1/*
2 * Copyright (C) 2010 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//#define LOG_NDEBUG 0
18#define LOG_TAG "hexdump"
19#include <utils/Log.h>
20
21#include "hexdump.h"
22
23#include "ADebug.h"
24#include "AString.h"
25
26#include <ctype.h>
27#include <stdint.h>
28#include <stdio.h>
29
30namespace android {
31
32static void appendIndent(AString *s, int32_t indent) {
33    static const char kWhitespace[] =
34        "                                        "
35        "                                        ";
36
37    CHECK_LT((size_t)indent, sizeof(kWhitespace));
38
39    s->append(kWhitespace, indent);
40}
41
42void hexdump(const void *_data, size_t size, size_t indent, AString *appendTo) {
43    const uint8_t *data = (const uint8_t *)_data;
44
45    size_t offset = 0;
46    while (offset < size) {
47        AString line;
48
49        appendIndent(&line, indent);
50
51        char tmp[32];
52        snprintf(tmp, sizeof(tmp), "%08lx:  ", (unsigned long)offset);
53
54        line.append(tmp);
55
56        for (size_t i = 0; i < 16; ++i) {
57            if (i == 8) {
58                line.append(' ');
59            }
60            if (offset + i >= size) {
61                line.append("   ");
62            } else {
63                snprintf(tmp, sizeof(tmp), "%02x ", data[offset + i]);
64                line.append(tmp);
65            }
66        }
67
68        line.append(' ');
69
70        for (size_t i = 0; i < 16; ++i) {
71            if (offset + i >= size) {
72                break;
73            }
74
75            if (isprint(data[offset + i])) {
76                line.append((char)data[offset + i]);
77            } else {
78                line.append('.');
79            }
80        }
81
82        if (appendTo != NULL) {
83            appendTo->append(line);
84            appendTo->append("\n");
85        } else {
86            ALOGI("%s", line.c_str());
87        }
88
89        offset += 16;
90    }
91}
92
93}  // namespace android
94
95