Port to CMake, get rid of os_int.h.

[stg.git] / libs / smux / include / stg / per_support.h

diff --git a/libs/smux/include/stg/per_support.h b/libs/smux/include/stg/per_support.h
new file mode 100644 (file)
index 0000000..420bb83
--- /dev/null
+++ b/libs/smux/include/stg/per_support.h
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2005, 2006 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#ifndef        _PER_SUPPORT_H_
+#define        _PER_SUPPORT_H_
+
+#include <asn_system.h>                /* Platform-specific types */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Pre-computed PER constraints.
+ */
+typedef struct asn_per_constraint_s {
+       enum asn_per_constraint_flags {
+               APC_UNCONSTRAINED       = 0x0,  /* No PER visible constraints */
+               APC_SEMI_CONSTRAINED    = 0x1,  /* Constrained at "lb" */
+               APC_CONSTRAINED         = 0x2,  /* Fully constrained */
+               APC_EXTENSIBLE          = 0x4   /* May have extension */
+       } flags;
+       int  range_bits;                /* Full number of bits in the range */
+       int  effective_bits;            /* Effective bits */
+       long lower_bound;               /* "lb" value */
+       long upper_bound;               /* "ub" value */
+} asn_per_constraint_t;
+typedef struct asn_per_constraints_s {
+       asn_per_constraint_t value;
+       asn_per_constraint_t size;
+} asn_per_constraints_t;
+
+/*
+ * This structure describes a position inside an incoming PER bit stream.
+ */
+typedef struct asn_per_data_s {
+ const uint8_t *buffer;        /* Pointer to the octet stream */
+        size_t  nboff; /* Bit offset to the meaningful bit */
+        size_t  nbits; /* Number of bits in the stream */
+} asn_per_data_t;
+
+/*
+ * Extract a small number of bits (<= 31) from the specified PER data pointer.
+ * This function returns -1 if the specified number of bits could not be
+ * extracted due to EOD or other conditions.
+ */
+int32_t per_get_few_bits(asn_per_data_t *per_data, int get_nbits);
+
+/*
+ * Extract a large number of bits from the specified PER data pointer.
+ * This function returns -1 if the specified number of bits could not be
+ * extracted due to EOD or other conditions.
+ */
+int per_get_many_bits(asn_per_data_t *pd, uint8_t *dst, int right_align,
+                       int get_nbits);
+
+/*
+ * Get the length "n" from the Unaligned PER stream.
+ */
+ssize_t uper_get_length(asn_per_data_t *pd,
+                       int effective_bound_bits,
+                       int *repeat);
+
+/*
+ * Get the normally small non-negative whole number.
+ */
+ssize_t uper_get_nsnnwn(asn_per_data_t *pd);
+
+/*
+ * This structure supports forming PER output.
+ */
+typedef struct asn_per_outp_s {
+       uint8_t *buffer;        /* Pointer into the (tmpspace) */
+       size_t nboff;           /* Bit offset to the meaningful bit */
+       size_t nbits;           /* Number of bits left in (tmpspace) */
+       uint8_t tmpspace[32];   /* Preliminary storage to hold data */
+       int (*outper)(const void *data, size_t size, void *op_key);
+       void *op_key;           /* Key for (outper) data callback */
+       size_t flushed_bytes;   /* Bytes already flushed through (outper) */
+} asn_per_outp_t;
+
+/* Output a small number of bits (<= 31) */
+int per_put_few_bits(asn_per_outp_t *per_data, uint32_t bits, int obits);
+
+/* Output a large number of bits */
+int per_put_many_bits(asn_per_outp_t *po, const uint8_t *src, int put_nbits);
+
+/*
+ * Put the length "n" to the Unaligned PER stream.
+ * This function returns the number of units which may be flushed
+ * in the next units saving iteration.
+ */
+ssize_t uper_put_length(asn_per_outp_t *po, size_t whole_length);
+
+/*
+ * Put the normally small non-negative whole number.
+ */
+int uper_put_nsnnwn(asn_per_outp_t *po, int n);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _PER_SUPPORT_H_ */