+ uint8_t *buffer = _buffer;
+
+ if ((num == 32) && (first == 0)) {
+ buffer[3] = (value >> 24) & 0xff;
+ buffer[2] = (value >> 16) & 0xff;
+ buffer[1] = (value >> 8) & 0xff;
+ buffer[0] = (value >> 0) & 0xff;
+ } else if ((num == 64) && (first == 0)) {
+ buffer[7] = (value >> 56) & 0xff;
+ buffer[6] = (value >> 48) & 0xff;
+ buffer[5] = (value >> 40) & 0xff;
+ buffer[4] = (value >> 32) & 0xff;
+ buffer[3] = (value >> 24) & 0xff;
+ buffer[2] = (value >> 16) & 0xff;
+ buffer[1] = (value >> 8) & 0xff;
+ buffer[0] = (value >> 0) & 0xff;
+ } else {
+ for (unsigned i = first; i < first + num; i++) {
+ if (((value >> (i - first)) & 1) == 1)
+ buffer[i / 8] |= 1 << (i % 8);
+ else
+ buffer[i / 8] &= ~(1 << (i % 8));
+ }
+ }
+}
+
+/**
+ * Retrieves @c num bits from @c _buffer, starting at the @c first bit,
+ * returning the bits in a 32-bit word. This routine fast-paths reads
+ * of little-endian, byte-aligned, 32-bit words.
+ * @param _buffer The buffer whose bits will be read.
+ * @param first The bit offset in @c _buffer to start reading (0-31).
+ * @param num The number of bits from @c _buffer to read (1-32).
+ * @returns Up to 32-bits that were read from @c _buffer.
+ */
+static inline uint32_t buf_get_u32(const uint8_t *_buffer,
+ unsigned first, unsigned num)
+{
+ const uint8_t *buffer = _buffer;
+
+ if ((num == 32) && (first == 0)) {
+ return (((uint32_t)buffer[3]) << 24) |
+ (((uint32_t)buffer[2]) << 16) |
+ (((uint32_t)buffer[1]) << 8) |
+ (((uint32_t)buffer[0]) << 0);
+ } else {