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 <stdlib.h>
  39 #include <string.h>
  40 #include <unistd.h>
  41 #include "razf.h"
  42
  43 #if ZLIB_VERNUM < 0x1221
  44 struct _gz_header_s {
  45     int     text;
  46     uLong   time;
  47     int     xflags;
  48     int     os;
  49     Bytef   *extra;
  50     uInt    extra_len;
  51     uInt    extra_max;
  52     Bytef   *name;
  53     uInt    name_max;
  54     Bytef   *comment;
  55     uInt    comm_max;
  56     int     hcrc;
  57     int     done;
  58 };
  59 #endif
  60
  61 #define DEF_MEM_LEVEL 8
  62
  63 static inline uint32_t byte_swap_4(uint32_t v){
  64         v = ((v & 0x0000FFFFU) << 16) | (v >> 16);
  65         return ((v & 0x00FF00FFU) << 8) | ((v & 0xFF00FF00U) >> 8);
  66 }
  67
  68 static inline uint64_t byte_swap_8(uint64_t v){
  69         v = ((v & 0x00000000FFFFFFFFLLU) << 32) | (v >> 32);
  70         v = ((v & 0x0000FFFF0000FFFFLLU) << 16) | ((v & 0xFFFF0000FFFF0000LLU) >> 16);
  71         return ((v & 0x00FF00FF00FF00FFLLU) << 8) | ((v & 0xFF00FF00FF00FF00LLU) >> 8);
  72 }
  73
  74 static inline int is_big_endian(){
  75         int x = 0x01;
  76         char *c = (char*)&x;
  77         return (c[0] != 0x01);
  78 }
  79
  80 #ifndef _RZ_READONLY
  81 static void add_zindex(RAZF *rz, int64_t in, int64_t out){
  82         if(rz->index->size == rz->index->cap){
  83                 rz->index->cap = rz->index->cap * 1.5 + 2;
  84                 rz->index->cell_offsets = realloc(rz->index->cell_offsets, sizeof(int) * rz->index->cap);
  85                 rz->index->bin_offsets  = realloc(rz->index->bin_offsets, sizeof(int64_t) * (rz->index->cap/RZ_BIN_SIZE + 1));
  86         }
  87         if(rz->index->size % RZ_BIN_SIZE == 0) rz->index->bin_offsets[rz->index->size / RZ_BIN_SIZE] = out;
  88         rz->index->cell_offsets[rz->index->size] = out - rz->index->bin_offsets[rz->index->size / RZ_BIN_SIZE];
  89         rz->index->size ++;
  90 }
  91
  92 static void save_zindex(RAZF *rz, int fd){
  93         int32_t i, v32;
  94         int is_be;
  95         is_be = is_big_endian();
  96         if(is_be) write(fd, &rz->index->size, sizeof(int));
  97         else {
  98                 v32 = byte_swap_4((uint32_t)rz->index->size);
  99                 write(fd, &v32, sizeof(uint32_t));
 100         }
 101         v32 = rz->index->size / RZ_BIN_SIZE + 1;
 102         if(!is_be){
 103                 for(i=0;i<v32;i++) rz->index->bin_offsets[i]  = byte_swap_8((uint64_t)rz->index->bin_offsets[i]);
 104                 for(i=0;i<rz->index->size;i++) rz->index->cell_offsets[i] = byte_swap_4((uint32_t)rz->index->cell_offsets[i]);
 105         }
 106         write(fd, rz->index->bin_offsets, sizeof(int64_t) * v32);
 107         write(fd, rz->index->cell_offsets, sizeof(int32_t) * rz->index->size);
 108 }
 109 #endif
 110
 111 static void load_zindex(RAZF *rz, int fd){
 112         int32_t i, v32;
 113         int is_be;
 114         if(!rz->load_index) return;
 115         if(rz->index == NULL) rz->index = malloc(sizeof(ZBlockIndex));
 116         is_be = is_big_endian();
 117         read(fd, &rz->index->size, sizeof(int));
 118         if(!is_be) rz->index->size = byte_swap_4((uint32_t)rz->index->size);
 119         rz->index->cap = rz->index->size;
 120         v32 = rz->index->size / RZ_BIN_SIZE + 1;
 121         rz->index->bin_offsets  = malloc(sizeof(int64_t) * v32);
 122         read(fd, rz->index->bin_offsets, sizeof(int64_t) * v32);
 123         rz->index->cell_offsets = malloc(sizeof(int) * rz->index->size);
 124         read(fd, rz->index->cell_offsets, sizeof(int) * rz->index->size);
 125         if(!is_be){
 126                 for(i=0;i<v32;i++) rz->index->bin_offsets[i] = byte_swap_8((uint64_t)rz->index->bin_offsets[i]);
 127                 for(i=0;i<rz->index->size;i++) rz->index->cell_offsets[i] = byte_swap_4((uint32_t)rz->index->cell_offsets[i]);
 128         }
 129 }
 130
 131 #ifdef _RZ_READONLY
 132 static RAZF* razf_open_w(int fd)
 133 {
