Developer Documentation

snappy-sinksource.cc
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
33 namespace snappy {
34
35 Source::~Source() { }
36
37 Sink::~Sink() { }
38
39 char* Sink::GetAppendBuffer(size_t length, char* scratch) {
40 return scratch;
41 }
42
43 char* 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
50 void 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
58 ByteArraySource::~ByteArraySource() { }
59
60 size_t ByteArraySource::Available() const { return left_; }
61
62 const char* ByteArraySource::Peek(size_t* len) {
63 *len = left_;
64 return ptr_;
65 }
66
67 void ByteArraySource::Skip(size_t n) {
68 left_ -= n;
69 ptr_ += n;
70 }
71
72 UncheckedByteArraySink::~UncheckedByteArraySink() { }
73
74 void 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
82 char* UncheckedByteArraySink::GetAppendBuffer(size_t len, char* scratch) {
83 return dest_;
84 }
85
86 void 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
97 char* 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
snappy
Definition: snappy-internal.h:36