求纯C语言图像压缩程序，允许有损压缩，速度越快越好

#include <stdio.h>
#include <jpeglib.h>

// 压缩函数
void compress_image(const char* input_file, const char* output_file, int quality) {
    struct jpeg_compress_struct cinfo;
    struct jpeg_error_mgr jerr;

    // 打开并设置输入文件
    FILE* infile = fopen(input_file, "rb");
    if (infile == NULL) {
        fprintf(stderr, "Can't open %s\n", input_file);
        return;
    }

    // 打开并设置输出文件
    FILE* outfile = fopen(output_file, "wb");
    if (outfile == NULL) {
        fprintf(stderr, "Can't open %s\n", output_file);
        fclose(infile);
        return;
    }

    // 初始化压缩结构体
    cinfo.err = jpeg_std_error(&jerr);
    jpeg_create_compress(&cinfo);

    // 设置输出文件流
    jpeg_stdio_dest(&cinfo, outfile);

    // 读取输入文件头信息
    unsigned char header[512];
    fread(header, sizeof(unsigned char), 512, infile);

    // 解析输入文件头信息
    unsigned int width = header[18] + header[19] * 256;
    unsigned int height = header[22] + header[23] * 256;

    // 设置压缩参数
    cinfo.image_width = width;
    cinfo.image_height = height;
    cinfo.input_components = 3;  // 在这里假设输入文件是RGB色彩模式
    cinfo.in_color_space = JCS_RGB;
    jpeg_set_defaults(&cinfo);
    jpeg_set_quality(&cinfo, quality, TRUE);

    // 开始压缩
    jpeg_start_compress(&cinfo, TRUE);

    // 写入每一行像素数据
    JSAMPROW row_pointer[1];
    while (cinfo.next_scanline < cinfo.image_height) {
        // 每次读取一行数据
        unsigned char row[width * cinfo.input_components];
        fread(row, sizeof(unsigned char), width * cinfo.input_components, infile);

        // 将数据转为libjpeg所需格式
        row_pointer[0] = row;

        // 写入到压缩结构体
        jpeg_write_scanlines(&cinfo, row_pointer, 1);
    }

    // 压缩结束
    jpeg_finish_compress(&cinfo);

    // 释放资源
    jpeg_destroy_compress(&cinfo);
    fclose(infile);
    fclose(outfile);
}

int main() {
    const char* input_file = "input.ppm";
    const char* output_file = "output.jpeg";
    int quality = 70;  // 压缩质量，范围为0-100，数值越高，质量越好

    compress_image(input_file, output_file, quality);

    printf("Image compression success\n");

    return 0;
}