mirror of
https://github.com/wader/fq.git
synced 2024-12-25 06:12:30 +03:00
407 lines
8.7 KiB
Go
407 lines
8.7 KiB
Go
package interp
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import (
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"bytes"
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"fmt"
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"io"
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"io/fs"
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"io/ioutil"
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"math/big"
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"github.com/wader/fq/internal/aheadreadseeker"
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"github.com/wader/fq/internal/ctxreadseeker"
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"github.com/wader/fq/internal/gojqextra"
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"github.com/wader/fq/internal/ioextra"
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"github.com/wader/fq/internal/progressreadseeker"
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"github.com/wader/fq/pkg/bitio"
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"github.com/wader/fq/pkg/ranges"
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)
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func init() {
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functionRegisterFns = append(functionRegisterFns, func(i *Interp) []Function {
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return []Function{
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{"_tobitsrange", 0, 2, i._toBitsRange, nil},
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{"_is_buffer", 0, 0, i._isBuffer, nil},
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{"open", 0, 0, i._open, nil},
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}
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})
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}
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type ToBuffer interface {
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ToBuffer() (Buffer, error)
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}
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func toBitBuf(v interface{}) (*bitio.Buffer, error) {
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return toBitBufEx(v, false)
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}
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func toBitBufEx(v interface{}, inArray bool) (*bitio.Buffer, error) {
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switch vv := v.(type) {
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case ToBuffer:
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bv, err := vv.ToBuffer()
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if err != nil {
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return nil, err
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}
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return bv.bb.BitBufRange(bv.r.Start, bv.r.Len)
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case string:
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return bitio.NewBufferFromBytes([]byte(vv), -1), nil
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case int, float64, *big.Int:
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bi, err := toBigInt(v)
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if err != nil {
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return nil, err
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}
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if inArray {
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if bi.Cmp(big.NewInt(255)) > 0 || bi.Cmp(big.NewInt(0)) < 0 {
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return nil, fmt.Errorf("buffer byte list must be bytes (0-255) got %v", bi)
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}
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n := bi.Uint64()
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b := [1]byte{byte(n)}
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return bitio.NewBufferFromBytes(b[:], -1), nil
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}
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// TODO: how should this work? "0xf | tobytes" 4bits or 8bits? now 4
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//padBefore := (8 - (bi.BitLen() % 8)) % 8
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padBefore := 0
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bb, err := bitio.NewBufferFromBytes(bi.Bytes(), -1).BitBufRange(int64(padBefore), int64(bi.BitLen()))
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if err != nil {
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return nil, err
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}
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return bb, nil
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case []interface{}:
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var rr []bitio.BitReadAtSeeker
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// TODO: optimize byte array case, flatten into one slice
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for _, e := range vv {
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eBB, eErr := toBitBufEx(e, true)
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if eErr != nil {
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return nil, eErr
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}
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rr = append(rr, eBB)
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}
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mb, err := bitio.NewMultiBitReader(rr)
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if err != nil {
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return nil, err
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}
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bb, err := bitio.NewBufferFromBitReadSeeker(mb)
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if err != nil {
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return nil, err
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}
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return bb, nil
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default:
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return nil, fmt.Errorf("value can't be a buffer")
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}
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}
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func toBuffer(v interface{}) (Buffer, error) {
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switch vv := v.(type) {
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case ToBuffer:
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return vv.ToBuffer()
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default:
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bb, err := toBitBuf(v)
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if err != nil {
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return Buffer{}, err
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}
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return newBufferFromBuffer(bb, 8), nil
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}
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}
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func (i *Interp) _isBuffer(c interface{}, a []interface{}) interface{} {
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_, ok := c.(ToBuffer)
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return ok
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}
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// note is used to implement tobytes*/0 also
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func (i *Interp) _toBitsRange(c interface{}, a []interface{}) interface{} {
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var unit int
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var r bool
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var ok bool
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if len(a) >= 1 {
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unit, ok = gojqextra.ToInt(a[0])
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if !ok {
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return gojqextra.FuncTypeError{Name: "_tobitsrange", V: a[0]}
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}
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} else {
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unit = 1
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}
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if len(a) >= 2 {
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r, ok = gojqextra.ToBoolean(a[1])
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if !ok {
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return gojqextra.FuncTypeError{Name: "_tobitsrange", V: a[1]}
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}
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} else {
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r = true
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}
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// TODO: unit > 8?
