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61 lines
2.2 KiB
61 lines
2.2 KiB
9 years ago
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'use strict';
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require('../common');
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const assert = require('assert');
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const buf = Buffer.from([0x1, 0x2, 0x3, 0x4]);
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assert.strictEqual(buf, buf.swap16());
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assert.deepStrictEqual(buf, Buffer.from([0x2, 0x1, 0x4, 0x3]));
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assert.strictEqual(buf, buf.swap32());
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assert.deepStrictEqual(buf, Buffer.from([0x3, 0x4, 0x1, 0x2]));
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const buf_array = [];
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for (var i = 1; i < 33; i++)
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buf_array.push(i);
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const buf2 = Buffer.from(buf_array);
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buf2.swap32();
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assert.deepStrictEqual(buf2,
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Buffer.from([0x04, 0x03, 0x02, 0x01, 0x08, 0x07, 0x06, 0x05, 0x0c,
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0x0b, 0x0a, 0x09, 0x10, 0x0f, 0x0e, 0x0d, 0x14, 0x13,
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0x12, 0x11, 0x18, 0x17, 0x16, 0x15, 0x1c, 0x1b, 0x1a,
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0x19, 0x20, 0x1f, 0x1e, 0x1d]));
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buf2.swap16();
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assert.deepStrictEqual(buf2,
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Buffer.from([0x03, 0x04, 0x01, 0x02, 0x07, 0x08, 0x05, 0x06, 0x0b,
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0x0c, 0x09, 0x0a, 0x0f, 0x10, 0x0d, 0x0e, 0x13, 0x14,
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0x11, 0x12, 0x17, 0x18, 0x15, 0x16, 0x1b, 0x1c, 0x19,
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0x1a, 0x1f, 0x20, 0x1d, 0x1e]));
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const buf3 = Buffer.from([0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7]);
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buf3.slice(1, 5).swap32();
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assert.deepStrictEqual(buf3, Buffer.from([0x1, 0x5, 0x4, 0x3, 0x2, 0x6, 0x7]));
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buf3.slice(1, 5).swap16();
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assert.deepStrictEqual(buf3, Buffer.from([0x1, 0x4, 0x5, 0x2, 0x3, 0x6, 0x7]));
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// Force use of native code (Buffer size above threshold limit for js impl)
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const buf4 = Buffer.allocUnsafe(1024).fill([0x1, 0x2, 0x3, 0x4]);
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const buf5 = Buffer.allocUnsafe(1024).fill([0x2, 0x1, 0x4, 0x3]);
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const buf6 = Buffer.allocUnsafe(1024)
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.fill([0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8]);
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const buf7 = Buffer.allocUnsafe(1024)
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.fill([0x4, 0x3, 0x2, 0x1, 0x8, 0x7, 0x6, 0x5]);
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buf4.swap16();
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assert.deepStrictEqual(buf4, buf5);
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buf6.swap32();
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assert.deepStrictEqual(buf6, buf7);
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const re16 = /Buffer size must be a multiple of 16-bits/;
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const re32 = /Buffer size must be a multiple of 32-bits/;
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assert.throws(() => Buffer.from(buf3).swap16(), re16);
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assert.throws(() => Buffer.alloc(1025).swap16(), re16);
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assert.throws(() => Buffer.from(buf3).swap32(), re32);
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assert.throws(() => buf3.slice(1, 3).swap32(), re32);
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assert.throws(() => Buffer.alloc(1025).swap32(), re32);
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