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Commit Description:
fig bugs in login report
Commit Description:
fig bugs in login report
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node_modules/restructure/src/Pointer.coffee
| 125 lines
| 3.0 KiB
| text/coffeescript
| CoffeeScriptLexer
|
| r789 | utils = require './utils' | |||
| class Pointer | ||||
| constructor: (@offsetType, @type, @options = {}) -> | ||||
| @type = null if @type is 'void' | ||||
| @options.type ?= 'local' | ||||
| @options.allowNull ?= true | ||||
| @options.nullValue ?= 0 | ||||
| @options.lazy ?= false | ||||
| if @options.relativeTo | ||||
| @relativeToGetter = new Function('ctx', "return ctx.#{@options.relativeTo}") | ||||
| decode: (stream, ctx) -> | ||||
| offset = @offsetType.decode(stream, ctx) | ||||
| # handle NULL pointers | ||||
| if offset is @options.nullValue and @options.allowNull | ||||
| return null | ||||
| relative = switch @options.type | ||||
| when 'local' then ctx._startOffset | ||||
| when 'immediate' then stream.pos - @offsetType.size() | ||||
| when 'parent' then ctx.parent._startOffset | ||||
| else | ||||
| c = ctx | ||||
| while c.parent | ||||
| c = c.parent | ||||
| c._startOffset or 0 | ||||
| if @options.relativeTo | ||||
| relative += @relativeToGetter ctx | ||||
| ptr = offset + relative | ||||
| if @type? | ||||
| val = null | ||||
| decodeValue = => | ||||
| return val if val? | ||||
| pos = stream.pos | ||||
| stream.pos = ptr | ||||
| val = @type.decode(stream, ctx) | ||||
| stream.pos = pos | ||||
| return val | ||||
| # If this is a lazy pointer, define a getter to decode only when needed. | ||||
| # This obviously only works when the pointer is contained by a Struct. | ||||
| if @options.lazy | ||||
| return new utils.PropertyDescriptor | ||||
| get: decodeValue | ||||
| return decodeValue() | ||||
| else | ||||
| return ptr | ||||
| size: (val, ctx) -> | ||||
| parent = ctx | ||||
| switch @options.type | ||||
| when 'local', 'immediate' | ||||
| break | ||||
| when 'parent' | ||||
| ctx = ctx.parent | ||||
| else # global | ||||
| while ctx.parent | ||||
| ctx = ctx.parent | ||||
| type = @type | ||||
| unless type? | ||||
| unless val instanceof VoidPointer | ||||
| throw new Error "Must be a VoidPointer" | ||||
| type = val.type | ||||
| val = val.value | ||||
| if val and ctx | ||||
| ctx.pointerSize += type.size(val, parent) | ||||
| return @offsetType.size() | ||||
| encode: (stream, val, ctx) -> | ||||
| parent = ctx | ||||
| if not val? | ||||
| @offsetType.encode(stream, @options.nullValue) | ||||
| return | ||||
| switch @options.type | ||||
| when 'local' | ||||
| relative = ctx.startOffset | ||||
| when 'immediate' | ||||
| relative = stream.pos + @offsetType.size(val, parent) | ||||
| when 'parent' | ||||
| ctx = ctx.parent | ||||
| relative = ctx.startOffset | ||||
| else # global | ||||
| relative = 0 | ||||
| while ctx.parent | ||||
| ctx = ctx.parent | ||||
| if @options.relativeTo | ||||
| relative += @relativeToGetter parent.val | ||||
| @offsetType.encode(stream, ctx.pointerOffset - relative) | ||||
| type = @type | ||||
| unless type? | ||||
| unless val instanceof VoidPointer | ||||
| throw new Error "Must be a VoidPointer" | ||||
| type = val.type | ||||
| val = val.value | ||||
| ctx.pointers.push | ||||
| type: type | ||||
| val: val | ||||
| parent: parent | ||||
| ctx.pointerOffset += type.size(val, parent) | ||||
| # A pointer whose type is determined at decode time | ||||
| class VoidPointer | ||||
| constructor: (@type, @value) -> | ||||
| exports.Pointer = Pointer | ||||
| exports.VoidPointer = VoidPointer | ||||