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sane-project-backends/backend/escl/escl.c

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/* sane - Scanner Access Now Easy.
Copyright (C) 2019 Touboul Nathane
Copyright (C) 2019 Thierry HUCHARD <thierry@ordissimo.com>
This file is part of the SANE package.
SANE is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
SANE 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 General Public License
for more details.
You should have received a copy of the GNU General Public License
along with sane; see the file COPYING. If not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
This file implements a SANE backend for eSCL scanners. */
#include "escl.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include <curl/curl.h>
#include "../include/sane/saneopts.h"
#include "../include/sane/sanei.h"
#include "../include/sane/sanei_backend.h"
#include "../include/sane/sanei_config.h"
#define min(A,B) (((A)<(B)) ? (A) : (B))
#define max(A,B) (((A)>(B)) ? (A) : (B))
#define INPUT_BUFFER_SIZE 4096
static const SANE_Device **devlist = NULL;
static ESCL_Device *list_devices_primary = NULL;
static int num_devices = 0;
typedef struct Handled {
struct Handled *next;
SANE_String_Const name;
char *result;
ESCL_ScanParam param;
SANE_Option_Descriptor opt[NUM_OPTIONS];
Option_Value val[NUM_OPTIONS];
capabilities_t *scanner;
SANE_Range x_range;
SANE_Range y_range;
SANE_Bool cancel;
SANE_Bool write_scan_data;
SANE_Bool decompress_scan_data;
SANE_Bool end_read;
SANE_Parameters ps;
} escl_sane_t;
/**
* \fn static SANE_Status escl_add_in_list(ESCL_Device *current)
* \brief Function that adds all the element needed to my list :
* the port number, the model name, the ip address, and the type of url (http/https).
* Moreover, this function counts the number of devices found.
*
* \return SANE_STATUS_GOOD if everything is OK.
*/
static SANE_Status
escl_add_in_list(ESCL_Device *current)
{
if (!current->ip_address) {
DBG (10, "Ip Address allocation failure.\n");
goto free_device;
}
if (current->port_nb == 0) {
DBG (10, "No port defined.\n");
goto free_device;
}
if (!current->model_name) {
DBG (10, "Modele Name allocation failure.\n");
goto free_device;
}
if (!current->type) {
DBG (10, "Scanner Type allocation failure.\n");
goto free_device;
}
++num_devices;
current->next = list_devices_primary;
list_devices_primary = current;
return (SANE_STATUS_GOOD);
free_device:
if(current->ip_address)
free((void*)current->ip_address);
if(current->model_name)
free((void*)current->model_name);
if(current->type)
free((void*)current->type);
free(current);
return (SANE_STATUS_NO_MEM);
}
/**
* \fn SANE_Status escl_device_add(int port_nb, const char *model_name, char *ip_address, char *type)
* \brief Function that browses my list ('for' loop) and returns the "escl_add_in_list" function to
* adds all the element needed to my list :
* the port number, the model name, the ip address and the type of the url (http / https).
*
* \return escl_add_in_list(current)
*/
SANE_Status
escl_device_add(int port_nb, const char *model_name, char *ip_address, char *type)
{
char tmp[PATH_MAX] = { 0 };
char *model = NULL;
ESCL_Device *current = NULL;
DBG (10, "escl_device_add\n");
for (current = list_devices_primary; current; current = current->next) {
if (strcmp(current->ip_address, ip_address) == 0 && current->port_nb == port_nb
&& strcmp(current->type, type) == 0)
return (SANE_STATUS_GOOD);
}
current = (ESCL_Device*)calloc(1, sizeof(*current));
if (current == NULL) {
DBG (10, "New device allocation failure.\n");
return (SANE_STATUS_NO_MEM);
}
current->port_nb = port_nb;
if (strcmp(type, "_uscan._tcp") != 0 && strcmp(type, "http") != 0) {
snprintf(tmp, sizeof(tmp), "%s SSL", model_name);
}
model = (char*)(tmp[0] != 0 ? tmp : model_name);
current->model_name = strdup(model);
current->ip_address = strdup(ip_address);
current->type = strdup(type);
return escl_add_in_list(current);
}
/**
* \fn static inline size_t max_string_size(const SANE_String_Const strings[])
* \brief Function that browses the string ('for' loop) and counts the number of character in the string.
* --> this allows to know the maximum size of the string.
