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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	base64-inl.h	Lines:	82	83	98.8 %
Date:	2022-08-28 04:20:35	Branches:	73	111	65.8 %


#ifndef SRC_BASE64_INL_H_
#define SRC_BASE64_INL_H_

#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#include "base64.h"
#include "libbase64.h"
#include "util.h"

namespace node {

extern const int8_t unbase64_table[256];


inline static int8_t unbase64(uint8_t x) {
  return unbase64_table[x];
}


inline uint32_t ReadUint32BE(const unsigned char* p) {
  return static_cast<uint32_t>(p[0] << 24U) |
         static_cast<uint32_t>(p[1] << 16U) |
         static_cast<uint32_t>(p[2] << 8U) |
         static_cast<uint32_t>(p[3]);
}

#ifdef _MSC_VER
#pragma warning(push)
// MSVC C4003: not enough actual parameters for macro 'identifier'
#pragma warning(disable : 4003)
#endif

template <typename TypeName>
bool base64_decode_group_slow(char* const dst, const size_t dstlen,
                              const TypeName* const src, const size_t srclen,
                              size_t* const i, size_t* const k) {
  uint8_t hi;
  uint8_t lo;
#define V(expr)                                                                \
  for (;;) {                                                                   \
    const uint8_t c = static_cast<uint8_t>(src[*i]);                           \
    lo = unbase64(c);                                                          \
    *i += 1;                                                                   \
    if (lo < 64) break;                         /* Legal character. */         \
    if (c == '=' || *i >= srclen) return false; /* Stop decoding. */           \
  }                                                                            \
  expr;                                                                        \
  if (*i >= srclen) return false;                                              \
  if (*k >= dstlen) return false;                                              \
  hi = lo;
  V(/* Nothing. */);
  V(dst[(*k)++] = ((hi & 0x3F) << 2) | ((lo & 0x30) >> 4));
  V(dst[(*k)++] = ((hi & 0x0F) << 4) | ((lo & 0x3C) >> 2));
  V(dst[(*k)++] = ((hi & 0x03) << 6) | ((lo & 0x3F) >> 0));
#undef V
  return true;  // Continue decoding.
}

#ifdef _MSC_VER
#pragma warning(pop)
#endif

template <typename TypeName>
size_t base64_decode_fast(char* const dst, const size_t dstlen,
                          const TypeName* const src, const size_t srclen,
                          const size_t decoded_size) {
  const size_t available = dstlen < decoded_size ? dstlen : decoded_size;
  const size_t max_k = available / 3 * 3;
  size_t max_i = srclen / 4 * 4;
  size_t i = 0;
  size_t k = 0;
  while (i < max_i && k < max_k) {
    const unsigned char txt[] = {
        static_cast<unsigned char>(unbase64(static_cast<uint8_t>(src[i + 0]))),
        static_cast<unsigned char>(unbase64(static_cast<uint8_t>(src[i + 1]))),
        static_cast<unsigned char>(unbase64(static_cast<uint8_t>(src[i + 2]))),
        static_cast<unsigned char>(unbase64(static_cast<uint8_t>(src[i + 3]))),
    };

    const uint32_t v = ReadUint32BE(txt);
    // If MSB is set, input contains whitespace or is not valid base64.
    if (v & 0x80808080) {
      if (!base64_decode_group_slow(dst, dstlen, src, srclen, &i, &k))
        return k;
      max_i = i + (srclen - i) / 4 * 4;  // Align max_i again.
    } else {
      dst[k + 0] = ((v >> 22) & 0xFC) | ((v >> 20) & 0x03);
      dst[k + 1] = ((v >> 12) & 0xF0) | ((v >> 10) & 0x0F);
      dst[k + 2] = ((v >>  2) & 0xC0) | ((v >>  0) & 0x3F);
      i += 4;
      k += 3;
    }
  }
  if (i < srclen && k < dstlen) {
    base64_decode_group_slow(dst, dstlen, src, srclen, &i, &k);
  }
  return k;
}


template <typename TypeName>
size_t base64_decoded_size(const TypeName* src, size_t size) {
  // 1-byte input cannot be decoded
  if (size < 2)
    return 0;

  if (src[size - 1] == '=') {
    size--;
    if (src[size - 1] == '=')
      size--;
  }
  return base64_decoded_size_fast(size);
}


template <typename TypeName>
size_t base64_decode(char* const dst, const size_t dstlen,
                     const TypeName* const src, const size_t srclen) {
  const size_t decoded_size = base64_decoded_size(src, srclen);
  return base64_decode_fast(dst, dstlen, src, srclen, decoded_size);
}


inline size_t base64_encode(const char* src,
                            size_t slen,
                            char* dst,
                            size_t dlen,
                            Base64Mode mode) {
  // We know how much we'll write, just make sure that there's space.
  CHECK(dlen >= base64_encoded_size(slen, mode) &&
        "not enough space provided for base64 encode");