 134         fprintf(stderr, "[razf_open_w] Writing is not available with zlib ver < 1.2.2.1\n");
 135         return 0;
 136 }
 137 #else
 138 static RAZF* razf_open_w(int fd){
 139         RAZF *rz;
 140         rz = calloc(1, sizeof(RAZF));
 141         rz->mode = 'w';
 142         rz->filedes = fd;
 143         rz->stream = calloc(sizeof(z_stream), 1);
 144         rz->inbuf  = malloc(RZ_BUFFER_SIZE);
 145         rz->outbuf = malloc(RZ_BUFFER_SIZE);
 146         rz->index = calloc(sizeof(ZBlockIndex), 1);
 147         deflateInit2(rz->stream, RZ_COMPRESS_LEVEL, Z_DEFLATED, WINDOW_BITS + 16, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
 148         rz->stream->avail_out = RZ_BUFFER_SIZE;
 149         rz->stream->next_out  = rz->outbuf;
 150         rz->header = calloc(sizeof(gz_header), 1);
 151         rz->header->os    = 0x03; //Unix
 152         rz->header->text  = 0;
 153         rz->header->time  = 0;
 154         rz->header->extra = malloc(7);
 155         strncpy((char*)rz->header->extra, "RAZF", 4);
 156         rz->header->extra[4] = 1; // obsolete field
 157         // block size = RZ_BLOCK_SIZE, Big-Endian
 158         rz->header->extra[5] = RZ_BLOCK_SIZE >> 8;
 159         rz->header->extra[6] = RZ_BLOCK_SIZE & 0xFF;
 160         rz->header->extra_len = 7;
 161         rz->header->name = rz->header->comment  = 0;
 162         rz->header->hcrc = 0;
 163         deflateSetHeader(rz->stream, rz->header);
 164         rz->block_pos = rz->block_off = 0;
 165         return rz;
 166 }
 167
 168 static void _razf_write(RAZF* rz, const void *data, int size){
 169         int tout;
 170         rz->stream->avail_in = size;
 171         rz->stream->next_in  = (void*)data;
 172         while(1){
 173                 tout = rz->stream->avail_out;
 174                 deflate(rz->stream, Z_NO_FLUSH);
 175                 rz->out += tout - rz->stream->avail_out;
 176                 if(rz->stream->avail_out) break;
 177                 write(rz->filedes, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
 178                 rz->stream->avail_out = RZ_BUFFER_SIZE;
 179                 rz->stream->next_out  = rz->outbuf;
 180                 if(rz->stream->avail_in == 0) break;
 181         };
 182         rz->in += size - rz->stream->avail_in;
 183         rz->block_off += size - rz->stream->avail_in;
 184 }
 185
 186 static void razf_flush(RAZF *rz){
 187         uint32_t tout;
 188         if(rz->buf_len){
 189                 _razf_write(rz, rz->inbuf, rz->buf_len);
 190                 rz->buf_off = rz->buf_len = 0;
 191         }
 192         if(rz->stream->avail_out){
 193                 write(rz->filedes, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
 194                 rz->stream->avail_out = RZ_BUFFER_SIZE;
 195                 rz->stream->next_out  = rz->outbuf;
 196         }
 197         while(1){
 198                 tout = rz->stream->avail_out;
 199                 deflate(rz->stream, Z_FULL_FLUSH);
 200                 rz->out += tout - rz->stream->avail_out;
 201                 if(rz->stream->avail_out == 0){
 202                         write(rz->filedes, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
 203                         rz->stream->avail_out = RZ_BUFFER_SIZE;
 204                         rz->stream->next_out  = rz->outbuf;
 205                 } else break;
 206         }
 207         rz->block_pos = rz->out;
 208         rz->block_off = 0;
 209 }
 210
 211 static void razf_end_flush(RAZF *rz){
 212         uint32_t tout;
 213         if(rz->buf_len){
 214                 _razf_write(rz, rz->inbuf, rz->buf_len);
 215                 rz->buf_off = rz->buf_len = 0;
 216         }
 217         while(1){
 218                 tout = rz->stream->avail_out;
 219                 deflate(rz->stream, Z_FINISH);
 220                 rz->out += tout - rz->stream->avail_out;
 221                 if(rz->stream->avail_out < RZ_BUFFER_SIZE){
 222                         write(rz->filedes, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
 223                         rz->stream->avail_out = RZ_BUFFER_SIZE;