*
* \return max_size + 1 (the size max)
*/
static inline size_t
max_string_size(const SANE_String_Const strings[])
{
size_t max_size = 0;
int i = 0;
for (i = 0; strings[i]; ++i) {
size_t size = strlen (strings[i]);
if (size > max_size)
max_size = size;
}
return (max_size + 1);
}
/**
* \fn static SANE_Device *convertFromESCLDev(ESCL_Device *cdev)
* \brief Function that checks if the url of the received scanner is secured or not (http / https).
* --> if the url is not secured, our own url will be composed like "http://'ip':'port'".
* --> else, our own url will be composed like "https://'ip':'port'".
* AND, it's in this function that we gather all the informations of the url (that were in our list) :
* the model_name, the port, the ip, and the type of url.
* SO, leaving this function, we have in memory the complete url.
*
* \return sdev (structure that contains the elements of the url)
*/
static SANE_Device *
convertFromESCLDev(ESCL_Device *cdev)
{
char tmp[PATH_MAX] = { 0 };
SANE_Device *sdev = (SANE_Device*) calloc(1, sizeof(SANE_Device));
if (!sdev) {
DBG (10, "Sane_Device allocation failure.\n");
return NULL;
}
if (strcmp(cdev->type, "_uscan._tcp") == 0 || strcmp(cdev->type, "http") == 0)
snprintf(tmp, sizeof(tmp), "http://%s:%d", cdev->ip_address, cdev->port_nb);
else
snprintf(tmp, sizeof(tmp), "https://%s:%d", cdev->ip_address, cdev->port_nb);
DBG( 1, "Escl add device : %s\n", tmp);
sdev->name = strdup(tmp);
if (!sdev->name) {
DBG (10, "Name allocation failure.\n");
goto freedev;
}
sdev->model = strdup(cdev->model_name);
if (!sdev->model) {
DBG (10, "Model allocation failure.\n");
goto freename;
}
sdev->vendor = strdup("ESCL");
if (!sdev->vendor) {
DBG (10, "Vendor allocation failure.\n");
goto freemodel;
}
sdev->type = strdup("flatbed scanner");
if (!sdev->type) {
DBG (10, "Scanner Type allocation failure.\n");
goto freevendor;
}
return (sdev);
freevendor:
free((void*)sdev->vendor);
freemodel:
free((void*)sdev->model);
freename:
free((void*)sdev->name);
freedev:
free((void*)sdev);
return NULL;
}
/**
* \fn SANE_Status sane_init(SANE_Int *version_code, SANE_Auth_Callback authorize)
* \brief Function that's called before any other SANE function ; it's the first SANE function called.
* --> this function checks the SANE config. and can check the authentication of the user if
* 'authorize' value is more than SANE_TRUE.
* In this case, it will be necessary to define an authentication method.
*
* \return SANE_STATUS_GOOD (everything is OK)
*/
SANE_Status
sane_init(SANE_Int *version_code, SANE_Auth_Callback __sane_unused__ authorize)
{
DBG_INIT();
DBG (10, "escl sane_init\n");
SANE_Status status = SANE_STATUS_GOOD;
curl_global_init(CURL_GLOBAL_ALL);
if (version_code != NULL)
*version_code = SANE_VERSION_CODE(1, 0, 0);
if (status != SANE_STATUS_GOOD)
return (status);
return (SANE_STATUS_GOOD);
}
/**
* \fn void sane_exit(void)
* \brief Function that must be called to terminate use of a backend.
* This function will first close all device handles that still might be open.
* --> by freeing all the elements of my list.
* After this function, no function other than 'sane_init' may be called.
*/
void
sane_exit(void)
{
DBG (10, "escl sane_exit\n");
ESCL_Device *next = NULL;
while (list_devices_primary != NULL) {
next = list_devices_primary->next;
free(list_devices_primary);
list_devices_primary = next;
}
if (devlist)
free (devlist);
list_devices_primary = NULL;
devlist = NULL;
curl_global_cleanup();
}
/**
* \fn static SANE_Status attach_one_config(SANEI_Config *config, const char *line)
* \brief Function that implements a configuration file to the user :
* if the user can't detect some devices, he will be able to force their detection with this config' file to use them.
* Thus, this function parses the config' file to use the device of the user with the information below :
* the type of protocol (http/https), the ip, the port number, and the model name.
*
* \return escl_add_in_list(escl_device) if the parsing worked, SANE_STATUS_GOOD otherwise.
