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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 "SkTypes.h"
#include "SkEndian.h"
#include "SkStream.h"
//The following macros can be defined to affect the MD5 code generated.
//SK_MD5_CLEAR_DATA causes all intermediate state to be overwritten with 0's.
//SK_CPU_LENDIAN allows 32 bit <=> 8 bit conversions without copies (if alligned).
//SK_CPU_FAST_UNALIGNED_ACCESS allows 32 bit <=> 8 bit conversions without copies if SK_CPU_LENDIAN.
class SkMD5 : public SkWStream {
public:
SkMD5();
/** Processes input, adding it to the digest.
* Note that this treats the buffer as a series of uint8_t values.
*/
bool write(const void* buffer, size_t size) override {
this->update(reinterpret_cast<const uint8_t*>(buffer), size);
return true;
}
size_t bytesWritten() const override { return SkToSizeT(this->byteCount); }
/** Processes input, adding it to the digest. Calling this after finish is undefined. */
void update(const uint8_t* input, size_t length);
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 0 != memcmp(data, other.data, sizeof(data));
}
};
/** Computes and returns the digest. */
void finish(Digest& digest);
private:
// number of bytes, modulo 2^64
uint64_t byteCount;
// state (ABCD)
uint32_t state[4];
// input buffer
uint8_t buffer[64];
};
#endif
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