func decomp(decomp_buf, block *Block, in, out DuplexPipe, wg *sync.WaitGroup) {
defer wg.Done()
nBlocks := (in.FileSize / int64(in.BlockSize)) + 1
if block.BlockID < int(nBlocks)-1 {
snappy.Decode(decomp_buf.Buf, block.Buf[:block.NBytes])
decomp_buf.BlockID = block.BlockID
} else {
decomp_buf.NBytes = block.NBytes
decomp_buf.BlockID = block.BlockID
copy(decomp_buf.Buf[:decomp_buf.NBytes], block.Buf)
}
in.Upstream <- block
out.Downstream <- decomp_buf
}
func main() {
// open input file
dataFile, err := os.Open(os.Args[1])
if err != nil {
panic(err)
}
defer func() {
if err := dataFile.Close(); err != nil {
panic(err)
}
}()
// open uncompressed file
outFile, err := os.Create(os.Args[1] + ".ini")
if err != nil {
panic(err)
}
defer func() {
if err := outFile.Close(); err != nil {
panic(err)
}
}()
f32s := make([]byte, 4)
bytes := make([]byte, 1)
dataFile.Seek(3, 0)
dataFile.Read(bytes)
type_size := int(bytes[0])
dataFile.Seek(8, 0)
dataFile.Read(f32s)
file_size := binary.LittleEndian.Uint32(f32s)
dataFile.Seek(12, 0)
dataFile.Read(f32s)
block_size := binary.LittleEndian.Uint32(f32s) * kB
nBlocks := (file_size / (block_size)) + 1
offsets := make([]byte, nBlocks*8)
dataFile.Seek(20, 0)
dataFile.Read(offsets)
dbuf := make([]byte, block_size)
for i := uint32(0); i < nBlocks-1; i++ {
start := binary.LittleEndian.Uint32(offsets[i*8 : (i*8)+4])
size := binary.LittleEndian.Uint32(offsets[i*8+4 : (i*8)+8])
block := make([]byte, size)
dataFile.Seek(int64(start), 0)
dataFile.Read(block)
d, _ := snappy.Decode(dbuf, block[:])
bufo := make([]byte, len(d))
for j := 0; j < type_size; j++ {
for k := 0; k < int(block_size)/64; k++ {
bufo[k*type_size+j] = d[k+(j*int(block_size)/type_size)]
}
}
outFile.Write(bufo)
}
start := binary.LittleEndian.Uint32(offsets[(nBlocks-1)*8 : ((nBlocks-1)*8)+4])
size := binary.LittleEndian.Uint32(offsets[(nBlocks-1)*8+4 : ((nBlocks-1)*8)+8])
block := make([]byte, size)
dataFile.Seek(int64(start), 0)
dataFile.Read(block)
outFile.Write(block)
}