*/
static SANE_Status
attach_one_config(SANEI_Config __sane_unused__ *config, const char *line)
{
int port = 0;
static ESCL_Device *escl_device = NULL;
if (strncmp(line, "[device]", 8) == 0) {
escl_device = (ESCL_Device*)calloc(1, sizeof(ESCL_Device));
if (!escl_device) {
DBG (10, "New Escl_Device allocation failure.\n");
return (SANE_STATUS_NO_MEM);
}
}
if (strncmp(line, "ip", 2) == 0) {
const char *ip_space = sanei_config_skip_whitespace(line + 2);
if (escl_device != NULL && ip_space != NULL) {
escl_device->ip_address = strdup(ip_space);
}
}
if (sscanf(line, "port %i", &port) == 1 && port != 0) {
const char *port_space = sanei_config_skip_whitespace(line + 4);
if (escl_device != NULL && port_space != NULL) {
escl_device->port_nb = port;
}
}
if (strncmp(line, "model", 5) == 0) {
const char *model_space = sanei_config_skip_whitespace(line + 5);
if (escl_device != NULL && model_space != NULL) {
escl_device->model_name = strdup(model_space);
}
}
if (strncmp(line, "type", 4) == 0) {
const char *type_space = sanei_config_skip_whitespace(line + 4);
if (escl_device != NULL && type_space != NULL) {
escl_device->type = strdup(type_space);
}
}
return (escl_add_in_list(escl_device));
}
/**
* \fn SANE_Status sane_get_devices(const SANE_Device ***device_list, SANE_Bool local_only)
* \brief Function that searches for connected devices and places them in our 'device_list'. ('for' loop)
* If the attribute 'local_only' is worth SANE_FALSE, we only returns the connected devices locally.
*
* \return SANE_STATUS_GOOD if devlist != NULL ; SANE_STATUS_NO_MEM otherwise.
*/
SANE_Status
sane_get_devices(const SANE_Device ***device_list, SANE_Bool local_only)
{
if (local_only) /* eSCL is a network-only protocol */
return (device_list ? SANE_STATUS_GOOD : SANE_STATUS_INVAL);
DBG (10, "escl sane_get_devices\n");
ESCL_Device *dev = NULL;
static const SANE_Device **devlist = 0;
SANE_Status status;
if (device_list == NULL)
return (SANE_STATUS_INVAL);
status = sanei_configure_attach(ESCL_CONFIG_FILE, NULL, attach_one_config);
if (status != SANE_STATUS_GOOD)
return (status);
escl_devices(&status);
if (status != SANE_STATUS_GOOD)
return (status);
if (devlist)
free(devlist);
devlist = (const SANE_Device **) calloc (num_devices + 1, sizeof (devlist[0]));
if (devlist == NULL)
return (SANE_STATUS_NO_MEM);
int i = 0;
for (dev = list_devices_primary; i < num_devices; dev = dev->next) {
SANE_Device *s_dev = convertFromESCLDev(dev);
devlist[i] = s_dev;
i++;
}
devlist[i] = 0;
*device_list = devlist;
return (devlist) ? SANE_STATUS_GOOD : SANE_STATUS_NO_MEM;
}
/**
* \fn static SANE_Status init_options(SANE_String_Const name, escl_sane_t *s)
* \brief Function thzt initializes all the needed options of the received scanner
* (the resolution / the color / the margins) thanks to the informations received with
* the 'escl_capabilities' function, called just before.
