razf.c

   1 /*
   2  * RAZF : Random Access compressed(Z) File
   3  * Version: 1.0
   4  * Release Date: 2008-10-27
   5  *
   6  * Copyright 2008, Jue Ruan <ruanjue@gmail.com>, Heng Li <lh3@sanger.ac.uk>
   7  *
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  * To compile razf.c, zlib-1.2.3(or greater) is required.
  32  */
  33
  34 #ifndef _NO_RAZF
  35
  36 #include <fcntl.h>
  37 #include <stdio.h>
  38 #include <unistd.h>
  39 #include "razf.h"
  40
  41 static inline uint32_t byte_swap_4(uint32_t v){
  42         v = ((v & 0x0000FFFFU) << 16) | (v >> 16);
  43         return ((v & 0x00FF00FFU) << 8) | ((v & 0xFF00FF00U) >> 8);
  44 }
  45
  46 static inline uint64_t byte_swap_8(uint64_t v){
  47         v = ((v & 0x00000000FFFFFFFFLLU) << 32) | (v >> 32);
  48         v = ((v & 0x0000FFFF0000FFFFLLU) << 16) | ((v & 0xFFFF0000FFFF0000LLU) >> 16);
  49         return ((v & 0x00FF00FF00FF00FFLLU) << 8) | ((v & 0xFF00FF00FF00FF00LLU) >> 8);
  50 }
  51
  52 static inline int is_big_endian(){
  53         int x = 0x01;
  54         char *c = (char*)&x;
  55         return (c[0] != 0x01);
  56 }
  57
  58 static void add_zindex(RAZF *rz, int64_t in, int64_t out){
  59         if(rz->index->size == rz->index->cap){
  60                 rz->index->cap = rz->index->cap * 1.5 + 2;
  61                 rz->index->cell_offsets = realloc(rz->index->cell_offsets, sizeof(int) * rz->index->cap);
  62                 rz->index->bin_offsets  = realloc(rz->index->bin_offsets, sizeof(int64_t) * (rz->index->cap/RZ_BIN_SIZE + 1));
  63         }
  64         if(rz->index->size % RZ_BIN_SIZE == 0) rz->index->bin_offsets[rz->index->size / RZ_BIN_SIZE] = out;
  65         rz->index->cell_offsets[rz->index->size] = out - rz->index->bin_offsets[rz->index->size / RZ_BIN_SIZE];
  66         rz->index->size ++;
  67 }
  68
  69 static void save_zindex(RAZF *rz, int fd){
  70         int32_t i, v32;
  71         int is_be;
  72         is_be = is_big_endian();
  73         if(is_be) write(fd, &rz->index->size, sizeof(int));
  74         else {
  75                 v32 = byte_swap_4((uint32_t)rz->index->size);
  76                 write(fd, &v32, sizeof(uint32_t));
  77         }
  78         v32 = rz->index->size / RZ_BIN_SIZE + 1;
  79         if(!is_be){
  80                 for(i=0;i<v32;i++) rz->index->bin_offsets[i]  = byte_swap_8((uint64_t)rz->index->bin_offsets[i]);
  81                 for(i=0;i<rz->index->size;i++) rz->index->cell_offsets[i] = byte_swap_4((uint32_t)rz->index->cell_offsets[i]);
  82         }
  83         write(fd, rz->index->bin_offsets, sizeof(int64_t) * v32);
  84         write(fd, rz->index->cell_offsets, sizeof(int32_t) * rz->index->size);
  85 }
  86
  87 static void load_zindex(RAZF *rz, int fd){
  88         int32_t i, v32;
  89         int is_be;
  90         if(!rz->load_index) return;
  91         if(rz->index == NULL) rz->index = malloc(sizeof(ZBlockIndex));
  92         is_be = is_big_endian();
  93         read(fd, &rz->index->size, sizeof(int));
  94         if(!is_be) rz->index->size = byte_swap_4((uint32_t)rz->index->size);
  95         rz->index->cap = rz->index->size;
  96         v32 = rz->index->size / RZ_BIN_SIZE + 1;
  97         rz->index->bin_offsets  = malloc(sizeof(int64_t) * v32);
  98         read(fd, rz->index->bin_offsets, sizeof(int64_t) * v32);
  99         rz->index->cell_offsets = malloc(sizeof(int) * rz->index->size);
 100         read(fd, rz->index->cell_offsets, sizeof(int) * rz->index->size);
 101         if(!is_be){
 102                 for(i=0;i<v32;i++) rz->index->bin_offsets[i] = byte_swap_8((uint64_t)rz->index->bin_offsets[i]);
 103                 for(i=0;i<rz->index->size;i++) rz->index->cell_offsets[i] = byte_swap_4((uint32_t)rz->index->cell_offsets[i]);
 104         }
 105 }
 106
 107 static RAZF* razf_open_w(int fd){
 108         RAZF *rz;
 109         rz = calloc(1, sizeof(RAZF));
 110         rz->mode = 'w';
 111         rz->filedes = fd;
 112         rz->stream = calloc(sizeof(z_stream), 1);
