void lzma_test()
{
#if defined(__FreeBSD__) && !defined(__APPLE__)
_malloc_options = "XARV";
#endif
//char *fn = "/usr/share/dict/web2";
const char *fn = "/etc/motd";
printf("starting up\n");
FILE *f = fopen(fn,"r");
if(!f) err(1,"%s",fn);
struct stat st;
if(fstat(fileno(f),&st)) err(1,"stat");
/* Allocate memory */
size_t buflen = st.st_size;
printf("size=%qd\n",(long long)buflen);
unsigned char *buf = (unsigned char *)malloc(buflen);
if(buf==0) errx(1,"malloc");
if(fread(buf,1,st.st_size,f)!=(size_t)st.st_size) err(1,"read");
/* Allocate memory for the compressed buffer */
size_t cbufsize = (int)(buflen*1.05);
size_t cbuf_actual=0;
unsigned char *cbuf = (unsigned char *)malloc(cbufsize);
#ifdef USE_LZMA
lzma_compress(cbuf,&cbufsize,buf,st.st_size,9);
#endif
printf("cbuf_actual=%d\n",(int)cbuf_actual);
/* Now try to decompress */
size_t outbuf_size = buflen*2;
unsigned char *outbuf = (unsigned char *)malloc(outbuf_size);
#ifdef USE_LZMA
lzma_uncompress(outbuf,&outbuf_size,cbuf,cbufsize);
#endif
printf("cbuf[0]=%d\n",cbuf[0]);
if(memcmp(buf,outbuf,outbuf_size)==0){
printf("Decompression works!\n");
}
}
int af_get_page(AFFILE *af,int64_t pagenum,unsigned char *data,size_t *bytes)
{
unsigned long arg=0;
size_t page_len=0;
if (af_trace){
fprintf(af_trace,"af_get_page(%p,pagenum=%"I64d",buf=%p,bytes=%zu)\n",af,pagenum,data,*bytes);
}
/* Find out the size of the segment and if it is compressed or not.
* If we can't find it with new nomenclature, try the old one...
*/
int r = af_get_page_raw(af,pagenum,&arg,0,&page_len);
if(r){
/* Segment doesn't exist.
* If we have been provided with a buffer,
* fill buffer with the 'bad segment' flag and return.
*/
if (data && (af->openmode&AF_BADBLOCK_FILL)) {
for(size_t i = 0;i <= af->image_pagesize - af->image_sectorsize;
i+= af->image_sectorsize){
memcpy(data+i,af->badflag,af->image_sectorsize);
af->bytes_memcpy += af->image_sectorsize;
}
}
return r; // segment doesn't exist
}
/* If no data buffer was provided, just return */
if(data==0) return 0;
/* If the segment isn't compressed, just get it*/
unsigned long pageflag = 0;
if((arg & AF_PAGE_COMPRESSED)==0){
int ret = af_get_page_raw(af,pagenum,&pageflag,data,bytes);
if(*bytes > page_len) *bytes = page_len; // we only read this much
if(ret!=0) return ret; // some error happened?
}
else {
/* Allocate memory to hold the compressed segment */
unsigned char *compressed_data = (unsigned char *)malloc(page_len);
size_t compressed_data_len = page_len;
if(compressed_data==0){
return -2; // memory error
}
/* Get the data */
if(af_get_page_raw(af,pagenum,&pageflag,compressed_data,&compressed_data_len)){
free(compressed_data);
return -3; // read error
}
/* Now uncompress directly into the buffer provided by the caller. */
int res = -1; // 0 is success
switch((pageflag & AF_PAGE_COMP_ALG_MASK)){
case AF_PAGE_COMP_ALG_ZERO:
if(compressed_data_len != 4){
(*af->error_reporter)("ALG_ZERO compressed data is %d bytes, expected 4.",compressed_data_len);
break;
}
memset(data,0,af->image_pagesize);
*bytes = ntohl(*(long *)compressed_data);
res = 0; // not very hard to decompress with the ZERO compressor.
break;
case AF_PAGE_COMP_ALG_ZLIB:
res = uncompress(data,(uLongf *)bytes,compressed_data,compressed_data_len);
switch(res){
case Z_OK:
break;
case Z_ERRNO:
(*af->error_reporter)("Z_ERRNOR decompressing segment %"I64d,pagenum);
case Z_STREAM_ERROR:
(*af->error_reporter)("Z_STREAM_ERROR decompressing segment %"I64d,pagenum);
case Z_DATA_ERROR:
(*af->error_reporter)("Z_DATA_ERROR decompressing segment %"I64d,pagenum);
case Z_MEM_ERROR:
(*af->error_reporter)("Z_MEM_ERROR decompressing segment %"I64d,pagenum);
case Z_BUF_ERROR:
(*af->error_reporter)("Z_BUF_ERROR decompressing segment %"I64d,pagenum);
case Z_VERSION_ERROR:
(*af->error_reporter)("Z_VERSION_ERROR decompressing segment %"I64d,pagenum);
default:
(*af->error_reporter)("uncompress returned an invalid value in get_segment");
}
break;
#ifdef USE_LZMA
case AF_PAGE_COMP_ALG_LZMA:
res = lzma_uncompress(data,bytes,compressed_data,compressed_data_len);
if (af_trace) fprintf(af_trace," LZMA decompressed page %"I64d". %zd bytes => %zd bytes\n",
pagenum,compressed_data_len,*bytes);
switch(res){
case 0:break; // OK
case 1:(*af->error_reporter)("LZMA header error decompressing segment %"I64d"\n",pagenum);
break;
case 2:(*af->error_reporter)("LZMA memory error decompressing segment %"I64d"\n",pagenum);
break;
}
break;
#endif
default:
(*af->error_reporter)("Unknown compression algorithm 0x%d",
pageflag & AF_PAGE_COMP_ALG_MASK);
break;
}
free(compressed_data); // don't need this one anymore
af->pages_decompressed++;
if(res!=Z_OK) return -1;
}
/* If the page size is larger than the sector_size,
* make sure that the rest of the sector is zeroed, and that the
* rest after that has the 'bad block' notation.
*/
if(af->image_pagesize > af->image_sectorsize){
const int SECTOR_SIZE = af->image_sectorsize; // for ease of typing
size_t bytes_left_in_sector = (SECTOR_SIZE - (*bytes % SECTOR_SIZE)) % SECTOR_SIZE;
for(size_t i=0;i<bytes_left_in_sector;i++){
data[*bytes + i] = 0;
}
size_t end_of_data = *bytes + bytes_left_in_sector;
/* Now fill to the end of the page... */
for(size_t i = end_of_data; i <= af->image_pagesize-SECTOR_SIZE; i+=SECTOR_SIZE){
memcpy(data+i,af->badflag,SECTOR_SIZE);
af->bytes_memcpy += SECTOR_SIZE;
}
}
return 0;
}