2 * Copyright (c) 2004-2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
3 * Redistribution and modifications are permitted subject to BSD license.
5 #ifndef _XER_DECODER_H_
6 #define _XER_DECODER_H_
8 #include <asn_application.h>
14 struct asn_TYPE_descriptor_s; /* Forward declaration */
17 * The XER decoder of any ASN.1 type. May be invoked by the application.
18 * Decodes CANONICAL-XER and BASIC-XER.
20 asn_dec_rval_t xer_decode(
21 const struct asn_codec_ctx_s *opt_codec_ctx,
22 const struct asn_TYPE_descriptor_s *type_descriptor,
23 void **struct_ptr, /* Pointer to a target structure's pointer */
24 const void *buffer, /* Data to be decoded */
25 size_t size /* Size of data buffer */
29 * Type of the type-specific XER decoder function.
31 typedef asn_dec_rval_t(xer_type_decoder_f)(
32 const asn_codec_ctx_t *opt_codec_ctx,
33 const struct asn_TYPE_descriptor_s *type_descriptor, void **struct_ptr,
34 const char *opt_mname, /* Member name */
35 const void *buf_ptr, size_t size);
37 /*******************************
38 * INTERNALLY USEFUL FUNCTIONS *
39 *******************************/
42 * Generalized function for decoding the primitive values.
43 * Used by more specialized functions, such as OCTET_STRING_decode_xer_utf8
44 * and others. This function should not be used by applications, as its API
45 * is subject to changes.
47 asn_dec_rval_t xer_decode_general(
48 const asn_codec_ctx_t *opt_codec_ctx,
49 asn_struct_ctx_t *ctx, /* Type decoder context */
50 void *struct_key, /* Treated as opaque pointer */
51 const char *xml_tag, /* Expected XML tag name */
52 const void *buf_ptr, size_t size,
53 int (*opt_unexpected_tag_decoder)(void *struct_key, const void *chunk_buf,
55 ssize_t (*body_receiver)(void *struct_key, const void *chunk_buf,
56 size_t chunk_size, int have_more));
60 * Fetch the next XER (XML) token from the stream.
61 * The function returns the number of bytes occupied by the chunk type,
62 * returned in the _ch_type. The _ch_type is only set (and valid) when
63 * the return value is >= 0.
65 typedef enum pxer_chunk_type {
66 PXER_WMORE, /* Chunk type is not clear, more data expected. */
67 PXER_TAG, /* Complete XER tag */
68 PXER_TEXT, /* Plain text between XER tags */
69 PXER_COMMENT /* A comment, may be part of */
71 ssize_t xer_next_token(int *stateContext,
72 const void *buffer, size_t size, pxer_chunk_type_e *_ch_type);
75 * This function checks the buffer against the tag name is expected to occur.
77 typedef enum xer_check_tag {
78 XCT_BROKEN = 0, /* The tag is broken */
79 XCT_OPENING = 1, /* This is the <opening> tag */
80 XCT_CLOSING = 2, /* This is the </closing> tag */
81 XCT_BOTH = 3, /* This is the <modified/> tag */
82 XCT__UNK__MASK = 4, /* Mask of everything unexpected */
83 XCT_UNKNOWN_OP = 5, /* Unexpected <opening> tag */
84 XCT_UNKNOWN_CL = 6, /* Unexpected </closing> tag */
85 XCT_UNKNOWN_BO = 7 /* Unexpected <modified/> tag */
87 xer_check_tag_e xer_check_tag(const void *buf_ptr, int size,
88 const char *need_tag);
91 * Get the number of bytes consisting entirely of XER whitespace characters.
93 * >=0: Number of whitespace characters in the string.
95 size_t xer_whitespace_span(const void *chunk_buf, size_t chunk_size);
98 * Skip the series of anticipated extensions.
100 int xer_skip_unknown(xer_check_tag_e tcv, ber_tlv_len_t *depth);
106 #endif /* _XER_DECODER_H_ */