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