1 // SPDX-License-Identifier: MIT 2 #include "hdmi.h" 3 4 void pack_hdmi_infoframe(struct packed_hdmi_infoframe *packed_frame, 5 u8 *raw_frame, ssize_t len) 6 { 7 u32 header = 0; 8 u32 subpack0_low = 0; 9 u32 subpack0_high = 0; 10 u32 subpack1_low = 0; 11 u32 subpack1_high = 0; 12 13 switch (len) { 14 /* 15 * "When in doubt, use brute force." 16 * -- Ken Thompson. 17 */ 18 default: 19 /* 20 * We presume that no valid frame is longer than 17 21 * octets, including header... And truncate to that 22 * if it's longer. 23 */ 24 case 17: 25 subpack1_high = (raw_frame[16] << 16); 26 /* fall through */ 27 case 16: 28 subpack1_high |= (raw_frame[15] << 8); 29 /* fall through */ 30 case 15: 31 subpack1_high |= raw_frame[14]; 32 /* fall through */ 33 case 14: 34 subpack1_low = (raw_frame[13] << 24); 35 /* fall through */ 36 case 13: 37 subpack1_low |= (raw_frame[12] << 16); 38 /* fall through */ 39 case 12: 40 subpack1_low |= (raw_frame[11] << 8); 41 /* fall through */ 42 case 11: 43 subpack1_low |= raw_frame[10]; 44 /* fall through */ 45 case 10: 46 subpack0_high = (raw_frame[9] << 16); 47 /* fall through */ 48 case 9: 49 subpack0_high |= (raw_frame[8] << 8); 50 /* fall through */ 51 case 8: 52 subpack0_high |= raw_frame[7]; 53 /* fall through */ 54 case 7: 55 subpack0_low = (raw_frame[6] << 24); 56 /* fall through */ 57 case 6: 58 subpack0_low |= (raw_frame[5] << 16); 59 /* fall through */ 60 case 5: 61 subpack0_low |= (raw_frame[4] << 8); 62 /* fall through */ 63 case 4: 64 subpack0_low |= raw_frame[3]; 65 /* fall through */ 66 case 3: 67 header = (raw_frame[2] << 16); 68 /* fall through */ 69 case 2: 70 header |= (raw_frame[1] << 8); 71 /* fall through */ 72 case 1: 73 header |= raw_frame[0]; 74 /* fall through */ 75 case 0: 76 break; 77 } 78 79 packed_frame->header = header; 80 packed_frame->subpack0_low = subpack0_low; 81 packed_frame->subpack0_high = subpack0_high; 82 packed_frame->subpack1_low = subpack1_low; 83 packed_frame->subpack1_high = subpack1_high; 84 } 85