Currently struct boot_img_hdr (a.k.a. BootImage) in librz/bin/p/bin_bootimg.c uses RZ_PACKED.

The idea is to rewrite the load_buffer function to not call rz_buf_read_at but instead use the rz_buf_offset_* APIs.

Also this plugins is probably missing tests, which should be added to the test suite.

how to use the RzBuffer api.

Define a structure in a normal way (so no RZ_PACKED, etc...):

typedef struct foo_s {
   ut32 num32;
   char name[10];
   ....
   ut16 val16;
} foo_t;

Then you use the offset API that i mention:

static bool parse_foo(RzBuffer *b, foo_t *foo, bool big_endian) {
    ut64 offset = 0;
    return rz_buf_read_ble32_offset(b, &offset, &foo->num32, big_endian) &&
               rz_buf_read_offset(b, &offset, foo->name, sizepf(foo->name)) &&
               ...
              rz_buf_read_ble16_offset(b, &offset, &foo->val16, big_endian) ;
}

This parses the same structure as the packed one via memcpy(foo, buffer, sizeof(foo)); but is portable.

Real world example: