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Add big endian methods #11

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merged 1 commit into from
Feb 23, 2024
Merged

Add big endian methods #11

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78 changes: 77 additions & 1 deletion browser.js
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Original file line number Diff line number Diff line change
Expand Up @@ -466,6 +466,74 @@ function readInt32LE (buffer, offset) {
return view.getInt32(offset, true)
}

function writeDoubleBE (buffer, value, offset) {
if (offset === undefined) offset = 0

const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
view.setFloat64(offset, value, false)

return offset + 8
}

function writeFloatBE (buffer, value, offset) {
if (offset === undefined) offset = 0

const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
view.setFloat32(offset, value, false)

return offset + 4
}

function writeUInt32BE (buffer, value, offset) {
if (offset === undefined) offset = 0

const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
view.setUint32(offset, value, false)

return offset + 4
}

function writeInt32BE (buffer, value, offset) {
if (offset === undefined) offset = 0

const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)
view.setInt32(offset, value, false)

return offset + 4
}

function readDoubleBE (buffer, offset) {
if (offset === undefined) offset = 0

const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)

return view.getFloat64(offset, false)
}

function readFloatBE (buffer, offset) {
if (offset === undefined) offset = 0

const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)

return view.getFloat32(offset, false)
}

function readUInt32BE (buffer, offset) {
if (offset === undefined) offset = 0

const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)

return view.getUint32(offset, false)
}

function readInt32BE (buffer, offset) {
if (offset === undefined) offset = 0

const view = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength)

return view.getInt32(offset, false)
}

module.exports = exports = {
isBuffer,
isEncoding,
Expand Down Expand Up @@ -495,5 +563,13 @@ module.exports = exports = {
readDoubleLE,
readFloatLE,
readUInt32LE,
readInt32LE
readInt32LE,
writeDoubleBE,
writeFloatBE,
writeUInt32BE,
writeInt32BE,
readDoubleBE,
readFloatBE,
readUInt32BE,
readInt32BE
}
43 changes: 42 additions & 1 deletion index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -115,6 +115,38 @@ function readInt32LE (buffer, offset) {
return toBuffer(buffer).readInt32LE(offset)
}

function writeDoubleBE (buffer, value, offset) {
return toBuffer(buffer).writeDoubleBE(value, offset)
}

function writeFloatBE (buffer, value, offset) {
return toBuffer(buffer).writeFloatBE(value, offset)
}

function writeUInt32BE (buffer, value, offset) {
return toBuffer(buffer).writeUInt32BE(value, offset)
}

function writeInt32BE (buffer, value, offset) {
return toBuffer(buffer).writeInt32BE(value, offset)
}

function readDoubleBE (buffer, offset) {
return toBuffer(buffer).readDoubleBE(offset)
}

function readFloatBE (buffer, offset) {
return toBuffer(buffer).readFloatBE(offset)
}

function readUInt32BE (buffer, offset) {
return toBuffer(buffer).readUInt32BE(offset)
}

function readInt32BE (buffer, offset) {
return toBuffer(buffer).readInt32BE(offset)
}

module.exports = {
isBuffer,
isEncoding,
Expand Down Expand Up @@ -144,5 +176,14 @@ module.exports = {
readDoubleLE,
readFloatLE,
readUInt32LE,
readInt32LE
readInt32LE,
writeDoubleBE,
writeFloatBE,
writeUInt32BE,
writeInt32BE,
readDoubleBE,
readFloatBE,
readUInt32BE,
readInt32BE

}
189 changes: 189 additions & 0 deletions test/browser.mjs
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Original file line number Diff line number Diff line change
Expand Up @@ -406,3 +406,192 @@ test('readInt32LE', (t) => {
t.is(actual, expected)
})
})

test('writeFloatBE', (t) => {
t.test('offset 0', (t) => {
const buffer = b.alloc(4)
const updatedOffset = b.writeFloatBE(buffer, 123.5)

t.is(updatedOffset, 4)
t.is(new DataView(buffer.buffer).getFloat32(0, false), 123.5)
})

t.test('other offset', (t) => {
const buffer = b.alloc(8)
const updatedOffset = b.writeFloatBE(buffer, 123.5, 4)

t.is(updatedOffset, 8)
t.is(new DataView(buffer.buffer).getFloat32(4, false), 123.5)
})

t.test('sub-buffer', (t) => {
const buffer = b.alloc(8)
const sub = buffer.subarray(2)

b.writeFloatBE(sub, 123.5)

t.is(new DataView(buffer.buffer).getFloat32(2, false), 123.5)
})
})

