Question

我需要读取包含此结构的二进制文件：

struct iqmheader
{
    char magic[16]; // the string "INTERQUAKEMODEL\0", 0 terminated
    uint version; // must be version 2
    uint filesize;
    uint flags;
    uint num_text, ofs_text;
    uint num_meshes, ofs_meshes;
    uint num_vertexarrays, num_vertexes, ofs_vertexarrays;
    uint num_triangles, ofs_triangles, ofs_adjacency;
    uint num_joints, ofs_joints;
    uint num_poses, ofs_poses;
    uint num_anims, ofs_anims;
    uint num_frames, num_framechannels, ofs_frames, ofs_bounds;
    uint num_comment, ofs_comment;
    uint num_extensions, ofs_extensions; 
};

有一种优雅的方式吗？我以这种方式尝试了javolution lib：

import javolution.io.Struct;
import java.nio.ByteOrder;

public class IqmHeader extends Struct {
    public final UTF8String magic = new UTF8String(16);
    public final Unsigned8 version = new Unsigned8();
    public final Unsigned8 filesize = new Unsigned8();   
}

前两个值（魔术和版本）是正确的但是对于第三个值我已经得到0这是错误的。

用Hex Editor打开文件（第一个字节，而不是整个文件）：

以下是十六进制编辑器的输出：

49 4E 54 45 52 51 55 41 4B 45 4D 4F 44 45 4C 00 02 00 00 00 10 EF 03 00 00 00 00 00 60 03 00 00 7C 00 00 00 02 00 00 00 DC 03 00 00 06 00 00 00 45 07 00 00 0C 04 00 00 AC 0B 00 00 A0 9B 01 00 B0 27 02 00 4B 00 00 00 C0 B3 02 00 4B 00 00 00 D0 C1 02 00 01 00 00 00 98 DB 02 00 65 00 00 00 4D 01 00 00 AC DB 02 00 70 E2 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 42 6F 64

我必须承认我真的不知道怎么读这个。前16个字节是后跟“00”的字符串。那么版本“02” - 这里我不知道uint需要多少字节

有什么建议吗？

Answer 1

使用DataInputStream和readUnsignedByte，readUnsignedShort，readUTF等来创建结构。

您可以使用Java类来表示结构：

public class IQMHeader {
    String magic; // the string "INTERQUAKEMODEL\0", 0 terminated
    long version; // must be version 2
    long filesize;
    long flags;
    long num_text, ofs_text;
    long num_meshes, ofs_meshes;
    long num_vertexarrays, num_vertexes, ofs_vertexarrays;
    long num_triangles, ofs_triangles, ofs_adjacency;
    long num_joints, ofs_joints;
    long num_poses, ofs_poses;
    long num_anims, ofs_anims;
    long num_frames, num_framechannels, ofs_frames, ofs_bounds;
    long num_comment, ofs_comment;
    long num_extensions, ofs_extensions; 
};

您可以像这样阅读unsigned int：

long unsigned = input.readInt() & 0xffffffffL;

Answer 2

如评论所述，您可能希望尝试使用Unsigned32来表示Java类中的版本和其他C int而不是Unsigned8，因为C int应该是4个字节而Unsigned8只代表1个字节。

Java读取二进制结构

2 个答案: