/src/dropbear/src/circbuffer.c

Source (jump to first uncovered line)
/*
 * Dropbear SSH
 * 
 * Copyright (c) 2002-2004 Matt Johnston
 * All rights reserved.
 * 
 * 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 "includes.h"
#include "dbutil.h"
#include "circbuffer.h"

#define MAX_CBUF_SIZE 100000000

circbuffer * cbuf_new(unsigned int size) {

  circbuffer *cbuf = NULL;

  if (size > MAX_CBUF_SIZE) {
    dropbear_exit("Bad cbuf size");
  }

  cbuf = (circbuffer*)m_malloc(sizeof(circbuffer));
  /* data is malloced on first write */
  cbuf->data = NULL;
  cbuf->used = 0;
  cbuf->readpos = 0;
  cbuf->writepos = 0;
  cbuf->size = size;

  return cbuf;
}

void cbuf_free(circbuffer * cbuf) {

  if (cbuf->data) {
    m_burn(cbuf->data, cbuf->size);
    m_free(cbuf->data);
  }
  m_free(cbuf);
}

unsigned int cbuf_getused(const circbuffer * cbuf) {

  return cbuf->used;

}

unsigned int cbuf_getavail(const circbuffer * cbuf) {

  return cbuf->size - cbuf->used;

}

unsigned int cbuf_writelen(const circbuffer *cbuf) {

  dropbear_assert(cbuf->used <= cbuf->size);
  dropbear_assert(((2*cbuf->size)+cbuf->writepos-cbuf->readpos)%cbuf->size == cbuf->used%cbuf->size);
  dropbear_assert(((2*cbuf->size)+cbuf->readpos-cbuf->writepos)%cbuf->size == (cbuf->size-cbuf->used)%cbuf->size);

  if (cbuf->used == cbuf->size) {
    TRACE(("cbuf_writelen: full buffer"))
    return 0; /* full */
  }
  
  if (cbuf->writepos < cbuf->readpos) {
    return cbuf->readpos - cbuf->writepos;
  }

  return cbuf->size - cbuf->writepos;
}

void cbuf_readptrs(const circbuffer *cbuf,
  unsigned char **p1, unsigned int *len1, 
  unsigned char **p2, unsigned int *len2) {
  *p1 = &cbuf->data[cbuf->readpos];
  *len1 = MIN(cbuf->used, cbuf->size - cbuf->readpos);

  if (*len1 < cbuf->used) {
    *p2 = cbuf->data;
    *len2 = cbuf->used - *len1;
  } else {
    *p2 = NULL;
    *len2 = 0;
  }
}

unsigned char* cbuf_writeptr(circbuffer *cbuf, unsigned int len) {

  if (len > cbuf_writelen(cbuf)) {
    dropbear_exit("Bad cbuf write");
  }

  if (!cbuf->data) {
    /* lazy allocation */
    cbuf->data = (unsigned char*)m_malloc(cbuf->size);
  }

  return &cbuf->data[cbuf->writepos];
}

void cbuf_incrwrite(circbuffer *cbuf, unsigned int len) {
  if (len > cbuf_writelen(cbuf)) {
    dropbear_exit("Bad cbuf write");
  }

  cbuf->used += len;
  dropbear_assert(cbuf->used <= cbuf->size);
  cbuf->writepos = (cbuf->writepos + len) % cbuf->size;
}


void cbuf_incrread(circbuffer *cbuf, unsigned int len) {
  dropbear_assert(cbuf->used >= len);
  cbuf->used -= len;
  cbuf->readpos = (cbuf->readpos + len) % cbuf->size;
}

