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[PoC] Parse integer data #32

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c12cd3e
Handle `Int` nodes.
arthurschreiber Jan 4, 2020
4407172
Remove unused import.
arthurschreiber Jan 7, 2020
f41d63a
Implement missing methods.
arthurschreiber Jan 7, 2020
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Implement missing methods.
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@arthurschreiber
arthurschreiber committed Jan 7, 2020
commit f41d63ad9b47c27e3004a65ca144872c92882c2b
188 changes: 174 additions & 14 deletions src/implementation/js/node/int.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -18,27 +18,51 @@ export class Int extends Node<frontend.node.Int> {

case 2: {
if (this.ref.littleEndian) {
this.readUInt16LE(out);
if (this.ref.signed) {
this.readInt16LE(out);
} else {
this.readUInt16LE(out);
}
} else {
this.readUInt16BE(out);
if (this.ref.signed) {
this.readInt16BE(out);
} else {
this.readUInt16BE(out);
}
}
break;
}

case 3: {
if (this.ref.littleEndian) {
this.readUInt24LE(out);
if (this.ref.signed) {
this.readInt24LE(out);
} else {
this.readUInt24LE(out);
}
} else {
this.readUInt24BE(out);
if (this.ref.signed) {
this.readInt24BE(out);
} else {
this.readUInt24BE(out);
}
}
break;
}

case 4: {
if (this.ref.littleEndian) {
this.readUInt32LE(out);
if (this.ref.signed) {
this.readInt32LE(out);
} else {
this.readUInt32LE(out);
}
} else {
this.readUInt32BE(out);
if (this.ref.signed) {
this.readInt32BE(out);
} else {
this.readUInt32BE(out);
}
}
break;
}
Expand All @@ -51,14 +75,32 @@ export class Int extends Node<frontend.node.Int> {
const ctx = this.compilation;
const index = ctx.stateField(this.ref.field);

out.push(`${index} = (${ctx.bufArg()}[${ctx.offArg()}] & 2 ** 7) * 0x1fffffe;`)
out.push(`${index} = (${ctx.bufArg()}[${ctx.offArg()}] & 2 ** 7) * 0x1fffffe;`);
}

private readUInt8(out: string[]) {
const ctx = this.compilation;
const index = ctx.stateField(this.ref.field);

out.push(`${index} = ${ctx.bufArg()}[${ctx.offArg()}];`)
out.push(`${index} = ${ctx.bufArg()}[${ctx.offArg()}];`);
}

private readInt16LE(out: string[]) {
const ctx = this.compilation;
const index = ctx.stateField(this.ref.field);

switch (this.ref.byteOffset) {
case 0: {
out.push(`${index} = ${ctx.bufArg()}[${ctx.offArg()}];`);
break;
}

case 1: {
out.push(`${index} += ${ctx.bufArg()}[${ctx.offArg()}] * 2 ** 8;`);
out.push(`${index} |= (${index} & 2 ** 15) * 0x1fffe;`);
break;
}
}
}

private readUInt16LE(out: string[]) {
Expand All @@ -67,7 +109,7 @@ export class Int extends Node<frontend.node.Int> {

switch (this.ref.byteOffset) {
case 0: {
out.push(`${index} = ${ctx.bufArg()}[${ctx.offArg()}];`)
out.push(`${index} = ${ctx.bufArg()}[${ctx.offArg()}];`);
break;
}

Expand All @@ -78,13 +120,36 @@ export class Int extends Node<frontend.node.Int> {
}
}

private readInt24LE(out: string[]) {
const ctx = this.compilation;
const index = ctx.stateField(this.ref.field);

switch (this.ref.byteOffset) {
case 0: {
out.push(`${index} = ${ctx.bufArg()}[${ctx.offArg()}];`);
break;
}

case 1: {
out.push(`${index} += ${ctx.bufArg()}[${ctx.offArg()}] * 2 ** 8;`);
break;
}

case 2: {
out.push(`${index} += ${ctx.bufArg()}[${ctx.offArg()}] * 2 ** 16;`);
out.push(`${index} |= (${index} & 2 ** 23) * 0x1fe`);
break;
}
}
}

private readUInt24LE(out: string[]) {
const ctx = this.compilation;
const index = ctx.stateField(this.ref.field);

switch (this.ref.byteOffset) {
case 0: {
out.push(`${index} = ${ctx.bufArg()}[${ctx.offArg()}];`)
out.push(`${index} = ${ctx.bufArg()}[${ctx.offArg()}];`);
break;
}

