decenc_aec.c

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#include "grib2_int.h"
#include <libaec.h>
#include <stdint.h>
#include <stdio.h>
 
int
dec_aec(unsigned char *cpack, g2int len, g2int nbits, g2int flags,
        g2int block_size, g2int rsi, unsigned char *cfld, g2int cfldlen)
{
    struct aec_stream strm;
    int ret = 0;
 
    /* Define bits per sample */
    strm.bits_per_sample = nbits;
    LOG((3, "dec_aec: bits_per_sample = %d", strm.bits_per_sample));
 
    /* Define a block size */
    LOG((3, "dec_aec: block_size = %d", block_size));
    strm.block_size = block_size;
 
    /* Define the reference sample interval */
    LOG((3, "dec_aec: rsi = %d", rsi));
    strm.rsi = rsi;
 
    /* Define the AEC compression flags. */
    strm.flags = flags;
    LOG((3, "dec_aec: flags = %d", strm.flags));
 
    /* Pointer to input */
    strm.next_in = cpack;
 
    /* Length of input in bytes */
    strm.avail_in = len;
    LOG((3, "dec_aec: avail_in = %d", strm.avail_in));
 
    /* Pointer to output buffer */
    strm.next_out = cfld;
 
    /* Length of output buffer in bytes */
    strm.avail_out = (size_t)cfldlen;
 
    /* Decode. */
    ret = aec_buffer_decode(&strm);
    LOG((3, "dec_aec: return from aec_buffer_encode = %d", ret));
    if (ret == AEC_OK)
        ret = strm.total_out;
 
    return ret;
}
 
int
enc_aec(unsigned char *data, g2int ctemplen, g2int nbits, g2int flags,
        g2int block_size, g2int rsi, unsigned char *aecbuf, g2int *aecbuflen)
{
    struct aec_stream strm;
    int ret = 0;
 
    /* Define bits per sample */
    strm.bits_per_sample = nbits;
    LOG((3, "enc_aec: bits_per_sample = %d", strm.bits_per_sample));
 
    /* Define a block size */
    LOG((3, "enc_aec: block_size = %d", block_size));
    strm.block_size = block_size;
 
    /* Define the reference sample interval */
    LOG((3, "enc_aec: rsi = %d", rsi));
    strm.rsi = rsi;
 
    /* Define the AEC compression flags. */
    strm.flags = flags;
    LOG((3, "enc_aec: flags = %d", strm.flags));
 
    /* Pointer to input */
    strm.next_in = data;
 
    /* Length of input in bytes */
    strm.avail_in = ctemplen;
    LOG((3, "enc_aec: avail_in = %d", strm.avail_in));
 
    /* Pointer to output buffer */
    strm.next_out = aecbuf;
 
    /* Length of output buffer in bytes */
    strm.avail_out = (size_t)aecbuflen;
 
    /* Encode into AEC. */
    ret = aec_buffer_encode(&strm);
    LOG((3, "enc_aec: return from aec_buffer_encode = %d", ret));
    if (ret == AEC_OK)
        ret = strm.total_out;
 
    return ret;
}