Hello, thank you for spending your time helping to make Debian better with this bug report.
Am Donnerstag, dem 23.05.2024 um 09:04 +0000 schrieb Ceppo:
> Package: sane-utils
> Version: 1.3.0-1
> Severity: normal
>
>
> Sumary: man says --buffer-size gets a value in KB, but scanimage actually
> assumes it is MB.
>
>
>
> Today I tried to scan with a command that used to work until last week (when I
> updated sane-utils from 1.2.1-7+b3 to 1.3.0-1) and got an error:
>
> ceppo@mypc:~/Pictures/scan$ scanimage --format=png --output-file=out.png --
> resolution=300 --mode=Color
> [07:57:39.150351] [hp5590] hp5590_bulk_read: USB-in-USB: buffer too small
> scanimage: sane_read: Out of memory
>
> So I tried to increase the buffer size. man says
>
> -B [size], --buffer-size=size
> changes input buffer size from the default of 1MB to size KB.
>
> and usually my scans are around 4MB each, so I tried to increase the buffer
> size to 5MB with --buffer-size=5000:
>
> ceppo@mypc:~/Pictures/scan$ scanimage --format=png --output-
> file=out.png --resolution=300 --mode=Color --buffer-size=5000
> [07:58:34.930476] [hp5590] Data requested won't fit in the bulk read
> buffer (requested: 5117850, buffer size: 1048576
> scanimage: sane_read: Out of memory
>
> I assumed the output message uses bytes, therefore complaining about me
> requesting a 5GB buffer. So I tried --buffer-size=5 and I got my scan (4.5MB).
>
The parameters -B or --buffer-size are read in with the following code:
[quote]
case 'B':
buffer_size = 1024 * atoi(optarg);
[\quote]
The buffer is created with the following code:
[quote]
buffer = malloc (buffer_size);
[/quote]
This means that the size of the buffer is correct according to the
specifications
The error message "[hp5590] Data requested won't fit in the bulk read buffer
(requested: 5117850, buffer size: 1048576" comes from the backend hp5590
[quote]
/* Check if requested data would fit into the buffer */
if (size > bulk_read_state->buffer_size)
{
DBG (DBG_err, "Data requested won't fit in the bulk read buffer "
"(requested: %u, buffer size: %u\n", size,
bulk_read_state->buffer_size);
return SANE_STATUS_NO_MEM;
}
[/quote]
bulk_read_state->buffer_size is created with the following code:
[quote]
bulk_read_state->buffer_size = ALLOCATE_BULK_READ_PAGES
* BULK_READ_PAGE_SIZE;
[/quote]
IMHO this buffer is only used to temporarily store a scanned line and the size
is determined via
[quote]
#define ALLOCATE_BULK_READ_PAGES 16 /* 16 * 65536 = 1Mb */
#define BULK_READ_PAGE_SIZE 0x10000
[/quote]
> I don't know what's the expected behaviour, but of course doc and actual
> behaviour should be consistent.
>
Conclusion:
The buffer in scanimage is created in the correct size. The documentation
corresponds to the calculation (kB).
The error is probably in the backend hp5990. Please contact the developers
directly[1][2].
> Cheers,
>
>
> --
> Ceppo
CU
Jörg
[1] Mailinglist sane-de...@alioth-lists.debian.net
[2] https://gitlab.com/sane-project/backends/-/issues
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