1 | /* |
2 | * Copyright 2010-2018 Amazon.com, Inc. or its affiliates. All Rights Reserved. |
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 | * A copy of the License is located at |
7 | * |
8 | * http://aws.amazon.com/apache2.0 |
9 | * |
10 | * or in the "license" file accompanying this file. This file is distributed |
11 | * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either |
12 | * express or implied. See the License for the specific language governing |
13 | * permissions and limitations under the License. |
14 | */ |
15 | #include <aws/common/uuid.h> |
16 | |
17 | #include <aws/common/byte_buf.h> |
18 | #include <aws/common/device_random.h> |
19 | |
20 | #include <inttypes.h> |
21 | #include <stdio.h> |
22 | |
23 | #define HEX_CHAR_FMT "%02" SCNx8 |
24 | |
25 | #define UUID_FORMAT \ |
26 | HEX_CHAR_FMT HEX_CHAR_FMT HEX_CHAR_FMT HEX_CHAR_FMT \ |
27 | "-" HEX_CHAR_FMT HEX_CHAR_FMT "-" HEX_CHAR_FMT HEX_CHAR_FMT "-" HEX_CHAR_FMT HEX_CHAR_FMT \ |
28 | "-" HEX_CHAR_FMT HEX_CHAR_FMT HEX_CHAR_FMT HEX_CHAR_FMT HEX_CHAR_FMT HEX_CHAR_FMT |
29 | |
30 | #include <stdio.h> |
31 | |
32 | #ifdef _MSC_VER |
33 | /* disables warning non const declared initializers for Microsoft compilers */ |
34 | # pragma warning(disable : 4204) |
35 | # pragma warning(disable : 4706) |
36 | /* sprintf warning (we already check the bounds in this case). */ |
37 | # pragma warning(disable : 4996) |
38 | #endif |
39 | |
40 | int aws_uuid_init(struct aws_uuid *uuid) { |
41 | struct aws_byte_buf buf = aws_byte_buf_from_empty_array(uuid->uuid_data, sizeof(uuid->uuid_data)); |
42 | |
43 | return aws_device_random_buffer(&buf); |
44 | } |
45 | |
46 | int aws_uuid_init_from_str(struct aws_uuid *uuid, const struct aws_byte_cursor *uuid_str) { |
47 | AWS_ERROR_PRECONDITION(uuid_str->len >= AWS_UUID_STR_LEN - 1, AWS_ERROR_INVALID_BUFFER_SIZE); |
48 | |
49 | char cpy[AWS_UUID_STR_LEN] = {0}; |
50 | memcpy(cpy, uuid_str->ptr, AWS_UUID_STR_LEN - 1); |
51 | |
52 | AWS_ZERO_STRUCT(*uuid); |
53 | |
54 | if (16 != sscanf( |
55 | cpy, |
56 | UUID_FORMAT, |
57 | &uuid->uuid_data[0], |
58 | &uuid->uuid_data[1], |
59 | &uuid->uuid_data[2], |
60 | &uuid->uuid_data[3], |
61 | &uuid->uuid_data[4], |
62 | &uuid->uuid_data[5], |
63 | &uuid->uuid_data[6], |
64 | &uuid->uuid_data[7], |
65 | &uuid->uuid_data[8], |
66 | &uuid->uuid_data[9], |
67 | &uuid->uuid_data[10], |
68 | &uuid->uuid_data[11], |
69 | &uuid->uuid_data[12], |
70 | &uuid->uuid_data[13], |
71 | &uuid->uuid_data[14], |
72 | &uuid->uuid_data[15])) { |
73 | return aws_raise_error(AWS_ERROR_MALFORMED_INPUT_STRING); |
74 | } |
75 | |
76 | return AWS_OP_SUCCESS; |
77 | } |
78 | |
79 | int aws_uuid_to_str(const struct aws_uuid *uuid, struct aws_byte_buf *output) { |
80 | AWS_ERROR_PRECONDITION(output->capacity - output->len >= AWS_UUID_STR_LEN, AWS_ERROR_SHORT_BUFFER); |
81 | |
82 | sprintf( |
83 | (char *)(output->buffer + output->len), |
84 | UUID_FORMAT, |
85 | uuid->uuid_data[0], |
86 | uuid->uuid_data[1], |
87 | uuid->uuid_data[2], |
88 | uuid->uuid_data[3], |
89 | uuid->uuid_data[4], |
90 | uuid->uuid_data[5], |
91 | uuid->uuid_data[6], |
92 | uuid->uuid_data[7], |
93 | uuid->uuid_data[8], |
94 | uuid->uuid_data[9], |
95 | uuid->uuid_data[10], |
96 | uuid->uuid_data[11], |
97 | uuid->uuid_data[12], |
98 | uuid->uuid_data[13], |
99 | uuid->uuid_data[14], |
100 | uuid->uuid_data[15]); |
101 | |
102 | output->len += AWS_UUID_STR_LEN - 1; |
103 | |
104 | return AWS_OP_SUCCESS; |
105 | } |
106 | |
107 | bool aws_uuid_equals(const struct aws_uuid *a, const struct aws_uuid *b) { |
108 | return 0 == memcmp(a->uuid_data, b->uuid_data, sizeof(a->uuid_data)); |
109 | } |
110 | |