Function Format40_Decode

src/codec/format40.c:14–60

* Decode a memory fragment which is encoded with 'format40'. * @param dst The place the decoded fragment will be loaded. * @param src The encoded fragment. */

 * @param src The encoded fragment.
 */
void Format40_Decode(uint8 *dst, uint8 *src)
{
	uint16 cmd;
	uint16 count;

	for (;;) {
		cmd = *src++;	/* 8 bit command code */

		if (cmd == 0) {
			/* XOR with value */
			for (count = *src++; count > 0; count--) {
				*dst++ ^= *src;
			}
			src++;
		} else if ((cmd & 0x80) == 0) {
			/* XOR with string */
			for (count = cmd; count > 0; count--) {
				*dst++ ^= *src++;
			}
		} else if (cmd != 0x80) {
			/* skip bytes */
			dst += (cmd & 0x7F);
		} else {
			/* last byte was 0x80 : read 16 bit value */
			cmd = *src++;
			cmd += (*src++) << 8;

			if (cmd == 0) break;	/* 0x80 0x00 0x00 => exit code */

			if ((cmd & 0x8000) == 0) {
				/* skip bytes */
				dst += cmd;
			} else if ((cmd & 0x4000) == 0) {
				/* XOR with string */
				for (count = cmd & 0x3FFF; count > 0; count--) {
					*dst++ ^= *src++;
				}
			} else {
				/* XOR with value */
				for (count = cmd & 0x3FFF; count > 0; count--) {
					*dst++ ^= *src;
				}
				src++;
			}
		}
	}
}


/**