Annotation of libwww/Library/src/HTReader.c, revision 2.29
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.
2.29 ! frystyk 6: ** @(#) $Id: HTReader.c,v 2.28 1998/11/20 15:53:48 frystyk Exp $
2.1 frystyk 7: **
8: ** HISTORY:
9: ** 6 June 95 HFN Written
10: */
11:
12: /* Library Include files */
2.23 frystyk 13: #include "wwwsys.h"
2.1 frystyk 14: #include "WWWUtil.h"
2.5 frystyk 15: #include "WWWCore.h"
2.1 frystyk 16: #include "HTNetMan.h"
17: #include "HTReader.h" /* Implemented here */
18:
19: struct _HTStream {
20: const HTStreamClass * isa;
21: /* ... */
22: };
23:
24: struct _HTInputStream {
25: const HTInputStreamClass * isa;
26: HTChannel * ch;
2.9 frystyk 27: HTHost * host;
2.1 frystyk 28: char * write; /* Last byte written */
29: char * read; /* Last byte read */
2.15 frystyk 30: int b_read;
2.1 frystyk 31: char data [INPUT_BUFFER_SIZE]; /* buffer */
32: };
33:
34: /* ------------------------------------------------------------------------- */
35:
36: PRIVATE int HTReader_flush (HTInputStream * me)
37: {
2.9 frystyk 38: HTNet * net = HTHost_getReadNet(me->host);
39: return net && net->readStream ? (*net->readStream->isa->flush)(net->readStream) : HT_OK;
2.1 frystyk 40: }
41:
42: PRIVATE int HTReader_free (HTInputStream * me)
43: {
2.9 frystyk 44: HTNet * net = HTHost_getReadNet(me->host);
45: if (net && net->readStream) {
46: int status = (*net->readStream->isa->_free)(net->readStream);
2.19 frystyk 47: if (status == HT_OK) net->readStream = NULL;
2.1 frystyk 48: return status;
49: }
50: return HT_OK;
51: }
52:
53: PRIVATE int HTReader_abort (HTInputStream * me, HTList * e)
54: {
2.9 frystyk 55: HTNet * net = HTHost_getReadNet(me->host);
56: if (net && net->readStream) {
57: int status = (*net->readStream->isa->abort)(net->readStream, NULL);
58: if (status != HT_IGNORE) net->readStream = NULL;
2.1 frystyk 59: }
60: return HT_ERROR;
61: }
62:
63: /* Push data from a socket down a stream
64: ** -------------------------------------
65: **
66: ** This routine is responsible for creating and PRESENTING any
67: ** graphic (or other) objects described by the file. As this function
68: ** max reads a chunk of data on size INPUT_BUFFER_SIZE, it can be used
69: ** with both blocking or non-blocking sockets. It will always return to
70: ** the event loop, however if we are using blocking I/O then we get a full
71: ** buffer read, otherwise we get what's available.
72: **
73: ** Returns HT_LOADED if finished reading
74: ** HT_OK if OK, but more to read
75: ** HT_ERROR if error,
76: ** HT_WOULD_BLOCK if read or write would block
77: ** HT_PAUSE if stream is paused
78: */
2.13 eric 79: char * strnstr(char * haystack, int *pLen, char * needle)
80: {
81: int found = 0;
82: int need = strlen(needle);
83: int i, start;
84: for (start = i = 0; i < *pLen; i++)
85: if (haystack[i] == needle[found]) {
86: if (++found == need) {
87: i -= need - 1; /* beginning of string */
88: *pLen -= i;
89: return haystack+i;
90: }
91: } else {
92: found = 0;
93: }
94: *pLen = 0;
95: return NULL;
96: }
97:
2.20 frystyk 98: /* int DebugBufferSize = INPUT_BUFFER_SIZE; */
2.9 frystyk 99:
2.1 frystyk 100: PRIVATE int HTReader_read (HTInputStream * me)
101: {
2.9 frystyk 102: HTHost * host = me->host;
103: SOCKET soc = HTChannel_socket(me->ch);
104: HTNet * net = HTHost_getReadNet(host);
105: HTRequest * request = HTNet_request(net);
2.1 frystyk 106: int status;
2.19 frystyk 107: if (!net->readStream) {
2.29 ! frystyk 108: HTTRACE(STREAM_TRACE, "Read Socket. No read stream for net object %p\n" _ net);
2.19 frystyk 109: return HT_ERROR;
110: }
111:
2.9 frystyk 112: /* me->b_read = me->read - me->data; */
2.1 frystyk 113: /* Read from socket if we got rid of all the data previously read */
114: do {
2.9 frystyk 115: /* don't read if we have to push unwritten data from last call */
2.1 frystyk 116: if (me->write >= me->read) {
2.20 frystyk 117: if ((me->b_read = NETREAD(soc, me->data, INPUT_BUFFER_SIZE)) < 0) {
2.1 frystyk 118: #ifdef EAGAIN
119: if (socerrno==EAGAIN || socerrno==EWOULDBLOCK) /* POSIX */
120: #else
121: if (socerrno==EWOULDBLOCK) /* BSD */
122: #endif
123: {
2.29 ! frystyk 124: HTTRACE(STREAM_TRACE, "Read Socket. WOULD BLOCK fd %d\n" _ soc);
2.9 frystyk 125: HTHost_register(host, net, HTEvent_READ);
2.1 frystyk 126: return HT_WOULD_BLOCK;
127: #ifdef __svr4__
2.27 frystyk 128: /*
129: ** In Solaris envirnoment, SIGPOLL is used to signal end of buffer for
130: ** /dev/audio. If your process is also doing a socket read, it will cause
131: ** an EINTR error. This error will cause the www library request to
132: ** terminate prematurly.
