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sane-backends/0001-epson2-Rewrite-network-I-O.patch

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diff -up sane-backends-1.0.27/backend/epson2_net.c.epsonds-issues sane-backends-1.0.27/backend/epson2_net.c
--- sane-backends-1.0.27/backend/epson2_net.c.epsonds-issues 2016-10-06 02:02:57.000000000 +0200
+++ sane-backends-1.0.27/backend/epson2_net.c 2020-07-28 15:04:58.385405722 +0200
@@ -32,11 +32,12 @@
#include "sane/sanei_debug.h"
-static int
+static ssize_t
sanei_epson_net_read_raw(Epson_Scanner *s, unsigned char *buf, ssize_t wanted,
SANE_Status *status)
{
- int ready, read = -1;
+ int ready;
+ ssize_t read = -1;
fd_set readable;
struct timeval tv;
@@ -62,111 +63,136 @@ sanei_epson_net_read_raw(Epson_Scanner *
return read;
}
-int
-sanei_epson_net_read(Epson_Scanner *s, unsigned char *buf, ssize_t wanted,
+static ssize_t
+sanei_epson_net_read_buf(Epson_Scanner *s, unsigned char *buf, ssize_t wanted,
SANE_Status * status)
{
- ssize_t size;
ssize_t read = 0;
- unsigned char header[12];
- /* read from buffer, if available */
- if (s->netptr != s->netbuf) {
- DBG(23, "reading %lu from buffer at %p, %lu available\n",
- (u_long) wanted, s->netptr, (u_long) s->netlen);
+ DBG(23, "%s: reading up to %lu from buffer at %p, %lu available\n",
+ __func__, (u_long) wanted, s->netptr, (u_long) s->netlen);
- memcpy(buf, s->netptr, wanted);
- read = wanted;
+ if ((size_t) wanted > s->netlen) {
+ *status = SANE_STATUS_IO_ERROR;
+ wanted = s->netlen;
+ }
- s->netlen -= wanted;
+ memcpy(buf, s->netptr, wanted);
+ read = wanted;
- if (s->netlen == 0) {
- DBG(23, "%s: freeing %p\n", __func__, s->netbuf);
- free(s->netbuf);
- s->netbuf = s->netptr = NULL;
- s->netlen = 0;
- }
+ s->netptr += read;
+ s->netlen -= read;
- return read;
+ if (s->netlen == 0) {
+ DBG(23, "%s: freeing %p\n", __func__, s->netbuf);
+ free(s->netbuf);
+ s->netbuf = s->netptr = NULL;
+ s->netlen = 0;
+ }
+
+ return read;
+}
+
+ssize_t
+sanei_epson_net_read(Epson_Scanner *s, unsigned char *buf, ssize_t wanted,
+ SANE_Status * status)
+{
+ if (wanted < 0) {
+ *status = SANE_STATUS_INVAL;
+ return 0;
+ }
+
+ size_t size;
+ ssize_t read = 0;
+ unsigned char header[12];
+
+ /* read from remainder of buffer */
+ if (s->netptr) {
+ return sanei_epson_net_read_buf(s, buf, wanted, status);
}
/* receive net header */
- size = sanei_epson_net_read_raw(s, header, 12, status);
- if (size != 12) {
+ read = sanei_epson_net_read_raw(s, header, 12, status);
+ if (read != 12) {
return 0;
}
+ /* validate header */
if (header[0] != 'I' || header[1] != 'S') {
DBG(1, "header mismatch: %02X %02x\n", header[0], header[1]);
*status = SANE_STATUS_IO_ERROR;
return 0;
}
+ /* parse payload size */
size = be32atoh(&header[6]);
- DBG(23, "%s: wanted = %lu, available = %lu\n", __func__,
- (u_long) wanted, (u_long) size);
-
*status = SANE_STATUS_GOOD;
- if (size == wanted) {
-
- DBG(15, "%s: full read\n", __func__);
+ if (!s->netbuf) {
+ DBG(15, "%s: direct read\n", __func__);
+ DBG(23, "%s: wanted = %lu, available = %lu\n", __func__,
+ (u_long) wanted, (u_long) size);
- read = sanei_epson_net_read_raw(s, buf, size, status);
