Input: evdev - consolidate compat and regular code
Compat and normal code mirror each other and are hard to maintain.
When EV_SW was added compat_ioctl case was missed. Here is my attempt
at consolidating the code.
Signed-off-by: Dmitry Torokhov <[email protected]>
---
drivers/input/evdev.c | 491 +++++++++++++++++++++-----------------------------
1 files changed, 212 insertions(+), 279 deletions(-)
Index: work/drivers/input/evdev.c
===================================================================
--- work.orig/drivers/input/evdev.c
+++ work/drivers/input/evdev.c
@@ -146,6 +146,7 @@ static int evdev_open(struct inode * ino
}
#ifdef CONFIG_COMPAT
+
struct input_event_compat {
struct compat_timeval time;
__u16 type;
@@ -165,98 +166,107 @@ struct input_event_compat {
# define COMPAT_TEST test_thread_flag(TIF_32BIT)
#endif
-static ssize_t evdev_write_compat(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
+static inline size_t evdev_event_size(void)
{
- struct evdev_list *list = file->private_data;
- struct input_event_compat event;
- int retval = 0;
+ return COMPAT_TEST ?
+ sizeof(struct input_event_compat) : sizeof(struct input_event);
+}
- while (retval < count) {
- if (copy_from_user(&event, buffer + retval, sizeof(struct input_event_compat)))
+static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
+{
+ if (COMPAT_TEST) {
+ struct input_event_compat compat_event;
+
+ if (copy_from_user(&compat_event, buffer, sizeof(struct input_event_compat)))
+ return -EFAULT;
+
+ event->time.tv_sec = compat_event.time.tv_sec;
+ event->time.tv_usec = compat_event.time.tv_usec;
+ event->type = compat_event.type;
+ event->code = compat_event.code;
+ event->value = compat_event.value;
+
+ } else {
+ if (copy_from_user(event, buffer, sizeof(struct input_event)))
return -EFAULT;
- input_event(list->evdev->handle.dev, event.type, event.code, event.value);
- retval += sizeof(struct input_event_compat);
}
- return retval;
+ return 0;
}
-#endif
-static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
+static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
{
- struct evdev_list *list = file->private_data;
- struct input_event event;
- int retval = 0;
+ if (COMPAT_TEST) {
+ struct input_event_compat compat_event;
- if (!list->evdev->exist) return -ENODEV;
+ compat_event.time.tv_sec = event->time.tv_sec;
+ compat_event.time.tv_usec = event->time.tv_usec;
+ compat_event.type = event->type;
+ compat_event.code = event->code;
+ compat_event.value = event->value;
-#ifdef CONFIG_COMPAT
- if (COMPAT_TEST)
- return evdev_write_compat(file, buffer, count, ppos);
-#endif
-
- while (retval < count) {
+ if (copy_to_user(buffer, &compat_event, sizeof(struct input_event_compat)))
+ return -EFAULT;
- if (copy_from_user(&event, buffer + retval, sizeof(struct input_event)))
+ } else {
+ if (copy_to_user(buffer, event, sizeof(struct input_event)))
return -EFAULT;
- input_event(list->evdev->handle.dev, event.type, event.code, event.value);
- retval += sizeof(struct input_event);
}
- return retval;
+ return 0;
}
-#ifdef CONFIG_COMPAT
-static ssize_t evdev_read_compat(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
+#else
+
+static inline size_t evdev_event_size(void)
{
- struct evdev_list *list = file->private_data;
- int retval;
+ return sizeof(struct input_event);
+}
- if (count < sizeof(struct input_event_compat))
- return -EINVAL;
+static int evdev_event_from_user(const char __user *buffer, struct input_event *event)
+{
+ if (copy_from_user(event, buffer, sizeof(struct input_event)))
+ return -EFAULT;
- if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