test('writeUInt32BE', (t) => {
t.test('offset 0', (t) => {
const buffer = b.alloc(4)
const updatedOffset = b.writeUInt32BE(buffer, 123)

t.is(updatedOffset, 4)
t.is(new DataView(buffer.buffer).getUint32(0, false), 123)
})

t.test('other offset', (t) => {
const buffer = b.alloc(8)
const updatedOffset = b.writeUInt32BE(buffer, 123, 4)

t.is(updatedOffset, 8)
t.is(new DataView(buffer.buffer).getUint32(4, false), 123)
})

t.test('sub-buffer', (t) => {
const buffer = b.alloc(8)
const sub = buffer.subarray(2)

b.writeUInt32BE(sub, 123)

t.is(new DataView(buffer.buffer).getUint32(2, false), 123)
})
})

test('writeInt32BE', (t) => {
t.test('offset 0', (t) => {
const buffer = b.alloc(4)
const updatedOffset = b.writeInt32BE(buffer, 123)

t.is(updatedOffset, 4)
t.is(new DataView(buffer.buffer).getInt32(0, false), 123)
})

t.test('other offset', (t) => {
const buffer = b.alloc(8)
const updatedOffset = b.writeInt32BE(buffer, 123, 4)

t.is(updatedOffset, 8)
t.is(new DataView(buffer.buffer).getInt32(4, false), 123)
})

t.test('sub-buffer', (t) => {
const buffer = b.alloc(8)
const sub = buffer.subarray(2)

b.writeInt32BE(sub, 123)

t.is(new DataView(buffer.buffer).getInt32(2, false), 123)
})
})

test('readDoubleBE', (t) => {
const expected = 5.447603722011605e-270

t.test('offset 0', (t) => {
const buffer = new Uint8Array([8, 7, 6, 5, 4, 3, 2, 1])

const actual = b.readDoubleBE(buffer)
t.is(actual, expected)
})

t.test('other offset', (t) => {
const buffer = new Uint8Array(
[...new Array(8).fill(0), ...[8, 7, 6, 5, 4, 3, 2, 1]]
)

const actual = b.readDoubleBE(buffer, 8)
t.is(actual, expected)
})

t.test('sub-buffer', (t) => {
const buffer = new Uint8Array(
[...new Array(4).fill(0), ...[8, 7, 6, 5, 4, 3, 2, 1]]
)
const sub = buffer.subarray(4)

const actual = b.readDoubleBE(sub)
t.is(actual, expected)
})
})

test('readFloatBE', (t) => {
const expected = 1.539989614439558e-36

t.test('offset 0', (t) => {
const buffer = new Uint8Array([4, 3, 2, 1])

const actual = b.readFloatBE(buffer)
t.is(actual, expected)
})

t.test('other offset', (t) => {
const buffer = new Uint8Array([0, 0, 0, 0, 4, 3, 2, 1])

const actual = b.readFloatBE(buffer, 4)
t.is(actual, expected)
})

t.test('sub-buffer', (t) => {
const buffer = new Uint8Array([0, 0, 4, 3, 2, 1])
const sub = buffer.subarray(2)

const actual = b.readFloatBE(sub)
t.is(actual, expected)
})
})

test('readUInt32BE', (t) => {
const expected = '78563412'

t.test('Offset 0', (t) => {
const buffer = new Uint8Array([0x78, 0x56, 0x34, 0x12])

const actual = b.readUInt32BE(buffer).toString(16)
t.is(actual, expected)
})

t.test('other offset', (t) => {
const buffer = new Uint8Array([0, 0, 0, 0, 0x78, 0x56, 0x34, 0x12])

const actual = b.readUInt32BE(buffer, 4).toString(16)
t.is(actual, expected)
})

t.test('sub-buffer', (t) => {
const buffer = new Uint8Array([0, 0, 0x78, 0x56, 0x34, 0x12])
const sub = buffer.subarray(2)

const actual = b.readUInt32BE(sub).toString(16)
t.is(actual, expected)
})
})

test('readInt32BE', (t) => {
const expected = 83886080

t.test('Offset 0', (t) => {
const buffer = new Uint8Array([5, 0, 0, 0])

const actual = b.readInt32BE(buffer)
t.is(actual, expected)
})

t.test('other offset', (t) => {
const buffer = new Uint8Array([0, 0, 0, 0, 5, 0, 0, 0])

const actual = b.readInt32BE(buffer, 4)
t.is(actual, expected)
})

t.test('sub-buffer', (t) => {
const buffer = new Uint8Array([0, 0, 5, 0, 0, 0])
const sub = buffer.subarray(2)

const actual = b.readInt32BE(sub)
t.is(actual, expected)
})
})
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