forked from mirror/pixelfed
810 lines
24 KiB
JavaScript
810 lines
24 KiB
JavaScript
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/* Blob.js
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* A Blob, File, FileReader & URL implementation.
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* 2019-04-19
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*
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* By Eli Grey, http://eligrey.com
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* By Jimmy Wärting, https://github.com/jimmywarting
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* License: MIT
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* See https://github.com/eligrey/Blob.js/blob/master/LICENSE.md
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*/
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;(function () {
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var global = typeof window === 'object'
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? window : typeof self === 'object'
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? self : this
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var BlobBuilder = global.BlobBuilder
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|| global.WebKitBlobBuilder
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|| global.MSBlobBuilder
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|| global.MozBlobBuilder
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global.URL = global.URL || global.webkitURL || function (href, a) {
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a = document.createElement('a')
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a.href = href
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return a
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}
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var origBlob = global.Blob
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var createObjectURL = URL.createObjectURL
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var revokeObjectURL = URL.revokeObjectURL
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var strTag = global.Symbol && global.Symbol.toStringTag
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var blobSupported = false
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var blobSupportsArrayBufferView = false
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var arrayBufferSupported = !!global.ArrayBuffer
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var blobBuilderSupported = BlobBuilder
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&& BlobBuilder.prototype.append
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&& BlobBuilder.prototype.getBlob
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try {
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// Check if Blob constructor is supported
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blobSupported = new Blob(['ä']).size === 2
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// Check if Blob constructor supports ArrayBufferViews
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// Fails in Safari 6, so we need to map to ArrayBuffers there.
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blobSupportsArrayBufferView = new Blob([new Uint8Array([1, 2])]).size === 2
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} catch (e) {}
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/**
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* Helper function that maps ArrayBufferViews to ArrayBuffers
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* Used by BlobBuilder constructor and old browsers that didn't
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* support it in the Blob constructor.
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*/
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function mapArrayBufferViews (ary) {
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return ary.map(function (chunk) {
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if (chunk.buffer instanceof ArrayBuffer) {
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var buf = chunk.buffer
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// if this is a subarray, make a copy so we only
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// include the subarray region from the underlying buffer
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if (chunk.byteLength !== buf.byteLength) {
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var copy = new Uint8Array(chunk.byteLength)
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copy.set(new Uint8Array(buf, chunk.byteOffset, chunk.byteLength))
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buf = copy.buffer
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}
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return buf
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}
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return chunk
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})
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}
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function BlobBuilderConstructor (ary, options) {
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options = options || {}
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var bb = new BlobBuilder()
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mapArrayBufferViews(ary).forEach(function (part) {
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bb.append(part)
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})
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return options.type ? bb.getBlob(options.type) : bb.getBlob()
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}
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function BlobConstructor (ary, options) {
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return new origBlob(mapArrayBufferViews(ary), options || {})
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}
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if (global.Blob) {
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BlobBuilderConstructor.prototype = Blob.prototype
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BlobConstructor.prototype = Blob.prototype
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}
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/********************************************************/
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/* String Encoder fallback */
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/********************************************************/
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function stringEncode (string) {
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var pos = 0
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var len = string.length
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var Arr = global.Uint8Array || Array // Use byte array when possible
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var at = 0 // output position
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var tlen = Math.max(32, len + (len >> 1) + 7) // 1.5x size
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var target = new Arr((tlen >> 3) << 3) // ... but at 8 byte offset
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while (pos < len) {
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var value = string.charCodeAt(pos++)
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if (value >= 0xd800 && value <= 0xdbff) {
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// high surrogate
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if (pos < len) {
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var extra = string.charCodeAt(pos)
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if ((extra & 0xfc00) === 0xdc00) {
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++pos
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value = ((value & 0x3ff) << 10) + (extra & 0x3ff) + 0x10000
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}
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}
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if (value >= 0xd800 && value <= 0xdbff) {
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continue // drop lone surrogate
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}
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}
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// expand the buffer if we couldn't write 4 bytes
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if (at + 4 > target.length) {
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tlen += 8 // minimum extra
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tlen *= (1.0 + (pos / string.length) * 2) // take 2x the remaining
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tlen = (tlen >> 3) << 3 // 8 byte offset
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var update = new Uint8Array(tlen)
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update.set(target)
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target = update
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}
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if ((value & 0xffffff80) === 0) { // 1-byte
