miniz_oxide/
lib.rs

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
//! A pure rust replacement for the [miniz](https://github.com/richgel999/miniz)
//! DEFLATE/zlib encoder/decoder.
//! The plan for this crate is to be used as a back-end for the
//! [flate2](https://github.com/alexcrichton/flate2-rs) crate and eventually remove the
//! need to depend on a C library.
//!
//! # Usage
//! ## Simple compression/decompression:
//! ``` rust
//!
//! use miniz_oxide::inflate::decompress_to_vec;
//! use miniz_oxide::deflate::compress_to_vec;
//!
//! fn roundtrip(data: &[u8]) {
//!     let compressed = compress_to_vec(data, 6);
//!     let decompressed = decompress_to_vec(compressed.as_slice()).expect("Failed to decompress!");
//! #   let _ = decompressed;
//! }
//!
//! # roundtrip(b"Test_data test data lalalal blabla");
//!
//! ```

#![forbid(unsafe_code)]

extern crate adler32;

pub mod deflate;
pub mod inflate;
mod shared;

pub use crate::shared::update_adler32 as mz_adler32_oxide;
pub use crate::shared::{MZ_ADLER32_INIT, MZ_DEFAULT_WINDOW_BITS};

/// A list of flush types.
///
/// See [http://www.bolet.org/~pornin/deflate-flush.html] for more in-depth info.
#[repr(i32)]
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub enum MZFlush {
    /// Don't force any flushing.
    /// Used when more input data is expected.
    None = 0,
    /// Zlib partial flush.
    /// Currently treated as `Sync`.
    Partial = 1,
    /// Finish compressing the currently buffered data, and output an empty raw block.
    /// Has no use in decompression.
    Sync = 2,
    /// Same as `Sync`, but resets the compression dictionary so that further compressed
    /// data does not depend on data compressed before the flush.
    /// Has no use in decompression.
    Full = 3,
    /// Attempt to flush the remaining data and end the stream.
    Finish = 4,
    /// Not implemented.
    Block = 5,
}

impl MZFlush {
    /// Create an MZFlush value from an integer value.
    ///
    /// Returns `MZError::Param` on invalid values.
    pub fn new(flush: i32) -> Result<Self, MZError> {
        match flush {
            0 => Ok(MZFlush::None),
            1 | 2 => Ok(MZFlush::Sync),
            3 => Ok(MZFlush::Full),
            4 => Ok(MZFlush::Finish),
            _ => Err(MZError::Param),
        }
    }
}

/// A list of miniz successful status codes.
#[repr(i32)]
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub enum MZStatus {
    Ok = 0,
    StreamEnd = 1,
    NeedDict = 2,
}

/// A list of miniz failed status codes.
#[repr(i32)]
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub enum MZError {
    ErrNo = -1,
    Stream = -2,
    Data = -3,
    Mem = -4,
    Buf = -5,
    Version = -6,
    Param = -10_000,
}

/// How compressed data is wrapped.
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub enum DataFormat {
    /// Wrapped using the [zlib](http://www.zlib.org/rfc-zlib.html) format.
    Zlib,
    /// Raw DEFLATE.
    Raw,
}

impl DataFormat {
    pub(crate) fn from_window_bits(window_bits: i32) -> DataFormat {
        if window_bits > 0 {
            DataFormat::Zlib
        } else {
            DataFormat::Raw
        }
    }

    pub(crate) fn to_window_bits(self) -> i32 {
        match self {
            DataFormat::Zlib => shared::MZ_DEFAULT_WINDOW_BITS,
            DataFormat::Raw => -shared::MZ_DEFAULT_WINDOW_BITS,
        }
    }
}

/// `Result` alias for all miniz status codes both successful and failed.
pub type MZResult = Result<MZStatus, MZError>;

/// A structure containg the result of a call to the inflate or deflate streaming functions.
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub struct StreamResult {
    /// The number of bytes consumed from the input slice.
    pub bytes_consumed: usize,
    /// The number of bytes written to the output slice.
    pub bytes_written: usize,
    /// The return status of the call.
    pub status: MZResult,
}

impl StreamResult {
    #[inline]
    pub(crate) fn error(error: MZError) -> StreamResult {
        StreamResult {
            bytes_consumed: 0,
            bytes_written: 0,
            status: Err(error),
        }
    }
}

impl std::convert::From<StreamResult> for MZResult {
    fn from(res: StreamResult) -> Self {
        res.status
    }
}

impl std::convert::From<&StreamResult> for MZResult {
    fn from(res: &StreamResult) -> Self {
        res.status
    }
}