Annotation of libwww/Library/src/HTFormat.c, revision 1.91
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.
1.91 ! frystyk 6: ** @(#) $Id: HTFormat.c,v 1.90 1996/06/08 01:52:11 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"
1.58 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);
1.91 ! frystyk 119: if (CORE_TRACE)
! 120: HTTrace("Presentation Adding `%s\' with quality %.2f\n",
! 121: command, quality);
1.12 timbl 122: HTList_addObject(conversions, pres);
1.2 timbl 123: }
124:
1.73 frystyk 125: PUBLIC void HTPresentation_deleteAll (HTList * list)
126: {
127: if (list) {
128: HTList *cur = list;
129: HTPresentation *pres;
130: while ((pres = (HTPresentation*) HTList_nextObject(cur))) {
1.83 frystyk 131: HT_FREE(pres->command);
132: HT_FREE(pres);
1.73 frystyk 133: }
134: HTList_delete(list);
135: }
136: }
1.2 timbl 137:
138: /* Define a built-in function for a content-type
139: ** ---------------------------------------------
140: */
1.72 frystyk 141: PUBLIC void HTConversion_add (HTList * conversions,
1.85 frystyk 142: const char * representation_in,
143: const char * representation_out,
1.72 frystyk 144: HTConverter * converter,
145: double quality,
146: double secs,
147: double secs_per_byte)
1.52 frystyk 148: {
1.83 frystyk 149: HTPresentation * pres;
1.87 frystyk 150: if ((pres = (HTPresentation*) HT_CALLOC(1,sizeof(HTPresentation))) == NULL)
1.83 frystyk 151: HT_OUTOFMEM("HTSetPresentation");
1.2 timbl 152: pres->rep = HTAtom_for(representation_in);
153: pres->rep_out = HTAtom_for(representation_out);
154: pres->converter = converter;
155: pres->command = NULL; /* Fixed */
1.49 howcome 156: pres->test_command = NULL;
1.2 timbl 157: pres->quality = quality;
158: pres->secs = secs;
159: pres->secs_per_byte = secs_per_byte;
1.91 ! frystyk 160: if (CORE_TRACE)
! 161: HTTrace("Conversions. Adding %p with quality %.2f\n",
! 162: converter, quality);
1.12 timbl 163: HTList_addObject(conversions, pres);
1.56 frystyk 164: }
165:
1.73 frystyk 166: PUBLIC void HTConversion_deleteAll (HTList * list)
167: {
168: HTPresentation_deleteAll(list);
169: }
170:
1.88 frystyk 171: /* ------------------------------------------------------------------------- */
172: /* CONTENT ENCODING AND CONTENT TRANSFER ENCODING */
173: /* ------------------------------------------------------------------------- */
174:
175: PUBLIC BOOL HTCoding_add (HTList * list,
176: const char * encoding,
177: HTCoder * encoder,
178: HTCoder * decoder,
179: double quality)
1.73 frystyk 180: {
1.88 frystyk 181: if (list && encoding && (encoder || decoder)) {
182: HTCoding * me;
183: if ((me = (HTCoding *) HT_CALLOC(1, sizeof(HTCoding))) == NULL)
184: HT_OUTOFMEM("HTCoding_add");
185: me->encoding = HTAtom_for(encoding);
1.87 frystyk 186: me->encoder = encoder;
187: me->decoder = decoder;
188: me->quality = quality;
189: if (CORE_TRACE)
190: HTTrace("Codings..... Adding %s with quality %.2f\n",
1.88 frystyk 191: encoding, quality);
1.87 frystyk 192: return HTList_addObject(list, (void *) me);
1.73 frystyk 193: }
1.87 frystyk 194: if (CORE_TRACE) HTTrace("Codings..... Bad argument\n");
195: return NO;
1.73 frystyk 196: }
197:
1.88 frystyk 198: PUBLIC void HTCoding_deleteAll (HTList * list)
1.73 frystyk 199: {
200: if (list) {
1.87 frystyk 201: HTList * cur = list;
1.88 frystyk 202: HTCoding * pres;
203: while ((pres = (HTCoding *) HTList_nextObject(cur)))
1.83 frystyk 204: HT_FREE(pres);
