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// Copyright 2016 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "core/fxcrt/include/fx_basic.h"
#include "testing/fx_string_testhelpers.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace {
uint32_t ReferenceGetBits32(const uint8_t* pData, int bitpos, int nbits) {
int result = 0;
for (int i = 0; i < nbits; i++) {
if (pData[(bitpos + i) / 8] & (1 << (7 - (bitpos + i) % 8)))
result |= 1 << (nbits - i - 1);
}
return result;
}
} // namespace
TEST(fxge, GetBits32) {
unsigned char data[] = {0xDE, 0x3F, 0xB1, 0x7C, 0x12, 0x9A, 0x04, 0x56};
for (int nbits = 1; nbits <= 32; ++nbits) {
for (int bitpos = 0; bitpos < (int)sizeof(data) * 8 - nbits; ++bitpos) {
EXPECT_EQ(ReferenceGetBits32(data, bitpos, nbits),
GetBits32(data, bitpos, nbits));
}
}
}
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