- return -EAGAIN;
+ return 0;
+}
- retval = wait_event_interruptible(list->evdev->wait,
- list->head != list->tail || (!list->evdev->exist));
+static int evdev_event_to_user(char __user *buffer, const struct input_event *event)
+{
+ if (copy_to_user(buffer, event, sizeof(struct input_event)))
+ return -EFAULT;
- if (retval)
- return retval;
+ return 0;
+}
+
+#endif /* CONFIG_COMPAT */
+
+static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
+{
+ struct evdev_list *list = file->private_data;
+ struct input_event event;
+ int retval = 0;
if (!list->evdev->exist)
return -ENODEV;
- while (list->head != list->tail && retval + sizeof(struct input_event_compat) <= count) {
- struct input_event *event = (struct input_event *) list->buffer + list->tail;
- struct input_event_compat event_compat;
- event_compat.time.tv_sec = event->time.tv_sec;
- event_compat.time.tv_usec = event->time.tv_usec;
- event_compat.type = event->type;
- event_compat.code = event->code;
- event_compat.value = event->value;
+ while (retval < count) {
- if (copy_to_user(buffer + retval, &event_compat,
- sizeof(struct input_event_compat))) return -EFAULT;
- list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
- retval += sizeof(struct input_event_compat);
+ if (evdev_event_from_user(buffer + retval, &event))
+ return -EFAULT;
+ input_event(list->evdev->handle.dev, event.type, event.code, event.value);
+ retval += evdev_event_size();
}
return retval;
}
-#endif
static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
{
struct evdev_list *list = file->private_data;
int retval;
-#ifdef CONFIG_COMPAT
- if (COMPAT_TEST)
- return evdev_read_compat(file, buffer, count, ppos);
-#endif
-
- if (count < sizeof(struct input_event))
+ if (count < evdev_event_size())
return -EINVAL;
if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
@@ -271,11 +281,15 @@ static ssize_t evdev_read(struct file *
if (!list->evdev->exist)
return -ENODEV;
- while (list->head != list->tail && retval + sizeof(struct input_event) <= count) {
- if (copy_to_user(buffer + retval, list->buffer + list->tail,
- sizeof(struct input_event))) return -EFAULT;
+ while (list->head != list->tail && retval + evdev_event_size() <= count) {
+
+ struct input_event *event = (struct input_event *) list->buffer + list->tail;
+
+ if (evdev_event_to_user(buffer + retval, event))
+ return -EFAULT;
+
list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
- retval += sizeof(struct input_event);
+ retval += evdev_event_size();
}
return retval;
@@ -290,17 +304,95 @@ static unsigned int evdev_poll(struct fi
(list->evdev->exist ? 0 : (POLLHUP | POLLERR));
}
-static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+#ifdef CONFIG_COMPAT
+
+#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
+#define NBITS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
+
+#ifdef __BIG_ENDIAN
+static int bits_to_user(unsigned long *bits, unsigned int maxbit,
+ unsigned int maxlen, void __user *p, int compat)
+{
+ int len, i;
+
+ if (compat) {
+ len = NBITS_COMPAT(maxbit) * sizeof(compat_long_t);
+ if (len < maxlen)
+ len = maxlen;
+
+ for (i = 0; i < len / sizeof(compat_long_t); i++)
+ if (copy_to_user((compat_long_t __user *) p + i,
+ (compat_long_t *) bits +
+ i + 1 - ((i % 2) << 1),
+ sizeof(compat_long_t)))
+ return -EFAULT;
+ } else {
+ len = NBITS(maxbit) * sizeof(long);
+ if (len > maxlen)
+ len = maxlen;
+
+ if (copy_to_user(p, bits, len))
+ return -EFAULT;
+ }
+
+ return len;
+}
+#else
+static int bits_to_user(unsigned long *bits, unsigned int maxbit,
+ unsigned int maxlen, void __user *p, int compat)
+{
+ int len = compat ?