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Dropbear SSH
3		*
4		* Copyright (c) 2002-2004 Matt Johnston
5		* All rights reserved.
6		*
7		* Permission is hereby granted, free of charge, to any person obtaining a copy
8		* of this software and associated documentation files (the "Software"), to deal
9		* in the Software without restriction, including without limitation the rights
10		* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11		* copies of the Software, and to permit persons to whom the Software is
12		* furnished to do so, subject to the following conditions:
13		*
14		* The above copyright notice and this permission notice shall be included in
15		* all copies or substantial portions of the Software.
16		*
17		* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18		* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19		* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20		* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21		* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22		* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23		* SOFTWARE. */
24
25		#include "includes.h"
26		#include "dbutil.h"
27		#include "circbuffer.h"
28
29	4.80k	#define MAX_CBUF_SIZE 100000000
30
31	4.80k	circbuffer * cbuf_new(unsigned int size) {
32
33	4.80k	circbuffer *cbuf = NULL;
34
35	4.80k	if (size > MAX_CBUF_SIZE) {
36	0	dropbear_exit("Bad cbuf size");
37	0	}
38
39	4.80k	cbuf = (circbuffer*)m_malloc(sizeof(circbuffer));
40		/* data is malloced on first write */
41	4.80k	cbuf->data = NULL;
42	4.80k	cbuf->used = 0;
43	4.80k	cbuf->readpos = 0;
44	4.80k	cbuf->writepos = 0;
45	4.80k	cbuf->size = size;
46
47	4.80k	return cbuf;
48	4.80k	}
49
50	4.80k	void cbuf_free(circbuffer * cbuf) {
51
52	4.80k	if (cbuf->data) {
53	0	m_burn(cbuf->data, cbuf->size);
54	0	m_free(cbuf->data);
55	0	}
56	4.80k	m_free(cbuf);
57	4.80k	}
58
59	980k	unsigned int cbuf_getused(const circbuffer * cbuf) {
60
61	980k	return cbuf->used;
62
63	980k	}
64
65	33	unsigned int cbuf_getavail(const circbuffer * cbuf) {
66
67	33	return cbuf->size - cbuf->used;
68
69	33	}
70
71	0	unsigned int cbuf_writelen(const circbuffer *cbuf) {
72
73	0	dropbear_assert(cbuf->used <= cbuf->size);
74	0	dropbear_assert(((2*cbuf->size)+cbuf->writepos-cbuf->readpos)%cbuf->size == cbuf->used%cbuf->size);
75	0	dropbear_assert(((2*cbuf->size)+cbuf->readpos-cbuf->writepos)%cbuf->size == (cbuf->size-cbuf->used)%cbuf->size);
76
77	0	if (cbuf->used == cbuf->size) {
78	0	TRACE(("cbuf_writelen: full buffer"))
79	0	return 0; /* full */
80	0	}
81
82	0	if (cbuf->writepos < cbuf->readpos) {
83	0	return cbuf->readpos - cbuf->writepos;
84	0	}
85
86	0	return cbuf->size - cbuf->writepos;
87	0	}
88
89		void cbuf_readptrs(const circbuffer *cbuf,
90		unsigned char *p1, unsigned int len1,
91	15	unsigned char *p2, unsigned int len2) {
92	15	*p1 = &cbuf->data[cbuf->readpos];
93	15	*len1 = MIN(cbuf->used, cbuf->size - cbuf->readpos);
94
95	15	if (*len1 < cbuf->used) {
96	0	*p2 = cbuf->data;
97	0	len2 = cbuf->used - len1;
98	15	} else {
99	15	*p2 = NULL;
100	15	*len2 = 0;
101	15	}
102	15	}
103
104	0	unsigned char* cbuf_writeptr(circbuffer *cbuf, unsigned int len) {
105
106	0	if (len > cbuf_writelen(cbuf)) {
107	0	dropbear_exit("Bad cbuf write");
108	0	}
109
110	0	if (!cbuf->data) {
111		/* lazy allocation */
112	0	cbuf->data = (unsigned char*)m_malloc(cbuf->size);
113	0	}
114
115	0	return &cbuf->data[cbuf->writepos];
116	0	}
117
118	0	void cbuf_incrwrite(circbuffer *cbuf, unsigned int len) {
119	0	if (len > cbuf_writelen(cbuf)) {
120	0	dropbear_exit("Bad cbuf write");
121	0	}
122
123	0	cbuf->used += len;
124	0	dropbear_assert(cbuf->used <= cbuf->size);
125	0	cbuf->writepos = (cbuf->writepos + len) % cbuf->size;
126	0	}
127
128
129	0	void cbuf_incrread(circbuffer *cbuf, unsigned int len) {
130	0	dropbear_assert(cbuf->used >= len);
131	0	cbuf->used -= len;
132	0	cbuf->readpos = (cbuf->readpos + len) % cbuf->size;
133	0	}

Coverage Report

Created: 2023-03-20 06:33