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Diffstat (limited to 'vendor/content_inspector')
18 files changed, 646 insertions, 0 deletions
diff --git a/vendor/content_inspector/.cargo-checksum.json b/vendor/content_inspector/.cargo-checksum.json new file mode 100644 index 0000000..fe43d36 --- /dev/null +++ b/vendor/content_inspector/.cargo-checksum.json @@ -0,0 +1 @@ +{"files":{},"package":"b7bda66e858c683005a53a9a60c69a4aca7eeaa45d124526e389f7aec8e62f38"}
\ No newline at end of file diff --git a/vendor/content_inspector/Cargo.toml b/vendor/content_inspector/Cargo.toml new file mode 100644 index 0000000..cf50d71 --- /dev/null +++ b/vendor/content_inspector/Cargo.toml @@ -0,0 +1,25 @@ +# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO +# +# When uploading crates to the registry Cargo will automatically +# "normalize" Cargo.toml files for maximal compatibility +# with all versions of Cargo and also rewrite `path` dependencies +# to registry (e.g. crates.io) dependencies +# +# If you believe there's an error in this file please file an +# issue against the rust-lang/cargo repository. If you're +# editing this file be aware that the upstream Cargo.toml +# will likely look very different (and much more reasonable) + +[package] +name = "content_inspector" +version = "0.2.4" +authors = ["David Peter <mail@david-peter.de>"] +description = "Fast inspection of binary buffers to guess/determine the encoding" +homepage = "https://github.com/sharkdp/content_inspector" +readme = "README.md" +keywords = ["unicode", "encoding", "binary", "text", "library"] +categories = ["encoding"] +license = "MIT/Apache-2.0" +repository = "https://github.com/sharkdp/content_inspector" +[dependencies.memchr] +version = "2" diff --git a/vendor/content_inspector/LICENSE-APACHE b/vendor/content_inspector/LICENSE-APACHE new file mode 100644 index 0000000..261eeb9 --- /dev/null +++ b/vendor/content_inspector/LICENSE-APACHE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/vendor/content_inspector/README.md b/vendor/content_inspector/README.md new file mode 100644 index 0000000..f1e2dc1 --- /dev/null +++ b/vendor/content_inspector/README.md @@ -0,0 +1,65 @@ +# content_inspector + +[](https://crates.io/crates/content_inspector) +[](https://docs.rs/content_inspector) + +A simple library for *fast* inspection of binary buffers to guess the type of content. + +This is mainly intended to quickly determine whether a given buffer contains "binary" +or "text" data. Programs like `grep` or `git diff` use similar mechanisms to decide whether +to treat some files as "binary data" or not. + +The analysis is based on a very simple heuristic: Searching for NULL bytes +(indicating "binary" content) and the detection of special [byte order +marks](https://en.wikipedia.org/wiki/Byte_order_mark) (indicating a particular kind of textual +encoding). Note that **this analysis can fail**. For example, even if unlikely, UTF-8-encoded +text can legally contain NULL bytes. Conversely, some particular binary formats (like binary +[PGM](https://en.wikipedia.org/wiki/Netpbm_format)) may not contain NULL bytes. Also, for +performance reasons, only the first 1024 bytes are checked for the NULL-byte (if no BOM was +detected). + +If this library reports a certain type of encoding (say `UTF_16LE`), there is **no guarantee** that +the binary buffer can actually be decoded as UTF-16LE. + +## Usage + +```rust +use content_inspector::{ContentType, inspect}; + +assert_eq!(ContentType::UTF_8, inspect(b"Hello")); +assert_eq!(ContentType::BINARY, inspect(b"\xFF\xE0\x00\x10\x4A\x46\x49\x46\x00")); + +assert!