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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	src/b64.c	Lines:	48	83	57.8 %
Date:	2020-12-10 21:44:00	Branches:	30	58	51.7 %


/**
 * `encode.c' - b64
 *
 * copyright (c) 2014 joseph werle
 */

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include "b64.h"

char *
b64_encode (const unsigned char *src, size_t len) {
    int i = 0;
    int j = 0;
    char *enc = NULL;
    size_t size = 0;
    unsigned char buf[4];
    unsigned char tmp[3];

    // alloc
    enc = (char *) b64_malloc(1);
    if (NULL == enc) { return NULL; }

    // parse until end of source
    while (len--) {
        // read up to 3 bytes at a time into `tmp'
        tmp[i++] = *(src++);

        // if 3 bytes read then encode into `buf'
        if (3 == i) {
            buf[0] = (tmp[0] & 0xfc) >> 2;
            buf[1] = ((tmp[0] & 0x03) << 4) + ((tmp[1] & 0xf0) >> 4);
            buf[2] = ((tmp[1] & 0x0f) << 2) + ((tmp[2] & 0xc0) >> 6);
            buf[3] = tmp[2] & 0x3f;

            // allocate 4 new byts for `enc` and
            // then translate each encoded buffer
            // part by index from the base 64 index table
            // into `enc' unsigned char array
            enc = (char *) b64_realloc(enc, size + 4);
            for (i = 0; i < 4; ++i) {
                enc[size++] = b64_table[buf[i]];
            }

            // reset index
            i = 0;
        }
    }

    // remainder
    if (i > 0) {
        // fill `tmp' with `\0' at most 3 times
        for (j = i; j < 3; ++j) {
            tmp[j] = '\0';
        }

        // perform same codec as above
        buf[0] = (tmp[0] & 0xfc) >> 2;
        buf[1] = ((tmp[0] & 0x03) << 4) + ((tmp[1] & 0xf0) >> 4);
        buf[2] = ((tmp[1] & 0x0f) << 2) + ((tmp[2] & 0xc0) >> 6);
        buf[3] = tmp[2] & 0x3f;

        // perform same write to `enc` with new allocation
        for (j = 0; (j < i + 1); ++j) {
            enc = (char *) b64_realloc(enc, size + 1);
            enc[size++] = b64_table[buf[j]];
        }

        // while there is still a remainder
        // append `=' to `enc'
        while ((i++ < 3)) {
            enc = (char *) b64_realloc(enc, size + 1);
            enc[size++] = '=';
        }
    }

    // Make sure we have enough space to add '\0' character at end.
    enc = (char *) b64_realloc(enc, size + 1);
    enc[size] = '\0';

    return enc;
}

unsigned char *b64_decode_ex (const char *src, size_t len, size_t *decsize) {
    int i = 0;
    int j = 0;
    int l = 0;
    size_t size = 0;
    unsigned char *dec = NULL;
    unsigned char buf[3];
    unsigned char tmp[4];

    // alloc
    dec = (unsigned char *) b64_malloc(1);
    if (NULL == dec) { return NULL; }

    // parse until end of source
    while (len--) {
        // break if char is `=' or not base64 char
        if ('=' == src[j]) { break; }
        if (!(isalnum(src[j]) || '+' == src[j] || '/' == src[j])) { break; }

        // read up to 4 bytes at a time into `tmp'
        tmp[i++] = src[j++];

        // if 4 bytes read then decode into `buf'
        if (4 == i) {
            // translate values in `tmp' from table
            for (i = 0; i < 4; ++i) {
                // find translation char in `b64_table'
                for (l = 0; l < 64; ++l) {
                    if (tmp[i] == b64_table[l]) {
                        tmp[i] = l;
                        break;
                    }
                }
            }

            // decode
            buf[0] = (tmp[0] << 2) + ((tmp[1] & 0x30) >> 4);
            buf[1] = ((tmp[1] & 0xf) << 4) + ((tmp[2] & 0x3c) >> 2);
            buf[2] = ((tmp[2] & 0x3) << 6) + tmp[3];

            // write decoded buffer to `dec'
            dec = (unsigned char *) b64_realloc(dec, size + 3);
            if (dec != NULL){
                for (i = 0; i < 3; ++i) {
                    dec[size++] = buf[i];
                }
            } else {
                return NULL;
            }

