Move endian utilities to their own file.
diff --git a/source/endian.cpp b/source/endian.cpp
new file mode 100644
index 0000000..240718a
--- /dev/null
+++ b/source/endian.cpp
@@ -0,0 +1,80 @@
+// Copyright (c) 2015 The Khronos Group Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and/or associated documentation files (the
+// "Materials"), to deal in the Materials without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Materials, and to
+// permit persons to whom the Materials are furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Materials.
+//
+// MODIFICATIONS TO THIS FILE MAY MEAN IT NO LONGER ACCURATELY REFLECTS
+// KHRONOS STANDARDS. THE UNMODIFIED, NORMATIVE VERSIONS OF KHRONOS
+// SPECIFICATIONS AND HEADER INFORMATION ARE LOCATED AT
+// https://www.khronos.org/registry/
+//
+// THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+// MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+
+#include "endian.h"
+
+#include <cstring>
+
+enum {
+ I32_ENDIAN_LITTLE = 0x03020100ul,
+ I32_ENDIAN_BIG = 0x00010203ul,
+};
+
+// TODO(dneto): This relies on undefined behaviour. Fix that.
+static const union {
+ unsigned char bytes[4];
+ uint32_t value;
+} o32_host_order = {{0, 1, 2, 3}};
+
+#define I32_ENDIAN_HOST (o32_host_order.value)
+
+uint32_t spvFixWord(const uint32_t word, const spv_endianness_t endian) {
+ if ((SPV_ENDIANNESS_LITTLE == endian && I32_ENDIAN_HOST == I32_ENDIAN_BIG) ||
+ (SPV_ENDIANNESS_BIG == endian && I32_ENDIAN_HOST == I32_ENDIAN_LITTLE)) {
+ return (word & 0x000000ff) << 24 | (word & 0x0000ff00) << 8 |
+ (word & 0x00ff0000) >> 8 | (word & 0xff000000) >> 24;
+ }
+
+ return word;
+}
+
+uint64_t spvFixDoubleWord(const uint32_t low, const uint32_t high,
+ const spv_endianness_t endian) {
+ return (uint64_t(spvFixWord(high, endian)) << 32) | spvFixWord(low, endian);
+}
+
+spv_result_t spvBinaryEndianness(const spv_binary binary,
+ spv_endianness_t *pEndian) {
+ if (!binary->code || !binary->wordCount) return SPV_ERROR_INVALID_BINARY;
+ if (!pEndian) return SPV_ERROR_INVALID_POINTER;
+
+ uint8_t bytes[4];
+ memcpy(bytes, binary->code, sizeof(uint32_t));
+
+ if (0x03 == bytes[0] && 0x02 == bytes[1] && 0x23 == bytes[2] &&
+ 0x07 == bytes[3]) {
+ *pEndian = SPV_ENDIANNESS_LITTLE;
+ return SPV_SUCCESS;
+ }
+
+ if (0x07 == bytes[0] && 0x23 == bytes[1] && 0x02 == bytes[2] &&
+ 0x03 == bytes[3]) {
+ *pEndian = SPV_ENDIANNESS_BIG;
+ return SPV_SUCCESS;
+ }
+
+ return SPV_ERROR_INVALID_BINARY;
+}