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target[at++] = value // ASCII
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continue
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} else if ((value & 0xfffff800) === 0) { // 2-byte
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target[at++] = ((value >> 6) & 0x1f) | 0xc0
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} else if ((value & 0xffff0000) === 0) { // 3-byte
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target[at++] = ((value >> 12) & 0x0f) | 0xe0
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target[at++] = ((value >> 6) & 0x3f) | 0x80
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} else if ((value & 0xffe00000) === 0) { // 4-byte
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target[at++] = ((value >> 18) & 0x07) | 0xf0
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target[at++] = ((value >> 12) & 0x3f) | 0x80
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target[at++] = ((value >> 6) & 0x3f) | 0x80
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} else {
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// FIXME: do we care
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continue
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}
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target[at++] = (value & 0x3f) | 0x80
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}
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return target.slice(0, at)
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}
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/********************************************************/
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/* String Decoder fallback */
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/********************************************************/
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function stringDecode (buf) {
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var end = buf.length
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var res = []
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var i = 0
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while (i < end) {
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var firstByte = buf[i]
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var codePoint = null
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var bytesPerSequence = (firstByte > 0xEF) ? 4
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: (firstByte > 0xDF) ? 3
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: (firstByte > 0xBF) ? 2
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: 1
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if (i + bytesPerSequence <= end) {
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var secondByte, thirdByte, fourthByte, tempCodePoint
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switch (bytesPerSequence) {
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case 1:
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if (firstByte < 0x80) {
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codePoint = firstByte
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}
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break
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case 2:
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secondByte = buf[i + 1]
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if ((secondByte & 0xC0) === 0x80) {
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tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
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if (tempCodePoint > 0x7F) {
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codePoint = tempCodePoint
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}
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}
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break
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case 3:
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secondByte = buf[i + 1]
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thirdByte = buf[i + 2]
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if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
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tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
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if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
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codePoint = tempCodePoint
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}
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}
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break
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case 4:
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secondByte = buf[i + 1]
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thirdByte = buf[i + 2]
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fourthByte = buf[i + 3]
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if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
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tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
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if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
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codePoint = tempCodePoint
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}
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}
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}
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}
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if (codePoint === null) {
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// we did not generate a valid codePoint so insert a
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// replacement char (U+FFFD) and advance only 1 byte
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codePoint = 0xFFFD
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bytesPerSequence = 1
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} else if (codePoint > 0xFFFF) {
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// encode to utf16 (surrogate pair dance)
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codePoint -= 0x10000
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res.push(codePoint >>> 10 & 0x3FF | 0xD800)
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codePoint = 0xDC00 | codePoint & 0x3FF
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}
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res.push(codePoint)
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i += bytesPerSequence
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}
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var len = res.length
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var str = ''
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var i = 0
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while (i < len) {
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str += String.fromCharCode.apply(String, res.slice(i, i += 0x1000))
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}
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return str
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}
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// string -> buffer
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var textEncode = typeof TextEncoder === 'function'
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? TextEncoder.prototype.encode.bind(new TextEncoder())
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: stringEncode
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// buffer -> string
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var textDecode = typeof TextDecoder === 'function'
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? TextDecoder.prototype.decode.bind(new TextDecoder())
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: stringDecode
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function FakeBlobBuilder () {
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function isDataView (obj) {
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return obj && DataView.prototype.isPrototypeOf(obj)
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}
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function bufferClone (buf) {
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var view = new Array(buf.byteLength)
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var array = new Uint8Array(buf)
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var i = view.length
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while (i--) {
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view[i] = array[i]
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}
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return view
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}
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function array2base64 (input) {
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var byteToCharMap = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='
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var output = []