+ NBITS_COMPAT(maxbit) * sizeof(compat_long_t) :
+ NBITS(maxbit) * sizeof(long);
+
+ if (len > maxlen)
+ len = maxlen;
+
+ return copy_to_user(p, bits, len) ? -EFAULT : len;
+}
+#endif /* __BIG_ENDIAN */
+
+#else
+
+static int bits_to_user(unsigned long *bits, unsigned int maxbit,
+ unsigned int maxlen, void __user *p, int compat)
+{
+ int len = NBITS(maxbit) * sizeof(long);
+
+ if (len > maxlen)
+ len = maxlen;
+
+ return copy_to_user(p, bits, len) ? -EFAULT : len;
+}
+
+#endif /* CONFIG_COMPAT */
+
+static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
+{
+ int len;
+
+ if (!str)
+ return -ENOENT;
+
+ len = strlen(str) + 1;
+ if (len > maxlen)
+ len = maxlen;
+
+ return copy_to_user(p, str, len) ? -EFAULT : len;
+}
+
+static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
+ void __user *p, int compat_mode)
{
struct evdev_list *list = file->private_data;
struct evdev *evdev = list->evdev;
struct input_dev *dev = evdev->handle.dev;
struct input_absinfo abs;
- void __user *p = (void __user *)arg;
- int __user *ip = (int __user *)arg;
+ int __user *ip = (int __user *)p;
int i, t, u, v;
- if (!evdev->exist) return -ENODEV;
+ if (!evdev->exist)
+ return -ENODEV;
switch (cmd) {
@@ -308,26 +400,39 @@ static long evdev_ioctl(struct file *fil
return put_user(EV_VERSION, ip);
case EVIOCGID:
- return copy_to_user(p, &dev->id, sizeof(struct input_id)) ? -EFAULT : 0;
+ if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
+ return -EFAULT;
+
+ return 0;
case EVIOCGKEYCODE:
- if (get_user(t, ip)) return -EFAULT;
- if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL;
- if (put_user(INPUT_KEYCODE(dev, t), ip + 1)) return -EFAULT;
+ if (get_user(t, ip))
+ return -EFAULT;
+ if (t < 0 || t >= dev->keycodemax || !dev->keycodesize)
+ return -EINVAL;
+ if (put_user(INPUT_KEYCODE(dev, t), ip + 1))
+ return -EFAULT;
return 0;
case EVIOCSKEYCODE:
- if (get_user(t, ip)) return -EFAULT;
- if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL;
- if (get_user(v, ip + 1)) return -EFAULT;
- if (v < 0 || v > KEY_MAX) return -EINVAL;
- if (dev->keycodesize < sizeof(v) && (v >> (dev->keycodesize * 8))) return -EINVAL;
+ if (get_user(t, ip))
+ return -EFAULT;
+ if (t < 0 || t >= dev->keycodemax || !dev->keycodesize)
+ return -EINVAL;
+ if (get_user(v, ip + 1))
+ return -EFAULT;
+ if (v < 0 || v > KEY_MAX)
+ return -EINVAL;
+ if (dev->keycodesize < sizeof(v) && (v >> (dev->keycodesize * 8)))
+ return -EINVAL;
+
u = SET_INPUT_KEYCODE(dev, t, v);
clear_bit(u, dev->keybit);
set_bit(v, dev->keybit);
for (i = 0; i < dev->keycodemax; i++)
- if (INPUT_KEYCODE(dev,i) == u)
+ if (INPUT_KEYCODE(dev, i) == u)
set_bit(u, dev->keybit);
+
return 0;
case EVIOCSFF:
@@ -338,17 +443,17 @@ static long evdev_ioctl(struct file *fil
if (copy_from_user(&effect, p, sizeof(effect)))
return -EFAULT;
err = dev->upload_effect(dev, &effect);
- if (put_user(effect.id, &(((struct ff_effect __user *)arg)->id)))
+ if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
return -EFAULT;
return err;
- }
- else return -ENOSYS;
+ } else
+ return -ENOSYS;
case EVIOCRMFF:
- if (dev->erase_effect) {
- return dev->erase_effect(dev, (int)arg);
- }
- else return -ENOSYS;
+ if (!dev->erase_effect)
+ return -ENOSYS;
+
+ return dev->erase_effect(dev, (int)(unsigned long) p);
case EVIOCGEFFECTS:
if (put_user(dev->ff_effects_max, ip))
@@ -356,7 +461,7 @@ static long evdev_ioctl(struct file *fil
return 0;
case EVIOCGRAB:
- if (arg) {
+ if (p) {
if (evdev->grab)
return -EBUSY;
if (input_grab_device(&evdev->handle))
@@ -395,62 +500,33 @@ static long evdev_ioctl(struct file *fil
case EV_SW: bits = dev->swbit; len = SW_MAX; break;
default: return -EINVAL;
}
