Annotation of libwww/Library/src/HTFormat.c, revision 1.93
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.
1.93 ! frystyk 6: ** @(#) $Id: HTFormat.c,v 1.92 1996/07/16 02:26:53 frystyk 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"
1.93 ! frystyk 22: #include "HTWWWStr.h"
1.58 frystyk 23: #include "HTFWrite.h"
1.52 frystyk 24: #include "HTError.h"
25: #include "HTFormat.h" /* Implemented here */
1.2 timbl 26:
1.72 frystyk 27: #define NO_VALUE_FOUND -1e30 /* Stream Stack Value if none found */
1.63 frystyk 28:
1.87 frystyk 29: PRIVATE HTList * HTConversions = NULL; /* Content types */
1.88 frystyk 30: PRIVATE HTList * HTContentCoders = NULL; /* Content coders */
31: PRIVATE HTList * HTTransferCoders = NULL; /* Content transfer coders */
1.72 frystyk 32: PRIVATE HTList * HTCharsets = NULL;
33: PRIVATE HTList * HTLanguages = NULL;
1.63 frystyk 34:
35: PRIVATE double HTMaxSecs = 1e10; /* No effective limit */
1.17 luotonen 36:
1.60 frystyk 37: struct _HTStream {
1.85 frystyk 38: const HTStreamClass * isa;
1.60 frystyk 39: };
40:
1.88 frystyk 41: struct _HTCoding {
42: HTEncoding encoding;
43: HTCoder * encoder;
44: HTCoder * decoder;
1.87 frystyk 45: double quality;
46: };
47:
1.52 frystyk 48: /* ------------------------------------------------------------------------- */
1.87 frystyk 49: /* BASIC CONVERTERS */
50: /* ------------------------------------------------------------------------- */
51:
52: PUBLIC HTStream * HTBlackHoleConverter (HTRequest * request,
53: void * param,
54: HTFormat input_format,
55: HTFormat output_format,
56: HTStream * output_stream)
57: {
58: return HTBlackHole();
59: }
60: /* HTThroughLine
61: ** -------------
62: **
63: ** This function is a dummy function that returns the same output stream
64: ** as given as a parameter. Henrik 01/03-94
65: */
66: PUBLIC HTStream* HTThroughLine (HTRequest * request,
67: void * param,
68: HTFormat input_format,
69: HTFormat output_format,
70: HTStream * output_stream)
71: {
72: return output_stream;
73: }
74:
1.52 frystyk 75: /*
1.63 frystyk 76: ** For all `accept lists' there is a local list and a global list. The
77: ** local list is a part of the request structure and the global list is
78: ** internal to the HTFormat module. The global lists can be used when
79: ** specifying accept lists for ALL requests and the local list can be
80: ** used to add specific accept headers to the request.
81: */
82:
1.88 frystyk 83: /* ------------------------------------------------------------------------- */
84: /* CONTENT TYPES */
85: /* ------------------------------------------------------------------------- */
1.61 frystyk 86:
1.2 timbl 87: /* Define a presentation system command for a content-type
88: ** -------------------------------------------------------
1.52 frystyk 89: ** INPUT:
90: ** conversions: The list of conveters and presenters
91: ** representation: the MIME-style format name
92: ** command: the MAILCAP-style command template
93: ** quality: A degradation faction [0..1]
94: ** maxbytes: A limit on the length acceptable as input (0 infinite)
95: ** maxsecs: A limit on the time user will wait (0 for infinity)
1.2 timbl 96: */
1.72 frystyk 97: PUBLIC void HTPresentation_add (HTList * conversions,
1.85 frystyk 98: const char * representation,
99: const char * command,
100: const char * test_command,
1.72 frystyk 101: double quality,
102: double secs,
103: double secs_per_byte)
1.52 frystyk 104: {
1.83 frystyk 105: HTPresentation * pres;
106: if ((pres = (HTPresentation *) HT_CALLOC(1,sizeof(HTPresentation))) == NULL)
