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
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
#![cfg(not(feature="safe"))]

#[cfg(feature="std")]
use std::{thread,panic, io, boxed, any, string};
#[cfg(feature="std")]
use std::io::Write;
use core;
use core::slice;
use core::ops;
pub mod interface;
pub mod alloc_util;
use self::alloc_util::SubclassableAllocator;
use alloc::{Allocator, SliceWrapper, SliceWrapperMut, StackAllocator, AllocatedStackMemory, bzero};
use self::interface::{CAllocator, c_void, BrotliDecoderParameter, BrotliDecoderResult, brotli_alloc_func, brotli_free_func};
use ::BrotliResult;
use ::BrotliDecoderReturnInfo;
use ::brotli_decode;
pub use ::HuffmanCode;
pub use super::state::{BrotliDecoderErrorCode, BrotliState};

pub unsafe fn slice_from_raw_parts_or_nil<'a, T>(data: *const T, len: usize) -> &'a [T] {
    if len == 0 {
        return &[];
    }
    slice::from_raw_parts(data, len)
}

pub unsafe fn slice_from_raw_parts_or_nil_mut<'a, T>(data: *mut T, len: usize) -> &'a mut [T] {
    if len == 0 {
        return &mut [];
    }
    slice::from_raw_parts_mut(data, len)
}

#[cfg(feature="std")]
type BrotliAdditionalErrorData = boxed::Box<dyn any::Any + Send + 'static>;
#[cfg(not(feature="std"))]
type BrotliAdditionalErrorData = ();

#[repr(C)]
pub struct BrotliDecoderState {
    pub custom_allocator: CAllocator,
    pub decompressor: ::BrotliState<SubclassableAllocator,
                                    SubclassableAllocator,
                                    SubclassableAllocator>,
}

#[cfg(not(feature="std"))]
fn brotli_new_decompressor_without_custom_alloc(_to_box: BrotliDecoderState) -> *mut BrotliDecoderState{
    panic!("Must supply allocators if calling divans when compiled without features=std");
}

#[cfg(feature="std")]
fn brotli_new_decompressor_without_custom_alloc(to_box: BrotliDecoderState) -> *mut BrotliDecoderState{
    alloc_util::Box::<BrotliDecoderState>::into_raw(
        alloc_util::Box::<BrotliDecoderState>::new(to_box))
}


#[no_mangle]
pub unsafe extern fn BrotliDecoderCreateInstance(
    alloc_func: brotli_alloc_func,
    free_func: brotli_free_func,
    opaque: *mut c_void,
) -> *mut BrotliDecoderState {
    match catch_panic_state(|| {
      let allocators = CAllocator {
        alloc_func:alloc_func,
        free_func:free_func,
        opaque:opaque,
      };
      let custom_dictionary = <SubclassableAllocator as Allocator<u8>>::AllocatedMemory::default();
      let to_box = BrotliDecoderState {
        custom_allocator: allocators.clone(),
        decompressor: ::BrotliState::new_with_custom_dictionary(
          SubclassableAllocator::new(allocators.clone()),
          SubclassableAllocator::new(allocators.clone()),
          SubclassableAllocator::new(allocators.clone()),
          custom_dictionary,
        ),
      };
      if let Some(alloc) = alloc_func {
        if free_func.is_none() {
            panic!("either both alloc and free must exist or neither");
        }
        let ptr = alloc(allocators.opaque, core::mem::size_of::<BrotliDecoderState>());
        let brotli_decoder_state_ptr = core::mem::transmute::<*mut c_void, *mut BrotliDecoderState>(ptr);
        core::ptr::write(brotli_decoder_state_ptr, to_box);
        brotli_decoder_state_ptr
      } else {
        brotli_new_decompressor_without_custom_alloc(to_box)
      }
    }) {
        Ok(ret) => ret,
        Err(mut e) => {
            error_print(core::ptr::null_mut(), &mut e);
            core::ptr::null_mut()
        },
    }
}

#[no_mangle]
pub unsafe extern fn BrotliDecoderSetParameter(_state_ptr: *mut BrotliDecoderState,
                                       _selector: BrotliDecoderParameter,
                                       _value: u32) {
  // not implemented
}

