1 files changed, 48 insertions, 0 deletions
diff --git a/modules/brotli/dec/bit_reader.c b/modules/brotli/dec/bit_reader.c
new file mode 100644
index 000000000..cde90af56
--- /dev/null
+++ b/modules/brotli/dec/bit_reader.c
@@ -0,0 +1,48 @@
+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* Bit reading helpers */
+
+#include "./bit_reader.h"
+
+#include "./port.h"
+#include "./types.h"
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+void BrotliInitBitReader(BrotliBitReader* const br) {
+  br->val_ = 0;
+  br->bit_pos_ = sizeof(br->val_) << 3;
+}
+
+int BrotliWarmupBitReader(BrotliBitReader* const br) {
+  size_t aligned_read_mask = (sizeof(br->val_) >> 1) - 1;
+  /* Fixing alignment after unaligned BrotliFillWindow would result accumulator
+     overflow. If unalignment is caused by BrotliSafeReadBits, then there is
+     enough space in accumulator to fix aligment. */
+  if (!BROTLI_ALIGNED_READ) {
+    aligned_read_mask = 0;
+  }
+  if (BrotliGetAvailableBits(br) == 0) {
+    if (!BrotliPullByte(br)) {
+      return 0;
+    }
+  }
+
+  while ((((size_t)br->next_in) & aligned_read_mask) != 0) {
+    if (!BrotliPullByte(br)) {
+      /* If we consumed all the input, we don't care about the alignment. */
+      return 1;
+    }
+  }
+  return 1;
+}
+
+#if defined(__cplusplus) || defined(c_plusplus)
+}  /* extern "C" */
+#endif