*
* \return status (if everything is OK, status = SANE_STATUS_GOOD)
*/
static SANE_Status
init_options(SANE_String_Const name, escl_sane_t *s)
{
DBG (10, "escl init_options\n");
SANE_Status status = SANE_STATUS_GOOD;
int i = 0;
if (name == NULL)
return (SANE_STATUS_INVAL);
memset (s->opt, 0, sizeof (s->opt));
memset (s->val, 0, sizeof (s->val));
for (i = 0; i < NUM_OPTIONS; ++i) {
s->opt[i].size = sizeof (SANE_Word);
s->opt[i].cap = SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT;
}
s->x_range.min = PIXEL_TO_MM(s->scanner->MinWidth, 300.0);
s->x_range.max = PIXEL_TO_MM(s->scanner->MaxWidth, 300.0);
s->x_range.quant = 0;
s->y_range.min = PIXEL_TO_MM(s->scanner->MinHeight, 300.0);
s->y_range.max = PIXEL_TO_MM(s->scanner->MaxHeight, 300.0);
s->y_range.quant = 0;
s->opt[OPT_NUM_OPTS].title = SANE_TITLE_NUM_OPTIONS;
s->opt[OPT_NUM_OPTS].desc = SANE_DESC_NUM_OPTIONS;
s->opt[OPT_NUM_OPTS].type = SANE_TYPE_INT;
s->opt[OPT_NUM_OPTS].cap = SANE_CAP_SOFT_DETECT;
s->val[OPT_NUM_OPTS].w = NUM_OPTIONS;
s->opt[OPT_MODE_GROUP].title = SANE_TITLE_SCAN_MODE;
s->opt[OPT_MODE_GROUP].desc = "";
s->opt[OPT_MODE_GROUP].type = SANE_TYPE_GROUP;
s->opt[OPT_MODE_GROUP].cap = 0;
s->opt[OPT_MODE_GROUP].constraint_type = SANE_CONSTRAINT_NONE;
s->opt[OPT_MODE].name = SANE_NAME_SCAN_MODE;
s->opt[OPT_MODE].title = SANE_TITLE_SCAN_MODE;
s->opt[OPT_MODE].desc = SANE_DESC_SCAN_MODE;
s->opt[OPT_MODE].type = SANE_TYPE_STRING;
s->opt[OPT_MODE].unit = SANE_UNIT_NONE;
s->opt[OPT_MODE].constraint_type = SANE_CONSTRAINT_STRING_LIST;
s->opt[OPT_MODE].constraint.string_list = s->scanner->ColorModes;
s->val[OPT_MODE].s = (char *)strdup(s->scanner->ColorModes[0]);
if (!s->val[OPT_MODE].s) {
DBG (10, "Color Mode Default allocation failure.\n");
return (SANE_STATUS_NO_MEM);
}
s->opt[OPT_MODE].size = max_string_size(s->scanner->ColorModes);
s->scanner->default_color = (char *)strdup(s->scanner->ColorModes[0]);
if (!s->scanner->default_color) {
DBG (10, "Color Mode Default allocation failure.\n");
return (SANE_STATUS_NO_MEM);
}
s->opt[OPT_RESOLUTION].name = SANE_NAME_SCAN_RESOLUTION;
s->opt[OPT_RESOLUTION].title = SANE_TITLE_SCAN_RESOLUTION;
s->opt[OPT_RESOLUTION].desc = SANE_DESC_SCAN_RESOLUTION;
s->opt[OPT_RESOLUTION].type = SANE_TYPE_INT;
s->opt[OPT_RESOLUTION].unit = SANE_UNIT_DPI;
s->opt[OPT_RESOLUTION].constraint_type = SANE_CONSTRAINT_WORD_LIST;
s->opt[OPT_RESOLUTION].constraint.word_list = s->scanner->SupportedResolutions;
s->val[OPT_RESOLUTION].w = s->scanner->SupportedResolutions[1];
s->scanner->default_resolution = s->scanner->SupportedResolutions[1];
s->opt[OPT_PREVIEW].name = SANE_NAME_PREVIEW;
s->opt[OPT_PREVIEW].title = SANE_TITLE_PREVIEW;
s->opt[OPT_PREVIEW].desc = SANE_DESC_PREVIEW;
s->opt[OPT_PREVIEW].cap = SANE_CAP_SOFT_DETECT | SANE_CAP_SOFT_SELECT;
s->opt[OPT_PREVIEW].type = SANE_TYPE_BOOL;
s->val[OPT_PREVIEW].w = SANE_FALSE;
s->opt[OPT_GRAY_PREVIEW].name = SANE_NAME_GRAY_PREVIEW;
s->opt[OPT_GRAY_PREVIEW].title = SANE_TITLE_GRAY_PREVIEW;
s->opt[OPT_GRAY_PREVIEW].desc = SANE_DESC_GRAY_PREVIEW;
s->opt[OPT_GRAY_PREVIEW].type = SANE_TYPE_BOOL;
s->val[OPT_GRAY_PREVIEW].w = SANE_FALSE;
s->opt[OPT_GEOMETRY_GROUP].title = SANE_TITLE_GEOMETRY;
s->opt[OPT_GEOMETRY_GROUP].desc = SANE_DESC_GEOMETRY;
s->opt[OPT_GEOMETRY_GROUP].type = SANE_TYPE_GROUP;
s->opt[OPT_GEOMETRY_GROUP].cap = SANE_CAP_ADVANCED;
s->opt[OPT_GEOMETRY_GROUP].constraint_type = SANE_CONSTRAINT_NONE;
s->opt[OPT_TL_X].name = SANE_NAME_SCAN_TL_X;
s->opt[OPT_TL_X].title = SANE_TITLE_SCAN_TL_X;
s->opt[OPT_TL_X].desc = SANE_DESC_SCAN_TL_X;
s->opt[OPT_TL_X].type = SANE_TYPE_FIXED;
