linux 64位读取bmp

#include <stdio.h>
#include <stdlib.h>

#pragma pack(push, 1)
typedef struct {
    unsigned short bfType;
    unsigned int bfSize;
    unsigned short bfReserved1;
    unsigned short bfReserved2;
    unsigned int bfOffBits;
} BITMAPFILEHEADER;

typedef struct {
    unsigned int biSize;
    int biWidth;
    int biHeight;
    unsigned short biPlanes;
    unsigned short biBitCount;
    unsigned int biCompression;
    unsigned int biSizeImage;
    int biXPelsPerMeter;
    int biYPelsPerMeter;
    unsigned int biClrUsed;
    unsigned int biClrImportant;
} BITMAPINFOHEADER;
#pragma pack(pop)

int main() {
    FILE *file = fopen("example.bmp", "rb");
    if (!file) {
        perror("Failed to open file");
        return 1;
    }

    BITMAPFILEHEADER fileHeader;
    fread(&fileHeader, sizeof(BITMAPFILEHEADER), 1, file);

    if (fileHeader.bfType != 0x4D42) { // 'BM'
        printf("Not a BMP file\n");
        fclose(file);
        return 1;
    }

    BITMAPINFOHEADER infoHeader;
    fread(&infoHeader, sizeof(BITMAPINFOHEADER), 1, file);

    printf("Width: %d, Height: %d, BitCount: %d\n", infoHeader.biWidth, infoHeader.biHeight, infoHeader.biBitCount);

    fclose(file);
    return 0;
}