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// Copyright 2019 The Chromium 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 "sql/recover_module/integers.h"
#include "base/logging.h"
namespace sql {
namespace recover {
std::pair<int64_t, const uint8_t*> ParseVarint(const uint8_t* buffer,
const uint8_t* buffer_end) {
DCHECK(buffer != nullptr);
DCHECK(buffer_end != nullptr);
DCHECK_LT(buffer, buffer_end);
const uint8_t* const regular_buffer_end =
(buffer_end - buffer > kMaxVarintSize - 1) ? buffer + kMaxVarintSize - 1
: buffer_end;
uint64_t value = 0;
uint8_t last_byte;
while (buffer < regular_buffer_end) {
last_byte = *buffer;
++buffer;
value = (value << 7) | (last_byte & 0x7f);
if ((last_byte & 0x80) == 0)
break;
}
if (buffer < buffer_end && (last_byte & 0x80) != 0) {
value = (value << 8) | *buffer;
++buffer;
}
return {value, buffer};
}
} // namespace recover
} // namespace sql
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