Developer Documentation

snappy-c.cc
1 // Copyright 2011 Martin Gieseking <martin.gieseking@uos.de>.
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 "snappy.h"
30 #include "snappy-c.h"
31
32 extern "C" {
33
34 snappy_status snappy_compress(const char* input,
35 size_t input_length,
36 char* compressed,
37 size_t *compressed_length) {
38 if (*compressed_length < snappy_max_compressed_length(input_length)) {
39 return SNAPPY_BUFFER_TOO_SMALL;
40 }
41 snappy::RawCompress(input, input_length, compressed, compressed_length);
42 return SNAPPY_OK;
43 }
44
45 snappy_status snappy_uncompress(const char* compressed,
46 size_t compressed_length,
47 char* uncompressed,
48 size_t* uncompressed_length) {
49 size_t real_uncompressed_length;
50 if (!snappy::GetUncompressedLength(compressed,
51 compressed_length,
52 &real_uncompressed_length)) {
53 return SNAPPY_INVALID_INPUT;
54 }
55 if (*uncompressed_length < real_uncompressed_length) {
56 return SNAPPY_BUFFER_TOO_SMALL;
57 }
58 if (!snappy::RawUncompress(compressed, compressed_length, uncompressed)) {
59 return SNAPPY_INVALID_INPUT;
60 }
61 *uncompressed_length = real_uncompressed_length;
62 return SNAPPY_OK;
63 }
64
65 size_t snappy_max_compressed_length(size_t source_length) {
66 return snappy::MaxCompressedLength(source_length);
67 }
68
69 snappy_status snappy_uncompressed_length(const char *compressed,
70 size_t compressed_length,
71 size_t *result) {
72 if (snappy::GetUncompressedLength(compressed,
73 compressed_length,
74 result)) {
75 return SNAPPY_OK;
76 } else {
77 return SNAPPY_INVALID_INPUT;
78 }
79 }
80
81 snappy_status snappy_validate_compressed_buffer(const char *compressed,
82 size_t compressed_length) {
83 if (snappy::IsValidCompressedBuffer(compressed, compressed_length)) {
84 return SNAPPY_OK;
85 } else {
86 return SNAPPY_INVALID_INPUT;
87 }
88 }
89
90 } // extern "C"