#[no_mangle]
pub unsafe extern fn BrotliDecoderDecompressPrealloc(
  encoded_size: usize,
  encoded_buffer: *const u8,
  decoded_size: usize,
  decoded_buffer: *mut u8,
  scratch_u8_size: usize,
  scratch_u8_buffer: *mut u8,
  scratch_u32_size: usize,
  scratch_u32_buffer: *mut u32,
  scratch_hc_size: usize,
  scratch_hc_buffer: *mut HuffmanCode,
) -> BrotliDecoderReturnInfo {
  let input = slice_from_raw_parts_or_nil(encoded_buffer, encoded_size);
  let output = slice_from_raw_parts_or_nil_mut(decoded_buffer, decoded_size);
  let scratch_u8 = slice_from_raw_parts_or_nil_mut(scratch_u8_buffer, scratch_u8_size);
  let scratch_u32 = slice_from_raw_parts_or_nil_mut(scratch_u32_buffer, scratch_u32_size);
  let scratch_hc = slice_from_raw_parts_or_nil_mut(scratch_hc_buffer, scratch_hc_size);
  ::brotli_decode_prealloc(input, output, scratch_u8, scratch_u32, scratch_hc)
}


#[no_mangle]
pub unsafe extern fn BrotliDecoderDecompressWithReturnInfo(
  encoded_size: usize,
  encoded_buffer: *const u8,
  decoded_size: usize,
  decoded_buffer: *mut u8,
) -> BrotliDecoderReturnInfo {
  let input = slice_from_raw_parts_or_nil(encoded_buffer, encoded_size);
  let output_scratch = slice_from_raw_parts_or_nil_mut(decoded_buffer, decoded_size);
  ::brotli_decode(input, output_scratch)
}

#[no_mangle]
pub unsafe extern fn BrotliDecoderDecompress(
  encoded_size: usize,
  encoded_buffer: *const u8,
  decoded_size: *mut usize,
  decoded_buffer: *mut u8,
) -> BrotliDecoderResult {
  let res = BrotliDecoderDecompressWithReturnInfo(encoded_size, encoded_buffer, *decoded_size, decoded_buffer);
  *decoded_size = res.decoded_size;  
  match res.result {
      BrotliResult::ResultSuccess => BrotliDecoderResult::BROTLI_DECODER_RESULT_SUCCESS,
      _ => BrotliDecoderResult::BROTLI_DECODER_RESULT_ERROR
  }
}

#[cfg(all(feature="std", not(feature="pass-through-ffi-panics")))]
fn catch_panic<F:FnOnce()->BrotliDecoderResult+panic::UnwindSafe>(f: F) -> thread::Result<BrotliDecoderResult> {
    panic::catch_unwind(f)
}

#[cfg(all(feature="std", not(feature="pass-through-ffi-panics")))]
fn catch_panic_state<F:FnOnce()->*mut BrotliDecoderState+panic::UnwindSafe>(f: F) -> thread::Result<*mut BrotliDecoderState> {
    panic::catch_unwind(f)
}

#[cfg(all(feature="std", not(feature="pass-through-ffi-panics")))]
unsafe fn error_print(state_ptr: *mut BrotliDecoderState, err: &mut BrotliAdditionalErrorData) {
    if let Some(st) = err.downcast_ref::<&str>() {
        if !state_ptr.is_null() {
          let mut str_cpy = [0u8;256];
          let src:&[u8] = st.as_ref();
          let xlen = core::cmp::min(src.len(), str_cpy.len() - 1);
          str_cpy.split_at_mut(xlen).0.clone_from_slice(
                src.split_at(xlen).0);
          str_cpy[xlen] = 0; // null terminate
          (*state_ptr).decompressor.mtf_or_error_string = Err(str_cpy);
        }
        let _ign = writeln!(&mut io::stderr(), "panic: {}", st);
    } else {
        if let Some(st) = err.downcast_ref::<string::String>() {

          if !state_ptr.is_null() {
            let mut str_cpy = [0u8;256];
            let src: &[u8] = st.as_ref();
            let xlen = core::cmp::min(src.len(), str_cpy.len() - 1);
            str_cpy.split_at_mut(xlen).0.clone_from_slice(
                src.split_at(xlen).0);
            str_cpy[xlen] = 0; // null terminate
            (*state_ptr).decompressor.mtf_or_error_string = Err(str_cpy);
          }
          let _ign = writeln!(&mut io::stderr(), "Internal Error {:?}", st);
        } else {
            let _ign = writeln!(&mut io::stderr(), "Internal Error {:?}", err);
        }
    }
}