(inspect(b"Hello").is_text()); +``` + +## CLI example + +This crate also comes with a small example command-line program (see [`examples/inspect.rs`](examples/inspect.rs)) that demonstrates the usage: +```bash +> inspect +USAGE: inspect FILE [FILE...] + +> inspect testdata/* +testdata/create_text_files.py: UTF-8 +testdata/file_sources.md: UTF-8 +testdata/test.jpg: binary +testdata/test.pdf: binary +testdata/test.png: binary +testdata/text_UTF-16BE-BOM.txt: UTF-16BE +testdata/text_UTF-16LE-BOM.txt: UTF-16LE +testdata/text_UTF-32BE-BOM.txt: UTF-32BE +testdata/text_UTF-32LE-BOM.txt: UTF-32LE +testdata/text_UTF-8-BOM.txt: UTF-8-BOM +testdata/text_UTF-8.txt: UTF-8 +``` + +If you only want to detect whether something is a binary or text file, this is about a factor of 250 faster than `file --mime ...`. + +## License + +Licensed under either of + + * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0) + * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT) + +at your option. diff --git a/vendor/content_inspector/examples/inspect.rs b/vendor/content_inspector/examples/inspect.rs new file mode 100644 index 0000000..5103d46 --- /dev/null +++ b/vendor/content_inspector/examples/inspect.rs @@ -0,0 +1,36 @@ +extern crate content_inspector; + +use std::env; +use std::fs::File; +use std::io::{Error, Read}; +use std::path::Path; +use std::process::exit; + +const MAX_PEEK_SIZE: usize = 1024; + +fn main() -> Result<(), Error> { + let mut args = env::args(); + + if args.len() < 2 { + eprintln!("USAGE: inspect FILE [FILE...]"); + exit(1); + } + + args.next(); + + for filename in args { + if !Path::new(&filename).is_file() { + continue; + } + + let file = File::open(&filename)?; + let mut buffer: Vec<u8> = vec![]; + + file.take(MAX_PEEK_SIZE as u64).read_to_end(&mut buffer)?; + + let content_type = content_inspector::inspect(&buffer); + println!("{}: {}", filename, content_type); + } + + Ok(()) +} diff --git a/vendor/content_inspector/src/lib.rs b/vendor/content_inspector/src/lib.rs new file mode 100644 index 0000000..de846cc --- /dev/null +++ b/vendor/content_inspector/src/lib.rs @@ -0,0 +1,218 @@ +//! A simple library for *fast* inspection of binary buffers to guess the type of content. +//! +//! This is mainly intended to quickly determine whether a given buffer contains "binary" +//! or "text" data. Programs like `grep` or `git diff` use similar mechanisms to decide whether +//! to treat some files as "binary data" or not. +//! +//! The analysis is based on a very simple heuristic: Searching for NULL bytes +//! (indicating "binary" content) and the detection of special [byte order +//! marks](https://en.wikipedia.org/wiki/Byte_order_mark) (indicating a particular kind of textual +//! encoding). Note that **this analysis can fail**. For example, even if unlikely, UTF-8-encoded +//! text can legally contain NULL bytes. Conversely, some particular binary formats (like binary +//! [PGM](https://en.wikipedia.org/wiki/Netpbm_format)) may not contain NULL bytes. Also, for +//! performance reasons, only the first 1024 bytes are checked for the NULL-byte (if no BOM was +//! detected). +//! +//! If this library reports a certain type of encoding (say `UTF_16LE`), there is **no guarantee** +//! that the binary buffer can *actually* be decoded as UTF-16LE. +//! +//! # Example +//! ``` +//! use content_inspector::{ContentType, inspect}; +//! +//! assert_eq!(ContentType::UTF_8, inspect(b"Hello")); +//! assert_eq!(ContentType::BINARY, inspect(b"\xFF\xE0\x00\x10\x4A\x46\x49\x46\x00")); +//! +//! assert!(inspect(b"Hello").is_text()); +//! ``` + +extern crate memchr; + +use memchr::memchr; +use std::cmp::min; +use std::fmt; + +const MAX_SCAN_SIZE: usize = 1024; + +/// The type of encoding that was detected (for "text" data) or `BINARY` for "binary" data. +#[allow(non_camel_case_types)] +#[derive(Copy, Clone, Debug, PartialEq)] +pub enum ContentType { + /// "binary" data + BINARY, + + /// UTF-8 encoded "text" data + UTF_8, + + /// UTF-8 encoded "text" data with a byte order mark. + UTF_8_BOM, + + /// UTF-16 encoded "text" data (little endian) + UTF_16LE, + + /// UTF-16 encoded "text" data (big endian) + UTF_16BE, + + /// UTF-32 encoded "text" data (little endian) + UTF_32LE, + + /// UTF-32 