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[Lobster] file_identifier support

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Wouter van Oortmerssen
2022-03-08 15:39:12 -08:00
parent 777e78d8dd
commit d648396515
3 changed files with 25 additions and 10 deletions
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21
lobster/flatbuffers.lobster
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@@ -175,25 +175,30 @@ class builder:
while current_vtable.length <= slotnum: current_vtable.push(0)
current_vtable[slotnum] = head
def __Finish(root_table:offset, size_prefix:int):
def __Finish(root_table:offset, size_prefix:int, file_identifier:string?):
// Finish finalizes a buffer, pointing to the given root_table
assert not finished
assert not nested
var prep_size = sz_32
if file_identifier:
prep_size += sz_32
if size_prefix:
prep_size += sz_32
Prep(minalign, prep_size)
if file_identifier:
assert file_identifier.length == 4
buf, head = buf.write_substring_back(head, file_identifier, false)
PrependUOffsetTRelative(root_table)
if size_prefix:
PrependInt32(head)
finished = true
return Start()
def Finish(root_table:offset):
return __Finish(root_table, false)
def Finish(root_table:offset, file_identifier:string? = nil):
return __Finish(root_table, false, file_identifier)
def FinishSizePrefixed(root_table:offset):
return __Finish(root_table, true)
def FinishSizePrefixed(root_table:offset, file_identifier:string? = nil):
return __Finish(root_table, true, file_identifier)
def PrependBool(x):
buf, head = buf.write_int8_le_back(head, x)
@@ -299,3 +304,9 @@ class builder:
// elsewhere.
assert x.o == head
Slot(v)
def has_identifier(buf:string, file_identifier:string):
assert file_identifier.length == 4
return buf.length >= 8 and buf.substring(4, 4) == file_identifier