 113         rz->inbuf  = malloc(RZ_BUFFER_SIZE);
 114         rz->outbuf = malloc(RZ_BUFFER_SIZE);
 115         rz->index = calloc(sizeof(ZBlockIndex), 1);
 116         deflateInit2(rz->stream, RZ_COMPRESS_LEVEL, Z_DEFLATED, WINDOW_BITS + 16, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
 117         rz->stream->avail_out = RZ_BUFFER_SIZE;
 118         rz->stream->next_out  = rz->outbuf;
 119         rz->header = calloc(sizeof(gz_header), 1);
 120         rz->header->os    = 0x03; //Unix
 121         rz->header->text  = 0;
 122         rz->header->time  = 0;
 123         rz->header->extra = malloc(7);
 124         strncpy((char*)rz->header->extra, "RAZF", 4);
 125         rz->header->extra[4] = 1; // obsolete field
 126         // block size = RZ_BLOCK_SIZE, Big-Endian
 127         rz->header->extra[5] = RZ_BLOCK_SIZE >> 8;
 128         rz->header->extra[6] = RZ_BLOCK_SIZE & 0xFF;
 129         rz->header->extra_len = 7;
 130         rz->header->name = rz->header->comment  = 0;
 131         rz->header->hcrc = 0;
 132         deflateSetHeader(rz->stream, rz->header);
 133         rz->block_pos = rz->block_off = 0;
 134         return rz;
 135 }
 136
 137 static void _razf_write(RAZF* rz, const void *data, int size){
 138         int tout;
 139         rz->stream->avail_in = size;
 140         rz->stream->next_in  = (void*)data;
 141         while(1){
 142                 tout = rz->stream->avail_out;
 143                 deflate(rz->stream, Z_NO_FLUSH);
 144                 rz->out += tout - rz->stream->avail_out;
 145                 if(rz->stream->avail_out) break;
 146                 write(rz->filedes, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
 147                 rz->stream->avail_out = RZ_BUFFER_SIZE;
 148                 rz->stream->next_out  = rz->outbuf;
 149                 if(rz->stream->avail_in == 0) break;
 150         };
 151         rz->in += size - rz->stream->avail_in;
 152         rz->block_off += size - rz->stream->avail_in;
 153 }
 154
 155 static void razf_flush(RAZF *rz){
 156         uint32_t tout;
 157         if(rz->buf_len){
 158                 _razf_write(rz, rz->inbuf, rz->buf_len);
 159                 rz->buf_off = rz->buf_len = 0;
 160         }
 161         if(rz->stream->avail_out){
 162                 write(rz->filedes, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
 163                 rz->stream->avail_out = RZ_BUFFER_SIZE;
 164                 rz->stream->next_out  = rz->outbuf;
 165         }
 166         while(1){
 167                 tout = rz->stream->avail_out;
 168                 deflate(rz->stream, Z_FULL_FLUSH);
 169                 rz->out += tout - rz->stream->avail_out;
 170                 if(rz->stream->avail_out == 0){
 171                         write(rz->filedes, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
 172                         rz->stream->avail_out = RZ_BUFFER_SIZE;
 173                         rz->stream->next_out  = rz->outbuf;
 174                 } else break;
 175         }
 176         rz->block_pos = rz->out;
 177         rz->block_off = 0;
 178 }
 179
 180 static void razf_end_flush(RAZF *rz){
 181         uint32_t tout;
 182         if(rz->buf_len){
 183                 _razf_write(rz, rz->inbuf, rz->buf_len);
 184                 rz->buf_off = rz->buf_len = 0;
 185         }
 186         while(1){
 187                 tout = rz->stream->avail_out;
 188                 deflate(rz->stream, Z_FINISH);
 189                 rz->out += tout - rz->stream->avail_out;
 190                 if(rz->stream->avail_out < RZ_BUFFER_SIZE){
 191                         write(rz->filedes, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
 192                         rz->stream->avail_out = RZ_BUFFER_SIZE;
 193                         rz->stream->next_out  = rz->outbuf;
 194                 } else break;
 195         }
 196 }
 197
 198 static void _razf_buffered_write(RAZF *rz, const void *data, int size){
 199         int i, n;
 200         while(1){