133: */
2.1 frystyk 134: } else if (socerrno == EINTR) {
135: continue;
136: #endif /* __svr4__ */
2.9 frystyk 137: #ifdef EPIPE
138: } else if (socerrno == EPIPE) {
2.29 ! frystyk 139: HTTRACE(STREAM_TRACE, "Read Socket. got EPIPE\n" _ soc);
2.9 frystyk 140: goto socketClosed;
141: #endif /* EPIPE */
2.27 frystyk 142: #ifdef ECONNRESET
143: } else if (socerrno == ECONNRESET) {
2.29 ! frystyk 144: HTTRACE(STREAM_TRACE, "Read Socket. got ECONNRESET\n" _ soc);
2.27 frystyk 145: goto socketClosed;
146: #endif /* ECONNRESET */
2.1 frystyk 147: } else { /* We have a real error */
148:
2.9 frystyk 149: if (request)
150: HTRequest_addSystemError(request, ERR_FATAL, socerrno,
151: NO, "NETREAD");
2.1 frystyk 152: return HT_ERROR;
153: }
2.9 frystyk 154: } else if (!me->b_read) {
2.27 frystyk 155:
2.9 frystyk 156: socketClosed:
2.29 ! frystyk 157: HTTRACE(STREAM_TRACE, "Read Socket. FIN received on socket %d\n" _ soc);
2.9 frystyk 158: HTHost_unregister(host, net, HTEvent_READ);
2.18 frystyk 159: HTHost_register(host, net, HTEvent_CLOSE);
2.1 frystyk 160: return HT_CLOSED;
161: }
162:
163: /* Remember how much we have read from the input socket */
2.29 ! frystyk 164: HTTRACEDATA(me->data, me->b_read, "Reading from socket %d" _ soc);
2.1 frystyk 165: me->write = me->data;
2.9 frystyk 166: me->read = me->data + me->b_read;
2.13 eric 167: #ifdef FIND_SIGNATURES
168: {
169: char * ptr = me->data;
170: int len = me->b_read;
171: while ((ptr = strnstr(ptr, &len, "HTTP/1.1 200 OK")) != NULL) {
2.29 ! frystyk 172: HTTRACE(STREAM_TRACE, "Read Socket. Signature found at 0x%x of 0x%x.\n" _ ptr - me->data _ me->b_read);
2.13 eric 173: ptr++;
174: len--;
175: }
176: }
177: #endif /* FIND_SIGNATURES */
2.1 frystyk 178: #ifdef NOT_ASCII
179: {
180: char *p = me->data;
181: while (p < me->read) {
182: *p = FROMASCII(*p);
183: p++;
184: }
185: }
186: #endif /* NOT_ASCII */
187:
2.29 ! frystyk 188: HTTRACE(STREAM_TRACE, "Read Socket. %d bytes read from socket %d\n" _
! 189: me->b_read _ soc);
2.9 frystyk 190: if (request) {
2.1 frystyk 191: HTAlertCallback * cbf = HTAlert_find(HT_PROG_READ);
2.26 frystyk 192: if (HTNet_rawBytesCount(net))
193: HTNet_addBytesRead(net, me->b_read);
2.28 frystyk 194: if (cbf) {
195: int tr = HTNet_bytesRead(net);
196: (*cbf)(request, HT_PROG_READ, HT_MSG_NULL, NULL, &tr, NULL);
197: }
2.1 frystyk 198: }
199: }
200:
201: /* Now push the data down the stream */
2.9 frystyk 202: if ((status = (*net->readStream->isa->put_block)
203: (net->readStream, me->write, me->b_read)) != HT_OK) {
2.1 frystyk 204: if (status == HT_WOULD_BLOCK) {
2.29 ! frystyk 205: HTTRACE(STREAM_TRACE, "Read Socket. Target WOULD BLOCK\n");
2.9 frystyk 206: HTHost_unregister(host, net, HTEvent_READ);
2.1 frystyk 207: return HT_WOULD_BLOCK;
208: } else if (status == HT_PAUSE) {
2.29 ! frystyk 209: HTTRACE(STREAM_TRACE, "Read Socket. Target PAUSED\n");
2.9 frystyk 210: HTHost_unregister(host, net, HTEvent_READ);
2.1 frystyk 211: return HT_PAUSE;
2.9 frystyk 212: /* CONTINUE code or stream code means data was consumed */
213: } else if (status == HT_CONTINUE || status > 0) {
214: if (status == HT_CONTINUE) {
