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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 [-c|-n] bookid\n" \
" -c download pages from codes in stdin (TODO)\n" \
" -n download pages from numbers in stdin (TODO)\n" \
" otherwise, all available pages will be downloaded\n"
#define URLMAX 1024
#define STRMAX 1024
#define MAXPAGES 9999
#define COOKIENUM 5
typedef struct {
int num;
char url[URLMAX];
char name[STRMAX];
char cookie[COOKIEMAX];
} Page;
int getpagelist(char *bookid, Page **pages)
{
char url[URLMAX], m[STRMAX];
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 0;
if((s = strstr(buf, "_OC_Run({\"page\":[")) == NULL)
return 0;
s+=strlen("_OC_Run({\"page\":[");
for(i=0, p=pages[0];*s; s++) {
p->url[0] = '\0';
if(*s == ']')
break;
if(!strncmp(s, "\"pid\"", 5)) {
snprintf(m, STRMAX, "\"%%%d[^\"]\"", STRMAX-1);
sscanf(s+6, m, p->name);
for(;*s; s++) {
if(*s == '}')
break;
if(!strncmp(s, "\"order\"", 7))
sscanf(s+8, "%d,", &(p->num));
}
p=pages[++i];
}
}
return i;
}
int getpageurls(char *bookid, Page **pages, int totalpages, char *pagecode, char *cookie) {
char url[URLMAX], code[STRMAX], m[STRMAX];
char *c, *d, *p, *buf = NULL;
int i;
snprintf(url, URLMAX, "/books?id=%s&pg=%s&jscmd=click3&q=subject:a", bookid, pagecode);
if(!get("books.google.com", url, cookie, NULL, &buf))
return 1;
c = buf;
while(*c && (c = strstr(c, "\"pid\":"))) {
snprintf(m, STRMAX, "\"pid\":\"%%%d[^\"]\"", STRMAX-1);
if(!sscanf(c, m, code))
break;
for(; *c; c++) {
if(*c == '}') {
break;
}
if(!strncmp(c, "\"src\"", 5)) {
for(i=0; i<totalpages; i++)
if(!strncmp(pages[i]->name, code, STRMAX))
break;
for(p=pages[i]->url, d=c+strlen("\"src\":")+1; *d && *d != '"'; d++, p++) {
if(!strncmp(d, "\\u0026", 6)) {
*p = '&';
d+=5;
} else
*p = *d;
}
strncpy(p, "&q=subject:a", 13);
strncpy(pages[i]->cookie, cookie, COOKIEMAX);
break;
}
}
}
free(buf);
return 0;
}
int main(int argc, char *argv[])
{
char *bookid, *tmp, cookies[COOKIENUM][COOKIEMAX];
char pgpath[STRMAX];
int a, i, j, totalpages;
FILE *f;
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) {
Page **page;
page = malloc(sizeof(*page) * MAXPAGES);
for(i=0; i<MAXPAGES; i++) page[i] = malloc(sizeof(**page));
if(!(totalpages = getpagelist(bookid, page))) {
fprintf(stderr, "Could not find any pages for %s\n", bookid);
return 1;
}
for(i=0; i<totalpages; i++) {
snprintf(pgpath, STRMAX, "%04d.png", page[i]->num);
if((f = fopen(pgpath, "r")) != NULL) {
fclose(f);
continue;
}
if(page[i]->url[0] == '\0') {
for(j=0; j<COOKIENUM; j++) {
if(cookies[j][0] == '\0') /* dead cookie */
continue;
getpageurls(bookid, page, totalpages, page[i]->name, cookies[j]);
if(page[i]->url[0] != '\0') {
/* invalidate old cookies if one succeeded */
for(a=0; a<j; a++)
cookies[a][0] = '\0';
break;
}
}
}
if(page[i]->url[0] == '\0')
fprintf(stderr, "%s not found\n", page[i]->name);
else {
if(gettofile("books.google.com", page[i]->url, page[i]->cookie, NULL, pgpath))
fprintf(stderr, "%s failed\n", page[i]->name);
else
printf("%d downloaded\n", page[i]->num);
}
}
}
return EXIT_SUCCESS;
}
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