/* * 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 #endif /* HAVE_CONFIG_H */ #include #define NGHTTP2_INITIAL_HD_TABLE_SIZE 128 #define NGHTTP2_INITIAL_REFSET_SIZE 128 #define NGHTTP2_INITIAL_WS_SIZE 128 #define NGHTTP2_HD_MAX_BUFFER_SIZE 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; /* Reference count */ uint8_t ref; /* Index in the header table */ uint8_t index; uint8_t flags; } nghttp2_hd_entry; typedef enum { NGHTTP2_HD_CAT_NONE, NGHTTP2_HD_CAT_INDEXED, NGHTTP2_HD_CAT_INDNAME, NGHTTP2_HD_CAT_NEWNAME } nghttp2_hd_entry_cat; typedef struct nghttp2_hd_ws_entry { nghttp2_hd_entry_cat cat; union { /* For NGHTTP2_HD_CAT_INDEXED */ struct { nghttp2_hd_entry *entry; uint8_t index; uint8_t checked; } indexed; /* For NGHTTP2_HD_CAT_NEWNAME */ struct { nghttp2_nv nv; } newname; /* For NGHTTP2_HD_CAT_LITERAL_INDNAME */ struct { /* The entry in header table the name stored */ nghttp2_hd_entry *entry; uint8_t *value; uint16_t valuelen; } indname; }; } 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 buffer size 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 hd_table_bufsize; /* If inflate/deflate error occurred, this value is set to 1 and further invocation of inflate/deflate will fail with NGHTTP2_ERR_HEADER_COMP. */ uint8_t bad; } 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); /* * 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|. * * 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. * NGHTTP2_ERR_HEADER_COMP * Deflation process has failed. */ ssize_t nghttp2_hd_deflate_hd(nghttp2_hd_context *deflater, uint8_t **buf_ptr, size_t *buflen_ptr, size_t nv_offset, nghttp2_nv *nva, size_t nvlen); /* * Inflates name/value block stored in |in| with length |inlen|. This * 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(). * * This function returns the number of name/value pairs in |*nva_ptr| * if it succeeds, or one of the following negative error codes: * * NGHTTP2_ERR_NOMEM * Out of memory. * NGHTTP2_ERR_HEADER_COMP * Inflation process has failed. */ 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_newname_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_newname_block(uint8_t **buf_ptr, size_t *buflen_ptr, size_t *offset_ptr, nghttp2_nv *nv, size_t index); #endif /* NGHTTP2_HD_COMP_H */