356 lines
12 KiB
C
356 lines
12 KiB
C
/*
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* nghttp2 - HTTP/2 C Library
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*
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* Copyright (c) 2013 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef NGHTTP2_HD_H
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#define NGHTTP2_HD_H
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif /* HAVE_CONFIG_H */
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#include <nghttp2/nghttp2.h>
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#include "nghttp2_hd_huffman.h"
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#include "nghttp2_buf.h"
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#define NGHTTP2_HD_DEFAULT_MAX_BUFFER_SIZE NGHTTP2_DEFAULT_HEADER_TABLE_SIZE
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#define NGHTTP2_HD_ENTRY_OVERHEAD 32
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/* The maximum length of one name/value pair. This is the sum of the
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length of name and value. This is not specified by the spec. We
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just chose the arbitrary size */
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#define NGHTTP2_HD_MAX_NV 65536
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/* Default size of maximum table buffer size for encoder. Even if
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remote decoder notifies larger buffer size for its decoding,
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encoder only uses the memory up to this value. */
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#define NGHTTP2_HD_DEFAULT_MAX_DEFLATE_BUFFER_SIZE (1 << 12)
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typedef enum {
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NGHTTP2_HD_ROLE_DEFLATE,
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NGHTTP2_HD_ROLE_INFLATE
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} nghttp2_hd_role;
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typedef enum {
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NGHTTP2_HD_FLAG_NONE = 0,
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/* Indicates name was dynamically allocated and must be freed */
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NGHTTP2_HD_FLAG_NAME_ALLOC = 1,
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/* Indicates value was dynamically allocated and must be freed */
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NGHTTP2_HD_FLAG_VALUE_ALLOC = 1 << 1,
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/* Indicates that the entry is in the reference set */
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NGHTTP2_HD_FLAG_REFSET = 1 << 2,
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/* Indicates that the entry is emitted in the current header
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processing. */
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NGHTTP2_HD_FLAG_EMIT = 1 << 3,
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NGHTTP2_HD_FLAG_IMPLICIT_EMIT = 1 << 4,
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/* Indicates that the name was gifted to the entry and no copying
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necessary. */
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NGHTTP2_HD_FLAG_NAME_GIFT = 1 << 5,
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/* Indicates that the value was gifted to the entry and no copying
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necessary. */
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NGHTTP2_HD_FLAG_VALUE_GIFT = 1 << 6
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} nghttp2_hd_flags;
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typedef struct {
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nghttp2_nv nv;
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uint32_t name_hash;
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uint32_t value_hash;
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/* Reference count */
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uint8_t ref;
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uint8_t flags;
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} nghttp2_hd_entry;
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typedef struct {
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nghttp2_hd_entry **buffer;
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size_t mask;
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size_t first;
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size_t len;
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} nghttp2_hd_ringbuf;
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typedef enum {
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NGHTTP2_HD_OPCODE_NONE,
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NGHTTP2_HD_OPCODE_INDEXED,
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NGHTTP2_HD_OPCODE_NEWNAME,
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NGHTTP2_HD_OPCODE_INDNAME
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} nghttp2_hd_opcode;
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typedef enum {
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NGHTTP2_HD_STATE_OPCODE,
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NGHTTP2_HD_STATE_CLEAR_REFSET,
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NGHTTP2_HD_STATE_READ_TABLE_SIZE,
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NGHTTP2_HD_STATE_READ_INDEX,
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NGHTTP2_HD_STATE_NEWNAME_CHECK_NAMELEN,
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NGHTTP2_HD_STATE_NEWNAME_READ_NAMELEN,
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NGHTTP2_HD_STATE_NEWNAME_READ_NAMEHUFF,
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NGHTTP2_HD_STATE_NEWNAME_READ_NAME,
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NGHTTP2_HD_STATE_CHECK_VALUELEN,
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NGHTTP2_HD_STATE_READ_VALUELEN,
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NGHTTP2_HD_STATE_READ_VALUEHUFF,
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NGHTTP2_HD_STATE_READ_VALUE
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} nghttp2_hd_inflate_state;
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typedef struct {
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/* dynamic header table */
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nghttp2_hd_ringbuf hd_table;
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/* Abstract buffer size of hd_table as described in the spec. This
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is the sum of length of name/value in hd_table +
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NGHTTP2_HD_ENTRY_OVERHEAD bytes overhead per each entry. */
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size_t hd_table_bufsize;
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/* The effective header table size. */
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size_t hd_table_bufsize_max;
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/* Role of this context; deflate or infalte */
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nghttp2_hd_role role;
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/* If inflate/deflate error occurred, this value is set to 1 and
