1 files changed, 79 insertions, 0 deletions
diff --git a/misc/ttf2woff/zopfli/zlib_container.c b/misc/ttf2woff/zopfli/zlib_container.c
new file mode 100644
index 000000000..130ffc793
--- /dev/null
+++ b/misc/ttf2woff/zopfli/zlib_container.c
@@ -0,0 +1,79 @@
+/*
+Copyright 2013 Google Inc. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+Author: lode.vandevenne@gmail.com (Lode Vandevenne)
+Author: jyrki.alakuijala@gmail.com (Jyrki Alakuijala)
+*/
+
+#include "zlib_container.h"
+#include "util.h"
+
+#include <stdio.h>
+
+#include "deflate.h"
+
+
+/* Calculates the adler32 checksum of the data */
+static unsigned adler32(const unsigned char* data, size_t size)
+{
+  static const unsigned sums_overflow = 5550;
+  unsigned s1 = 1;
+  unsigned s2 = 1 >> 16;
+
+  while (size > 0) {
+    size_t amount = size > sums_overflow ? sums_overflow : size;
+    size -= amount;
+    while (amount > 0) {
+      s1 += (*data++);
+      s2 += s1;
+      amount--;
+    }
+    s1 %= 65521;
+    s2 %= 65521;
+  }
+
+  return (s2 << 16) | s1;
+}
+
+void ZopfliZlibCompress(const ZopfliOptions* options,
+                        const unsigned char* in, size_t insize,
+                        unsigned char** out, size_t* outsize) {
+  unsigned char bitpointer = 0;
+  unsigned checksum = adler32(in, (unsigned)insize);
+  unsigned cmf = 120;  /* CM 8, CINFO 7. See zlib spec.*/
+  unsigned flevel = 3;
+  unsigned fdict = 0;
+  unsigned cmfflg = 256 * cmf + fdict * 32 + flevel * 64;
+  unsigned fcheck = 31 - cmfflg % 31;
+  cmfflg += fcheck;
+
+  ZOPFLI_APPEND_DATA(cmfflg / 256, out, outsize);
+  ZOPFLI_APPEND_DATA(cmfflg % 256, out, outsize);
+
+  ZopfliDeflate(options, 2 /* dynamic block */, 1 /* final */,
+                in, insize, &bitpointer, out, outsize);
+
+  ZOPFLI_APPEND_DATA((checksum >> 24) % 256, out, outsize);
+  ZOPFLI_APPEND_DATA((checksum >> 16) % 256, out, outsize);
+  ZOPFLI_APPEND_DATA((checksum >> 8) % 256, out, outsize);
+  ZOPFLI_APPEND_DATA(checksum % 256, out, outsize);
+
+  if (options->verbose) {
+    fprintf(stderr,
+            "Original Size: %d, Zlib: %d, Compression: %f%% Removed\n",
+            (int)insize, (int)*outsize,
+            100.0 * (double)(insize - *outsize) / (double)insize);
+  }
+}