Publish Vulpes Preview 15 sources for desktop, Android and Tundra
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
This commit is contained in:
OverSu
parent
93e3a48004
commit
b38dea0597
25901 changed files with 9982925 additions and 369 deletions
430
gaia/shared/js/blobview.js
Executable file
430
gaia/shared/js/blobview.js
Executable file
|
|
@ -0,0 +1,430 @@
|
|||
/* exported BlobView */
|
||||
'use strict';
|
||||
|
||||
var BlobView = (function() {
|
||||
function fail(msg) {
|
||||
throw Error(msg);
|
||||
}
|
||||
|
||||
var decoderCache = {};
|
||||
function getDecoder(encoding) {
|
||||
if (encoding in decoderCache) {
|
||||
return decoderCache[encoding];
|
||||
}
|
||||
var decoder = decoderCache[encoding] = new TextDecoder(encoding);
|
||||
return decoder;
|
||||
}
|
||||
|
||||
// This constructor is for internal use only.
|
||||
// Use the BlobView.get() factory function or the getMore instance method
|
||||
// to obtain a BlobView object.
|
||||
function BlobView(blob, sliceOffset, sliceLength, slice,
|
||||
viewOffset, viewLength, littleEndian)
|
||||
{
|
||||
this.blob = blob; // The parent blob that the data is from
|
||||
this.sliceOffset = sliceOffset; // The start address within the blob
|
||||
this.sliceLength = sliceLength; // How long the slice is
|
||||
this.slice = slice; // The ArrayBuffer of slice data
|
||||
this.viewOffset = viewOffset; // The start of the view within the slice
|
||||
this.viewLength = viewLength; // The length of the view
|
||||
this.littleEndian = littleEndian; // Read little endian by default?
|
||||
|
||||
// DataView wrapper around the ArrayBuffer
|
||||
this.view = new DataView(slice, viewOffset, viewLength);
|
||||
|
||||
// These fields mirror those of DataView
|
||||
this.buffer = slice;
|
||||
this.byteLength = viewLength;
|
||||
this.byteOffset = viewOffset;
|
||||
|
||||
this.index = 0; // The read methods keep track of the read position
|
||||
}
|
||||
|
||||
// Async factory function
|
||||
BlobView.get = function(blob, offset, length, callback, littleEndian) {
|
||||
if (offset < 0) {
|
||||
fail('negative offset');
|
||||
}
|
||||
if (length < 0) {
|
||||
fail('negative length');
|
||||
}
|
||||
if (offset > blob.size) {
|
||||
fail('offset larger than blob size');
|
||||
}
|
||||
// Don't fail if the length is too big; just reduce the length
|
||||
if (offset + length > blob.size) {
|
||||
length = blob.size - offset;
|
||||
}
|
||||
var slice = blob.slice(offset, offset + length);
|
||||
var reader = new FileReader();
|
||||
reader.readAsArrayBuffer(slice);
|
||||
reader.onloadend = function() {
|
||||
var result = null;
|
||||
if (reader.result) {
|
||||
result = new BlobView(blob, offset, length, reader.result,
|
||||
0, length, littleEndian || false);
|
||||
}
|
||||
callback(result, reader.error);
|
||||
};
|
||||
};
|
||||
|
||||
// Synchronous factory function for use when you have an array buffer and want
|
||||
// to treat it as a BlobView (e.g. to use the readXYZ functions). We need
|
||||
// this for the music app, which uses an array buffer to hold
|
||||
// de-unsynchronized ID3 frames.
|
||||
BlobView.getFromArrayBuffer = function(buffer, offset, length, littleEndian) {
|
||||
return new BlobView(null, offset, length, buffer, offset, length,
|
||||
littleEndian);
|
||||
};
|
||||
|
||||
BlobView.prototype = {
|
||||
constructor: BlobView,
|
||||
|
||||
// This instance method is like the BlobView.get() factory method,
|
||||
// but it is here because if the current buffer includes the requested
|
||||
// range of bytes, they can be passed directly to the callback without
|
||||
// going back to the blob to read them
|
||||
getMore: function(offset, length, callback) {
|
||||
// If we made this BlobView from an array buffer, there's no blob backing
|
||||
// it, and so it's impossible to get more data.
