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authordaurnimator <quae@daurnimator.com>2017-11-12 15:31:37 +1100
committerdaurnimator <quae@daurnimator.com>2017-11-12 15:34:23 +1100
commit902d145793959ce0347b202303f8cb34223e6b04 (patch)
tree85d737a13511c01446626fa97cec97ecdfee0503 /src
parentbe782a0b0313d3b23473b6fd08e08ffea20156be (diff)
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src/defs.js: Check for invalid continuation bytes
Diffstat (limited to 'src')
-rw-r--r--src/defs.js6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/defs.js b/src/defs.js
index ad79c67..01a48f5 100644
--- a/src/defs.js
+++ b/src/defs.js
@@ -157,19 +157,25 @@ const to_jsstring = function(value, from, to) {
/* two byte sequence */
if (i >= to) throw RangeError("cannot convert invalid utf8 to javascript string");
let u1 = value[i++];
+ if ((u1&0xC0) !== 0x80) throw RangeError("cannot convert invalid utf8 to javascript string");
u = ((u0 & 0x1F) << 6) + (u1 & 0x3F);
} else if (u0 <= 0xEF) {
/* three byte sequence */
if (i+1 >= to) throw RangeError("cannot convert invalid utf8 to javascript string");
let u1 = value[i++];
+ if ((u1&0xC0) !== 0x80) throw RangeError("cannot convert invalid utf8 to javascript string");
let u2 = value[i++];
+ if ((u2&0xC0) !== 0x80) throw RangeError("cannot convert invalid utf8 to javascript string");
u = ((u0 & 0x0F) << 12) + ((u1 & 0x3F) << 6) + (u2 & 0x3F);
} else {
/* four byte sequence */
if (i+2 >= to) throw RangeError("cannot convert invalid utf8 to javascript string");
let u1 = value[i++];
+ if ((u1&0xC0) !== 0x80) throw RangeError("cannot convert invalid utf8 to javascript string");
let u2 = value[i++];
+ if ((u2&0xC0) !== 0x80) throw RangeError("cannot convert invalid utf8 to javascript string");
let u3 = value[i++];
+ if ((u3&0xC0) !== 0x80) throw RangeError("cannot convert invalid utf8 to javascript string");
u = ((u0 & 0x07) << 18) + ((u1 & 0x3F) << 12) + ((u2 & 0x3F) << 6) + (u3 & 0x3F);
}
str += String.fromCodePoint(u);