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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)
{
/* TODO */
/*http://books.google.com/books?id=h3DSQ0L10o8C&printsec=frontcover*/
return 1;
}
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, *code, cookies[COOKIENUM][COOKIEMAX];
char pg[STRMAX], buf[BUFSIZ], n[STRMAX], cookie[COOKIEMAX] = "";
int i, c, retry;
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[10000];
if(!getpagelist(bookid, page)) {
fprintf(stderr, "Could not find pages for %s\n", bookid);
return 1;
}
/* OLD CODE */
code = pagecodes[0];
c = i = retry = 0;
while(++i) {
snprintf(pg, STRMAX, "%s%d", code, i);
if(!(page = getpagedetail(bookid, pg, cookie))) {
/* no more pages with that code */
code = pagecodes[++c];
if(code[0] == '\0') break;
i=0;
continue;
}
if(!page->url[0]) {
free(page);
/* try with fresh cookie */
if(retry < RETRYNUM) {
get("books.google.com", "/", NULL, cookie, &tmp);
free(tmp);
retry++;
i--;
} else {
fprintf(stderr, "%s not available\n", pg);
retry=0;
}
continue;
}
retry=0;
if(argv[1][1] == 'a') {
if(page->num != -1)
snprintf(n, STRMAX, "%04d.png", page->num);
else
snprintf(n, STRMAX, "%s.png", page->name);
if(gettofile("books.google.com", page->url, cookie, NULL, n))
fprintf(stderr, "%s failed\n", pg);
else
printf("Downloaded page %d\n", page->num);
} else {
printf("%s ", page->name);
if(page->num != -1) printf("%d", page->num);
printf("\n");
fflush(stdout);
}
free(page);
}
} else {
/* download pages from stdin */
/* TODO: rewrite using cookies as above */
Page *page;
while(fgets(buf, BUFSIZ, stdin)) {
sscanf(buf, "%15s", pg);
for(retry = 0; retry < RETRYNUM; retry++) {
get("books.google.com", "/", NULL, cookie, &tmp);
if((page = getpagedetail(bookid, pg, cookie)) && page->url[0]) {
snprintf(n, STRMAX, "%04d.png", page->num);
if(gettofile("books.google.com", page->url, cookie, NULL, n))
continue;
printf("Downloaded page %d\n", page->num);
free(page);
break;
}
if(page) free(page);
}
if(retry == RETRYNUM)
fprintf(stderr, "%s failed\n", pg);
}
}
return EXIT_SUCCESS;
}
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