Annotation of libwww/Library/src/HTFormat.c, revision 1.90
1.55 frystyk 1: /* HTFormat.c
2: ** MANAGE DIFFERENT FILE FORMATS
3: **
1.62 frystyk 4: ** (c) COPYRIGHT MIT 1995.
1.55 frystyk 5: ** Please first read the full copyright statement in the file COPYRIGH.
1.90 ! frystyk 6: ** @(#) $Id: HTFormat.c,v 1.89 1996/06/03 19:25:11 eric Exp $
1.1 timbl 7: **
8: ** Bugs:
9: ** Assumes the incoming stream is ASCII, rather than a local file
10: ** format, and so ALWAYS converts from ASCII on non-ASCII machines.
11: ** Therefore, non-ASCII machines can't read local files.
1.2 timbl 12: **
1.45 duns 13: ** HISTORY:
1.86 frystyk 14: ** 8 Jul 94 FM Insulate free from _free structure element.
1.52 frystyk 15: ** 8 Nov 94 HFN Changed a lot to make reentrant
1.2 timbl 16: */
17:
1.58 frystyk 18: /* Library Include files */
1.85 frystyk 19: #include "sysdep.h"
1.87 frystyk 20: #include "WWWUtil.h"
21: #include "HTStream.h"
1.58 frystyk 22: #include "HTFWrite.h"
1.52 frystyk 23: #include "HTError.h"
24: #include "HTFormat.h" /* Implemented here */
1.2 timbl 25:
1.72 frystyk 26: #define NO_VALUE_FOUND -1e30 /* Stream Stack Value if none found */
1.63 frystyk 27:
1.87 frystyk 28: PRIVATE HTList * HTConversions = NULL; /* Content types */
1.88 frystyk 29: PRIVATE HTList * HTContentCoders = NULL; /* Content coders */
30: PRIVATE HTList * HTTransferCoders = NULL; /* Content transfer coders */
1.72 frystyk 31: PRIVATE HTList * HTCharsets = NULL;
32: PRIVATE HTList * HTLanguages = NULL;
1.63 frystyk 33:
34: PRIVATE double HTMaxSecs = 1e10; /* No effective limit */
1.17 luotonen 35:
1.60 frystyk 36: struct _HTStream {
1.85 frystyk 37: const HTStreamClass * isa;
1.60 frystyk 38: };
39:
1.88 frystyk 40: struct _HTCoding {
41: HTEncoding encoding;
42: HTCoder * encoder;
43: HTCoder * decoder;
1.87 frystyk 44: double quality;
45: };
46:
1.52 frystyk 47: /* ------------------------------------------------------------------------- */
1.87 frystyk 48: /* BASIC CONVERTERS */
49: /* ------------------------------------------------------------------------- */
50:
51: PUBLIC HTStream * HTBlackHoleConverter (HTRequest * request,
52: void * param,
53: HTFormat input_format,
54: HTFormat output_format,
55: HTStream * output_stream)
56: {
57: return HTBlackHole();
58: }
59: /* HTThroughLine
60: ** -------------
61: **
62: ** This function is a dummy function that returns the same output stream
63: ** as given as a parameter. Henrik 01/03-94
64: */
65: PUBLIC HTStream* HTThroughLine (HTRequest * request,
66: void * param,
67: HTFormat input_format,
68: HTFormat output_format,
69: HTStream * output_stream)
70: {
71: return output_stream;
72: }
73:
1.52 frystyk 74: /*
1.63 frystyk 75: ** For all `accept lists' there is a local list and a global list. The
76: ** local list is a part of the request structure and the global list is
77: ** internal to the HTFormat module. The global lists can be used when
78: ** specifying accept lists for ALL requests and the local list can be
79: ** used to add specific accept headers to the request.