s->opt[OPT_TL_X].size = sizeof(SANE_Fixed);
s->opt[OPT_TL_X].cap = SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT;
s->opt[OPT_TL_X].unit = SANE_UNIT_MM;
s->opt[OPT_TL_X].constraint_type = SANE_CONSTRAINT_RANGE;
s->opt[OPT_TL_X].constraint.range = &s->x_range;
s->opt[OPT_TL_Y].name = SANE_NAME_SCAN_TL_Y;
s->opt[OPT_TL_Y].title = SANE_TITLE_SCAN_TL_Y;
s->opt[OPT_TL_Y].desc = SANE_DESC_SCAN_TL_Y;
s->opt[OPT_TL_Y].type = SANE_TYPE_FIXED;
s->opt[OPT_TL_Y].size = sizeof(SANE_Fixed);
s->opt[OPT_TL_Y].cap = SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT;
s->opt[OPT_TL_Y].unit = SANE_UNIT_MM;
s->opt[OPT_TL_Y].constraint_type = SANE_CONSTRAINT_RANGE;
s->opt[OPT_TL_Y].constraint.range = &s->y_range;
s->opt[OPT_BR_X].name = SANE_NAME_SCAN_BR_X;
s->opt[OPT_BR_X].title = SANE_TITLE_SCAN_BR_X;
s->opt[OPT_BR_X].desc = SANE_DESC_SCAN_BR_X;
s->opt[OPT_BR_X].type = SANE_TYPE_FIXED;
s->opt[OPT_BR_X].size = sizeof(SANE_Fixed);
s->opt[OPT_BR_X].cap = SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT;
s->opt[OPT_BR_X].unit = SANE_UNIT_MM;
s->opt[OPT_BR_X].constraint_type = SANE_CONSTRAINT_RANGE;
s->opt[OPT_BR_X].constraint.range = &s->x_range;
s->opt[OPT_BR_Y].name = SANE_NAME_SCAN_BR_Y;
s->opt[OPT_BR_Y].title = SANE_TITLE_SCAN_BR_Y;
s->opt[OPT_BR_Y].desc = SANE_DESC_SCAN_BR_Y;
s->opt[OPT_BR_Y].type = SANE_TYPE_FIXED;
s->opt[OPT_BR_Y].size = sizeof(SANE_Fixed);
s->opt[OPT_BR_Y].cap = SANE_CAP_SOFT_SELECT | SANE_CAP_SOFT_DETECT;
s->opt[OPT_BR_Y].unit = SANE_UNIT_MM;
s->opt[OPT_BR_Y].constraint_type = SANE_CONSTRAINT_RANGE;
s->opt[OPT_BR_Y].constraint.range = &s->y_range;
return (status);
}
/**
* \fn SANE_Status sane_open(SANE_String_Const name, SANE_Handle *h)
* \brief Function that establishes a connection with the device named by 'name',
* and returns a 'handler' using 'SANE_Handle *h', representing it.
* Thus, it's this function that calls the 'escl_status' function firstly,
* then the 'escl_capabilities' function, and, after, the 'init_options' function.
*
* \return status (if everything is OK, status = SANE_STATUS_GOOD, otherwise, SANE_STATUS_NO_MEM/SANE_STATUS_INVAL)
*/
SANE_Status
sane_open(SANE_String_Const name, SANE_Handle *h)
{
DBG (10, "escl sane_open\n");
SANE_Status status;
escl_sane_t *handler = NULL;
if (name == NULL)
return (SANE_STATUS_INVAL);
status = escl_status(name);
if (status != SANE_STATUS_GOOD)
return (status);
handler = (escl_sane_t *)calloc(1, sizeof(escl_sane_t));
if (handler == NULL)
return (SANE_STATUS_NO_MEM);
handler->name = strdup(name);
if (!handler->name) {
DBG (10, "Handle Name allocation failure.\n");
return (SANE_STATUS_NO_MEM);
}
handler->scanner = escl_capabilities(name, &status);
if (status != SANE_STATUS_GOOD)
return (status);
status = init_options(name, handler);
if (status != SANE_STATUS_GOOD)
return (status);
handler->ps.depth = 8;
handler->ps.last_frame = SANE_TRUE;
handler->ps.format = SANE_FRAME_RGB;
handler->ps.pixels_per_line = MM_TO_PIXEL(handler->val[OPT_BR_X].w, 300.0);
handler->ps.lines = MM_TO_PIXEL(handler->val[OPT_BR_Y].w, 300.0);
handler->ps.bytes_per_line = handler->ps.pixels_per_line * 3;
status = sane_get_parameters(handler, 0);
if (status != SANE_STATUS_GOOD)
return (status);
handler->cancel = SANE_FALSE;
handler->write_scan_data = SANE_FALSE;
handler->decompress_scan_data = SANE_FALSE;
handler->end_read = SANE_FALSE;
*h = handler;
return (status);
}
/**
* \fn void sane_cancel(SANE_Handle h)
* \brief Function that's used to, immediately or as quickly as possible, cancel the currently
* pending operation of the device represented by 'SANE_Handle h'.
