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test-buffer.js
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test-buffer.js
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require("../common");
assert = require("assert");
var Buffer = require('buffer').Buffer;
var b = new Buffer(1024);
console.log("b.length == " + b.length);
assert.strictEqual(1024, b.length);
for (var i = 0; i < 1024; i++) {
assert.ok(b[i] >= 0);
b[i] = i % 256;
}
for (var i = 0; i < 1024; i++) {
assert.equal(i % 256, b[i]);
}
var c = new Buffer(512);
// copy 512 bytes, from 0 to 512.
var copied = b.copy(c, 0, 0, 512);
console.log("copied " + copied + " bytes from b into c");
assert.strictEqual(512, copied);
for (var i = 0; i < c.length; i++) {
print('.');
assert.equal(i % 256, c[i]);
}
console.log("");
// try to copy 513 bytes, and hope we don't overrun c, which is only 512 long
var copied = b.copy(c, 0, 0, 513);
console.log("copied " + copied + " bytes from b into c");
assert.strictEqual(512, copied);
for (var i = 0; i < c.length; i++) {
assert.equal(i % 256, c[i]);
}
// copy all of c back into b, without specifying sourceEnd
var copied = c.copy(b, 0, 0);
console.log("copied " + copied + " bytes from c back into b");
assert.strictEqual(512, copied);
for (var i = 0; i < b.length; i++) {
assert.equal(i % 256, b[i]);
}
// copy 768 bytes from b into b
var copied = b.copy(b, 0, 256, 1024);
console.log("copied " + copied + " bytes from b into c");
assert.strictEqual(768, copied);
for (var i = 0; i < c.length; i++) {
assert.equal(i % 256, c[i]);
}
var caught_error = null;
// try to copy from before the beginning of b
caught_error = null;
try {
var copied = b.copy(c, 0, 100, 10);
} catch (err) {
caught_error = err;
}
assert.strictEqual('sourceEnd < sourceStart', caught_error.message);
// try to copy to before the beginning of c
caught_error = null;
try {
var copied = b.copy(c, -1, 0, 10);
} catch (err) {
caught_error = err;
}
assert.strictEqual('targetStart out of bounds', caught_error.message);
// try to copy to after the end of c
caught_error = null;
try {
var copied = b.copy(c, 512, 0, 10);
} catch (err) {
caught_error = err;
}
assert.strictEqual('targetStart out of bounds', caught_error.message);
// try to copy starting before the beginning of b
caught_error = null;
try {
var copied = b.copy(c, 0, -1, 1);
} catch (err) {
caught_error = err;
}
assert.strictEqual('sourceStart out of bounds', caught_error.message);
// try to copy starting after the end of b
caught_error = null;
try {
var copied = b.copy(c, 0, 1024, 1024);
} catch (err) {
caught_error = err;
}
assert.strictEqual('sourceStart out of bounds', caught_error.message);
// a too-low sourceEnd will get caught by earlier checks
// try to copy ending after the end of b
try {
var copied = b.copy(c, 0, 1023, 1025);
} catch (err) {
caught_error = err;
}
assert.strictEqual('sourceEnd out of bounds', caught_error.message);
var asciiString = "hello world";
var offset = 100;
for (var j = 0; j < 500; j++) {
for (var i = 0; i < asciiString.length; i++) {
b[i] = asciiString.charCodeAt(i);
}
var asciiSlice = b.toString('ascii', 0, asciiString.length);
assert.equal(asciiString, asciiSlice);
var written = b.asciiWrite(asciiString, offset);
assert.equal(asciiString.length, written);
var asciiSlice = b.toString('ascii', offset, offset+asciiString.length);
assert.equal(asciiString, asciiSlice);
var sliceA = b.slice(offset, offset+asciiString.length);
var sliceB = b.slice(offset, offset+asciiString.length);
for (var i = 0; i < asciiString.length; i++) {
assert.equal(sliceA[i], sliceB[i]);
}
// TODO utf8 slice tests
}
for (var j = 0; j < 100; j++) {
var slice = b.slice(100, 150);
assert.equal(50, slice.length);
for (var i = 0; i < 50; i++) {
assert.equal(b[100+i], slice[i]);
}
}
// unpack
var b = new Buffer(10);
b[0] = 0x00;
b[1] = 0x01;
b[2] = 0x03;
b[3] = 0x00;
assert.deepEqual([0x0001], b.unpack('n', 0));
assert.deepEqual([0x0001, 0x0300], b.unpack('nn', 0));
assert.deepEqual([0x0103], b.unpack('n', 1));
assert.deepEqual([0x0300], b.unpack('n', 2));
assert.deepEqual([0x00010300], b.unpack('N', 0));
assert.throws(function () {
b.unpack('N', 8);
});
b[4] = 0xDE;
b[5] = 0xAD;
b[6] = 0xBE;
b[7] = 0xEF;
assert.deepEqual([0xDEADBEEF], b.unpack('N', 4));
// Bug regression test
var testValue = '\u00F6\u65E5\u672C\u8A9E'; // ö日本語
var buffer = new Buffer(32);
var size = buffer.utf8Write(testValue, 0);
console.log('bytes written to buffer: ' + size);
var slice = buffer.toString('utf8', 0, size);
assert.equal(slice, testValue);
// Test triple slice
var a = new Buffer(8);
for (var i = 0; i < 8; i++) a[i] = i;
var b = a.slice(4,8);
assert.equal(4, b[0]);
assert.equal(5, b[1]);
assert.equal(6, b[2]);
assert.equal(7, b[3]);
var c = b.slice(2 , 4);
assert.equal(6, c[0]);
assert.equal(7, c[1]);
var d = new Buffer([23, 42, 255]);
assert.equal(d.length, 3);
assert.equal(d[0], 23);
assert.equal(d[1], 42);
assert.equal(d[2], 255);
var e = new Buffer('über');
assert.deepEqual(e, new Buffer([195, 188, 98, 101, 114]));
var f = new Buffer('über', 'ascii');
assert.deepEqual(f, new Buffer([252, 98, 101, 114]));