Annotation of libwww/Library/src/HTBufWrt.c, revision 2.9
2.1 frystyk 1: /*
2: ** BUFFERED TRANSPORT WRITER STREAM
3: **
4: ** (c) COPYRIGHT MIT 1995.
5: ** Please first read the full copyright statement in the file COPYRIGH.
2.9 ! eric 6: ** @(#) $Id: HTBufWrt.c,v 2.8 1996/12/07 15:55:43 frystyk Exp $
2.1 frystyk 7: **
8: ** A buffered output stream. This stream lets you write characters to a
9: ** stream without causing a write every time. The data is first written
10: ** into a buffer. Data is written to the actual stream only when the
11: ** buffer is full, or when the stream is flushed.
12: */
13:
14: /* Library include files */
15: #include "sysdep.h"
16: #include "WWWUtil.h"
17: #include "WWWCore.h"
18: #include "HTNetMan.h"
19: #include "HTWriter.h"
2.6 frystyk 20: #include "HTTimer.h"
2.1 frystyk 21: #include "HTBufWrt.h" /* Implemented here */
22:
23: struct _HTOutputStream {
24: const HTOutputStreamClass * isa;
25: HTOutputStream * target; /* Target for outgoing data */
2.6 frystyk 26: HTHost * host;
2.1 frystyk 27: int size; /* Buffer size */
2.3 frystyk 28: int bb;
2.1 frystyk 29: char * block;
30: char * read; /* Position in 'data' */
31: char * data; /* buffer */
2.6 frystyk 32:
33: BOOL delaying;
2.7 frystyk 34: ms_t lastFlushTime; /* polar coordinates of the moon */
2.6 frystyk 35: HTTimer * timer;
2.1 frystyk 36: };
37:
38: #define PUTBLOCK(b,l) (*me->target->isa->put_block)(me->target,(b),(l))
39:
40: /* ------------------------------------------------------------------------- */
41:
42: PRIVATE int HTBufferWriter_flush (HTOutputStream * me)
43: {
44: int status = HT_OK;
2.6 frystyk 45: if (me == NULL) return HT_ERROR;
2.1 frystyk 46: if (me->read > me->data) {
47: if ((status = PUTBLOCK(me->data, me->read - me->data))==HT_WOULD_BLOCK)
48: return HT_WOULD_BLOCK;
2.6 frystyk 49: me->lastFlushTime = HTGetTimeInMillis();
2.1 frystyk 50: me->read = me->data;
51: me->block = NULL;
52: }
2.6 frystyk 53: if (me->timer) {
54: HTTimer_delete(me->timer);
55: me->timer = NULL;
56: }
2.1 frystyk 57: return status;
58: }
59:
2.9 ! eric 60: PRIVATE int FlushEvent (HTTimer * timer, void * param, HTEventType type)
2.6 frystyk 61: {
62: HTOutputStream * me = (HTOutputStream *) param;
63: if (timer != me->timer) HTDebugBreak();
64: HTBufferWriter_flush(me);
65: return HT_OK;
66: }
67:
68: PRIVATE int HTBufferWriter_lazyFlush (HTOutputStream * me)
69: {
70: HTNet * net;
71: int delay;
72:
73: if (me->read <= me->data)
74: return HT_OK; /* nothing to flush */
75: /*
76: ** If we are allowed to delay the flush then set a timer with the
77: ** delay descibed by our delay variable. If we can't delay then flush
78: ** right away.
79: */
80: delay = HTHost_writeDelay(me->host, me->lastFlushTime, me->read - me->data);
81:
82: /*
83: ** Flush immediately
84: */
85: if (!delay)
86: return HTBufferWriter_flush(me);
87:
88: /*
89: ** Delayed flush
90: */
91: if (me->timer) /* already queued to flush */
92: return HT_OK;
93:
94: /*
95: ** Set a timer and tell the host we've done the write
96: */
97: net = HTHost_getWriteNet(me->host);
98: me->timer = HTTimer_new(NULL, FlushEvent, me, delay, YES);
99: HTHost_unregister(me->host, net, HTEvent_WRITE);
100: if (PROT_TRACE) HTTrace("Buffer...... Waiting...\n");
101: return HT_OK;
102: }
103:
2.1 frystyk 104: PRIVATE int HTBufferWriter_free (HTOutputStream * me)
105: {
106: return HTBufferWriter_flush(me);
107: }
108:
109: PRIVATE int HTBufferWriter_abort (HTOutputStream * me, HTList * e)
110: {
2.8 frystyk 111: if (PROT_TRACE) HTTrace("Buffer...... ABORTING...\n");
2.1 frystyk 112: if (me->target) (*me->target->isa->abort)(me->target, e);
2.8 frystyk 113: if (me->timer) {
114: HTTimer_delete(me->timer);
115: me->timer = NULL;
116: }
2.1 frystyk 117: return HT_ERROR;
118: }
119:
2.6 frystyk 120: PRIVATE int HTBufferWriter_write (HTOutputStream * me, const char * buf, int len)
2.1 frystyk 121: {
2.6 frystyk 122: HTNet * net = HTHost_getWriteNet(me->host);
2.4 frystyk 123: long total = len;
