HT_OUTOFMEM("HTReader_new");
253: me->isa = &HTReader;
254: me->ch = ch;
2.8.2.3 frystyk 255: me->host = host;
2.1 frystyk 256: }
257: return me;
258: }
259: return NULL;
260: }
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