gweb/gweb.c

   1 /*
   2  *
   3  *  Web service library with GLib integration
   4  *
   5  *  Copyright (C) 2009-2010  Intel Corporation. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <errno.h>
  28 #include <unistd.h>
  29 #include <stdlib.h>
  30 #include <stdarg.h>
  31 #include <string.h>
  32 #include <sys/socket.h>
  33 #include <arpa/inet.h>
  34
  35 #include "giognutls.h"
  36 #include "gresolv.h"
  37 #include "gweb.h"
  38
  39 #define DEFAULT_BUFFER_SIZE  2048
  40
  41 #define SESSION_FLAG_USE_TLS    (1 << 0)
  42
  43 struct _GWebResult {
  44         guint16 status;
  45         const guint8 *buffer;
  46         gsize length;
  47 };
  48
  49 struct web_session {
  50         GWeb *web;
  51
  52         char *address;
  53         char *host;
  54         uint16_t port;
  55         unsigned long flags;
  56
  57         char *content_type;
  58
  59         GIOChannel *transport_channel;
  60         guint transport_watch;
  61         guint send_watch;
  62
  63         guint resolv_action;
  64         char *request;
  65
  66         guint8 *receive_buffer;
  67         gsize receive_space;
  68         GString *current_header;
  69         gboolean header_done;
  70         gboolean more_data;
  71         gboolean request_started;
  72
  73         GWebResult result;
  74
  75         GWebResultFunc result_func;
  76         GWebInputFunc input_func;
  77         gpointer user_data;
  78 };
  79
  80 struct _GWeb {
  81         gint ref_count;
  82
  83         guint next_query_id;
  84
  85         int index;
  86         GList *session_list;
  87
  88         GResolv *resolv;
  89         char *accept_option;
  90         char *user_agent;
  91         gboolean close_connection;
  92
  93         GWebDebugFunc debug_func;
  94         gpointer debug_data;
  95 };
  96
  97 static inline void debug(GWeb *web, const char *format, ...)
  98 {
  99         char str[256];
 100         va_list ap;
 101
 102         if (web->debug_func == NULL)
 103                 return;
 104
 105         va_start(ap, format);
 106
 107         if (vsnprintf(str, sizeof(str), format, ap) > 0)
 108                 web->debug_func(str, web->debug_data);
 109
 110         va_end(ap);
 111 }
 112
 113 static void free_session(struct web_session *session)
 114 {
 115         GWeb *web = session->web;
 116
 117         if (session == NULL)
 118                 return;
 119
 120         g_free(session->request);
 121
 122         if (session->resolv_action > 0)
 123                 g_resolv_cancel_lookup(web->resolv, session->resolv_action);
 124
 125         if (session->transport_watch > 0)
 126                 g_source_remove(session->transport_watch);
 127
 128         if (session->send_watch > 0)
 129                 g_source_remove(session->send_watch);
 130
 131         if (session->transport_channel != NULL)
 132                 g_io_channel_unref(session->transport_channel);
 133
 134         g_string_free(session->current_header, TRUE);
 135         g_free(session->receive_buffer);
 136
 137         g_free(session->content_type);
 138
 139         g_free(session->host);
 140         g_free(session->address);
 141         g_free(session);
 142 }
 143
 144 static void flush_sessions(GWeb *web)
 145 {
 146         GList *list;
 147
 148         for (list = g_list_first(web->session_list);
 149                                         list; list = g_list_next(list))
 150                 free_session(list->data);
 151
