unsigned char *
file_data_read_compressed(struct file *file, long long offset, int size, int size_uncomp)
{
void *ret;
char *buffer = 0;
uLongf destLen=size_uncomp;
if (file->cache) {
struct file_cache_id id={offset,size,file->name_id,1};
ret=cache_lookup(file_cache,&id);
if (ret)
return ret;
ret=cache_insert_new(file_cache,&id,size_uncomp);
} else
ret=g_malloc(size_uncomp);
lseek(file->fd, offset, SEEK_SET);
buffer = (char *)g_malloc(size);
if (read(file->fd, buffer, size) != size) {
g_free(ret);
ret=NULL;
} else {
if (uncompress_int(ret, &destLen, (Bytef *)buffer, size) != Z_OK) {
dbg(0,"uncompress failed\n");
g_free(ret);
ret=NULL;
}
}
g_free(buffer);
return ret;
}
unsigned char *
file_data_read_compressed(struct file *file, long long offset, int size, int size_uncomp)
{
void *ret;
char buffer[size];
uLongf destLen=size_uncomp;
ret=g_malloc(size_uncomp);
lseek(file->fd, offset, SEEK_SET);
if (read(file->fd, buffer, size) != size) {
g_free(ret);
ret=NULL;
} else {
if (uncompress_int(ret, &destLen, (Bytef *)buffer, size) != Z_OK) {
dbg(0,"uncompress failed\n");
g_free(ret);
ret=NULL;
}
}
return ret;
}
unsigned char *
file_data_read_encrypted(struct file *file, long long offset, int size, int size_uncomp, int compressed, char *passwd)
{
#ifdef HAVE_LIBCRYPTO
void *ret;
unsigned char *buffer = 0;
uLongf destLen=size_uncomp;
if (file->cache) {
struct file_cache_id id={offset,size,file->name_id,1};
ret=cache_lookup(file_cache,&id);
if (ret)
return ret;
ret=cache_insert_new(file_cache,&id,size_uncomp);
} else
ret=g_malloc(size_uncomp);
lseek(file->fd, offset, SEEK_SET);
buffer = (unsigned char *)g_malloc(size);
if (read(file->fd, buffer, size) != size) {
g_free(ret);
ret=NULL;
} else {
unsigned char key[34], salt[8], verify[2], counter[16], xor[16], mac[10], *datap;
int overhead=sizeof(salt)+sizeof(verify)+sizeof(mac);
int esize=size-overhead;
PKCS5_PBKDF2_HMAC_SHA1(passwd, strlen(passwd), (unsigned char *)buffer, 8, 1000, 34, key);
if (key[32] == buffer[8] && key[33] == buffer[9] && esize >= 0) {
AES_KEY aeskey;
AES_set_encrypt_key(key, 128, &aeskey);
datap=buffer+sizeof(salt)+sizeof(verify);
memset(counter, 0, sizeof(counter));
while (esize > 0) {
int i,curr_size,idx=0;
do {
counter[idx]++;
} while (!counter[idx++]);
AES_encrypt(counter, xor, &aeskey);
curr_size=esize;
if (curr_size > sizeof(xor))
curr_size=sizeof(xor);
for (i = 0 ; i < curr_size ; i++)
*datap++^=xor[i];
esize-=curr_size;
}
size-=overhead;
datap=buffer+sizeof(salt)+sizeof(verify);
if (compressed) {
if (uncompress_int(ret, &destLen, (Bytef *)datap, size) != Z_OK) {
dbg(0,"uncompress failed\n");
g_free(ret);
ret=NULL;
}
} else {
if (size == destLen)
memcpy(ret, buffer, destLen);
else {
dbg(0,"memcpy failed\n");
g_free(ret);
ret=NULL;
}
}
} else {
g_free(ret);
ret=NULL;
}
}
g_free(buffer);
return ret;
#else
return NULL;
#endif
}
