28525681214

Committed 01 Jul 2026 02:39PM UTC coverage: 44.084% (+0.1%) from 43.952%

Build # 28525681214

Build Type

push

github

Committed by

vigna

Commit Message

Removed MIGHT_BE_ZERO_COPY, as IS_ZERO_COPY subsumes it (final part)

Coverage Stats

883 of 2003 relevant lines covered (44.08%)

449.05 hits per line

Source File
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92.86

/epserde/src/impls/string.rs

/*
 * SPDX-FileCopyrightText: 2023 Inria
 * SPDX-FileCopyrightText: 2023 Sebastiano Vigna
 *
 * SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later
 */

//! Implementations for strings.
//!
//! All string types have the same serialization type, `Box<str>`, and the same
//! deserialization type, `&str`. Thus, you can serialize a `String` and fully
//! deserialize it as `Box<str>`.
//!
//! Similarly to the case of [slices](crate::impls::slice), there is
//! a convenience [`SerInner`] implementation for `&str` that
//! serializes it as `Box<str>`.
//!
//! We implement [`TypeHash`] for `str` so that it can be used in
//! [`PhantomData`](core::marker::PhantomData).

use crate::{check_covariance, prelude::*};
use core::hash::Hash;
use deser::*;
use ser::*;

#[cfg(not(feature = "std"))]
use alloc::boxed::Box;

unsafe impl CopyType for String {
    type Copy = Deep;
}

#[cfg(not(feature = "std"))]
use alloc::string::String;

impl TypeHash for String {
    fn type_hash(hasher: &mut impl core::hash::Hasher) {
        "String".hash(hasher);
    }
}

impl SerInner for String {
    type SerType = Box<str>;
    const IS_ZERO_COPY: bool = false;

    unsafe fn _ser_inner(&self, backend: &mut impl WriteWithNames) -> ser::Result<()> {
        ser_slice_zero(backend, self.as_bytes())
    }
}

impl DeserInner for String {
    check_covariance!();
    unsafe fn _deser_full_inner(backend: &mut impl ReadWithPos) -> deser::Result<Self> {
        let slice = unsafe { deser_full_vec_zero(backend) }?;
        String::from_utf8(slice).map_err(|_| deser::Error::InvalidData)
    }

    type DeserType<'a> = &'a str;

    unsafe fn _deser_eps_inner<'a>(
        backend: &mut SliceWithPos<'a>,
    ) -> deser::Result<Self::DeserType<'a>> {
        let slice = unsafe { deser_eps_slice_zero(backend) }?;
        // SAFETY: Actually this is unsafe if the data we read is not valid UTF-8
        Ok({
            unsafe {
                #[allow(clippy::transmute_bytes_to_str)]
                core::mem::transmute::<&'_ [u8], &'_ str>(slice)
            }
        })
    }
}

unsafe impl CopyType for Box<str> {
    type Copy = Deep;
}

impl TypeHash for Box<str> {
    fn type_hash(hasher: &mut impl core::hash::Hasher) {
        "Box<str>".hash(hasher);
    }
}

impl AlignHash for Box<str> {
    fn align_hash(_hasher: &mut impl core::hash::Hasher, _offset_of: &mut usize) {}
}

impl SerInner for Box<str> {
    type SerType = Self;
    // Box<[$ty]> can, but Vec<Box<[$ty]>> cannot!
    const IS_ZERO_COPY: bool = false;

    unsafe fn _ser_inner(&self, backend: &mut impl WriteWithNames) -> ser::Result<()> {
        ser_slice_zero(backend, self.as_bytes())
    }
}

impl DeserInner for Box<str> {
    check_covariance!();
    #[inline(always)]
    unsafe fn _deser_full_inner(backend: &mut impl ReadWithPos) -> deser::Result<Self> {
        Ok(unsafe { String::_deser_full_inner(backend) }?.into_boxed_str())
    }

    type DeserType<'a> = &'a str;

    #[inline(always)]
    unsafe fn _deser_eps_inner<'a>(
        backend: &mut SliceWithPos<'a>,
    ) -> deser::Result<Self::DeserType<'a>> {
        unsafe { String::_deser_eps_inner(backend) }
    }
}

// For use with PhantomData
impl TypeHash for str {
    fn type_hash(hasher: &mut impl core::hash::Hasher) {
        "str".hash(hasher);
    }
}

impl TypeHash for &str {
    fn type_hash(hasher: &mut impl core::hash::Hasher) {
        "&str".hash(hasher);
    }
}
unsafe impl CopyType for &str {
    type Copy = Deep;
}

impl SerInner for &str {
    type SerType = Box<str>;
    const IS_ZERO_COPY: bool = false;

    unsafe fn _ser_inner(&self, backend: &mut impl WriteWithNames) -> ser::Result<()> {
        ser_slice_zero(backend, self.as_bytes())
    }
}