 152         g_list_free(web->session_list);
 153         web->session_list = NULL;
 154 }
 155
 156 GWeb *g_web_new(int index)
 157 {
 158         GWeb *web;
 159
 160         if (index < 0)
 161                 return NULL;
 162
 163         web = g_try_new0(GWeb, 1);
 164         if (web == NULL)
 165                 return NULL;
 166
 167         web->ref_count = 1;
 168
 169         web->next_query_id = 1;
 170
 171         web->index = index;
 172         web->session_list = NULL;
 173
 174         web->resolv = g_resolv_new(index);
 175         if (web->resolv == NULL) {
 176                 g_free(web);
 177                 return NULL;
 178         }
 179
 180         web->accept_option = g_strdup("*/*");
 181         web->user_agent = g_strdup_printf("GWeb/%s", VERSION);
 182         web->close_connection = FALSE;
 183
 184         return web;
 185 }
 186
 187 GWeb *g_web_ref(GWeb *web)
 188 {
 189         if (web == NULL)
 190                 return NULL;
 191
 192         g_atomic_int_inc(&web->ref_count);
 193
 194         return web;
 195 }
 196
 197 void g_web_unref(GWeb *web)
 198 {
 199         if (web == NULL)
 200                 return;
 201
 202         if (g_atomic_int_dec_and_test(&web->ref_count) == FALSE)
 203                 return;
 204
 205         flush_sessions(web);
 206
 207         g_resolv_unref(web->resolv);
 208
 209         g_free(web->accept_option);
 210         g_free(web->user_agent);
 211         g_free(web);
 212 }
 213
 214 void g_web_set_debug(GWeb *web, GWebDebugFunc func, gpointer user_data)
 215 {
 216         if (web == NULL)
 217                 return;
 218
 219         web->debug_func = func;
 220         web->debug_data = user_data;
 221
 222         g_resolv_set_debug(web->resolv, func, user_data);
 223 }
 224
 225 gboolean g_web_add_nameserver(GWeb *web, const char *address)
 226 {
 227         if (web == NULL)
 228                 return FALSE;
 229
 230         g_resolv_add_nameserver(web->resolv, address, 53, 0);
 231
 232         return TRUE;
 233 }
 234
 235 static gboolean set_accept_option(GWeb *web, const char *format, va_list args)
 236 {
 237         g_free(web->accept_option);
 238
 239         if (format == NULL) {
 240                 web->accept_option = NULL;
 241                 debug(web, "clearing accept option");
 242         } else {
 243                 web->accept_option = g_strdup_vprintf(format, args);
 244                 debug(web, "setting accept %s", web->accept_option);
 245         }
 246
 247         return TRUE;
 248 }
 249
 250 gboolean g_web_set_accept(GWeb *web, const char *format, ...)
 251 {
 252         va_list args;
 253         gboolean result;
 254
 255         if (web == NULL)
 256                 return FALSE;
 257
 258         va_start(args, format);
 259         result = set_accept_option(web, format, args);
 260         va_end(args);
 261
 262         return result;
 263 }
 264
 265 static gboolean set_user_agent(GWeb *web, const char *format, va_list args)
 266 {
 267         g_free(web->user_agent);
 268
 269         if (format == NULL) {
 270                 web->user_agent = NULL;
 271                 debug(web, "clearing user agent");
 272         } else {
 273                 web->user_agent = g_strdup_vprintf(format, args);
 274                 debug(web, "setting user agent %s", web->user_agent);
 275         }
 276
 277         return TRUE;
 278 }
 279
 280 gboolean g_web_set_user_agent(GWeb *web, const char *format, ...)
