Hex to ASCII in c
15,926
This is not an answer but an observation - using this since it formats code
static char lookup[] = { '0', '1', '2','3','4','5','6','7','8','9','A','B','C','D','E','F' };
int j = 0;
for (i=0; i<ArraySize; ++i)
{
loc[j++] = lookup[(Tmp[i] & 0xf0) >> 4];
loc[j++] = lookup[Tmp[i] & 0xf];
}
loc[j] = 0;
makes the code a lot quicker and simpler.
Author by
QMG
Updated on June 04, 2022Comments
-
QMG almost 2 years
Here is my logic, to convert HEX to ASCII conversion in C:
for (i=0;i<ArraySize;i++) { /*uses a bitwise AND to take the top 4 bits from the byte, 0xF0 is 11110000 in binary*/ char1 = Tmp[i] & 0xf0; char1 = char1 >> 4; /*bit-shift the result to the right by four bits (i.e. quickly divides by 16)*/ if (char1 >9) { char1 = char1 - 0xa; char1 = char1 + 'A'; } else char1 = char1 + '0'; Loc[j]=char1; j++; /*means use a bitwise AND to take the bottom four bits from the byte, 0x0F is 00001111 in binary*/ char1 = Tmp[i] & 0x0f; if (char1 >9) { char1 = char1 - 0xa; char1 = char1 + 'A'; } else char1 = char1 + '0'; Loc[j]=char1; j++; Loc[j]=0; }
Temp and Loc are string buffers. Defined and has data. It is not working properly. I am reading data in temp from some file (sample fread). It stop reading file at particular point. If I change first
0xf0
to
0x0f
Here is how file is being read:
BytesRead = fread (Tmp,1,Bytes,PrcFile);
Then it reads whole file. I am not able to find what is missing. Can you please help me in this regards. Thanks