 224                         rz->stream->next_out  = rz->outbuf;
 225                 } else break;
 226         }
 227 }
 228
 229 static void _razf_buffered_write(RAZF *rz, const void *data, int size){
 230         int i, n;
 231         while(1){
 232                 if(rz->buf_len == RZ_BUFFER_SIZE){
 233                         _razf_write(rz, rz->inbuf, rz->buf_len);
 234                         rz->buf_len = 0;
 235                 }
 236                 if(size + rz->buf_len < RZ_BUFFER_SIZE){
 237                         for(i=0;i<size;i++) ((char*)rz->inbuf + rz->buf_len)[i] = ((char*)data)[i];
 238                         rz->buf_len += size;
 239                         return;
 240                 } else {
 241                         n = RZ_BUFFER_SIZE - rz->buf_len;
 242                         for(i=0;i<n;i++) ((char*)rz->inbuf + rz->buf_len)[i] = ((char*)data)[i];
 243                         size -= n;
 244                         data += n;
 245                         rz->buf_len += n;
 246                 }
 247         }
 248 }
 249
 250 int razf_write(RAZF* rz, const void *data, int size){
 251         int ori_size, n;
 252         int64_t next_block;
 253         ori_size = size;
 254         next_block = ((rz->in / RZ_BLOCK_SIZE) + 1) * RZ_BLOCK_SIZE;
 255         while(rz->in + rz->buf_len + size >= next_block){
 256                 n = next_block - rz->in - rz->buf_len;
 257                 _razf_buffered_write(rz, data, n);
 258                 data += n;
 259                 size -= n;
 260                 razf_flush(rz);
 261                 add_zindex(rz, rz->in, rz->out);
 262                 next_block = ((rz->in / RZ_BLOCK_SIZE) + 1) * RZ_BLOCK_SIZE;
 263         }
 264         _razf_buffered_write(rz, data, size);
 265         return ori_size;
 266 }
 267 #endif
 268
 269 /* gzip flag byte */
 270 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
 271 #define HEAD_CRC     0x02 /* bit 1 set: header CRC present */
 272 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
 273 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
 274 #define COMMENT      0x10 /* bit 4 set: file comment present */
 275 #define RESERVED     0xE0 /* bits 5..7: reserved */
 276
 277 static int _read_gz_header(unsigned char *data, int size, int *extra_off, int *extra_len){
 278         int method, flags, n, len;
 279         if(size < 2) return 0;
 280         if(data[0] != 0x1f || data[1] != 0x8b) return 0;
 281         if(size < 4) return 0;
 282         method = data[2];
 283         flags  = data[3];
 284         if(method != Z_DEFLATED || (flags & RESERVED)) return 0;
 285         n = 4 + 6; // Skip 6 bytes
 286         *extra_off = n + 2;
 287         *extra_len = 0;
 288         if(flags & EXTRA_FIELD){
 289                 if(size < n + 2) return 0;
 290                 len = ((int)data[n + 1] << 8) | data[n];
 291                 n += 2;
 292                 *extra_off = n;
 293                 while(len){
 294                         if(n >= size) return 0;
 295                         n ++;
 296                         len --;
 297                 }
 298                 *extra_len = n - (*extra_off);
 299         }
 300         if(flags & ORIG_NAME) while(n < size && data[n++]);
 301         if(flags & COMMENT) while(n < size && data[n++]);
 302         if(flags & HEAD_CRC){
 303                 if(n + 2 > size) return 0;
 304                 n += 2;
 305         }
 306         return n;
 307 }
 308
 309 static RAZF* razf_open_r(int fd, int _load_index){
 310         RAZF *rz;
 311         int ext_off, ext_len;
 312         int n, is_be, ret;
 313         int64_t end;
 314         unsigned char c[] = "RAZF";
 315         rz = calloc(1, sizeof(RAZF));
 316         rz->mode = 'r';
 317         rz->filedes = fd;
 318         rz->stream = calloc(sizeof(z_stream), 1);
 319         rz->inbuf  = malloc(RZ_BUFFER_SIZE);
 320         rz->outbuf = malloc(RZ_BUFFER_SIZE);
 321         rz->end = rz->src_end = 0x7FFFFFFFFFFFFFFFLL;
