rustlol 0.1.1

A wad files lib
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297

use std::io::Read;
use std::ptr::null_mut;
use log::info;
use zstd::zstd_safe::compress_bound;

use crate::lol::io::bytes;
use crate::lol::io::bytes::MMap;
use crate::lol::io::bytes::Impl;
use crate::{lol_trace_func, lol_throw_if};

#[derive(Debug, Clone)]
pub struct Buffer {
        pub data_: *mut u8,
        pub size_: usize,
        pub impl_: Impl
}


impl Default for Buffer  {
    fn default() -> Self {
        let impl_: Impl = Impl { ref_count: 0, vec: Vec::<u8>::new(), mmp: MMap { file: null_mut(), data: null_mut(), size: 0 } }; 
        Self { data_: null_mut(), size_: 0, impl_ }
    }
}





impl Buffer {
    
    pub const KIB: usize = 1024; 
    pub const MIB: usize = 1024 * Self::KIB;
    pub const GIB: usize = 1024 * Self::MIB;

    pub fn data(&mut self) -> *mut u8 {
        self.data_
    }

    pub fn size(&self) -> usize {
        self.size_
    }


    pub fn write_decompress_zstd(&mut self, pos: usize, count: usize, src: &[u8],  src_count: usize) -> Result<(), std::io::Error> {
        let trace = lol_trace_func!(write_decompress_zstd, lol_trace_var!("{:#x}", size_),
                   lol_trace_var!("{:#x}", pos),
                   lol_trace_var!("{:#x}", count),
                   lol_trace_var!("{:p}", src),
                   lol_trace_var!("{:#x}", src_count));
        let maxendpos = pos +count;
        lol_throw_if!(maxendpos< pos, trace);
        lol_throw_if!(self.impl_reserve(maxendpos), trace);
        
        let mut de = zstd::Decoder::new(&src[..src_count])
            .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidData, format!("Failed to create zstd decoder: {}", e)))?;
        de.read_exact(&mut self.impl_.vec)
            .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidData, format!("Failed to decompress zstd data: {}", e)))?;
        

        self.size_ = self.size_.max(pos +count);
        Ok(())
    }

    pub fn impl_reserve(&mut self, size: usize) -> bool {
        self.impl_.vec.reserve(size);
        self.impl_.vec.resize(size, 0u8);
        if self.impl_.vec.len() ==  size {
            //println!( "size: {} len {}", size,  self.impl_.vec.len());
            false
        } else {
            true
        }
    }

    pub fn write_decompress_zstd_hack(&mut self, mut pos: usize, mut count: usize, src: &[u8],  mut src_count: usize) -> Result<(), std::io::Error> {
        let trace = lol_trace_func!(write_decompress_zstd_hack, lol_trace_var!("{:#x}", self.size_),
                   lol_trace_var!("{:#x}", pos),
                   lol_trace_var!("{:#x}", count),
                   lol_trace_var!("{:p}", src),
                   lol_trace_var!("{:#x}", src_count));
        let maxendpos = pos + count;
        lol_throw_if!(maxendpos < pos, trace);
        lol_throw_if!(self.impl_reserve(maxendpos), trace);        

        let farst_frame_start = Self::find_zstd_magic(&src);
        println!("ZstdMulti in  write_decompress_zstd_hack frame_start {:x}", farst_frame_start.unwrap());
        
        if farst_frame_start.is_some() {

            let mut i = 0;
             while let Some(next_farme_start) = Self::find_zstd_magic(&src[i..]) {
       
                let mut pos = pos;
                let mut count = count;
                let mut src_count = src_count;

                
                pos += next_farme_start+i;
                count -= next_farme_start+i;
                src_count -= next_farme_start+i;


                let _= self.write_decompress_zstd(pos, count, &src[next_farme_start+i..], src_count).map_err(|e| {
                    info!("{}", e);
                });
                    
                if count == 0 && src_count == 0 {
                    return Ok(());
                }
          

                i += pos +4;
                if i >= src.len() {
                
                   break;
                } 
            };

            pos += farst_frame_start.unwrap();
            count -= farst_frame_start.unwrap();
            src_count -= farst_frame_start.unwrap();
        }
        

 
        self.write_decompress_zstd(pos, count, &src[farst_frame_start.unwrap()..], src_count).unwrap();
        


        Ok(())
    }


    pub fn find_zstd_magic_offset_vec(src: &[u8]) -> Vec<usize>{
        const ZSTD_MAGIC: [u8; 4] = [0x28, 0xB5, 0x2F, 0xFD];
        let mut vec = Vec::<usize>::new();
        for (i, window) in src.windows(4).enumerate() {
            if window == ZSTD_MAGIC {
                if i == 0 {
                    vec.push(0xffffffff);
                } else {
                    vec.push(i);
                }
                
            }
        }

        vec
    }


    pub fn find_zstd_magic(src: &[u8]) -> Option<usize> {
        const ZSTD_MAGIC: [u8; 4] = [0x28, 0xB5, 0x2F, 0xFD];
        const ZSTD_SKIPPABLE_MIN: [u8; 4] = [0x50, 0x2A, 0x4D, 0x18]; // 可跳过帧的最小魔数
        const ZSTD_SKIPPABLE_MAX: [u8; 4] = [0x5F, 0x2A, 0x4D, 0x18]; // 可跳过帧的最大魔数

        if src.len() < 4 {
            return None;
        }

        // 查找标准zstd魔数
        if let Some(pos) = src.windows(4).position(|w| w == ZSTD_MAGIC) {

            return Some(pos);
        } 
  

       //查找可跳过的帧魔数范围
        for (_, window) in src.windows(4).enumerate() {
            if window[1..4] == ZSTD_SKIPPABLE_MIN[1..4] && 
               window[0] >= ZSTD_SKIPPABLE_MIN[0] && 
               window[0] <= ZSTD_SKIPPABLE_MAX[0] {
                return None;
            }
        }

