1 #ifndef LSXPACK_HEADER_H_v207
2 #define LSXPACK_HEADER_H_v207
3
4 #ifdef __cplusplus
5 extern "C" {
6 #endif
7
8 #include <assert.h>
9 #include <stdint.h>
10 #include <string.h>
11
12 #ifndef LSXPACK_MAX_STRLEN
13 #define LSXPACK_MAX_STRLEN UINT16_MAX
14 #endif
15
16 #if LSXPACK_MAX_STRLEN == UINT16_MAX
17 typedef uint16_t lsxpack_strlen_t;
18 #elif LSXPACK_MAX_STRLEN == UINT32_MAX
19 typedef uint32_t lsxpack_strlen_t;
20 #else
21 #error unexpected LSXPACK_MAX_STRLEN
22 #endif
23
24 #define LSXPACK_DEL ((char *)NULL)
25
26 enum lsxpack_flag
27 {
28 LSXPACK_HPACK_VAL_MATCHED = 1,
29 LSXPACK_QPACK_IDX = 2,
30 LSXPACK_APP_IDX = 4,
31 LSXPACK_NAME_HASH = 8,
32 LSXPACK_NAMEVAL_HASH = 16,
33 LSXPACK_VAL_MATCHED = 32,
34 LSXPACK_NEVER_INDEX = 64,
35 };
36
37 /**
38 * When header are decoded, it should be stored to @buf starting from @name_offset,
39 * <name>: <value>\r\n
40 * So, it can be used directly as HTTP/1.1 header. there are 4 extra characters
41 * added.
42 *
43 * limitation: we currently does not support total header size > 64KB.
44 */
45
46 struct lsxpack_header
47 {
48 char *buf; /* the buffer for headers */
49 uint32_t name_hash; /* hash value for name */
50 uint32_t nameval_hash; /* hash value for name + value */
51 lsxpack_strlen_t name_offset; /* the offset for name in the buffer */
52 lsxpack_strlen_t name_len; /* the length of name */
53 lsxpack_strlen_t val_offset; /* the offset for value in the buffer */
54 lsxpack_strlen_t val_len; /* the length of value */
55 uint16_t chain_next_idx; /* mainly for cookie value chain */
56 uint8_t hpack_index; /* HPACK static table index */
57 uint8_t qpack_index; /* QPACK static table index */
58 uint8_t app_index; /* APP header index */
59 enum lsxpack_flag flags:8; /* combination of lsxpack_flag */
60 uint8_t indexed_type; /* control to disable index or not */
61 uint8_t dec_overhead; /* num of extra bytes written to decoded buffer */
62 };
63
64 typedef struct lsxpack_header lsxpack_header_t;
65
66
67 static inline void
lsxpack_header_set_idx(lsxpack_header_t * hdr,int hpack_idx,const char * val,size_t val_len)68 lsxpack_header_set_idx(lsxpack_header_t *hdr, int hpack_idx,
69 const char *val, size_t val_len)
70 {
71 memset(hdr, 0, sizeof(*hdr));
72 hdr->buf = (char *)val;
73 hdr->hpack_index = (uint8_t)hpack_idx;
74 assert(hpack_idx != 0);
75 assert(val_len <= LSXPACK_MAX_STRLEN);
76 hdr->val_len = (lsxpack_strlen_t)val_len;
77 }
78
79
80 static inline void
lsxpack_header_set_qpack_idx(lsxpack_header_t * hdr,int qpack_idx,const char * val,size_t val_len)81 lsxpack_header_set_qpack_idx(lsxpack_header_t *hdr, int qpack_idx,
82 const char *val, size_t val_len)
83 {
84 memset(hdr, 0, sizeof(*hdr));
85 hdr->buf = (char *)val;
86 hdr->qpack_index = (uint8_t)qpack_idx;
87 assert(qpack_idx != -1);
88 hdr->flags = LSXPACK_QPACK_IDX;
89 assert(val_len <= LSXPACK_MAX_STRLEN);
90 hdr->val_len = (lsxpack_strlen_t)val_len;
91 }
92