107: HT_OUTOFMEM("HTSetPresentation");
1.2 timbl 108:
109: pres->rep = HTAtom_for(representation);
110: pres->rep_out = WWW_PRESENT; /* Fixed for now ... :-) */
111: pres->converter = HTSaveAndExecute; /* Fixed for now ... */
112: pres->quality = quality;
113: pres->secs = secs;
114: pres->secs_per_byte = secs_per_byte;
115: pres->rep = HTAtom_for(representation);
1.49 howcome 116: pres->command = NULL;
1.2 timbl 117: StrAllocCopy(pres->command, command);
1.49 howcome 118: pres->test_command = NULL;
119: StrAllocCopy(pres->test_command, test_command);
1.91 frystyk 120: if (CORE_TRACE)
121: HTTrace("Presentation Adding `%s\' with quality %.2f\n",
122: command, quality);
1.12 timbl 123: HTList_addObject(conversions, pres);
1.2 timbl 124: }
125:
1.73 frystyk 126: PUBLIC void HTPresentation_deleteAll (HTList * list)
127: {
128: if (list) {
129: HTList *cur = list;
130: HTPresentation *pres;
131: while ((pres = (HTPresentation*) HTList_nextObject(cur))) {
1.83 frystyk 132: HT_FREE(pres->command);
133: HT_FREE(pres);
1.73 frystyk 134: }
135: HTList_delete(list);
136: }
137: }
1.2 timbl 138:
139: /* Define a built-in function for a content-type
140: ** ---------------------------------------------
141: */
1.72 frystyk 142: PUBLIC void HTConversion_add (HTList * conversions,
1.85 frystyk 143: const char * representation_in,
144: const char * representation_out,
1.72 frystyk 145: HTConverter * converter,
146: double quality,
147: double secs,
148: double secs_per_byte)
1.52 frystyk 149: {
1.83 frystyk 150: HTPresentation * pres;
1.87 frystyk 151: if ((pres = (HTPresentation*) HT_CALLOC(1,sizeof(HTPresentation))) == NULL)
1.83 frystyk 152: HT_OUTOFMEM("HTSetPresentation");
1.2 timbl 153: pres->rep = HTAtom_for(representation_in);
154: pres->rep_out = HTAtom_for(representation_out);
155: pres->converter = converter;
156: pres->command = NULL; /* Fixed */
1.49 howcome 157: pres->test_command = NULL;
1.2 timbl 158: pres->quality = quality;
159: pres->secs = secs;
160: pres->secs_per_byte = secs_per_byte;
1.91 frystyk 161: if (CORE_TRACE)
162: HTTrace("Conversions. Adding %p with quality %.2f\n",
163: converter, quality);
1.12 timbl 164: HTList_addObject(conversions, pres);
1.56 frystyk 165: }
166:
1.73 frystyk 167: PUBLIC void HTConversion_deleteAll (HTList * list)
168: {
169: HTPresentation_deleteAll(list);
170: }
171:
1.88 frystyk 172: /* ------------------------------------------------------------------------- */
173: /* CONTENT ENCODING AND CONTENT TRANSFER ENCODING */
174: /* ------------------------------------------------------------------------- */
175:
176: PUBLIC BOOL HTCoding_add (HTList * list,
177: const char * encoding,
178: HTCoder * encoder,
179: HTCoder * decoder,
180: double quality)
1.73 frystyk 181: {
1.88 frystyk 182: if (list && encoding && (encoder || decoder)) {
183: HTCoding * me;
184: if ((me = (HTCoding *) HT_CALLOC(1, sizeof(HTCoding))) == NULL)
185: HT_OUTOFMEM("HTCoding_add");
186: me->encoding = HTAtom_for(encoding);
1.87 frystyk 187: me->encoder = encoder;
188: me->decoder = decoder;
189: me->quality = quality;
190: if (CORE_TRACE)
191: HTTrace("Codings..... Adding %s with quality %.2f\n",
1.88 frystyk 192: encoding, quality);
1.87 frystyk 193: return HTList_addObject(list, (void *) me);
1.73 frystyk 194: }
1.87 frystyk 195: if (CORE_TRACE) HTTrace("Codings..... Bad argument\n");
196: return NO;
1.73 frystyk 197: }
198:
1.88 frystyk 199: PUBLIC void HTCoding_deleteAll (HTList * list)
1.73 frystyk 200: {
201: if (list) {
1.87 frystyk 202: HTList * cur = list;
1.88 frystyk 203: HTCoding * pres;
