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