 322         n = read(rz->filedes, rz->inbuf, RZ_BUFFER_SIZE);
 323         ret = _read_gz_header(rz->inbuf, n, &ext_off, &ext_len);
 324         if(ret == 0){
 325                 PLAIN_FILE:
 326                 rz->in = n;
 327                 rz->file_type = FILE_TYPE_PLAIN;
 328                 memcpy(rz->outbuf, rz->inbuf, n);
 329                 rz->buf_len = n;
 330                 free(rz->stream);
 331                 rz->stream = NULL;
 332                 return rz;
 333         }
 334         rz->header_size = ret;
 335         ret = inflateInit2(rz->stream, -WINDOW_BITS);
 336         if(ret != Z_OK){ inflateEnd(rz->stream); goto PLAIN_FILE;}
 337         rz->stream->avail_in = n - rz->header_size;
 338         rz->stream->next_in  = rz->inbuf + rz->header_size;
 339         rz->stream->avail_out = RZ_BUFFER_SIZE;
 340         rz->stream->next_out  = rz->outbuf;
 341         rz->file_type = FILE_TYPE_GZ;
 342         rz->in = rz->header_size;
 343         rz->block_pos = rz->header_size;
 344         rz->next_block_pos = rz->header_size;
 345         rz->block_off = 0;
 346         if(ext_len < 7 || memcmp(rz->inbuf + ext_off, c, 4) != 0) return rz;
 347         if(((((unsigned char*)rz->inbuf)[ext_off + 5] << 8) | ((unsigned char*)rz->inbuf)[ext_off + 6]) != RZ_BLOCK_SIZE){
 348                 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__);
 349                 return rz;
 350         }
 351         rz->load_index = _load_index;
 352         rz->file_type = FILE_TYPE_RZ;
 353         if(lseek(fd, -16, SEEK_END) == -1){
 354                 UNSEEKABLE:
 355                 rz->seekable = 0;
 356                 rz->index = NULL;
 357                 rz->src_end = rz->end = 0x7FFFFFFFFFFFFFFFLL;
 358         } else {
 359                 is_be = is_big_endian();
 360                 rz->seekable = 1;
 361                 read(fd, &end, sizeof(int64_t));
 362                 if(!is_be) rz->src_end = (int64_t)byte_swap_8((uint64_t)end);
 363                 else rz->src_end = end;
 364                 read(fd, &end, sizeof(int64_t));
 365                 if(!is_be) rz->end = (int64_t)byte_swap_8((uint64_t)end);
 366                 else rz->end = end;
 367                 if(n > rz->end){
 368                         rz->stream->avail_in -= n - rz->end;
 369                         n = rz->end;
 370                 }
 371                 if(rz->end > rz->src_end){
 372                         lseek(fd, rz->in, SEEK_SET);
 373                         goto UNSEEKABLE;
 374                 }
 375                 if(lseek(fd, rz->end, SEEK_SET) != rz->end){
 376                         lseek(fd, rz->in, SEEK_SET);
 377                         goto UNSEEKABLE;
 378                 }
 379                 load_zindex(rz, fd);
 380                 lseek(fd, n, SEEK_SET);
 381         }
 382         return rz;
 383 }
 384
 385 RAZF* razf_dopen(int fd, const char *mode){
 386         if(strcasecmp(mode, "r") == 0) return razf_open_r(fd, 1);
 387         else if(strcasecmp(mode, "w") == 0) return razf_open_w(fd);
 388         else return NULL;
 389 }
 390
 391 RAZF* razf_dopen2(int fd, const char *mode)
 392 {
 393         if(strcasecmp(mode, "r") == 0) return razf_open_r(fd, 0);
 394         else if(strcasecmp(mode, "w") == 0) return razf_open_w(fd);
 395         else return NULL;
 396 }
 397
 398 static inline RAZF* _razf_open(const char *filename, const char *mode, int _load_index){
 399         int fd;
 400         RAZF *rz;
 401         if(strcasecmp(mode, "r") == 0){
 402                 fd = open(filename, O_RDONLY);
 403                 rz = razf_open_r(fd, _load_index);
 404         } else if(strcasecmp(mode, "w") == 0){
 405                 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 406                 rz = razf_open_w(fd);
 407         } else return NULL;
 408         return rz;
 409 }
 410
 411 RAZF* razf_open(const char *filename, const char *mode){
 412         return _razf_open(filename, mode, 1);
 413 }
 414
 415 RAZF* razf_open2(const char *filename, const char *mode){