204: while ((pres = (HTCoding *) HTList_nextObject(cur)))
1.83 frystyk 205: HT_FREE(pres);
1.73 frystyk 206: HTList_delete(list);
207: }
208: }
209:
1.88 frystyk 210: PUBLIC const char * HTCoding_name (HTCoding * me)
1.87 frystyk 211: {
1.88 frystyk 212: return me ? HTAtom_name(me->encoding) : NULL;
1.87 frystyk 213: }
214:
1.88 frystyk 215: /* ------------------------------------------------------------------------- */
216: /* CONTENT LANGUAGE */
217: /* ------------------------------------------------------------------------- */
218:
1.73 frystyk 219: PUBLIC void HTLanguage_add (HTList * list,
1.85 frystyk 220: const char * lang,
1.73 frystyk 221: double quality)
222: {
223: HTAcceptNode * node;
224: if (!list || !lang || !*lang) {
1.87 frystyk 225: if (CORE_TRACE)
1.84 eric 226: HTTrace("Languages... Bad argument\n");
1.73 frystyk 227: return;
228: }
1.83 frystyk 229: if ((node = (HTAcceptNode *) HT_CALLOC(1, sizeof(HTAcceptNode))) == NULL)
230: HT_OUTOFMEM("HTAcceptLanguage");
1.73 frystyk 231:
232: HTList_addObject(list, (void*)node);
233: node->atom = HTAtom_for(lang);
234: node->quality = quality;
235: }
236:
237: PUBLIC void HTLanguage_deleteAll (HTList * list)
238: {
1.87 frystyk 239: if (list) {
240: HTList *cur = list;
241: HTAcceptNode *pres;
242: while ((pres = (HTAcceptNode *) HTList_nextObject(cur))) {
243: HT_FREE(pres);
244: }
245: HTList_delete(list);
246: }
1.73 frystyk 247: }
248:
1.88 frystyk 249: /* ------------------------------------------------------------------------- */
250: /* CONTENT CHARSET */
251: /* ------------------------------------------------------------------------- */
252:
1.73 frystyk 253: PUBLIC void HTCharset_add (HTList * list,
1.85 frystyk 254: const char * charset,
1.73 frystyk 255: double quality)
256: {
257: HTAcceptNode * node;
258: if (!list || !charset || !*charset) {
1.87 frystyk 259: if (CORE_TRACE)
1.84 eric 260: HTTrace("Charset..... Bad argument\n");
1.73 frystyk 261: return;
262: }
1.83 frystyk 263: if ((node = (HTAcceptNode *) HT_CALLOC(1, sizeof(HTAcceptNode))) == NULL)
264: HT_OUTOFMEM("HTAcceptCharsetuage");
1.73 frystyk 265:
266: HTList_addObject(list, (void*)node);
267: node->atom = HTAtom_for(charset);
268: node->quality = quality;
269: }
270:
271: PUBLIC void HTCharset_deleteAll (HTList * list)
272: {
1.87 frystyk 273: if (list) {
274: HTList *cur = list;
275: HTAcceptNode *pres;
276: while ((pres = (HTAcceptNode *) HTList_nextObject(cur))) {
277: HT_FREE(pres);
278: }
279: HTList_delete(list);
280: }
1.73 frystyk 281: }
282:
283: /* ------------------------------------------------------------------------- */
284: /* GLOBAL LIST OF CONVERTERS ETC. */
285: /* ------------------------------------------------------------------------- */
286:
1.72 frystyk 287: /*
288: ** Global Accept Format Types Conversions
289: ** list can be NULL
290: */
1.73 frystyk 291: PUBLIC void HTFormat_setConversion (HTList * list)
1.72 frystyk 292: {
293: HTConversions = list;
294: }
295:
296: PUBLIC HTList * HTFormat_conversion (void)
297: {
298: return HTConversions;
299: }
300:
1.92 frystyk 301: PUBLIC void HTFormat_addConversion (const char * input_format,
302: const char * output_format,
303: HTConverter * converter,
304: double quality,
305: double secs,
306: double secs_per_byte)
307: {
308: if (!HTConversions) HTConversions = HTList_new();
309: HTConversion_add(HTConversions, input_format, output_format,
310: converter, quality, secs, secs_per_byte);
311: }
312:
1.72 frystyk 313: /*
1.88 frystyk 314: ** Global list of Content Encodings
1.72 frystyk 315: ** list can be NULL
316: */