* This functions calls the 'escl_scanner' functions, that resets the scan operations.
*/
void
sane_cancel(SANE_Handle h)
{
DBG (10, "escl sane_cancel\n");
escl_sane_t *handler = h;
if (handler->scanner->tmp)
{
fclose(handler->scanner->tmp);
handler->scanner->tmp = NULL;
}
handler->cancel = SANE_TRUE;
escl_scanner(handler->name, handler->result);
}
/**
* \fn void sane_close(SANE_Handle h)
* \brief Function that closes the communication with the device represented by 'SANE_Handle h'.
* This function must release the resources that were allocated to the opening of 'h'.
*/
void
sane_close(SANE_Handle h)
{
DBG (10, "escl sane_close\n");
if (h != NULL) {
free(h);
h = NULL;
}
}
/**
* \fn const SANE_Option_Descriptor *sane_get_option_descriptor(SANE_Handle h, SANE_Int n)
* \brief Function that retrieves a descriptor from the n number option of the scanner
* represented by 'h'.
* The descriptor remains valid until the machine is closed.
*
* \return s->opt + n
*/
const SANE_Option_Descriptor *
sane_get_option_descriptor(SANE_Handle h, SANE_Int n)
{
DBG (10, "escl sane_get_option_descriptor\n");
escl_sane_t *s = h;
if ((unsigned) n >= NUM_OPTIONS || n < 0)
return (0);
return (&s->opt[n]);
}
/**
* \fn SANE_Status sane_control_option(SANE_Handle h, SANE_Int n, SANE_Action a, void *v, SANE_Int *i)
* \brief Function that defines the actions to perform for the 'n' option of the machine,
* represented by 'h', if the action is 'a'.
* There are 3 types of possible actions :
* --> SANE_ACTION_GET_VALUE: 'v' must be used to provide the value of the option.
* --> SANE_ACTION_SET_VALUE: The option must take the 'v' value.
* --> SANE_ACTION_SET_AUTO: The backend or machine must affect the option with an appropriate value.
* Moreover, the parameter 'i' is used to provide additional information about the state of
* 'n' option if SANE_ACTION_SET_VALUE has been performed.
*
* \return SANE_STATUS_GOOD if everything is OK, otherwise, SANE_STATUS_NO_MEM/SANE_STATUS_INVAL
*/
SANE_Status
sane_control_option(SANE_Handle h, SANE_Int n, SANE_Action a, void *v, SANE_Int *i)
{
DBG (10, "escl sane_control_option\n");
escl_sane_t *handler = h;
if (i)
*i = 0;
if (n >= NUM_OPTIONS || n < 0)
return (SANE_STATUS_INVAL);
if (a == SANE_ACTION_GET_VALUE) {
switch (n) {
case OPT_TL_X:
case OPT_TL_Y:
case OPT_BR_X:
case OPT_BR_Y:
case OPT_NUM_OPTS:
case OPT_RESOLUTION:
case OPT_PREVIEW:
case OPT_GRAY_PREVIEW:
*(SANE_Word *) v = handler->val[n].w;
break;
case OPT_MODE:
strcpy (v, handler->val[n].s);
break;
case OPT_MODE_GROUP:
default:
break;
}
return (SANE_STATUS_GOOD);
}
if (a == SANE_ACTION_SET_VALUE) {
switch (n) {
case OPT_TL_X:
case OPT_TL_Y:
case OPT_BR_X:
case OPT_BR_Y:
case OPT_NUM_OPTS:
case OPT_RESOLUTION:
case OPT_PREVIEW:
case OPT_GRAY_PREVIEW:
handler->val[n].w = *(SANE_Word *) v;
if (i)
*i |= SANE_INFO_RELOAD_PARAMS | SANE_INFO_RELOAD_OPTIONS | SANE_INFO_INEXACT;
break;
case OPT_MODE:
if (handler->val[n].s)
free (handler->val[n].s);
handler->val[n].s = strdup (v);
if (!handler->val[n].s) {
DBG (10, "OPT_MODE allocation failure.\n");
return (SANE_STATUS_NO_MEM);
}
if (i)
*i |= SANE_INFO_RELOAD_PARAMS | SANE_INFO_RELOAD_OPTIONS | SANE_INFO_INEXACT;
break;
default:
break;
}
}
return (SANE_STATUS_GOOD);
}
/**
* \fn SANE_Status sane_start(SANE_Handle h)
* \brief Function that initiates aquisition of an image from the device represented by handle 'h'.