 416         return _razf_open(filename, mode, 0);
 417 }
 418
 419 int razf_get_data_size(RAZF *rz, int64_t *u_size, int64_t *c_size){
 420         int64_t n;
 421         if(rz->mode != 'r' && rz->mode != 'R') return 0;
 422         switch(rz->file_type){
 423                 case FILE_TYPE_PLAIN:
 424                         if(rz->end == 0x7fffffffffffffffLL){
 425                                 if((n = lseek(rz->filedes, 0, SEEK_CUR)) == -1) return 0;
 426                                 rz->end = lseek(rz->filedes, 0, SEEK_END);
 427                                 lseek(rz->filedes, n, SEEK_SET);
 428                         }
 429                         *u_size = *c_size = rz->end;
 430                         return 1;
 431                 case FILE_TYPE_GZ:
 432                         return 0;
 433                 case FILE_TYPE_RZ:
 434                         if(rz->src_end == rz->end) return 0;
 435                         *u_size = rz->src_end;
 436                         *c_size = rz->end;
 437                         return 1;
 438                 default:
 439                         return 0;
 440         }
 441 }
 442
 443 static int _razf_read(RAZF* rz, void *data, int size){
 444         int ret, tin;
 445         if(rz->z_eof || rz->z_err) return 0;
 446         if (rz->file_type == FILE_TYPE_PLAIN) {
 447                 ret = read(rz->filedes, data, size);
 448                 if (ret == 0) rz->z_eof = 1;
 449                 return ret;
 450         }
 451         rz->stream->avail_out = size;
 452         rz->stream->next_out  = data;
 453         while(rz->stream->avail_out){
 454                 if(rz->stream->avail_in == 0){
 455                         if(rz->in >= rz->end){ rz->z_eof = 1; break; }
 456                         if(rz->end - rz->in < RZ_BUFFER_SIZE){
 457                                 rz->stream->avail_in = read(rz->filedes, rz->inbuf, rz->end -rz->in);
 458                         } else {
 459                                 rz->stream->avail_in = read(rz->filedes, rz->inbuf, RZ_BUFFER_SIZE);
 460                         }
 461                         if(rz->stream->avail_in == 0){
 462                                 rz->z_eof = 1;
 463                                 break;
 464                         }
 465                         rz->stream->next_in = rz->inbuf;
 466                 }
 467                 tin = rz->stream->avail_in;
 468                 ret = inflate(rz->stream, Z_BLOCK);
 469                 rz->in += tin - rz->stream->avail_in;
 470                 if(ret == Z_NEED_DICT || ret == Z_MEM_ERROR || ret == Z_DATA_ERROR){
 471                         fprintf(stderr, "[_razf_read] inflate error: %d (at %s:%d)\n", ret, __FILE__, __LINE__);
 472                         rz->z_err = 1;
 473                         break;
 474                 }
 475                 if(ret == Z_STREAM_END){
 476                         rz->z_eof = 1;
 477                         break;
 478                 }
 479                 if ((rz->stream->data_type&128) && !(rz->stream->data_type&64)){
 480                         rz->buf_flush = 1;
 481                         rz->next_block_pos = rz->in;
 482                         break;
 483                 }
 484         }
 485         return size - rz->stream->avail_out;
 486 }
 487
 488 int razf_read(RAZF *rz, void *data, int size){
 489         int ori_size, i;
 490         ori_size = size;
 491         while(size > 0){
 492                 if(rz->buf_len){
 493                         if(size < rz->buf_len){
 494                                 for(i=0;i<size;i++) ((char*)data)[i] = ((char*)rz->outbuf + rz->buf_off)[i];
 495                                 rz->buf_off += size;
 496                                 rz->buf_len -= size;
 497                                 data += size;
 498                                 rz->block_off += size;
 499                                 size = 0;
 500                                 break;
 501                         } else {
