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package gpgme
// #include <string.h>
// #include <gpgme.h>
// #include <errno.h>
// #include "go_gpgme.h"
import "C"
import (
"io"
"os"
"runtime"
"unsafe"
)
const (
SeekSet = C.SEEK_SET
SeekCur = C.SEEK_CUR
SeekEnd = C.SEEK_END
)
//export gogpgme_readfunc
func gogpgme_readfunc(handle, buffer unsafe.Pointer, size C.size_t) C.ssize_t {
d := callbackLookup(uintptr(handle)).(*Data)
if len(d.buf) < int(size) {
d.buf = make([]byte, size)
}
n, err := d.r.Read(d.buf[:size])
if err != nil && err != io.EOF {
C.gpgme_err_set_errno(C.EIO)
return -1
}
C.memcpy(buffer, unsafe.Pointer(&d.buf[0]), C.size_t(n))
return C.ssize_t(n)
}
//export gogpgme_writefunc
func gogpgme_writefunc(handle, buffer unsafe.Pointer, size C.size_t) C.ssize_t {
d := callbackLookup(uintptr(handle)).(*Data)
if len(d.buf) < int(size) {
d.buf = make([]byte, size)
}
C.memcpy(unsafe.Pointer(&d.buf[0]), buffer, C.size_t(size))
n, err := d.w.Write(d.buf[:size])
if err != nil && err != io.EOF {
C.gpgme_err_set_errno(C.EIO)
return -1
}
return C.ssize_t(n)
}
//export gogpgme_seekfunc
func gogpgme_seekfunc(handle unsafe.Pointer, offset C.gpgme_off_t, whence C.int) C.gpgme_off_t {
d := callbackLookup(uintptr(handle)).(*Data)
n, err := d.s.Seek(int64(offset), int(whence))
if err != nil {
C.gpgme_err_set_errno(C.EIO)
return -1
}
return C.gpgme_off_t(n)
}
// The Data buffer used to communicate with GPGME
type Data struct {
dh C.gpgme_data_t // WARNING: Call runtime.KeepAlive(d) after ANY passing of d.dh to C
buf []byte
cbs C.struct_gpgme_data_cbs
r io.Reader
w io.Writer
s io.Seeker
cbc uintptr // WARNING: Call runtime.KeepAlive(d) after ANY use of d.cbc in C (typically via d.dh)
}
func newData() *Data {
d := &Data{}
runtime.SetFinalizer(d, (*Data).Close)
return d
}
// NewData returns a new memory based data buffer
func NewData() (*Data, error) {
d := newData()
return d, handleError(C.gpgme_data_new(&d.dh))
}
// NewDataFile returns a new file based data buffer
func NewDataFile(f *os.File) (*Data, error) {
d := newData()
return d, handleError(C.gpgme_data_new_from_fd(&d.dh, C.int(f.Fd())))
}
// NewDataBytes returns a new memory based data buffer that contains `b` bytes
func NewDataBytes(b []byte) (*Data, error) {
d := newData()
var cb *C.char
if len(b) != 0 {
cb = (*C.char)(unsafe.Pointer(&b[0]))
}
return d, handleError(C.gpgme_data_new_from_mem(&d.dh, cb, C.size_t(len(b)), 1))
}
// NewDataReader returns a new callback based data buffer
func NewDataReader(r io.Reader) (*Data, error) {
d := newData()
d.r = r
d.cbs.read = C.gpgme_data_read_cb_t(C.gogpgme_readfunc)
cbc := callbackAdd(d)
d.cbc = cbc
return d, handleError(C.gogpgme_data_new_from_cbs(&d.dh, &d.cbs, C.uintptr_t(cbc)))
}
// NewDataWriter returns a new callback based data buffer
func NewDataWriter(w io.Writer) (*Data, error) {
d := newData()
d.w = w
d.cbs.write = C.gpgme_data_write_cb_t(C.gogpgme_writefunc)
cbc := callbackAdd(d)
d.cbc = cbc
return d, handleError(C.gogpgme_data_new_from_cbs(&d.dh, &d.cbs, C.uintptr_t(cbc)))
}
// NewDataReadWriter returns a new callback based data buffer
func NewDataReadWriter(rw io.ReadWriter) (*Data, error) {
d := newData()
d.r = rw
d.w = rw
d.cbs.read = C.gpgme_data_read_cb_t(C.gogpgme_readfunc)
d.cbs.write = C.gpgme_data_write_cb_t(C.gogpgme_writefunc)
cbc := callbackAdd(d)
d.cbc = cbc
return d, handleError(C.gogpgme_data_new_from_cbs(&d.dh, &d.cbs, C.uintptr_t(cbc)))
}
// NewDataReadWriteSeeker returns a new callback based data buffer
func NewDataReadWriteSeeker(rw io.ReadWriteSeeker) (*Data, error) {
d := newData()
d.r = rw
d.w = rw
d.s = rw
d.cbs.read = C.gpgme_data_read_cb_t(C.gogpgme_readfunc)
d.cbs.write = C.gpgme_data_write_cb_t(C.gogpgme_writefunc)
d.cbs.seek = C.gpgme_data_seek_cb_t(C.gogpgme_seekfunc)
cbc := callbackAdd(d)
d.cbc = cbc
return d, handleError(C.gogpgme_data_new_from_cbs(&d.dh, &d.cbs, C.uintptr_t(cbc)))
}
// Close releases any resources associated with the data buffer
func (d *Data) Close() error {
if d.dh == nil {
return nil
}
if d.cbc > 0 {
callbackDelete(d.cbc)
}
_, err := C.gpgme_data_release(d.dh)
runtime.KeepAlive(d)
d.dh = nil
return err
}
func (d *Data) Write(p []byte) (int, error) {
n, err := C.gpgme_data_write(d.dh, unsafe.Pointer(&p[0]), C.size_t(len(p)))
runtime.KeepAlive(d)
if err != nil {
return 0, err
}
if n == 0 {
return 0, io.EOF
}
return int(n), nil
}
func (d *Data) Read(p []byte) (int, error) {
n, err := C.gpgme_data_read(d.dh, unsafe.Pointer(&p[0]), C.size_t(len(p)))
runtime.KeepAlive(d)
if err != nil {
return 0, err
}
if n == 0 {
return 0, io.EOF
}
return int(n), nil
}
func (d *Data) Seek(offset int64, whence int) (int64, error) {
n, err := C.gogpgme_data_seek(d.dh, C.gpgme_off_t(offset), C.int(whence))
runtime.KeepAlive(d)
return int64(n), err
}
// Name returns the associated filename if any
func (d *Data) Name() string {
res := C.GoString(C.gpgme_data_get_file_name(d.dh))
runtime.KeepAlive(d)
return res
}
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