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for (var i = 0; i < input.length; i += 3) {
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var byte1 = input[i]
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var haveByte2 = i + 1 < input.length
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var byte2 = haveByte2 ? input[i + 1] : 0
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var haveByte3 = i + 2 < input.length
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var byte3 = haveByte3 ? input[i + 2] : 0
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var outByte1 = byte1 >> 2
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var outByte2 = ((byte1 & 0x03) << 4) | (byte2 >> 4)
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var outByte3 = ((byte2 & 0x0F) << 2) | (byte3 >> 6)
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var outByte4 = byte3 & 0x3F
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if (!haveByte3) {
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outByte4 = 64
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if (!haveByte2) {
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outByte3 = 64
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}
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}
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output.push(
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byteToCharMap[outByte1], byteToCharMap[outByte2],
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byteToCharMap[outByte3], byteToCharMap[outByte4]
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)
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}
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return output.join('')
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}
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var create = Object.create || function (a) {
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function c () {}
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c.prototype = a
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return new c()
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}
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if (arrayBufferSupported) {
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var viewClasses = [
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'[object Int8Array]',
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'[object Uint8Array]',
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'[object Uint8ClampedArray]',
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'[object Int16Array]',
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'[object Uint16Array]',
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'[object Int32Array]',
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'[object Uint32Array]',
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'[object Float32Array]',
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'[object Float64Array]'
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]
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var isArrayBufferView = ArrayBuffer.isView || function (obj) {
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return obj && viewClasses.indexOf(Object.prototype.toString.call(obj)) > -1
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}
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}
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function concatTypedarrays (chunks) {
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var size = 0
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var i = chunks.length
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while (i--) { size += chunks[i].length }
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var b = new Uint8Array(size)
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var offset = 0
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for (i = 0, l = chunks.length; i < l; i++) {
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var chunk = chunks[i]
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b.set(chunk, offset)
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offset += chunk.byteLength || chunk.length
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}
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return b
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}
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/********************************************************/
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/* Blob constructor */
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/********************************************************/
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function Blob (chunks, opts) {
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chunks = chunks || []
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opts = opts == null ? {} : opts
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for (var i = 0, len = chunks.length; i < len; i++) {
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var chunk = chunks[i]
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if (chunk instanceof Blob) {
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chunks[i] = chunk._buffer
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} else if (typeof chunk === 'string') {
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chunks[i] = textEncode(chunk)
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} else if (arrayBufferSupported && (ArrayBuffer.prototype.isPrototypeOf(chunk) || isArrayBufferView(chunk))) {
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chunks[i] = bufferClone(chunk)
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} else if (arrayBufferSupported && isDataView(chunk)) {
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chunks[i] = bufferClone(chunk.buffer)
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} else {
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chunks[i] = textEncode(String(chunk))
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}
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}
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this._buffer = global.Uint8Array
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? concatTypedarrays(chunks)
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: [].concat.apply([], chunks)
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this.size = this._buffer.length
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this.type = opts.type || ''
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if (/[^\u0020-\u007E]/.test(this.type)) {
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this.type = ''
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} else {
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this.type = this.type.toLowerCase()
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}
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}
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Blob.prototype.arrayBuffer = function () {
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return Promise.resolve(this._buffer)
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}
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Blob.prototype.text = function () {
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return Promise.resolve(textDecode(this._buffer))
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}
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Blob.prototype.slice = function (start, end, type) {
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var slice = this._buffer.slice(start || 0, end || this._buffer.length)
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return new Blob([slice], {type: type})
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}
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|
Blob.prototype.toString = function () {
|
||
|
|
return '[object Blob]'
|
||
|
|
}
|
||
|
|
|
||
|
|
/********************************************************/
|
||
|
|
/* File constructor */
|
||
|
|
/********************************************************/
|
||
|
|
function File (chunks, name, opts) {
|
||
|
|
opts = opts || {}
|
||
|
|
var a = Blob.call(this, chunks, opts) || this
|
||
|
|
a.name = name.replace(/\//g, ':')
|
||
|
|
a.lastModifiedDate = opts.lastModified ? new Date(opts.lastModified) : new Date()
|
||
|
|
a.lastModified = +a.lastModifiedDate
|
||
|
|
|
||
|
|
return a
|
||
|
|
}
|
||
|
|
|
||
|
|
File.prototype = create(Blob.prototype)
|
||
|
|
File.prototype.constructor = File
|
||
|
|
|
||
|
|
if (Object.setPrototypeOf) {
|
||
|
|
Object.setPrototypeOf(File, Blob)
|
||
|
|
} else {
|
||
|
|
try { File.__proto__ = Blob } catch (e) {}
|
||
|
|
}
|
||
|
|
|
||
|
|
File.prototype.toString = function () {
|
||
|
|
return '[object File]'
|
||
|
|
}
|
||
|
|
|
||
|
|
/********************************************************/
|
||
|
|
/* FileReader constructor */
|
||
|
|
/********************************************************/
|
||
|
|
function FileReader () {
|
||
|
|
if (!(this instanceof FileReader)) {
|
||
|
|
throw new TypeError("Failed to construct 'FileReader': Please use the 'new' operator, this DOM object constructor cannot be called as a function.")