 201                 if(rz->buf_len == RZ_BUFFER_SIZE){
 202                         _razf_write(rz, rz->inbuf, rz->buf_len);
 203                         rz->buf_len = 0;
 204                 }
 205                 if(size + rz->buf_len < RZ_BUFFER_SIZE){
 206                         for(i=0;i<size;i++) ((char*)rz->inbuf + rz->buf_len)[i] = ((char*)data)[i];
 207                         rz->buf_len += size;
 208                         return;
 209                 } else {
 210                         n = RZ_BUFFER_SIZE - rz->buf_len;
 211                         for(i=0;i<n;i++) ((char*)rz->inbuf + rz->buf_len)[i] = ((char*)data)[i];
 212                         size -= n;
 213                         data += n;
 214                         rz->buf_len += n;
 215                 }
 216         }
 217 }
 218
 219 int razf_write(RAZF* rz, const void *data, int size){
 220         int ori_size, n;
 221         int64_t next_block;
 222         ori_size = size;
 223         next_block = ((rz->in / RZ_BLOCK_SIZE) + 1) * RZ_BLOCK_SIZE;
 224         while(rz->in + rz->buf_len + size >= next_block){
 225                 n = next_block - rz->in - rz->buf_len;
 226                 _razf_buffered_write(rz, data, n);
 227                 data += n;
 228                 size -= n;
 229                 razf_flush(rz);
 230                 add_zindex(rz, rz->in, rz->out);
 231                 next_block = ((rz->in / RZ_BLOCK_SIZE) + 1) * RZ_BLOCK_SIZE;
 232         }
 233         _razf_buffered_write(rz, data, size);
 234         return ori_size;
 235 }
 236
 237 /* gzip flag byte */
 238 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
 239 #define HEAD_CRC     0x02 /* bit 1 set: header CRC present */
 240 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
 241 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
 242 #define COMMENT      0x10 /* bit 4 set: file comment present */
 243 #define RESERVED     0xE0 /* bits 5..7: reserved */
 244
 245 static int _read_gz_header(unsigned char *data, int size, int *extra_off, int *extra_len){
 246         int method, flags, n, len;
 247         if(size < 2) return 0;
 248         if(data[0] != 0x1f || data[1] != 0x8b) return 0;
 249         if(size < 4) return 0;
 250         method = data[2];
 251         flags  = data[3];
 252         if(method != Z_DEFLATED || (flags & RESERVED)) return 0;
 253         n = 4 + 6; // Skip 6 bytes
 254         *extra_off = n + 2;
 255         *extra_len = 0;
 256         if(flags & EXTRA_FIELD){
 257                 if(size < n + 2) return 0;
 258                 len = ((int)data[n + 1] << 8) | data[n];
 259                 n += 2;
 260                 *extra_off = n;
 261                 while(len){
 262                         if(n >= size) return 0;
 263                         n ++;
 264                         len --;
 265                 }
 266                 *extra_len = n - (*extra_off);
 267         }
 268         if(flags & ORIG_NAME) while(n < size && data[n++]);
 269         if(flags & COMMENT) while(n < size && data[n++]);
 270         if(flags & HEAD_CRC){
 271                 if(n + 2 > size) return 0;
 272                 n += 2;
 273         }
 274         return n;
 275 }
 276
 277 static RAZF* razf_open_r(int fd, int _load_index){
 278         RAZF *rz;
 279         int ext_off, ext_len;
 280         int n, is_be, ret;
 281         int64_t end;
 282         unsigned char c[] = "RAZF";
 283         rz = calloc(1, sizeof(RAZF));
 284         rz->mode = 'r';
 285         rz->filedes = fd;
 286         rz->stream = calloc(sizeof(z_stream), 1);
 287         rz->inbuf  = malloc(RZ_BUFFER_SIZE);
 288         rz->outbuf = malloc(RZ_BUFFER_SIZE);
 289         rz->end = rz->src_end = 0x7FFFFFFFFFFFFFFFLL;
 290         n = read(rz->filedes, rz->inbuf, RZ_BUFFER_SIZE);
 291         ret = _read_gz_header(rz->inbuf, n, &ext_off, &ext_len);
 292         if(ret == 0){
 293                 PLAIN_FILE:
 294                 rz->in = n;