encoded "text" data (big endian) + UTF_32BE, +} + +impl ContentType { + /// Returns `true`, if the `ContentType` is `BINARY`. + pub fn is_binary(self) -> bool { + self == ContentType::BINARY + } + + /// Returns `true`, if the `ContentType` is __not__ `BINARY`. + pub fn is_text(self) -> bool { + !self.is_binary() + } +} + +impl fmt::Display for ContentType { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + use ContentType::*; + + let name: &str = match *self { + BINARY => "binary", + UTF_8 => "UTF-8", + UTF_8_BOM => "UTF-8-BOM", + UTF_16LE => "UTF-16LE", + UTF_16BE => "UTF-16BE", + UTF_32LE => "UTF-32LE", + UTF_32BE => "UTF-32BE", + }; + write!(f, "{}", name) + } +} + +/// Common byte order marks +/// (see https://en.wikipedia.org/wiki/Byte_order_mark) +static BYTE_ORDER_MARKS: &[(&[u8], ContentType)] = &[ + (&[0xEF, 0xBB, 0xBF], ContentType::UTF_8_BOM), + // UTF-32 needs to be checked before UTF-16 (overlapping BOMs) + (&[0x00, 0x00, 0xFE, 0xFF], ContentType::UTF_32BE), + (&[0xFF, 0xFE, 0x00, 0x00], ContentType::UTF_32LE), + (&[0xFE, 0xFF], ContentType::UTF_16BE), + (&[0xFF, 0xFE], ContentType::UTF_16LE), +]; + +/// Magic numbers for some filetypes that could otherwise be characterized as text. +static MAGIC_NUMBERS: [&[u8]; 2] = [b"%PDF", b"\x89PNG"]; + +/// Try to determine the type of content in the given buffer. See the crate documentation for a +/// usage example and for more details on how this analysis is performed. +/// +/// If the buffer is empty, the content type will be reported as `UTF_8`. +pub fn inspect(buffer: &[u8]) -> ContentType { + use ContentType::*; + + for &(bom, content_type) in BYTE_ORDER_MARKS { + if buffer.starts_with(bom) { + return content_type; + } + } + + // Scan the first few bytes for zero-bytes + let scan_size = min(buffer.len(), MAX_SCAN_SIZE); + let has_zero_bytes = memchr(0x00, &buffer[..scan_size]).is_some(); + + if has_zero_bytes { + return BINARY; + } + + if MAGIC_NUMBERS.iter().any(|magic| buffer.starts_with(magic)) { + return BINARY; + } + + UTF_8 +} + +#[cfg(test)] +mod tests { + use {inspect, ContentType::*}; + + #[test] + fn test_empty_buffer_utf_8() { + assert_eq!(UTF_8, inspect(b"")); + } + + #[test] + fn test_text_simple() { + assert_eq!(UTF_8, inspect("Simple UTF-8 string ☔".as_bytes())); + } + + #[test] + fn test_text_utf8() { + assert_eq!(UTF_8, inspect(include_bytes!("../testdata/text_UTF-8.txt"))); + } + + #[test] + fn test_text_utf8_bom() { + assert_eq!( + UTF_8_BOM, + inspect(include_bytes!("../testdata/text_UTF-8-BOM.txt")) + ); + } + + #[test] + fn test_text_utf16le() { + assert_eq!( + UTF_16LE, + inspect(include_bytes!("../testdata/text_UTF-16LE-BOM.txt")) + ); + } + + #[test] + fn test_text_utf16be() { + assert_eq!( + UTF_16BE, + inspect(include_bytes!("../testdata/text_UTF-16BE-BOM.txt")) + ); + } + + #[test] + fn test_text_utf32le() { + assert_eq!( + UTF_32LE, + inspect(include_bytes!("../testdata/text_UTF-32LE-BOM.txt")) + ); + } + + #[test] + fn test_text_utf32be() { + assert_eq!( + UTF_32BE, + inspect(include_bytes!("../testdata/text_UTF-32BE-BOM.txt")) + ); + } + + #[test] + fn test_png() { + assert_eq!(BINARY, inspect(include_bytes!("../testdata/test.png"))); + } + + #[test] + fn test_jpg() { + assert_eq!(BINARY, inspect(include_bytes!("../testdata/test.jpg"))); + } + + #[test] + fn test_pdf() { + assert_eq!(BINARY, inspect(include_bytes!("../testdata/test.pdf"))); + } + + #[test] + fn test_is_text() { + assert!(UTF_8.is_text()); + assert!(UTF_32LE.is_text()); + } + + #[test] + fn test_is_binary() { + assert!