Make yourself an assembler file, blob.S:
.global blob
.global blob_size
.section .rodata
blob:
.incbin "blob.bin"
1:
blob_size:
.int 1b - blob
Compile with gcc -c blob.S -o blob.o
The blob can now be accessed from within your C program with:
extern uint8_t blob[];
extern int blob_size;
Using a bin2c converter usually works fine, but if the blob is large, the incbin solution is much faster, and uses much less memory (compile time)