emdedded_resource_reader.cc

/*
 * Copyright (c) 2023 by Mark Tarrabain All rights reserved. Redistribution and use in source and binary forms,
 * with or without modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this list of conditions and the following
 * disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
 * disclaimer in the documentation and/or other materials provided with the distribution.
 * Neither the name of the nor the names of its contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include "emdedded_resource_reader.h"
#include "encoding_utils.h"

#include <filesystem>
#include <fstream>
#include <sstream>
#include <stdexcept>

#ifdef _WIN32
#include <windows.h>
#else
#include <limits.h>
#include <unistd.h>
#endif

namespace {

std::filesystem::path get_exe_parent_path_intern() {
    std::filesystem::path path;
#ifdef _WIN32
    wchar_t result[MAX_PATH] = {0};
    GetModuleFileNameW(nullptr, result, MAX_PATH);
    path = std::filesystem::path(result);
#else
    char result[PATH_MAX];
    ssize_t count = readlink("/proc/self/exe", result, PATH_MAX);
    path = std::filesystem::path(std::string(result, count > 0 ? count : 0));
#endif
    return path.parent_path();
}

}
const std::filesystem::path exe_parent_path = get_exe_parent_path_intern();

EmbeddedResourceReader::EmbeddedResourceReader(const std::string& resourceName) 
    : resourceName_(resourceName)
{
}

std::vector<std::string> EmbeddedResourceReader::readLines() {
    std::filesystem::path resource_path = exe_parent_path / "tokenizers" / resourceName_;
    std::ifstream file(resource_path);
    if (!file.is_open()) {
        throw std::runtime_error("Embedded resource '" + resource_path.string() + "' not found.");
    }

    std::string line;
    std::vector<std::string> lines;
    while (std::getline(file, line)) {
        lines.push_back(line);
    }

    return lines;
}

EmbeddedResourceLoader::EmbeddedResourceLoader(const std::string& dataSourceName, IResourceReader* reader)
    : resourceReader_(reader)
    , dataSourceName_(dataSourceName)
{
}

std::vector<std::string> EmbeddedResourceLoader::readEmbeddedResourceAsLines() {
    if (!!resourceReader_) {
        return resourceReader_->readLines();
    }
    return EmbeddedResourceReader(dataSourceName_).readLines();
}

std::unordered_map<std::vector<uint8_t>, int, VectorHash>
EmbeddedResourceLoader::loadTokenBytePairEncoding()
{
    auto lines = readEmbeddedResourceAsLines();
    std::unordered_map<std::vector<uint8_t>, int, VectorHash> token_byte_pair_encoding;

    for (const auto &line: lines) {
        if (!line.empty()) {
            std::istringstream iss(line);
            std::string base64_string;
            int rank;

            iss >> base64_string >> rank;
            auto decoded = base64::decode(base64_string);
            std::vector<uint8_t> decoded_bytes(decoded.begin(), decoded.end());

            token_byte_pair_encoding[decoded_bytes] = rank;
        }
    }

    return token_byte_pair_encoding;
}