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// Copyright 2015 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 "base/logging.h"
#include "net/der/input.h"
namespace net {
namespace der {
Input::Input() : data_(nullptr), len_(0) {
}
Input::Input(const uint8_t* data, size_t len) : data_(data), len_(len) {
}
Input::Input(const std::string& s)
: data_(reinterpret_cast<const uint8_t*>(s.data())), len_(s.size()) {
}
ByteReader::ByteReader(const Input& in)
: data_(in.UnsafeData()), len_(in.Length()) {
}
bool ByteReader::ReadByte(uint8_t* byte_p) {
if (!HasMore())
return false;
*byte_p = *data_;
Advance(1);
return true;
}
bool ByteReader::ReadBytes(size_t len, Input* out) {
if (len > len_)
return false;
*out = Input(data_, len);
Advance(len);
return true;
}
// Returns whether there is any more data to be read.
bool ByteReader::HasMore() {
return len_ > 0;
}
Mark ByteReader::NewMark() {
return Mark(data_);
}
bool ByteReader::AdvanceToMark(Mark mark) {
if (mark.ptr_ < data_)
return false;
// mark.ptr_ >= data_, so no concern of integer underflow here.
size_t advance_len = mark.ptr_ - data_;
if (advance_len > len_)
return false;
Advance(advance_len);
return true;
}
bool ByteReader::ReadToMark(Mark mark, Input* out) {
if (mark.ptr_ < data_)
return false;
// mark.ptr_ >= data_, so no concern of integer underflow here.
size_t len = mark.ptr_ - data_;
return ReadBytes(len, out);
}
void ByteReader::Advance(size_t len) {
CHECK_LE(len, len_);
data_ += len;
len_ -= len;
}
Mark Mark::NullMark() {
return Mark();
}
bool Mark::IsEmpty() {
return ptr_ == nullptr;
}
Mark::Mark(const uint8_t* ptr) : ptr_(ptr) {
}
Mark::Mark() : ptr_(nullptr) {
}
} // namespace der
} // namespace net
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