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Fix arithmetic overflow panics #138

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merged 2 commits into from
Jul 29, 2024
Merged

Fix arithmetic overflow panics #138

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cbb8772
fix: arithmetic overflow
cardigan1008 Jul 28, 2024
164f787
fmt
Manishearth Jul 29, 2024
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14 changes: 8 additions & 6 deletions src/grapheme.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -412,7 +412,7 @@ impl GraphemeCursor {
/// ```
pub fn provide_context(&mut self, chunk: &str, chunk_start: usize) {
use crate::tables::grapheme as gr;
assert!(chunk_start + chunk.len() == self.pre_context_offset.unwrap());
assert!(chunk_start.saturating_add(chunk.len()) == self.pre_context_offset.unwrap());
self.pre_context_offset = None;
if self.is_extended && chunk_start + chunk.len() == self.offset {
let ch = chunk.chars().next_back().unwrap();
Expand Down Expand Up @@ -598,15 +598,15 @@ impl GraphemeCursor {
if self.state == GraphemeState::NotBreak {
return Ok(false);
}
if (self.offset < chunk_start || self.offset >= chunk_start + chunk.len())
&& (self.offset > chunk_start + chunk.len() || self.cat_after.is_none())
if (self.offset < chunk_start || self.offset >= chunk_start.saturating_add(chunk.len()))
&& (self.offset > chunk_start.saturating_add(chunk.len()) || self.cat_after.is_none())
{
return Err(GraphemeIncomplete::InvalidOffset);
}
if let Some(pre_context_offset) = self.pre_context_offset {
return Err(GraphemeIncomplete::PreContext(pre_context_offset));
}
let offset_in_chunk = self.offset - chunk_start;
let offset_in_chunk = self.offset.saturating_sub(chunk_start);
if self.cat_after.is_none() {
let ch = chunk[offset_in_chunk..].chars().next().unwrap();
self.cat_after = Some(self.grapheme_category(ch));
Expand Down Expand Up @@ -702,7 +702,7 @@ impl GraphemeCursor {
self.cat_after = Some(self.grapheme_category(ch));
}
} else {
self.offset += ch.len_utf8();
self.offset = self.offset.saturating_add(ch.len_utf8());
self.state = GraphemeState::Unknown;
self.cat_before = self.cat_after.take();
if self.cat_before.is_none() {
Expand Down Expand Up @@ -781,7 +781,9 @@ impl GraphemeCursor {
if self.offset == chunk_start {
return Err(GraphemeIncomplete::PrevChunk);
}
let mut iter = chunk[..self.offset - chunk_start].chars().rev();
let mut iter = chunk[..self.offset.saturating_sub(chunk_start)]
.chars()
.rev();
let mut ch = iter.next().unwrap();
loop {
if self.offset == chunk_start {
Expand Down
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