Issue #1737 - Import libaom 2.0.2 source

1 files changed, 41 insertions, 0 deletions

diff --git a/media/libaom/src/aom_dsp/bitreader.c b/media/libaom/src/aom_dsp/bitreader.c
new file mode 100644
index 0000000000..4c70a91712
--- /dev/null
+++ b/media/libaom/src/aom_dsp/bitreader.c
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#include "aom_dsp/bitreader.h"
+
+int aom_reader_init(aom_reader *r, const uint8_t *buffer, size_t size) {
+  if (size && !buffer) {
+    return 1;
+  }
+  r->buffer_end = buffer + size;
+  r->buffer = buffer;
+  od_ec_dec_init(&r->ec, buffer, (uint32_t)size);
+#if CONFIG_ACCOUNTING
+  r->accounting = NULL;
+#endif
+  return 0;
+}
+
+const uint8_t *aom_reader_find_begin(aom_reader *r) { return r->buffer; }
+
+const uint8_t *aom_reader_find_end(aom_reader *r) { return r->buffer_end; }
+
+uint32_t aom_reader_tell(const aom_reader *r) { return od_ec_dec_tell(&r->ec); }
+
+uint32_t aom_reader_tell_frac(const aom_reader *r) {
+  return od_ec_dec_tell_frac(&r->ec);
+}
+
+int aom_reader_has_overflowed(const aom_reader *r) {
+  const uint32_t tell_bits = aom_reader_tell(r);
+  const uint32_t tell_bytes = (tell_bits + 7) >> 3;
+  return ((ptrdiff_t)tell_bytes > r->buffer_end - r->buffer);
+}