Electroneum
slow_memmem.cpp
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30 // Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
31 
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <unistd.h>
35 #include <string.h>
36 #include <stdint.h>
37 #include "gtest/gtest.h"
38 
39 // OS X, FreeBSD, and OpenBSD don't need malloc.h
40 #if !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__OpenBSD__) && \
41  !defined(__DragonFly__)
42  #include <malloc.h>
43 #endif
44 
45 //#define TEST_ORIGINAL
46 //#define VERBOSE
47 
48 #ifdef TEST_ORIGINAL
49 size_t slow_memmem_original(void* start_buff, size_t buflen,void* pat,size_t patlen)
50 {
51  void* buf = start_buff;
52  void* end=(char*)buf+buflen-patlen;
53  while((buf=memchr(buf,((char*)pat)[0],buflen)))
54  {
55  if(buf>end)
56  return 0;
57  if(memcmp(buf,pat,patlen)==0)
58  return (char*)buf - (char*)start_buff;
59  buf=(char*)buf+1;
60  }
61  return 0;
62 }
63 
64 #define slow_memmem slow_memmem_original
65 #else
66 namespace cryptonote {
67  size_t slow_memmem(const void* start_buff, size_t buflen,const void* pat,size_t patlen);
68 }
69 using namespace cryptonote;
70 #endif
71 
72 static const struct {
73  size_t buflen;
74  const char *buf;
75  size_t patlen;
76  const char *pat;
77  size_t res;
78 } T[]={
79  {0,"",0,"",0},
80  {1,"",0,"",0},
81  {0,"",1,"",0},
82  {1,"x",1,"x",0},
83  {2,"x",1,"",1},
84  {1,"x",1,"",0},
85  {1,"x",2,"x",0},
86  {2,"ax",2,"x",0},
87  {1,"xx",2,"xx",0},
88  {4,"abcd",3,"abc",0},
89  {4,"abcd",3,"bcd",1},
90  {4,"abcd",4,"abcd",0},
91  {4,"abcd",1,"d",3},
92  {4,"abcd",1,"c",2},
93  {4,"abcd",1,"bc",1},
94  {4,"abcd",1,"",0},
95  {3,"abcd",1,"d",0},
96  {5,"aaaab",2,"ab",3},
97  {7,"aaaabab",2,"ab",3},
98  {7,"aaaabab",3,"abc",0},
99  {4,"abcd",2,"cd",2},
100  {3,"abcd",2,"cd",0},
101  {3,"a\0b",1,"",1},
102  {3,"a\0b",2,"\0b",1},
103  {8,"xxxxxxab",3,"xyz",0},
104  {8,"xxxxxxab",6,"abcdef",0},
105  {9,"\0xxxxxab",3,"ab",6},
106  {4,"\0\0a",3,"\0a",1}, //
107 };
108 
109 TEST(slowmem,Success)
110 {
111  size_t n;
112  for (n=0;n<sizeof(T)/sizeof(T[0]);++n) {
113 #ifdef VERBOSE
114  printf("%3zu: ",n);
115  fflush(stdout);
116 #endif
117  void *buf=malloc(T[n].buflen);
118  memcpy(buf,T[n].buf,T[n].buflen);
119  void *pat=malloc(T[n].patlen);
120  memcpy(pat,T[n].pat,T[n].patlen);
121  size_t res=slow_memmem(buf,T[n].buflen,pat,T[n].patlen);
122  free(pat);
123  free(buf);
124  ASSERT_EQ(res,T[n].res);
125 #ifdef VERBOSE
126  if (res!=T[n].res) printf("failed (got %zu, expected %zu)",res,T[n].res); else printf("ok");
127  printf("\n");
128 #endif
129  }
130 }
const uint32_t T[512]
size_t buflen
Definition: slow_memmem.cpp:73
Holds cryptonote related classes and helpers.
Definition: ban.cpp:40
#define ASSERT_EQ(val1, val2)
Definition: gtest.h:1956
size_t res
Definition: slow_memmem.cpp:77
const char * buf
Definition: slow_memmem.cpp:74
size_t patlen
Definition: slow_memmem.cpp:75
size_t slow_memmem(const void *start_buff, size_t buflen, const void *pat, size_t patlen)
TEST(slowmem, Success)
void * memcpy(void *a, const void *b, size_t c)
const char * pat
Definition: slow_memmem.cpp:76