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 <string.h>
30
31#include "snappy-sinksource.h"
32
33namespace snappy {
34
35Source::~Source() { }
36
37Sink::~Sink() { }
38
39char* Sink::GetAppendBuffer(size_t length, char* scratch) {
40 return scratch;
41}
42
43char* Sink::GetAppendBufferVariable(
44 size_t min_size, size_t desired_size_hint, char* scratch,
45 size_t scratch_size, size_t* allocated_size) {
46 *allocated_size = scratch_size;
47 return scratch;
48}
49
50void Sink::AppendAndTakeOwnership(
51 char* bytes, size_t n,
52 void (*deleter)(void*, const char*, size_t),
53 void *deleter_arg) {
54 Append(bytes, n);
55 (*deleter)(deleter_arg, bytes, n);
56}
57
58ByteArraySource::~ByteArraySource() { }
59
60size_t ByteArraySource::Available() const { return left_; }
61
62const char* ByteArraySource::Peek(size_t* len) {
63 *len = left_;
64 return ptr_;
65}
66
67void ByteArraySource::Skip(size_t n) {
68 left_ -= n;
69 ptr_ += n;
70}
71
72UncheckedByteArraySink::~UncheckedByteArraySink() { }
73
74void UncheckedByteArraySink::Append(const char* data, size_t n) {
75 // Do no copying if the caller filled in the result of GetAppendBuffer()
76 if (data != dest_) {
77 memcpy(dest_, data, n);
78 }
79 dest_ += n;
80}
81
82char* UncheckedByteArraySink::GetAppendBuffer(size_t len, char* scratch) {
83 return dest_;
84}
85
86void UncheckedByteArraySink::AppendAndTakeOwnership(
87 char* data, size_t n,
88 void (*deleter)(void*, const char*, size_t),
89 void *deleter_arg) {
90 if (data != dest_) {
91 memcpy(dest_, data, n);
92 (*deleter)(deleter_arg, data, n);
93 }
94 dest_ += n;
95}
96
97char* UncheckedByteArraySink::GetAppendBufferVariable(
98 size_t min_size, size_t desired_size_hint, char* scratch,
99 size_t scratch_size, size_t* allocated_size) {
100 *allocated_size = desired_size_hint;
101 return dest_;
102}
103
104} // namespace snappy
105