|
||
|
|
}
|
||
|
|
|
||
|
|
var delegate = document.createDocumentFragment()
|
||
|
|
this.addEventListener = delegate.addEventListener
|
||
|
|
this.dispatchEvent = function (evt) {
|
||
|
|
var local = this['on' + evt.type]
|
||
|
|
if (typeof local === 'function') local(evt)
|
||
|
|
delegate.dispatchEvent(evt)
|
||
|
|
}
|
||
|
|
this.removeEventListener = delegate.removeEventListener
|
||
|
|
}
|
||
|
|
|
||
|
|
function _read (fr, blob, kind) {
|
||
|
|
if (!(blob instanceof Blob)) {
|
||
|
|
throw new TypeError("Failed to execute '" + kind + "' on 'FileReader': parameter 1 is not of type 'Blob'.")
|
||
|
|
}
|
||
|
|
|
||
|
|
fr.result = ''
|
||
|
|
|
||
|
|
setTimeout(function () {
|
||
|
|
this.readyState = FileReader.LOADING
|
||
|
|
fr.dispatchEvent(new Event('load'))
|
||
|
|
fr.dispatchEvent(new Event('loadend'))
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
FileReader.EMPTY = 0
|
||
|
|
FileReader.LOADING = 1
|
||
|
|
FileReader.DONE = 2
|
||
|
|
FileReader.prototype.error = null
|
||
|
|
FileReader.prototype.onabort = null
|
||
|
|
FileReader.prototype.onerror = null
|
||
|
|
FileReader.prototype.onload = null
|
||
|
|
FileReader.prototype.onloadend = null
|
||
|
|
FileReader.prototype.onloadstart = null
|
||
|
|
FileReader.prototype.onprogress = null
|
||
|
|
|
||
|
|
FileReader.prototype.readAsDataURL = function (blob) {
|
||
|
|
_read(this, blob, 'readAsDataURL')
|
||
|
|
this.result = 'data:' + blob.type + ';base64,' + array2base64(blob._buffer)
|
||
|
|
}
|
||
|
|
|
||
|
|
FileReader.prototype.readAsText = function (blob) {
|
||
|
|
_read(this, blob, 'readAsText')
|
||
|
|
this.result = textDecode(blob._buffer)
|
||
|
|
}
|
||
|
|
|
||
|
|
FileReader.prototype.readAsArrayBuffer = function (blob) {
|
||
|
|
_read(this, blob, 'readAsText')
|
||
|
|
// return ArrayBuffer when possible
|
||
|
|
this.result = (blob._buffer.buffer || blob._buffer).slice()
|
||
|
|
}
|
||
|
|
|
||
|
|
FileReader.prototype.abort = function () {}
|
||
|
|
|
||
|
|
/********************************************************/
|
||
|
|
/* URL */
|
||
|
|
/********************************************************/
|
||
|
|
URL.createObjectURL = function (blob) {
|
||
|
|
return blob instanceof Blob
|
||
|
|
? 'data:' + blob.type + ';base64,' + array2base64(blob._buffer)
|
||
|
|
: createObjectURL.call(URL, blob)
|
||
|
|
}
|
||
|
|
|
||
|
|
URL.revokeObjectURL = function (url) {
|
||
|
|
revokeObjectURL && revokeObjectURL.call(URL, url)
|
||
|
|
}
|
||
|
|
|
||
|
|
/********************************************************/
|
||
|
|
/* XHR */
|
||
|
|
/********************************************************/
|
||
|
|
var _send = global.XMLHttpRequest && global.XMLHttpRequest.prototype.send
|
||
|
|
if (_send) {
|
||
|
|
XMLHttpRequest.prototype.send = function (data) {
|
||
|
|
if (data instanceof Blob) {
|
||
|
|
this.setRequestHeader('Content-Type', data.type)
|
||
|
|
_send.call(this, textDecode(data._buffer))
|
||
|
|
} else {
|
||
|
|
_send.call(this, data)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
global.FileReader = FileReader
|
||
|
|
global.File = File
|
||
|
|
global.Blob = Blob
|
||
|
|
}
|
||
|
|
|
||
|
|
function fixFileAndXHR () {
|
||
|
|