1.73 frystyk 205: HTList_delete(list);
206: }
207: }
208:
1.88 frystyk 209: PUBLIC const char * HTCoding_name (HTCoding * me)
1.87 frystyk 210: {
1.88 frystyk 211: return me ? HTAtom_name(me->encoding) : NULL;
1.87 frystyk 212: }
213:
1.88 frystyk 214: /* ------------------------------------------------------------------------- */
215: /* CONTENT LANGUAGE */
216: /* ------------------------------------------------------------------------- */
217:
1.73 frystyk 218: PUBLIC void HTLanguage_add (HTList * list,
1.85 frystyk 219: const char * lang,
1.73 frystyk 220: double quality)
221: {
222: HTAcceptNode * node;
223: if (!list || !lang || !*lang) {
1.87 frystyk 224: if (CORE_TRACE)
1.84 eric 225: HTTrace("Languages... Bad argument\n");
1.73 frystyk 226: return;
227: }
1.83 frystyk 228: if ((node = (HTAcceptNode *) HT_CALLOC(1, sizeof(HTAcceptNode))) == NULL)
229: HT_OUTOFMEM("HTAcceptLanguage");
1.73 frystyk 230:
231: HTList_addObject(list, (void*)node);
232: node->atom = HTAtom_for(lang);
233: node->quality = quality;
234: }
235:
236: PUBLIC void HTLanguage_deleteAll (HTList * list)
237: {
1.87 frystyk 238: if (list) {
239: HTList *cur = list;
240: HTAcceptNode *pres;
241: while ((pres = (HTAcceptNode *) HTList_nextObject(cur))) {
242: HT_FREE(pres);
243: }
244: HTList_delete(list);
245: }
1.73 frystyk 246: }
247:
1.88 frystyk 248: /* ------------------------------------------------------------------------- */
249: /* CONTENT CHARSET */
250: /* ------------------------------------------------------------------------- */
251:
1.73 frystyk 252: PUBLIC void HTCharset_add (HTList * list,
1.85 frystyk 253: const char * charset,
1.73 frystyk 254: double quality)
255: {
256: HTAcceptNode * node;
257: if (!list || !charset || !*charset) {
1.87 frystyk 258: if (CORE_TRACE)
1.84 eric 259: HTTrace("Charset..... Bad argument\n");
1.73 frystyk 260: return;
261: }
1.83 frystyk 262: if ((node = (HTAcceptNode *) HT_CALLOC(1, sizeof(HTAcceptNode))) == NULL)
263: HT_OUTOFMEM("HTAcceptCharsetuage");
1.73 frystyk 264:
265: HTList_addObject(list, (void*)node);
266: node->atom = HTAtom_for(charset);
267: node->quality = quality;
268: }
269:
270: PUBLIC void HTCharset_deleteAll (HTList * list)
271: {
1.87 frystyk 272: if (list) {
273: HTList *cur = list;
274: HTAcceptNode *pres;
275: while ((pres = (HTAcceptNode *) HTList_nextObject(cur))) {
276: HT_FREE(pres);
277: }
278: HTList_delete(list);
279: }
1.73 frystyk 280: }
281:
282: /* ------------------------------------------------------------------------- */
283: /* GLOBAL LIST OF CONVERTERS ETC. */
284: /* ------------------------------------------------------------------------- */
285:
1.72 frystyk 286: /*
287: ** Global Accept Format Types Conversions
288: ** list can be NULL
289: */
1.73 frystyk 290: PUBLIC void HTFormat_setConversion (HTList * list)
1.72 frystyk 291: {
292: HTConversions = list;
293: }
294:
295: PUBLIC HTList * HTFormat_conversion (void)
296: {
297: return HTConversions;
298: }
299:
300: /*
1.88 frystyk 301: ** Global list of Content Encodings
1.72 frystyk 302: ** list can be NULL
303: */
1.88 frystyk 304: PUBLIC void HTFormat_setContentCoding (HTList *list)
1.72 frystyk 305: {
1.88 frystyk 306: HTContentCoders = list;
1.72 frystyk 307: }
308:
1.88 frystyk 309: PUBLIC HTList * HTFormat_contentCoding (void)
1.72 frystyk 310: {
1.88 frystyk 311: return HTContentCoders;
1.72 frystyk 312: }
313:
314: /*
