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#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <unistd.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "package.h"
struct package_item;
struct package_item {
char *name;
char *path;
struct package_item *next;
};
struct package {
char *base;
int count;
struct package_item *items;
struct package_item *last;
};
static int copy(FILE *f, FILE *t, uint32_t len) {
static char buf[2048*4];
while (len > 0) {
uint32_t n;
if (feof(f))
return -1;
n = len > sizeof(buf) ? sizeof(buf) : len;
if (fread(buf, n, 1, f) != 1)
return -1;
if (fwrite(buf, n, 1, t) != 1)
return -1;
len -= n;
}
return 0;
}
static char *tmp(char *fn, int l) {
char *t;
if (!(t = getenv("TMPDIR")))
if (!(t = getenv("TEMP")))
if (!(t = getenv("TMP")))
t = "/tmp";
snprintf(fn, l, "%s/pkgXXXXXX", t);
return fn;
}
static struct package_item *item_new(const char *name, const char *path) {
struct package_item *i = NULL;
if (!(i = malloc(sizeof(struct package_item))))
return NULL;
memset(i, 0, sizeof(struct package_item));
if (!(i->name = strdup(name)))
goto fail;
if (!(i->path = strdup(path)))
goto fail;
return i;
fail:
if(i) {
if (i->path)
free(i->path);
if (i->name)
free(i->name);
free(i);
}
return NULL;
}
struct package* package_open(const char *fn) {
struct package *p;
FILE *f = NULL;
char path[PATH_MAX];
if (!(p = malloc(sizeof(struct package)))) {
fprintf(stderr, "Failed to allocate package structure.\n");
return NULL;
}
memset(p, 0, sizeof(struct package));
tmp(path, sizeof(path));
if (!mkdtemp(path)) {
fprintf(stderr, "Failed to create temporary directory.\n");
goto finish;
}
if (!(p->base = strdup(path))) {
fprintf(stderr, "Failed to allocate memory.\n");
goto finish;
}
if (fn) {
if (!(f = fopen(fn, "r"))) {
fprintf(stderr, "Failed to open <%s>: %s\n", fn, strerror(errno));
goto finish;
}
for (;;) {
uint32_t len;
char name[PACKAGE_ITEM_NAME_LEN+1];
FILE *d = NULL;
struct package_item *pi;
if (!fread(name, sizeof(name)-1, 1, f))
break;
name[sizeof(name)-1] = 0;
if (fread(&len, sizeof(len), 1, f) != 1) {
fprintf(stderr, "Short read while reading length: %s\n", strerror(errno));
goto finish;
}
snprintf(path, sizeof(path), "%s/%i", p->base, p->count++);
if (!(d = fopen(path, "w+"))) {
fprintf(stderr, "Failed to open target file: %s\n", strerror(errno));
goto finish;
}
if (copy(f, d, len) < 0) {
fprintf(stderr, "Copy failed: %s\n", strerror(errno));
fclose(d);
unlink(path);
goto finish;
}
fclose(d);
if (!(pi = item_new(name, path))) {
unlink(path);
fprintf(stderr, "Failed to allocate memory.\n");
goto finish;
}
assert(!!p->last == !!p->items);
if (p->last) {
p->last->next = pi;
p->last = pi;
} else
p->items = p->last = pi;
}
fclose(f);
}
return p;
finish:
if (f)
fclose(f);
if (p)
package_remove(p);
return NULL;
}
int package_save(struct package *p, const char *fn) {
FILE *f, *s = NULL;
int r = 0;
struct package_item *i;
assert(p && fn);
if (!(f = fopen(fn, "w+")))
return -1;
for (i = p->items; i; i = i->next) {
char name[PACKAGE_ITEM_NAME_LEN+1];
uint32_t len;
struct stat st;
if (!i->name || !i->path)
continue;
if (!(s = fopen(i->path, "r")))
continue;
//fprintf(stderr, "Saving %s (%s)...\n", i->name, i->path);
memset(name, 0, sizeof(name));
strncpy(name, i->name, sizeof(name)-1);
if (fwrite(name, sizeof(name)-1, 1, f) != 1) {
r = 1;
break;
}
if (fstat(fileno(s), &st) < 0) {
fprintf(stderr, "Could not get file size: %s\n", strerror(errno));
r = 1;
break;
}
len = st.st_size;
if (fwrite(&len, sizeof(len), 1, f) != 1) {
r = 1;
break;
}
if (copy(s, f, len) < 0) {
fprintf(stderr, "Could not copy file to package: %s\n", strerror(errno));
r = 1;
break;
}
fclose(s);
s = NULL;
}
if (s)
fclose(s);
fclose(f);
if (r != 0)
unlink(fn);
return r;
}
const char *package_get_item(struct package* p, const char *name) {
struct package_item *i;
char path[PATH_MAX];
assert(p && name);
for (i = p->items; i; i = i->next) {
if (strncmp(name, i->name, PACKAGE_ITEM_NAME_LEN) == 0)
return i->path;
}
snprintf(path, sizeof(path), "%s/%i", p->base, p->count++);
if (!(i = item_new(name, path))) {
unlink(path);
return NULL;
}
assert(!!p->last == !!p->items);
if (p->last) {
p->last->next = i;
p->last = i;
} else
p->items = p->last = i;
return i->path;
}
void package_remove(struct package *p) {
struct package_item *i, *n;
assert(p);
for (i = p->items; i; i = n) {
n = i->next;
if (i->path)
if (unlink(i->path))
if (errno != ENOENT)
fprintf(stderr, "Failed to remove <%s>: %s\n", i->path, strerror(errno));
free(i->path);
free(i->name);
free(i);
}
if (p->base) {
if (rmdir(p->base))
fprintf(stderr, "Failed to remove <%s>: %s\n", p->base, strerror(errno));
free(p->base);
}
free(p);
}
int package_foreach(struct package *p, int (*cb) (struct package *p, const char *name, const char *path, void *u), void *u) {
struct package_item *i;
assert(p);
for (i = p->items; i; i = i->next)
if (cb(p, i->name, i->path, u) < 0)
return -1;
return 0;
}
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