San Mehat | a6391f1 | 2010-03-10 12:46:00 -0800 | [diff] [blame^] | 1 | /* libs/diskconfig/diskutils.c |
| 2 | * |
| 3 | * Copyright 2008, The Android Open Source Project |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | #define LOG_TAG "diskutils" |
| 19 | |
| 20 | #include <errno.h> |
| 21 | #include <fcntl.h> |
| 22 | #include <stdio.h> |
| 23 | #include <stdlib.h> |
| 24 | #include <string.h> |
| 25 | #include <unistd.h> |
| 26 | #include <sys/stat.h> |
| 27 | |
| 28 | #include <cutils/log.h> |
| 29 | |
| 30 | #include <diskconfig/diskconfig.h> |
| 31 | |
| 32 | int |
| 33 | write_raw_image(const char *dst, const char *src, loff_t offset, int test) |
| 34 | { |
| 35 | int dst_fd = -1; |
| 36 | int src_fd = -1; |
| 37 | uint8_t buffer[2048]; |
| 38 | int nr_bytes; |
| 39 | int tmp; |
| 40 | int done = 0; |
| 41 | uint64_t total = 0; |
| 42 | |
| 43 | LOGI("Writing RAW image '%s' to '%s' (offset=%llu)", src, dst, offset); |
| 44 | if ((src_fd = open(src, O_RDONLY)) < 0) { |
| 45 | LOGE("Could not open %s for reading (errno=%d).", src, errno); |
| 46 | goto fail; |
| 47 | } |
| 48 | |
| 49 | if (!test) { |
| 50 | if ((dst_fd = open(dst, O_RDWR)) < 0) { |
| 51 | LOGE("Could not open '%s' for read/write (errno=%d).", dst, errno); |
| 52 | goto fail; |
| 53 | } |
| 54 | |
| 55 | if (lseek64(dst_fd, offset, SEEK_SET) != offset) { |
| 56 | LOGE("Could not seek to offset %lld in %s.", offset, dst); |
| 57 | goto fail; |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | while (!done) { |
| 62 | if ((nr_bytes = read(src_fd, buffer, sizeof(buffer))) < 0) { |
| 63 | /* XXX: Should we not even bother with EINTR? */ |
| 64 | if (errno == EINTR) |
| 65 | continue; |
| 66 | LOGE("Error (%d) while reading from '%s'", errno, src); |
| 67 | goto fail; |
| 68 | } |
| 69 | |
| 70 | if (!nr_bytes) { |
| 71 | /* we're done. */ |
| 72 | done = 1; |
| 73 | break; |
| 74 | } |
| 75 | |
| 76 | total += nr_bytes; |
| 77 | |
| 78 | /* skip the write loop if we're testing */ |
| 79 | if (test) |
| 80 | nr_bytes = 0; |
| 81 | |
| 82 | while (nr_bytes > 0) { |
| 83 | if ((tmp = write(dst_fd, buffer, nr_bytes)) < 0) { |
| 84 | /* XXX: Should we not even bother with EINTR? */ |
| 85 | if (errno == EINTR) |
| 86 | continue; |
| 87 | LOGE("Error (%d) while writing to '%s'", errno, dst); |
| 88 | goto fail; |
| 89 | } |
| 90 | if (!tmp) |
| 91 | continue; |
| 92 | nr_bytes -= tmp; |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | if (!done) { |
| 97 | LOGE("Exited read/write loop without setting flag! WTF?!"); |
| 98 | goto fail; |
| 99 | } |
| 100 | |
| 101 | if (dst_fd >= 0) |
| 102 | fsync(dst_fd); |
| 103 | |
| 104 | LOGI("Wrote %llu bytes to %s @ %lld", total, dst, offset); |
| 105 | |
| 106 | close(src_fd); |
| 107 | if (dst_fd >= 0) |
| 108 | close(dst_fd); |
| 109 | return 0; |
| 110 | |
| 111 | fail: |
| 112 | if (dst_fd >= 0) |
| 113 | close(dst_fd); |
| 114 | if (src_fd >= 0) |
| 115 | close(src_fd); |
| 116 | return 1; |
| 117 | } |