            // reset
            i = 0;
        }
    }

    // remainder
    if (i > 0) {
        // fill `tmp' with `\0' at most 4 times
        for (j = i; j < 4; ++j) {
            tmp[j] = '\0';
        }

        // translate remainder
        for (j = 0; j < 4; ++j) {
            // find translation char in `b64_table'
            for (l = 0; l < 64; ++l) {
                if (tmp[j] == b64_table[l]) {
                    tmp[j] = l;
                    break;
                }
            }
        }

        // decode remainder
        buf[0] = (tmp[0] << 2) + ((tmp[1] & 0x30) >> 4);
        buf[1] = ((tmp[1] & 0xf) << 4) + ((tmp[2] & 0x3c) >> 2);
        buf[2] = ((tmp[2] & 0x3) << 6) + tmp[3];

        // write remainer decoded buffer to `dec'
        dec = (unsigned char *) b64_realloc(dec, size + (i - 1));
        if (dec != NULL){
            for (j = 0; (j < i - 1); ++j) {
                dec[size++] = buf[j];
            }
        } else {
            return NULL;
        }
    }

    // Make sure we have enough space to add '\0' character at end.
    dec = (unsigned char *) b64_realloc(dec, size + 1);
    if (dec != NULL){
        dec[size] = '\0';
    } else {
        return NULL;
    }

    // Return back the size of decoded string if demanded.
    if (decsize != NULL) {
        *decsize = size;
    }

