jpeg2000 0.3.0

Rust bindings to OpenJPEG
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

/// jpeg2000: Rust bindings to the OpenJPEG library.
///
/// Copyright (C) 2010 Linden Research, Inc.
/// Copyright (C) 2017 Leonardo Schwarz <mail@leoschwarz.com>
///
/// This program is free software: you can redistribute it and/or modify
/// it under the terms of the GNU General Public License as published by
/// the Free Software Foundation, either version 3 of the License, or
/// (at your option) any later version.
///
/// This program is distributed in the hope that it will be useful,
/// but WITHOUT ANY WARRANTY; without even the implied warranty of
/// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
/// GNU General Public License for more details.
///
/// You should have received a copy of the GNU General Public License
/// along with this program.  If not, see <https://www.gnu.org/licenses/>.

use slog::Logger;
use std::ffi::CStr;
use std::os::raw::{c_char, c_void};
use std::slice;

pub struct LogHandlerData {
    logger: Logger,
}

impl LogHandlerData {
    pub fn new(logger: Logger) -> Self {
        LogHandlerData { logger: logger }
    }
}

pub struct NdUserdata<'a> {
    input_stream: bool,
    offset: usize,
    output: Vec<u8>,
    input: &'a [u8],
}

impl<'a> NdUserdata<'a> {
    pub fn new_input(data: &'a [u8]) -> Self {
        NdUserdata {
            input_stream: true,
            offset: 0,
            output: Vec::new(),
            input: data,
        }
    }
}

pub unsafe extern "C" fn nd_opj_stream_read_fn(
    p_buffer: *mut c_void,
    p_nb_bytes: usize,
    p_user_data: *mut c_void,
) -> usize {
    let userdata = p_user_data as *mut NdUserdata;
    assert!((*userdata).input_stream);

    let n_imgsize = (*userdata).input.len();
    let n_byteleft = n_imgsize - (*userdata).offset;

    let mut n_read = p_nb_bytes;

    if n_read > n_byteleft {
        n_read = n_byteleft;
    }

    if (*userdata).input.is_empty() || p_buffer.is_null() || n_read == 0 || n_byteleft == 0 {
        // TODO: The original returned -1 here,
        // but for some reason our signature is usize...
        return 0;
    }

    let target = slice::from_raw_parts_mut(p_buffer as *mut u8, n_read);
    let offset = (*userdata).offset;
    target.copy_from_slice(&(*userdata).input[offset..offset + n_read]);

    (*userdata).offset += n_read;

    n_read
}

pub unsafe extern "C" fn nd_opj_stream_write_fn(
    p_buffer: *mut c_void,
    p_nb_bytes: usize,
    p_user_data: *mut c_void,
) -> usize {
    let userdata = p_user_data as *mut NdUserdata;
    assert!(!(*userdata).input_stream);

    let buffer = p_buffer as *mut u8;

    (*userdata)
        .output
        .reserve((*userdata).output.len() + p_nb_bytes);
    (*userdata)
        .output
        .extend_from_slice(slice::from_raw_parts(buffer, p_nb_bytes));

    p_nb_bytes
}

pub unsafe extern "C" fn nd_opj_stream_skip_fn(p_nb_bytes: i64, p_user_data: *mut c_void) -> i64 {
    let userdata = p_user_data as *mut NdUserdata;
    assert!((*userdata).input_stream);

    let n_imgsize = (*userdata).input.len();
    let n_byteleft = (n_imgsize - (*userdata).offset) as i64;

    let mut n_skip = p_nb_bytes;

    if n_skip > n_byteleft {
        n_skip = n_byteleft;
    }

    (*userdata).offset += n_skip as usize;
    (*userdata).offset as i64
}

pub unsafe extern "C" fn nd_opj_stream_seek_fn(p_nb_bytes: i64, p_user_data: *mut c_void) -> i32 {
    let userdata = p_user_data as *mut NdUserdata;
    assert!((*userdata).input_stream);

    let n_imgsize = (*userdata).input.len();
    let n_seek = p_nb_bytes as usize;

    if n_seek > n_imgsize {
        0
    } else {
        (*userdata).offset = n_seek;
        1
    }
}

pub unsafe extern "C" fn info_handler(msg: *const c_char, p_data: *mut c_void) {
    let data = p_data as *mut LogHandlerData;
    info!((*data).logger, "{}", CStr::from_ptr(msg).to_string_lossy());
}

pub unsafe extern "C" fn warning_handler(msg: *const c_char, p_data: *mut c_void) {
    let data = p_data as *mut LogHandlerData;
    warn!((*data).logger, "{}", CStr::from_ptr(msg).to_string_lossy());
}

pub unsafe extern "C" fn error_handler(msg: *const c_char, p_data: *mut c_void) {
    let data = p_data as *mut LogHandlerData;
    error!((*data).logger, "{}", CStr::from_ptr(msg).to_string_lossy());
}