80: */
81:
1.88 frystyk 82: /* ------------------------------------------------------------------------- */
83: /* CONTENT TYPES */
84: /* ------------------------------------------------------------------------- */
1.61 frystyk 85:
1.2 timbl 86: /* Define a presentation system command for a content-type
87: ** -------------------------------------------------------
1.52 frystyk 88: ** INPUT:
89: ** conversions: The list of conveters and presenters
90: ** representation: the MIME-style format name
91: ** command: the MAILCAP-style command template
92: ** quality: A degradation faction [0..1]
93: ** maxbytes: A limit on the length acceptable as input (0 infinite)
94: ** maxsecs: A limit on the time user will wait (0 for infinity)
1.2 timbl 95: */
1.72 frystyk 96: PUBLIC void HTPresentation_add (HTList * conversions,
1.85 frystyk 97: const char * representation,
98: const char * command,
99: const char * test_command,
1.72 frystyk 100: double quality,
101: double secs,
102: double secs_per_byte)
1.52 frystyk 103: {
1.83 frystyk 104: HTPresentation * pres;
105: if ((pres = (HTPresentation *) HT_CALLOC(1,sizeof(HTPresentation))) == NULL)
106: HT_OUTOFMEM("HTSetPresentation");
1.2 timbl 107:
108: pres->rep = HTAtom_for(representation);
109: pres->rep_out = WWW_PRESENT; /* Fixed for now ... :-) */
110: pres->converter = HTSaveAndExecute; /* Fixed for now ... */
111: pres->quality = quality;
112: pres->secs = secs;
113: pres->secs_per_byte = secs_per_byte;
114: pres->rep = HTAtom_for(representation);
1.49 howcome 115: pres->command = NULL;
1.2 timbl 116: StrAllocCopy(pres->command, command);
1.49 howcome 117: pres->test_command = NULL;
118: StrAllocCopy(pres->test_command, test_command);
1.12 timbl 119: HTList_addObject(conversions, pres);
1.2 timbl 120: }
121:
1.73 frystyk 122: PUBLIC void HTPresentation_deleteAll (HTList * list)
123: {
124: if (list) {
125: HTList *cur = list;
126: HTPresentation *pres;
127: while ((pres = (HTPresentation*) HTList_nextObject(cur))) {
1.83 frystyk 128: HT_FREE(pres->command);
129: HT_FREE(pres);
1.73 frystyk 130: }
131: HTList_delete(list);
132: }
133: }
1.2 timbl 134:
135: /* Define a built-in function for a content-type
136: ** ---------------------------------------------
137: */
1.72 frystyk 138: PUBLIC void HTConversion_add (HTList * conversions,
1.85 frystyk 139: const char * representation_in,
140: const char * representation_out,
1.72 frystyk 141: HTConverter * converter,
142: double quality,
143: double secs,
144: double secs_per_byte)
1.52 frystyk 145: {
1.83 frystyk 146: HTPresentation * pres;
1.87 frystyk 147: if ((pres = (HTPresentation*) HT_CALLOC(1,sizeof(HTPresentation))) == NULL)
1.83 frystyk 148: HT_OUTOFMEM("HTSetPresentation");
1.2 timbl 149: pres->rep = HTAtom_for(representation_in);
150: pres->rep_out = HTAtom_for(representation_out);
151: pres->converter = converter;
152: pres->command = NULL; /* Fixed */
1.49 howcome 153: pres->test_command = NULL;
1.2 timbl 154: pres->quality = quality;
155: pres->secs = secs;
156: pres->secs_per_byte = secs_per_byte;
1.12 timbl 157: HTList_addObject(conversions, pres);
1.56 frystyk 158: }
159:
1.73 frystyk 160: PUBLIC void HTConversion_deleteAll (HTList * list)
161: {
162: HTPresentation_deleteAll(list);
163: }
164:
1.88 frystyk 165: /* ------------------------------------------------------------------------- */
166: /* CONTENT ENCODING AND CONTENT TRANSFER ENCODING */
167: /* ------------------------------------------------------------------------- */
168:
169: PUBLIC BOOL HTCoding_add (HTList * list,
170: const char * encoding,
171: HTCoder * encoder,
172: HTCoder * decoder,
173: double quality)
1.73 frystyk 174: {
1.88 frystyk 175: if (list && encoding && (encoder || decoder)) {
176: HTCoding * me;
177: if ((me = (HTCoding *) HT_CALLOC(1, sizeof(HTCoding))) == NULL)
