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/* See COPYING file for copyright and license details. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "util.h"
#define usage "getgbook " VERSION " - a google books downloader\n" \
"usage: getgbook [-] bookid\n" \
" - download pages from stdin\n" \
" otherwise, all available pages will be downloaded\n"
#define URLMAX 1024
#define STRMAX 1024
#define PGCODELEN 3
#define RETRYNUM 5
#define COOKIENUM 5
typedef struct {
int num;
char url[URLMAX];
char name[STRMAX];
} Page;
char pagecodes[][PGCODELEN] = { "PP", "PR", "PA", "PT", "\0" };
int getpagelist(char *bookid, Page **pages)
{
char url[URLMAX];
char *buf;
char *s;
int i;
Page *p;
snprintf(url, URLMAX, "/books?id=%s&printsec=frontcover", bookid);
if(!get("books.google.com", url, NULL, NULL, &buf))
return -1;
if((s = strstr(buf, "_OC_Run({\"page\":[")) == NULL)
return -1;
s+=strlen("_OC_Run({\"page\":[");
for(i=0, p=pages[0];*s; s++) {
if(*s == ']')
break;
if(!strncmp(s, "\"pid\"", 5)) {
sscanf(s+6, "\"%[^\"]\",", p->name);
for(;*s; s++) {
if(*s == '}')
break;
if(!strncmp(s, "\"order\"", 7))
sscanf(s+8, "%d,", &(p->num));
}
p=pages[++i];
}
}
return i;
}
Page *getpagedetail(char *bookid, char *pg, char *cookie)
{
char url[URLMAX], m[STRMAX];
char *c, *d, *p, *buf = NULL;
Page *page;
snprintf(url, URLMAX, "/books?id=%s&pg=%s&jscmd=click3&q=subject:a", bookid, pg);
if(!get("books.google.com", url, cookie, NULL, &buf))
return NULL;
snprintf(m, STRMAX, "\"pid\":\"%s\"", pg);
if(!(c = strstr(buf,m)))
return NULL;
page = malloc(sizeof(*page));
strncpy(page->name, pg, STRMAX);
page->url[0] = '\0';
page->num = -1;
if(!strncmp(c+strlen(m)+1, "\"src\"", 5)) {
for(p=page->url, d=c+strlen(m)+8; *d && *d != '"'; d++, p++) {
if(!strncmp(d, "\\u0026", 6)) {
*p = '&';
d+=5;
} else
*p = *d;
}
strncpy(p, "&q=subject:a", 12);
} else
d=c;
for(; *d; d++) {
if(*d == '}') {
break;
}
if(!strncmp(d, "\"order\"", 7)) {
sscanf(d+8, "%d,", &(page->num));
break;
}
}
free(buf);
return page;
}
int main(int argc, char *argv[])
{
char *bookid, *tmp, cookies[COOKIENUM][COOKIEMAX];
int i, a;
if(argc < 2 || argc > 3 || (argc == 3 && argv[1][0]!='-')) {
fputs(usage, stdout);
return 1;
}
/* get cookies */
for(i=0;i<COOKIENUM;i++) {
if(get("books.google.com", "/", NULL, cookies[i], &tmp))
free(tmp);
}
bookid = argv[argc-1];
if(argc == 2) {
/* download all pages */
/* - fill page struct with names & nums
* - loop through each struct
* - if there's not a file matching num, try downloading, if dl failure, try with a different cookie */
/*
cookie management:
use up to 5 cookies. (number might change)
complexity comes with a page which is not available; that shouldn't cause us to use up all the cookies
so:
- save 5 cookies immediately
- use first until it fails
- then use next. if it succeeds, drop previous. if not, try next, etc. if all failed, don't drop any, and continue to next page, and +1 to retry
- maybe: when retry is 5, quit as it looks like we won't get anything more from any cookies
*/
Page **page;
page = malloc(sizeof(*page) * 1000);
for(i=0; i<1000; i++) page[i] = malloc(sizeof(**page));
if(!(i = getpagelist(bookid, page))) {
fprintf(stderr, "Could not find pages for %s\n", bookid);
return 1;
}
for(a=0; a<i; a++)
printf("page name: %s page num: %d\n", page[a]->name, page[a]->num);
}
return EXIT_SUCCESS;
}
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