1	/*
2	* SPDX-FileCopyrightText: 2023 Inria
3	* SPDX-FileCopyrightText: 2023 Sebastiano Vigna
4	*
5	* SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later
6	*/
7
8	//! Implementations for strings.
9	//!
10	//! All string types have the same serialization type, `Box<str>`, and the same
11	//! deserialization type, `&str`. Thus, you can serialize a `String` and fully
12	//! deserialize it as `Box<str>`.
13	//!
14	//! Similarly to the case of [slices](crate::impls::slice), there is
15	//! a convenience [`SerInner`] implementation for `&str` that
16	//! serializes it as `Box<str>`.
17	//!
18	//! We implement [`TypeHash`] for `str` so that it can be used in
19	//! [`PhantomData`](core::marker::PhantomData).
20
21	use crate::{check_covariance, prelude::*};
22	use core::hash::Hash;
23	use deser::*;
24	use ser::*;
25
26	#[cfg(not(feature = "std"))]
27	use alloc::boxed::Box;
28
29	unsafe impl CopyType for String {
30	type Copy = Deep;
31	}
32
33	#[cfg(not(feature = "std"))]
34	use alloc::string::String;
35
36	impl TypeHash for String {
37	fn type_hash(hasher: &mut impl core::hash::Hasher) {	1✔
38	"String".hash(hasher);	3✔
39	}
40	}
41
42	impl SerInner for String {
43	type SerType = Box<str>;
44	const IS_ZERO_COPY: bool = false;
45
46	unsafe fn _ser_inner(&self, backend: &mut impl WriteWithNames) -> ser::Result<()> {	22✔
47	ser_slice_zero(backend, self.as_bytes())	66✔
48	}
49	}
50
51	impl DeserInner for String {
52	check_covariance!();
53	unsafe fn _deser_full_inner(backend: &mut impl ReadWithPos) -> deser::Result<Self> {	900✔
54	let slice = unsafe { deser_full_vec_zero(backend) }?;	2,700✔
55	String::from_utf8(slice).map_err(\|_\| deser::Error::InvalidData)	2,478✔
56	}
57
58	type DeserType<'a> = &'a str;
59
60	unsafe fn _deser_eps_inner<'a>(	32✔
61	backend: &mut SliceWithPos<'a>,
62	) -> deser::Result<Self::DeserType<'a>> {
63	let slice = unsafe { deser_eps_slice_zero(backend) }?;	96✔
64	// SAFETY: Actually this is unsafe if the data we read is not valid UTF-8
65	Ok({	32✔
66	unsafe {	32✔
67	#[allow(clippy::transmute_bytes_to_str)]	32✔
68	core::mem::transmute::<&'_ [u8], &'_ str>(slice)	32✔
69	}
70	})
71	}
72	}
73
74	unsafe impl CopyType for Box<str> {
75	type Copy = Deep;
76	}
77
78	impl TypeHash for Box<str> {
79	fn type_hash(hasher: &mut impl core::hash::Hasher) {	41✔
80	"Box<str>".hash(hasher);	123✔
81	}
82	}
83
84	impl AlignHash for Box<str> {
85	fn align_hash(_hasher: &mut impl core::hash::Hasher, _offset_of: &mut usize) {}	88✔
86	}
87
88	impl SerInner for Box<str> {
89	type SerType = Self;
90	// Box<[$ty]> can, but Vec<Box<[$ty]>> cannot!
91	const IS_ZERO_COPY: bool = false;
92
93	unsafe fn _ser_inner(&self, backend: &mut impl WriteWithNames) -> ser::Result<()> {	2✔
94	ser_slice_zero(backend, self.as_bytes())	6✔
95	}
96	}
97
98	impl DeserInner for Box<str> {
99	check_covariance!();
100	#[inline(always)]
101	unsafe fn _deser_full_inner(backend: &mut impl ReadWithPos) -> deser::Result<Self> {	4✔
102	Ok(unsafe { String::_deser_full_inner(backend) }?.into_boxed_str())	12✔
103	}
104
105	type DeserType<'a> = &'a str;
106
107	#[inline(always)]
108	unsafe fn _deser_eps_inner<'a>(	6✔
109	backend: &mut SliceWithPos<'a>,
110	) -> deser::Result<Self::DeserType<'a>> {
111	unsafe { String::_deser_eps_inner(backend) }	12✔
112	}
113	}
114
115	// For use with PhantomData
116	impl TypeHash for str {
117	fn type_hash(hasher: &mut impl core::hash::Hasher) {	4✔
118	"str".hash(hasher);	12✔
119	}
120	}
121
122	impl TypeHash for &str {
123	fn type_hash(hasher: &mut impl core::hash::Hasher) {	×
124	"&str".hash(hasher);	×
125	}
126	}
127	unsafe impl CopyType for &str {
128	type Copy = Deep;
129	}
130
131	impl SerInner for &str {
132	type SerType = Box<str>;
133	const IS_ZERO_COPY: bool = false;
134
135	unsafe fn _ser_inner(&self, backend: &mut impl WriteWithNames) -> ser::Result<()> {	431✔
136	ser_slice_zero(backend, self.as_bytes())	1,293✔
137	}
138	}

vigna / epserde-rs / 28525681214

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