 502                                 for(i=0;i<rz->buf_len;i++) ((char*)data)[i] = ((char*)rz->outbuf + rz->buf_off)[i];
 503                                 data += rz->buf_len;
 504                                 size -= rz->buf_len;
 505                                 rz->block_off += rz->buf_len;
 506                                 rz->buf_off = 0;
 507                                 rz->buf_len = 0;
 508                                 if(rz->buf_flush){
 509                                         rz->block_pos = rz->next_block_pos;
 510                                         rz->block_off = 0;
 511                                         rz->buf_flush = 0;
 512                                 }
 513                         }
 514                 } else if(rz->buf_flush){
 515                         rz->block_pos = rz->next_block_pos;
 516                         rz->block_off = 0;
 517                         rz->buf_flush = 0;
 518                 }
 519                 if(rz->buf_flush) continue;
 520                 rz->buf_len = _razf_read(rz, rz->outbuf, RZ_BUFFER_SIZE);
 521                 if(rz->z_eof && rz->buf_len == 0) break;
 522         }
 523         rz->out += ori_size - size;
 524         return ori_size - size;
 525 }
 526
 527 int razf_skip(RAZF* rz, int size){
 528         int ori_size;
 529         ori_size = size;
 530         while(size > 0){
 531                 if(rz->buf_len){
 532                         if(size < rz->buf_len){
 533                                 rz->buf_off += size;
 534                                 rz->buf_len -= size;
 535                                 rz->block_off += size;
 536                                 size = 0;
 537                                 break;
 538                         } else {
 539                                 size -= rz->buf_len;
 540                                 rz->buf_off = 0;
 541                                 rz->buf_len = 0;
 542                                 rz->block_off += rz->buf_len;
 543                                 if(rz->buf_flush){
 544                                         rz->block_pos = rz->next_block_pos;
 545                                         rz->block_off = 0;
 546                                         rz->buf_flush = 0;
 547                                 }
 548                         }
 549                 } else if(rz->buf_flush){
 550                         rz->block_pos = rz->next_block_pos;
 551                         rz->block_off = 0;
 552                         rz->buf_flush = 0;
 553                 }
 554                 if(rz->buf_flush) continue;
 555                 rz->buf_len = _razf_read(rz, rz->outbuf, RZ_BUFFER_SIZE);
 556                 if(rz->z_eof) break;
 557         }
 558         rz->out += ori_size - size;
 559         return ori_size - size;
 560 }
 561
 562 static void _razf_reset_read(RAZF *rz, int64_t in, int64_t out){
 563         lseek(rz->filedes, in, SEEK_SET);
 564         rz->in  = in;
 565         rz->out = out;
 566         rz->block_pos = in;
 567         rz->next_block_pos = in;
 568         rz->block_off = 0;
 569         rz->buf_flush = 0;
 570         rz->z_eof = rz->z_err = 0;
 571         inflateReset(rz->stream);
 572         rz->stream->avail_in = 0;
 573         rz->buf_off = rz->buf_len = 0;
 574 }
 575
 576 int64_t razf_jump(RAZF *rz, int64_t block_start, int block_offset){
 577         int64_t pos;
 578         rz->z_eof = 0;
 579         if(rz->file_type == FILE_TYPE_PLAIN){
 580                 rz->buf_off = rz->buf_len = 0;
 581                 pos = block_start + block_offset;
 582                 pos = lseek(rz->filedes, pos, SEEK_SET);
 583                 rz->out = rz->in = pos;
 584                 return pos;
 585         }
 586         if(block_start == rz->block_pos && block_offset >= rz->block_off) {
 587                 block_offset -= rz->block_off;
 588                 goto SKIP; // Needn't reset inflate
 589         }
 590         if(block_start  == 0) block_start = rz->header_size; // Automaticly revist wrong block_start
