assemblyscript/src/util/binary.ts at main · StaticScript/assemblyscript · GitHub

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/**

* @fileoverview Various binary reading and writing utility.

* @license Apache-2.0

/** Reads an 8-bit integer from the specified buffer. */

export function readI8(buffer: Uint8Array, offset: i32): i32 {

return buffer[offset];

}

/** Writes an 8-bit integer to the specified buffer. */

export function writeI8(value: i32, buffer: Uint8Array, offset: i32): void {

buffer[offset] = value;

}

/** Reads a 16-bit integer from the specified buffer. */

export function readI16(buffer: Uint8Array, offset: i32): i32 {

return i32(buffer[offset ])

| i32(buffer[offset + 1]) << 8;

}

/** Writes a 16-bit integer to the specified buffer. */

export function writeI16(value: i32, buffer: Uint8Array, offset: i32): void {

buffer[offset ] = value;

buffer[offset + 1] = value >>> 8;

}

/** Reads a 32-bit integer from the specified buffer. */

export function readI32(buffer: Uint8Array, offset: i32): i32 {

return i32(buffer[offset ])

| i32(buffer[offset + 1]) << 8

| i32(buffer[offset + 2]) << 16

| i32(buffer[offset + 3]) << 24;

}

/** Writes a 32-bit integer to the specified buffer. */

export function writeI32(value: i32, buffer: Uint8Array, offset: i32): void {

buffer[offset ] = value;

buffer[offset + 1] = value >>> 8;

buffer[offset + 2] = value >>> 16;

buffer[offset + 3] = value >>> 24;

}

/** Writes a 32-bit integer as a 64-bit integer to the specified buffer. */

export function writeI32AsI64(value: i32, buffer: Uint8Array, offset: i32, unsigned: bool = false): void {

writeI32(value, buffer, offset);

writeI32(unsigned || value >= 0 ? 0 : -1, buffer, offset + 4);

}

/** Reads a 64-bit integer from the specified buffer. */

export function readI64(buffer: Uint8Array, offset: i32): i64 {

var lo = readI32(buffer, offset);

var hi = readI32(buffer, offset + 4);

return i64_new(lo, hi);

}

/** Writes a 64-bit integer to the specified buffer. */

export function writeI64(value: i64, buffer: Uint8Array, offset: i32): void {

writeI32(i64_low(value), buffer, offset);

writeI32(i64_high(value), buffer, offset + 4);

}

/** Writes a 64-bit integer as a 32-bit integer to the specified buffer. */

export function writeI64AsI32(value: i64, buffer: Uint8Array, offset: i32, unsigned: bool = false): void {

assert(unsigned ? i64_is_u32(value) : i64_is_i32(value));

writeI32(i64_low(value), buffer, offset);

}

/** Reads a 32-bit float from the specified buffer. */

export function readF32(buffer: Uint8Array, offset: i32): f32 {

return i32_as_f32(readI32(buffer, offset));

}

/** Writes a 32-bit float to the specified buffer. */

export function writeF32(value: f32, buffer: Uint8Array, offset: i32): void {

writeI32(f32_as_i32(value), buffer, offset);

}

/** Reads a 64-bit float from the specified buffer. */

export function readF64(buffer: Uint8Array, offset: i32): f64 {

return i64_as_f64(readI64(buffer, offset));

}

/** Writes a 64-bit float to the specified buffer. */

export function writeF64(value: f64, buffer: Uint8Array, offset: i32): void {

var valueI64 = f64_as_i64(value);

writeI32(i64_low(valueI64), buffer, offset);

writeI32(i64_high(valueI64), buffer, offset + 4);

}

/** Reads a 128-bit vector from the specified buffer. */

export function readV128(buffer: Uint8Array, offset: i32): Uint8Array {

return buffer.slice(offset, offset + 16);

}

/** Writes a 128-bit vector to the specified buffer. */

export function writeV128(value: Uint8Array, buffer: Uint8Array, offset: i32): void {

assert(value.length == 16);

buffer.set(value, offset);

}

assemblyscript/src/util/binary.ts at main · StaticScript/assemblyscript · GitHub

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