mirror of
https://github.com/OpenDiablo2/OpenDiablo2
synced 2024-09-06 11:34:15 -04:00
79 lines
1.9 KiB
Go
79 lines
1.9 KiB
Go
package d2dcc
|
|
|
|
import (
|
|
"errors"
|
|
|
|
"github.com/OpenDiablo2/OpenDiablo2/d2common/d2datautils"
|
|
)
|
|
|
|
const dccFileSignature = 0x74
|
|
const directionOffsetMultiplier = 8
|
|
|
|
// DCC represents a DCC file.
|
|
type DCC struct {
|
|
Signature int
|
|
Version int
|
|
NumberOfDirections int
|
|
FramesPerDirection int
|
|
Directions []*DCCDirection
|
|
directionOffsets []int
|
|
fileData []byte
|
|
}
|
|
|
|
// Load loads a DCC file.
|
|
func Load(fileData []byte) (*DCC, error) {
|
|
result := &DCC{
|
|
fileData: fileData,
|
|
}
|
|
|
|
var bm = d2datautils.CreateBitMuncher(fileData, 0)
|
|
|
|
result.Signature = int(bm.GetByte())
|
|
|
|
if result.Signature != dccFileSignature {
|
|
return nil, errors.New("signature expected to be 0x74 but it is not")
|
|
}
|
|
|
|
result.Version = int(bm.GetByte())
|
|
result.NumberOfDirections = int(bm.GetByte())
|
|
result.FramesPerDirection = int(bm.GetInt32())
|
|
|
|
result.Directions = make([]*DCCDirection, result.NumberOfDirections)
|
|
|
|
if bm.GetInt32() != 1 {
|
|
return nil, errors.New("this value isn't 1. It has to be 1")
|
|
}
|
|
|
|
bm.GetInt32() // TotalSizeCoded
|
|
|
|
result.directionOffsets = make([]int, result.NumberOfDirections)
|
|
|
|
for i := 0; i < result.NumberOfDirections; i++ {
|
|
result.directionOffsets[i] = int(bm.GetInt32())
|
|
result.Directions[i] = result.decodeDirection(i)
|
|
}
|
|
|
|
return result, nil
|
|
}
|
|
|
|
// decodeDirection decodes and returns the given direction
|
|
func (d *DCC) decodeDirection(direction int) *DCCDirection {
|
|
return CreateDCCDirection(d2datautils.CreateBitMuncher(d.fileData,
|
|
d.directionOffsets[direction]*directionOffsetMultiplier), d)
|
|
}
|
|
|
|
// Clone creates a copy of the DCC
|
|
func (d *DCC) Clone() *DCC {
|
|
clone := *d
|
|
copy(clone.directionOffsets, d.directionOffsets)
|
|
copy(clone.fileData, d.fileData)
|
|
clone.Directions = make([]*DCCDirection, len(d.Directions))
|
|
|
|
for i := range d.Directions {
|
|
cloneDirection := *d.Directions[i]
|
|
clone.Directions = append(clone.Directions, &cloneDirection)
|
|
}
|
|
|
|
return &clone
|
|
}
|