 591         _razf_reset_read(rz, block_start, 0);
 592         SKIP:
 593         if(block_offset) razf_skip(rz, block_offset);
 594         return rz->block_off;
 595 }
 596
 597 int64_t razf_seek(RAZF* rz, int64_t pos, int where){
 598         int64_t idx;
 599         int64_t seek_pos, new_out;
 600         rz->z_eof = 0;
 601         if (where == SEEK_CUR) pos += rz->out;
 602         else if (where == SEEK_END) pos += rz->src_end;
 603         if(rz->file_type == FILE_TYPE_PLAIN){
 604                 seek_pos = lseek(rz->filedes, pos, SEEK_SET);
 605                 rz->buf_off = rz->buf_len = 0;
 606                 rz->out = rz->in = seek_pos;
 607                 return seek_pos;
 608         } else if(rz->file_type == FILE_TYPE_GZ){
 609                 if(pos >= rz->out) goto SKIP;
 610                 return rz->out;
 611         }
 612         if(pos == rz->out) return pos;
 613         if(pos > rz->src_end) return rz->out;
 614         if(!rz->seekable || !rz->load_index){
 615                 if(pos >= rz->out) goto SKIP;
 616         }
 617         idx = pos / RZ_BLOCK_SIZE - 1;
 618         seek_pos = (idx < 0)? rz->header_size:(rz->index->cell_offsets[idx] + rz->index->bin_offsets[idx / RZ_BIN_SIZE]);
 619         new_out  = (idx + 1) * RZ_BLOCK_SIZE;
 620         if(pos > rz->out && new_out <= rz->out) goto SKIP;
 621         _razf_reset_read(rz, seek_pos, new_out);
 622         SKIP:
 623         razf_skip(rz, (int)(pos - rz->out));
 624         return rz->out;
 625 }
 626
 627 uint64_t razf_tell2(RAZF *rz)
 628 {
 629         /*
 630         if (rz->load_index) {
 631                 int64_t idx, seek_pos;
 632                 idx = rz->out / RZ_BLOCK_SIZE - 1;
 633                 seek_pos = (idx < 0)? rz->header_size:(rz->index->cell_offsets[idx] + rz->index->bin_offsets[idx / RZ_BIN_SIZE]);
 634                 if (seek_pos != rz->block_pos || rz->out%RZ_BLOCK_SIZE != rz->block_off)
 635                         fprintf(stderr, "[razf_tell2] inconsistent block offset: (%lld, %lld) != (%lld, %lld)\n",
 636                                         (long long)seek_pos, (long long)rz->out%RZ_BLOCK_SIZE, (long long)rz->block_pos, (long long) rz->block_off);
 637         }
 638         */
 639         return (uint64_t)rz->block_pos<<16 | (rz->block_off&0xffff);
 640 }
 641
 642 int64_t razf_seek2(RAZF *rz, uint64_t voffset, int where)
 643 {
 644         if (where != SEEK_SET) return -1;
 645         return razf_jump(rz, voffset>>16, voffset&0xffff);
 646 }
 647
 648 void razf_close(RAZF *rz){
 649         if(rz->mode == 'w'){
 650 #ifndef _RZ_READONLY
 651                 razf_end_flush(rz);
 652                 deflateEnd(rz->stream);
 653                 save_zindex(rz, rz->filedes);
 654                 if(is_big_endian()){
 655                         write(rz->filedes, &rz->in, sizeof(int64_t));
 656                         write(rz->filedes, &rz->out, sizeof(int64_t));
 657                 } else {
 658                         uint64_t v64 = byte_swap_8((uint64_t)rz->in);
 659                         write(rz->filedes, &v64, sizeof(int64_t));
 660                         v64 = byte_swap_8((uint64_t)rz->out);
 661                         write(rz->filedes, &v64, sizeof(int64_t));
 662                 }
 663 #endif
 664         } else if(rz->mode == 'r'){
 665                 if(rz->stream) inflateEnd(rz->stream);
 666         }
 667         if(rz->inbuf) free(rz->inbuf);
 668         if(rz->outbuf) free(rz->outbuf);
 669         if(rz->header){
 670                 free(rz->header->extra);
 671                 free(rz->header->name);
 672                 free(rz->header->comment);
 673                 free(rz->header);
 674         }
 675         if(rz->index){
 676                 free(rz->index->bin_offsets);
 677                 free(rz->index->cell_offsets);
 678                 free(rz->index);
 679         }
 680         free(rz->stream);
 681         close(rz->filedes);
 682         free(rz);
 683 }
 684
 685 #endif