func (dp *packedObjectParser) parseTree(size int64) *PackedObject {
dp.hdr = objects.NewObjectHeader(objects.ObjectTree, size)
tree := dp.objectParser.parseTree()
return &PackedObject{
object: tree,
bytes: dp.bytes,
}
}
func (dp *packedObjectParser) parseTag(size int64) *PackedObject {
dp.hdr = objects.NewObjectHeader(objects.ObjectTag, size)
tag := dp.objectParser.parseTag()
return &PackedObject{
object: tag,
bytes: dp.bytes,
}
}
func (dp *packedObjectParser) parseCommit(size int64) *PackedObject {
dp.hdr = objects.NewObjectHeader(objects.ObjectCommit, size)
commit := dp.objectParser.parseCommit()
return &PackedObject{
object: commit,
bytes: dp.bytes,
}
}
func (dp *packedObjectParser) parseBlob(size int64) *PackedObject {
data := dp.Bytes()
oid := dp.objectParser.oid
hdr := objects.NewObjectHeader(objects.ObjectBlob, size)
blob := objects.NewBlob(oid, hdr, data)
return &PackedObject{
object: blob,
bytes: data,
}
}
func (dp *packedObjectParser) applyDelta(base *PackedObject, id *objects.ObjectId) (object *PackedObject) {
p := dp.objectParser
baseSize := p.parseIntWhileMSB()
outputSize := p.parseIntWhileMSB()
src := base.bytes
if int(baseSize) != len(src) {
util.PanicErrf("Expected size of base object is %d, but actual size is %d")
}
out := make([]byte, outputSize, outputSize)
var appended int64
cmd := p.ReadByte()
for {
if cmd == 0 {
util.PanicErrf("Invalid delta! Byte 0 is not a supported delta code.")
}
var offset, len int64
if cmd&0x80 != 0 {
//copy from base to output
offset, len = dp.parseCopyCmd(cmd)
for i := offset; i < offset+len; i++ {
out[appended+(i-offset)] = src[i]
}
if offset+len > baseSize {
util.PanicErrf("Bad delta - references byte %d of a %d-byte source", offset+len, baseSize)
break
}
} else {
//copy from delta to output
offset, len = 0, int64(cmd)
for i := offset; i < offset+len; i++ {
out[appended+(i-offset)] = p.ReadByte()
}
}
appended += len
if appended < outputSize {
cmd = p.ReadByte()
} else {
break
}
}
if appended != outputSize {
util.PanicErrf("Expected output of size %d, got %d. \n", outputSize, appended)
}
if outputSize != int64(len(out)) {
util.PanicErrf("Expected output of len %d, got %d. \n", outputSize, len(out))
}
outputType := base.object.Header().Type()
outputParser := NewObjectParser(bufio.NewReader(bytes.NewReader(out)), id)
outputParser.hdr = objects.NewObjectHeader(outputType, outputSize)
var obj objects.Object
switch outputType {
case objects.ObjectBlob:
obj = outputParser.parseBlob()
case objects.ObjectTree:
obj = outputParser.parseTree()
case objects.ObjectCommit:
obj = outputParser.parseCommit()
case objects.ObjectTag:
obj = outputParser.parseTag()
}
return &PackedObject{
obj,
out,
base.object.ObjectId(),
base.Depth + 1,
}
}
