file with the i/o code for binary bufr2tac More...
#include "bufr2tac.h"
Include dependency graph for bufr2tac_io.c:
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Functions | |
| int | read_bufr (unsigned char *bufr, char *filename, int *length) |
| read a bufr file as an array of unsigned chars More... | |
Detailed Description
file with the i/o code for binary bufr2tac
Definition in file bufr2tac_io.c.
Function Documentation
◆ read_bufr()
| int read_bufr | ( | unsigned char * | bufr, |
| char * | filename, | ||
| int * | length | ||
| ) |
read a bufr file as an array of unsigned chars
- Parameters
-
bufr pointer to an array of unsigned chars. On output it will contain the bufr filename string with complete pathname of bufr file to read length On input max length allocated by caller. On output real length of bufr
Definition at line 34 of file bufr2tac_io.c.
35{
36 int aux;
37 size_t n = 0;
38 FILE *fp;
39
40 /* Open input file */
41 if ( ( fp = fopen ( filename, "r" ) ) == NULL )
42 {
43 fprintf ( stderr, "cannot open file '%s'\n", filename );
44 exit ( EXIT_FAILURE );
45 }
46
47 while ( ( aux = fgetc ( fp ) ) != EOF && ( int ) n < *length )
48 bufr[n++] = aux;
49 *length = n;
50
51 // close the file
52 fclose ( fp );
53
54 if ( n < 8 ) // we need at least 8 bytes
55 return -4;
56
57 // check if begins with BUFR
58 if ( bufr[0] != 'B' || bufr[1] != 'U' || bufr[2] != 'F' || bufr[3] != 'R' )
59 return -1;
60
61 // check if end with '7777'
62 if ( bufr[n - 4] != '7' || bufr[n - 3] != '7' || bufr[n - 2] != '7'
63 || bufr[n - 1] != '7' )
64 return -2;
65
66 //printf("%d %d\n", n, three_bytes_to_uint(bufr + 4));
67 // check about the expected size
69 return -3;
70
71 return 0;
72}
unsigned int three_bytes_to_uint(const unsigned char *source)
returns the integer value from an array of three bytes, most significant first
Definition: bufr2tac_utils.c:30
References three_bytes_to_uint().
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