On Wed, Dec 08, 2021 at 06:00:55PM +0100, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal@xxxxxxxxxx>
>
> FT is sometimes used for storing raw data. That is quite common for
> U-Boot FIT images.
>
> Extracting such data is not trivial currently. Using type 's' (string)
> will replace every 0x00 (NUL) with 0x20 (space). Using type 'x' will
> print bytes but in xxd incompatible format.
>
> This commit adds support for 'b' (binary) format. Example usage:
> fdtget -t b firmware.itb /images/foo data > image.raw
>
> Support for encoding isn't added as there isn't any clean way of passing
> binary data as command line argument.
>
> Signed-off-by: Rafał Miłecki <rafal@xxxxxxxxxx>
> ---
> V2: Update usage info & add tests
>
> Alternatively I could use e.g. "r" (raw) instead of "b" (binary) if you
> find it more accurate. Please let me know.
> ---
> Documentation/manual.txt | 2 +-
> fdtget.c | 5 +++++
> fdtput.c | 2 ++
> tests/run_tests.sh | 2 ++
> tests/utilfdt_test.c | 5 ++++-
> util.c | 21 +++++++++++----------
> util.h | 3 ++-
> 7 files changed, 27 insertions(+), 13 deletions(-)
>
> diff --git a/Documentation/manual.txt b/Documentation/manual.txt
> index 97e53b9..73e0593 100644
> --- a/Documentation/manual.txt
> +++ b/Documentation/manual.txt
> @@ -712,7 +712,7 @@ The syntax of the fdtget command is:
>
> where options are:
>
> - <type> s=string, i=int, u=unsigned, x=hex
> + <type> s=string, i=int, u=unsigned, x=hex, b=binary
> Optional modifier prefix:
> hh or b=byte, h=2 byte, l=4 byte (default)
I don't think using "b" as both a type specifier, and a length
modifier is a good idea. You can probably disambiguate them in
parsing, but it's still likely to cause confusion.
How about "r" for "raw"?
>
> diff --git a/fdtget.c b/fdtget.c
> index 54fc6a0..6e4abf1 100644
> --- a/fdtget.c
> +++ b/fdtget.c
> @@ -97,6 +97,11 @@ static int show_data(struct display_info *disp, const char *data, int len)
> if (len == 0)
> return 0;
>
> + if (disp->type == 'b') {
> + fwrite(data, 1, len, stdout);
> + return 0;
> + }
> +
> is_string = (disp->type) == 's' ||
> (!disp->type && util_is_printable_string(data, len));
> if (is_string) {
> diff --git a/fdtput.c b/fdtput.c
> index 428745a..99b0bf9 100644
> --- a/fdtput.c
> +++ b/fdtput.c
> @@ -433,6 +433,8 @@ int main(int argc, char *argv[])
> if (utilfdt_decode_type(optarg, &disp.type,
> &disp.size))
> usage("Invalid type string");
> + if (disp.type == 'b')
> + usage("Unsupported binary data type");
> break;
>
> case 'v':
> diff --git a/tests/run_tests.sh b/tests/run_tests.sh
> index d100d5a..484be18 100755
> --- a/tests/run_tests.sh
> +++ b/tests/run_tests.sh
> @@ -855,6 +855,8 @@ fdtget_tests () {
> run_fdtget_test 8000 -tx $dtb /cpus/PowerPC,970@1 d-cache-size
> run_fdtget_test "61 62 63 0" -tbx $dtb /randomnode tricky1
> run_fdtget_test "a b c d de ea ad be ef" -tbx $dtb /randomnode blob
> + run_fdtget_test "MyBoardName\0MyBoardFamilyName\0" -tb $dtb / compatible
> + run_fdtget_test "\x0a\x0b\x0c\x0d\xde\xea\xad\xbe\xef" -tb $dtb /randomnode blob
>
> # Here the property size is not a multiple of 4 bytes, so it should fail
> run_wrap_error_test $DTGET -tlx $dtb /randomnode mixed
> diff --git a/tests/utilfdt_test.c b/tests/utilfdt_test.c
> index c621759..906f250 100644
> --- a/tests/utilfdt_test.c
> +++ b/tests/utilfdt_test.c
> @@ -73,6 +73,9 @@ static void check_sizes(char *modifier, int expected_size)
>
> *ptr = 's';
> check(fmt, 's', -1);
> +
> + *ptr = 'b';
> + check(fmt, 'b', -1);
> }
>
> static void test_utilfdt_decode_type(void)
> @@ -90,7 +93,7 @@ static void test_utilfdt_decode_type(void)
> /* try every other character */
> checkfail("");
> for (ch = ' '; ch < 127; ch++) {
> - if (!strchr("iuxs", ch)) {
> + if (!strchr("iuxsb", ch)) {
> *fmt = ch;
> fmt[1] = '\0';
> checkfail(fmt);
> diff --git a/util.c b/util.c
> index 40274fb..b9e88f1 100644
> --- a/util.c
> +++ b/util.c
> @@ -340,24 +340,25 @@ int utilfdt_decode_type(const char *fmt, int *type, int *size)
>
> /* get the conversion qualifier */
> *size = -1;
> - if (strchr("hlLb", *fmt)) {
> - qualifier = *fmt++;
> - if (qualifier == *fmt) {
> - switch (*fmt++) {
> -/* TODO: case 'l': qualifier = 'L'; break;*/
> - case 'h':
> + for (; *(fmt + 1); fmt++) {
> + if (!strchr("hlLb", *fmt))
> + return -1;
> + if (qualifier) {
> + if (*fmt == 'h' && qualifier == 'h')
> qualifier = 'b';
> - break;
> - }
> + else
> + return -1;
> + } else {
> + qualifier = *fmt;
> }
> }
>
> /* we should now have a type */
> - if ((*fmt == '\0') || !strchr("iuxs", *fmt))
> + if (!strchr("iuxsb", *fmt))
> return -1;
>
> /* convert qualifier (bhL) to byte size */
> - if (*fmt != 's')
> + if (*fmt != 's' && *fmt != 'b')
> *size = qualifier == 'b' ? 1 :
> qualifier == 'h' ? 2 :
> qualifier == 'l' ? 4 : -1;
> diff --git a/util.h b/util.h
> index c45b2c2..fa381fc 100644
> --- a/util.h
> +++ b/util.h
> @@ -143,6 +143,7 @@ int utilfdt_write_err(const char *filename, const void *blob);
> * i signed integer
> * u unsigned integer
> * x hex
> + * b binary
> *
> * TODO: Implement ll modifier (8 bytes)
> * TODO: Implement o type (octal)
> @@ -160,7 +161,7 @@ int utilfdt_decode_type(const char *fmt, int *type, int *size);
> */
>
> #define USAGE_TYPE_MSG \
> - "<type>\ts=string, i=int, u=unsigned, x=hex\n" \
> + "<type>\ts=string, i=int, u=unsigned, x=hex, b=binary\n" \
> "\tOptional modifier prefix:\n" \
> "\t\thh or b=byte, h=2 byte, l=4 byte (default)";
>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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