1.88 frystyk 317: PUBLIC void HTFormat_setContentCoding (HTList *list)
1.72 frystyk 318: {
1.88 frystyk 319: HTContentCoders = list;
1.72 frystyk 320: }
321:
1.88 frystyk 322: PUBLIC HTList * HTFormat_contentCoding (void)
1.72 frystyk 323: {
1.88 frystyk 324: return HTContentCoders;
1.72 frystyk 325: }
326:
1.92 frystyk 327: PUBLIC BOOL HTFormat_addCoding ( char * encoding,
328: HTCoder * encoder,
329: HTCoder * decoder,
330: double quality)
331: {
332: if (!HTContentCoders) HTContentCoders = HTList_new();
333: return HTCoding_add(HTContentCoders, encoding, encoder, decoder, quality);
334: }
335:
1.72 frystyk 336: /*
1.88 frystyk 337: ** Global list of Content Transfer Encodings
338: ** list can be NULL
339: */
340: PUBLIC void HTFormat_setTransferCoding (HTList *list)
341: {
342: HTTransferCoders = list;
343: }
344:
345: PUBLIC HTList * HTFormat_transferCoding (void)
346: {
347: return HTTransferCoders;
1.92 frystyk 348: }
349:
350: PUBLIC BOOL HTFormat_addTransferCoding ( char * encoding,
351: HTCoder * encoder,
352: HTCoder * decoder,
353: double quality)
354: {
355: if (!HTTransferCoders) HTTransferCoders = HTList_new();
356: return HTCoding_add(HTTransferCoders, encoding, encoder, decoder, quality);
1.88 frystyk 357: }
358:
359: /*
1.72 frystyk 360: ** Global Accept Languages
361: ** list can be NULL
362: */
363: PUBLIC void HTFormat_setLanguage (HTList *list)
364: {
365: HTLanguages = list;
366: }
367:
368: PUBLIC HTList * HTFormat_language (void)
369: {
370: return HTLanguages;
371: }
372:
373: /*
374: ** Global Accept Charsets
375: ** list can be NULL
376: */
377: PUBLIC void HTFormat_setCharset (HTList *list)
378: {
379: HTCharsets = list;
380: }
381:
382: PUBLIC HTList * HTFormat_charset (void)
383: {
384: return HTCharsets;
385: }
1.56 frystyk 386:
1.73 frystyk 387: /*
388: ** Convenience function to clean up
389: */
390: PUBLIC void HTFormat_deleteAll (void)
1.17 luotonen 391: {
1.73 frystyk 392: if (HTConversions) {
393: HTConversion_deleteAll(HTConversions);
394: HTConversions = NULL;
395: }
396: if (HTLanguages) {
397: HTLanguage_deleteAll(HTLanguages);
398: HTLanguages = NULL;
1.63 frystyk 399: }
1.88 frystyk 400: if (HTContentCoders) {
401: HTCoding_deleteAll(HTContentCoders);
402: HTContentCoders = NULL;
1.63 frystyk 403: }
1.88 frystyk 404: if (HTTransferCoders) {
405: HTCoding_deleteAll(HTTransferCoders);
406: HTTransferCoders = NULL;
407: }
1.73 frystyk 408: if (HTCharsets) {
409: HTCharset_deleteAll(HTCharsets);
410: HTCharsets = NULL;
1.63 frystyk 411: }
1.17 luotonen 412: }
413:
1.63 frystyk 414: /* ------------------------------------------------------------------------- */
1.90 frystyk 415: /* STREAM STACKS */
1.63 frystyk 416: /* ------------------------------------------------------------------------- */
417:
1.77 frystyk 418: PRIVATE BOOL better_match (HTFormat f, HTFormat g)
1.63 frystyk 419: {
1.85 frystyk 420: const char *p, *q;
1.63 frystyk 421:
422: if (f && g && (p = HTAtom_name(f)) && (q = HTAtom_name(g))) {
423: int i,j;
424: for(i=0 ; *p; p++) if (*p == '*') i++;
425: for(j=0 ; *q; q++) if (*q == '*') j++;
426: if (i < j) return YES;
427: }
428: return NO;
429: }
430:
1.87 frystyk 431: /* Create a Content Type filter stack
432: ** ----------------------------------
1.7 secret 433: ** If a wildcard match is made, a temporary HTPresentation
1.2 timbl 434: ** structure is made to hold the destination format while the
435: ** new stack is generated. This is just to pass the out format to
436: ** MIME so far. Storing the format of a stream in the stream might
437: ** be a lot neater.