 295                 rz->file_type = FILE_TYPE_PLAIN;
 296                 memcpy(rz->outbuf, rz->inbuf, n);
 297                 rz->buf_len = n;
 298                 free(rz->stream);
 299                 rz->stream = NULL;
 300                 return rz;
 301         }
 302         rz->header_size = ret;
 303         ret = inflateInit2(rz->stream, -WINDOW_BITS);
 304         if(ret != Z_OK){ inflateEnd(rz->stream); goto PLAIN_FILE;}
 305         rz->stream->avail_in = n - rz->header_size;
 306         rz->stream->next_in  = rz->inbuf + rz->header_size;
 307         rz->stream->avail_out = RZ_BUFFER_SIZE;
 308         rz->stream->next_out  = rz->outbuf;
 309         rz->file_type = FILE_TYPE_GZ;
 310         rz->in = rz->header_size;
 311         rz->block_pos = rz->header_size;
 312         rz->next_block_pos = rz->header_size;
 313         rz->block_off = 0;
 314         if(ext_len < 7 || memcmp(rz->inbuf + ext_off, c, 4) != 0) return rz;
 315         if(((((unsigned char*)rz->inbuf)[ext_off + 5] << 8) | ((unsigned char*)rz->inbuf)[ext_off + 6]) != RZ_BLOCK_SIZE){
 316                 fprintf(stderr, " -- WARNING: RZ_BLOCK_SIZE is not %d, treat source as gz file.  in %s -- %s:%d --\n", RZ_BLOCK_SIZE, __FUNCTION__, __FILE__, __LINE__);
 317                 return rz;
 318         }
 319         rz->load_index = _load_index;
 320         rz->file_type = FILE_TYPE_RZ;
 321         if(lseek(fd, -16, SEEK_END) == -1){
 322                 UNSEEKABLE:
 323                 rz->seekable = 0;
 324                 rz->index = NULL;
 325                 rz->src_end = rz->end = 0x7FFFFFFFFFFFFFFFLL;
 326         } else {
 327                 is_be = is_big_endian();
 328                 rz->seekable = 1;
 329                 read(fd, &end, sizeof(int64_t));
 330                 if(!is_be) rz->src_end = (int64_t)byte_swap_8((uint64_t)end);
 331                 else rz->src_end = end;
 332                 read(fd, &end, sizeof(int64_t));
 333                 if(!is_be) rz->end = (int64_t)byte_swap_8((uint64_t)end);
 334                 else rz->end = end;
 335                 if(n > rz->end){
 336                         rz->stream->avail_in -= n - rz->end;
 337                         n = rz->end;
 338                 }
 339                 if(rz->end > rz->src_end){
 340                         lseek(fd, rz->in, SEEK_SET);
 341                         goto UNSEEKABLE;
 342                 }
 343                 if(lseek(fd, rz->end, SEEK_SET) != rz->end){
 344                         lseek(fd, rz->in, SEEK_SET);
 345                         goto UNSEEKABLE;
 346                 }
 347                 load_zindex(rz, fd);
 348                 lseek(fd, n, SEEK_SET);
 349         }
 350         return rz;
 351 }
 352
 353 RAZF* razf_dopen(int fd, const char *mode){
 354         if(strcasecmp(mode, "r") == 0) return razf_open_r(fd, 1);
 355         else if(strcasecmp(mode, "w") == 0) return razf_open_w(fd);
 356         else return NULL;
 357 }
 358
 359 RAZF* razf_dopen2(int fd, const char *mode)
 360 {
 361         if(strcasecmp(mode, "r") == 0) return razf_open_r(fd, 0);
 362         else if(strcasecmp(mode, "w") == 0) return razf_open_w(fd);
 363         else return NULL;
 364 }
 365
 366 static inline RAZF* _razf_open(const char *filename, const char *mode, int _load_index){
 367         int fd;
 368         RAZF *rz;
 369         if(strcasecmp(mode, "r") == 0){
 370                 fd = open(filename, O_RDONLY);
 371                 rz = razf_open_r(fd, _load_index);
 372         } else if(strcasecmp(mode, "w") == 0){
 373                 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 374                 rz = razf_open_w(fd);
 375         } else return NULL;
 376         return rz;
 377 }
 378
 379 RAZF* razf_open(const char *filename, const char *mode){
 380         return _razf_open(filename, mode, 1);
 381 }
 382
 383 RAZF* razf_open2(const char *filename, const char *mode){
 384         return _razf_open(filename, mode, 0);
 385 }
 386