 281 {
 282         va_list args;
 283         gboolean result;
 284
 285         if (web == NULL)
 286                 return FALSE;
 287
 288         va_start(args, format);
 289         result = set_user_agent(web, format, args);
 290         va_end(args);
 291
 292         return result;
 293 }
 294
 295 void g_web_set_close_connection(GWeb *web, gboolean enabled)
 296 {
 297         if (web == NULL)
 298                 return;
 299
 300         web->close_connection = enabled;
 301 }
 302
 303 gboolean g_web_get_close_connection(GWeb *web)
 304 {
 305         if (web == NULL)
 306                 return FALSE;
 307
 308         return web->close_connection;
 309 }
 310
 311 static inline void call_result_func(struct web_session *session, guint16 status)
 312 {
 313         if (session->result_func == NULL)
 314                 return;
 315
 316         if (status != 0)
 317                 session->result.status = status;
 318
 319         session->result_func(&session->result, session->user_data);
 320 }
 321
 322 static void process_next_chunk(struct web_session *session)
 323 {
 324         GString *buf;
 325         gchar *str;
 326         const guint8 *body;
 327         gsize length;
 328         gsize count, bytes_written;
 329         GIOStatus status;
 330
 331         if (session->input_func == NULL) {
 332                 session->more_data = FALSE;
 333                 return;
 334         }
 335
 336         session->more_data = session->input_func(&body, &length,
 337                                                 session->user_data);
 338
 339         buf = g_string_new(NULL);
 340
 341         if (length > 0) {
 342                 g_string_append_printf(buf, "%zx\r\n", length);
 343                 g_string_append_len(buf, (char *) body, length);
 344                 g_string_append(buf, "\r\n");
 345         }
 346
 347         if (session->more_data == FALSE)
 348                 g_string_append(buf, "0\r\n\r\n");
 349
 350         count = buf->len;
 351         str = g_string_free(buf, FALSE);
 352
 353         if (count > 0) {
 354                 status = g_io_channel_write_chars(session->transport_channel,
 355                                         str, count, &bytes_written, NULL);
 356
 357                 debug(session->web, "status %u bytes written %zu",
 358                                                 status, bytes_written);
 359         }
 360
 361         g_free(str);
 362 }
 363
 364 static void start_request(struct web_session *session)
 365 {
 366         GString *buf;
 367         gchar *str;
 368         const guint8 *body;
 369         gsize length;
 370         gsize count, bytes_written;
 371         GIOStatus status;
 372
 373         debug(session->web, "request %s from %s",
 374                                         session->request, session->host);
 375
 376         buf = g_string_new(NULL);
 377
 378         if (session->content_type == NULL)
 379                 g_string_append_printf(buf, "GET %s HTTP/1.1\r\n",
 380                                                         session->request);
 381         else
 382                 g_string_append_printf(buf, "POST %s HTTP/1.1\r\n",
 383                                                         session->request);
 384         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 385         if (session->web->user_agent != NULL)
 386                 g_string_append_printf(buf, "User-Agent: %s\r\n",
 387                                                 session->web->user_agent);
 388         if (session->web->accept_option != NULL)
 389                 g_string_append_printf(buf, "Accept: %s\r\n",
 390                                                 session->web->accept_option);
 391         if (session->content_type != NULL) {
 392                 g_string_append_printf(buf, "Content-Type: %s\r\n",
 393                                                         session->content_type);
 394                 if (session->input_func == NULL) {
 395                         session->more_data = FALSE;
 396                         length = 0;
 397                 } else
 398                         session->more_data = session->input_func(&body, &length,
 399                                                         session->user_data);
 400                 if (session->more_data == FALSE)
 401                         g_string_append_printf(buf, "Content-Length: %zu\r\n",
 402                                                                         length);
 403                 else
 404                         g_string_append(buf, "Transfer-Encoding: chunked\r\n");
 405         }
 406         if (session->web->close_connection == TRUE)
 407                 g_string_append(buf, "Connection: close\r\n");