  dlen = base64_encoded_size(slen, mode);

  if (mode == Base64Mode::NORMAL) {
    ::base64_encode(src, slen, dst, &dlen, 0);
    return dlen;
  }

  unsigned a;
  unsigned b;
  unsigned c;
  unsigned i;
  unsigned k;
  unsigned n;

  const char* table = base64_select_table(mode);

  i = 0;
  k = 0;
  n = slen / 3 * 3;

  while (i < n) {
    a = src[i + 0] & 0xff;
    b = src[i + 1] & 0xff;
    c = src[i + 2] & 0xff;

    dst[k + 0] = table[a >> 2];
    dst[k + 1] = table[((a & 3) << 4) | (b >> 4)];
    dst[k + 2] = table[((b & 0x0f) << 2) | (c >> 6)];
    dst[k + 3] = table[c & 0x3f];

    i += 3;
    k += 4;
  }

  switch (slen - n) {
    case 1:
      a = src[i + 0] & 0xff;
      dst[k + 0] = table[a >> 2];
      dst[k + 1] = table[(a & 3) << 4];
      break;
    case 2:
      a = src[i + 0] & 0xff;
      b = src[i + 1] & 0xff;
      dst[k + 0] = table[a >> 2];
      dst[k + 1] = table[((a & 3) << 4) | (b >> 4)];
      dst[k + 2] = table[(b & 0x0f) << 2];
      break;
  }

  return dlen;
}

}  // namespace node

#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#endif  // SRC_BASE64_INL_H_