|
||||
if (!this.blob) {
|
||||
fail('no blob backing this BlobView');
|
||||
}
|
||||
|
||||
if (offset >= this.sliceOffset &&
|
||||
offset + length <= this.sliceOffset + this.sliceLength) {
|
||||
// The quick case: we already have that region of the blob
|
||||
callback(new BlobView(this.blob,
|
||||
this.sliceOffset, this.sliceLength, this.slice,
|
||||
offset - this.sliceOffset, length,
|
||||
this.littleEndian));
|
||||
}
|
||||
else {
|
||||
// Otherwise, we have to do an async read to get more bytes
|
||||
BlobView.get(this.blob, offset, length, callback, this.littleEndian);
|
||||
}
|
||||
},
|
||||
|
||||
// Set the default endianness for the other methods
|
||||
littleEndian: function() {
|
||||
this.littleEndian = true;
|
||||
},
|
||||
bigEndian: function() {
|
||||
this.littleEndian = false;
|
||||
},
|
||||
|
||||
// These "get" methods are just copies of the DataView methods, except
|
||||
// that they honor the default endianness
|
||||
getUint8: function(offset) {
|
||||
return this.view.getUint8(offset);
|
||||
},
|
||||
getInt8: function(offset) {
|
||||
return this.view.getInt8(offset);
|
||||
},
|
||||
getUint16: function(offset, le) {
|
||||
return this.view.getUint16(offset,
|
||||
le !== undefined ? le : this.littleEndian);
|
||||
},
|
||||
getInt16: function(offset, le) {
|
||||
return this.view.getInt16(offset,
|
||||
le !== undefined ? le : this.littleEndian);
|
||||
},
|
||||
getUint32: function(offset, le) {
|
||||
return this.view.getUint32(offset,
|
||||
le !== undefined ? le : this.littleEndian);
|
||||
},
|
||||
getInt32: function(offset, le) {
|
||||
return this.view.getInt32(offset,
|
||||
le !== undefined ? le : this.littleEndian);
|
||||
},
|
||||
getFloat32: function(offset, le) {
|
||||
return this.view.getFloat32(offset,
|
||||
le !== undefined ? le : this.littleEndian);
|
||||
},
|
||||
getFloat64: function(offset, le) {
|
||||
return this.view.getFloat64(offset,
|
||||
le !== undefined ? le : this.littleEndian);
|
||||
},
|
||||
|
||||
// These "read" methods read from the current position in the view and
|
||||
// update that position accordingly
|
||||
readByte: function() {
|
||||
return this.view.getInt8(this.index++);
|
||||
},
|
||||
readUnsignedByte: function() {
|
||||
return this.view.getUint8(this.index++);
|
||||
},
|
||||
readShort: function(le) {
|
||||
var val = this.view.getInt16(this.index,
|
||||
le !== undefined ? le : this.littleEndian);
|
||||
this.index += 2;
|
||||
return val;
|
||||
},
|
||||
readUnsignedShort: function(le) {
|
||||
var val = this.view.getUint16(this.index,
|
||||
le !== undefined ? le : this.littleEndian);
|
||||
this.index += 2;
|
||||
return val;
|
||||
},
|
||||
readInt: function(le) {
|
||||
var val = this.view.getInt32(this.index,
|
||||
le !== undefined ? le : this.littleEndian);
|
||||
this.index += 4;
|
||||
return val;
|
||||
},
|
||||
readUnsignedInt: function(le) {
|
||||
var val = this.view.getUint32(this.index,
|
||||
le !== undefined ? le : this.littleEndian);
|
||||
this.index += 4;
|
||||
return val;
|
||||
},
|
||||
readFloat: function(le) {
|
||||
var val = this.view.getFloat32(this.index,
|
||||
le !== undefined ? le : this.littleEndian);
|
||||
this.index += 4;
|
||||
return val;
|
||||
},
|
||||
readDouble: function(le) {
|
||||
var val = this.view.getFloat64(this.index,
|
||||
le !== undefined ? le : this.littleEndian);
|
||||
this.index += 8;
|
||||
return val;
|
||||
},
|
||||
|
||||
// Methods to get and set the current position
|
||||
tell: function() {
|
||||
return this.index;
|
||||
},
|
||||
remaining: function() {
|
||||
return this.byteLength - this.index;
|
||||
},
|
||||
seek: function(index) {
|
||||
if (index < 0) {
|
||||
fail('negative index');
|
||||
}
|
||||
if (index > this.byteLength) {
|
||||
fail('index greater than buffer size');
|
||||
}
|
||||
this.index = index;
|
||||
},
|
||||
advance: function(n) {
|
||||
var index = this.index + n;
|
||||
if (index < 0) {
|
||||
fail('advance past beginning of buffer');
|
||||
}
|
||||
// It's usual that when we finished reading one target view,
|
||||
// the index is advanced to the start(previous end + 1) of next view,
|
||||
// and the new index will be equal to byte length(the last index + 1),
|
||||
// we will not fail on it because it means the reading is finished,
|
||||
// or do we have to warn here?
