1// Copyright 2011 Google Inc. All Rights Reserved.
2//
3// Redistribution and use in source and binary forms, with or without
4// modification, are permitted provided that the following conditions are
5// met:
6//
7// * Redistributions of source code must retain the above copyright
8// notice, this list of conditions and the following disclaimer.
9// * Redistributions in binary form must reproduce the above
10// copyright notice, this list of conditions and the following disclaimer
11// in the documentation and/or other materials provided with the
12// distribution.
13// * Neither the name of Google Inc. nor the names of its
14// contributors may be used to endorse or promote products derived from
15// this software without specific prior written permission.
16//
17// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29#include <stddef.h>
30#include <cstring>
31
32#include "snappy-sinksource.h"
33
34namespace snappy {
35
36Source::~Source() = default;
37
38Sink::~Sink() = default;
39
40char* Sink::GetAppendBuffer(size_t length, char* scratch) {
41 // TODO: Switch to [[maybe_unused]] when we can assume C++17.
42 (void)length;
43
44 return scratch;
45}
46
47char* Sink::GetAppendBufferVariable(
48 size_t min_size, size_t desired_size_hint, char* scratch,
49 size_t scratch_size, size_t* allocated_size) {
50 // TODO: Switch to [[maybe_unused]] when we can assume C++17.
51 (void)min_size;
52 (void)desired_size_hint;
53
54 *allocated_size = scratch_size;
55 return scratch;
56}
57
58void Sink::AppendAndTakeOwnership(
59 char* bytes, size_t n,
60 void (*deleter)(void*, const char*, size_t),
61 void *deleter_arg) {
62 Append(bytes, n);
63 (*deleter)(deleter_arg, bytes, n);
64}
65
66ByteArraySource::~ByteArraySource() = default;
67
68size_t ByteArraySource::Available() const { return left_; }
69
70const char* ByteArraySource::Peek(size_t* len) {
71 *len = left_;
72 return ptr_;
73}
74
75void ByteArraySource::Skip(size_t n) {
76 left_ -= n;
77 ptr_ += n;
78}
79
80UncheckedByteArraySink::~UncheckedByteArraySink() { }
81
82void UncheckedByteArraySink::Append(const char* data, size_t n) {
83 // Do no copying if the caller filled in the result of GetAppendBuffer()
84 if (data != dest_) {
85 std::memcpy(dest_, data, n);
86 }
87 dest_ += n;
88}
89
90char* UncheckedByteArraySink::GetAppendBuffer(size_t len, char* scratch) {
91 // TODO: Switch to [[maybe_unused]] when we can assume C++17.
92 (void)len;
93 (void)scratch;
94
95 return dest_;
96}
97
98void UncheckedByteArraySink::AppendAndTakeOwnership(
99 char* bytes, size_t n,
100 void (*deleter)(void*, const char*, size_t),
101 void *deleter_arg) {
102 if (bytes != dest_) {
103 std::memcpy(dest_, bytes, n);
104 (*deleter)(deleter_arg, bytes, n);
105 }
106 dest_ += n;
107}
108
109char* UncheckedByteArraySink::GetAppendBufferVariable(
110 size_t min_size, size_t desired_size_hint, char* scratch,
111 size_t scratch_size, size_t* allocated_size) {
112 // TODO: Switch to [[maybe_unused]] when we can assume C++17.
113 (void)min_size;
114 (void)scratch;
115 (void)scratch_size;
116
117 *allocated_size = desired_size_hint;
118 return dest_;
119}
120
121} // namespace snappy
122