Adds fuzzing to Oxigraph parsers

fuzz/.gitignore

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+target
+corpus
+artifacts

fuzz/Cargo.toml

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+[package]
+name = "oxigraph-fuzz"
+version = "0.0.0"
+authors = ["Automatically generated"]
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+spargebra = { path = "../lib/spargebra", features = ["rdf-star"] }
+sparesults = { path = "../lib/sparesults", features = ["rdf-star"] }
+
+[workspace]
+
+[[bin]]
+name = "sparql_query"
+path = "fuzz_targets/sparql_query.rs"
+
+[[bin]]
+name = "sparql_update"
+path = "fuzz_targets/sparql_update.rs"
+
+[[bin]]
+name = "sparql_results_json"
+path = "fuzz_targets/sparql_results_json.rs"
+
+[[bin]]
+name = "sparql_results_xml"
+path = "fuzz_targets/sparql_results_xml.rs"
+
+[[bin]]
+name = "sparql_results_tsv"
+path = "fuzz_targets/sparql_results_tsv.rs"

fuzz/fuzz_targets/sparql_query.rs

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+#![no_main]
+use libfuzzer_sys::fuzz_target;
+use spargebra::Query;
+use std::str;
+
+fuzz_target!(|data: &[u8]| {
+    if let Ok(data) = str::from_utf8(data) {
+        Query::parse(data, None);
+    }
+});

fuzz/fuzz_targets/sparql_results_json.rs

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+#![no_main]
+use libfuzzer_sys::fuzz_target;
+use sparesults::{QueryResultsFormat, QueryResultsParser, QueryResultsReader};
+
+fuzz_target!(|data: &[u8]| {
+    let parser = QueryResultsParser::from_format(QueryResultsFormat::Json);
+    if let Ok(QueryResultsReader::Solutions(solutions)) = parser.read_results(data) {
+        for s in solutions {
+            if s.is_err() {
+                // TODO: avoid infinite loop of errors
+                break;
+            }
+        }
+    }
+});

fuzz/fuzz_targets/sparql_results_tsv.rs

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+#![no_main]
+use libfuzzer_sys::fuzz_target;
+use sparesults::{QueryResultsFormat, QueryResultsParser, QueryResultsReader};
+
+fuzz_target!(|data: &[u8]| {
+    let parser = QueryResultsParser::from_format(QueryResultsFormat::Tsv);
+    if let Ok(QueryResultsReader::Solutions(solutions)) = parser.read_results(data) {
+        for _ in solutions {}
+    }
+});

fuzz/fuzz_targets/sparql_results_xml.rs

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+#![no_main]
+use libfuzzer_sys::fuzz_target;
+use sparesults::{QueryResultsFormat, QueryResultsParser, QueryResultsReader};
+
+fuzz_target!(|data: &[u8]| {
+    let parser = QueryResultsParser::from_format(QueryResultsFormat::Xml);
+    if let Ok(QueryResultsReader::Solutions(solutions)) = parser.read_results(data) {
+        for _ in solutions {}
+    }
+});

fuzz/fuzz_targets/sparql_update.rs

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+#![no_main]
+use libfuzzer_sys::fuzz_target;
+use spargebra::Update;
+use std::str;
+
+fuzz_target!(|data: &[u8]| {
+    if let Ok(data) = str::from_utf8(data) {
+        Update::parse(data, None);
+    }
+});