1.10 timbl 438: **
1.29 frystyk 439: ** The star/star format is special, in that if you can take
1.40 frystyk 440: ** that you can take anything.
1.2 timbl 441: */
1.77 frystyk 442: PUBLIC HTStream * HTStreamStack (HTFormat rep_in,
443: HTFormat rep_out,
444: HTStream * output_stream,
445: HTRequest * request,
446: BOOL guess)
1.2 timbl 447: {
1.14 timbl 448: HTList * conversion[2];
449: int which_list;
1.59 frystyk 450: double best_quality = -1e30; /* Pretty bad! */
1.65 frystyk 451: HTPresentation *pres, *best_match=NULL;
1.80 frystyk 452: if (rep_out == WWW_RAW) {
1.87 frystyk 453: if (CORE_TRACE) HTTrace("StreamStack. Raw output...\n");
1.81 frystyk 454: return output_stream ? output_stream : HTErrorStream();
1.34 luotonen 455: }
1.79 frystyk 456:
1.80 frystyk 457: if (rep_out == rep_in) {
1.87 frystyk 458: if (CORE_TRACE)
1.84 eric 459: HTTrace("StreamStack. Identical input/output format (%s)\n",
1.80 frystyk 460: HTAtom_name(rep_out));
1.81 frystyk 461: return output_stream ? output_stream : HTErrorStream();
1.74 frystyk 462: }
1.87 frystyk 463: if (CORE_TRACE) {
1.89 eric 464: const char *p = HTAtom_name(rep_in);
465: const char *q = HTAtom_name(rep_out);
1.84 eric 466: HTTrace("StreamStack. Constructing stream stack for %s to %s\n",
1.82 frystyk 467: p ? p : "<NULL>", q ? q : "<NULL>");
1.47 frystyk 468: }
1.2 timbl 469:
1.88 frystyk 470: conversion[0] = HTRequest_conversion(request);
1.14 timbl 471: conversion[1] = HTConversions;
1.17 luotonen 472:
1.15 luotonen 473: for(which_list = 0; which_list<2; which_list++) {
474: HTList * cur = conversion[which_list];
475: while ((pres = (HTPresentation*)HTList_nextObject(cur))) {
1.93 ! frystyk 476: if ((pres->rep==rep_in || HTMIMEMatch(pres->rep, rep_in)) &&
! 477: (pres->rep_out==rep_out || HTMIMEMatch(pres->rep_out,rep_out))){
1.65 frystyk 478: if (!best_match || better_match(pres->rep, best_match->rep) ||
1.33 luotonen 479: (!better_match(best_match->rep, pres->rep) &&
480: pres->quality > best_quality)) {
1.85 frystyk 481: #ifdef HAVE_SYSTEM
1.65 frystyk 482: int result=0;
483: if (pres->test_command) {
484: result = system(pres->test_command);
1.87 frystyk 485: if (CORE_TRACE)
1.84 eric 486: HTTrace("StreamStack. system(%s) returns %d\n", pres->test_command, result);
1.65 frystyk 487: }
488: if (!result) {
1.49 howcome 489: best_match = pres;
490: best_quality = pres->quality;
491: }
1.65 frystyk 492: #else
493: best_match = pres;
494: best_quality = pres->quality;
1.85 frystyk 495: #endif /* HAVE_SYSTEM */
1.10 timbl 496: }
497: }
1.2 timbl 498: }
499: }
1.80 frystyk 500:
501: if (best_match) {
502: if (rep_out == WWW_SOURCE && best_match->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: }
1.65 frystyk 506: return (*best_match->converter)(request, best_match->command,
507: rep_in, rep_out, output_stream);
1.80 frystyk 508: }
509: if (rep_out == WWW_SOURCE) {
1.87 frystyk 510: if (CORE_TRACE) HTTrace("StreamStack. Source output\n");
1.81 frystyk 511: return output_stream ? output_stream : HTErrorStream();
1.80 frystyk 512: }
513:
1.87 frystyk 514: if (CORE_TRACE)
1.84 eric 515: HTTrace("StreamStack. No match found, dumping to local file\n");
1.65 frystyk 516: return HTSaveLocally(request, NULL, rep_in, rep_out, output_stream);
1.2 timbl 517: }
518:
519:
520: /* Find the cost of a filter stack
521: ** -------------------------------
522: **
523: ** Must return the cost of the same stack which StreamStack would set up.