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			#ifndef SRC_BASE64_INL_H_
2			#define SRC_BASE64_INL_H_
3
4			#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
5
6			#include "base64.h"
7			#include "libbase64.h"
8			#include "util.h"
9
10			namespace node {
11
12			extern const int8_t unbase64_table[256];
13
14
15		18099157	inline static int8_t unbase64(uint8_t x) {
16		18099157	return unbase64_table[x];
17			}
18
19
20		4522939	inline uint32_t ReadUint32BE(const unsigned char* p) {
21		9045878	return static_cast<uint32_t>(p[0] << 24U) \|
22		9045878	static_cast<uint32_t>(p[1] << 16U) \|
23		4522939	static_cast<uint32_t>(p[2] << 8U) \|
24		4522939	static_cast<uint32_t>(p[3]);
25			}
26
27			#ifdef _MSC_VER
28			#pragma warning(push)
29			// MSVC C4003: not enough actual parameters for macro 'identifier'
30			#pragma warning(disable : 4003)
31			#endif
32
33			template <typename TypeName>
34		5975	bool base64_decode_group_slow(char* const dst, const size_t dstlen,
35			const TypeName* const src, const size_t srclen,
36			size_t* const i, size_t* const k) {
37			uint8_t hi;
38			uint8_t lo;
39			#define V(expr) \
40			for (;;) { \
41			const uint8_t c = static_cast<uint8_t>(src[*i]); \
42			lo = unbase64(c); \
43			*i += 1; \
44			if (lo < 64) break; /* Legal character. */ \
45			if (c == '=' \|\| i >= srclen) return false; / Stop decoding. */ \
46			} \
47			expr; \
48			if (*i >= srclen) return false; \
49			if (*k >= dstlen) return false; \
50			hi = lo;
51	✓✓✓✓ ✗✓✗✓ ✗✓✓✗ ✗✗✗✗ ✗✓✗✓	3019	V(/* Nothing. */);
52	✓✓✓✗ ✗✓✓✓ ✓✓✓✗ ✗✗✗✗ ✗✓✓✓	2938	V(dst[(*k)++] = ((hi & 0x3F) << 2) \| ((lo & 0x30) >> 4));
53	✓✓✓✓ ✓✓✓✓ ✓✓✓✓ ✗✓✗✗ ✗✓✓✗	1458	V(dst[(*k)++] = ((hi & 0x0F) << 4) \| ((lo & 0x3C) >> 2));
54	✓✓✓✓ ✗✓✓✓ ✗✓✗✗ ✗✗✗✗ ✗✗✗✗	90	V(dst[(*k)++] = ((hi & 0x03) << 6) \| ((lo & 0x3F) >> 0));
55			#undef V
56		70	return true; // Continue decoding.
57			}
58
59			#ifdef _MSC_VER
60			#pragma warning(pop)
61			#endif
62
63			template <typename TypeName>
64		7536	size_t base64_decode_fast(char* const dst, const size_t dstlen,
65			const TypeName* const src, const size_t srclen,
66			const size_t decoded_size) {
67	✓✓	7536	const size_t available = dstlen < decoded_size ? dstlen : decoded_size;
68		7536	const size_t max_k = available / 3 * 3;
69		7536	size_t max_i = srclen / 4 * 4;
70		7536	size_t i = 0;
71		7536	size_t k = 0;
72	✓✓✓✓	9052715	while (i < max_i && k < max_k) {
73		36180848	const unsigned char txt[] = {
74		9045212	static_cast<unsigned char>(unbase64(static_cast<uint8_t>(src[i + 0]))),
75		9045212	static_cast<unsigned char>(unbase64(static_cast<uint8_t>(src[i + 1]))),
76		9045212	static_cast<unsigned char>(unbase64(static_cast<uint8_t>(src[i + 2]))),
77		9045212	static_cast<unsigned char>(unbase64(static_cast<uint8_t>(src[i + 3]))),
78			};
79
80		9045212	const uint32_t v = ReadUint32BE(txt);
81			// If MSB is set, input contains whitespace or is not valid base64.
82	✓✓	9045212	if (v & 0x80808080) {
83	✓✓	151	if (!base64_decode_group_slow(dst, dstlen, src, srclen, &i, &k))
84		33	return k;
85		118	max_i = i + (srclen - i) / 4 * 4; // Align max_i again.
86			} else {
87		9045061	dst[k + 0] = ((v >> 22) & 0xFC) \| ((v >> 20) & 0x03);
88		9045061	dst[k + 1] = ((v >> 12) & 0xF0) \| ((v >> 10) & 0x0F);
89		9045061	dst[k + 2] = ((v >> 2) & 0xC0) \| ((v >> 0) & 0x3F);
90		9045061	i += 4;
91		9045061	k += 3;
92			}
93			}
94	✓✓✓✓	7503	if (i < srclen && k < dstlen) {
95		5658	base64_decode_group_slow(dst, dstlen, src, srclen, &i, &k);
96			}
97		7503	return k;
98			}
99
100
101			template <typename TypeName>
102		13946	size_t base64_decoded_size(const TypeName* src, size_t size) {
103			// 1-byte input cannot be decoded
104	✗✓	13946	if (size < 2)
105			return 0;
106
107	✓✓	13946	if (src[size - 1] == '=') {
108		812	size--;
109	✓✓	812	if (src[size - 1] == '=')
110		388	size--;
111			}
112		13946	return base64_decoded_size_fast(size);
113			}
114
115
116			template <typename TypeName>
117		7536	size_t base64_decode(char* const dst, const size_t dstlen,
118			const TypeName* const src, const size_t srclen) {
119		7536	const size_t decoded_size = base64_decoded_size(src, srclen);
120		7536	return base64_decode_fast(dst, dstlen, src, srclen, decoded_size);
121			}
122
123
124		6326	inline size_t base64_encode(const char* src,
125			size_t slen,
126			char* dst,
127			size_t dlen,
128			Base64Mode mode) {
129			// We know how much we'll write, just make sure that there's space.
130	✗✓✗✓	6326	CHECK(dlen >= base64_encoded_size(slen, mode) &&
131			"not enough space provided for base64 encode");
132
133		6326	dlen = base64_encoded_size(slen, mode);
134
135	✓✓	6326	if (mode == Base64Mode::NORMAL) {
136		1911	::base64_encode(src, slen, dst, &dlen, 0);
137		1911	return dlen;
138			}
139
140			unsigned a;
141			unsigned b;
142			unsigned c;
143			unsigned i;
144			unsigned k;
145			unsigned n;
146
147		4415	const char* table = base64_select_table(mode);
148
149		4415	i = 0;
150		4415	k = 0;
151		4415	n = slen / 3 * 3;
152
153	✓✓	107211	while (i < n) {
154		102796	a = src[i + 0] & 0xff;
155		102796	b = src[i + 1] & 0xff;
156		102796	c = src[i + 2] & 0xff;
157
158		102796	dst[k + 0] = table[a >> 2];
159		102796	dst[k + 1] = table[((a & 3) << 4) \| (b >> 4)];
160		102796	dst[k + 2] = table[((b & 0x0f) << 2) \| (c >> 6)];
161		102796	dst[k + 3] = table[c & 0x3f];
162
163		102796	i += 3;
164		102796	k += 4;
165			}
166
167	✓✓✓	4415	switch (slen - n) {
168		1407	case 1:
169		1407	a = src[i + 0] & 0xff;
170		1407	dst[k + 0] = table[a >> 2];
171		1407	dst[k + 1] = table[(a & 3) << 4];
172		1407	break;
173		1152	case 2:
174		1152	a = src[i + 0] & 0xff;
175		1152	b = src[i + 1] & 0xff;
176		1152	dst[k + 0] = table[a >> 2];
177		1152	dst[k + 1] = table[((a & 3) << 4) \| (b >> 4)];
178		1152	dst[k + 2] = table[(b & 0x0f) << 2];
179		1152	break;
180			}
181
182		4415	return dlen;
183			}
184
185			} // namespace node
186
187			#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
188
189			#endif // SRC_BASE64_INL_H_