 387 int razf_get_data_size(RAZF *rz, int64_t *u_size, int64_t *c_size){
 388         int64_t n;
 389         if(rz->mode != 'r' && rz->mode != 'R') return 0;
 390         switch(rz->file_type){
 391                 case FILE_TYPE_PLAIN:
 392                         if(rz->end == 0x7fffffffffffffffLL){
 393                                 if((n = lseek(rz->filedes, 0, SEEK_CUR)) == -1) return 0;
 394                                 rz->end = lseek(rz->filedes, 0, SEEK_END);
 395                                 lseek(rz->filedes, n, SEEK_SET);
 396                         }
 397                         *u_size = *c_size = rz->end;
 398                         return 1;
 399                 case FILE_TYPE_GZ:
 400                         return 0;
 401                 case FILE_TYPE_RZ:
 402                         if(rz->src_end == rz->end) return 0;
 403                         *u_size = rz->src_end;
 404                         *c_size = rz->end;
 405                         return 1;
 406                 default:
 407                         return 0;
 408         }
 409 }
 410
 411 static int _razf_read(RAZF* rz, void *data, int size){
 412         int ret, tin;
 413         if(rz->z_eof || rz->z_err) return 0;
 414         if (rz->file_type == FILE_TYPE_PLAIN) {
 415                 ret = read(rz->filedes, data, size);
 416                 if (ret == 0) rz->z_eof = 1;
 417                 return ret;
 418         }
 419         rz->stream->avail_out = size;
 420         rz->stream->next_out  = data;
 421         while(rz->stream->avail_out){
 422                 if(rz->stream->avail_in == 0){
 423                         if(rz->in >= rz->end){ rz->z_eof = 1; break; }
 424                         if(rz->end - rz->in < RZ_BUFFER_SIZE){
 425                                 rz->stream->avail_in = read(rz->filedes, rz->inbuf, rz->end -rz->in);
 426                         } else {
 427                                 rz->stream->avail_in = read(rz->filedes, rz->inbuf, RZ_BUFFER_SIZE);
 428                         }
 429                         if(rz->stream->avail_in == 0){
 430                                 rz->z_eof = 1;
 431                                 break;
 432                         }
 433                         rz->stream->next_in = rz->inbuf;
 434                 }
 435                 tin = rz->stream->avail_in;
 436                 ret = inflate(rz->stream, Z_BLOCK);
 437                 rz->in += tin - rz->stream->avail_in;
 438                 if(ret == Z_NEED_DICT || ret == Z_MEM_ERROR || ret == Z_DATA_ERROR){
 439                         fprintf(stderr, "[_razf_read] inflate error: %d (at %s:%d)\n", ret, __FILE__, __LINE__);
 440                         rz->z_err = 1;
 441                         break;
 442                 }
 443                 if(ret == Z_STREAM_END){
 444                         rz->z_eof = 1;
 445                         break;
 446                 }
 447                 if ((rz->stream->data_type&128) && !(rz->stream->data_type&64)){
 448                         rz->buf_flush = 1;
 449                         rz->next_block_pos = rz->in;
 450                         break;
 451                 }
 452         }
 453         return size - rz->stream->avail_out;
 454 }
 455
 456 int razf_read(RAZF *rz, void *data, int size){
 457         int ori_size, i;
 458         ori_size = size;
 459         while(size > 0){
 460                 if(rz->buf_len){
 461                         if(size < rz->buf_len){
 462                                 for(i=0;i<size;i++) ((char*)data)[i] = ((char*)rz->outbuf + rz->buf_off)[i];
 463                                 rz->buf_off += size;
 464                                 rz->buf_len -= size;
 465                                 data += size;
 466                                 rz->block_off += size;
 467                                 size = 0;
 468                                 break;
 469                         } else {
 470                                 for(i=0;i<rz->buf_len;i++) ((char*)data)[i] = ((char*)rz->outbuf + rz->buf_off)[i];
