source: trunk/core/ptp.c @ 1000

#include "camera.h"
#ifdef CAM_CHDK_PTP
#include "platform.h"
#include "stdlib.h"
#include "ptp.h"
#include "script.h"
#include "action_stack.h"
#include "lua.h"
#include "kbd.h"

#define BUF_SIZE 0x20000 // XXX what's a good camera-independent value?

static int handle_ptp(
                int h, ptp_data *data, int opcode, int sess_id, int trans_id,
                int param1, int param2, int param3, int param4, int param5);

void init_chdk_ptp()
{
  int r;
 
  // wait until ptp_handlers_info is initialised and add CHDK PTP interface
  r = 0x17;
  while ( r==0x17 )
  {
    r = add_ptp_handler(PTP_OC_CHDK,handle_ptp,0);
    msleep(250);
  }

  ExitTask();
}

static int recv_ptp_data(ptp_data *data, char *buf, int size)
  // repeated calls per transaction are ok
{
  while ( size >= BUF_SIZE )
  {
    data->recv_data(data->handle,buf,BUF_SIZE,0,0);
    // XXX check for success??

    size -= BUF_SIZE;
    buf += BUF_SIZE;
  }
  if ( size != 0 )
  {
    data->recv_data(data->handle,buf,size,0,0);
    // XXX check for success??
  }

  return 1;
}

static int send_ptp_data(ptp_data *data, const char *buf, int size)
  // repeated calls per transaction are *not* ok
{
  int tmpsize;
  
  tmpsize = size;
  while ( size >= BUF_SIZE )
  {
    if ( data->send_data(data->handle,buf,BUF_SIZE,tmpsize,0,0,0) )
    {
      return 0;
    }

    tmpsize = 0;
    size -= BUF_SIZE;
    buf += BUF_SIZE;
  }
  if ( size != 0 )
  {
    if ( data->send_data(data->handle,buf,size,tmpsize,0,0,0) )
    {
      return 0;
    }
  }

  return 1;
}

static lua_State *get_lua_thread(lua_State *L)
{
  lua_State *Lt;

  lua_getfield(L,LUA_REGISTRYINDEX,"Lt");
  Lt = lua_tothread(L,-1);
  lua_pop(L,1);

  return Lt;
}

static int handle_ptp(
               int h, ptp_data *data, int opcode, int sess_id, int trans_id,
               int param1, int param2, int param3, int param4, int param5)
{
  static union {
    char *str;
    lua_State *lua_state;
  } temp_data;
  static int temp_data_kind = 0; // 0: nothing, 1: ascii string, 2: lua object
  static int temp_data_extra; // size (ascii string) or type (lua object)
  PTPContainer ptp;

  // initialise default response
  memset(&ptp,0,sizeof(PTPContainer));
  ptp.code = PTP_RC_OK;
  ptp.sess_id = sess_id;
  ptp.trans_id = trans_id;
  ptp.num_param = 0;

  // handle command
  switch ( param1 )
  {

    case PTP_CHDK_Version:
      ptp.num_param = 2;
      ptp.param1 = PTP_CHDK_VERSION_MAJOR;
      ptp.param2 = PTP_CHDK_VERSION_MINOR;
      break;

    case PTP_CHDK_GetMemory:
      if ( param2 == 0 || param3 < 1 ) // null pointer or invalid size?
      {
        ptp.code = PTP_RC_GeneralError;
        break;
      }

      if ( !send_ptp_data(data,(char *) param2,param3) )
      {
        ptp.code = PTP_RC_GeneralError;
      }
      break;
      
    case PTP_CHDK_SetMemory:
      if ( param2 == 0 || param3 < 1 ) // null pointer or invalid size?
      {
        ptp.code = PTP_RC_GeneralError;
        break;
      }

      data->get_data_size(data->handle); // XXX required call before receiving
      if ( !recv_ptp_data(data,(char *) param2,param3) )
      {
        ptp.code = PTP_RC_GeneralError;
      }
      break;

