NAME

rle_get_setup - Read the header from an RLE file.

rle_get_setup_ok - Print error message and exit if rle_get_setup fails.

rle_get_error - Print error message for rle_get_setup failure.

rle_debug - Turn on or off debugging messages.

SYNOPSIS

#include <rle.h>

rle_get_setup( the_hdr );
rle_hdr * the_hdr;

rle_get_setup_ok( the_hdr, prog_name, file_name );
rle_hdr * the_hdr;
char * prog_name, * file_name;

rle_get_error( code, prog_name, file_name )
int code;
char *prog_name, *file_name;

rle_debug( on_off )
int on_off;

DESCRIPTION

Rle_get_setup is called to initialize the process of reading an RLE(5) file. It will fill in the_hdr with the header information from the RLE file, and will initialize state for rle_getrow(3) and rle_getraw(3). The rle_file field of the_hdr should be initialized to the input stream before calling rle_get_setup. The bits field is initialized by rle_get_setup to enable reading of all the channels present in the input file. To prevent rle_getrow or rle_getraw from reading certain channels (e.g., the alpha channel), the appropriate bits should be cleared before calling them. The error codes returned by rle_get_setup are defined in rle.h.

Rle_get_setup_ok invokes rle_get_setup and checks the return code. If an error occurred, it calls rle_get_error( err_code, prog_name, file_name ) to print the appropriate error message on stderr, and the program exits with the status code set.

Rle_get_error can be called to print an appropriate error message on the standard error output for the failure code returned by rle_get_setup. The prog_name and file_name parameters are used for the error message. If file_name is NULL or "-", the string "Standard input" is substituted.

The function rle_debug is used to enable or disable debug printing for the rle_get functions. If on_off is non-zero, all input read from any RLE file will be printed in a readable form on the standard error output. Calling rle_debug(0) will turn off this activity.

AUTHOR

Spencer W. Thomas, Todd Fuqua
University of Utah

NAME

SYNOPSIS

DESCRIPTION

SEE ALSO

AUTHOR