Expand All @@ -100,13 +165,40 @@ export class Int extends Node<frontend.node.Int> {
}
}

private readInt32LE(out: string[]) {
const ctx = this.compilation;
const index = ctx.stateField(this.ref.field);

switch (this.ref.byteOffset) {
case 0: {
out.push(`${index} = ${ctx.bufArg()}[${ctx.offArg()}];`);
break;
}

case 1: {
out.push(`${index} += ${ctx.bufArg()}[${ctx.offArg()}] * 2 ** 8;`);
break;
}

case 2: {
out.push(`${index} += ${ctx.bufArg()}[${ctx.offArg()}] * 2 ** 16;`);
break;
}

case 3: {
out.push(`${index} += ${ctx.bufArg()}[${ctx.offArg()}] << 24;`); // Overflow
break;
}
}
}

private readUInt32LE(out: string[]) {
const ctx = this.compilation;
const index = ctx.stateField(this.ref.field);

switch (this.ref.byteOffset) {
case 0: {
out.push(`${index} = ${ctx.bufArg()}[${ctx.offArg()}];`)
out.push(`${index} = ${ctx.bufArg()}[${ctx.offArg()}];`);
break;
}

Expand All @@ -127,6 +219,24 @@ export class Int extends Node<frontend.node.Int> {
}
}

private readInt16BE(out: string[]) {
const ctx = this.compilation;
const index = ctx.stateField(this.ref.field);

switch (this.ref.byteOffset) {
case 0: {
out.push(`${index} = ${ctx.bufArg()}[${ctx.offArg()}] * 2 ** 8;`);
break;
}

case 1: {
out.push(`${index} += ${ctx.bufArg()}[${ctx.offArg()}];`);
out.push(`${index} |= (${index} & 2 ** 15) * 0x1fffe;`);
break;
}
}
}

private readUInt16BE(out: string[]) {
const ctx = this.compilation;
const index = ctx.stateField(this.ref.field);
Expand All @@ -138,7 +248,30 @@ export class Int extends Node<frontend.node.Int> {
}

case 1: {
out.push(`${index} += ${ctx.bufArg()}[${ctx.offArg()}];`)
out.push(`${index} += ${ctx.bufArg()}[${ctx.offArg()}];`);
break;
}
}
}

private readInt24BE(out: string[]) {
const ctx = this.compilation;
const index = ctx.stateField(this.ref.field);

switch (this.ref.byteOffset) {
case 0: {
out.push(`${index} = ${ctx.bufArg()}[${ctx.offArg()}] * 2 ** 16;`);
break;
}

case 1: {
out.push(`${index} += ${ctx.bufArg()}[${ctx.offArg()}] * 2 ** 8;`);
break;
}

case 2: {
out.push(`${index} += ${ctx.bufArg()}[${ctx.offArg()}];`);
out.push(`${index} |= (${index} & 2 ** 23) * 0x1fe;`);
break;
}
}
Expand All @@ -160,7 +293,34 @@ export class Int extends Node<frontend.node.Int> {
}

case 2: {
out.push(`${index} += ${ctx.bufArg()}[${ctx.offArg()}];`)
out.push(`${index} += ${ctx.bufArg()}[${ctx.offArg()}];`);
break;
}
}
}

private readInt32BE(out: string[]) {
const ctx = this.compilation;
const index = ctx.stateField(this.ref.field);

switch (this.ref.byteOffset) {
case 0: {
out.push(`${index} = ${ctx.bufArg()}[${ctx.offArg()}] << 24;`); // Overflow
break;
}

case 1: {
out.push(`${index} += ${ctx.bufArg()}[${ctx.offArg()}] * 2 ** 16;`);
break;
}

case 2: {
out.push(`${index} += ${ctx.bufArg()}[${ctx.offArg()}] * 2 ** 8;`);
break;
}

case 3: {
out.push(`${index} += ${ctx.bufArg()}[${ctx.offArg()}];`);
break;
}
}
Expand All @@ -187,7 +347,7 @@ export class Int extends Node<frontend.node.Int> {
}

case 3: {
out.push(`${index} += ${ctx.bufArg()}[${ctx.offArg()}];`)
out.push(`${index} += ${ctx.bufArg()}[${ctx.offArg()}];`);
break;
}
}
Expand Down