(BINARY.is_binary()); + } +} diff --git a/vendor/content_inspector/testdata/create_text_files.py b/vendor/content_inspector/testdata/create_text_files.py new file mode 100644 index 0000000..e1cd477 --- /dev/null +++ b/vendor/content_inspector/testdata/create_text_files.py @@ -0,0 +1,18 @@ +import codecs + +encodings = { + "UTF-8": ("utf-8", codecs.BOM_UTF8), + "UTF-16BE": ("utf_16_be", codecs.BOM_UTF16_BE), + "UTF-16LE": ("utf_16_le", codecs.BOM_UTF16_LE), + "UTF-32BE": ("utf_32_be", codecs.BOM_UTF32_BE), + "UTF-32LE": ("utf_32_le", codecs.BOM_UTF32_LE), +} + +with open("text_UTF-8.txt", "rb") as source: + data = source.read() + text = data.decode("utf-8") + + for name, (encoding, bom) in encodings.items(): + with open("text_{}-BOM.txt".format(name), "wb") as target: + target.write(bom) + target.write(text.encode(encoding)) diff --git a/vendor/content_inspector/testdata/file_sources.md b/vendor/content_inspector/testdata/file_sources.md new file mode 100644 index 0000000..e015564 --- /dev/null +++ b/vendor/content_inspector/testdata/file_sources.md @@ -0,0 +1,3 @@ +test.png: https://commons.wikimedia.org/wiki/File:PNG-Gradient.png +test.jpg: https://commons.wikimedia.org/wiki/File:JPEG_example_JPG_RIP_001.jpg +test.pdf: http://brendanzagaeski.appspot.com/0004.html diff --git a/vendor/content_inspector/testdata/test.jpg b/vendor/content_inspector/testdata/test.jpg Binary files differnew file mode 100644 index 0000000..0655464 --- /dev/null +++ b/vendor/content_inspector/testdata/test.jpg diff --git a/vendor/content_inspector/testdata/test.pdf b/vendor/content_inspector/testdata/test.pdf new file mode 100644 index 0000000..1c64181 --- /dev/null +++ b/vendor/content_inspector/testdata/test.pdf @@ -0,0 +1,58 @@ +%PDF-1.1 +%¥±ë + +1 0 obj + << /Type /Catalog + /Pages 2 0 R + >> +endobj + +2 0 obj + << /Type /Pages + /Kids [3 0 R] + /Count 1 + /MediaBox [0 0 300 144] + >> +endobj + +3 0 obj + << /Type /Page + /Parent 2 0 R + /Resources + << /Font + << /F1 + << /Type /Font + /Subtype /Type1 + /BaseFont /Times-Roman + >> + >> + >> + /Contents 4 0 R + >> +endobj + +4 0 obj + << /Length 55 >> +stream + BT + /F1 18 Tf + 0 0 Td + (Hello World) Tj + ET +endstream +endobj + +xref +0 5 +0000000000 65535 f +0000000018 00000 n +0000000077 00000 n +0000000178 00000 n +0000000457 00000 n +trailer + << /Root 1 0 R + /Size 5 + >> +startxref +565 +%%EOF diff --git a/vendor/content_inspector/testdata/test.png b/vendor/content_inspector/testdata/test.png Binary files differnew file mode 100644 index 0000000..b0e0aba --- /dev/null +++ b/vendor/content_inspector/testdata/test.png diff --git a/vendor/content_inspector/testdata/text_UTF-16BE-BOM.txt b/vendor/content_inspector/testdata/text_UTF-16BE-BOM.txt Binary files differnew file mode 100644 index 0000000..2965321 --- /dev/null +++ b/vendor/content_inspector/testdata/text_UTF-16BE-BOM.txt diff --git a/vendor/content_inspector/testdata/text_UTF-16LE-BOM.txt b/vendor/content_inspector/testdata/text_UTF-16LE-BOM.txt Binary files differnew file mode 100644 index 0000000..fe3e8b9 --- /dev/null +++ b/vendor/content_inspector/testdata/text_UTF-16LE-BOM.txt diff --git a/vendor/content_inspector/testdata/text_UTF-32BE-BOM.txt b/vendor/content_inspector/testdata/text_UTF-32BE-BOM.txt Binary files differnew file mode 100644 index 0000000..3360d41 --- /dev/null +++ b/vendor/content_inspector/testdata/text_UTF-32BE-BOM.txt diff --git a/vendor/content_inspector/testdata/text_UTF-32LE-BOM.txt b/vendor/content_inspector/testdata/text_UTF-32LE-BOM.txt Binary files differnew file mode 100644 index 0000000..4db0501 --- /dev/null +++ b/vendor/content_inspector/testdata/text_UTF-32LE-BOM.txt diff --git a/vendor/content_inspector/testdata/text_UTF-8-BOM.txt b/vendor/content_inspector/testdata/text_UTF-8-BOM.txt new file mode 100644 index 0000000..64a7a02 --- /dev/null +++ b/vendor/content_inspector/testdata/text_UTF-8-BOM.txt @@ -0,0 +1,2 @@ +simple text and +some characters like 🌂, 💖, ä, 𝄞, € and ∰ diff --git a/vendor/content_inspector/testdata/text_UTF-8.txt b/vendor/content_inspector/testdata/text_UTF-8.txt new file mode 100644 index 0000000..26168a3 --- /dev/null +++ b/vendor/content_inspector/testdata/text_UTF-8.txt @@ -0,0 +1,2 @@ +simple text and +some characters like 🌂, 💖, ä, 𝄞, € and ∰ |