 408         g_string_append(buf, "\r\n");
 409
 410         if (session->content_type != NULL && length > 0) {
 411                 if (session->more_data == TRUE) {
 412                         g_string_append_printf(buf, "%zx\r\n", length);
 413                         g_string_append_len(buf, (char *) body, length);
 414                         g_string_append(buf, "\r\n");
 415                 } else
 416                         g_string_append_len(buf, (char *) body, length);
 417         }
 418
 419         count = buf->len;
 420         str = g_string_free(buf, FALSE);
 421
 422         debug(session->web, "bytes to write %zu", count);
 423
 424         status = g_io_channel_write_chars(session->transport_channel,
 425                                         str, count, &bytes_written, NULL);
 426
 427         debug(session->web, "status %u bytes written %zu",
 428                                         status, bytes_written);
 429
 430         //printf("%s", str);
 431
 432         g_free(str);
 433 }
 434
 435 static gboolean send_data(GIOChannel *channel, GIOCondition cond,
 436                                                 gpointer user_data)
 437 {
 438         struct web_session *session = user_data;
 439
 440         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 441                 session->send_watch = 0;
 442                 return FALSE;
 443         }
 444
 445         if (session->request_started == FALSE) {
 446                 session->request_started = TRUE;
 447                 start_request(session);
 448         } else if (session->more_data == TRUE)
 449                 process_next_chunk(session);
 450
 451         if (session->more_data == TRUE)
 452                 return TRUE;
 453
 454         session->send_watch = 0;
 455
 456         return FALSE;
 457 }
 458
 459 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 460                                                         gpointer user_data)
 461 {
 462         struct web_session *session = user_data;
 463         guint8 *ptr = session->receive_buffer;
 464         gsize bytes_read;
 465         GIOStatus status;
 466
 467         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 468                 session->transport_watch = 0;
 469                 session->result.buffer = NULL;
 470                 session->result.length = 0;
 471                 call_result_func(session, 400);
 472                 return FALSE;
 473         }
 474
 475         status = g_io_channel_read_chars(channel,
 476                                 (gchar *) session->receive_buffer,
 477                                 session->receive_space - 1, &bytes_read, NULL);
 478
 479         debug(session->web, "bytes read %zu", bytes_read);
 480
 481         if (status != G_IO_STATUS_NORMAL) {
 482                 session->transport_watch = 0;
 483                 session->result.buffer = NULL;
 484                 session->result.length = 0;
 485                 call_result_func(session, 0);
 486                 return FALSE;
 487         }
 488
 489         session->receive_buffer[bytes_read] = '\0';
 490
 491         if (session->header_done == TRUE) {
 492                 session->result.buffer = session->receive_buffer;
 493                 session->result.length = bytes_read;
 494                 call_result_func(session, 0);
 495                 return TRUE;
 496         }
 497
 498         while (bytes_read > 0) {
 499                 guint8 *pos;
 500                 gsize count;
 501                 char *str;
 502
 503                 pos = memchr(ptr, '\n', bytes_read);
 504                 if (pos == NULL) {
 505                         g_string_append_len(session->current_header,
 506                                                 (gchar *) ptr, bytes_read);
 507                         return TRUE;
 508                 }
 509
 510                 *pos = '\0';
 511                 count = strlen((char *) ptr);
 512                 if (count > 0 && ptr[count - 1] == '\r') {
 513                         ptr[--count] = '\0';
 514                         bytes_read--;
 515                 }
 516
 517                 g_string_append_len(session->current_header,
 518                                                 (gchar *) ptr, count);
 519
 520                 bytes_read -= count + 1;
 521                 ptr = pos + 1;
 522
 523                 if (session->current_header->len == 0) {
 524                         session->header_done = TRUE;
 525                         session->result.buffer = pos + 1;
 526                         session->result.length = bytes_read;
 527                         call_result_func(session, 0);
 528                         break;
 529                 }
