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Initialize charset to safe default

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Fixes a WPT crash (not sure which, but in `/fetch/content-type/`)
This commit is contained in:
Karl Seguin
2026-02-28 10:32:00 +08:00
parent 516bd98198
commit 1473e58a41
1 changed files with 11 additions and 4 deletions
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15
src/browser/Mime.zig
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@@ -24,10 +24,11 @@ params: []const u8 = "",
// IANA defines max. charset value length as 40.
// We keep 41 for null-termination since HTML parser expects in this format.
charset: [41]u8 = default_charset,
charset_len: usize = 5,
charset_len: usize = default_charset_len,
/// String "UTF-8" continued by null characters.
pub const default_charset = .{ 'U', 'T', 'F', '-', '8' } ++ .{0} ** 36;
const default_charset = .{ 'U', 'T', 'F', '-', '8' } ++ .{0} ** 36;
const default_charset_len = 5;
/// Mime with unknown Content-Type, empty params and empty charset.
pub const unknown = Mime{ .content_type = .{ .unknown = {} } };
@@ -127,8 +128,8 @@ pub fn parse(input: []u8) !Mime {
const params = trimLeft(normalized[type_len..]);
var charset: [41]u8 = undefined;
var charset_len: usize = undefined;
var charset: [41]u8 = default_charset;
var charset_len: usize = default_charset_len;
var it = std.mem.splitScalar(u8, params, ';');
while (it.next()) |attr| {
@@ -435,6 +436,12 @@ test "Mime: parse charset" {
.charset = "custom-non-standard-charset-value",
.params = "charset=\"custom-non-standard-charset-value\"",
}, "text/xml;charset=\"custom-non-standard-charset-value\"");
try expect(.{
.content_type = .{ .text_html = {} },
.charset = "UTF-8",
.params = "x=\"",
}, "text/html;x=\"");
}
test "Mime: isHTML" {