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/*
* Copyright 2017 WebAssembly Community Group participants
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "wabt/lexer-source.h"
#include <algorithm>
namespace wabt {
LexerSource::LexerSource(const void* data, Offset size)
: data_(data), size_(size), read_offset_(0) {}
std::unique_ptr<LexerSource> LexerSource::Clone() {
LexerSource* result = new LexerSource(data_, size_);
result->read_offset_ = read_offset_;
return std::unique_ptr<LexerSource>(result);
}
Result LexerSource::Tell(Offset* out_offset) {
*out_offset = read_offset_;
return Result::Ok;
}
size_t LexerSource::Fill(void* dest, Offset size) {
Offset read_size = std::min(size, size_ - read_offset_);
if (read_size > 0) {
const void* src = static_cast<const char*>(data_) + read_offset_;
memcpy(dest, src, read_size);
read_offset_ += read_size;
}
return read_size;
}
Result LexerSource::Seek(Offset offset) {
if (offset < size_) {
read_offset_ = offset;
return Result::Ok;
}
return Result::Error;
}
Result LexerSource::ReadRange(OffsetRange range, std::vector<char>* out_data) {
OffsetRange clamped = range;
clamped.start = std::min(clamped.start, size_);
clamped.end = std::min(clamped.end, size_);
if (clamped.size()) {
out_data->resize(clamped.size());
const void* src = static_cast<const char*>(data_) + clamped.start;
memcpy(out_data->data(), src, clamped.size());
}
return Result::Ok;
}
} // namespace wabt