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Trimmed vtables of trailing zeroes.

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This is something the format supports, but none of the builders
were doing. Can save 10-20% on FlatBuffer binary size!

Also fixed the Go tests.

Change-Id: I616c56ce9bbcfcaee23aa24f0532fcb60b6a8c75
Tested: on Linux.
This commit is contained in:
Wouter van Oortmerssen
2017-08-21 13:44:23 -07:00
parent 513958ea72
commit ac1015e3c4
25 changed files with 129 additions and 62 deletions
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10
net/FlatBuffers/FlatBufferBuilder.cs
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@@ -500,7 +500,11 @@ namespace FlatBuffers
AddInt((int)0);
var vtableloc = Offset;
// Write out the current vtable.
for (int i = _vtableSize - 1; i >= 0 ; i--) {
int i = _vtableSize - 1;
// Trim trailing zeroes.
for (; i >= 0 && _vtable[i] == 0; i--) {}
int trimmedSize = i + 1;
for (; i >= 0 ; i--) {
// Offset relative to the start of the table.
short off = (short)(_vtable[i] != 0
? vtableloc - _vtable[i]
@@ -513,12 +517,12 @@ namespace FlatBuffers
const int standardFields = 2; // The fields below:
AddShort((short)(vtableloc - _objectStart));
AddShort((short)((_vtableSize + standardFields) *
AddShort((short)((trimmedSize + standardFields) *
sizeof(short)));
// Search for an existing vtable that matches the current one.
int existingVtable = 0;
for (int i = 0; i < _numVtables; i++) {
for (i = 0; i < _numVtables; i++) {
int vt1 = _bb.Length - _vtables[i];
int vt2 = _space;
short len = _bb.GetShort(vt1);