/
metaData.go
68 lines (56 loc) · 1.27 KB
/
metaData.go
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package MD
import (
"encoding/binary"
"fmt"
"io"
"os"
"github.com/LincolnG4/GoMDF/internal/blocks"
"github.com/LincolnG4/GoMDF/internal/blocks/TX"
)
type Block struct {
Header blocks.Header
Data []byte
}
func New(file *os.File, startAdress int64) string {
var blockSize uint64 = blocks.HeaderSize
var b Block
_, errs := file.Seek(startAdress, 0)
if errs != nil {
if errs != io.EOF {
fmt.Println(errs, "Memory Addr out of size")
}
}
b.Header = blocks.Header{}
//Create a buffer based on blocksize
buf := blocks.LoadBuffer(file, blockSize)
//Read header
BinaryError := binary.Read(buf, binary.LittleEndian, &b.Header)
if BinaryError != nil {
fmt.Println("error", BinaryError)
b.BlankBlock()
}
//If block is ##MD
if string(b.Header.ID[:]) == blocks.MdID {
blockSize = blocks.CalculateDataSize(b.Header.Length, b.Header.LinkCount)
buf := make([]byte, blockSize)
b.Data = blocks.GetText(file, startAdress, buf, true)
r := string(b.Data)
return r
}
t, err := TX.GetText(file, startAdress)
if err != nil {
return ""
}
return t
}
func (b *Block) BlankBlock() *Block {
return &Block{
Header: blocks.Header{
ID: [4]byte{'#', '#', 'M', 'D'},
Reserved: [4]byte{},
Length: 64,
LinkCount: 4,
},
Data: []byte{},
}
}