    return dec;
}


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/**
2			* `encode.c' - b64
3			*
4			* copyright (c) 2014 joseph werle
5			*/
6
7			#include <stdio.h>
8			#include <stdlib.h>
9			#include <ctype.h>
10			#include "b64.h"
11
12			char *
13			b64_encode (const unsigned char *src, size_t len) {
14			int i = 0;
15			int j = 0;
16			char *enc = NULL;
17			size_t size = 0;
18			unsigned char buf[4];
19			unsigned char tmp[3];
20
21			// alloc
22			enc = (char *) b64_malloc(1);
23			if (NULL == enc) { return NULL; }
24
25			// parse until end of source
26			while (len--) {
27			// read up to 3 bytes at a time into `tmp'
28			tmp[i++] = *(src++);
29
30			// if 3 bytes read then encode into `buf'
31			if (3 == i) {
32			buf[0] = (tmp[0] & 0xfc) >> 2;
33			buf[1] = ((tmp[0] & 0x03) << 4) + ((tmp[1] & 0xf0) >> 4);
34			buf[2] = ((tmp[1] & 0x0f) << 2) + ((tmp[2] & 0xc0) >> 6);
35			buf[3] = tmp[2] & 0x3f;
36
37			// allocate 4 new byts for `enc` and
38			// then translate each encoded buffer
39			// part by index from the base 64 index table
40			// into `enc' unsigned char array
41			enc = (char *) b64_realloc(enc, size + 4);
42			for (i = 0; i < 4; ++i) {
43			enc[size++] = b64_table[buf[i]];
44			}
45
46			// reset index
47			i = 0;
48			}
49			}
50
51			// remainder
52			if (i > 0) {
53			// fill `tmp' with `\0' at most 3 times
54			for (j = i; j < 3; ++j) {
55			tmp[j] = '\0';
56			}
57
58			// perform same codec as above
59			buf[0] = (tmp[0] & 0xfc) >> 2;
60			buf[1] = ((tmp[0] & 0x03) << 4) + ((tmp[1] & 0xf0) >> 4);
61			buf[2] = ((tmp[1] & 0x0f) << 2) + ((tmp[2] & 0xc0) >> 6);
62			buf[3] = tmp[2] & 0x3f;
63
64			// perform same write to `enc` with new allocation
65			for (j = 0; (j < i + 1); ++j) {
66			enc = (char *) b64_realloc(enc, size + 1);
67			enc[size++] = b64_table[buf[j]];
68			}
69
70			// while there is still a remainder
71			// append `=' to `enc'
72			while ((i++ < 3)) {
73			enc = (char *) b64_realloc(enc, size + 1);
74			enc[size++] = '=';
75			}
76			}
77
78			// Make sure we have enough space to add '\0' character at end.
79			enc = (char *) b64_realloc(enc, size + 1);
80			enc[size] = '\0';
81
82			return enc;
83			}
84
85		10	unsigned char b64_decode_ex (const char src, size_t len, size_t *decsize) {
86		10	int i = 0;
87		10	int j = 0;
88		10	int l = 0;
89		10	size_t size = 0;
90		10	unsigned char *dec = NULL;
91		10	unsigned char buf[3];
92		10	unsigned char tmp[4];
93
94			// alloc
95		10	dec = (unsigned char *) b64_malloc(1);
96	✓✗	10	if (NULL == dec) { return NULL; }
97
98			// parse until end of source
99	✓✓	192	while (len--) {
100			// break if char is `=' or not base64 char
101	✓✓	190	if ('=' == src[j]) { break; }
102	✗✓✗✗ ✗✗	182	if (!(isalnum(src[j]) \|\| '+' == src[j] \|\| '/' == src[j])) { break; }
103
104			// read up to 4 bytes at a time into `tmp'
105		182	tmp[i++] = src[j++];
106
107			// if 4 bytes read then decode into `buf'
108	✓✓	182	if (4 == i) {
109			// translate values in `tmp' from table
110	✓✓	200	for (i = 0; i < 4; ++i) {
111			// find translation char in `b64_table'
112	✓✗	4352	for (l = 0; l < 64; ++l) {
113	✓✓	4352	if (tmp[i] == b64_table[l]) {
114		160	tmp[i] = l;
115		160	break;
116			}
117			}
118			}
119
120			// decode
121		40	buf[0] = (tmp[0] << 2) + ((tmp[1] & 0x30) >> 4);
122		40	buf[1] = ((tmp[1] & 0xf) << 4) + ((tmp[2] & 0x3c) >> 2);
123		40	buf[2] = ((tmp[2] & 0x3) << 6) + tmp[3];
124
125			// write decoded buffer to `dec'
126		40	dec = (unsigned char *) b64_realloc(dec, size + 3);
127	✓✗	40	if (dec != NULL){
128	✓✓	160	for (i = 0; i < 3; ++i) {
129		120	dec[size++] = buf[i];
130			}
131			} else {
132			return NULL;
133			}
134
135			// reset
136			i = 0;
137			}
138			}
139
140			// remainder
141	✓✗	10	if (i > 0) {
142			// fill `tmp' with `\0' at most 4 times
143	✓✓	28	for (j = i; j < 4; ++j) {
144		18	tmp[j] = '\0';
145			}
146
147			// translate remainder
148	✓✓	50	for (j = 0; j < 4; ++j) {
149			// find translation char in `b64_table'
150	✓✓	1752	for (l = 0; l < 64; ++l) {
151	✓✓	1734	if (tmp[j] == b64_table[l]) {
152		22	tmp[j] = l;
153		22	break;
154			}
155			}
156			}
157
158			// decode remainder
159		10	buf[0] = (tmp[0] << 2) + ((tmp[1] & 0x30) >> 4);
160		10	buf[1] = ((tmp[1] & 0xf) << 4) + ((tmp[2] & 0x3c) >> 2);
161		10	buf[2] = ((tmp[2] & 0x3) << 6) + tmp[3];
162
163			// write remainer decoded buffer to `dec'
164		10	dec = (unsigned char *) b64_realloc(dec, size + (i - 1));
165	✓✗	10	if (dec != NULL){
166	✓✓	22	for (j = 0; (j < i - 1); ++j) {
167		12	dec[size++] = buf[j];
168			}
169			} else {
170			return NULL;
171			}
172			}
173
174			// Make sure we have enough space to add '\0' character at end.
175		10	dec = (unsigned char *) b64_realloc(dec, size + 1);
176	✓✗	10	if (dec != NULL){
177		10	dec[size] = '\0';
178			} else {
179			return NULL;
180			}
181
182			// Return back the size of decoded string if demanded.
183	✓✗	10	if (decsize != NULL) {
184		10	*decsize = size;
185			}
186
187		10	return dec;
188			}