178: HT_OUTOFMEM("HTCoding_add");
179: me->encoding = HTAtom_for(encoding);
1.87 frystyk 180: me->encoder = encoder;
181: me->decoder = decoder;
182: me->quality = quality;
183: if (CORE_TRACE)
184: HTTrace("Codings..... Adding %s with quality %.2f\n",
1.88 frystyk 185: encoding, quality);
1.87 frystyk 186: return HTList_addObject(list, (void *) me);
1.73 frystyk 187: }
1.87 frystyk 188: if (CORE_TRACE) HTTrace("Codings..... Bad argument\n");
189: return NO;
1.73 frystyk 190: }
191:
1.88 frystyk 192: PUBLIC void HTCoding_deleteAll (HTList * list)
1.73 frystyk 193: {
194: if (list) {
1.87 frystyk 195: HTList * cur = list;
1.88 frystyk 196: HTCoding * pres;
197: while ((pres = (HTCoding *) HTList_nextObject(cur)))
1.83 frystyk 198: HT_FREE(pres);
1.73 frystyk 199: HTList_delete(list);
200: }
201: }
202:
1.88 frystyk 203: PUBLIC const char * HTCoding_name (HTCoding * me)
1.87 frystyk 204: {
1.88 frystyk 205: return me ? HTAtom_name(me->encoding) : NULL;
1.87 frystyk 206: }
207:
1.88 frystyk 208: /* ------------------------------------------------------------------------- */
209: /* CONTENT LANGUAGE */
210: /* ------------------------------------------------------------------------- */
211:
1.73 frystyk 212: PUBLIC void HTLanguage_add (HTList * list,
1.85 frystyk 213: const char * lang,
1.73 frystyk 214: double quality)
215: {
216: HTAcceptNode * node;
217: if (!list || !lang || !*lang) {
1.87 frystyk 218: if (CORE_TRACE)
1.84 eric 219: HTTrace("Languages... Bad argument\n");
1.73 frystyk 220: return;
221: }
1.83 frystyk 222: if ((node = (HTAcceptNode *) HT_CALLOC(1, sizeof(HTAcceptNode))) == NULL)
223: HT_OUTOFMEM("HTAcceptLanguage");
1.73 frystyk 224:
225: HTList_addObject(list, (void*)node);
226: node->atom = HTAtom_for(lang);
227: node->quality = quality;
228: }
229:
230: PUBLIC void HTLanguage_deleteAll (HTList * list)
231: {
1.87 frystyk 232: if (list) {
233: HTList *cur = list;
234: HTAcceptNode *pres;
235: while ((pres = (HTAcceptNode *) HTList_nextObject(cur))) {
236: HT_FREE(pres);
237: }
238: HTList_delete(list);
239: }
1.73 frystyk 240: }
241:
1.88 frystyk 242: /* ------------------------------------------------------------------------- */
243: /* CONTENT CHARSET */
244: /* ------------------------------------------------------------------------- */
245:
1.73 frystyk 246: PUBLIC void HTCharset_add (HTList * list,
1.85 frystyk 247: const char * charset,
1.73 frystyk 248: double quality)
249: {
250: HTAcceptNode * node;
251: if (!list || !charset || !*charset) {
1.87 frystyk 252: if (CORE_TRACE)
1.84 eric 253: HTTrace("Charset..... Bad argument\n");
1.73 frystyk 254: return;
255: }
1.83 frystyk 256: if ((node = (HTAcceptNode *) HT_CALLOC(1, sizeof(HTAcceptNode))) == NULL)
257: HT_OUTOFMEM("HTAcceptCharsetuage");
1.73 frystyk 258:
259: HTList_addObject(list, (void*)node);
260: node->atom = HTAtom_for(charset);
261: node->quality = quality;
262: }
263:
264: PUBLIC void HTCharset_deleteAll (HTList * list)
265: {
1.87 frystyk 266: if (list) {
267: HTList *cur = list;
268: HTAcceptNode *pres;
269: while ((pres = (HTAcceptNode *) HTList_nextObject(cur))) {
270: HT_FREE(pres);
271: }
272: HTList_delete(list);
273: }
1.73 frystyk 274: }
275:
276: /* ------------------------------------------------------------------------- */
277: /* GLOBAL LIST OF CONVERTERS ETC. */
278: /* ------------------------------------------------------------------------- */
279:
1.72 frystyk 280: /*
281: ** Global Accept Format Types Conversions
282: ** list can be NULL
283: */
1.73 frystyk 284: PUBLIC void HTFormat_setConversion (HTList * list)
1.72 frystyk 285: {
286: HTConversions = list;
287: }
288:
289: PUBLIC HTList * HTFormat_conversion (void)
290: {
291: return HTConversions;
292: }
293:
294: /*
1.88 frystyk 295: ** Global list of Content Encodings
