1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/* See COPYING file for copyright, license and warranty details. */
#include <unistd.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
void die(char *msg) {
fputs(msg, stderr);
exit(EXIT_FAILURE);
}
/* plundered from suckless' sic */
static int dial(char *host, char *port) {
static struct addrinfo hints;
int srv;
struct addrinfo *res, *r;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
if(getaddrinfo(host, port, &hints, &res) != 0)
die("error: cannot resolve hostname\n");
for(r = res; r; r = r->ai_next) {
if((srv = socket(r->ai_family, r->ai_socktype, r->ai_protocol)) == -1)
continue;
if(connect(srv, r->ai_addr, r->ai_addrlen) == 0)
break;
close(srv);
}
freeaddrinfo(res);
if(!r)
die("error: cannot connect to host\n");
return srv;
}
int get(char *host, char *path, char **gotbuf) {
size_t l, res;
int fd, i;
char *buf;
char h[1024] = "\0";
FILE *srv;
fd = dial(host, "80");
srv = fdopen(fd, "r+");
fprintf(srv, "GET %s HTTP/1.0\r\nUser-Agent: getgbook-"VERSION \
" (not mozilla)\r\nHost: %s\r\n\r\n", path, host);
fflush(srv);
/* process headers */
while(h[0] != '\r') {
fgets(h, 1024, srv);
if(sscanf(h, "HTTP/%d.%d %d", &i, &i, &l) == 3 && l != 200)
return 1;
}
buf = malloc(sizeof(char *) * 4096);
for(i=0, l=0; (res = fread(buf+l, 1, 4096, srv)) > 0; l+=res, i++)
buf = realloc(buf, sizeof(char *) * (l+4096));
*gotbuf = buf;
return l;
}
int gettofile(char *url, char *savepath) {
char *buf = 0;
FILE *f;
size_t i, l;
if(!(l = get("books.google.com", url, &buf))) {
fprintf(stderr, "Could not download %s\n", url);
return 1;
}
if((f = fopen(savepath, "w")) == NULL) {
fprintf(stderr, "Could not create file %s\n", savepath);
return 1;
}
for(i=0; i < l; i+=512)
if(!fwrite(buf+i, l-i > 512 ? 512 : l-i, 1, f)) {
fprintf(stderr, "Error writing file %s\n", savepath);
free(buf); fclose(f);
return 1;
}
free(buf);
fclose(f);
return 0;
}
|