2.1 frystyk 124: int status;
2.4 frystyk 125:
2.3 frystyk 126: if (me->bb > 0) {
2.1 frystyk 127: len -= (me->block - buf);
2.3 frystyk 128: if ((status = PUTBLOCK(me->block, me->bb)) != HT_OK) return status;
2.6 frystyk 129: me->lastFlushTime = HTGetTimeInMillis();
2.3 frystyk 130: me->block += me->bb;
131: len -= me->bb;
132: me->bb = 0;
133: } else {
134: int available = me->data + me->size - me->read;
135:
136: /* Still room in buffer */
137: if (len <= available) {
138: memcpy(me->read, buf, len);
139: me->read += len;
140: return HT_OK;
141: }
142:
143: /* If already data in buffer then fill it and flush */
144: if (me->read > me->data) {
145: memcpy(me->read, buf, available);
146: me->block = (char *) buf+available;
2.6 frystyk 147: if (me->timer && me->delaying) {
148: HTTimer_delete(me->timer);
149: me->timer=NULL;
150: me->delaying = NO;
151: }
2.4 frystyk 152: if ((status = PUTBLOCK(me->data, me->size))!=HT_OK) return status;
2.6 frystyk 153: me->lastFlushTime = HTGetTimeInMillis();
2.3 frystyk 154: }
155:
156: /* If more data then write n times buffer size */
157: if (!me->block)
158: me->block = (char *) buf;
159: else {
160: len -= (me->block - buf);
161: }
162: me->bb = len - len%me->size;
2.6 frystyk 163: if (me->bb) {
164: if ((status = PUTBLOCK(me->block, me->bb)) != HT_OK) return status;
165: me->lastFlushTime = HTGetTimeInMillis();
166: }
2.3 frystyk 167: me->block += me->bb;
168: len -= me->bb;
169: me->bb = 0;
2.1 frystyk 170: }
171:
172: /* If data is not aligned then save the rest in our buffer */
173: if (len > 0) {
174: memcpy(me->data, me->block, len);
175: me->read = me->data + len;
176: } else
177: me->read = me->data;
178: me->block = NULL;
2.6 frystyk 179: HTNet_addBytesWritten(net, total);
2.1 frystyk 180: return HT_OK;
181: }
182:
183: /* Character handling
184: ** ------------------
185: */
186: PRIVATE int HTBufferWriter_put_character (HTOutputStream * me, char c)
187: {
188: return HTBufferWriter_write(me, &c, 1);
189: }
190:
191: /* String handling
192: ** ---------------
193: **
194: ** Strings must be smaller than this buffer size.
195: */
196: PRIVATE int HTBufferWriter_put_string (HTOutputStream * me, const char * s)
197: {
198: return HTBufferWriter_write(me, s, (int) strlen(s));
199: }
200: /*
201: ** The difference between the close and the free method is that we don't
202: ** close the connection in the free method - we only call the free method
203: ** of the target stream. That way, we can keep the output stream as long
204: ** as the channel itself.
205: */
206: PRIVATE int HTBufferWriter_close (HTOutputStream * me)
207: {
208: if (me) {
209: HTBufferWriter_flush(me);
210: if (me->target) (*me->target->isa->close)(me->target);
211: HT_FREE(me->data);
212: HT_FREE(me);
213: }
214: return HT_OK;
215: }
216:
217: PRIVATE const HTOutputStreamClass HTBufferWriter =
218: {
2.6 frystyk 219: "BufferedSocketWriter",
220: HTBufferWriter_lazyFlush,
2.1 frystyk 221: HTBufferWriter_free,
222: HTBufferWriter_abort,
223: HTBufferWriter_put_character,
224: HTBufferWriter_put_string,
225: HTBufferWriter_write,
226: HTBufferWriter_close
227: };
228:
2.6 frystyk 229: PUBLIC HTOutputStream * HTBufferWriter_new (HTHost * host, HTChannel * ch,
2.1 frystyk 230: void * param, int bufsize)
231: {
2.6 frystyk 232: if (host && ch) {
2.1 frystyk 233: HTOutputStream * me = HTChannel_output(ch);
2.6 frystyk 234: if (!me) {
235: HTOutputStream * me;
2.1 frystyk 236: if (bufsize <= 0) bufsize = OUTPUT_BUFFER_SIZE;
2.6 frystyk 237: if ((me = (HTOutputStream *) HT_CALLOC(1, sizeof(HTOutputStream)))==NULL ||
2.1 frystyk 238: (me->data = (char *) HT_MALLOC(bufsize)) == NULL)
239: HT_OUTOFMEM("HTBufferWriter_new");
240: me->isa = &HTBufferWriter;
241: me->read = me->data;
242: me->size = bufsize;
2.6 frystyk 243: me->target = HTWriter_new(host, ch, param, 0);
244: me->host = host;
245: return me;
246: }
2.1 frystyk 247: }
248: return NULL;
249: }
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