snappy-c.cc (3637B)
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"