93
94 static inline void
lsxpack_header_set_offset(lsxpack_header_t * hdr,const char * buf,size_t name_offset,size_t name_len,size_t val_len)95 lsxpack_header_set_offset(lsxpack_header_t *hdr, const char *buf,
96 size_t name_offset, size_t name_len,
97 size_t val_len)
98 {
99 memset(hdr, 0, sizeof(*hdr));
100 hdr->buf = (char *)buf;
101 hdr->name_offset = (lsxpack_strlen_t)name_offset;
102 assert(name_len <= LSXPACK_MAX_STRLEN);
103 hdr->name_len = (lsxpack_strlen_t)name_len;
104 assert(name_offset + name_len + 2 <= LSXPACK_MAX_STRLEN);
105 hdr->val_offset = (lsxpack_strlen_t)(name_offset + name_len + 2);
106 assert(val_len <= LSXPACK_MAX_STRLEN);
107 hdr->val_len = (lsxpack_strlen_t)val_len;
108 }
109
110
111 static inline void
lsxpack_header_set_offset2(lsxpack_header_t * hdr,const char * buf,size_t name_offset,size_t name_len,size_t val_offset,size_t val_len)112 lsxpack_header_set_offset2(lsxpack_header_t *hdr, const char *buf,
113 size_t name_offset, size_t name_len,
114 size_t val_offset, size_t val_len)
115 {
116 memset(hdr, 0, sizeof(*hdr));
117 hdr->buf = (char *)buf;
118 hdr->name_offset = (lsxpack_strlen_t)name_offset;
119 assert(name_len <= LSXPACK_MAX_STRLEN);
120 hdr->name_len = (lsxpack_strlen_t)name_len;
121 assert(val_offset <= LSXPACK_MAX_STRLEN);
122 hdr->val_offset = (lsxpack_strlen_t)val_offset;
123 assert(val_len <= LSXPACK_MAX_STRLEN);
124 hdr->val_len = (lsxpack_strlen_t)val_len;
125 }
126
127
128 static inline void
lsxpack_header_prepare_decode(lsxpack_header_t * hdr,char * out,size_t offset,size_t len)129 lsxpack_header_prepare_decode(lsxpack_header_t *hdr,
130 char *out, size_t offset, size_t len)
131 {
132 memset(hdr, 0, sizeof(*hdr));
133 hdr->buf = out;
134 assert(offset <= LSXPACK_MAX_STRLEN);
135 hdr->name_offset = (lsxpack_strlen_t)offset;
136 if (len > LSXPACK_MAX_STRLEN)
137 hdr->val_len = LSXPACK_MAX_STRLEN;
138 else
139 hdr->val_len = (lsxpack_strlen_t)len;
140 }
141
142
143 static inline const char *
lsxpack_header_get_name(const lsxpack_header_t * hdr)144 lsxpack_header_get_name(const lsxpack_header_t *hdr)
145 {
146 return (hdr->name_len)? hdr->buf + hdr->name_offset : NULL;
147 }
148
149
150 static inline const char *
lsxpack_header_get_value(const lsxpack_header_t * hdr)151 lsxpack_header_get_value(const lsxpack_header_t *hdr)
152 { return hdr->buf + hdr->val_offset; }
153
154 static inline size_t
lsxpack_header_get_dec_size(const lsxpack_header_t * hdr)155 lsxpack_header_get_dec_size(const lsxpack_header_t *hdr)
156 { return hdr->name_len + hdr->val_len + hdr->dec_overhead; }
157
158 static inline void
lsxpack_header_mark_val_changed(lsxpack_header_t * hdr)159 lsxpack_header_mark_val_changed(lsxpack_header_t *hdr)
160 {
161 hdr->flags = (enum lsxpack_flag)(hdr->flags &
162 ~(LSXPACK_HPACK_VAL_MATCHED|LSXPACK_VAL_MATCHED|LSXPACK_NAMEVAL_HASH));
163 }
164 #ifdef __cplusplus
165 }
166 #endif
167
168 #endif //LSXPACK_HEADER_H_v207
169