 471                                 data += rz->buf_len;
 472                                 size -= rz->buf_len;
 473                                 rz->block_off += rz->buf_len;
 474                                 rz->buf_off = 0;
 475                                 rz->buf_len = 0;
 476                                 if(rz->buf_flush){
 477                                         rz->block_pos = rz->next_block_pos;
 478                                         rz->block_off = 0;
 479                                         rz->buf_flush = 0;
 480                                 }
 481                         }
 482                 } else if(rz->buf_flush){
 483                         rz->block_pos = rz->next_block_pos;
 484                         rz->block_off = 0;
 485                         rz->buf_flush = 0;
 486                 }
 487                 if(rz->buf_flush) continue;
 488                 rz->buf_len = _razf_read(rz, rz->outbuf, RZ_BUFFER_SIZE);
 489                 if(rz->z_eof && rz->buf_len == 0) break;
 490         }
 491         rz->out += ori_size - size;
 492         return ori_size - size;
 493 }
 494
 495 int razf_skip(RAZF* rz, int size){
 496         int ori_size;
 497         ori_size = size;
 498         while(size > 0){
 499                 if(rz->buf_len){
 500                         if(size < rz->buf_len){
 501                                 rz->buf_off += size;
 502                                 rz->buf_len -= size;
 503                                 rz->block_off += size;
 504                                 size = 0;
 505                                 break;
 506                         } else {
 507                                 size -= rz->buf_len;
 508                                 rz->buf_off = 0;
 509                                 rz->buf_len = 0;
 510                                 rz->block_off += rz->buf_len;
 511                                 if(rz->buf_flush){
 512                                         rz->block_pos = rz->next_block_pos;
 513                                         rz->block_off = 0;
 514                                         rz->buf_flush = 0;
 515                                 }
 516                         }
 517                 } else if(rz->buf_flush){
 518                         rz->block_pos = rz->next_block_pos;
 519                         rz->block_off = 0;
 520                         rz->buf_flush = 0;
 521                 }
 522                 if(rz->buf_flush) continue;
 523                 rz->buf_len = _razf_read(rz, rz->outbuf, RZ_BUFFER_SIZE);
 524                 if(rz->z_eof) break;
 525         }
 526         rz->out += ori_size - size;
 527         return ori_size - size;
 528 }
 529
 530 static void _razf_reset_read(RAZF *rz, int64_t in, int64_t out){
 531         lseek(rz->filedes, in, SEEK_SET);
 532         rz->in  = in;
 533         rz->out = out;
 534         rz->block_pos = in;
 535         rz->next_block_pos = in;
 536         rz->block_off = 0;
 537         rz->buf_flush = 0;
 538         rz->z_eof = rz->z_err = 0;
 539         inflateReset(rz->stream);
 540         rz->stream->avail_in = 0;
 541         rz->buf_off = rz->buf_len = 0;
 542 }
 543
 544 int64_t razf_jump(RAZF *rz, int64_t block_start, int block_offset){
 545         int64_t pos;
 546         rz->z_eof = 0;
 547         if(rz->file_type == FILE_TYPE_PLAIN){
 548                 rz->buf_off = rz->buf_len = 0;
 549                 pos = block_start + block_offset;
 550                 pos = lseek(rz->filedes, pos, SEEK_SET);
 551                 rz->out = rz->in = pos;
 552                 return pos;
 553         }
 554         if(block_start == rz->block_pos && block_offset >= rz->block_off) {
 555                 block_offset -= rz->block_off;
 556                 goto SKIP; // Needn't reset inflate
 557         }
 558         if(block_start  == 0) block_start = rz->header_size; // Automaticly revist wrong block_start