- len = NBITS(len) * sizeof(long);
- if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
- return copy_to_user(p, bits, len) ? -EFAULT : len;
+ return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
}
- if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) {
- int len;
- len = NBITS(KEY_MAX) * sizeof(long);
- if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
- return copy_to_user(p, dev->key, len) ? -EFAULT : len;
- }
+ if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
+ return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
+ p, compat_mode);
- if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) {
- int len;
- len = NBITS(LED_MAX) * sizeof(long);
- if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
- return copy_to_user(p, dev->led, len) ? -EFAULT : len;
- }
+ if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
+ return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
+ p, compat_mode);
- if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) {
- int len;
- len = NBITS(SND_MAX) * sizeof(long);
- if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
- return copy_to_user(p, dev->snd, len) ? -EFAULT : len;
- }
+ if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
+ return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
+ p, compat_mode);
- if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) {
- int len;
- len = NBITS(SW_MAX) * sizeof(long);
- if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
- return copy_to_user(p, dev->sw, len) ? -EFAULT : len;
- }
+ if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
+ return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
+ p, compat_mode);
- if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
- int len;
- if (!dev->name) return -ENOENT;
- len = strlen(dev->name) + 1;
- if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
- return copy_to_user(p, dev->name, len) ? -EFAULT : len;
- }
+ if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
+ return str_to_user(dev->name, _IOC_SIZE(cmd), p);
- if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
- int len;
- if (!dev->phys) return -ENOENT;
- len = strlen(dev->phys) + 1;
- if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
- return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
- }
+ if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
+ return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
- if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
- int len;
- if (!dev->uniq) return -ENOENT;
- len = strlen(dev->uniq) + 1;
- if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
- return copy_to_user(p, dev->uniq, len) ? -EFAULT : len;
- }
+ if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
+ return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
@@ -492,158 +568,15 @@ static long evdev_ioctl(struct file *fil
return -EINVAL;
}
-#ifdef CONFIG_COMPAT
-
-#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
-#define NBITS_COMPAT(x) ((((x)-1)/BITS_PER_LONG_COMPAT)+1)
-#define OFF_COMPAT(x) ((x)%BITS_PER_LONG_COMPAT)
-#define BIT_COMPAT(x) (1UL<<OFF_COMPAT(x))
-#define LONG_COMPAT(x) ((x)/BITS_PER_LONG_COMPAT)
-#define test_bit_compat(bit, array) ((array[LONG_COMPAT(bit)] >> OFF_COMPAT(bit)) & 1)
-
-#ifdef __BIG_ENDIAN
-#define bit_to_user(bit, max) \
-do { \
- int i; \
- int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \
- if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \
- for (i = 0; i < len / sizeof(compat_long_t); i++) \
- if (copy_to_user((compat_long_t __user *) p + i, \
- (compat_long_t*) (bit) + i + 1 - ((i % 2) << 1), \
- sizeof(compat_long_t))) \
- return -EFAULT; \
- return len; \
-} while (0)
