package com.ruoyi.test;

import java.io.*;

public class ShpDebug {
    public static void main(String[] args) throws Exception {
        String shpPath = "d:\\Web\\PlatformModel\\ruoyi-admin\\uploads\\models\\geojson\\8aa64945328e428d97923165c8b8cf31\\流域.shp";
        
        FileInputStream fis = new FileInputStream(shpPath);
        fis.skip(100); // Skip header
        
        byte[] recordHeader = new byte[8];
        fis.read(recordHeader);
        
        int contentLengthWords = readIntBE(recordHeader, 4);
        int contentLength = contentLengthWords * 2;
        
        byte[] recordContent = new byte[contentLength];
        fis.read(recordContent);
        
        System.out.println("Content Length: " + contentLength);
        System.out.println("First 64 bytes (hex):");
        for (int i = 0; i < 64; i++) {
            System.out.printf("%02X ", recordContent[i]);
            if ((i + 1) % 16 == 0) System.out.println();
        }
        
        System.out.println("\n\nReading at offset 24-27 (numParts):");
        System.out.printf("Bytes: %02X %02X %02X %02X\n", 
            recordContent[24], recordContent[25], recordContent[26], recordContent[27]);
        System.out.println("As LE int: " + readIntLE(recordContent, 24));
        System.out.println("As BE int: " + readIntBE(recordContent, 24));
        
        System.out.println("\nReading at offset 28-31 (numPoints):");
        System.out.printf("Bytes: %02X %02X %02X %02X\n", 
            recordContent[28], recordContent[29], recordContent[30], recordContent[31]);
        System.out.println("As LE int: " + readIntLE(recordContent, 28));
        System.out.println("As BE int: " + readIntBE(recordContent, 28));
        
        fis.close();
    }
    
    static int readIntBE(byte[] data, int offset) {
        return ((data[offset] & 0xFF) << 24) |
               ((data[offset + 1] & 0xFF) << 16) |
               ((data[offset + 2] & 0xFF) << 8) |
               (data[offset + 3] & 0xFF);
    }
    
    static int readIntLE(byte[] data, int offset) {
        return (data[offset] & 0xFF) |
               ((data[offset + 1] & 0xFF) << 8) |
               ((data[offset + 2] & 0xFF) << 16) |
               ((data[offset + 3] & 0xFF) << 24);
    }
}