| // 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)); |
| } |
| } |
| } |