var isIE = !!global.ActiveXObject || (
|
||
|
|
'-ms-scroll-limit' in document.documentElement.style &&
|
||
|
|
'-ms-ime-align' in document.documentElement.style
|
||
|
|
)
|
||
|
|
|
||
|
|
// Monkey patched
|
||
|
|
// IE don't set Content-Type header on XHR whose body is a typed Blob
|
||
|
|
// https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/6047383
|
||
|
|
var _send = global.XMLHttpRequest && global.XMLHttpRequest.prototype.send
|
||
|
|
if (isIE && _send) {
|
||
|
|
XMLHttpRequest.prototype.send = function (data) {
|
||
|
|
if (data instanceof Blob) {
|
||
|
|
this.setRequestHeader('Content-Type', data.type)
|
||
|
|
_send.call(this, data)
|
||
|
|
} else {
|
||
|
|
_send.call(this, data)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
try {
|
||
|
|
new File([], '')
|
||
|
|
} catch (e) {
|
||
|
|
try {
|
||
|
|
var klass = new Function('class File extends Blob {' +
|
||
|
|
'constructor(chunks, name, opts) {' +
|
||
|
|
'opts = opts || {};' +
|
||
|
|
'super(chunks, opts || {});' +
|
||
|
|
'this.name = name.replace(/\//g, ":");' +
|
||
|
|
'this.lastModifiedDate = opts.lastModified ? new Date(opts.lastModified) : new Date();' +
|
||
|
|
'this.lastModified = +this.lastModifiedDate;' +
|
||
|
|
'}};' +
|
||
|
|
'return new File([], ""), File'
|
||
|
|
)()
|
||
|
|
global.File = klass
|
||
|
|
} catch (e) {
|
||
|
|
var klass = function (b, d, c) {
|
||
|
|
var blob = new Blob(b, c)
|
||
|
|
var t = c && void 0 !== c.lastModified ? new Date(c.lastModified) : new Date()
|
||
|
|
|
||
|
|
blob.name = d.replace(/\//g, ':')
|
||
|
|
blob.lastModifiedDate = t
|
||
|
|
blob.lastModified = +t
|
||
|
|
blob.toString = function () {
|
||
|
|
return '[object File]'
|
||
|
|
}
|
||
|
|
|
||
|
|
if (strTag) {
|
||
|
|
blob[strTag] = 'File'
|
||
|
|
}
|
||
|
|
|
||
|
|
return blob
|
||
|
|
}
|
||
|
|
global.File = klass
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (blobSupported) {
|
||
|
|
fixFileAndXHR()
|
||
|
|
global.Blob = blobSupportsArrayBufferView ? global.Blob : BlobConstructor
|
||
|
|
} else if (blobBuilderSupported) {
|
||
|
|
fixFileAndXHR()
|
||
|
|
global.Blob = BlobBuilderConstructor
|
||
|
|
} else {
|
||
|
|
FakeBlobBuilder()
|
||
|
|
}
|
||
|
|
|
||
|
|
if (strTag) {
|
||
|
|
File.prototype[strTag] = 'File'
|
||
|
|
Blob.prototype[strTag] = 'Blob'
|
||
|
|
FileReader.prototype[strTag] = 'FileReader'
|
||
|
|
}
|
||
|
|
|
||
|
|
var blob = global.Blob.prototype
|
||
|
|
var stream
|
||
|
|
|
||
|
|
function promisify(obj) {
|
||
|
|
return new Promise(function(resolve, reject) {
|
||
|
|
obj.onload =
|
||
|
|
obj.onerror = function(evt) {
|
||
|
|
obj.onload =
|
||
|
|
obj.onerror = null
|
||
|
|
|
||
|
|
evt.type === 'load'
|
||
|
|
? resolve(obj.result || obj)
|
||
|
|
: reject(new Error('Failed to read the blob/file'))
|
||
|
|
}
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
try {
|
||
|
|
new ReadableStream({ type: 'bytes' })
|
||
|
|
stream = function stream() {
|
||
|
|
var position = 0
|
||
|
|
var blob = this
|
||
|
|
|
||
|
|
return new ReadableStream({
|
||
|
|
type: 'bytes',
|
||
|
|
autoAllocateChunkSize: 524288,
|
||
|
|
|
||
|
|
pull: function (controller) {
|
||
|
|
var v = controller.byobRequest.view
|
||
|
|