1.88 frystyk 315: ** Global list of Content Transfer Encodings
316: ** list can be NULL
317: */
318: PUBLIC void HTFormat_setTransferCoding (HTList *list)
319: {
320: HTTransferCoders = list;
321: }
322:
323: PUBLIC HTList * HTFormat_transferCoding (void)
324: {
325: return HTTransferCoders;
326: }
327:
328: /*
1.72 frystyk 329: ** Global Accept Languages
330: ** list can be NULL
331: */
332: PUBLIC void HTFormat_setLanguage (HTList *list)
333: {
334: HTLanguages = list;
335: }
336:
337: PUBLIC HTList * HTFormat_language (void)
338: {
339: return HTLanguages;
340: }
341:
342: /*
343: ** Global Accept Charsets
344: ** list can be NULL
345: */
346: PUBLIC void HTFormat_setCharset (HTList *list)
347: {
348: HTCharsets = list;
349: }
350:
351: PUBLIC HTList * HTFormat_charset (void)
352: {
353: return HTCharsets;
354: }
1.56 frystyk 355:
1.73 frystyk 356: /*
357: ** Convenience function to clean up
358: */
359: PUBLIC void HTFormat_deleteAll (void)
1.17 luotonen 360: {
1.73 frystyk 361: if (HTConversions) {
362: HTConversion_deleteAll(HTConversions);
363: HTConversions = NULL;
364: }
365: if (HTLanguages) {
366: HTLanguage_deleteAll(HTLanguages);
367: HTLanguages = NULL;
1.63 frystyk 368: }
1.88 frystyk 369: if (HTContentCoders) {
370: HTCoding_deleteAll(HTContentCoders);
371: HTContentCoders = NULL;
1.63 frystyk 372: }
1.88 frystyk 373: if (HTTransferCoders) {
374: HTCoding_deleteAll(HTTransferCoders);
375: HTTransferCoders = NULL;
376: }
1.73 frystyk 377: if (HTCharsets) {
378: HTCharset_deleteAll(HTCharsets);
379: HTCharsets = NULL;
1.63 frystyk 380: }
1.17 luotonen 381: }
382:
1.63 frystyk 383: /* ------------------------------------------------------------------------- */
1.90 frystyk 384: /* STREAM STACKS */
1.63 frystyk 385: /* ------------------------------------------------------------------------- */
386:
1.77 frystyk 387: PRIVATE BOOL better_match (HTFormat f, HTFormat g)
1.63 frystyk 388: {
1.85 frystyk 389: const char *p, *q;
1.63 frystyk 390:
391: if (f && g && (p = HTAtom_name(f)) && (q = HTAtom_name(g))) {
392: int i,j;
393: for(i=0 ; *p; p++) if (*p == '*') i++;
394: for(j=0 ; *q; q++) if (*q == '*') j++;
395: if (i < j) return YES;
396: }
397: return NO;
398: }
399:
400:
1.77 frystyk 401: PRIVATE BOOL wild_match (HTAtom * tmplate, HTAtom * actual)
1.17 luotonen 402: {
1.89 eric 403: const char *t, *a;
404: char *st, *sa;
1.17 luotonen 405: BOOL match = NO;
406:
1.48 frystyk 407: if (tmplate && actual && (t = HTAtom_name(tmplate))) {
1.22 luotonen 408: if (!strcmp(t, "*"))
409: return YES;
1.17 luotonen 410:
1.22 luotonen 411: if (strchr(t, '*') &&
412: (a = HTAtom_name(actual)) &&
413: (st = strchr(t, '/')) && (sa = strchr(a,'/'))) {
1.17 luotonen 414:
1.22 luotonen 415: *sa = 0;
416: *st = 0;
417:
418: if ((*(st-1)=='*' &&
419: (*(st+1)=='*' || !strcasecomp(st+1, sa+1))) ||
420: (*(st+1)=='*' && !strcasecomp(t,a)))
421: match = YES;
422:
423: *sa = '/';
424: *st = '/';
425: }
426: }
1.23 luotonen 427: return match;
1.17 luotonen 428: }
429:
1.87 frystyk 430: /* Create a Content Type filter stack
431: ** ----------------------------------
1.7 secret 432: ** If a wildcard match is made, a temporary HTPresentation
1.2 timbl 433: ** structure is made to hold the destination format while the
434: ** new stack is generated. This is just to pass the out format to
435: ** MIME so far. Storing the format of a stream in the stream might
436: ** be a lot neater.