-#else
-#define bit_to_user(bit, max) \
-do { \
- int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \
- if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \
- return copy_to_user(p, (bit), len) ? -EFAULT : len; \
-} while (0)
-#endif
+static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
+}
+#ifdef CONFIG_COMPAT
static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
{
- struct evdev_list *list = file->private_data;
- struct evdev *evdev = list->evdev;
- struct input_dev *dev = evdev->handle.dev;
- struct input_absinfo abs;
- void __user *p = compat_ptr(arg);
-
- if (!evdev->exist) return -ENODEV;
-
- switch (cmd) {
-
- case EVIOCGVERSION:
- case EVIOCGID:
- case EVIOCGKEYCODE:
- case EVIOCSKEYCODE:
- case EVIOCSFF:
- case EVIOCRMFF:
- case EVIOCGEFFECTS:
- case EVIOCGRAB:
- return evdev_ioctl(file, cmd, (unsigned long) p);
-
- default:
-
- if (_IOC_TYPE(cmd) != 'E')
- return -EINVAL;
-
- if (_IOC_DIR(cmd) == _IOC_READ) {
-
- if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
- long *bits;
- int max;
-
- switch (_IOC_NR(cmd) & EV_MAX) {
- case 0: bits = dev->evbit; max = EV_MAX; break;
- case EV_KEY: bits = dev->keybit; max = KEY_MAX; break;
- case EV_REL: bits = dev->relbit; max = REL_MAX; break;
- case EV_ABS: bits = dev->absbit; max = ABS_MAX; break;
- case EV_MSC: bits = dev->mscbit; max = MSC_MAX; break;
- case EV_LED: bits = dev->ledbit; max = LED_MAX; break;
- case EV_SND: bits = dev->sndbit; max = SND_MAX; break;
- case EV_FF: bits = dev->ffbit; max = FF_MAX; break;
- case EV_SW: bits = dev->swbit; max = SW_MAX; break;
- default: return -EINVAL;
- }
- bit_to_user(bits, max);
- }
-
- if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
- bit_to_user(dev->key, KEY_MAX);
-
- if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
- bit_to_user(dev->led, LED_MAX);
-
- if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
- bit_to_user(dev->snd, SND_MAX);
-
- if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
- bit_to_user(dev->sw, SW_MAX);
-
- if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
- int len;
- if (!dev->name) return -ENOENT;
- len = strlen(dev->name) + 1;
- if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
- return copy_to_user(p, dev->name, len) ? -EFAULT : len;
- }
-
- if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
- int len;
- if (!dev->phys) return -ENOENT;
- len = strlen(dev->phys) + 1;
- if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
- return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
- }
-
- if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
- int len;
- if (!dev->uniq) return -ENOENT;
- len = strlen(dev->uniq) + 1;
- if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
- return copy_to_user(p, dev->uniq, len) ? -EFAULT : len;
- }
-
- if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
-
- int t = _IOC_NR(cmd) & ABS_MAX;
-
- abs.value = dev->abs[t];
- abs.minimum = dev->absmin[t];
- abs.maximum = dev->absmax[t];
- abs.fuzz = dev->absfuzz[t];
- abs.flat = dev->absflat[t];
-
- if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
- return -EFAULT;
-
- return 0;
- }
- }
-
- if (_IOC_DIR(cmd) == _IOC_WRITE) {
-
- if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
-
- int t = _IOC_NR(cmd) & ABS_MAX;
-
- if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
- return -EFAULT;
-
- dev->abs[t] = abs.value;
- dev->absmin[t] = abs.minimum;
- dev->absmax[t] = abs.maximum;
- dev->absfuzz[t] = abs.fuzz;
- dev->absflat[t] = abs.flat;
-
- return 0;
- }
- }
- }
- return -EINVAL;
+ return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
}
#endif
-
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