Annotation of libwww/Library/src/HTBufWrt.c, revision 2.11
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.
2.11 ! frystyk 6: ** @(#) $Id: HTBufWrt.c,v 2.10 1997/01/23 19:49:51 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:
2.7 frystyk 33: ms_t lastFlushTime; /* polar coordinates of the moon */
2.6 frystyk 34: HTTimer * timer;
2.1 frystyk 35: };
36:
37: #define PUTBLOCK(b,l) (*me->target->isa->put_block)(me->target,(b),(l))
38:
39: /* ------------------------------------------------------------------------- */
40:
2.11 ! frystyk 41: /*
! 42: ** This function is only called from either FlushEvent or HTBufferWriter_lazyFlush
! 43: ** which means that only the host object or timeout can cause a flush
! 44: */
2.1 frystyk 45: PRIVATE int HTBufferWriter_flush (HTOutputStream * me)
46: {
2.11 ! frystyk 47: int status = HT_ERROR;
! 48: if (me && me->read > me->data) {
2.1 frystyk 49: if ((status = PUTBLOCK(me->data, me->read - me->data))==HT_WOULD_BLOCK)
50: return HT_WOULD_BLOCK;
2.6 frystyk 51: me->lastFlushTime = HTGetTimeInMillis();
2.1 frystyk 52: me->read = me->data;
53: me->block = NULL;
54: }
55: return status;
56: }
57:
2.9 eric 58: PRIVATE int FlushEvent (HTTimer * timer, void * param, HTEventType type)
2.6 frystyk 59: {
60: HTOutputStream * me = (HTOutputStream *) param;
61: if (timer != me->timer) HTDebugBreak();
2.11 ! frystyk 62: if (PROT_TRACE) HTTrace("Buffer...... Timeout Flushing...\n");
! 63:
! 64: /*
! 65: ** We ignore the return code here which we shouldn't!!!
! 66: */
2.6 frystyk 67: HTBufferWriter_flush(me);
2.11 ! frystyk 68:
! 69: /*
! 70: ** Delete the timer
! 71: */
! 72: HTTimer_delete(me->timer);
! 73: me->timer = NULL;
2.6 frystyk 74: return HT_OK;
75: }
76:
77: PRIVATE int HTBufferWriter_lazyFlush (HTOutputStream * me)
78: {
79: HTNet * net;
80: int delay;
81:
82: if (me->read <= me->data)
83: return HT_OK; /* nothing to flush */
84: /*
85: ** If we are allowed to delay the flush then set a timer with the
86: ** delay descibed by our delay variable. If we can't delay then flush
87: ** right away.
88: */
89: delay = HTHost_writeDelay(me->host, me->lastFlushTime, me->read - me->data);
90:
91: /*
92: ** Flush immediately
93: */
2.11 ! frystyk 94: if (!delay) {
! 95: int status;
! 96: if (PROT_TRACE) HTTrace("Buffer...... Flushing\n");
! 97: if ((status = HTBufferWriter_flush(me)) && me->timer) {
! 98: HTTimer_delete(me->timer);
! 99: me->timer = NULL;
! 100: }
! 101: return status;
! 102: }
2.6 frystyk 103:
104: /*
2.11 ! frystyk 105: ** Set a timer and tell the host we've done the write if
! 106: ** we have not already started a timer earlier.
2.6 frystyk 107: */
2.11 ! frystyk 108: if (!me->timer) {
! 109: net = HTHost_getWriteNet(me->host);
! 110: me->timer = HTTimer_new(NULL, FlushEvent, me, delay, YES);
! 111: HTHost_unregister(me->host, net, HTEvent_WRITE);
! 112: if (PROT_TRACE) HTTrace("Buffer...... Waiting...\n");
! 113: }
2.6 frystyk 114: return HT_OK;
115: }
116:
2.1 frystyk 117: PRIVATE int HTBufferWriter_free (HTOutputStream * me)
118: {
2.11 ! frystyk 119: return HTBufferWriter_lazyFlush(me);
2.1 frystyk 120: }
121:
122: PRIVATE int HTBufferWriter_abort (HTOutputStream * me, HTList * e)
123: {
2.8 frystyk 124: if (PROT_TRACE) HTTrace("Buffer...... ABORTING...\n");
2.1 frystyk 125: if (me->target) (*me->target->isa->abort)(me->target, e);
2.8 frystyk 126: if (me->timer) {
127: HTTimer_delete(me->timer);
128: me->timer = NULL;
129: }
2.1 frystyk 130: return HT_ERROR;
131: }
132:
2.6 frystyk 133: PRIVATE int HTBufferWriter_write (HTOutputStream * me, const char * buf, int len)
2.1 frystyk 134: {
2.6 frystyk 135: HTNet * net = HTHost_getWriteNet(me->host);
2.4 frystyk 136: long total = len;
2.1 frystyk 137: int status;
2.4 frystyk 138:
2.3 frystyk 139: if (me->bb > 0) {
2.1 frystyk 140: len -= (me->block - buf);
2.3 frystyk 141: if ((status = PUTBLOCK(me->block, me->bb)) != HT_OK) return status;
2.6 frystyk 142: me->lastFlushTime = HTGetTimeInMillis();