1.10 timbl 437: **
1.29 frystyk 438: ** The star/star format is special, in that if you can take
1.40 frystyk 439: ** that you can take anything.
1.2 timbl 440: */
1.77 frystyk 441: PUBLIC HTStream * HTStreamStack (HTFormat rep_in,
442: HTFormat rep_out,
443: HTStream * output_stream,
444: HTRequest * request,
445: BOOL guess)
1.2 timbl 446: {
1.14 timbl 447: HTList * conversion[2];
448: int which_list;
1.59 frystyk 449: double best_quality = -1e30; /* Pretty bad! */
1.65 frystyk 450: HTPresentation *pres, *best_match=NULL;
1.80 frystyk 451: if (rep_out == WWW_RAW) {
1.87 frystyk 452: if (CORE_TRACE) HTTrace("StreamStack. Raw output...\n");
1.81 frystyk 453: return output_stream ? output_stream : HTErrorStream();
1.34 luotonen 454: }
1.79 frystyk 455:
1.80 frystyk 456: if (rep_out == rep_in) {
1.87 frystyk 457: if (CORE_TRACE)
1.84 eric 458: HTTrace("StreamStack. Identical input/output format (%s)\n",
1.80 frystyk 459: HTAtom_name(rep_out));
1.81 frystyk 460: return output_stream ? output_stream : HTErrorStream();
1.74 frystyk 461: }
1.87 frystyk 462: if (CORE_TRACE) {
1.89 eric 463: const char *p = HTAtom_name(rep_in);
464: const char *q = HTAtom_name(rep_out);
1.84 eric 465: HTTrace("StreamStack. Constructing stream stack for %s to %s\n",
1.82 frystyk 466: p ? p : "<NULL>", q ? q : "<NULL>");
1.47 frystyk 467: }
1.2 timbl 468:
1.88 frystyk 469: conversion[0] = HTRequest_conversion(request);
1.14 timbl 470: conversion[1] = HTConversions;
1.17 luotonen 471:
1.15 luotonen 472: for(which_list = 0; which_list<2; which_list++) {
473: HTList * cur = conversion[which_list];
474: while ((pres = (HTPresentation*)HTList_nextObject(cur))) {
1.65 frystyk 475: if ((pres->rep==rep_in || wild_match(pres->rep, rep_in)) &&
476: (pres->rep_out==rep_out || wild_match(pres->rep_out,rep_out))){
477: if (!best_match || better_match(pres->rep, best_match->rep) ||
1.33 luotonen 478: (!better_match(best_match->rep, pres->rep) &&
479: pres->quality > best_quality)) {
1.85 frystyk 480: #ifdef HAVE_SYSTEM
1.65 frystyk 481: int result=0;
482: if (pres->test_command) {
483: result = system(pres->test_command);
1.87 frystyk 484: if (CORE_TRACE)
1.84 eric 485: HTTrace("StreamStack. system(%s) returns %d\n", pres->test_command, result);
1.65 frystyk 486: }
487: if (!result) {
1.49 howcome 488: best_match = pres;
489: best_quality = pres->quality;
490: }
1.65 frystyk 491: #else
492: best_match = pres;
493: best_quality = pres->quality;
1.85 frystyk 494: #endif /* HAVE_SYSTEM */
1.10 timbl 495: }
496: }
1.2 timbl 497: }
498: }
1.80 frystyk 499:
500: if (best_match) {
501: if (rep_out == WWW_SOURCE && best_match->rep_out != WWW_SOURCE) {
1.87 frystyk 502: if (CORE_TRACE) HTTrace("StreamStack. Source output\n");
1.81 frystyk 503: return output_stream ? output_stream : HTErrorStream();
1.80 frystyk 504: }
1.65 frystyk 505: return (*best_match->converter)(request, best_match->command,
506: rep_in, rep_out, output_stream);
1.80 frystyk 507: }
508: if (rep_out == WWW_SOURCE) {
1.87 frystyk 509: if (CORE_TRACE) HTTrace("StreamStack. Source output\n");
1.81 frystyk 510: return output_stream ? output_stream : HTErrorStream();
1.80 frystyk 511: }
512:
1.87 frystyk 513: if (CORE_TRACE)
1.84 eric 514: HTTrace("StreamStack. No match found, dumping to local file\n");
1.65 frystyk 515: return HTSaveLocally(request, NULL, rep_in, rep_out, output_stream);
1.2 timbl 516: }
517:
518:
519: /* Find the cost of a filter stack
520: ** -------------------------------
521: **
522: ** Must return the cost of the same stack which StreamStack would set up.