-
- if (s->netbuf) {
- free(s->netbuf);
- s->netbuf = NULL;
- s->netlen = 0;
+ if ((size_t) wanted > size) {
+ wanted = size;
}
- if (read < 0) {
- return 0;
- }
-
-/* } else if (wanted < size && s->netlen == size) { */
+ read = sanei_epson_net_read_raw(s, buf, wanted, status);
} else {
- DBG(23, "%s: partial read\n", __func__);
+ DBG(15, "%s: buffered read\n", __func__);
+ DBG(23, "%s: bufferable = %lu, available = %lu\n", __func__,
+ (u_long) s->netlen, (u_long) size);
- read = sanei_epson_net_read_raw(s, s->netbuf, size, status);
- if (read != size) {
- return 0;
+ if (s->netlen > size) {
+ s->netlen = size;
}
- s->netlen = size - wanted;
- s->netptr += wanted;
- read = wanted;
-
- DBG(23, "0,4 %02x %02x\n", s->netbuf[0], s->netbuf[4]);
- DBG(23, "storing %lu to buffer at %p, next read at %p, %lu bytes left\n",
- (u_long) size, s->netbuf, s->netptr, (u_long) s->netlen);
+ /* fill buffer */
+ read = sanei_epson_net_read_raw(s, s->netbuf, s->netlen, status);
+ s->netptr = s->netbuf;
+ s->netlen = (read > 0 ? read : 0);
- memcpy(buf, s->netbuf, wanted);
+ /* copy wanted part */
+ read = sanei_epson_net_read_buf(s, buf, wanted, status);
}
return read;
}
-
-int
+size_t
sanei_epson_net_write(Epson_Scanner *s, unsigned int cmd, const unsigned char *buf,
size_t buf_size, size_t reply_len, SANE_Status *status)
{
unsigned char *h1, *h2, *payload;
unsigned char *packet = malloc(12 + 8 + buf_size);
- /* XXX check allocation failure */
+ if (!packet) {
+ *status = SANE_STATUS_NO_MEM;
+ return 0;
+ }
h1 = packet;
h2 = packet + 12;
payload = packet + 12 + 8;
if (reply_len) {
- s->netbuf = s->netptr = malloc(reply_len);
+ if (s->netbuf) {
+ DBG(23, "%s, freeing %p, %ld bytes unprocessed\n",
+ __func__, s->netbuf, (u_long) s->netlen);
+ free(s->netbuf);
+ s->netbuf = s->netptr = NULL;
+ s->netlen = 0;
+ }
+ s->netbuf = malloc(reply_len);
+ if (!s->netbuf) {
+ free(packet);
+ *status = SANE_STATUS_NO_MEM;
+ return 0;
+ }
s->netlen = reply_len;
- DBG(24, "allocated %lu bytes at %p\n",
- (u_long) reply_len, s->netbuf);
+ DBG(24, "%s: allocated %lu bytes at %p\n", __func__,
+ (u_long) s->netlen, s->netbuf);
}
DBG(24, "%s: cmd = %04x, buf = %p, buf_size = %lu, reply_len = %lu\n",
diff -up sane-backends-1.0.27/backend/epson2_net.h.epsonds-issues sane-backends-1.0.27/backend/epson2_net.h
--- sane-backends-1.0.27/backend/epson2_net.h.epsonds-issues 2016-10-06 02:02:57.000000000 +0200
+++ sane-backends-1.0.27/backend/epson2_net.h 2020-07-28 14:51:59.666593530 +0200
@@ -4,9 +4,9 @@
#include <sys/types.h>
#include "../include/sane/sane.h"
-extern int sanei_epson_net_read(struct Epson_Scanner *s, unsigned char *buf, ssize_t buf_size,
+extern ssize_t sanei_epson_net_read(struct Epson_Scanner *s, unsigned char *buf, ssize_t buf_size,
SANE_Status *status);
-extern int sanei_epson_net_write(struct Epson_Scanner *s, unsigned int cmd, const unsigned char *buf,
+extern size_t sanei_epson_net_write(struct Epson_Scanner *s, unsigned int cmd, const unsigned char *buf,
size_t buf_size, size_t reply_len,
SANE_Status *status);
extern SANE_Status sanei_epson_net_lock(struct Epson_Scanner *s);
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