* This function calls the "escl_newjob" function and the "escl_scan" function.
*
* \return status (if everything is OK, status = SANE_STATUS_GOOD, otherwise, SANE_STATUS_NO_MEM/SANE_STATUS_INVAL)
*/
SANE_Status
sane_start(SANE_Handle h)
{
DBG (10, "escl sane_start\n");
SANE_Status status = SANE_STATUS_GOOD;
escl_sane_t *handler = h;
int w = 0;
int he = 0;
int bps = 0;
if (handler->name == NULL)
return (SANE_STATUS_INVAL);
handler->cancel = SANE_FALSE;
handler->write_scan_data = SANE_FALSE;
handler->decompress_scan_data = SANE_FALSE;
handler->end_read = SANE_FALSE;
if(handler->scanner->default_color)
free(handler->scanner->default_color);
if (handler->val[OPT_PREVIEW].w == SANE_TRUE)
{
int i = 0, val = 9999;;
if (handler->val[OPT_GRAY_PREVIEW].w == SANE_TRUE ||
!strncasecmp(handler->val[OPT_MODE].s, SANE_VALUE_SCAN_MODE_GRAY, 3))
handler->scanner->default_color = strdup("Grayscale8");
else
handler->scanner->default_color = strdup("RGB24");
if (!handler->scanner->default_color) {
DBG (10, "Default Color allocation failure.\n");
return (SANE_STATUS_NO_MEM);
}
for (i = 1; i < handler->scanner->SupportedResolutionsSize; i++)
{
if (val > handler->scanner->SupportedResolutions[i])
val = handler->scanner->SupportedResolutions[i];
}
handler->scanner->default_resolution = val;
}
else
{
handler->scanner->default_resolution = handler->val[OPT_RESOLUTION].w;
if (!strncasecmp(handler->val[OPT_MODE].s, SANE_VALUE_SCAN_MODE_GRAY, 3))
handler->scanner->default_color = strdup("Grayscale8");
else
handler->scanner->default_color = strdup("RGB24");
}
handler->scanner->height = MM_TO_PIXEL(handler->val[OPT_BR_Y].w, 300.0);
handler->scanner->width = MM_TO_PIXEL(handler->val[OPT_BR_X].w, 300.0);
handler->scanner->pos_x = MM_TO_PIXEL(handler->val[OPT_TL_X].w, 300.0);
handler->scanner->pos_y = MM_TO_PIXEL(handler->val[OPT_TL_Y].w, 300.0);
DBG(10, "Calculate Size Image [%dx%d|%dx%d]\n",
handler->scanner->pos_x,
handler->scanner->pos_y,
handler->scanner->height,
handler->scanner->width);
if (!handler->scanner->default_color) {
DBG (10, "Default Color allocation failure.\n");
return (SANE_STATUS_NO_MEM);
}
handler->result = escl_newjob(handler->scanner, handler->name, &status);
if (status != SANE_STATUS_GOOD)
return (status);
status = escl_scan(handler->scanner, handler->name, handler->result);
if (status != SANE_STATUS_GOOD)
return (status);
if (!strcmp(handler->scanner->default_format, "image/jpeg"))
{
status = get_JPEG_data(handler->scanner, &w, &he, &bps);
}
else if (!strcmp(handler->scanner->default_format, "image/png"))
{
status = get_PNG_data(handler->scanner, &w, &he, &bps);
}
else if (!strcmp(handler->scanner->default_format, "image/tiff"))
{
status = get_TIFF_data(handler->scanner, &w, &he, &bps);
}
else {
DBG(10, "Unknow image format\n");
return SANE_STATUS_INVAL;
}
DBG(10, "2-Size Image [%dx%d|%dx%d]\n", 0, 0, w, he);
if (status != SANE_STATUS_GOOD)
return (status);
handler->ps.depth = 8;
handler->ps.pixels_per_line = w;
handler->ps.lines = he;
handler->ps.bytes_per_line = w * bps;
handler->ps.last_frame = SANE_TRUE;
handler->ps.format = SANE_FRAME_RGB;
DBG(10, "Real Size Image [%dx%d|%dx%d]\n", 0, 0, w, he);
return (status);
}
/**
* \fn SANE_Status sane_get_parameters(SANE_Handle h, SANE_Parameters *p)
* \brief Function that retrieves the device parameters represented by 'h' and stores them in 'p'.
