如何zstd压缩输入文件中的字节块？

#include <zstd.h>
#include <iostream>
#include <fstream>

int main() {
    // 打开输入文件
    std::ifstream inputFile("input.txt", std::ios::binary);
    if (!inputFile) {
        std::cerr << "Failed to open input file." << std::endl;
        return 1;
    }

    // 创建输出文件
    std::ofstream outputFile("output.zst", std::ios::binary);
    if (!outputFile) {
        std::cerr << "Failed to create output file." << std::endl;
        return 1;
    }

    // 设置压缩参数
    ZSTD_CCtx* cctx = ZSTD_createCCtx();
    ZSTD_CDict* cdict = ZSTD_createCDict("compression_dictionary", 10);
    ZSTD_CCtx_setParameter(cctx, ZSTD_c_compressionLevel, 5);
    ZSTD_CCtx_setParameter(cctx, ZSTD_c_dictID, ZSTD_CDict_getDictID(cdict));

    // 分块压缩
    const size_t blockSize = 4096;
    char* inputBuffer = new char[blockSize];
    char* outputBuffer = new char[blockSize + ZSTD_compressBound(blockSize)];
    while (inputFile) {
        inputFile.read(inputBuffer, blockSize);
        const size_t bytesRead = inputFile.gcount();
        const size_t compressedSize = ZSTD_compressCCtx(cctx, outputBuffer, blockSize + ZSTD_compressBound(blockSize), inputBuffer, bytesRead, 1);
        outputFile.write(outputBuffer, compressedSize);
    }

    // 清理资源
    delete[] inputBuffer;
    delete[] outputBuffer;
    ZSTD_freeCCtx(cctx);
    ZSTD_freeCDict(cdict);

    // 关闭文件
    inputFile.close();
    outputFile.close();

    return 0;
}