524: **
525: ** On entry,
526: ** length The size of the data to be converted
527: */
1.77 frystyk 528: PUBLIC double HTStackValue (HTList * theseConversions,
529: HTFormat rep_in,
530: HTFormat rep_out,
531: double initial_value,
532: long int length)
1.2 timbl 533: {
1.14 timbl 534: int which_list;
535: HTList* conversion[2];
536:
1.87 frystyk 537: if (CORE_TRACE) {
1.84 eric 538: HTTrace("StackValue.. Evaluating stream stack for %s worth %.3f to %s\n",
1.65 frystyk 539: HTAtom_name(rep_in), initial_value,
540: HTAtom_name(rep_out));
541: }
1.2 timbl 542: if (rep_out == WWW_SOURCE ||
1.10 timbl 543: rep_out == rep_in) return 0.0;
1.2 timbl 544:
1.14 timbl 545: conversion[0] = theseConversions;
546: conversion[1] = HTConversions;
547:
548: for(which_list = 0; which_list<2; which_list++)
549: if (conversion[which_list]) {
1.15 luotonen 550: HTList * cur = conversion[which_list];
1.2 timbl 551: HTPresentation * pres;
1.15 luotonen 552: while ((pres = (HTPresentation*)HTList_nextObject(cur))) {
553: if (pres->rep == rep_in &&
1.93 ! frystyk 554: (pres->rep_out == rep_out || HTMIMEMatch(pres->rep_out, rep_out))) {
1.59 frystyk 555: double value = initial_value * pres->quality;
1.2 timbl 556: if (HTMaxSecs != 0.0)
1.15 luotonen 557: value = value - (length*pres->secs_per_byte + pres->secs)
1.2 timbl 558: /HTMaxSecs;
559: return value;
560: }
561: }
562: }
1.63 frystyk 563: return NO_VALUE_FOUND; /* Really bad */
1.1 timbl 564: }
1.2 timbl 565:
1.87 frystyk 566: /* Create a new coder and insert it into stream chain
567: ** --------------------------------------------------
568: ** Creating the content decoding stack is not based on quality factors as
569: ** we don't have the freedom as with content types. Specify whether you
1.88 frystyk 570: ** you want encoding or decoding using the BOOL "encode" flag.
1.87 frystyk 571: */
1.88 frystyk 572: PUBLIC HTStream * HTContentCodingStack (HTEncoding encoding,
573: HTStream * target,
574: HTRequest * request,
575: void * param,
576: BOOL encode)
1.87 frystyk 577: {
578: HTList * coders[2];
579: HTStream * top = target;
1.88 frystyk 580: HTCoding * pres = NULL;
1.87 frystyk 581: int cnt;
1.88 frystyk 582: if (!encoding || !request) {
1.87 frystyk 583: if (CORE_TRACE) HTTrace("Codings... Nothing applied...\n");
584: return target ? target : HTErrorStream();
585: }
1.88 frystyk 586: coders[0] = HTRequest_encoding(request);
587: coders[1] = HTContentCoders;
1.87 frystyk 588: if (CORE_TRACE)
1.88 frystyk 589: HTTrace("Codings..... Looking for %s\n", HTAtom_name(encoding));
1.87 frystyk 590: for (cnt=0; cnt < 2; cnt++) {
591: HTList * cur = coders[cnt];
1.88 frystyk 592: while ((pres = (HTCoding *) HTList_nextObject(cur))) {
593: if (pres->encoding == encoding) {
1.87 frystyk 594: if (CORE_TRACE) HTTrace("Codings..... Found...\n");
1.88 frystyk 595: if (encode) {
1.87 frystyk 596: if (pres->encoder)
1.88 frystyk 597: top = (*pres->encoder)(request, param, encoding, top);
1.87 frystyk 598: break;
599: } else if (pres->decoder) {
1.88 frystyk 600: top = (*pres->decoder)(request, param, encoding, top);
1.87 frystyk 601: break;
602: }
603: }
604: }
605: }
606: return top;
607: }
1.10 timbl 608:
1.87 frystyk 609: /*
610: ** Here you can provide a complete list instead of a single token.