// can't catch panics in a reliable way without std:: configure with panic=abort. These shouldn't happen
#[cfg(any(not(feature="std"), feature="pass-through-ffi-panics"))]
fn catch_panic<F:FnOnce()->BrotliDecoderResult>(f: F) -> Result<BrotliDecoderResult, BrotliAdditionalErrorData> {
    Ok(f())
}

#[cfg(any(not(feature="std"), feature="pass-through-ffi-panics"))]
fn catch_panic_state<F:FnOnce()->*mut BrotliDecoderState>(f: F) -> Result<*mut BrotliDecoderState, BrotliAdditionalErrorData> {
    Ok(f())
}

#[cfg(any(not(feature="std"), feature="pass-through-ffi-panics"))]
fn error_print(_state_ptr: *mut BrotliDecoderState, _err: &mut BrotliAdditionalErrorData) {
}

#[no_mangle]
pub unsafe extern fn BrotliDecoderDecompressStream(
    state_ptr: *mut BrotliDecoderState,
    available_in: *mut usize,
    input_buf_ptr: *mut*const u8,
    available_out: *mut usize,
    output_buf_ptr: *mut*mut u8,
    mut total_out: *mut usize) -> BrotliDecoderResult {
    match catch_panic(move || {
    let mut input_offset = 0usize;
    let mut output_offset = 0usize;
    let mut fallback_total_out = 0usize;
    if total_out.is_null() {
        total_out = &mut fallback_total_out;
    }
    let result: BrotliDecoderResult;
    {
        let input_buf = slice_from_raw_parts_or_nil(*input_buf_ptr, *available_in);
        let output_buf = slice_from_raw_parts_or_nil_mut(*output_buf_ptr, *available_out);
            result = super::decode::BrotliDecompressStream(
                &mut *available_in,
                &mut input_offset,
                input_buf,
                &mut *available_out,
                &mut output_offset,
                output_buf,
                &mut *total_out,
                &mut (*state_ptr).decompressor,
            ).into();
    }
    *input_buf_ptr = (*input_buf_ptr).offset(input_offset as isize);
    *output_buf_ptr = (*output_buf_ptr).offset(output_offset as isize);
                                           result
    }) {
        Ok(ret) => ret,
        Err(mut readable_err) => { // if we panic (completely unexpected) then we should report it back to C and print
            error_print(state_ptr, &mut readable_err);
            (*state_ptr).decompressor.error_code = BrotliDecoderErrorCode::BROTLI_DECODER_ERROR_UNREACHABLE;
            BrotliDecoderResult::BROTLI_DECODER_RESULT_ERROR
        }
    }
}

/// Equivalent to BrotliDecoderDecompressStream but with no optional arg and no double indirect ptrs
#[no_mangle]
pub unsafe extern fn BrotliDecoderDecompressStreaming(
    state_ptr: *mut BrotliDecoderState,
    available_in: *mut usize,
    mut input_buf_ptr: *const u8,
    available_out: *mut usize,
    mut output_buf_ptr: *mut u8) -> BrotliDecoderResult {
    BrotliDecoderDecompressStream(state_ptr,
                                  available_in,
                                  &mut input_buf_ptr,
                                  available_out,
                                  &mut output_buf_ptr,
                                  core::ptr::null_mut())
}

#[cfg(feature="std")]
unsafe fn free_decompressor_no_custom_alloc(state_ptr: *mut BrotliDecoderState) {
    let _state = alloc_util::Box::from_raw(state_ptr);
}

#[cfg(not(feature="std"))]
unsafe fn free_decompressor_no_custom_alloc(_state_ptr: *mut BrotliDecoderState) {
    unreachable!();
}


#[no_mangle]
pub unsafe extern fn BrotliDecoderMallocU8(state_ptr: *mut BrotliDecoderState, size: usize) -> *mut u8 {
    if let Some(alloc_fn) = (*state_ptr).custom_allocator.alloc_func {
        return core::mem::transmute::<*mut c_void, *mut u8>(alloc_fn((*state_ptr).custom_allocator.opaque, size));
    } else {
        return alloc_util::alloc_stdlib(size);
    }
}