523: **
524: ** On entry,
525: ** length The size of the data to be converted
526: */
1.77 frystyk 527: PUBLIC double HTStackValue (HTList * theseConversions,
528: HTFormat rep_in,
529: HTFormat rep_out,
530: double initial_value,
531: long int length)
1.2 timbl 532: {
1.14 timbl 533: int which_list;
534: HTList* conversion[2];
535:
1.87 frystyk 536: if (CORE_TRACE) {
1.84 eric 537: HTTrace("StackValue.. Evaluating stream stack for %s worth %.3f to %s\n",
1.65 frystyk 538: HTAtom_name(rep_in), initial_value,
539: HTAtom_name(rep_out));
540: }
1.2 timbl 541: if (rep_out == WWW_SOURCE ||
1.10 timbl 542: rep_out == rep_in) return 0.0;
1.2 timbl 543:
1.14 timbl 544: conversion[0] = theseConversions;
545: conversion[1] = HTConversions;
546:
547: for(which_list = 0; which_list<2; which_list++)
548: if (conversion[which_list]) {
1.15 luotonen 549: HTList * cur = conversion[which_list];
1.2 timbl 550: HTPresentation * pres;
1.15 luotonen 551: while ((pres = (HTPresentation*)HTList_nextObject(cur))) {
552: if (pres->rep == rep_in &&
1.17 luotonen 553: (pres->rep_out == rep_out || wild_match(pres->rep_out, rep_out))) {
1.59 frystyk 554: double value = initial_value * pres->quality;
1.2 timbl 555: if (HTMaxSecs != 0.0)
1.15 luotonen 556: value = value - (length*pres->secs_per_byte + pres->secs)
1.2 timbl 557: /HTMaxSecs;
558: return value;
559: }
560: }
561: }
1.63 frystyk 562: return NO_VALUE_FOUND; /* Really bad */
1.1 timbl 563: }
1.2 timbl 564:
1.87 frystyk 565: /* Create a new coder and insert it into stream chain
566: ** --------------------------------------------------
567: ** Creating the content decoding stack is not based on quality factors as
568: ** we don't have the freedom as with content types. Specify whether you
1.88 frystyk 569: ** you want encoding or decoding using the BOOL "encode" flag.
1.87 frystyk 570: */
1.88 frystyk 571: PUBLIC HTStream * HTContentCodingStack (HTEncoding encoding,
572: HTStream * target,
573: HTRequest * request,
574: void * param,
575: BOOL encode)
1.87 frystyk 576: {
577: HTList * coders[2];
578: HTStream * top = target;
1.88 frystyk 579: HTCoding * pres = NULL;
1.87 frystyk 580: int cnt;
1.88 frystyk 581: if (!encoding || !request) {
1.87 frystyk 582: if (CORE_TRACE) HTTrace("Codings... Nothing applied...\n");
583: return target ? target : HTErrorStream();
584: }
1.88 frystyk 585: coders[0] = HTRequest_encoding(request);
586: coders[1] = HTContentCoders;
1.87 frystyk 587: if (CORE_TRACE)
1.88 frystyk 588: HTTrace("Codings..... Looking for %s\n", HTAtom_name(encoding));
1.87 frystyk 589: for (cnt=0; cnt < 2; cnt++) {
590: HTList * cur = coders[cnt];
1.88 frystyk 591: while ((pres = (HTCoding *) HTList_nextObject(cur))) {
592: if (pres->encoding == encoding) {
1.87 frystyk 593: if (CORE_TRACE) HTTrace("Codings..... Found...\n");
1.88 frystyk 594: if (encode) {
1.87 frystyk 595: if (pres->encoder)
1.88 frystyk 596: top = (*pres->encoder)(request, param, encoding, top);
1.87 frystyk 597: break;
598: } else if (pres->decoder) {
1.88 frystyk 599: top = (*pres->decoder)(request, param, encoding, top);
1.87 frystyk 600: break;
601: }
602: }
603: }
604: }
605: return top;
606: }
1.10 timbl 607:
1.87 frystyk 608: /*
609: ** Here you can provide a complete list instead of a single token.