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further invocation of inflate/deflate will fail with
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NGHTTP2_ERR_HEADER_COMP. */
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uint8_t bad;
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} nghttp2_hd_context;
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struct nghttp2_hd_deflater {
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nghttp2_hd_context ctx;
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/* The upper limit of the header table size the deflater accepts. */
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size_t deflate_hd_table_bufsize_max;
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/* Set to this nonzero to clear reference set on each deflation each
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time. */
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uint8_t no_refset;
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/* If nonzero, send header table size using encoding context update
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in the next deflate process */
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uint8_t notify_table_size_change;
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};
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struct nghttp2_hd_inflater {
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nghttp2_hd_context ctx;
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/* header buffer */
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nghttp2_bufs nvbufs;
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/* Stores current state of huffman decoding */
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nghttp2_hd_huff_decode_context huff_decode_ctx;
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/* Pointer to the nghttp2_hd_entry which is used current header
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emission. This is required because in some cases the
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ent_keep->ref == 0 and we have to keep track of it. */
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nghttp2_hd_entry *ent_keep;
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/* Pointer to the name/value pair buffer which is used in the
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current header emission. */
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uint8_t *nv_keep;
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/* Pointers to the name/value pair which is referred as indexed
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name. This entry must be in header table. */
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nghttp2_hd_entry *ent_name;
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/* The number of bytes to read */
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size_t left;
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/* The index in indexed repr or indexed name */
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size_t index;
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/* The index of header table to toggle off the entry from reference
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set at the end of decompression. */
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size_t end_headers_index;
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/* The length of new name encoded in literal. For huffman encoded
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string, this is the length after it is decoded. */
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size_t newnamelen;
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/* The maximum header table size the inflater supports. This is the
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same value transmitted in SETTINGS_HEADER_TABLE_SIZE */
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size_t settings_hd_table_bufsize_max;
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/* The number of next shift to decode integer */
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size_t shift;
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nghttp2_hd_opcode opcode;
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nghttp2_hd_inflate_state state;
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/* nonzero if string is huffman encoded */
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uint8_t huffman_encoded;
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/* nonzero if deflater requires that current entry is indexed */
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uint8_t index_required;
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/* nonzero if deflater requires that current entry must not be
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indexed */
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uint8_t no_index;
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};
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/*
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* Initializes the |ent| members. If NGHTTP2_HD_FLAG_NAME_ALLOC bit
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* set in the |flags|, the content pointed by the |name| with length
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* |namelen| is copied. Likewise, if NGHTTP2_HD_FLAG_VALUE_ALLOC bit
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* set in the |flags|, the content pointed by the |value| with length
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* |valuelen| is copied.
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory.
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*/
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int nghttp2_hd_entry_init(nghttp2_hd_entry *ent, uint8_t flags,
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uint8_t *name, size_t namelen,
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uint8_t *value, size_t valuelen);
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void nghttp2_hd_entry_free(nghttp2_hd_entry *ent);
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/*
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* Initializes |deflater| for deflating name/values pairs.
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*
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* The encoder only uses up to
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* NGHTTP2_HD_DEFAULT_MAX_DEFLATE_BUFFER_SIZE bytes for header table
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* even if the larger value is specified later in
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* nghttp2_hd_change_table_size().
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory.
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*/
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int nghttp2_hd_deflate_init(nghttp2_hd_deflater *deflater);
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/*
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* Initializes |deflater| for deflating name/values pairs.
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*
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* The encoder only uses up to |deflate_hd_table_bufsize_max| bytes
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* for header table even if the larger value is specified later in
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* nghttp2_hd_change_table_size().
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory.