 530
 531                 str = session->current_header->str;
 532
 533                 if (session->result.status == 0) {
 534                         unsigned int code;
 535
 536                         if (sscanf(str, "HTTP/%*s %u %*s", &code) == 1)
 537                                 session->result.status = code;
 538                 }
 539
 540                 debug(session->web, "[header] %s", str);
 541
 542                 g_string_truncate(session->current_header, 0);
 543         }
 544
 545         return TRUE;
 546 }
 547
 548 static int connect_session_transport(struct web_session *session)
 549 {
 550         struct sockaddr_in sin;
 551         int sk;
 552
 553         sk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 554         if (sk < 0)
 555                 return -EIO;
 556
 557         memset(&sin, 0, sizeof(sin));
 558         sin.sin_family = AF_INET;
 559         sin.sin_port = htons(session->port);
 560         sin.sin_addr.s_addr = inet_addr(session->address);
 561
 562         if (session->flags & SESSION_FLAG_USE_TLS)
 563                 session->transport_channel = g_io_channel_gnutls_new(sk);
 564         else
 565                 session->transport_channel = g_io_channel_unix_new(sk);
 566
 567         if (session->transport_channel == NULL) {
 568                 close(sk);
 569                 return -ENOMEM;
 570         }
 571
 572         g_io_channel_set_flags(session->transport_channel,
 573                                         G_IO_FLAG_NONBLOCK, NULL);
 574         g_io_channel_set_encoding(session->transport_channel, NULL, NULL);
 575         g_io_channel_set_buffered(session->transport_channel, FALSE);
 576
 577         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
 578
 579         if (connect(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 580                 if (errno != EINPROGRESS) {
 581                         close(sk);
 582                         return -EIO;
 583                 }
 584         }
 585
 586         session->transport_watch = g_io_add_watch(session->transport_channel,
 587                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 588                                                 received_data, session);
 589
 590         session->send_watch = g_io_add_watch(session->transport_channel,
 591                                 G_IO_OUT | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 592                                                 send_data, session);
 593
 594         return 0;
 595 }
 596
 597 static int create_transport(struct web_session *session)
 598 {
 599         int err;
 600
 601         err = connect_session_transport(session);
 602         if (err < 0)
 603                 return err;
 604
 605         debug(session->web, "creating session %s:%u",
 606                                         session->address, session->port);
 607
 608         return 0;
 609 }
 610
 611 static int parse_url(struct web_session *session, const char *url)
 612 {
 613         char *scheme, *host, *port, *path;
 614
 615         scheme = g_strdup(url);
 616         if (scheme == NULL)
 617                 return -EINVAL;
 618
 619         host = strstr(scheme, "://");
 620         if (host != NULL) {
 621                 *host = '\0';
 622                 host += 3;
 623
 624                 if (strcasecmp(scheme, "https") == 0) {
 625                         session->port = 443;
 626                         session->flags |= SESSION_FLAG_USE_TLS;
 627                 } else if (strcasecmp(scheme, "http") == 0) {
 628                         session->port = 80;
 629                 } else {
 630                         g_free(scheme);
 631                         return -EINVAL;
 632                 }
 633         } else {
 634                 host = scheme;
 635                 session->port = 80;
 636         }
 637
 638         path = strchr(host, '/');
 639         if (path != NULL)
 640                 *(path++) = '\0';
 641
 642         session->request = g_strdup_printf("/%s", path ? path : "");
 643
 644         port = strrchr(host, ':');
 645         if (port != NULL) {
 646                 char *end;
 647                 int tmp = strtol(port + 1, &end, 10);
 648
 649                 if (*end == '\0') {
 650                         *port = '\0';
 651                         session->port = tmp;
 652                 }
 653         }
 654
 655         session->host = g_strdup(host);
 656
 657         g_free(scheme);
 658
 659         return 0;
 660 }
 661
 662 static void resolv_result(GResolvResultStatus status,
 663                                         char **results, gpointer user_data)
 664 {
 665         struct web_session *session = user_data;
 666