1.72 frystyk 296: ** list can be NULL
297: */
1.88 frystyk 298: PUBLIC void HTFormat_setContentCoding (HTList *list)
1.72 frystyk 299: {
1.88 frystyk 300: HTContentCoders = list;
1.72 frystyk 301: }
302:
1.88 frystyk 303: PUBLIC HTList * HTFormat_contentCoding (void)
1.72 frystyk 304: {
1.88 frystyk 305: return HTContentCoders;
1.72 frystyk 306: }
307:
308: /*
1.88 frystyk 309: ** Global list of Content Transfer Encodings
310: ** list can be NULL
311: */
312: PUBLIC void HTFormat_setTransferCoding (HTList *list)
313: {
314: HTTransferCoders = list;
315: }
316:
317: PUBLIC HTList * HTFormat_transferCoding (void)
318: {
319: return HTTransferCoders;
320: }
321:
322: /*
1.72 frystyk 323: ** Global Accept Languages
324: ** list can be NULL
325: */
326: PUBLIC void HTFormat_setLanguage (HTList *list)
327: {
328: HTLanguages = list;
329: }
330:
331: PUBLIC HTList * HTFormat_language (void)
332: {
333: return HTLanguages;
334: }
335:
336: /*
337: ** Global Accept Charsets
338: ** list can be NULL
339: */
340: PUBLIC void HTFormat_setCharset (HTList *list)
341: {
342: HTCharsets = list;
343: }
344:
345: PUBLIC HTList * HTFormat_charset (void)
346: {
347: return HTCharsets;
348: }
1.56 frystyk 349:
1.73 frystyk 350: /*
351: ** Convenience function to clean up
352: */
353: PUBLIC void HTFormat_deleteAll (void)
1.17 luotonen 354: {
1.73 frystyk 355: if (HTConversions) {
356: HTConversion_deleteAll(HTConversions);
357: HTConversions = NULL;
358: }
359: if (HTLanguages) {
360: HTLanguage_deleteAll(HTLanguages);
361: HTLanguages = NULL;
1.63 frystyk 362: }
1.88 frystyk 363: if (HTContentCoders) {
364: HTCoding_deleteAll(HTContentCoders);
365: HTContentCoders = NULL;
1.63 frystyk 366: }
1.88 frystyk 367: if (HTTransferCoders) {
368: HTCoding_deleteAll(HTTransferCoders);
369: HTTransferCoders = NULL;
370: }
1.73 frystyk 371: if (HTCharsets) {
372: HTCharset_deleteAll(HTCharsets);
373: HTCharsets = NULL;
1.63 frystyk 374: }
1.17 luotonen 375: }
376:
1.63 frystyk 377: /* ------------------------------------------------------------------------- */
1.90 ! frystyk 378: /* STREAM STACKS */
1.63 frystyk 379: /* ------------------------------------------------------------------------- */
380:
1.77 frystyk 381: PRIVATE BOOL better_match (HTFormat f, HTFormat g)
1.63 frystyk 382: {
1.85 frystyk 383: const char *p, *q;
1.63 frystyk 384:
385: if (f && g && (p = HTAtom_name(f)) && (q = HTAtom_name(g))) {
386: int i,j;
387: for(i=0 ; *p; p++) if (*p == '*') i++;
388: for(j=0 ; *q; q++) if (*q == '*') j++;
389: if (i < j) return YES;
390: }
391: return NO;
392: }
393:
394:
1.77 frystyk 395: PRIVATE BOOL wild_match (HTAtom * tmplate, HTAtom * actual)
1.17 luotonen 396: {
1.89 eric 397: const char *t, *a;
398: char *st, *sa;
1.17 luotonen 399: BOOL match = NO;
400:
1.48 frystyk 401: if (tmplate && actual && (t = HTAtom_name(tmplate))) {
1.22 luotonen 402: if (!strcmp(t, "*"))
403: return YES;
1.17 luotonen 404:
1.22 luotonen 405: if (strchr(t, '*') &&
406: (a = HTAtom_name(actual)) &&
407: (st = strchr(t, '/')) && (sa = strchr(a,'/'))) {
1.17 luotonen 408:
1.22 luotonen 409: *sa = 0;
410: *st = 0;
411:
412: if ((*(st-1)=='*' &&
413: (*(st+1)=='*' || !strcasecomp(st+1, sa+1))) ||
414: (*(st+1)=='*' && !strcasecomp(t,a)))
415: match = YES;
416:
417: *sa = '/';
418: *st = '/';
419: }
420: }
1.23 luotonen 421: return match;
1.17 luotonen 422: }
423:
1.87 frystyk 424: /* Create a Content Type filter stack
425: ** ----------------------------------
1.7 secret 426: ** If a wildcard match is made, a temporary HTPresentation
1.2 timbl 427: ** structure is made to hold the destination format while the
428: ** new stack is generated. This is just to pass the out format to
429: ** MIME so far. Storing the format of a stream in the stream might
430: ** be a lot neater.
