Cgo中二维数组的转换问题？？

Question

package main

/*
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

struct node{
    unsigned char** p;
};

unsigned char ** f1() {
    int i, j;
    unsigned char ** original = (unsigned char **)malloc(8);
    for(i = 0; i < 8; i++)
    {
        original[i] = (unsigned char *)malloc(1024);
        for(j = 0; j < 1024; j++)
        {
            original[i][j] = (unsigned char)(j);
        }
    }
    return original;
}
void f2(unsigned char **arr) {
    int i, j;
    printf("f2\n");
    for(i = 0; i < 8; i++)
    {
        printf("i=%d\n", i);
        for(j = 0; j < 1024; j++)
        {
            printf("%02x", arr[i][j]);
        }
        printf("\n\n");
    }
}
*/
import "C"
import "fmt"
import "unsafe"

func main() {
    var dirs [8][1024]byte
    //dirs := make([][]byte, 8)
    for i := 0; i < 8; i++ {
        fmt.Println("i=", i)
        //dirs[i] = make([]byte, 1024)
        for j := 0; j < 1024; j++ {
            dirs[i][j] = byte(j)
        }
        fmt.Printf("%x\n", dirs[i])
    }

    C.f2((**C.uchar)(unsafe.Pointer(&dirs[0][0])))

    buf := C.f1()
    decodeBuf := uintptr(unsafe.Pointer(buf))
    var enBuf [8][1024]byte
    for i := 0; i < 8; i++ {
        for k := 0; k < 1024; k++ {
            tBuf := unsafe.Pointer(decodeBuf)
            enBuf[i][k] = *(*byte)(tBuf)
            decodeBuf += unsafe.Sizeof(enBuf[i][k])
        }
        fmt.Printf("%d buf=%x\n", len(enBuf[i]), enBuf[i])
    }
}

c为什么不能访问Go中的数据
Go访问c中的数据时发现数据有偏移
求解释？？