This is the O3D source tree's initial commit to the Chromium tree. It

is not built or referenced at all by the chrome build yet, and doesn't 
yet build in it's new home.  We'll change that shortly.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17035 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 401 insertions, 0 deletions

diff --git a/o3d/import/cross/memory_stream.cc b/o3d/import/cross/memory_stream.cc
new file mode 100644
index 0000000..9a4d6c5
--- /dev/null
+++ b/o3d/import/cross/memory_stream.cc
@@ -0,0 +1,401 @@
+/*
+ * Copyright 2009, Google Inc.
+ * All rights reserved.
+ *
+ * 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.
+ */
+
+//
+// MemoryReadStream and MemoryWriteStream are simple stream wrappers around
+// memory buffers.
+
+#include "import/cross/memory_stream.h"
+#include "core/cross/types.h"
+
+#if !defined(IS_LITTLE_ENDIAN) && !defined(IS_BIG_ENDIAN)
+#error "IS_LITTLE_ENDIAN or IS_BIG_ENDIAN must be defined!"
+#endif
+
+namespace o3d {
+
+namespace {
+union Int16Union {
+  uint8 c[2];
+  int16 i;
+};
+
+union UInt16Union {
+  uint8 c[2];
+  uint16 i;
+};
+
+union Int32Union {
+  uint8 c[4];
+  int32 i;
+};
+
+union UInt32Union {
+  uint8 c[4];
+  uint32 i;
+};
+
+union Int32FloatUnion {
+  int32 i;
+  float f;
+};
+
+union UInt32FloatUnion {
+  uint32 i;
+  float f;
+};
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+static int16 SwapInt16(const int16 *value) {
+  // endian-swap two bytes
+  uint8 p[2];
+  const char *q = reinterpret_cast<const char*>(value);
+  p[0] = q[1];
+  p[1] = q[0];
+
+  return *reinterpret_cast<int16*>(p);
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+static uint16 SwapUInt16(const uint16 *value) {
+  // endian-swap two bytes
+  uint8 p[2];
+  const char *q = reinterpret_cast<const char*>(value);
+  p[0] = q[1];
+  p[1] = q[0];
+
+  return *reinterpret_cast<const uint16*>(p);
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+static int32 SwapInt32(const int32 *value) {
+  // endian-swap four bytes
+  char p[4];
+  const char *q = reinterpret_cast<const char*>(value);
+  p[0] = q[3];
+  p[1] = q[2];
+  p[2] = q[1];
+  p[3] = q[0];
+
+  return *reinterpret_cast<const int32*>(p);
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+static uint32 SwapUInt32(const uint32 *value) {
+  // endian-swap four bytes
+  char p[4];
+  const char *q = reinterpret_cast<const char*>(value);
+  p[0] = q[3];
+  p[1] = q[2];
+  p[2] = q[1];
+  p[3] = q[0];
+
+  return *reinterpret_cast<const uint32*>(p);
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+int16 MemoryReadStream::ReadLittleEndianInt16() {
+  Int16Union u;
+  Read(u.c, 2);
+
+#ifdef IS_BIG_ENDIAN
+  return SwapInt16(&u.i);
+#else
+  return u.i;
+#endif
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+uint16 MemoryReadStream::ReadLittleEndianUInt16() {
+  UInt16Union u;
+  Read(u.c, 2);
+
+#ifdef IS_BIG_ENDIAN
+  return SwapUint16(&u.i);
+#else
+  return u.i;
+#endif
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+int16 MemoryReadStream::ReadBigEndianInt16() {
+  Int16Union u;
+  Read(u.c, 2);
+
+#ifdef IS_LITTLE_ENDIAN
+  return SwapInt16(&u.i);
+#else
+  return u.i;
+#endif
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+uint16 MemoryReadStream::ReadBigEndianUInt16() {
+  UInt16Union u;
+  Read(u.c, 2);
+
+#ifdef IS_LITTLE_ENDIAN
+  return SwapUInt16(&u.i);
+#else
+  return u.i;
+#endif
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+int32 MemoryReadStream::ReadLittleEndianInt32() {
+  Int32Union u;
+  Read(u.c, 4);
+
+#ifdef IS_BIG_ENDIAN
+  return SwapInt32(&u.i);
+#else
+  return u.i;
+#endif
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+uint32 MemoryReadStream::ReadLittleEndianUInt32() {
+  UInt32Union u;
+  Read(u.c, 4);
+
+#ifdef IS_BIG_ENDIAN
+  return SwapUInt32(&u.i);
+#else
+  return u.i;
+#endif
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+int32 MemoryReadStream::ReadBigEndianInt32() {
+  Int32Union u;
+  Read(u.c, 4);
+
+#ifdef IS_LITTLE_ENDIAN
+  return SwapInt32(&u.i);
+#else
+  return u.i;
+#endif
