1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <stdlib.h>
18#include <stdio.h>
19#include <errno.h>
20
21#include "adb.h"
22#include "fuse_sideload.h"
23
24struct adb_data {
25    int sfd;  // file descriptor for the adb channel
26
27    uint64_t file_size;
28    uint32_t block_size;
29};
30
31static int read_block_adb(void* cookie, uint32_t block, uint8_t* buffer, uint32_t fetch_size) {
32    struct adb_data* ad = (struct adb_data*)cookie;
33
34    char buf[10];
35    snprintf(buf, sizeof(buf), "%08u", block);
36    if (writex(ad->sfd, buf, 8) < 0) {
37        fprintf(stderr, "failed to write to adb host: %s\n", strerror(errno));
38        return -EIO;
39    }
40
41    if (readx(ad->sfd, buffer, fetch_size) < 0) {
42        fprintf(stderr, "failed to read from adb host: %s\n", strerror(errno));
43        return -EIO;
44    }
45
46    return 0;
47}
48
49static void close_adb(void* cookie) {
50    struct adb_data* ad = (struct adb_data*)cookie;
51
52    writex(ad->sfd, "DONEDONE", 8);
53}
54
55int run_adb_fuse(int sfd, uint64_t file_size, uint32_t block_size) {
56    struct adb_data ad;
57    struct provider_vtab vtab;
58
59    ad.sfd = sfd;
60    ad.file_size = file_size;
61    ad.block_size = block_size;
62
63    vtab.read_block = read_block_adb;
64    vtab.close = close_adb;
65
66    return run_fuse_sideload(&vtab, &ad, file_size, block_size);
67}
68