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/* See COPYING file for copyright, license and warranty details. */
#define VERSION "prealpha"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "util.c"
#define usage "getgbook " VERSION " - a google books downloader\n" \
"usage: getgbook [-p|-a] isbn\n" \
" -p print all available pages\n" \
" -a download all available pages\n" \
" otherwise, all pages in stdin will be downloaded\n"
#define hostname "books.google.com"
#define URLMAX 1024
#define BOOKID_LEN 12
typedef struct {
char *name;
char *code;
} pgtype;
pgtype pgtypes[] = {
{"cover", "PP"},
{"preface", "PR"},
{"page", "PA"},
{"postface", "PA"},
};
char *getbookid(char *isbn)
{
char url[URLMAX];
int i;
FILE *srv;
char *buf, *bookid, *c;
i = dial("books.google.com", "80");
srv = fdopen(i, "r+");
/* NOTE: new api returns json, and looks like this:
* http://www.googleapis.com/books/v1/volumes?q=isbn:1589235126
* (this needs https, which we don't yet support) */
snprintf(url, URLMAX, "/books/feeds/volumes?q=isbn:%s", isbn);
bookid = malloc(sizeof(char *) * BOOKID_LEN);
if((buf = get(srv, "books.google.com", url)) == NULL)
return NULL;
if((c = strstr(buf,"<dc:identifier>")) == NULL)
return NULL;
strncpy(bookid, c+15, BOOKID_LEN);
bookid[BOOKID_LEN] = '\0';
free(buf);
return bookid;
}
char *getpageurl(char *bookid, char *pagetype, int pagenum)
{
char url[URLMAX];
int i, l;
FILE *srv;
char *buf, *c, *d, m[80], *pageurl;
i = dial("books.google.com", "80");
srv = fdopen(i, "r+");
snprintf(url, URLMAX, "/books?id=%s&pg=%s%i&jscmd=click3", bookid, pagetype, pagenum);
if((buf = get(srv, "books.google.com", url)) == NULL)
return NULL;
snprintf(m, 80, "\"pid\":\"%s%i\"", pagetype, pagenum);
if((c = strstr(buf,m)) == NULL)
return NULL;
if(strncmp(c+strlen(m)+1, "\"src\"", 5) != 0)
return NULL;
for(l=0, d=c+strlen(m)+8; *d && *d != '"'; *d++, l++);
pageurl = malloc(sizeof(char *) * l);
strncpy(pageurl, c+strlen(m)+8, l);
pageurl[l] = '\0';
free(buf);
return pageurl;
}
int main(int argc, char *argv[])
{
char *bookid, *url;
if(argc < 2 || argc > 3)
die(usage);
if(argv[1][0] == '-') {
if((argv[1][1] != 'p' && argv[1][1] != 'a') || argc < 3)
die(usage);
if((bookid = getbookid(argv[2])) == NULL)
die("Could not find book\n");
printf("bookid is %s\n", bookid);
} else {
if((bookid = getbookid(argv[1])) == NULL)
die("Could not find book\n");
printf("bookid is %s\n", bookid);
if((url = getpageurl(bookid, "PA", 2)) != NULL)
printf("page 2 url is %s\n", url);
else
fprintf(stderr, "Could not find page %s %i\n", "PA", 2);
}
free(bookid);
free(url);
return EXIT_SUCCESS;
}
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