110 lines
4.1 KiB
C
110 lines
4.1 KiB
C
/* Copyright (c) 2001 Matej Pfajfar.
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* Copyright (c) 2001-2004, Roger Dingledine.
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* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
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* Copyright (c) 2007-2016, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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/**
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* \file buffers.h
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* \brief Header file for buffers.c.
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**/
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#ifndef TOR_BUFFERS_H
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#define TOR_BUFFERS_H
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#include "testsupport.h"
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buf_t *buf_new(void);
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buf_t *buf_new_with_capacity(size_t size);
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size_t buf_get_default_chunk_size(const buf_t *buf);
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void buf_free(buf_t *buf);
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void buf_clear(buf_t *buf);
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buf_t *buf_copy(const buf_t *buf);
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MOCK_DECL(size_t, buf_datalen, (const buf_t *buf));
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size_t buf_allocation(const buf_t *buf);
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size_t buf_slack(const buf_t *buf);
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uint32_t buf_get_oldest_chunk_timestamp(const buf_t *buf, uint32_t now);
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size_t buf_get_total_allocation(void);
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int read_to_buf(tor_socket_t s, size_t at_most, buf_t *buf, int *reached_eof,
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int *socket_error);
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int read_to_buf_tls(tor_tls_t *tls, size_t at_most, buf_t *buf);
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int flush_buf(tor_socket_t s, buf_t *buf, size_t sz, size_t *buf_flushlen);
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int flush_buf_tls(tor_tls_t *tls, buf_t *buf, size_t sz, size_t *buf_flushlen);
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int write_to_buf(const char *string, size_t string_len, buf_t *buf);
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int write_to_buf_zlib(buf_t *buf, tor_zlib_state_t *state,
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const char *data, size_t data_len, int done);
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int move_buf_to_buf(buf_t *buf_out, buf_t *buf_in, size_t *buf_flushlen);
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int fetch_from_buf(char *string, size_t string_len, buf_t *buf);
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int fetch_var_cell_from_buf(buf_t *buf, var_cell_t **out, int linkproto);
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int fetch_from_buf_http(buf_t *buf,
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char **headers_out, size_t max_headerlen,
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char **body_out, size_t *body_used, size_t max_bodylen,
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int force_complete);
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socks_request_t *socks_request_new(void);
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void socks_request_free(socks_request_t *req);
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int fetch_from_buf_socks(buf_t *buf, socks_request_t *req,
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int log_sockstype, int safe_socks);
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int fetch_from_buf_socks_client(buf_t *buf, int state, char **reason);
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int fetch_from_buf_line(buf_t *buf, char *data_out, size_t *data_len);
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int peek_buf_has_control0_command(buf_t *buf);
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int fetch_ext_or_command_from_buf(buf_t *buf, ext_or_cmd_t **out);
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int buf_set_to_copy(buf_t **output,
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const buf_t *input);
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void assert_buf_ok(buf_t *buf);
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#ifdef BUFFERS_PRIVATE
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STATIC int buf_find_string_offset(const buf_t *buf, const char *s, size_t n);
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STATIC void buf_pullup(buf_t *buf, size_t bytes);
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#ifdef TOR_UNIT_TESTS
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void buf_get_first_chunk_data(const buf_t *buf, const char **cp, size_t *sz);
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buf_t *buf_new_with_data(const char *cp, size_t sz);
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#endif
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STATIC size_t preferred_chunk_size(size_t target);
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#define DEBUG_CHUNK_ALLOC
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/** A single chunk on a buffer. */
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typedef struct chunk_t {
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struct chunk_t *next; /**< The next chunk on the buffer. */
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size_t datalen; /**< The number of bytes stored in this chunk */
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size_t memlen; /**< The number of usable bytes of storage in <b>mem</b>. */
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#ifdef DEBUG_CHUNK_ALLOC
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size_t DBG_alloc;
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#endif
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char *data; /**< A pointer to the first byte of data stored in <b>mem</b>. */
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uint32_t inserted_time; /**< Timestamp in truncated ms since epoch
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* when this chunk was inserted. */
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char mem[FLEXIBLE_ARRAY_MEMBER]; /**< The actual memory used for storage in
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* this chunk. */
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} chunk_t;
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/** Magic value for buf_t.magic, to catch pointer errors. */
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#define BUFFER_MAGIC 0xB0FFF312u
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/** A resizeable buffer, optimized for reading and writing. */
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struct buf_t {
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uint32_t magic; /**< Magic cookie for debugging: Must be set to
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* BUFFER_MAGIC. */
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size_t datalen; /**< How many bytes is this buffer holding right now? */
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size_t default_chunk_size; /**< Don't allocate any chunks smaller than
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* this for this buffer. */
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chunk_t *head; /**< First chunk in the list, or NULL for none. */
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chunk_t *tail; /**< Last chunk in the list, or NULL for none. */
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};
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#endif
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#ifdef BUFFERS_PRIVATE
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STATIC int buf_http_find_content_length(const char *headers, size_t headerlen,
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size_t *result_out);
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#endif
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#endif
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