var chunk = blob.slice(position, position + v.byteLength)
|
||
|
|
return chunk.arrayBuffer()
|
||
|
|
.then(function (buffer) {
|
||
|
|
var uint8array = new Uint8Array(buffer)
|
||
|
|
var bytesRead = uint8array.byteLength
|
||
|
|
|
||
|
|
position += bytesRead
|
||
|
|
v.set(uint8array)
|
||
|
|
controller.byobRequest.respond(bytesRead)
|
||
|
|
|
||
|
|
if(position >= blob.size)
|
||
|
|
controller.close()
|
||
|
|
})
|
||
|
|
}
|
||
|
|
})
|
||
|
|
}
|
||
|
|
} catch (e) {
|
||
|
|
try {
|
||
|
|
new ReadableStream({})
|
||
|
|
stream = function stream(blob){
|
||
|
|
var position = 0
|
||
|
|
var blob = this
|
||
|
|
|
||
|
|
return new ReadableStream({
|
||
|
|
pull: function (controller) {
|
||
|
|
var chunk = blob.slice(position, position + 524288)
|
||
|
|
|
||
|
|
return chunk.arrayBuffer().then(function (buffer) {
|
||
|
|
position += buffer.byteLength
|
||
|
|
var uint8array = new Uint8Array(buffer)
|
||
|
|
controller.enqueue(uint8array)
|
||
|
|
|
||
|
|
if (position == blob.size)
|
||
|
|
controller.close()
|
||
|
|
})
|
||
|
|
}
|
||
|
|
})
|
||
|
|
}
|
||
|
|
} catch (e) {
|
||
|
|
try {
|
||
|
|
new Response('').body.getReader().read()
|
||
|
|
stream = function stream() {
|
||
|
|
return (new Response(this)).body
|
||
|
|
}
|
||
|
|
} catch (e) {
|
||
|
|
stream = function stream() {
|
||
|
|
throw new Error('Include https://github.com/MattiasBuelens/web-streams-polyfill')
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
if (!blob.arrayBuffer) {
|
||
|
|
blob.arrayBuffer = function arrayBuffer() {
|
||
|
|
var fr = new FileReader()
|
||
|
|
fr.readAsArrayBuffer(this)
|
||
|
|
return promisify(fr)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!blob.text) {
|
||
|
|
blob.text = function text() {
|
||
|
|
var fr = new FileReader()
|
||
|
|
fr.readAsText(this)
|
||
|
|
return promisify(fr)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!blob.stream) {
|
||
|
|
blob.stream = stream
|
||
|
|
}
|
||
|
|
})();
|
||
|
|
|
||
|
|
/* canvas-toBlob.js
|
||
|
|
* A canvas.toBlob() implementation.
|
||
|
|
* 2016-05-26
|
||
|
|
*
|
||
|
|
* By Eli Grey, http://eligrey.com and Devin Samarin, https://github.com/eboyjr
|
||
|
|
* License: MIT
|
||
|
|
* See https://github.com/eligrey/canvas-toBlob.js/blob/master/LICENSE.md
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*global self */
|
||
|
|
/*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true,
|
||
|
|
plusplus: true */
|
||
|
|
|
||
|
|
/*! @source http://purl.eligrey.com/github/canvas-toBlob.js/blob/master/canvas-toBlob.js */
|
||
|
|
|
||
|
|
(function(view) {
|
||
|
|
"use strict";
|
||
|
|
var
|
||
|
|
Uint8Array = view.Uint8Array
|
||
|
|
, HTMLCanvasElement = view.HTMLCanvasElement
|
||
|
|
, canvas_proto = HTMLCanvasElement && HTMLCanvasElement.prototype
|
||
|
|
, is_base64_regex = /\s*;\s*base64\s*(?:;|$)/i
|
||
|
|
, to_data_url = "toDataURL"
|
||
|
|
, base64_ranks
|
||
|
|
, decode_base64 = function(base64) {
|
||
|
|
var
|
||
|
|
len = base64.length
|
||
|
|
, buffer = new Uint8Array(len / 4 * 3 | 0)
|
||
|
|
, i = 0
|
||
|
|
, outptr = 0
|
||
|
|
, last = [0, 0]
|
||
|
|
, state = 0
|
||
|
|
, save = 0
|
||
|
|
, rank
|
||
|
|
, code
|
||
|
|
, undef
|
||
|
|
;
|
||
|
|
