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Fix sign-only integer unpacking #322

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Merged
dduan merged 1 commit into from
Jul 9, 2026
Merged

Fix sign-only integer unpacking #322

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3 changes: 3 additions & 0 deletions Sources/TOMLDecoder/Parsing/Parser.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -1308,6 +1308,9 @@ extension Token {
resultCodeUnits.append(bytes[index])
index = text.index(after: index)
}
guard index < text.upperBound else {
throw TOMLError(.invalidInteger(context: context, lineNumber: lineNumber, reason: "expected digit after sign"))
}

if bytes[index] == CodeUnits.underscore {
throw TOMLError(.invalidInteger(context: context, lineNumber: lineNumber, reason: "cannot start with a '_'"))
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7 changes: 7 additions & 0 deletions Tests/TOMLDecoderTests/TOMLTableKeyMembershipTests.swift
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Expand Up @@ -45,4 +45,11 @@ struct TOMLTableKeyMembershipTests {
try inlineTable.string(forKey: "x")
}
}

@Test
func signOnlyIntegerThrowsWithoutTrapping() throws {
#expect(throws: TOMLError.self) {
_ = try Dictionary(TOMLTable(source: "x = +\n"))
}
}
}
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