2 * Copyright (c) 2005-2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
\r
3 * Redistribution and modifications are permitted subject to BSD license.
\r
8 #include <asn_system.h> /* Platform-specific types */
\r
15 * This structure describes a position inside an incoming PER bit stream.
\r
17 typedef struct asn_bit_data_s {
\r
18 const uint8_t *buffer; /* Pointer to the octet stream */
\r
19 size_t nboff; /* Bit offset to the meaningful bit */
\r
20 size_t nbits; /* Number of bits in the stream */
\r
21 size_t moved; /* Number of bits moved through this bit stream */
\r
22 int (*refill)(struct asn_bit_data_s *);
\r
27 * Create a contiguous non-refillable bit data structure.
\r
28 * Can be freed by FREEMEM().
\r
30 asn_bit_data_t *asn_bit_data_new_contiguous(const void *data, size_t size_bits);
\r
33 * Extract a small number of bits (<= 31) from the specified PER data pointer.
\r
34 * This function returns -1 if the specified number of bits could not be
\r
35 * extracted due to EOD or other conditions.
\r
37 int32_t asn_get_few_bits(asn_bit_data_t *, int get_nbits);
\r
39 /* Undo the immediately preceeding "get_few_bits" operation */
\r
40 void asn_get_undo(asn_bit_data_t *, int get_nbits);
\r
43 * Extract a large number of bits from the specified PER data pointer.
\r
44 * This function returns -1 if the specified number of bits could not be
\r
45 * extracted due to EOD or other conditions.
\r
47 int asn_get_many_bits(asn_bit_data_t *, uint8_t *dst, int right_align,
\r
50 /* Non-thread-safe debugging function, don't use it */
\r
51 char *asn_bit_data_string(asn_bit_data_t *);
\r
54 * This structure supports forming bit output.
\r
56 typedef struct asn_bit_outp_s {
\r
57 uint8_t *buffer; /* Pointer into the (tmpspace) */
\r
58 size_t nboff; /* Bit offset to the meaningful bit */
\r
59 size_t nbits; /* Number of bits left in (tmpspace) */
\r
60 uint8_t tmpspace[32]; /* Preliminary storage to hold data */
\r
61 int (*output)(const void *data, size_t size, void *op_key);
\r
62 void *op_key; /* Key for (output) data callback */
\r
63 size_t flushed_bytes; /* Bytes already flushed through (output) */
\r
66 /* Output a small number of bits (<= 31) */
\r
67 int asn_put_few_bits(asn_bit_outp_t *, uint32_t bits, int obits);
\r
69 /* Output a large number of bits */
\r
70 int asn_put_many_bits(asn_bit_outp_t *, const uint8_t *src, int put_nbits);
\r
73 * Flush whole bytes (0 or more) through (outper) member.
\r
74 * The least significant bits which are not used are guaranteed to be set to 0.
\r
75 * Returns -1 if callback returns -1. Otherwise, 0.
\r
77 int asn_put_aligned_flush(asn_bit_outp_t *);
\r
83 #endif /* ASN_BIT_DATA */
\r