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bv, err := toBuffer(c)
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if err != nil {
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return err
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}
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bv.unit = unit
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if !r {
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bb, _ := bv.toBuffer()
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return newBufferFromBuffer(bb, unit)
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}
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return bv
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}
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type openFile struct {
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Buffer
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filename string
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progressFn progressreadseeker.ProgressFn
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}
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var _ Value = (*openFile)(nil)
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var _ ToBuffer = (*openFile)(nil)
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func (of *openFile) Display(w io.Writer, opts Options) error {
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_, err := fmt.Fprintf(w, "<openfile %q>\n", of.filename)
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return err
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}
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func (of *openFile) ToBuffer() (Buffer, error) {
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return newBufferFromBuffer(of.bb, 8), nil
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}
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// def open: #:: string| => buffer
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// opens a file for reading from filesystem
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// TODO: when to close? when bb loses all refs? need to use finalizer somehow?
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func (i *Interp) _open(c interface{}, a []interface{}) interface{} {
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var err error
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var f fs.File
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var path string
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switch c.(type) {
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case nil:
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path = "<stdin>"
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f = i.os.Stdin()
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default:
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path, err = toString(c)
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if err != nil {
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return fmt.Errorf("%s: %w", path, err)
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}
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f, err = i.os.FS().Open(path)
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if err != nil {
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return err
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}
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}
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var bEnd int64
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var fRS io.ReadSeeker
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fFI, err := f.Stat()
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if err != nil {
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f.Close()
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return err
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}
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// ctxreadseeker is used to make sure any io calls can be canceled
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// TODO: ctxreadseeker might leak if the underlaying call hangs forever
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// a regular file should be seekable but fallback below to read whole file if not
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if fFI.Mode().IsRegular() {
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if rs, ok := f.(io.ReadSeeker); ok {
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fRS = ctxreadseeker.New(i.evalContext.ctx, rs)
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bEnd = fFI.Size()
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}
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}
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if fRS == nil {
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buf, err := ioutil.ReadAll(ctxreadseeker.New(i.evalContext.ctx, &ioextra.ReadErrSeeker{Reader: f}))
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if err != nil {
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f.Close()
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return err
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}
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fRS = bytes.NewReader(buf)
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bEnd = int64(len(buf))
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}
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bbf := &openFile{
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filename: path,
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}
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const progressPrecision = 1024
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fRS = progressreadseeker.New(fRS, progressPrecision, bEnd,
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func(approxReadBytes int64, totalSize int64) {
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// progressFn is assign by decode etc
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if bbf.progressFn != nil {
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bbf.progressFn(approxReadBytes, totalSize)
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}
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},
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)
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const cacheReadAheadSize = 512 * 1024
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aheadRs := aheadreadseeker.New(fRS, cacheReadAheadSize)
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// bitio.Buffer -> (bitio.Reader) -> aheadreadseeker -> progressreadseeker -> ctxreadseeker -> readseeker
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bbf.bb, err = bitio.NewBufferFromReadSeeker(aheadRs)
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if err != nil {
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return err
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}
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return bbf
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}
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var _ Value = Buffer{}
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var _ ToBuffer = Buffer{}
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type Buffer struct {
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bb *bitio.Buffer
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r ranges.Range
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unit int
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}
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func newBufferFromBuffer(bb *bitio.Buffer, unit int) Buffer {
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return Buffer{
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bb: bb,
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r: ranges.Range{Start: 0, Len: bb.Len()},
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unit: unit,
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}
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}
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func (b Buffer) toBytesBuffer(r ranges.Range) (*bytes.Buffer, error) {
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bb, err := b.bb.BitBufRange(r.Start, r.Len)
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if err != nil {
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return nil, err
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}
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buf := &bytes.Buffer{}
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if _, err := io.Copy(buf, bb.Clone()); err != nil {
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return nil, err
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}
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return buf, nil