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*/
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int nghttp2_hd_deflate_init2(nghttp2_hd_deflater *deflater,
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size_t deflate_hd_table_bufsize_max);
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/*
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* Deallocates any resources allocated for |deflater|.
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*/
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void nghttp2_hd_deflate_free(nghttp2_hd_deflater *deflater);
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/*
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* Deflates the |nva|, which has the |nvlen| name/value pairs, into
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* the |bufs|.
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*
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* This function expands |bufs| as necessary to store the result. If
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* buffers is full and the process still requires more space, this
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* funtion fails and returns NGHTTP2_ERR_HEADER_COMP.
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*
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* After this function returns, it is safe to delete the |nva|.
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory.
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* NGHTTP2_ERR_HEADER_COMP
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* Deflation process has failed.
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* NGHTTP2_ERR_BUFFER_ERROR
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* Out of buffer space.
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*/
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int nghttp2_hd_deflate_hd_bufs(nghttp2_hd_deflater *deflater,
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nghttp2_bufs *bufs,
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const nghttp2_nv *nva, size_t nvlen);
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/*
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* Initializes |inflater| for inflating name/values pairs.
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* :enum:`NGHTTP2_ERR_NOMEM`
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* Out of memory.
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*/
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int nghttp2_hd_inflate_init(nghttp2_hd_inflater *inflater);
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/*
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* Deallocates any resources allocated for |inflater|.
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*/
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void nghttp2_hd_inflate_free(nghttp2_hd_inflater *inflater);
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/* For unittesting purpose */
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int nghttp2_hd_emit_indname_block(nghttp2_bufs *bufs, size_t index,
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nghttp2_nv *nv, int inc_indexing);
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/* For unittesting purpose */
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int nghttp2_hd_emit_newname_block(nghttp2_bufs *bufs, nghttp2_nv *nv,
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int inc_indexing);
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/* For unittesting purpose */
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int nghttp2_hd_emit_table_size(nghttp2_bufs *bufs, size_t table_size);
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/* For unittesting purpose */
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nghttp2_hd_entry* nghttp2_hd_table_get(nghttp2_hd_context *context,
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size_t index);
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/* For unittesting purpose */
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ssize_t nghttp2_hd_decode_length(uint32_t *res, size_t *shift_ptr, int *final,
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uint32_t initial, size_t shift,
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uint8_t *in, uint8_t *last, size_t prefix);
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/* Huffman encoding/decoding functions */
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/*
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* Counts the required bytes to encode |src| with length |len|.
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*
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* This function returns the number of required bytes to encode given
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* data, including padding of prefix of terminal symbol code. This
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* function always succeeds.
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*/
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size_t nghttp2_hd_huff_encode_count(const uint8_t *src, size_t len);
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/*
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* Encodes the given data |src| with length |srclen| to the |bufs|.
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* This function expands extra buffers in |bufs| if necessary.
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory.
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* NGHTTP2_ERR_BUFFER_ERROR
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* Out of buffer space.
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*/
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int nghttp2_hd_huff_encode(nghttp2_bufs *bufs,
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const uint8_t *src, size_t srclen);
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void nghttp2_hd_huff_decode_context_init(nghttp2_hd_huff_decode_context *ctx);
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/*
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* Decodes the given data |src| with length |srclen|. The |ctx| must
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* be initialized by nghttp2_hd_huff_decode_context_init(). The result
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* will be added to |dest|. This function may expand |dest| as
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* needed. The caller is responsible to release the memory of |dest|
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* by calling nghttp2_bufs_free() or export its content using
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* nghttp2_bufs_remove().
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*
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* The caller must set the |final| to nonzero if the given input is
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* the final block.
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*
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* This function returns the number of read bytes from the |in|.
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*
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* If this function fails, it returns one of the following negative
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* return codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory.
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* NGHTTP2_ERR_BUFFER_ERROR
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* Maximum buffer capacity size exceeded.
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* NGHTTP2_ERR_HEADER_COMP
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* Decoding process has failed.
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*/
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ssize_t nghttp2_hd_huff_decode(nghttp2_hd_huff_decode_context *ctx,
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nghttp2_bufs *bufs,
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const uint8_t *src, size_t srclen, int final);
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#endif /* NGHTTP2_HD_H */
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