home *** CD-ROM | disk | FTP | other *** search
- /*
- How to build: (callback.so or callback.dll)
- With GNU-GCC:
- gcc -O -g3 -Wall -D_REENTRANT -shared -o mycallback.so callbacks-example.c -lhttrack1
- With MS-Visual C++:
- cl -LD -nologo -W3 -Zi -Zp4 -DWIN32 -Fe"mycallback.dll" callbacks-example.c libhttrack1.lib
-
- Note: the httrack library linker option is only necessary when using libhttrack's functions inside the callback
-
- How to use:
- httrack --wrapper mycallback,string1,string2 ..
- */
-
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
-
- /* Standard httrack module includes */
- #include "httrack-library.h"
- #include "htsopt.h"
- #include "htsdefines.h"
-
- /* Function definitions */
- static int mysavename(t_hts_callbackarg *carg, httrackp *opt, const char* adr_complete, const char* fil_complete, const char* referer_adr, const char* referer_fil, char* save);
- static int myend(t_hts_callbackarg *carg, httrackp *opt);
-
- /* TOLOWER */
- #define TOLOWER_(a) (a >= 'A' && a <= 'Z') ? (a + ('a' - 'A')) : a
- #define TOLOWER(a) ( TOLOWER_( (a) ) )
-
- /*
- This sample just replaces all occurences of "string1" into "string2"
- string1 and string2 are passed in the callback string:
- httrack --wrapper save-name=callback:mysavename,string1,string2 ..
- */
-
- typedef struct t_my_userdef {
- char string1[256];
- char string2[256];
- } t_my_userdef;
-
- /*
- module entry point
- */
- EXTERNAL_FUNCTION int hts_plug(t_hts_callbackarg *carg, httrackp *opt, const char* argv) {
- const char *arg = strchr(argv, ',');
- if (arg != NULL)
- arg++;
-
- /* Check args */
- if (arg == NULL || *arg == '\0' || strchr(arg, ',') == NULL) {
- fprintf(stderr, "** callback error: arguments expected or bad arguments\n");
- fprintf(stderr, "usage: httrack --wrapper save-name=callback:mysavename,string1,string2\n");
- fprintf(stderr, "example: httrack --wrapper save-name=callback:mysavename,foo,bar\n");
- return 0; /* failed */
- } else {
- char *pos = strchr(arg, ',');
- t_my_userdef *userdef = (t_my_userdef*) malloc(sizeof(t_my_userdef));
- char * const string1 = userdef->string1;
- char * const string2 = userdef->string2;
-
- /* Split args */
- fprintf(stderr, "** info: wrapper_init(%s) called!\n", arg);
- fprintf(stderr, "** callback example: changing destination filename word by another one\n");
- string1[0] = string1[1] = '\0';
- strncat(string1, arg, pos - arg);
- strcpy(string2, pos + 1);
- fprintf(stderr, "** callback info: will replace %s by %s in filenames!\n", string1, string2);
-
- /* Plug callback functions */
- CHAIN_FUNCTION(opt, savename, mysavename, userdef);
- CHAIN_FUNCTION(opt, end, myend, userdef);
- }
-
- return 1; /* success */
- }
-
- static int myend(t_hts_callbackarg *carg, httrackp *opt) {
- t_my_userdef *userdef = (t_my_userdef*) CALLBACKARG_USERDEF(carg);
-
- fprintf(stderr, "** info: wrapper_exit() called!\n");
- if (userdef != NULL) {
- free(userdef);
- userdef = NULL;
- }
-
- /* Call parent functions if multiple callbacks are chained. */
- if (CALLBACKARG_PREV_FUN(carg, end) != NULL) {
- return CALLBACKARG_PREV_FUN(carg, end)(CALLBACKARG_PREV_CARG(carg), opt);
- }
-
- return 1; /* success */
- }
-
- static int mysavename(t_hts_callbackarg *carg, httrackp *opt, const char* adr_complete, const char* fil_complete, const char* referer_adr, const char* referer_fil, char* save) {
- t_my_userdef *userdef = (t_my_userdef*) CALLBACKARG_USERDEF(carg);
- char * const string1 = userdef->string1;
- char * const string2 = userdef->string2;
- /* */
- char *buff, *a, *b;
-
- /* Call parent functions if multiple callbacks are chained. */
- if (CALLBACKARG_PREV_FUN(carg, savename) != NULL) {
- if (!CALLBACKARG_PREV_FUN(carg, savename)(CALLBACKARG_PREV_CARG(carg), opt, adr_complete, fil_complete, referer_adr, referer_fil, save)) {
- return 0; /* Abort */
- }
- }
-
- /* Process */
- buff = strdup(save);
- a = buff;
- b = save;
- *b = '\0'; /* the "save" variable points to a buffer with "sufficient" space */
- while(*a) {
- if (strncmp(a, string1, (int)strlen(string1)) == 0) {
- strcat(b, string2);
- b += strlen(b);
- a += strlen(string1);
- } else {
- *b++ = *a++;
- *b = '\0';
- }
- }
- free(buff);
-
- return 1; /* success */
- }
-