Changeset 41474 for trunk/Ohana/src/libfits/matrix/F_uncompress_data.c

Timestamp:

Jan 24, 2021, 3:37:52 PM (5 years ago)

Author:

eugene

Message:

clarify in comments the buffers and pixel sizes used in the different stages of compression/uncompression; catch unimplemented compression cases; fix error in pixel size for RICE1; cleanup verbose code; use correct sscanf format code in ASCII table reading code

File:

• trunk/Ohana/src/libfits/matrix/F_uncompress_data.c (modified) (1 diff)

trunk/Ohana/src/libfits/matrix/F_uncompress_data.c

@@ -5 +5 @@
 
 # define ESCAPE(RET) { fprintf (stderr, "gzip error in %s @ %s:%d\n", __func__, __FILE__, __LINE__); return (RET); }
+
+/* This function uncompresses the data in 'zdata' into the pre-allocated output buffer 'outdata'.
+   The compression algorithm is chosen based on 'cmptype', with options specified by 'optname, optvalue, Nopt'
+   zdata : input compressed data, Nzdata : number of compressed BYTES
+   outdata : output buffer, Nout : number of actual output PIXELS, Nout_alloc : number of allocated bytes in the buffer, out_pixsize : bytes per output pixel
+ */
 
 int gfits_uncompress_data (char *zdata, unsigned long Nzdata, char *cmptype, char **optname, char **optvalue, int Nopt, char *outdata, unsigned long int *Nout, unsigned long int Nout_alloc, int out_pixsize) {