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core: Fix undefined wrapping behavior triggered by Rust nightly (fix #579) #582

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merged 2 commits into from May 13, 2020
Merged

core: Fix undefined wrapping behavior triggered by Rust nightly (fix #579) #582

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378c108
core: Avoid undefined behavior in f64_to_wrapping functions
Herschel May 13, 2020
d387bb8
swf: Avoid undefined behavior in write_fbits
Herschel May 13, 2020
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8 changes: 2 additions & 6 deletions core/src/avm1/value.rs
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Expand Up @@ -623,10 +623,8 @@ pub fn f64_to_string(n: f64) -> String {
pub fn f64_to_wrapping_u16(n: f64) -> u16 {
if !n.is_finite() {
0
} else if n >= 0.0 {
(n % 65536.0) as u16
} else {
((n.trunc() % 65536.0) + 65536.0) as u16
n.trunc().rem_euclid(65536.0) as u16
}
}

Expand All @@ -642,10 +640,8 @@ pub fn f64_to_wrapping_i16(n: f64) -> i16 {
pub fn f64_to_wrapping_u32(n: f64) -> u32 {
if !n.is_finite() {
0
} else if n >= 0.0 {
(n % 4294967296.0) as u32
} else {
((n.trunc() % 4294967296.0) + 4294967296.0) as u32
n.trunc().rem_euclid(4294967296.0) as u32
}
}

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2 changes: 1 addition & 1 deletion swf/src/write.rs
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Expand Up @@ -303,7 +303,7 @@ impl<W: Write> Writer<W> {
}

fn write_fbits(&mut self, num_bits: u8, n: f32) -> Result<()> {
self.write_ubits(num_bits, (n * 65536f32) as u32)
self.write_sbits(num_bits, (n * 65536f32) as i32)
}

fn write_encoded_u32(&mut self, mut n: u32) -> Result<()> {
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