    case PTP_CHDK_CallFunction:
      {
        int s;
        int *buf = (int *) malloc((10+1)*sizeof(int));

        if ( buf == NULL )
        {
          ptp.code = PTP_RC_GeneralError;
          break;
        }

        s = data->get_data_size(data->handle);
        if ( !recv_ptp_data(data,(char *) buf,s) )
        {
          ptp.code = PTP_RC_GeneralError;
          break;
        }

        ptp.num_param = 1;
        ptp.param1 = ((int (*)(int,int,int,int,int,int,int,int,int,int)) buf[0])(buf[1],buf[2],buf[3],buf[4],buf[5],buf[6],buf[7],buf[8],buf[9],buf[10]);

        free(buf);
        break;
      }

    case PTP_CHDK_TempData:
      if ( param2 & PTP_CHDK_TD_DOWNLOAD )
      {
        const char *s;
        size_t l;

        if ( temp_data_kind == 0 )
        {
          ptp.code = PTP_RC_GeneralError;
          break;
        }

        if ( temp_data_kind == 1 )
        {
          s = temp_data.str;
          l = temp_data_extra;
        } else { // temp_data_kind == 2
          s = lua_tolstring(get_lua_thread(temp_data.lua_state),1,&l);
        }

        if ( !send_ptp_data(data,s,l) )
        {
          ptp.code = PTP_RC_GeneralError;
          break;
        }
        
      } else if ( ! (param2 & PTP_CHDK_TD_CLEAR) ) {
        if ( temp_data_kind == 1 )
        {
          free(temp_data.str);
        } else if ( temp_data_kind == 2 )
        {
          lua_close(temp_data.lua_state);
        }
        temp_data_kind = 0;

        temp_data_extra = data->get_data_size(data->handle);

        temp_data.str = (char *) malloc(temp_data_extra);
        if ( temp_data.str == NULL )
        {
          ptp.code = PTP_RC_GeneralError;
          break;
        }

        if ( !recv_ptp_data(data,temp_data.str,temp_data_extra) )
        {
          ptp.code = PTP_RC_GeneralError;
          break;
        }
        temp_data_kind = 1;
      }
      if ( param2 & PTP_CHDK_TD_CLEAR )
      {
        if ( temp_data_kind == 1 )
        {
          free(temp_data.str);
        } else if ( temp_data_kind == 2 )
        {
          lua_close(temp_data.lua_state);
        }
        temp_data_kind = 0;
      }
      break;

    case PTP_CHDK_UploadFile:
      {
        FILE *f;
        int s,r,fn_len;
        char *buf, *fn;

        s = data->get_data_size(data->handle);

        recv_ptp_data(data,(char *) &fn_len,4);
        s -= 4;

        fn = (char *) malloc(fn_len+1);
        if ( fn == NULL )
        {
          ptp.code = PTP_RC_GeneralError;
          break;
        }
        fn[fn_len] = '\0';

        recv_ptp_data(data,fn,fn_len);
        s -= fn_len;

        f = fopen(fn,"wb");
        if ( f == NULL )
        {
          ptp.code = PTP_RC_GeneralError;
          free(fn);
          break;
        }
        free(fn);

        buf = (char *) malloc(BUF_SIZE);
        if ( buf == NULL )
        {
          ptp.code = PTP_RC_GeneralError;
          break;
        }
        while ( s > 0 )
        {
          if ( s >= BUF_SIZE )
          {
            recv_ptp_data(data,buf,BUF_SIZE);
            fwrite(buf,1,BUF_SIZE,f);
            s -= BUF_SIZE;
          } else {
            recv_ptp_data(data,buf,s);
            fwrite(buf,1,s,f);
            s = 0;
          }
        }

        fclose(f);

        free(buf);
        break;
      }
      
    case PTP_CHDK_DownloadFile:
      {
        FILE *f;
        int tmp,t,s,r,fn_len;
        char *buf, *fn;

        if ( temp_data_kind != 1 )
        {
          ptp.code = PTP_RC_GeneralError;
          break;
        }

