Include C bindings of Snappy, contributed by Martin Gieseking.

I've made a few changes since Martin's version; mostly style nits, but also
a semantic change -- most functions that return bool in the C++ version now
return an enum, to better match typical C (and zlib) semantics.

I've kept the copyright notice, since Martin is obviously the author here;
he has signed the contributor license agreement, though, so this should not
hinder Google's use in the future.

We'll need to update the libtool version number to match the added interface,
but as of http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
I'm going to wait until public release.

R=csilvers
DELTA=238  (233 added, 0 deleted, 5 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=1294


git-svn-id: http://snappy.googlecode.com/svn/trunk@27 03e5f5b5-db94-4691-08a0-1a8bf15f6143

1 files changed, 90 insertions, 0 deletions

diff --git a/snappy-c.cc b/snappy-c.cc
new file mode 100644
index 0000000..473a0b0
--- /dev/null
+++ b/snappy-c.cc
@@ -0,0 +1,90 @@
+// Copyright 2011 Martin Gieseking <martin.gieseking@uos.de>.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "snappy.h"
+#include "snappy-c.h"
+
+extern "C" {
+
+snappy_status snappy_compress(const char* input,
+                              size_t input_length,
+                              char* compressed,
+                              size_t *compressed_length) {
+  if (*compressed_length < snappy_max_compressed_length(input_length)) {
+    return SNAPPY_BUFFER_TOO_SMALL;
+  }
+  snappy::RawCompress(input, input_length, compressed, compressed_length);
+  return SNAPPY_OK;
+}
+
+snappy_status snappy_uncompress(const char* compressed,
+                                size_t compressed_length,
+                                char* uncompressed,
+                                size_t* uncompressed_length) {
+  size_t real_uncompressed_length;
+  if (!snappy::GetUncompressedLength(compressed,
+                                     compressed_length,
+                                     &real_uncompressed_length)) {
+    return SNAPPY_INVALID_INPUT;
+  }
+  if (*uncompressed_length < real_uncompressed_length) {
+    return SNAPPY_BUFFER_TOO_SMALL;
+  }
+  if (!snappy::RawUncompress(compressed, compressed_length, uncompressed)) {
+    return SNAPPY_INVALID_INPUT;
+  }
+  *uncompressed_length = real_uncompressed_length;
+  return SNAPPY_OK;
+}
+
+size_t snappy_max_compressed_length(size_t source_length) {
+  return snappy::MaxCompressedLength(source_length);
+}
+
+snappy_status snappy_uncompressed_length(const char *compressed,
+                                         size_t compressed_length,
+                                         size_t *result) {
+  if (snappy::GetUncompressedLength(compressed,
+                                    compressed_length,
+                                    result)) {
+    return SNAPPY_OK;
+  } else {
+    return SNAPPY_INVALID_INPUT;
+  }
+}
+
+snappy_status snappy_validate_compressed_buffer(const char *compressed,
+                                                size_t compressed_length) {
+  if (snappy::IsValidCompressedBuffer(compressed, compressed_length)) {
+    return SNAPPY_OK;
+  } else {
+    return SNAPPY_INVALID_INPUT;
+  }
+}
+
+}  // extern "C"