/rust/registry/src/index.crates.io-6f17d22bba15001f/ring-0.17.14/src/io/writer.rs

Source (jump to first uncovered line)
// Copyright 2018 Brian Smith.
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

use alloc::{boxed::Box, vec::Vec};

pub trait Accumulator {
    fn write_byte(&mut self, value: u8) -> Result<(), TooLongError>;
    fn write_bytes(&mut self, value: &[u8]) -> Result<(), TooLongError>;
}

pub(super) struct LengthMeasurement {
    len: usize,
}

impl From<LengthMeasurement> for usize {
    fn from(len: LengthMeasurement) -> usize {
        len.len
    }
}

impl LengthMeasurement {
    pub fn zero() -> Self {
        Self { len: 0 }
    }
}

impl Accumulator for LengthMeasurement {
    fn write_byte(&mut self, _value: u8) -> Result<(), TooLongError> {
        self.len = self.len.checked_add(1).ok_or_else(TooLongError::new)?;
        Ok(())
    }
    fn write_bytes(&mut self, value: &[u8]) -> Result<(), TooLongError> {
        self.len = self
            .len
            .checked_add(value.len())
            .ok_or_else(TooLongError::new)?;
        Ok(())
    }
}

pub(super) struct Writer {
    bytes: Vec<u8>,
    requested_capacity: usize,
}

impl Writer {
    pub(super) fn with_capacity(capacity: LengthMeasurement) -> Self {
        Self {
            bytes: Vec::with_capacity(capacity.len),
            requested_capacity: capacity.len,
        }
    }
}

impl From<Writer> for Box<[u8]> {
    fn from(writer: Writer) -> Self {
        assert_eq!(writer.requested_capacity, writer.bytes.len());
        writer.bytes.into_boxed_slice()
    }
}

impl Accumulator for Writer {
    fn write_byte(&mut self, value: u8) -> Result<(), TooLongError> {
        self.bytes.push(value);
        Ok(())
    }
    fn write_bytes(&mut self, value: &[u8]) -> Result<(), TooLongError> {
        self.bytes.extend(value);
        Ok(())
    }
}

pub fn write_copy(
    accumulator: &mut dyn Accumulator,
    to_copy: untrusted::Input,
) -> Result<(), TooLongError> {
    accumulator.write_bytes(to_copy.as_slice_less_safe())
}

pub struct TooLongError(());

impl TooLongError {
    pub fn new() -> Self {
        Self(())
    }
}

Line	Count	Source (jump to first uncovered line)
1		// Copyright 2018 Brian Smith.
2		//
3		// Permission to use, copy, modify, and/or distribute this software for any
4		// purpose with or without fee is hereby granted, provided that the above
5		// copyright notice and this permission notice appear in all copies.
6		//
7		// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
8		// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9		// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
10		// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11		// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12		// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13		// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
14
15		use alloc::{boxed::Box, vec::Vec};
16
17		pub trait Accumulator {
18		fn write_byte(&mut self, value: u8) -> Result<(), TooLongError>;
19		fn write_bytes(&mut self, value: &[u8]) -> Result<(), TooLongError>;
20		}
21
22		pub(super) struct LengthMeasurement {
23		len: usize,
24		}
25
26		impl From<LengthMeasurement> for usize {
27	0	fn from(len: LengthMeasurement) -> usize {
28	0	len.len
29	0	}
30		}
31
32		impl LengthMeasurement {
33	0	pub fn zero() -> Self {
34	0	Self { len: 0 }
35	0	}
36		}
37
38		impl Accumulator for LengthMeasurement {
39	0	fn write_byte(&mut self, _value: u8) -> Result<(), TooLongError> {
40	0	self.len = self.len.checked_add(1).ok_or_else(TooLongError::new)?;
41	0	Ok(())
42	0	}
43	0	fn write_bytes(&mut self, value: &[u8]) -> Result<(), TooLongError> {
44	0	self.len = self
45	0	.len
46	0	.checked_add(value.len())
47	0	.ok_or_else(TooLongError::new)?;
48	0	Ok(())
49	0	}
50		}
51
52		pub(super) struct Writer {
53		bytes: Vec<u8>,
54		requested_capacity: usize,
55		}
56
57		impl Writer {
58	0	pub(super) fn with_capacity(capacity: LengthMeasurement) -> Self {
59	0	Self {
60	0	bytes: Vec::with_capacity(capacity.len),
61	0	requested_capacity: capacity.len,
62	0	}
63	0	}
64		}
65
66		impl From<Writer> for Box<[u8]> {
67	0	fn from(writer: Writer) -> Self {
68	0	assert_eq!(writer.requested_capacity, writer.bytes.len());
69	0	writer.bytes.into_boxed_slice()
70	0	}
71		}
72
73		impl Accumulator for Writer {
74	0	fn write_byte(&mut self, value: u8) -> Result<(), TooLongError> {
75	0	self.bytes.push(value);
76	0	Ok(())
77	0	}
78	0	fn write_bytes(&mut self, value: &[u8]) -> Result<(), TooLongError> {
79	0	self.bytes.extend(value);
80	0	Ok(())
81	0	}
82		}
83
84	0	pub fn write_copy(
85	0	accumulator: &mut dyn Accumulator,
86	0	to_copy: untrusted::Input,
87	0	) -> Result<(), TooLongError> {
88	0	accumulator.write_bytes(to_copy.as_slice_less_safe())
89	0	}
90
91		pub struct TooLongError(());
92
93		impl TooLongError {
94	0	pub fn new() -> Self {
95	0	Self(())
96	0	}
97		}

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Created: 2025-07-18 06:08