        fn = (char *) malloc(temp_data_extra+1);
        if ( fn == NULL )
        {
          free(temp_data.str);
          temp_data_kind = 0;
          ptp.code = PTP_RC_GeneralError;
          break;
        }
        memcpy(fn,temp_data.str,temp_data_extra);
        fn[temp_data_extra] = '\0';

        free(temp_data.str);
        temp_data_kind = 0;

        f = fopen(fn,"rb");
        if ( f == NULL )
        {
          ptp.code = PTP_RC_GeneralError;
          free(fn);
          break;
        }
        free(fn);

        fseek(f,0,SEEK_END);
        s = ftell(f);
        fseek(f,0,SEEK_SET);

        buf = (char *) malloc(BUF_SIZE);
        if ( buf == NULL )
        {
          ptp.code = PTP_RC_GeneralError;
          break;
        }

        tmp = s;
        t = s;
        while ( (r = fread(buf,1,(t<BUF_SIZE)?t:BUF_SIZE,f)) > 0 )
        {
          t -= r;
          // cannot use send_ptp_data here
          data->send_data(data->handle,buf,r,tmp,0,0,0);
          tmp = 0;
        }
        fclose(f);
        // XXX check that we actually read/send s bytes! (t == 0)

        ptp.num_param = 1;
        ptp.param1 = s;

        free(buf);

        break;
      }
      break;

    case PTP_CHDK_ExecuteScript:
      {
        int s;
        char *buf;

        if ( param2 != PTP_CHDK_SL_LUA )
        {
          ptp.code = PTP_RC_ParameterNotSupported;
          break;
        }

        s = data->get_data_size(data->handle);
        
        buf = (char *) malloc(s);
        if ( buf == NULL )
        {
          ptp.code = PTP_RC_GeneralError;
          break;
        }

        recv_ptp_data(data,buf,s);

        long script_action_stack = script_start_ptp(buf, param3&PTP_CHDK_ES_RESULT);

        free(buf);

        if ( param3 & PTP_CHDK_ES_WAIT )
        {

          while ( script_is_running() )
            msleep(100);

          if ( param3 & PTP_CHDK_ES_RESULT )
          {
            lua_State *Lt;
            temp_data.lua_state = lua_get_result();
            Lt = get_lua_thread(temp_data.lua_state);
            temp_data_kind = 2;
            if ( lua_gettop(Lt) == 0 )
            {
              temp_data_extra = PTP_CHDK_TYPE_NOTHING;
            } else if ( lua_isnil(Lt,1) )
            {
              temp_data_extra = PTP_CHDK_TYPE_NIL;
            } else if ( lua_isboolean(Lt,1) )
            {
              temp_data_extra = PTP_CHDK_TYPE_BOOLEAN;
            } else if ( lua_isnumber(Lt,1) )
            {
              temp_data_extra = PTP_CHDK_TYPE_INTEGER;
            } else if ( lua_isstring(Lt,1) )
            {
              temp_data_extra = PTP_CHDK_TYPE_STRING;
            } else {
              temp_data_extra = PTP_CHDK_TYPE_NOTHING;
            }
            ptp.num_param = 1;
            ptp.param1 = temp_data_extra;
            if ( temp_data_extra != PTP_CHDK_TYPE_STRING )
            {
              if ( temp_data_extra == PTP_CHDK_TYPE_BOOLEAN )
              {
                ptp.num_param = 2;
                ptp.param2 = lua_toboolean(Lt,1);
              } if ( temp_data_extra == PTP_CHDK_TYPE_INTEGER )
              {
                ptp.num_param = 2;
                ptp.param2 = lua_tonumber(Lt,1);
              }
              lua_close(Lt);
              temp_data_kind = 0;
            } else {
              ptp.num_param = 2;
              ptp.param2 = lua_objlen(Lt,1);
            }
          }
        }

        break;
      }

    default:
      ptp.code = PTP_RC_ParameterNotSupported;
      break;
  }

  // send response
  data->send_resp( data->handle, &ptp );
  
  return 1;
}

#endif // CAM_CHDK_PTP