/*--------------------------------------------------------------------------
NAME
HCIcszip_encode -- Encode data from a buffer into SZIP compressed data
USAGE
int32 HCIcszip_encode(info,length,buf)
compinfo_t *info; IN: the info about the compressed element
int32 length; IN: number of bytes to store from the buffer
const uint8 *buf; OUT: buffer to get the bytes from
RETURNS
Returns SUCCEED or FAIL
DESCRIPTION
Common code called to encode SZIP data into a file.
GLOBAL VARIABLES
COMMENTS, BUGS, ASSUMPTIONS
EXAMPLES
REVISION LOG
--------------------------------------------------------------------------*/
PRIVATE int32
HCIcszip_encode(compinfo_t * info, int32 length, const uint8 *buf)
{
CONSTR(FUNC, "HCIcszip_encode");
#ifdef H4_HAVE_SZIP_ENCODER
int bytes_per_pixel;
comp_coder_szip_info_t *szip_info; /* ptr to SZIP info */
int32 buffer_size;
if (SZ_encoder_enabled() == 0)
HRETURN_ERROR(DFE_NOENCODER, FAIL);
szip_info = &(info->cinfo.coder_info.szip_info);
if (szip_info->szip_state == SZIP_INIT) {
/* Need to initialize */
bytes_per_pixel = (szip_info->bits_per_pixel + 7) >> 3;
if (bytes_per_pixel == 3)
bytes_per_pixel = 4;
buffer_size = szip_info->pixels * bytes_per_pixel;
if ((szip_info->buffer = HDmalloc(buffer_size)) == NULL)
HRETURN_ERROR(DFE_NOSPACE, FAIL);
szip_info->buffer_size = buffer_size;
szip_info->buffer_pos = 0;
szip_info->szip_state = SZIP_RUN;
}
int set_szip( int pixels_per_block, /*in */
int compression_mode, /* in */
comp_info *c_info/*out*/)
{
#ifdef H4_HAVE_LIBSZ
int ppb=pixels_per_block;
if (SZ_encoder_enabled() == 0) {
printf("Warning: SZIP encoder is not enabled\n");
return -1;
}
if ( (compression_mode!=NN_MODE) && (compression_mode!=EC_MODE))
{
printf("SZIP compression mode must be NN_MODE or EC_MODE");
return -1;
}
/*
pixels_per_block must be an even number, and <= pixels_per_scanline
and <= SZ_MAX_PIXELS_PER_BLOCK
*/
if (pixels_per_block & 1)
{
printf("Pixels per block must be even.\n");
return -1;
}
if (ppb < 2 || ppb > 32) {
printf("Pixels per block must be 2-32.\n");
return -1;
}
c_info->szip.pixels_per_block = ppb;
/* set according to input value */
c_info->szip.options_mask = SZ_EC_OPTION_MASK;
if (compression_mode == EC_MODE) {
c_info->szip.options_mask = SZ_EC_OPTION_MASK;
} else if (compression_mode == NN_MODE) {
c_info->szip.options_mask = SZ_NN_OPTION_MASK;
}
c_info->szip.options_mask |= SZ_RAW_OPTION_MASK;
return 0;
#else
printf("Warning: SZIP compression is not available\n");
return -1;
#endif
}