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Improve and fix utf-8 encoding / decoding for module #1345

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merged 2 commits into from
Jun 16, 2020
Merged

Improve and fix utf-8 encoding / decoding for module #1345

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8af5bf9
improve utf-8 encoding / decoding
MaxGraey Jun 16, 2020
24bf54b
use assert(false, ..)
MaxGraey Jun 16, 2020
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44 changes: 10 additions & 34 deletions src/module.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -2311,25 +2311,21 @@ function stringLengthUTF8(str: string): usize {
u = 0x10000 + ((u & 0x3FF) << 10) | (str.charCodeAt(++i) & 0x3FF);
}
if (u <= 0x7F) {
++len;
len += 1;
} else if (u <= 0x7FF) {
len += 2;
} else if (u <= 0xFFFF) {
len += 3;
} else if (u <= 0x1FFFFF) {
len += 4;
} else if (u <= 0x3FFFFFF) {
len += 5;
} else {
len += 6;
}
}
return len;
}

function allocString(str: string | null): usize {
if (str === null) return 0;
var ptr = binaryen._malloc(stringLengthUTF8(str) + 1);
var ptr = binaryen._malloc(stringLengthUTF8(str) + 1) >>> 0;
// the following is based on Emscripten's stringToUTF8Array
var idx = ptr;
for (let i = 0, k = str.length; i < k; ++i) {
Expand All @@ -2346,21 +2342,9 @@ function allocString(str: string | null): usize {
binaryen.__i32_store8(idx++, (0xE0 | (u >>> 12) ) as u8);
binaryen.__i32_store8(idx++, (0x80 | ((u >>> 6) & 63)) as u8);
binaryen.__i32_store8(idx++, (0x80 | ( u & 63)) as u8);
} else if (u <= 0x1FFFFF) {
binaryen.__i32_store8(idx++, (0xF0 | (u >>> 18) ) as u8);
binaryen.__i32_store8(idx++, (0x80 | ((u >>> 12) & 63)) as u8);
binaryen.__i32_store8(idx++, (0x80 | ((u >>> 6) & 63)) as u8);
binaryen.__i32_store8(idx++, (0x80 | ( u & 63)) as u8);
} else if (u <= 0x3FFFFFF) {
binaryen.__i32_store8(idx++, (0xF8 | (u >>> 24) ) as u8);
binaryen.__i32_store8(idx++, (0x80 | ((u >>> 18) & 63)) as u8);
binaryen.__i32_store8(idx++, (0x80 | ((u >>> 12) & 63)) as u8);
binaryen.__i32_store8(idx++, (0x80 | ((u >>> 6) & 63)) as u8);
binaryen.__i32_store8(idx++, (0x80 | ( u & 63)) as u8);
} else {
binaryen.__i32_store8(idx++, (0xFC | (u >>> 30) ) as u8);
binaryen.__i32_store8(idx++, (0x80 | ((u >>> 24) & 63)) as u8);
binaryen.__i32_store8(idx++, (0x80 | ((u >>> 18) & 63)) as u8);
assert(u < 0x200000, "Invalid Unicode code point during allocString");
binaryen.__i32_store8(idx++, (0xF0 | (u >>> 18) ) as u8);
binaryen.__i32_store8(idx++, (0x80 | ((u >>> 12) & 63)) as u8);
binaryen.__i32_store8(idx++, (0x80 | ((u >>> 6) & 63)) as u8);
binaryen.__i32_store8(idx++, (0x80 | ( u & 63)) as u8);
Expand All @@ -2370,9 +2354,9 @@ function allocString(str: string | null): usize {
return ptr;
}

function readBuffer(ptr: usize, length: i32): Uint8Array {
var ret = new Uint8Array(length);
for (let i = 0; i < length; ++i) {
function readBuffer(ptr: usize, len: i32): Uint8Array {
var ret = new Uint8Array(len);
for (let i = 0; i < len; ++i) {
ret[i] = binaryen.__i32_load8_u(ptr + <usize>i);
}
return ret;
Expand All @@ -2383,7 +2367,7 @@ export function readString(ptr: usize): string | null {
var arr = new Array<i32>();
// the following is based on Emscripten's UTF8ArrayToString
var cp: u32;
var u1: u32, u2: u32, u3: u32, u4: u32, u5: u32;
var u1: u32, u2: u32, u3: u32;
while (cp = binaryen.__i32_load8_u(ptr++)) {
if (!(cp & 0x80)) {
arr.push(cp);
Expand All @@ -2402,26 +2386,18 @@ export function readString(ptr: usize): string | null {
if ((cp & 0xF8) == 0xF0) {
cp = ((cp & 7) << 18) | (u1 << 12) | (u2 << 6) | u3;
} else {
u4 = binaryen.__i32_load8_u(ptr++) & 63;
if ((cp & 0xFC) == 0xF8) {
cp = ((cp & 3) << 24) | (u1 << 18) | (u2 << 12) | (u3 << 6) | u4;
} else {
u5 = binaryen.__i32_load8_u(ptr++) & 63;
cp = ((cp & 1) << 30) | (u1 << 24) | (u2 << 18) | (u3 << 12) | (u4 << 6) | u5;
}
assert(false, "Invalid UTF8 sequence during readString");
}
}
arr.push(cp);
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if (cp < 0x10000) {
arr.push(cp);
} else {
let ch = cp - 0x10000;
arr.push(0xD800 | (ch >> 10));
arr.push(0xD800 | (ch >>> 10));
arr.push(0xDC00 | (ch & 0x3FF));
}
}
return String.fromCharCodes(arr);
// return String.fromCodePoints(arr);
}

/** Result structure of {@link Module#toBinary}. */
Expand Down