|
||||
if (index > this.byteLength) {
|
||||
fail('advance past end of buffer');
|
||||
}
|
||||
this.index = index;
|
||||
},
|
||||
|
||||
// Additional methods to read other useful things
|
||||
getUnsignedByteArray: function(offset, n) {
|
||||
return new Uint8Array(this.buffer, offset + this.viewOffset, n);
|
||||
},
|
||||
|
||||
// Additional methods to read other useful things
|
||||
readUnsignedByteArray: function(n) {
|
||||
var val = new Uint8Array(this.buffer, this.index + this.viewOffset, n);
|
||||
this.index += n;
|
||||
return val;
|
||||
},
|
||||
|
||||
getBit: function(offset, bit) {
|
||||
var byte = this.view.getUint8(offset);
|
||||
return (byte & (1 << bit)) !== 0;
|
||||
},
|
||||
|
||||
getUint24: function(offset, le) {
|
||||
var b1, b2, b3;
|
||||
if (le !== undefined ? le : this.littleEndian) {
|
||||
b1 = this.view.getUint8(offset);
|
||||
b2 = this.view.getUint8(offset + 1);
|
||||
b3 = this.view.getUint8(offset + 2);
|
||||
}
|
||||
else { // big end first
|
||||
b3 = this.view.getUint8(offset);
|
||||
b2 = this.view.getUint8(offset + 1);
|
||||
b1 = this.view.getUint8(offset + 2);
|
||||
}
|
||||
|
||||
return (b3 << 16) + (b2 << 8) + b1;
|
||||
},
|
||||
|
||||
readUint24: function(le) {
|
||||
var value = this.getUint24(this.index, le);
|
||||
this.index += 3;
|
||||
return value;
|
||||
},
|
||||
|
||||
// There are lots of ways to read strings. We support binary (raw 8-bit
|
||||
// codepoints), Latin-1, UTF-8, and UTF-16. For the latter three, we also
|
||||
// support null-terminated versions.
|
||||
|
||||
getBinaryText: function(offset, len) {
|
||||
var bytes = new Uint8Array(this.buffer, offset + this.viewOffset, len);
|
||||
return String.fromCharCode.apply(String, bytes);
|
||||
},
|
||||
|
||||
readBinaryText: function(len) {
|
||||
var s = this.getBinaryText(this.index, len);
|
||||
this.index += len;
|
||||
return s;
|
||||
},
|
||||
|
||||
getLatin1Text: function(offset, len) {
|
||||
var bytes = new Uint8Array(this.buffer, offset + this.viewOffset, len);
|
||||
return getDecoder('latin1').decode(bytes);
|
||||
},
|
||||
|
||||
readLatin1Text: function(len) {
|
||||
var s = this.getLatin1Text(this.index, len);
|
||||
this.index += len;
|
||||
return s;
|
||||
},
|
||||
|
||||
getUTF8Text: function(offset, len) {
|
||||
var bytes = new Uint8Array(this.buffer, offset + this.viewOffset, len);
|
||||
return getDecoder('utf-8').decode(bytes);
|
||||
},
|
||||
|
||||
readUTF8Text: function(len) {
|
||||
var s = this.getUTF8Text(this.index, len);
|
||||
this.index += len;
|
||||
return s;
|
||||
},
|
||||
|
||||
// Get UTF16 text. If le is not specified, expect a BOM to define
|
||||
// endianness. If le is true, read UTF16LE, if false, UTF16BE.
|
||||
getUTF16Text: function(offset, len, le) {
|
||||
if (len % 2) {
|
||||
fail('len must be a multiple of two');
|
||||
}
|
||||
|
||||
var bytes = new Uint8Array(this.buffer, offset + this.viewOffset, len);
|
||||
|
||||
if (le === null || le === undefined) {
|
||||
var BOM = (bytes[0] << 8) + bytes[1];
|
||||
|
||||
if (BOM === 0xFEFF) {
|
||||
bytes = bytes.subarray(2);
|
||||
le = false;
|
||||
} else if (BOM === 0xFFFE) {
|
||||
bytes = bytes.subarray(2);
|
||||
le = true;
|
||||
} else {
|
||||
le = true;
|
||||
}
|
||||
}
|
||||
|
||||
var encoding = le ? 'utf-16le' : 'utf-16be';
|
||||
return getDecoder(encoding).decode(bytes);
|
||||
},
|
||||
|
||||
readUTF16Text: function(len, le) {
|
||||
var s = this.getUTF16Text(this.index, len, le);
|
||||
this.index += len;
|
||||
return s;
|
||||
},
|
||||
|
||||
// Read 4 bytes, ignore the high bit and combine them into a 28-bit
|
||||
// big-endian unsigned integer.