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}
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func (Buffer) ExtType() string { return "buffer" }
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func (Buffer) ExtKeys() []string {
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return []string{
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"size",
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"start",
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"stop",
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"bits",
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"bytes",
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}
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}
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func (b Buffer) ToBuffer() (Buffer, error) {
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return b, nil
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}
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func (b Buffer) JQValueLength() interface{} {
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return int(b.r.Len / int64(b.unit))
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}
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func (b Buffer) JQValueSliceLen() interface{} {
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return b.JQValueLength()
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}
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func (b Buffer) JQValueIndex(index int) interface{} {
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if index < 0 {
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return nil
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}
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buf, err := b.toBytesBuffer(ranges.Range{Start: b.r.Start + int64(index*b.unit), Len: int64(b.unit)})
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if err != nil {
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return err
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}
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extraBits := uint((8 - b.r.Len%8) % 8)
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return new(big.Int).Rsh(new(big.Int).SetBytes(buf.Bytes()), extraBits)
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}
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func (b Buffer) JQValueSlice(start int, end int) interface{} {
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rStart := int64(start * b.unit)
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rLen := int64((end - start) * b.unit)
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return Buffer{
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bb: b.bb,
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r: ranges.Range{Start: b.r.Start + rStart, Len: rLen},
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unit: b.unit,
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}
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}
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func (b Buffer) JQValueKey(name string) interface{} {
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switch name {
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case "size":
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return new(big.Int).SetInt64(b.r.Len / int64(b.unit))
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case "start":
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return new(big.Int).SetInt64(b.r.Start / int64(b.unit))
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case "stop":
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stop := b.r.Stop()
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stopUnits := stop / int64(b.unit)
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if stop%int64(b.unit) != 0 {
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stopUnits++
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}
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return new(big.Int).SetInt64(stopUnits)
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case "bits":
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if b.unit == 1 {
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return b
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}
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return Buffer{bb: b.bb, r: b.r, unit: 1}
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case "bytes":
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if b.unit == 8 {
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return b
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}
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return Buffer{bb: b.bb, r: b.r, unit: 8}
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}
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return nil
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}
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func (b Buffer) JQValueEach() interface{} {
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return nil
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}
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func (b Buffer) JQValueType() string {
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return "buffer"
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}
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func (b Buffer) JQValueKeys() interface{} {
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return gojqextra.FuncTypeNameError{Name: "keys", Typ: "buffer"}
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}
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func (b Buffer) JQValueHas(key interface{}) interface{} {
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return gojqextra.HasKeyTypeError{L: "buffer", R: fmt.Sprintf("%v", key)}
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}
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func (b Buffer) JQValueToNumber() interface{} {
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buf, err := b.toBytesBuffer(b.r)
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if err != nil {
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return err
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}
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extraBits := uint((8 - b.r.Len%8) % 8)
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return new(big.Int).Rsh(new(big.Int).SetBytes(buf.Bytes()), extraBits)
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}
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func (b Buffer) JQValueToString() interface{} {
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return b.JQValueToGoJQ()
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}
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func (b Buffer) JQValueToGoJQ() interface{} {
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buf, err := b.toBytesBuffer(b.r)
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if err != nil {
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return err
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}
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return buf.String()
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}
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func (b Buffer) JQValueUpdate(key interface{}, u interface{}, delpath bool) interface{} {
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return gojqextra.NonUpdatableTypeError{Key: fmt.Sprintf("%v", key), Typ: "buffer"}
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}
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func (b Buffer) Display(w io.Writer, opts Options) error {
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if opts.RawOutput {
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bb, err := b.toBuffer()
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if err != nil {
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return err
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}
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if _, err := io.Copy(w, bb.Clone()); err != nil {
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return err
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}
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return nil
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}
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return hexdump(w, b, opts)
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}
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func (b Buffer) toBuffer() (*bitio.Buffer, error) {
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return b.bb.BitBufRange(b.r.Start, b.r.Len)
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}
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