* This function is normally used after "sane_start".
* It's in this function that we choose to assign the default color. (Color or Monochrome)
*
* \return status (if everything is OK, status = SANE_STATUS_GOOD, otherwise, SANE_STATUS_NO_MEM/SANE_STATUS_INVAL)
*/
SANE_Status
sane_get_parameters(SANE_Handle h, SANE_Parameters *p)
{
DBG (10, "escl sane_get_parameters\n");
SANE_Status status = SANE_STATUS_GOOD;
escl_sane_t *handler = h;
if (status != SANE_STATUS_GOOD)
return (status);
if (p != NULL) {
p->depth = 8;
p->last_frame = SANE_TRUE;
p->format = SANE_FRAME_RGB;
p->pixels_per_line = handler->ps.pixels_per_line;
p->lines = handler->ps.lines;
p->bytes_per_line = handler->ps.bytes_per_line;
}
return (status);
}
/**
* \fn SANE_Status sane_read(SANE_Handle h, SANE_Byte *buf, SANE_Int maxlen, SANE_Int *len)
* \brief Function that's used to read image data from the device represented by handle 'h'.
* The argument 'buf' is a pointer to a memory area that is at least 'maxlen' bytes long.
* The number of bytes returned is stored in '*len'.
* --> When the call succeeds, the number of bytes returned can be anywhere in the range from 0 to 'maxlen' bytes.
*
* \return SANE_STATUS_GOOD (if everything is OK, otherwise, SANE_STATUS_NO_MEM/SANE_STATUS_INVAL)
*/
SANE_Status
sane_read(SANE_Handle h, SANE_Byte *buf, SANE_Int maxlen, SANE_Int *len)
{
DBG (10, "escl sane_read\n");
escl_sane_t *handler = h;
SANE_Status status = SANE_STATUS_GOOD;
long readbyte;
if (!handler | !buf | !len)
return (SANE_STATUS_INVAL);
if (handler->cancel)
return (SANE_STATUS_CANCELLED);
if (!handler->write_scan_data)
handler->write_scan_data = SANE_TRUE;
if (!handler->decompress_scan_data) {
if (status != SANE_STATUS_GOOD)
return (status);
handler->decompress_scan_data = SANE_TRUE;
}
if (handler->scanner->img_data == NULL)
return (SANE_STATUS_INVAL);
if (!handler->end_read) {
readbyte = min((handler->scanner->img_size - handler->scanner->img_read), maxlen);
memcpy(buf, handler->scanner->img_data + handler->scanner->img_read, readbyte);
handler->scanner->img_read = handler->scanner->img_read + readbyte;
*len = readbyte;
if (handler->scanner->img_read == handler->scanner->img_size)
handler->end_read = SANE_TRUE;
else if (handler->scanner->img_read > handler->scanner->img_size) {
*len = 0;
handler->end_read = SANE_TRUE;
free(handler->scanner->img_data);
handler->scanner->img_data = NULL;
return (SANE_STATUS_INVAL);
}
}
else {
*len = 0;
free(handler->scanner->img_data);
handler->scanner->img_data = NULL;
return (SANE_STATUS_EOF);
}
return (SANE_STATUS_GOOD);
}
SANE_Status
sane_get_select_fd(SANE_Handle __sane_unused__ h, SANE_Int __sane_unused__ *fd)
{
return (SANE_STATUS_UNSUPPORTED);
}
SANE_Status
sane_set_io_mode(SANE_Handle __sane_unused__ handle, SANE_Bool __sane_unused__ non_blocking)
{
return (SANE_STATUS_UNSUPPORTED);
}
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