|
||||
// This format is used by the ID3v2 metadata.
|
||||
getID3Uint28BE: function(offset) {
|
||||
var b1 = this.view.getUint8(offset) & 0x7f;
|
||||
var b2 = this.view.getUint8(offset + 1) & 0x7f;
|
||||
var b3 = this.view.getUint8(offset + 2) & 0x7f;
|
||||
var b4 = this.view.getUint8(offset + 3) & 0x7f;
|
||||
return (b1 << 21) | (b2 << 14) | (b3 << 7) | b4;
|
||||
},
|
||||
|
||||
readID3Uint28BE: function() {
|
||||
var value = this.getID3Uint28BE(this.index);
|
||||
this.index += 4;
|
||||
return value;
|
||||
},
|
||||
|
||||
// Read bytes up to and including a null terminator, but never
|
||||
// more than size bytes. And return as a Latin1 string. If advance_by_size
|
||||
// is true, this will always seek ahead by `size` bytes, even if a null
|
||||
// character was found earlier.
|
||||
readNullTerminatedLatin1Text: function(size, advance_by_size = false) {
|
||||
var bytes = new Uint8Array(this.buffer, this.viewOffset + this.index,
|
||||
size);
|
||||
|
||||
var nil = bytes.indexOf(0);
|
||||
if (nil !== -1) {
|
||||
bytes = bytes.subarray(0, nil);
|
||||
}
|
||||
|
||||
var s = getDecoder('latin1').decode(bytes);
|
||||
if (nil === -1 || advance_by_size) {
|
||||
this.index += size;
|
||||
} else {
|
||||
this.index += nil + 1;
|
||||
}
|
||||
return s;
|
||||
},
|
||||
|
||||
// Read bytes up to and including a null terminator, but never
|
||||
// more than size bytes. And return as a UTF8 string. If advance_by_size
|
||||
// is true, this will always seek ahead by `size` bytes, even if a null
|
||||
// character was found earlier.
|
||||
readNullTerminatedUTF8Text: function(size, advance_by_size = false) {
|
||||
var bytes = new Uint8Array(this.buffer, this.viewOffset + this.index,
|
||||
size);
|
||||
|
||||
var nil = bytes.indexOf(0);
|
||||
if (nil !== -1) {
|
||||
bytes = bytes.subarray(0, nil);
|
||||
}
|
||||
|
||||
var s = getDecoder('utf-8').decode(bytes);
|
||||
if (nil === -1 || advance_by_size) {
|
||||
this.index += size;
|
||||
} else {
|
||||
this.index += nil + 1;
|
||||
}
|
||||
return s;
|
||||
},
|
||||
|
||||
// Read UTF16 text. If le is not specified, expect a BOM to define
|
||||
// endianness. If le is true, read UTF16LE, if false, UTF16BE
|
||||
// Read until we find a null-terminator, but never more than size bytes.
|
||||
// If advance_by_size is true, this will always seek ahead by `size` bytes,
|
||||
// even if a null character was found earlier.
|
||||
readNullTerminatedUTF16Text: function(size, le, advance_by_size = false) {
|
||||
if (size % 2) {
|
||||
fail('size must be a multiple of two');
|
||||
}
|
||||
|
||||
for (var len = 0; len < size; len += 2) {
|
||||
if (this.getUint16(this.index + len, le) === 0) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
var s = this.getUTF16Text(this.index, len, le);
|
||||
if (len === size || advance_by_size) {
|
||||
this.index += size;
|
||||
} else {
|
||||
this.index += len + 2;
|
||||
}
|
||||
return s;
|
||||
}
|
||||
};
|
||||
|
||||
// We don't want users of this library to accidentally call the constructor
|
||||
// instead of using one of the factory functions, so we return a dummy object
|
||||
// instead of the real constructor. If someone really needs to get at the
|
||||
// real constructor, the contructor property of the prototype refers to it.
|
||||
return {
|
||||
get: BlobView.get,
|
||||
getFromArrayBuffer: BlobView.getFromArrayBuffer
|
||||
};
|
||||
}());
|
||||
Loading…
Reference in a new issue