#[no_mangle]
pub unsafe extern fn BrotliDecoderFreeU8(state_ptr: *mut BrotliDecoderState, data: *mut u8, size: usize) {
    if let Some(free_fn) = (*state_ptr).custom_allocator.free_func {
        free_fn((*state_ptr).custom_allocator.opaque, core::mem::transmute::<*mut u8, *mut c_void>(data));
    } else {
        alloc_util::free_stdlib(data, size);
    }
}

#[no_mangle]
pub unsafe extern fn BrotliDecoderMallocUsize(state_ptr: *mut BrotliDecoderState, size: usize) -> *mut usize {
    if let Some(alloc_fn) = (*state_ptr).custom_allocator.alloc_func {
        return core::mem::transmute::<*mut c_void, *mut usize>(alloc_fn((*state_ptr).custom_allocator.opaque,
                                                                         size * core::mem::size_of::<usize>()));
    } else {
        return alloc_util::alloc_stdlib(size);
    }
}
#[no_mangle]
pub unsafe extern fn BrotliDecoderFreeUsize(state_ptr: *mut BrotliDecoderState, data: *mut usize, size: usize) {
    if let Some(free_fn) = (*state_ptr).custom_allocator.free_func {
        free_fn((*state_ptr).custom_allocator.opaque, core::mem::transmute::<*mut usize, *mut c_void>(data));
    } else {
        alloc_util::free_stdlib(data, size);
    }
}

#[no_mangle]
pub unsafe extern fn BrotliDecoderDestroyInstance(state_ptr: *mut BrotliDecoderState) {
    if let Some(_) = (*state_ptr).custom_allocator.alloc_func {
        if let Some(free_fn) = (*state_ptr).custom_allocator.free_func {
            let _to_free = core::ptr::read(state_ptr);
            let ptr = core::mem::transmute::<*mut BrotliDecoderState, *mut c_void>(state_ptr);
            free_fn((*state_ptr).custom_allocator.opaque, ptr);
        }
    } else {
        free_decompressor_no_custom_alloc(state_ptr);
    }
}

#[no_mangle]
pub unsafe extern fn BrotliDecoderHasMoreOutput(state_ptr: *const BrotliDecoderState) -> i32 {
  if super::decode::BrotliDecoderHasMoreOutput(&(*state_ptr).decompressor) {1} else {0}
}

#[no_mangle]
pub unsafe extern fn BrotliDecoderTakeOutput(state_ptr: *mut BrotliDecoderState, size: *mut usize) -> *const u8 {
  super::decode::BrotliDecoderTakeOutput(&mut (*state_ptr).decompressor, &mut *size).as_ptr()
}



#[no_mangle]
pub unsafe extern fn BrotliDecoderIsUsed(state_ptr: *const BrotliDecoderState) -> i32 {
  if super::decode::BrotliDecoderIsUsed(&(*state_ptr).decompressor) {1} else {0}
}
#[no_mangle]
pub unsafe extern fn BrotliDecoderIsFinished(state_ptr: *const BrotliDecoderState) -> i32 {
  if super::decode::BrotliDecoderIsFinished(&(*state_ptr).decompressor) {1} else {0}
}
#[no_mangle]
pub unsafe extern fn BrotliDecoderGetErrorCode(state_ptr: *const BrotliDecoderState) -> BrotliDecoderErrorCode {
  super::decode::BrotliDecoderGetErrorCode(&(*state_ptr).decompressor)
}

#[no_mangle]
pub unsafe extern fn BrotliDecoderGetErrorString(state_ptr: *const BrotliDecoderState) -> *const u8 {
  if !state_ptr.is_null() {
    if let &Err(ref msg) = &(*state_ptr).decompressor.mtf_or_error_string {
      // important: this must be a ref
      // so stack memory is not returned
      return msg.as_ptr();
    }
  }
  BrotliDecoderErrorString(super::decode::BrotliDecoderGetErrorCode(&(*state_ptr).decompressor))
}
#[no_mangle]
pub extern fn BrotliDecoderErrorString(c: BrotliDecoderErrorCode) -> *const u8 {
    ::state::BrotliDecoderErrorStr(c).as_ptr()
}


#[no_mangle]
pub extern fn BrotliDecoderVersion() -> u32 {
  0x1000f00
}