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+uint32 MemoryReadStream::ReadBigEndianUInt32() {
+  UInt32Union u;
+  Read(u.c, 4);
+
+#ifdef IS_LITTLE_ENDIAN
+  return SwapUInt32(&u.i);
+#else
+  return u.i;
+#endif
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+float MemoryReadStream::ReadLittleEndianFloat32() {
+  // Read in as int32 then interpret as float32
+  Int32FloatUnion u;
+  u.i = ReadLittleEndianInt32();
+  return u.f;
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+float MemoryReadStream::ReadBigEndianFloat32() {
+  // Read in as int32 then interpret as float32
+  Int32FloatUnion u;
+  u.i = ReadBigEndianInt32();
+  return u.f;
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+void MemoryWriteStream::WriteLittleEndianInt16(int16 i) {
+  Int16Union u;
+
+#ifdef IS_BIG_ENDIAN
+  u.i = SwapInt16(&i);
+#else
+  u.i = i;
+#endif
+
+  Write(u.c, 2);
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+void MemoryWriteStream::WriteLittleEndianUInt16(uint16 i) {
+  UInt16Union u;
+
+#ifdef IS_BIG_ENDIAN
+  u.i = SwapUInt16(&i);
+#else
+  u.i = i;
+#endif
+
+  Write(u.c, 2);
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+void MemoryWriteStream::WriteBigEndianInt16(int16 i) {
+  Int16Union u;
+
+#ifdef IS_LITTLE_ENDIAN
+  u.i = SwapInt16(&i);
+#else
+  u.i = i;
+#endif
+
+  Write(u.c, 2);
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+void MemoryWriteStream::WriteBigEndianUInt16(uint16 i) {
+  UInt16Union u;
+
+#ifdef IS_LITTLE_ENDIAN
+  u.i = SwapUInt16(&i);
+#else
+  u.i = i;
+#endif
+
+  Write(u.c, 2);
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+void MemoryWriteStream::WriteLittleEndianInt32(int32 i) {
+  Int32Union u;
+
+#ifdef IS_BIG_ENDIAN
+  u.i = SwapInt32(&i);
+#else
+  u.i = i;
+#endif
+
+  Write(u.c, 4);
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+void MemoryWriteStream::WriteLittleEndianUInt32(uint32 i) {
+  UInt32Union u;
+
+#ifdef IS_BIG_ENDIAN
+  u.i = SwapUInt32(&i);
+#else
+  u.i = i;
+#endif
+
+  Write(u.c, 4);
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+void MemoryWriteStream::WriteBigEndianInt32(int32 i) {
+  Int32Union u;
+
+#ifdef IS_LITTLE_ENDIAN
+  u.i = SwapInt32(&i);
+#else
+  u.i = i;
+#endif
+
+  Write(u.c, 4);
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+void MemoryWriteStream::WriteBigEndianUInt32(uint32 i) {
+  UInt32Union u;
+
+#ifdef IS_LITTLE_ENDIAN
+  u.i = SwapUInt32(&i);
+#else
+  u.i = i;
+#endif
+
+  Write(u.c, 4);
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+void MemoryWriteStream::WriteLittleEndianFloat32(float f) {
+  // Interpret byte-pattern of f as int32 and write out
+  Int32FloatUnion u;
+  u.f = f;
+  WriteLittleEndianInt32(u.i);
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+void MemoryWriteStream::WriteBigEndianFloat32(float f) {
+  // Interpret byte-pattern of f as int32 and write out
+  Int32FloatUnion u;
+  u.f = f;
+  WriteBigEndianInt32(u.i);
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// A couple of useful utility functions
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Returns the bytes pointed to by |value| as little-endian 16
+int16 MemoryReadStream::GetLittleEndianInt16(const int16 *value) {
+#ifdef IS_BIG_ENDIAN
+  return SwapInt16(value);
+#else
+  return *value;
+#endif
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Returns the bytes pointed to by |value| as little-endian 16
+uint16 MemoryReadStream::GetLittleEndianUInt16(const uint16 *value) {
+#ifdef IS_BIG_ENDIAN
+  return SwapUInt16(value);
+#else
+  return *value;
+#endif
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Returns the bytes pointed to by |value| as little-endian 32
+int32 MemoryReadStream::GetLittleEndianInt32(const int32 *value) {
+#ifdef IS_BIG_ENDIAN
+  return SwapInt32(value);
+#else
+  return *value;
+#endif
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Returns the bytes pointed to by |value| as little-endian 32
+uint32 MemoryReadStream::GetLittleEndianUInt32(const uint32 *value) {
+#ifdef IS_BIG_ENDIAN
+  return SwapUint32(value);
+#else
+  return *value;
+#endif
+}
+
+}  // namespace o3d