1.10 timbl 431: **
1.29 frystyk 432: ** The star/star format is special, in that if you can take
1.40 frystyk 433: ** that you can take anything.
1.2 timbl 434: */
1.77 frystyk 435: PUBLIC HTStream * HTStreamStack (HTFormat rep_in,
436: HTFormat rep_out,
437: HTStream * output_stream,
438: HTRequest * request,
439: BOOL guess)
1.2 timbl 440: {
1.14 timbl 441: HTList * conversion[2];
442: int which_list;
1.59 frystyk 443: double best_quality = -1e30; /* Pretty bad! */
1.65 frystyk 444: HTPresentation *pres, *best_match=NULL;
1.80 frystyk 445: if (rep_out == WWW_RAW) {
1.87 frystyk 446: if (CORE_TRACE) HTTrace("StreamStack. Raw output...\n");
1.81 frystyk 447: return output_stream ? output_stream : HTErrorStream();
1.34 luotonen 448: }
1.79 frystyk 449:
1.80 frystyk 450: if (rep_out == rep_in) {
1.87 frystyk 451: if (CORE_TRACE)
1.84 eric 452: HTTrace("StreamStack. Identical input/output format (%s)\n",
1.80 frystyk 453: HTAtom_name(rep_out));
1.81 frystyk 454: return output_stream ? output_stream : HTErrorStream();
1.74 frystyk 455: }
1.87 frystyk 456: if (CORE_TRACE) {
1.89 eric 457: const char *p = HTAtom_name(rep_in);
458: const char *q = HTAtom_name(rep_out);
1.84 eric 459: HTTrace("StreamStack. Constructing stream stack for %s to %s\n",
1.82 frystyk 460: p ? p : "<NULL>", q ? q : "<NULL>");
1.47 frystyk 461: }
1.2 timbl 462:
1.88 frystyk 463: conversion[0] = HTRequest_conversion(request);
1.14 timbl 464: conversion[1] = HTConversions;
1.17 luotonen 465:
1.15 luotonen 466: for(which_list = 0; which_list<2; which_list++) {
467: HTList * cur = conversion[which_list];
468: while ((pres = (HTPresentation*)HTList_nextObject(cur))) {
1.65 frystyk 469: if ((pres->rep==rep_in || wild_match(pres->rep, rep_in)) &&
470: (pres->rep_out==rep_out || wild_match(pres->rep_out,rep_out))){
471: if (!best_match || better_match(pres->rep, best_match->rep) ||
1.33 luotonen 472: (!better_match(best_match->rep, pres->rep) &&
473: pres->quality > best_quality)) {
1.85 frystyk 474: #ifdef HAVE_SYSTEM
1.65 frystyk 475: int result=0;
476: if (pres->test_command) {
477: result = system(pres->test_command);
1.87 frystyk 478: if (CORE_TRACE)
1.84 eric 479: HTTrace("StreamStack. system(%s) returns %d\n", pres->test_command, result);
1.65 frystyk 480: }
481: if (!result) {
1.49 howcome 482: best_match = pres;
483: best_quality = pres->quality;
484: }
1.65 frystyk 485: #else
486: best_match = pres;
487: best_quality = pres->quality;
1.85 frystyk 488: #endif /* HAVE_SYSTEM */
1.10 timbl 489: }
490: }
1.2 timbl 491: }
492: }
1.80 frystyk 493:
494: if (best_match) {
495: if (rep_out == WWW_SOURCE && best_match->rep_out != WWW_SOURCE) {
1.87 frystyk 496: if (CORE_TRACE) HTTrace("StreamStack. Source output\n");
1.81 frystyk 497: return output_stream ? output_stream : HTErrorStream();
1.80 frystyk 498: }
1.65 frystyk 499: return (*best_match->converter)(request, best_match->command,
500: rep_in, rep_out, output_stream);
1.80 frystyk 501: }
502: if (rep_out == WWW_SOURCE) {
1.87 frystyk 503: if (CORE_TRACE) HTTrace("StreamStack. Source output\n");
1.81 frystyk 504: return output_stream ? output_stream : HTErrorStream();
1.80 frystyk 505: }
506:
1.87 frystyk 507: if (CORE_TRACE)
1.84 eric 508: HTTrace("StreamStack. No match found, dumping to local file\n");
1.65 frystyk 509: return HTSaveLocally(request, NULL, rep_in, rep_out, output_stream);
1.2 timbl 510: }
511:
512:
513: /* Find the cost of a filter stack
514: ** -------------------------------
515: **
516: ** Must return the cost of the same stack which StreamStack would set up.
