nghttp2/lib/nghttp2_hd.h

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/*
* nghttp2 - HTTP/2.0 C Library
*
* Copyright (c) 2013 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef NGHTTP2_HD_COMP_H
#define NGHTTP2_HD_COMP_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <nghttp2/nghttp2.h>
#define NGHTTP2_INITIAL_HD_TABLE_SIZE 128
#define NGHTTP2_INITIAL_REFSET_SIZE 128
#define NGHTTP2_INITIAL_WS_SIZE 128
#define NGHTTP2_MAX_HD_TABLE_CAPACITY 4096
#define NGHTTP2_HD_ENTRY_OVERHEAD 32
typedef enum {
NGHTTP2_HD_SIDE_CLIENT = 0,
NGHTTP2_HD_SIDE_SERVER = 1
} nghttp2_hd_side;
typedef enum {
NGHTTP2_HD_FLAG_NONE = 0,
/* Indicates name was dynamically allocated and must be freed */
NGHTTP2_HD_FLAG_NAME_ALLOC = 1,
/* Indicates value was dynamically allocated and must be freed */
NGHTTP2_HD_FLAG_VALUE_ALLOC = 1 << 1,
} nghttp2_hd_flags;
typedef struct {
nghttp2_nv nv;
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/* Reference count */
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uint8_t ref;
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/* Index in the header table */
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uint8_t index;
uint8_t flags;
} nghttp2_hd_entry;
typedef enum {
NGHTTP2_HD_CAT_NONE,
NGHTTP2_HD_CAT_INDEXED,
NGHTTP2_HD_CAT_LITERAL_IDXNAME,
NGHTTP2_HD_CAT_LITERAL
} nghttp2_hd_entry_cat;
typedef struct nghttp2_hd_ws_entry {
nghttp2_hd_entry_cat cat;
union {
/* For NGHTTP2_HD_CAT_INDEXED */
nghttp2_hd_entry *entry;
/* For NGHTTP2_HD_CAT_LITERAL */
nghttp2_nv nv;
/* For NGHTTP2_HD_CAT_LITERAL_IDXNAME */
struct {
/* The entry in header table the name stored */
nghttp2_hd_entry *entry;
uint8_t *value;
uint16_t valuelen;
} entv;
};
/* TODO Only usable with NGHTTP2_HD_CAT_INDEXED */
uint8_t index;
uint8_t checked;
} nghttp2_hd_ws_entry;
typedef struct {
/* Header table */
nghttp2_hd_entry **hd_table;
/* Reference set */
nghttp2_hd_entry **refset;
/* Working set */
nghttp2_hd_ws_entry *ws;
/* The capacity of the |hd_table| */
uint16_t hd_table_capacity;
/* the number of entry the |hd_table| contains */
uint16_t hd_tablelen;
/* The capacity of the |refset| */
uint16_t refset_capacity;
/* The number of entry the |refset| contains */
uint16_t refsetlen;
/* The capacity of the |ws| */
uint16_t ws_capacity;
/* The number of entry the |ws| contains */
uint16_t wslen;
/* Abstract capacity of hd_table as described in the spec. This is
the sum of length of name/value in hd_table +
NGHTTP2_HD_ENTRY_OVERHEAD bytes overhead per each entry. */
uint16_t capacity;
} nghttp2_hd_context;
/*
* Initializes the |ent| members. If NGHTTP2_HD_FLAG_NAME_ALLOC bit
* set in the |flags|, the content pointed by the |name| with length
* |namelen| is copied. Likewise, if NGHTTP2_HD_FLAG_VALUE_ALLOC bit
* set in the |flags|, the content pointed by the |value| with length
* |valuelen| is copied.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
int nghttp2_hd_entry_init(nghttp2_hd_entry *ent, uint8_t index, uint8_t flags,
uint8_t *name, uint16_t namelen,
uint8_t *value, uint16_t valuelen);
void nghttp2_hd_entry_free(nghttp2_hd_entry *ent);
/*
* Initializes |deflater| for deflating name/values pairs.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
int nghttp2_hd_deflate_init(nghttp2_hd_context *deflater,
nghttp2_hd_side side);
/*
* Initializes |inflater| for inflating name/values pairs.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
int nghttp2_hd_inflate_init(nghttp2_hd_context *inflater,
nghttp2_hd_side side);
/*
* Deallocates any resources allocated for |deflater|.
*/
void nghttp2_hd_deflate_free(nghttp2_hd_context *deflater);
/*
* Deallocates any resources allocated for |inflater|.
*/
void nghttp2_hd_inflate_free(nghttp2_hd_context *inflater);
/*
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* Deflates the |nva|, which has the |nvlen| name/value pairs, into
* the buffer pointed by the |*buf_ptr| with the length |*buflen_ptr|.
* The output starts after |nv_offset| bytes from |*buf_ptr|.
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*
* This function expands |*buf_ptr| as necessary to store the
* result. When expansion occurred, memory previously pointed by
* |*buf_ptr| is freed. |*buf_ptr| and |*buflen_ptr| are updated
* accordingly.
*
* This function returns the number of bytes outputted if it succeeds,
* or one of the following negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory.
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* NGHTTP2_ERR_HEADER_COMP
* Deflation process has failed.
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*/
ssize_t nghttp2_hd_deflate_hd(nghttp2_hd_context *deflater,
uint8_t **buf_ptr, size_t *buflen_ptr,
size_t nv_offset,
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nghttp2_nv *nva, size_t nvlen);
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/*
* Inflates name/value block stored in |in| with length |inlen|. This
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* function performs decompression. The |*nva_ptr| points to the final
* result on succesful decompression. The caller must free |*nva_ptr|
* using nghttp2_nv_array_del().
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*
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* This function returns the number of name/value pairs in |*nva_ptr|
* if it succeeds, or one of the following negative error codes:
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*
* NGHTTP2_ERR_NOMEM
* Out of memory.
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* NGHTTP2_ERR_HEADER_COMP
* Inflation process has failed.
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*/
ssize_t nghttp2_hd_inflate_hd(nghttp2_hd_context *inflater,
nghttp2_nv **nva_ptr,
uint8_t *in, size_t inlen);
/*
* Signals the end of processing one header block. This function
* creates new reference set from working set.
*
* This function returns 0 if it succeeds. Currently this function
* always succeeds.
*/
int nghttp2_hd_end_headers(nghttp2_hd_context *deflater_or_inflater);
/* For unittesting purpose */
int nghttp2_hd_emit_indname_block(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t *offset_ptr, nghttp2_hd_entry *ent,
const uint8_t *value, size_t valuelen,
int inc_indexing);
/* For unittesting purpose */
int nghttp2_hd_emit_literal_block(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t *offset_ptr, nghttp2_nv *nv,
int inc_indexing);
/* For unittesting purpose */
int nghttp2_hd_emit_subst_indname_block(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t *offset_ptr,
nghttp2_hd_entry *ent,
const uint8_t *value, size_t valuelen,
size_t index);
/* For unittesting purpose */
int nghttp2_hd_emit_subst_literal_block(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t *offset_ptr, nghttp2_nv *nv,
size_t index);
#endif /* NGHTTP2_HD_COMP_H */