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edid: add di_edid_format()

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Signed-off-by: Simon Ser <contact@emersion.fr>
This commit is contained in:
Simon Ser 2023-04-14 12:54:10 +02:00
parent 6df26fb327
commit bed829366e
2 changed files with 38 additions and 0 deletions
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25
edid.c
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@ -1707,3 +1707,28 @@ error:
di_edid_destroy(copy); di_edid_destroy(copy);
return NULL; return NULL;
} }
ssize_t
di_edid_format(const struct di_edid *edid, void *buf, size_t buf_size)
{
size_t size;
uint8_t *data;
size = EDID_BLOCK_SIZE * (1 + edid->exts_len);
if (buf == NULL) {
return (ssize_t) size;
} else if (buf_size < size) {
return -1;
}
memset(buf, 0, size);
data = buf;
memcpy(data, header, sizeof(header));
data[0x12] = (uint8_t) edid->version;
data[0x13] = (uint8_t) edid->revision;
/* TODO */
return (ssize_t) size;
}

13
include/libdisplay-info/edid.h
View file

@ -12,6 +12,7 @@
#include <stdbool.h> #include <stdbool.h>
#include <stddef.h> #include <stddef.h>
#include <stdint.h> #include <stdint.h>
#include <sys/types.h>
/** /**
* EDID data structure. * EDID data structure.
@ -33,6 +34,18 @@ di_edid_destroy(struct di_edid *edid);
struct di_edid * struct di_edid *
di_edid_dup(const struct di_edid *edid); di_edid_dup(const struct di_edid *edid);
/**
* Format an EDID.
*
* If buf is NULL, the size of the EDID is returned without writing the EDID.
* If buf is not NULL, buf_size must be its capacity in bytes.
*
* On success, the size of the EDID in bytes is returned. On error, a negative
* integer is returned.
*/
ssize_t
di_edid_format(const struct di_edid *edid, void *buf, size_t buf_size);
/** /**
* Get the EDID version. * Get the EDID version.
*/ */