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camera_file.go
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camera_file.go
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package gphoto2
/** \file
*
* \author Copyright 2020 Jon Molin
*
* \note
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* \note
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* \note
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
// #cgo LDFLAGS: -lgphoto2 -lgphoto2_port
// #include <gphoto2/gphoto2.h>
// #include <stdlib.h>
// #include <string.h>
// #include <stdio.h>
import "C"
import (
"fmt"
"reflect"
"unsafe"
)
//DeleteFile tries to delete file from the camera, and returns error if it fails
func (camera *Camera) DeleteFile(path *CameraFilePath) error {
fileDir := C.CString(path.Folder)
defer C.free(unsafe.Pointer(fileDir))
fileName := C.CString(path.Name)
defer C.free(unsafe.Pointer(fileName))
res := C.gp_camera_file_delete(camera.gpCamera, fileDir, fileName, camera.Ctx.gpContext)
if res != GPOK {
return newError("Cannot delete fine on camera", int(res))
}
return nil
}
//ListFiles returns a list of files and folders on the camera
func (camera *Camera) ListFiles() ([]CameraStorageInfo, error) {
var gpCameraStorageInformation *C.CameraStorageInformation
var storageCount C.int
storageCount = 0
returnedStorageInfo := []CameraStorageInfo{}
res := C.gp_camera_get_storageinfo(camera.gpCamera, (**C.CameraStorageInformation)(unsafe.Pointer(&gpCameraStorageInformation)), &storageCount, camera.Ctx.gpContext)
if res != GPOK {
return nil, newError("Cannot get camera storage info", int(res))
}
defer C.free(unsafe.Pointer(gpCameraStorageInformation))
hdr := reflect.SliceHeader{
Data: uintptr(unsafe.Pointer(gpCameraStorageInformation)),
Len: int(storageCount),
Cap: int(storageCount),
}
nativeCameraFileSystemInfo := *(*[]C.CameraStorageInformation)(unsafe.Pointer(&hdr))
for i := 0; i < int(storageCount); i++ {
cameraStorage := CameraStorageInfo{
Description: C.GoString((*C.char)(&nativeCameraFileSystemInfo[i].description[0])),
Capacity: uint64(nativeCameraFileSystemInfo[i].capacitykbytes),
Free: uint64(nativeCameraFileSystemInfo[i].freekbytes),
FreeImages: uint64(nativeCameraFileSystemInfo[i].freeimages),
Children: []CameraFilePath{},
basedir: C.GoString((*C.char)(&nativeCameraFileSystemInfo[i].basedir[0])),
camera: camera,
}
if err := camera.recursiveListAllFiles(&cameraStorage.basedir, &cameraStorage.Children); err != nil {
return nil, err
}
returnedStorageInfo = append(returnedStorageInfo, cameraStorage)
}
return returnedStorageInfo, nil
}
func (camera *Camera) recursiveListAllFiles(basedir *string, children *[]CameraFilePath) error {
items, err := camera.findAllChildDirectories(basedir)
if err != nil {
return err
}
for _, dirName := range items {
dirItem := CameraFilePath{
Name: dirName,
Folder: *basedir,
Dir: true,
Children: []CameraFilePath{},
camera: camera,
}
childPath := *basedir + "/" + dirName
if err := camera.recursiveListAllFiles(&childPath, &dirItem.Children); err != nil {
return err
}
*children = append(*children, dirItem)
}
items, err = camera.findAllFilesInDir(basedir)
if err != nil {
return err
}
for _, fileName := range items {
fileItem := CameraFilePath{
Name: fileName,
Folder: *basedir,
Dir: false,
Children: nil,
camera: camera,
}
*children = append(*children, fileItem)
}
return nil
}
//Hmm, this could be reduced to one func, and a lambda passed as an arg
func (camera *Camera) findAllChildDirectories(basedirPath *string) ([]string, error) {
var gpFileList *C.CameraList
var err error
returnedSlice := []string{}
gpDirPath := C.CString(*basedirPath)
defer C.free(unsafe.Pointer(gpDirPath))
if gpFileList, err = newGphotoList(); err != nil {
return nil, err
}
defer C.gp_list_free(gpFileList)
if res := C.gp_camera_folder_list_folders(camera.gpCamera, gpDirPath, gpFileList, camera.Ctx.gpContext); res != GPOK {
return nil, newError(fmt.Sprintf("Cannot get folder list from dir %s", *basedirPath), int(res))
}
listSize := int(C.gp_list_count(gpFileList))
for i := 0; i < listSize; i++ {
var gpListElementName *C.char
C.gp_list_get_name(gpFileList, (C.int)(i), (**C.char)(&gpListElementName))
returnedSlice = append(returnedSlice, C.GoString(gpListElementName))
}
return returnedSlice, nil
}
func (camera *Camera) findAllFilesInDir(basedirPath *string) ([]string, error) {
var err error
returnedSlice := []string{}
gpDirPath := C.CString(*basedirPath)
defer C.free(unsafe.Pointer(gpDirPath))
gpFileList, err := newGphotoList()
if err != nil {
return nil, err
}
defer C.gp_list_free(gpFileList)
if res := C.gp_camera_folder_list_files(camera.gpCamera, gpDirPath, gpFileList, camera.Ctx.gpContext); res != GPOK {
return nil, newError(fmt.Sprintf("Cannot get file list from dir %s", *basedirPath), int(res))
}
listSize := int(C.gp_list_count(gpFileList))
for i := 0; i < listSize; i++ {
var gpListElementName *C.char
C.gp_list_get_name(gpFileList, (C.int)(i), (**C.char)(&gpListElementName))
returnedSlice = append(returnedSlice, C.GoString(gpListElementName))
}
return returnedSlice, nil
}