517: **
518: ** On entry,
519: ** length The size of the data to be converted
520: */
1.77 frystyk 521: PUBLIC double HTStackValue (HTList * theseConversions,
522: HTFormat rep_in,
523: HTFormat rep_out,
524: double initial_value,
525: long int length)
1.2 timbl 526: {
1.14 timbl 527: int which_list;
528: HTList* conversion[2];
529:
1.87 frystyk 530: if (CORE_TRACE) {
1.84 eric 531: HTTrace("StackValue.. Evaluating stream stack for %s worth %.3f to %s\n",
1.65 frystyk 532: HTAtom_name(rep_in), initial_value,
533: HTAtom_name(rep_out));
534: }
1.2 timbl 535: if (rep_out == WWW_SOURCE ||
1.10 timbl 536: rep_out == rep_in) return 0.0;
1.2 timbl 537:
1.14 timbl 538: conversion[0] = theseConversions;
539: conversion[1] = HTConversions;
540:
541: for(which_list = 0; which_list<2; which_list++)
542: if (conversion[which_list]) {
1.15 luotonen 543: HTList * cur = conversion[which_list];
1.2 timbl 544: HTPresentation * pres;
1.15 luotonen 545: while ((pres = (HTPresentation*)HTList_nextObject(cur))) {
546: if (pres->rep == rep_in &&
1.17 luotonen 547: (pres->rep_out == rep_out || wild_match(pres->rep_out, rep_out))) {
1.59 frystyk 548: double value = initial_value * pres->quality;
1.2 timbl 549: if (HTMaxSecs != 0.0)
1.15 luotonen 550: value = value - (length*pres->secs_per_byte + pres->secs)
1.2 timbl 551: /HTMaxSecs;
552: return value;
553: }
554: }
555: }
1.63 frystyk 556: return NO_VALUE_FOUND; /* Really bad */
1.1 timbl 557: }
1.2 timbl 558:
1.87 frystyk 559: /* Create a new coder and insert it into stream chain
560: ** --------------------------------------------------
561: ** Creating the content decoding stack is not based on quality factors as
562: ** we don't have the freedom as with content types. Specify whether you
1.88 frystyk 563: ** you want encoding or decoding using the BOOL "encode" flag.