 559         _razf_reset_read(rz, block_start, 0);
 560         SKIP:
 561         if(block_offset) razf_skip(rz, block_offset);
 562         return rz->block_off;
 563 }
 564
 565 int64_t razf_seek(RAZF* rz, int64_t pos, int where){
 566         int64_t idx;
 567         int64_t seek_pos, new_out;
 568         rz->z_eof = 0;
 569         if (where == SEEK_CUR) pos += rz->out;
 570         else if (where == SEEK_END) pos += rz->src_end;
 571         if(rz->file_type == FILE_TYPE_PLAIN){
 572                 seek_pos = lseek(rz->filedes, pos, SEEK_SET);
 573                 rz->buf_off = rz->buf_len = 0;
 574                 rz->out = rz->in = seek_pos;
 575                 return seek_pos;
 576         } else if(rz->file_type == FILE_TYPE_GZ){
 577                 if(pos >= rz->out) goto SKIP;
 578                 return rz->out;
 579         }
 580         if(pos == rz->out) return pos;
 581         if(pos > rz->src_end) return rz->out;
 582         if(!rz->seekable || !rz->load_index){
 583                 if(pos >= rz->out) goto SKIP;
 584         }
 585         idx = pos / RZ_BLOCK_SIZE - 1;
 586         seek_pos = (idx < 0)? rz->header_size:(rz->index->cell_offsets[idx] + rz->index->bin_offsets[idx / RZ_BIN_SIZE]);
 587         new_out  = (idx + 1) * RZ_BLOCK_SIZE;
 588         if(pos > rz->out && new_out <= rz->out) goto SKIP;
 589         _razf_reset_read(rz, seek_pos, new_out);
 590         SKIP:
 591         razf_skip(rz, (int)(pos - rz->out));
 592         return rz->out;
 593 }
 594
 595 uint64_t razf_tell2(RAZF *rz)
 596 {
 597         /*
 598         if (rz->load_index) {
 599                 int64_t idx, seek_pos;
 600                 idx = rz->out / RZ_BLOCK_SIZE - 1;
 601                 seek_pos = (idx < 0)? rz->header_size:(rz->index->cell_offsets[idx] + rz->index->bin_offsets[idx / RZ_BIN_SIZE]);
 602                 if (seek_pos != rz->block_pos || rz->out%RZ_BLOCK_SIZE != rz->block_off)
 603                         fprintf(stderr, "[razf_tell2] inconsistent block offset: (%lld, %lld) != (%lld, %lld)\n",
 604                                         (long long)seek_pos, (long long)rz->out%RZ_BLOCK_SIZE, (long long)rz->block_pos, (long long) rz->block_off);
 605         }
 606         */
 607         return (uint64_t)rz->block_pos<<16 | (rz->block_off&0xffff);
 608 }
 609
 610 int64_t razf_seek2(RAZF *rz, uint64_t voffset, int where)
 611 {
 612         if (where != SEEK_SET) return -1;
 613         return razf_jump(rz, voffset>>16, voffset&0xffff);
 614 }
 615
 616 void razf_close(RAZF *rz){
 617         uint64_t v64;
 618         if(rz->mode == 'w'){
 619                 razf_end_flush(rz);
 620                 deflateEnd(rz->stream);
 621                 save_zindex(rz, rz->filedes);
 622                 if(is_big_endian()){
 623                         write(rz->filedes, &rz->in, sizeof(int64_t));
 624                         write(rz->filedes, &rz->out, sizeof(int64_t));
 625                 } else {
 626                         v64 = byte_swap_8((uint64_t)rz->in);
 627                         write(rz->filedes, &v64, sizeof(int64_t));
 628                         v64 = byte_swap_8((uint64_t)rz->out);
 629                         write(rz->filedes, &v64, sizeof(int64_t));
 630                 }
 631         } else if(rz->mode == 'r'){
 632                 if(rz->stream) inflateEnd(rz->stream);
 633         }
 634         if(rz->inbuf) free(rz->inbuf);
 635         if(rz->outbuf) free(rz->outbuf);
 636         if(rz->header){
 637                 free(rz->header->extra);
 638                 free(rz->header->name);
 639                 free(rz->header->comment);
 640                 free(rz->header);
 641         }
 642         if(rz->index){
 643                 free(rz->index->bin_offsets);
 644                 free(rz->index->cell_offsets);
 645                 free(rz->index);
 646         }
 647         free(rz->stream);
 648         close(rz->filedes);
 649         free(rz);
 650 }
 651
 652 #endif