while (len--) {
|
||
|
|
code = base64.charCodeAt(i++);
|
||
|
|
rank = base64_ranks[code-43];
|
||
|
|
if (rank !== 255 && rank !== undef) {
|
||
|
|
last[1] = last[0];
|
||
|
|
last[0] = code;
|
||
|
|
save = (save << 6) | rank;
|
||
|
|
state++;
|
||
|
|
if (state === 4) {
|
||
|
|
buffer[outptr++] = save >>> 16;
|
||
|
|
if (last[1] !== 61 /* padding character */) {
|
||
|
|
buffer[outptr++] = save >>> 8;
|
||
|
|
}
|
||
|
|
if (last[0] !== 61 /* padding character */) {
|
||
|
|
buffer[outptr++] = save;
|
||
|
|
}
|
||
|
|
state = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
// 2/3 chance there's going to be some null bytes at the end, but that
|
||
|
|
// doesn't really matter with most image formats.
|
||
|
|
// If it somehow matters for you, truncate the buffer up outptr.
|
||
|
|
return buffer;
|
||
|
|
}
|
||
|
|
;
|
||
|
|
if (Uint8Array) {
|
||
|
|
base64_ranks = new Uint8Array([
|
||
|
|
62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1
|
||
|
|
, -1, -1, 0, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
|
||
|
|
, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25
|
||
|
|
, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35
|
||
|
|
, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51
|
||
|
|
]);
|
||
|
|
}
|
||
|
|
if (HTMLCanvasElement && (!canvas_proto.toBlob || !canvas_proto.toBlobHD)) {
|
||
|
|
if (!canvas_proto.toBlob)
|
||
|
|
canvas_proto.toBlob = function(callback, type /*, ...args*/) {
|
||
|
|
if (!type) {
|
||
|
|
type = "image/png";
|
||
|
|
} if (this.mozGetAsFile) {
|
||
|
|
callback(this.mozGetAsFile("canvas", type));
|
||
|
|
return;
|
||
|
|
} if (this.msToBlob && /^\s*image\/png\s*(?:$|;)/i.test(type)) {
|
||
|
|
callback(this.msToBlob());
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
var
|
||
|
|
args = Array.prototype.slice.call(arguments, 1)
|
||
|
|
, dataURI = this[to_data_url].apply(this, args)
|
||
|
|
, header_end = dataURI.indexOf(",")
|
||
|
|
, data = dataURI.substring(header_end + 1)
|
||
|
|
, is_base64 = is_base64_regex.test(dataURI.substring(0, header_end))
|
||
|
|
, blob
|
||
|
|
;
|
||
|
|
if (Blob.fake) {
|
||
|
|
// no reason to decode a data: URI that's just going to become a data URI again
|
||
|
|
blob = new Blob
|
||
|
|
if (is_base64) {
|
||
|
|
blob.encoding = "base64";
|
||
|
|
} else {
|
||
|
|
blob.encoding = "URI";
|
||
|
|
}
|
||
|
|
blob.data = data;
|
||
|
|
blob.size = data.length;
|
||
|
|
} else if (Uint8Array) {
|
||
|
|
if (is_base64) {
|
||
|
|
blob = new Blob([decode_base64(data)], {type: type});
|
||
|
|
} else {
|
||
|
|
blob = new Blob([decodeURIComponent(data)], {type: type});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
callback(blob);
|
||
|
|
};
|
||
|
|
|
||
|
|
if (!canvas_proto.toBlobHD && canvas_proto.toDataURLHD) {
|
||
|
|
canvas_proto.toBlobHD = function() {
|
||
|
|
to_data_url = "toDataURLHD";
|
||
|
|
var blob = this.toBlob();
|
||
|
|
to_data_url = "toDataURL";
|
||
|
|
return blob;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
canvas_proto.toBlobHD = canvas_proto.toBlob;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}(typeof self !== "undefined" && self || typeof window !== "undefined" && window || this.content || this));
|