/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkMD5_DEFINED
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#define SkMD5_DEFINED
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#include "SkStream.h"
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#include "SkTo.h"
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/* Calculate a 128-bit MD5 message-digest of the bytes sent to this stream. */
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class SkMD5 : public SkWStream {
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public:
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SkMD5();
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/** Processes input, adding it to the digest.
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Calling this after finish is undefined. */
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bool write(const void* buffer, size_t size) final;
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size_t bytesWritten() const final { return SkToSizeT(this->byteCount); }
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struct Digest {
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uint8_t data[16];
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bool operator ==(Digest const& other) const {
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return 0 == memcmp(data, other.data, sizeof(data));
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}
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bool operator !=(Digest const& other) const { return !(*this == other); }
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};
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/** Computes and returns the digest. */
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void finish(Digest& digest);
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private:
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uint64_t byteCount; // number of bytes, modulo 2^64
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uint32_t state[4]; // state (ABCD)
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uint8_t buffer[64]; // input buffer
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};
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#endif
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