611: ** The list has to filled up in the order the _encodings_ are to be applied
612: */
1.88 frystyk 613: PUBLIC HTStream * HTContentEncodingStack (HTList * encodings,
614: HTStream * target,
615: HTRequest * request,
616: void * param)
1.87 frystyk 617: {
618: if (encodings) {
619: HTList * cur = encodings;
620: HTEncoding pres;
621: HTStream * top = target;
622: while ((pres = (HTEncoding) HTList_nextObject(cur)))
1.88 frystyk 623: top = HTContentCodingStack(pres, top, request, param, YES);
1.87 frystyk 624: return top;
625: }
626: return HTErrorStream();
627: }
628:
629: /*
630: ** Here you can provide a complete list instead of a single token.
631: ** The list has to be in the order the _encodings_ were applied - that
632: ** is, the same way that _encodings_ are to be applied. This is all consistent
633: ** with the order of the Content-Encoding header.
634: */
1.88 frystyk 635: PUBLIC HTStream * HTContentDecodingStack (HTList * encodings,
636: HTStream * target,
637: HTRequest * request,
638: void * param)
1.87 frystyk 639: {
640: if (encodings) {
641: HTEncoding pres;
642: int cnt = HTList_count(encodings);
643: HTStream * top = target;
644: while (cnt > 0) {
645: pres = (HTEncoding) HTList_objectAt(encodings, --cnt);
1.88 frystyk 646: top = HTContentCodingStack(pres, top, request, param, NO);
1.87 frystyk 647: }
648: return top;
649: }
650: return HTErrorStream();
651: }
1.88 frystyk 652:
653: /* Create a new transfer coder and insert it into stream chain
654: ** -----------------------------------------------------------
655: ** Creating the content decoding stack is not based on quality factors as
656: ** we don't have the freedom as with content types. Specify whether you
657: ** you want encoding or decoding using the BOOL "encode" flag.
658: */
659: PUBLIC HTStream * HTTransferCodingStack (HTEncoding encoding,
660: HTStream * target,
661: HTRequest * request,
662: void * param,
663: BOOL encode)
664: {
665: HTList * coders[2];
666: HTStream * top = target;
667: HTCoding * pres = NULL;
668: int cnt;
669: if (!encoding || !request) {
670: if (CORE_TRACE) HTTrace("C-T-E..... Nothing applied...\n");
671: return target ? target : HTErrorStream();
672: }
673: coders[0] = HTRequest_transfer(request);
674: coders[1] = HTTransferCoders;
675: if (CORE_TRACE)
676: HTTrace("C-T-E....... Looking for %s\n", HTAtom_name(encoding));
677: for (cnt=0; cnt < 2; cnt++) {
678: HTList * cur = coders[cnt];
679: while ((pres = (HTCoding *) HTList_nextObject(cur))) {
680: if (pres->encoding == encoding) {
681: if (CORE_TRACE) HTTrace("C-T-E....... Found...\n");
682: if (encode) {
683: if (pres->encoder)
684: top = (*pres->encoder)(request, param, encoding, top);
685: break;
686: } else if (pres->decoder) {
687: top = (*pres->decoder)(request, param, encoding, top);
688: break;
689: }
690: }
691: }
692: }
693: return top;
694: }
695:
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