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To force-include some binary files as metadata. Also: * switch to C++-11 * add MD5Digest() [will be useful later for Extended-XMP] Change-Id: I517e5fd2ed1054947fdfd079b15878c1f1c986f1
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Skal
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Feb 5, 2020
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| // Copyright 2020 Google Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
| // Simple MD5 Digest code | ||
| // | ||
| // Author: Skal ([email protected]) | ||
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| #ifndef SJPEG_MD5SUM_H_ | ||
| #define SJPEG_MD5SUM_H_ | ||
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| #include <cstdint> | ||
| #include <cstdio> | ||
| #include <string> | ||
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| namespace sjpeg { | ||
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| class MD5Digest { | ||
| public: | ||
| explicit MD5Digest(const std::string& data = "") | ||
| : A(0x67452301), B(0xefcdab89), C(0x98badcfe), D(0x10325476) { | ||
| uint32_t s = data.size(); | ||
| assert(data.size() < (1ull << 32)); | ||
| uint32_t i, j; | ||
| for (i = 0; i + 64 <= s; i += 64) Add((const uint8_t*)&data[i]); | ||
| uint8_t block[64 + 64]; | ||
| for (j = 0; i < s; ++i) block[j++] = data[i]; | ||
| block[j++] = 0x80; // bit 1 | ||
| while ((j & 63) != 56) block[j++] = 0; // pad | ||
| for (i = 0, s *= 8; i < 8; ++i, s >>= 8) block[j++] = s & 0xff; | ||
| Add(block); | ||
| if (j > 64) Add(block + 64); | ||
| } | ||
| static uint32_t Rotate(uint32_t v, int n) { // n != 0 | ||
| return (v << n) | (v >> (32 - n)); | ||
| } | ||
| static uint32_t Get32(const uint8_t b[64], uint32_t i) { | ||
| b += 4 * (i & 15); | ||
| return ((uint32_t)b[0] << 0) | ((uint32_t)b[1] << 8) | | ||
| ((uint32_t)b[2] << 16) | ((uint32_t)b[3] << 24); | ||
| } | ||
| static void Put32(uint8_t* b, uint32_t v) { | ||
| char tmp[3]; | ||
| for (uint32_t i = 0; i < 4; ++i, v >>= 8) { | ||
| snprintf(tmp, sizeof(tmp), "%.2X", v & 0xff); | ||
| *b++ = tmp[0]; | ||
| *b++ = tmp[1]; | ||
| } | ||
| } | ||
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| void Add(const uint8_t block[64]) { | ||
| const uint8_t Kr[64] = { | ||
| 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, | ||
| 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, | ||
| 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, | ||
| 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21 | ||
| }; | ||
| const uint32_t KK[64] = { // (1ul << 32) * abs(std::sin(i + 1.)) | ||
| 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, | ||
| 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501, | ||
| 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, | ||
| 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, | ||
| 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, | ||
| 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8, | ||
| 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, | ||
| 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a, | ||
| 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, | ||
| 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, | ||
| 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05, | ||
| 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, | ||
| 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, | ||
| 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1, | ||
| 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, | ||
| 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391 | ||
| }; | ||
| uint32_t a = A, b = B, c = C, d = D; | ||
| for (uint32_t i = 0; i < 64; ++i) { | ||
| uint32_t e = a + KK[i]; | ||
| if (i < 16) { | ||
| e += d ^ (b & (c ^ d)); | ||
| e += Get32(block, i); | ||
| } else if (i < 32) { | ||
| e += c ^ (d & (b ^ c)); | ||
| e += Get32(block, 5 * i + 1); | ||
| } else if (i < 48) { | ||
| e += b ^ c ^ d; | ||
| e += Get32(block, 3 * i + 5); | ||
| } else { | ||
| e += c ^ (b | ~d); | ||
| e += Get32(block, 7 * i); | ||
| } | ||
| a = d; | ||
| d = c; | ||
| c = b; | ||
| b += Rotate(e, Kr[i]); | ||
| } | ||
| A += a; | ||
| B += b; | ||
| C += c; | ||
| D += d; | ||
| } | ||
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| std::string Get() const { // returns the hex digest (upper case) | ||
| uint8_t tmp[32]; | ||
| Get(tmp); | ||
| return std::string((const char*)tmp, 32u); | ||
| } | ||
| void Get(uint8_t out[32]) const { | ||
| Put32(out + 0, A); | ||
| Put32(out + 8, B); | ||
| Put32(out + 16, C); | ||
| Put32(out + 24, D); | ||
| } | ||
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| private: | ||
| uint32_t A, B, C, D; | ||
| }; | ||
|
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| } // namespace sjpeg | ||
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| #endif // SJPEG_MD5SUM_H_ |
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