 667         if (results == NULL || results[0] == NULL) {
 668                 call_result_func(session, 404);
 669                 return;
 670         }
 671
 672         debug(session->web, "address %s", results[0]);
 673
 674         if (inet_aton(results[0], NULL) == 0) {
 675                 call_result_func(session, 400);
 676                 return;
 677         }
 678
 679         session->address = g_strdup(results[0]);
 680
 681         if (create_transport(session) < 0) {
 682                 call_result_func(session, 409);
 683                 return;
 684         }
 685 }
 686
 687 static guint do_request(GWeb *web, const char *url,
 688                                 const char *type, GWebInputFunc input,
 689                                 GWebResultFunc func, gpointer user_data)
 690 {
 691         struct web_session *session;
 692
 693         if (web == NULL || url == NULL)
 694                 return 0;
 695
 696         debug(web, "request %s", url);
 697
 698         session = g_try_new0(struct web_session, 1);
 699         if (session == NULL)
 700                 return 0;
 701
 702         if (parse_url(session, url) < 0) {
 703                 free_session(session);
 704                 return 0;
 705         }
 706
 707         debug(web, "host %s:%u", session->host, session->port);
 708         debug(web, "flags %lu", session->flags);
 709
 710         if (type != NULL) {
 711                 session->content_type = g_strdup(type);
 712
 713                 debug(web, "content-type %s", session->content_type);
 714         }
 715
 716         session->web = web;
 717
 718         session->result_func = func;
 719         session->input_func = input;
 720         session->user_data = user_data;
 721
 722         session->receive_buffer = g_try_malloc(DEFAULT_BUFFER_SIZE);
 723         if (session->receive_buffer == NULL) {
 724                 free_session(session);
 725                 return 0;
 726         }
 727
 728         session->receive_space = DEFAULT_BUFFER_SIZE;
 729         session->current_header = g_string_sized_new(0);
 730         session->header_done = FALSE;
 731
 732         if (inet_aton(session->host, NULL) == 0) {
 733                 session->resolv_action = g_resolv_lookup_hostname(web->resolv,
 734                                         session->host, resolv_result, session);
 735                 if (session->resolv_action == 0) {
 736                         free_session(session);
 737                         return 0;
 738                 }
 739         } else {
 740                 session->address = g_strdup(session->host);
 741
 742                 if (create_transport(session) < 0) {
 743                         free_session(session);
 744                         return 0;
 745                 }
 746         }
 747
 748         web->session_list = g_list_append(web->session_list, session);
 749
 750         return web->next_query_id++;
 751 }
 752
 753 guint g_web_request_get(GWeb *web, const char *url,
 754                                 GWebResultFunc func, gpointer user_data)
 755 {
 756         return do_request(web, url, NULL, NULL, func, user_data);
 757 }
 758
 759 guint g_web_request_post(GWeb *web, const char *url,
 760                                 const char *type, GWebInputFunc input,
 761                                 GWebResultFunc func, gpointer user_data)
 762 {
 763         return do_request(web, url, type, input, func, user_data);
 764 }
 765
 766 gboolean g_web_cancel_request(GWeb *web, guint id)
 767 {
 768         if (web == NULL)
 769                 return FALSE;
 770
 771         return TRUE;
 772 }
 773
 774 guint16 g_web_result_get_status(GWebResult *result)
 775 {
 776         if (result == NULL)
 777                 return 0;
 778
 779         return result->status;
 780 }
 781
 782 gboolean g_web_result_get_chunk(GWebResult *result,
 783                                 const guint8 **chunk, gsize *length)
 784 {
 785         if (result == NULL)
 786                 return FALSE;
 787
 788         if (chunk == NULL)
 789                 return FALSE;
 790
 791         *chunk = result->buffer;
 792
 793         if (length != NULL)
 794                 *length = result->length;
 795
 796         return TRUE;
 797 }
 798
 799 struct _GWebParser {
 800         gint ref_count;
 801         char *begin_token;
 802         char *end_token;
 803         const char *token_str;
 804         size_t token_len;
 805         size_t token_pos;
 806         gboolean intoken;
 807         GString *content;
 808         GWebParserFunc func;
 809         gpointer user_data;
 810 };
 811
 812 GWebParser *g_web_parser_new(const char *begin, const char *end,
 813                                 GWebParserFunc func, gpointer user_data)