2.3 frystyk 143: me->block += me->bb;
144: len -= me->bb;
145: me->bb = 0;
146: } else {
147: int available = me->data + me->size - me->read;
148:
149: /* Still room in buffer */
150: if (len <= available) {
151: memcpy(me->read, buf, len);
152: me->read += len;
153: return HT_OK;
154: }
155:
156: /* If already data in buffer then fill it and flush */
157: if (me->read > me->data) {
158: memcpy(me->read, buf, available);
159: me->block = (char *) buf+available;
2.4 frystyk 160: if ((status = PUTBLOCK(me->data, me->size))!=HT_OK) return status;
2.6 frystyk 161: me->lastFlushTime = HTGetTimeInMillis();
2.3 frystyk 162: }
163:
164: /* If more data then write n times buffer size */
165: if (!me->block)
166: me->block = (char *) buf;
167: else {
168: len -= (me->block - buf);
169: }
170: me->bb = len - len%me->size;
2.6 frystyk 171: if (me->bb) {
172: if ((status = PUTBLOCK(me->block, me->bb)) != HT_OK) return status;
173: me->lastFlushTime = HTGetTimeInMillis();
174: }
2.3 frystyk 175: me->block += me->bb;
176: len -= me->bb;
177: me->bb = 0;
2.1 frystyk 178: }
179:
180: /* If data is not aligned then save the rest in our buffer */
181: if (len > 0) {
182: memcpy(me->data, me->block, len);
183: me->read = me->data + len;
2.11 ! frystyk 184: if (PROT_TRACE) HTTrace("Buffer...... Carrying %d bytes over...\n", len);
! 185: #if 0
! 186: if ((status = HTBufferWriter_lazyFlush(me)) != HT_OK) return status;
! 187: #endif
2.1 frystyk 188: } else
189: me->read = me->data;
190: me->block = NULL;
2.6 frystyk 191: HTNet_addBytesWritten(net, total);
2.1 frystyk 192: return HT_OK;
193: }
194:
195: /* Character handling
196: ** ------------------
197: */
198: PRIVATE int HTBufferWriter_put_character (HTOutputStream * me, char c)
199: {
200: return HTBufferWriter_write(me, &c, 1);
201: }
202:
203: /* String handling
204: ** ---------------
205: **
206: ** Strings must be smaller than this buffer size.
207: */
208: PRIVATE int HTBufferWriter_put_string (HTOutputStream * me, const char * s)
209: {
210: return HTBufferWriter_write(me, s, (int) strlen(s));
211: }
212: /*
213: ** The difference between the close and the free method is that we don't
214: ** close the connection in the free method - we only call the free method
215: ** of the target stream. That way, we can keep the output stream as long
216: ** as the channel itself.
217: */
218: PRIVATE int HTBufferWriter_close (HTOutputStream * me)
219: {
220: if (me) {
2.10 frystyk 221: #if 0
222: /*
223: ** The channel has been closed so we shouldn't do any more on
224: ** it at all
225: */
2.1 frystyk 226: HTBufferWriter_flush(me);
2.10 frystyk 227: #endif
2.1 frystyk 228: if (me->target) (*me->target->isa->close)(me->target);
229: HT_FREE(me->data);
230: HT_FREE(me);
231: }
232: return HT_OK;
233: }
234:
235: PRIVATE const HTOutputStreamClass HTBufferWriter =
236: {
2.6 frystyk 237: "BufferedSocketWriter",
238: HTBufferWriter_lazyFlush,
2.1 frystyk 239: HTBufferWriter_free,
240: HTBufferWriter_abort,
241: HTBufferWriter_put_character,
242: HTBufferWriter_put_string,
243: HTBufferWriter_write,
244: HTBufferWriter_close
245: };
246:
2.6 frystyk 247: PUBLIC HTOutputStream * HTBufferWriter_new (HTHost * host, HTChannel * ch,
2.1 frystyk 248: void * param, int bufsize)
249: {
2.6 frystyk 250: if (host && ch) {
2.1 frystyk 251: HTOutputStream * me = HTChannel_output(ch);
2.6 frystyk 252: if (!me) {
253: HTOutputStream * me;
2.1 frystyk 254: if (bufsize <= 0) bufsize = OUTPUT_BUFFER_SIZE;
2.6 frystyk 255: if ((me = (HTOutputStream *) HT_CALLOC(1, sizeof(HTOutputStream)))==NULL ||
2.1 frystyk 256: (me->data = (char *) HT_MALLOC(bufsize)) == NULL)
257: HT_OUTOFMEM("HTBufferWriter_new");
258: me->isa = &HTBufferWriter;
259: me->read = me->data;
260: me->size = bufsize;
2.6 frystyk 261: me->target = HTWriter_new(host, ch, param, 0);
262: me->host = host;
263: return me;
264: }
2.1 frystyk 265: }
266: return NULL;
267: }
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