mirror of
https://github.com/nestriness/cdc-file-transfer.git
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23fcd5ef1d
Improve cdc_fuse_fs and path Improves the error handling in path so that std:error_codes are not assumed to be of system category, and also that their messages are displayed. Also improves debug messages in GameletComponent.
100 lines
2.9 KiB
C++
100 lines
2.9 KiB
C++
// Copyright 2022 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "manifest/content_id.h"
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#include "blake3.h"
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namespace cdc_ft {
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namespace {
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// Converts |n| in the range 0..15 to its lower-case hex representation.
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// Returns -1 if |n| is not in the range 0..15.
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char IntToHex(uint8_t n) {
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if (n <= 9) return '0' + n;
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if (n <= 15) return 'a' + n - 10;
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return -1;
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}
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// Converts the lower-case hex character |c| to its integer representation.
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// Returns -1 if |c| is not a valid lower-case hex character.
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int HexToInt(char c) {
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if (c >= '0' && c <= '9') return c - '0';
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if (c >= 'a' && c <= 'f') return c - 'a' + 10;
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return -1;
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}
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} // namespace
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// static
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ContentIdProto ContentId::FromDataString(const std::string& data) {
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return FromArray(data.c_str(), data.size());
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}
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// static
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ContentIdProto ContentId::FromDataString(absl::string_view data) {
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return FromArray(data.data(), data.size());
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}
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// static
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ContentIdProto ContentId::FromArray(const void* data, size_t len) {
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blake3_hasher state;
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uint8_t out[kHashSize];
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blake3_hasher_init(&state);
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blake3_hasher_update(&state, data, len);
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blake3_hasher_finalize(&state, out, kHashSize);
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ContentIdProto content_id;
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content_id.set_blake3_sum_160(out, kHashSize);
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return content_id;
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}
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// static
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std::string ContentId::ToHexString(const ContentIdProto& content_id) {
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absl::string_view blake3_sum(content_id.blake3_sum_160());
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std::string ret;
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ret.reserve(blake3_sum.size() << 1);
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for (size_t i = 0; i < blake3_sum.size(); ++i) {
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ret.push_back(IntToHex(static_cast<uint8_t>(blake3_sum[i]) >> 4));
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ret.push_back(IntToHex(static_cast<uint8_t>(blake3_sum[i]) & 0xf));
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}
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return ret;
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}
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// static
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bool ContentId::FromHexString(const std::string& str,
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ContentIdProto* content_id) {
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if (str.size() != kHashSize * 2) return false;
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std::string* hash = content_id->mutable_blake3_sum_160();
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hash->clear();
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hash->reserve(kHashSize);
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for (size_t n = 0; n < str.size(); n += 2) {
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int high = HexToInt(str[n]);
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int low = HexToInt(str[n + 1]);
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if (high == -1 || low == -1) {
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hash->clear();
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return false;
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}
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hash->push_back((high << 4) + low);
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}
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return true;
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}
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// static
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uint8_t ContentId::GetByte(const ContentIdProto& content_id, size_t pos) {
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if (pos >= content_id.blake3_sum_160().size()) return 0;
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return content_id.blake3_sum_160()[pos];
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}
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} // namespace cdc_ft
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