1.87 frystyk 564: */
1.88 frystyk 565: PUBLIC HTStream * HTContentCodingStack (HTEncoding encoding,
566: HTStream * target,
567: HTRequest * request,
568: void * param,
569: BOOL encode)
1.87 frystyk 570: {
571: HTList * coders[2];
572: HTStream * top = target;
1.88 frystyk 573: HTCoding * pres = NULL;
1.87 frystyk 574: int cnt;
1.88 frystyk 575: if (!encoding || !request) {
1.87 frystyk 576: if (CORE_TRACE) HTTrace("Codings... Nothing applied...\n");
577: return target ? target : HTErrorStream();
578: }
1.88 frystyk 579: coders[0] = HTRequest_encoding(request);
580: coders[1] = HTContentCoders;
1.87 frystyk 581: if (CORE_TRACE)
1.88 frystyk 582: HTTrace("Codings..... Looking for %s\n", HTAtom_name(encoding));
1.87 frystyk 583: for (cnt=0; cnt < 2; cnt++) {
584: HTList * cur = coders[cnt];
1.88 frystyk 585: while ((pres = (HTCoding *) HTList_nextObject(cur))) {
586: if (pres->encoding == encoding) {
1.87 frystyk 587: if (CORE_TRACE) HTTrace("Codings..... Found...\n");
1.88 frystyk 588: if (encode) {
1.87 frystyk 589: if (pres->encoder)
1.88 frystyk 590: top = (*pres->encoder)(request, param, encoding, top);
1.87 frystyk 591: break;
592: } else if (pres->decoder) {
1.88 frystyk 593: top = (*pres->decoder)(request, param, encoding, top);
1.87 frystyk 594: break;
595: }
596: }
597: }
598: }
599: return top;
600: }
1.10 timbl 601:
1.87 frystyk 602: /*
603: ** Here you can provide a complete list instead of a single token.
604: ** The list has to filled up in the order the _encodings_ are to be applied
605: */
1.88 frystyk 606: PUBLIC HTStream * HTContentEncodingStack (HTList * encodings,
607: HTStream * target,
608: HTRequest * request,
609: void * param)
1.87 frystyk 610: {
611: if (encodings) {
612: HTList * cur = encodings;
613: HTEncoding pres;
614: HTStream * top = target;
615: while ((pres = (HTEncoding) HTList_nextObject(cur)))
1.88 frystyk 616: top = HTContentCodingStack(pres, top, request, param, YES);
1.87 frystyk 617: return top;
618: }
619: return HTErrorStream();
620: }
621:
622: /*
623: ** Here you can provide a complete list instead of a single token.
624: ** The list has to be in the order the _encodings_ were applied - that
625: ** is, the same way that _encodings_ are to be applied. This is all consistent
626: ** with the order of the Content-Encoding header.
627: */
1.88 frystyk 628: PUBLIC HTStream * HTContentDecodingStack (HTList * encodings,
629: HTStream * target,
630: HTRequest * request,
631: void * param)
1.87 frystyk 632: {
633: if (encodings) {
634: HTEncoding pres;
635: int cnt = HTList_count(encodings);
636: HTStream * top = target;
637: while (cnt > 0) {
638: pres = (HTEncoding) HTList_objectAt(encodings, --cnt);
1.88 frystyk 639: top = HTContentCodingStack(pres, top, request, param, NO);
1.87 frystyk 640: }
641: return top;
642: }
643: return HTErrorStream();
644: }
1.88 frystyk 645:
646: /* Create a new transfer coder and insert it into stream chain
647: ** -----------------------------------------------------------
648: ** Creating the content decoding stack is not based on quality factors as
649: ** we don't have the freedom as with content types. Specify whether you
650: ** you want encoding or decoding using the BOOL "encode" flag.
651: */
652: PUBLIC HTStream * HTTransferCodingStack (HTEncoding encoding,
653: HTStream * target,
654: HTRequest * request,
655: void * param,
656: BOOL encode)
657: {
658: HTList * coders[2];
659: HTStream * top = target;
660: HTCoding * pres = NULL;
661: int cnt;
662: if (!encoding || !request) {
663: if (CORE_TRACE) HTTrace("C-T-E..... Nothing applied...\n");
664: return target ? target : HTErrorStream();
665: }
666: coders[0] = HTRequest_transfer(request);
667: coders[1] = HTTransferCoders;
668: if (CORE_TRACE)
669: HTTrace("C-T-E....... Looking for %s\n", HTAtom_name(encoding));
670: for (cnt=0; cnt < 2; cnt++) {
671: HTList * cur = coders[cnt];
672: while ((pres = (HTCoding *) HTList_nextObject(cur))) {
673: if (pres->encoding == encoding) {
674: if (CORE_TRACE) HTTrace("C-T-E....... Found...\n");
675: if (encode) {
676: if (pres->encoder)
677: top = (*pres->encoder)(request, param, encoding, top);
678: break;
679: } else if (pres->decoder) {
680: top = (*pres->decoder)(request, param, encoding, top);
681: break;
682: }
683: }
684: }
685: }
686: return top;
687: }
688:
Webmaster
![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to HTFormat.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Public] / libwww / Library / src