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tomsideguide
55 lines
3.8 KiB
Rust
55 lines
3.8 KiB
Rust
#![no_main]
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use libfuzzer_sys::fuzz_target;
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use std::io::{Cursor, Write};
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// A number format code, carried into the engine on a minimal workbook. The
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// grammar is where the parsing complexity lives, and reaching it through a
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// discovered styles part would cost the fuzzer most of its budget. Only the
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// control characters XML forbids are dropped, so whitespace a code may carry
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// still reaches the parser.
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fuzz_target!(|data: &[u8]| {
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let code = String::from_utf8_lossy(data);
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let escaped: String = code
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.chars()
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.filter(|c| !c.is_control() || matches!(c, '\t' | '\n' | '\r'))
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.map(|c| match c {
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'&' => "&".to_string(),
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'<' => "<".to_string(),
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'>' => ">".to_string(),
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'"' => """.to_string(),
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c => c.to_string(),
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})
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.collect();
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let styles = format!(
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r#"<?xml version="1.0"?><styleSheet xmlns="{SML}"><numFmts count="1"><numFmt numFmtId="164" formatCode="{escaped}"/></numFmts><cellXfs count="2"><xf numFmtId="0"/><xf numFmtId="164" applyNumberFormat="1"/></cellXfs></styleSheet>"#
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);
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let mut zip = zip::ZipWriter::new(Cursor::new(Vec::new()));
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let opts = zip::write::SimpleFileOptions::default();
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let parts: [(&str, &str); 6] = [
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("[Content_Types].xml", CONTENT_TYPES),
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("_rels/.rels", RELS),
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("xl/workbook.xml", WORKBOOK),
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("xl/_rels/workbook.xml.rels", WORKBOOK_RELS),
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("xl/styles.xml", &styles),
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("xl/worksheets/sheet1.xml", SHEET),
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];
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for (name, body) in parts {
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if zip.start_file(name, opts).is_err() || zip.write_all(body.as_bytes()).is_err() {
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return;
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}
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}
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let Ok(bytes) = zip.finish() else {
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return;
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};
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let _ = anydoc::to_markdown_bytes(bytes.into_inner().as_slice(), anydoc::Format::Excel);
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});
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const SML: &str = "http://schemas.openxmlformats.org/spreadsheetml/2006/main";
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const CONTENT_TYPES: &str = r#"<?xml version="1.0"?><Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types"><Default Extension="rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/><Default Extension="xml" ContentType="application/xml"/><Override PartName="/xl/workbook.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml"/><Override PartName="/xl/styles.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.styles+xml"/><Override PartName="/xl/worksheets/sheet1.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml"/></Types>"#;
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const RELS: &str = r#"<?xml version="1.0"?><Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships"><Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument" Target="xl/workbook.xml"/></Relationships>"#;
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const WORKBOOK: &str = r#"<?xml version="1.0"?><workbook xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"><sheets><sheet name="S" sheetId="1" r:id="rId1"/></sheets></workbook>"#;
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const WORKBOOK_RELS: &str = r#"<?xml version="1.0"?><Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships"><Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet" Target="worksheets/sheet1.xml"/><Relationship Id="rId2" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles" Target="styles.xml"/></Relationships>"#;
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const SHEET: &str = r#"<?xml version="1.0"?><worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"><sheetData><row r="1"><c r="A1" s="1"><v>1234.5</v></c><c r="B1" s="1"><v>0.075</v></c><c r="C1" s="1" t="inlineStr"><is><t>text</t></is></c></row></sheetData></worksheet>"#;
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