compound-binary-file-js
Version:
This is an implementation of [Compound Binary File v.3](https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-cfb/53989ce4-7b05-4f8d-829b-d08d6148375b) \ Allows reading existing files, creation of the/write operation
77 lines • 3.4 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
var ReferencingSubview_1 = require("./ReferencingSubview");
var SimpleDataview_1 = require("./SimpleDataview");
var utils_1 = require("../utils");
/**
* @internal
*/
var FixedSizeChunkedDataview = /** @class */ (function () {
function FixedSizeChunkedDataview(chunkSize, dataChunks) {
var _a;
this.chunks = [];
this.chunkSize = chunkSize;
if (dataChunks != null) {
if (typeof dataChunks[0] === 'number') {
if (dataChunks.length % chunkSize !== 0)
throw new Error("The passed bytes array should be divisible by chunk size. Actual array size : " + dataChunks.length + "; chunk size: " + chunkSize + ".");
var dataLength = dataChunks.length;
var rawView = new SimpleDataview_1.SimpleDataview(dataChunks);
for (var i = 0; i < dataLength; i += 512) {
this.chunks.push(new ReferencingSubview_1.ReferencingSubview(rawView, i, i + 512));
}
}
else {
(_a = this.chunks).push.apply(_a, dataChunks);
}
}
}
FixedSizeChunkedDataview.prototype.writeAt = function (position, bytes) {
return this.chunks[Math.floor(position / 512)].writeAt(position % 512, bytes);
};
FixedSizeChunkedDataview.prototype.getSize = function () {
return this.chunks.length * this.chunkSize;
};
FixedSizeChunkedDataview.prototype.getData = function () {
var result = [];
for (var _i = 0, _a = this.chunks; _i < _a.length; _i++) {
var chunk = _a[_i];
result.push.apply(result, chunk.getData());
}
return result;
};
FixedSizeChunkedDataview.prototype.subView = function (start, end) {
if (end == null)
throw new Error("'end' parameter is mandatory");
if (Math.floor(start / this.chunkSize) !== Math.floor((end - 1) / this.chunkSize))
throw new Error("Can only get subview enclosed by one chunk. Actual values: " + start + " - " + end);
if (start === end)
throw new Error("Cannot get subview of size 0");
var chunk = this.chunks[Math.floor(start / this.chunkSize)];
if (end % this.chunkSize === 0) {
return chunk.subView(start % this.chunkSize);
}
else {
return chunk.subView(start % this.chunkSize, end % this.chunkSize);
}
};
FixedSizeChunkedDataview.prototype.allocate = function (length) {
if (length !== this.chunkSize)
throw new Error();
var view = new SimpleDataview_1.SimpleDataview(utils_1.initializedWidth(length, 0));
this.chunks.push(view);
return view;
};
FixedSizeChunkedDataview.prototype.fill = function (filler) {
throw new Error("Unsupported operation");
};
FixedSizeChunkedDataview.prototype.readAt = function (position, length) {
throw new Error("Unsupported operation");
};
FixedSizeChunkedDataview.prototype.isEmpty = function () {
return false;
};
return FixedSizeChunkedDataview;
}());
exports.FixedSizeChunkedDataview = FixedSizeChunkedDataview;
//# sourceMappingURL=FixedSizeChunkedDataview.js.map