diff options
Diffstat (limited to 'wsutil/nghttp2/nghttp2_hd_huffman.c')
| -rw-r--r-- | wsutil/nghttp2/nghttp2_hd_huffman.c | 207 |
1 files changed, 0 insertions, 207 deletions
diff --git a/wsutil/nghttp2/nghttp2_hd_huffman.c b/wsutil/nghttp2/nghttp2_hd_huffman.c deleted file mode 100644 index c885722673..0000000000 --- a/wsutil/nghttp2/nghttp2_hd_huffman.c +++ /dev/null @@ -1,207 +0,0 @@ -/* - * nghttp2 - HTTP/2 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. - */ -#include "nghttp2_hd_huffman.h" - -#include <string.h> -#include <assert.h> -#include <stdio.h> - -#include "nghttp2_hd.h" - -extern const nghttp2_huff_sym huff_sym_table[]; -extern const nghttp2_huff_decode huff_decode_table[][16]; - -/* - * Encodes huffman code |sym| into |*dest_ptr|, whose least |rembits| - * bits are not filled yet. The |rembits| must be in range [1, 8], - * inclusive. At the end of the process, the |*dest_ptr| is updated - * and points where next output should be placed. The number of - * unfilled bits in the pointed location is returned. - */ -static ssize_t huff_encode_sym(nghttp2_bufs *bufs, size_t *avail_ptr, - size_t rembits, - const nghttp2_huff_sym *sym) -{ - int rv; - size_t nbits = sym->nbits; - - for(;;) { - if(rembits > nbits) { - if(*avail_ptr) { - nghttp2_bufs_fast_orb_hold(bufs, sym->code << (rembits - nbits)); - } else { - rv = nghttp2_bufs_orb_hold(bufs, sym->code << (rembits - nbits)); - if(rv != 0) { - return rv; - } - - *avail_ptr = nghttp2_bufs_cur_avail(bufs); - } - - rembits -= nbits; - - break; - } - - if(*avail_ptr) { - nghttp2_bufs_fast_orb(bufs, sym->code >> (nbits - rembits)); - --*avail_ptr; - } else { - rv = nghttp2_bufs_orb(bufs, sym->code >> (nbits - rembits)); - if(rv != 0) { - return rv; - } - - *avail_ptr = nghttp2_bufs_cur_avail(bufs); - } - - nbits -= rembits; - rembits = 8; - - if(nbits == 0) { - break; - } - - if(*avail_ptr) { - nghttp2_bufs_fast_addb_hold(bufs, 0); - } else { - rv = nghttp2_bufs_addb_hold(bufs, 0); - if(rv != 0) { - return rv; - } - - *avail_ptr = nghttp2_bufs_cur_avail(bufs); - } - } - return (ssize_t)rembits; -} - -size_t nghttp2_hd_huff_encode_count(const uint8_t *src, size_t len) -{ - size_t i; - size_t nbits = 0; - - for(i = 0; i < len; ++i) { - nbits += huff_sym_table[src[i]].nbits; - } - /* pad the prefix of EOS (256) */ - return (nbits + 7) / 8; -} - -int nghttp2_hd_huff_encode(nghttp2_bufs *bufs, - const uint8_t *src, size_t srclen) -{ - int rv; - ssize_t rembits = 8; - size_t i; - size_t avail; - - avail = nghttp2_bufs_cur_avail(bufs); - - for(i = 0; i < srclen; ++i) { - const nghttp2_huff_sym *sym = &huff_sym_table[src[i]]; - if(rembits == 8) { - if(avail) { - nghttp2_bufs_fast_addb_hold(bufs, 0); - } else { - rv = nghttp2_bufs_addb_hold(bufs, 0); - if(rv != 0) { - return rv; - } - avail = nghttp2_bufs_cur_avail(bufs); - } - } - rembits = huff_encode_sym(bufs, &avail, rembits, sym); - if(rembits < 0) { - return (int)rembits; - } - } - /* 256 is special terminal symbol, pad with its prefix */ - if(rembits < 8) { - const nghttp2_huff_sym *sym = &huff_sym_table[256]; - - /* Caution we no longer adjust avail here */ - if(avail) { - nghttp2_bufs_fast_orb(bufs, sym->code >> (sym->nbits - rembits)); - } else { - rv = nghttp2_bufs_orb(bufs, sym->code >> (sym->nbits - rembits)); - if(rv != 0) { - return rv; - } - } - } - - return 0; -} - -void nghttp2_hd_huff_decode_context_init(nghttp2_hd_huff_decode_context *ctx) -{ - ctx->state = 0; - ctx->accept = 1; -} - -ssize_t nghttp2_hd_huff_decode(nghttp2_hd_huff_decode_context *ctx, - nghttp2_bufs *bufs, - const uint8_t *src, size_t srclen, int final) -{ - size_t i, j; - int rv; - size_t avail; - - avail = nghttp2_bufs_cur_avail(bufs); - - /* We use the decoding algorithm described in - http://graphics.ics.uci.edu/pub/Prefix.pdf */ - for(i = 0; i < srclen; ++i) { - uint8_t in = src[i] >> 4; - for(j = 0; j < 2; ++j) { - const nghttp2_huff_decode *t; - - t = &huff_decode_table[ctx->state][in]; - if(t->flags & NGHTTP2_HUFF_FAIL) { - return NGHTTP2_ERR_HEADER_COMP; - } - if(t->flags & NGHTTP2_HUFF_SYM) { - if(avail) { - nghttp2_bufs_fast_addb(bufs, t->sym); - --avail; - } else { - rv = nghttp2_bufs_addb(bufs, t->sym); - if(rv != 0) { - return rv; - } - avail = nghttp2_bufs_cur_avail(bufs); - } - } - ctx->state = t->state; - ctx->accept = (t->flags & NGHTTP2_HUFF_ACCEPTED) != 0; - in = src[i] & 0xf; - } - } - if(final && !ctx->accept) { - return NGHTTP2_ERR_HEADER_COMP; - } - return (ssize_t)i; -} |