thodg/libgit2/src/netops.c

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• Hash : f0e693b1
  Author :
  Date : 2021-09-07T17:53:49
  

  str: introduce `git_str` for internal, `git_buf` is external
  
  libgit2 has two distinct requirements that were previously solved by
  `git_buf`.  We require:
  
  1. A general purpose string class that provides a number of utility APIs
     for manipulating data (eg, concatenating, truncating, etc).
  2. A structure that we can use to return strings to callers that they
     can take ownership of.
  
  By using a single class (`git_buf`) for both of these purposes, we have
  confused the API to the point that refactorings are difficult and
  reasoning about correctness is also difficult.
  
  Move the utility class `git_buf` to be called `git_str`: this represents
  its general purpose, as an internal string buffer class.  The name also
  is an homage to Junio Hamano ("gitstr").
  
  The public API remains `git_buf`, and has a much smaller footprint.  It
  is generally only used as an "out" param with strict requirements that
  follow the documentation.  (Exceptions exist for some legacy APIs to
  avoid breaking callers unnecessarily.)
  
  Utility functions exist to convert a user-specified `git_buf` to a
  `git_str` so that we can call internal functions, then converting it
  back again.
  

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• src/netops.c

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include "netops.h"
  
  #include <ctype.h>
  #include "git2/errors.h"
  
  #include "posix.h"
  #include "str.h"
  #include "http_parser.h"
  #include "runtime.h"
  
  int gitno_recv(gitno_buffer *buf)
  {
  	return buf->recv(buf);
  }
  
  void gitno_buffer_setup_callback(
  	gitno_buffer *buf,
  	char *data,
  	size_t len,
  	int (*recv)(gitno_buffer *buf), void *cb_data)
  {
  	memset(data, 0x0, len);
  	buf->data = data;
  	buf->len = len;
  	buf->offset = 0;
  	buf->recv = recv;
  	buf->cb_data = cb_data;
  }
  
  static int recv_stream(gitno_buffer *buf)
  {
  	git_stream *io = (git_stream *) buf->cb_data;
  	size_t readlen = buf->len - buf->offset;
  	ssize_t ret;
  
  	readlen = min(readlen, INT_MAX);
  
  	ret = git_stream_read(io, buf->data + buf->offset, (int)readlen);
  	if (ret < 0)
  		return -1;
  
  	buf->offset += ret;
  	return (int)ret;
  }
  
  void gitno_buffer_setup_fromstream(git_stream *st, gitno_buffer *buf, char *data, size_t len)
  {
  	memset(data, 0x0, len);
  	buf->data = data;
  	buf->len = len;
  	buf->offset = 0;
  	buf->recv = recv_stream;
  	buf->cb_data = st;
  }
  
  /* Consume up to ptr and move the rest of the buffer to the beginning */
  int gitno_consume(gitno_buffer *buf, const char *ptr)
  {
  	size_t consumed;
  
  	GIT_ASSERT(ptr - buf->data >= 0);
  	GIT_ASSERT(ptr - buf->data <= (int) buf->len);
  
  	consumed = ptr - buf->data;
  
  	memmove(buf->data, ptr, buf->offset - consumed);
  	memset(buf->data + buf->offset, 0x0, buf->len - buf->offset);
  	buf->offset -= consumed;
  
  	return 0;
  }
  
  /* Consume const bytes and move the rest of the buffer to the beginning */
  void gitno_consume_n(gitno_buffer *buf, size_t cons)
  {
  	memmove(buf->data, buf->data + cons, buf->len - buf->offset);
  	memset(buf->data + cons, 0x0, buf->len - buf->offset);
  	buf->offset -= cons;
  }
  
  /* Match host names according to RFC 2818 rules */
  int gitno__match_host(const char *pattern, const char *host)
  {
  	for (;;) {
  		char c = git__tolower(*pattern++);
  
  		if (c == '\0')
  			return *host ? -1 : 0;
  
  		if (c == '*') {
  			c = *pattern;
  			/* '*' at the end matches everything left */
  			if (c == '\0')
  				return 0;
  
  	/*
  	 * We've found a pattern, so move towards the next matching
  	 * char. The '.' is handled specially because wildcards aren't
  	 * allowed to cross subdomains.
  	 */
  
  			while(*host) {
  				char h = git__tolower(*host);
  				if (c == h)
  					return gitno__match_host(pattern, host++);
  				if (h == '.')
  					return gitno__match_host(pattern, host);
  				host++;
  			}
  			return -1;
  		}
  
  		if (c != git__tolower(*host++))
  			return -1;
  	}
  
  	return -1;
  }
  

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