int ZEXPORT dread_file(FILE *input, zd_mem_buffer* buffer){
int nbread;
assert(input!=NULL);
assert(buffer!=NULL);
zd_alloc(buffer, ZD_BUF_SIZE);
for(;;){
/* read data */
nbread = fread((void *) buffer->pos,
sizeof(Byte), (size_t) ZD_BUF_SIZE, input);
buffer->pos=buffer->pos+nbread;
/* check for end of file */
if(feof(input)){
return (buffer->pos - buffer->buffer);
}
/* check for io error */
if(ferror(input)){
zd_free(buffer);
return ZD_ERRNO;
}
/* increase the buffer */
if(!zd_realloc(buffer, ZD_BUF_SIZE)){
zd_free(buffer);
/* not enough memory */
return ZD_MEM_ERROR;
}
}
}
size_t zd_memcpy(zd_mem_buffer *m, void *data, size_t n){
size_t avail=0;
avail = (m->size - (m->pos - m->buffer));
if(avail < n)
if(zd_realloc(m, (n-avail)+1)== 0)
return 0;
memcpy(m->pos, data, n);
m->pos += n;
return n;
}
/*
* same as above, but with dynamic memory allocation
*/
int ZEXPORT zd_compress1(const Bytef *ref, uLong rsize,
const Bytef *tar, uLong tsize,
Bytef **delta, uLongf *dsize)
{
int rval;
zd_stream strm;
zd_mem_buffer dbuf;
/* the zstream output buffer should have size greater than zero try to
* guess buffer size, such that no memory realocation will be needed
*/
if(!(*dsize)) *dsize = tsize/EXPECTED_RATIO + 64; /* *dsize should not be 0*/
/* init io buffers */
strm.base[0] = (Bytef*) ref;
strm.base_avail[0] = rsize;
strm.base_out[0] = 0;
strm.refnum = 1;
strm.next_in = (Bytef*) tar;
strm.total_in = 0;
strm.avail_in = tsize;
/* allocate the output buffer */
zd_alloc(&dbuf, *dsize);
strm.next_out = dbuf.pos;
strm.total_out = 0;
strm.avail_out = *dsize;
strm.zalloc = (alloc_func)0;
strm.zfree = (free_func)0;
strm.opaque = (voidpf)0;
/* init huffman coder */
rval = zd_deflateInit(&strm, 1 ); //ZD_DEFAULT_COMPRESSION);
if (rval != ZD_OK)
{
fprintf(stderr, "%s error: %d\n", "deflateInit", rval);
return rval;
}
/* compress the data */
while((rval = zd_deflate(&strm,ZD_FINISH)) == ZD_OK){
/* set correctly the mem_buffef internal pointer */
dbuf.pos = strm.next_out;
/* allocate more memory */
zd_realloc(&dbuf,dbuf.size);
/* restore zstream internal pointer */
strm.next_out = (uch*)dbuf.pos;
strm.avail_out = dbuf.size - strm.total_out;
}
/* set correcty the mem_buffer pointers */
dbuf.pos = strm.next_out;
if(rval != ZD_STREAM_END){
fprintf(stderr, "%s error: %d\n", "deflateInit", rval);
zd_free(&dbuf);
zd_deflateEnd(&strm);
return rval;
}
*delta = dbuf.buffer;
*dsize = (uLong) strm.total_out;
/* release memory */
return zd_deflateEnd(&strm);
}
/*
* same as above with dynamic memory allocation
*/
int ZEXPORT zd_uncompressN1(const Bytef *ref[], uLong rsize[], int rnum,
Bytef **tar, uLongf *tsize,
const Bytef *delta, uLong dsize)
{
int rval;
int f = ZD_SYNC_FLUSH;
int i;
zd_mem_buffer tbuf;
zd_stream strm;
/* zdelta: tsize must not be 0; try to guess a good output buffer size */
if(!(*tsize)) *tsize = rsize[0]*2+64;/* *tsize should not be 0*/
/* init io buffers */
strm.refnum = rnum;
/* init reference input buffers */
for(i = 0; i < rnum; ++i){
strm.base[i] = (Bytef*) ref[i];
strm.base_avail[i] = rsize[i];
strm.base_out[i] = 0;
}
/* allocate initial size delta buffer */
zd_alloc(&tbuf,*tsize);
strm.avail_out = *tsize;
strm.next_out = tbuf.buffer;
strm.total_out = 0;
strm.avail_in = dsize;
strm.next_in = (Bytef*) delta;
strm.total_in = 0;
strm.zalloc = (alloc_func)0;
strm.zfree = (free_func)0;
strm.opaque = (voidpf)0;
zd_inflateInit(&strm);
while((rval = zd_inflate(&strm,f)) == ZD_OK){
/* add more output memory */
if(strm.avail_out!=0){
rval = ZD_STREAM_END;
break;
}
/* set correctly the mem_buffer internal pointer */
tbuf.pos = strm.next_out;
/* allocate more memory */
zd_realloc(&tbuf,tbuf.size);
/* restore zstream internal pointer */
strm.next_out = tbuf.pos;
strm.avail_out = tbuf.size - strm.total_out;
}
/* set correctly the mem_buffer internal pointer */
tbuf.pos = strm.next_out;
if(rval != ZD_STREAM_END){
zd_free(&tbuf);
if(strm.msg!=NULL) fprintf(stderr,"%s\n",strm.msg);
zd_inflateEnd(&strm);
return rval;
}
*tar = tbuf.buffer;
*tsize = strm.total_out;
/* free memory */
return zd_inflateEnd(&strm);
}