 814 {
 815         GWebParser *parser;
 816
 817         parser = g_try_new0(GWebParser, 1);
 818         if (parser == NULL)
 819                 return NULL;
 820
 821         parser->ref_count = 1;
 822
 823         parser->begin_token = g_strdup(begin);
 824         parser->end_token = g_strdup(end);
 825
 826         if (parser->begin_token == NULL) {
 827                 g_free(parser);
 828                 return NULL;
 829         }
 830
 831         parser->func = func;
 832         parser->user_data = user_data;
 833
 834         parser->token_str = parser->begin_token;
 835         parser->token_len = strlen(parser->token_str);
 836         parser->token_pos = 0;
 837
 838         parser->intoken = FALSE;
 839         parser->content = g_string_sized_new(0);
 840
 841         return parser;
 842 }
 843
 844 GWebParser *g_web_parser_ref(GWebParser *parser)
 845 {
 846         if (parser == NULL)
 847                 return NULL;
 848
 849         g_atomic_int_inc(&parser->ref_count);
 850
 851         return parser;
 852 }
 853
 854 void g_web_parser_unref(GWebParser *parser)
 855 {
 856         if (parser == NULL)
 857                 return;
 858
 859         if (g_atomic_int_dec_and_test(&parser->ref_count) == FALSE)
 860                 return;
 861
 862         g_string_free(parser->content, TRUE);
 863
 864         g_free(parser->begin_token);
 865         g_free(parser->end_token);
 866         g_free(parser);
 867 }
 868
 869 void g_web_parser_feed_data(GWebParser *parser,
 870                                 const guint8 *data, gsize length)
 871 {
 872         const guint8 *ptr = data;
 873
 874         if (parser == NULL)
 875                 return;
 876
 877         while (length > 0) {
 878                 guint8 chr = parser->token_str[parser->token_pos];
 879
 880                 if (parser->token_pos == 0) {
 881                         guint8 *pos;
 882
 883                         pos = memchr(ptr, chr, length);
 884                         if (pos == NULL) {
 885                                 if (parser->intoken == TRUE)
 886                                         g_string_append_len(parser->content,
 887                                                         (gchar *) ptr, length);
 888                                 break;
 889                         }
 890
 891                         if (parser->intoken == TRUE)
 892                                 g_string_append_len(parser->content,
 893                                                 (gchar *) ptr, (pos - ptr) + 1);
 894
 895                         length -= (pos - ptr) + 1;
 896                         ptr = pos + 1;
 897
 898                         parser->token_pos++;
 899                         continue;
 900                 }
 901
 902                 if (parser->intoken == TRUE)
 903                         g_string_append_c(parser->content, ptr[0]);
 904
 905                 if (ptr[0] != chr) {
 906                         length--;
 907                         ptr++;
 908
 909                         parser->token_pos = 0;
 910                         continue;
 911                 }
 912
 913                 length--;
 914                 ptr++;
 915
 916                 parser->token_pos++;
 917
 918                 if (parser->token_pos == parser->token_len) {
 919                         if (parser->intoken == FALSE) {
 920                                 g_string_append(parser->content,
 921                                                         parser->token_str);
 922
 923                                 parser->intoken = TRUE;
 924                                 parser->token_str = parser->end_token;
 925                                 parser->token_len = strlen(parser->end_token);
 926                                 parser->token_pos = 0;
 927                         } else {
 928                                 char *str;
 929                                 str = g_string_free(parser->content, FALSE);
 930                                 parser->content = g_string_sized_new(0);
 931                                 if (parser->func)
 932                                         parser->func(str, parser->user_data);
 933                                 g_free(str);
 934
 935                                 parser->intoken = FALSE;
 936                                 parser->token_str = parser->begin_token;
 937                                 parser->token_len = strlen(parser->begin_token);
 938                                 parser->token_pos = 0;
 939                         }
 940                 }
 941         }
 942 }
 943
 944 void g_web_parser_end_data(GWebParser *parser)
 945 {
 946         if (parser == NULL)
 947                 return;
 948 }