610: ** The list has to filled up in the order the _encodings_ are to be applied
611: */
1.88 frystyk 612: PUBLIC HTStream * HTContentEncodingStack (HTList * encodings,
613: HTStream * target,
614: HTRequest * request,
615: void * param)
1.87 frystyk 616: {
617: if (encodings) {
618: HTList * cur = encodings;
619: HTEncoding pres;
620: HTStream * top = target;
621: while ((pres = (HTEncoding) HTList_nextObject(cur)))
1.88 frystyk 622: top = HTContentCodingStack(pres, top, request, param, YES);
1.87 frystyk 623: return top;
624: }
625: return HTErrorStream();
626: }
627:
628: /*
629: ** Here you can provide a complete list instead of a single token.
630: ** The list has to be in the order the _encodings_ were applied - that
631: ** is, the same way that _encodings_ are to be applied. This is all consistent
632: ** with the order of the Content-Encoding header.
633: */
1.88 frystyk 634: PUBLIC HTStream * HTContentDecodingStack (HTList * encodings,
635: HTStream * target,
636: HTRequest * request,
637: void * param)
1.87 frystyk 638: {
639: if (encodings) {
640: HTEncoding pres;
641: int cnt = HTList_count(encodings);
642: HTStream * top = target;
643: while (cnt > 0) {
644: pres = (HTEncoding) HTList_objectAt(encodings, --cnt);
1.88 frystyk 645: top = HTContentCodingStack(pres, top, request, param, NO);
1.87 frystyk 646: }
647: return top;
648: }
649: return HTErrorStream();
650: }
1.88 frystyk 651:
652: /* Create a new transfer coder and insert it into stream chain
653: ** -----------------------------------------------------------
654: ** Creating the content decoding stack is not based on quality factors as
655: ** we don't have the freedom as with content types. Specify whether you
656: ** you want encoding or decoding using the BOOL "encode" flag.
657: */
658: PUBLIC HTStream * HTTransferCodingStack (HTEncoding encoding,
659: HTStream * target,
660: HTRequest * request,
661: void * param,
662: BOOL encode)
663: {
664: HTList * coders[2];
665: HTStream * top = target;
666: HTCoding * pres = NULL;
667: int cnt;
668: if (!encoding || !request) {
669: if (CORE_TRACE) HTTrace("C-T-E..... Nothing applied...\n");
670: return target ? target : HTErrorStream();
671: }
672: coders[0] = HTRequest_transfer(request);
673: coders[1] = HTTransferCoders;
674: if (CORE_TRACE)
675: HTTrace("C-T-E....... Looking for %s\n", HTAtom_name(encoding));
676: for (cnt=0; cnt < 2; cnt++) {
677: HTList * cur = coders[cnt];
678: while ((pres = (HTCoding *) HTList_nextObject(cur))) {
679: if (pres->encoding == encoding) {
680: if (CORE_TRACE) HTTrace("C-T-E....... Found...\n");
681: if (encode) {
682: if (pres->encoder)
683: top = (*pres->encoder)(request, param, encoding, top);
684: break;
685: } else if (pres->decoder) {
686: top = (*pres->decoder)(request, param, encoding, top);
687: break;
688: }
689: }
690: }
691: }
692: return top;
693: }
694:
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