[librsvg/librsvg-2.48] Use the cast crate for checked casts from f64 to i32



commit f7e2871c2c5b3d231f1036bc9ebfb1c1160a3fa5
Author: Federico Mena Quintero <federico gnome org>
Date:   Fri Apr 24 20:47:02 2020 -0500

    Use the cast crate for checked casts from f64 to i32
    
    We turn out-of-range values into cairo::Status::InvalidSize, which is
    what one would get for too-big surfaces, anyway.

 Cargo.lock         | 1131 ++++++++++++++++++++++++++--------------------------
 librsvg/Cargo.toml |    1 +
 librsvg/c_api.rs   |   23 +-
 3 files changed, 583 insertions(+), 572 deletions(-)
---
diff --git a/Cargo.lock b/Cargo.lock
index 54361937..aef07d58 100644
--- a/Cargo.lock
+++ b/Cargo.lock
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-"checksum rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = 
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-"checksum ryu 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = 
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-"checksum scopeguard 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = 
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-"checksum selectors 0.22.0 (registry+https://github.com/rust-lang/crates.io-index)" = 
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-"checksum semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = 
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-"checksum semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = 
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-"checksum serde 1.0.106 (registry+https://github.com/rust-lang/crates.io-index)" = 
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-"checksum serde_derive 1.0.106 (registry+https://github.com/rust-lang/crates.io-index)" = 
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-"checksum serde_json 1.0.51 (registry+https://github.com/rust-lang/crates.io-index)" = 
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-"checksum servo_arc 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = 
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-"checksum siphasher 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = 
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-"checksum slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = 
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-"checksum smallvec 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = 
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-"checksum utf-8 0.7.5 (registry+https://github.com/rust-lang/crates.io-index)" = 
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-"checksum walkdir 2.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = 
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-"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = 
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-"checksum xml5ever 0.16.1 (registry+https://github.com/rust-lang/crates.io-index)" = 
"0b1b52e6e8614d4a58b8e70cf51ec0cc21b256ad8206708bcff8139b5bbd6a59"
+ "log",
+ "mac",
+ "markup5ever",
+ "time",
+]
diff --git a/librsvg/Cargo.toml b/librsvg/Cargo.toml
index 0fed1a98..42a0936d 100644
--- a/librsvg/Cargo.toml
+++ b/librsvg/Cargo.toml
@@ -14,6 +14,7 @@ crate-type = [ "staticlib" ]
 bitflags = "1.0"
 cairo-rs = { version="0.8.0", features=["v1_16"] }
 cairo-sys-rs = "0.9.0"
+cast = "0.2.3"
 gdk-pixbuf = "0.8.0"
 gdk-pixbuf-sys = "0.9.0"
 glib = "0.9.0"
diff --git a/librsvg/c_api.rs b/librsvg/c_api.rs
index 0061925d..23d4bda6 100644
--- a/librsvg/c_api.rs
+++ b/librsvg/c_api.rs
@@ -8,6 +8,7 @@ use std::str;
 use std::sync::Once;
 use std::{f64, i32};
 
+use cast;
 use gdk_pixbuf::Pixbuf;
 use glib::error::ErrorDomain;
 use url::Url;
@@ -464,6 +465,10 @@ impl ObjectImpl for CHandle {
     }
 }
 
+fn checked_i32(x: f64) -> Result<i32, cairo::Status> {
+    cast::i32(x).map_err(|_| cairo::Status::InvalidSize)
+}
+
 impl CHandle {
     fn set_base_url(&self, url: &str) {
         let state = self.load_state.borrow();
@@ -701,9 +706,12 @@ impl CHandle {
         let res = handle
             .get_geometry_sub(id, inner.dpi, inner.is_testing)
             .and_then(|(ink_r, _)| {
-                let width = ink_r.width().round() as libc::c_int;
-                let height = ink_r.height().round() as libc::c_int;
+                let width = checked_i32(ink_r.width().round())?;
+                let height = checked_i32(ink_r.height().round())?;
 
+                Ok((ink_r, width, height))
+            })
+            .and_then(|(ink_r, width, height)| {
                 let (w, h) = inner.size_callback.call(width, height);
 
                 Ok(RsvgDimensionData {
@@ -730,14 +738,17 @@ impl CHandle {
         handle
             .get_geometry_sub(id, inner.dpi, inner.is_testing)
             .and_then(|(ink_r, _)| {
-                let width = ink_r.width().round() as libc::c_int;
-                let height = ink_r.height().round() as libc::c_int;
+                let width = checked_i32(ink_r.width().round())?;
+                let height = checked_i32(ink_r.height().round())?;
 
+                Ok((ink_r, width, height))
+            })
+            .and_then(|(ink_r, width, height)| {
                 inner.size_callback.call(width, height);
 
                 Ok(RsvgPositionData {
-                    x: ink_r.x0 as libc::c_int,
-                    y: ink_r.y0 as libc::c_int,
+                    x: checked_i32(ink_r.x0)?,
+                    y: checked_i32(ink_r.y0)?,
                 })
             })
             .map_err(warn_on_invalid_id)


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