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   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"