        None
       
    }

    pub fn write_compress_zstd(&mut self, pos: usize,  src: &[u8],  src_count: usize, level: i32) -> Result<(), std::io::Error> {
        let trace = lol_trace_func!(write_compress_zstd, lol_trace_var!("{:#x}", self.size_),
                    lol_trace_var!("{:#x}", pos),
                    lol_trace_var!("{:p}", src),
                    lol_trace_var!("{:#x}", src_count));
        
        // 验证输入参数
        if src_count > src.len() {
            return Err(std::io::Error::new(std::io::ErrorKind::InvalidInput, 
                format!("src_count ({}) exceeds src length ({})", src_count, src.len())));
        }
        
        // 验证压缩级别范围 (zstd支持-7到22)
        let safe_level = level.clamp(-7, 22);
        if safe_level != level {
            info!("Warning: zstd compression level {} clamped to {}", level, safe_level);
        }
        
        // 只压缩实际需要的数据长度
        let actual_src = &src[..src_count.min(src.len())];
        let bound = compress_bound(actual_src.len());                
        let maxendpos = pos + bound;
        lol_throw_if!(maxendpos < pos, trace);
        lol_throw_if!(self.impl_reserve(maxendpos), trace);
        
        let result = zstd::encode_all(actual_src, safe_level)
            .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidData, format!("Failed to compress zstd data: {}", e)))?;
        
        let res_size = result.len();
        self.size_ = self.size_.max(pos + res_size);
        self.impl_.vec = result;
        Ok(())
    }
    pub fn copy_compress_zstd(&mut self, src: &[u8]) -> bytes::Bytes {
        // 使用pyzstd兼容的压缩参数
        self.copy_compress_zstd_compatible(src, 0) // pyzstd默认级别3
    }

    pub fn copy_compress_zstd_compatible(&mut self, src: &[u8], level: i32) -> bytes::Bytes {
        let mut result = bytes::Bytes::bytes();
        if let Err(e) = result.0.write_compress_zstd_compatible(0, src, src.len(), level) {
            info!("Failed to compress zstd data: {}", e);
        }
        return result;
    }

    pub fn write_compress_zstd_compatible(&mut self, pos: usize, src: &[u8], src_count: usize, level: i32) -> Result<(), std::io::Error> {
        // 验证输入参数
        if src_count > src.len() {
            return Err(std::io::Error::new(std::io::ErrorKind::InvalidInput, 
                format!("src_count ({}) exceeds src length ({})", src_count, src.len())));
        }

        // 使用与pyzstd兼容的压缩参数
        let safe_level = level.clamp(0, 22); // pyzstd通常使用1-22范围
        let actual_src = &src[..src_count.min(src.len())];
        
        // 使用zstd::stream模块进行更精确的控制
        let mut encoder = zstd::stream::Encoder::new(Vec::new(), safe_level)
            .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidData, format!("Failed to create zstd encoder: {}", e)))?;
        
        // 设置与pyzstd兼容的参数
        encoder.set_pledged_src_size(Some(actual_src.len() as u64))
            .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidData, format!("Failed to set src size: {}", e)))?;
        
        // 写入数据并完成压缩
        std::io::Write::write_all(&mut encoder, actual_src)
            .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidData, format!("Failed to write data: {}", e)))?;
        
        let result = encoder.finish()
            .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidData, format!("Failed to finish compression: {}", e)))?;
        
        let bound = compress_bound(actual_src.len());
        let maxendpos = pos + bound;
        let trace_compat = lol_trace_func!(write_compress_zstd_compatible, lol_trace_var!("{:#x}", pos));
        lol_throw_if!(maxendpos < pos, trace_compat);
        lol_throw_if!(self.impl_reserve(maxendpos), trace_compat);
        
        let res_size = result.len();
        self.size_ = self.size_.max(pos + res_size);
        self.impl_.vec = result;
        Ok(())
    }
    /// 专门为pyzstd兼容性设计的压缩函数
    pub fn write_compress_zstd_no_dict(&mut self, pos: usize, src: &[u8], src_count: usize, level: i32) -> Result<(), std::io::Error> {
        // 确保不使用字典压缩，与pyzstd完全兼容
        let safe_level = level.clamp(0, 22);
        let actual_src = &src[..src_count.min(src.len())];
        
        // 使用最基本的zstd压缩，不添加任何特殊参数
        let result = zstd::encode_all(actual_src, safe_level)
            .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidData, format!("Failed to compress: {}", e)))?;
        
        let bound = compress_bound(actual_src.len());
        let maxendpos = pos + bound;
        let trace_no_dict = lol_trace_func!(write_compress_zstd_no_dict, lol_trace_var!("{:#x}", pos));
        lol_throw_if!(maxendpos < pos, trace_no_dict);
        lol_throw_if!(self.impl_reserve(maxendpos), trace_no_dict);
        
        let res_size = result.len();
        self.impl_.vec = result;
        self.size_ = self.size_.max(pos + res_size);
        Ok(())
    }

    /// 简单的pyzstd兼容压缩
    pub fn copy_compress_zstd_simple(&mut self, src: &[u8]) -> bytes::Bytes {
        let mut result = bytes::Bytes::bytes();
        if let Err(e) = result.0.write_compress_zstd_no_dict(0, src, src.len(), 0) {
            info!("Failed to compress zstd data (simple): {}", e);
        }
        return result;
    }
}