2.29 ! frystyk 215: HTTRACE(STREAM_TRACE, "Read Socket. CONTINUE\n");
2.9 frystyk 216: } else
2.29 ! frystyk 217: HTTRACE(STREAM_TRACE, "Read Socket. Target returns %d\n" _ status);
2.9 frystyk 218: /* me->write = me->read; */
2.1 frystyk 219: return status;
220: } else { /* We have a real error */
2.29 ! frystyk 221: HTTRACE(STREAM_TRACE, "Read Socket. Target ERROR %d\n" _ status);
2.1 frystyk 222: return status;
223: }
224: }
2.9 frystyk 225: me->write = me->read;
2.19 frystyk 226: {
227: int remaining = HTHost_remainingRead(host);
228: if (remaining > 0) {
2.29 ! frystyk 229: HTTRACE(STREAM_TRACE, "Read Socket. DIDN'T CONSUME %d BYTES: `%s\'\n" _
! 230: remaining _ me->read);
2.19 frystyk 231: HTHost_setConsumed(host, remaining);
232: }
233: }
2.1 frystyk 234: } while (net->preemptive);
2.9 frystyk 235: HTHost_register(host, net, HTEvent_READ);
2.1 frystyk 236: return HT_WOULD_BLOCK;
237: }
238:
239: /*
240: ** The difference between the close and the free method is that we don't
241: ** close the connection in the free method - we only call the free method
242: ** of the target stream. That way, we can keep the input stream as long
243: ** as the channel itself.
244: */
245: PRIVATE int HTReader_close (HTInputStream * me)
246: {
247: int status = HT_OK;
2.9 frystyk 248: HTNet * net = HTHost_getReadNet(me->host);
249: if (net && net->readStream) {
250: if ((status = (*net->readStream->isa->_free)(net->readStream))==HT_WOULD_BLOCK)
2.1 frystyk 251: return HT_WOULD_BLOCK;
2.9 frystyk 252: net->readStream = NULL;
2.1 frystyk 253: }
2.29 ! frystyk 254: HTTRACE(STREAM_TRACE, "Socket read. FREEING....\n");
2.1 frystyk 255: HT_FREE(me);
256: return status;
257: }
258:
2.9 frystyk 259: PUBLIC int HTReader_consumed (HTInputStream * me, size_t bytes)
260: {
261: me->write += bytes;
262: me->b_read -= bytes;
263: HTHost_setRemainingRead(me->host, me->b_read);
264: return HT_OK;
265: }
266:
2.1 frystyk 267: PRIVATE const HTInputStreamClass HTReader =
268: {
269: "SocketReader",
270: HTReader_flush,
271: HTReader_free,
272: HTReader_abort,
273: HTReader_read,
2.9 frystyk 274: HTReader_close,
275: HTReader_consumed
2.1 frystyk 276: };
277:
278: /*
279: ** Create a new input read stream. Before we actually create it we check
280: ** to see whether we already have an input stream for this channel and if
281: ** so we just return that. This means that we can reuse input streams
282: ** in persistent connections, for example.
283: */
2.9 frystyk 284: PUBLIC HTInputStream * HTReader_new (HTHost * host, HTChannel * ch,
285: void * param, int mode)
2.1 frystyk 286: {
2.9 frystyk 287: if (host && ch) {
2.1 frystyk 288: HTInputStream * me = HTChannel_input(ch);
289: if (me == NULL) {
290: if ((me=(HTInputStream *) HT_CALLOC(1, sizeof(HTInputStream))) == NULL)
291: HT_OUTOFMEM("HTReader_new");
292: me->isa = &HTReader;
293: me->ch = ch;
2.9 frystyk 294: me->host = host;
2.29 ! frystyk 295: HTTRACE(STREAM_TRACE, "Reader...... Created reader stream %p\n" _ me);
2.1 frystyk 296: }
297: return me;
298: }
299: return NULL;
300: }
2.9 frystyk 301:
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