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razf.c

/*
 * RAZF : Random Access compressed(Z) File
 * Version: 1.0
 * Release Date: 2008-10-27
 *
 * Copyright 2008, Jue Ruan <ruanjue@gmail.com>, Heng Li <lh3@sanger.ac.uk>
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef _NO_RAZF

#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "razf.h"


#if ZLIB_VERNUM < 0x1221
struct _gz_header_s {
    int     text;
    uLong   time;
    int     xflags;
    int     os;
    Bytef   *extra;
    uInt    extra_len;
    uInt    extra_max;
    Bytef   *name;
    uInt    name_max;
    Bytef   *comment;
    uInt    comm_max;
    int     hcrc;
    int     done;
};
#warning "zlib < 1.2.2.1; RAZF writing is disabled."
#endif

#define DEF_MEM_LEVEL 8

static inline uint32_t byte_swap_4(uint32_t v){
      v = ((v & 0x0000FFFFU) << 16) | (v >> 16);
      return ((v & 0x00FF00FFU) << 8) | ((v & 0xFF00FF00U) >> 8);
}

static inline uint64_t byte_swap_8(uint64_t v){
      v = ((v & 0x00000000FFFFFFFFLLU) << 32) | (v >> 32);
      v = ((v & 0x0000FFFF0000FFFFLLU) << 16) | ((v & 0xFFFF0000FFFF0000LLU) >> 16);
      return ((v & 0x00FF00FF00FF00FFLLU) << 8) | ((v & 0xFF00FF00FF00FF00LLU) >> 8);
}

static inline int is_big_endian(){
      int x = 0x01;
      char *c = (char*)&x;
      return (c[0] != 0x01);
}

#ifndef _RZ_READONLY
static void add_zindex(RAZF *rz, int64_t in, int64_t out){
      if(rz->index->size == rz->index->cap){
            rz->index->cap = rz->index->cap * 1.5 + 2;
            rz->index->cell_offsets = realloc(rz->index->cell_offsets, sizeof(int) * rz->index->cap);
            rz->index->bin_offsets  = realloc(rz->index->bin_offsets, sizeof(int64_t) * (rz->index->cap/RZ_BIN_SIZE + 1));
      }
      if(rz->index->size % RZ_BIN_SIZE == 0) rz->index->bin_offsets[rz->index->size / RZ_BIN_SIZE] = out;
      rz->index->cell_offsets[rz->index->size] = out - rz->index->bin_offsets[rz->index->size / RZ_BIN_SIZE];
      rz->index->size ++;
}

static void save_zindex(RAZF *rz, int fd){
      int32_t i, v32;
      int is_be;
      is_be = is_big_endian();
      if(is_be) write(fd, &rz->index->size, sizeof(int));
      else {
            v32 = byte_swap_4((uint32_t)rz->index->size);
            write(fd, &v32, sizeof(uint32_t));
      }
      v32 = rz->index->size / RZ_BIN_SIZE + 1;
      if(!is_be){
            for(i=0;i<v32;i++) rz->index->bin_offsets[i]  = byte_swap_8((uint64_t)rz->index->bin_offsets[i]);
            for(i=0;i<rz->index->size;i++) rz->index->cell_offsets[i] = byte_swap_4((uint32_t)rz->index->cell_offsets[i]);
      }
      write(fd, rz->index->bin_offsets, sizeof(int64_t) * v32);
      write(fd, rz->index->cell_offsets, sizeof(int32_t) * rz->index->size);
}
#endif

#ifdef _USE_KNETFILE
static void load_zindex(RAZF *rz, knetFile *fp){
#else
static void load_zindex(RAZF *rz, int fd){
#endif
      int32_t i, v32;
      int is_be;
      if(!rz->load_index) return;
      if(rz->index == NULL) rz->index = malloc(sizeof(ZBlockIndex));
      is_be = is_big_endian();
#ifdef _USE_KNETFILE
      knet_read(fp, &rz->index->size, sizeof(int));
#else
      read(fd, &rz->index->size, sizeof(int));
#endif
      if(!is_be) rz->index->size = byte_swap_4((uint32_t)rz->index->size);
      rz->index->cap = rz->index->size;
      v32 = rz->index->size / RZ_BIN_SIZE + 1;
      rz->index->bin_offsets  = malloc(sizeof(int64_t) * v32);
#ifdef _USE_KNETFILE
      knet_read(fp, rz->index->bin_offsets, sizeof(int64_t) * v32);
#else
      read(fd, rz->index->bin_offsets, sizeof(int64_t) * v32);
#endif
      rz->index->cell_offsets = malloc(sizeof(int) * rz->index->size);
#ifdef _USE_KNETFILE
      knet_read(fp, rz->index->cell_offsets, sizeof(int) * rz->index->size);
#else
      read(fd, rz->index->cell_offsets, sizeof(int) * rz->index->size);
#endif
      if(!is_be){
            for(i=0;i<v32;i++) rz->index->bin_offsets[i] = byte_swap_8((uint64_t)rz->index->bin_offsets[i]);
            for(i=0;i<rz->index->size;i++) rz->index->cell_offsets[i] = byte_swap_4((uint32_t)rz->index->cell_offsets[i]);
      }
}

#ifdef _RZ_READONLY
static RAZF* razf_open_w(int fd)
{
      fprintf(stderr, "[razf_open_w] Writing is not available with zlib ver < 1.2.2.1\n");
      return 0;
}
#else
static RAZF* razf_open_w(int fd){
      RAZF *rz;
#ifdef _WIN32
      setmode(fd, O_BINARY);
#endif
      rz = calloc(1, sizeof(RAZF));
      rz->mode = 'w';
#ifdef _USE_KNETFILE
    rz->x.fpw = fd;
#else
      rz->filedes = fd;
#endif
      rz->stream = calloc(sizeof(z_stream), 1);
      rz->inbuf  = malloc(RZ_BUFFER_SIZE);
      rz->outbuf = malloc(RZ_BUFFER_SIZE);
      rz->index = calloc(sizeof(ZBlockIndex), 1);
      deflateInit2(rz->stream, RZ_COMPRESS_LEVEL, Z_DEFLATED, WINDOW_BITS + 16, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
      rz->stream->avail_out = RZ_BUFFER_SIZE;
      rz->stream->next_out  = rz->outbuf;
      rz->header = calloc(sizeof(gz_header), 1);
      rz->header->os    = 0x03; //Unix
      rz->header->text  = 0;
      rz->header->time  = 0;
      rz->header->extra = malloc(7);
      strncpy((char*)rz->header->extra, "RAZF", 4);
      rz->header->extra[4] = 1; // obsolete field
      // block size = RZ_BLOCK_SIZE, Big-Endian
      rz->header->extra[5] = RZ_BLOCK_SIZE >> 8;
      rz->header->extra[6] = RZ_BLOCK_SIZE & 0xFF;
      rz->header->extra_len = 7;
      rz->header->name = rz->header->comment  = 0;
      rz->header->hcrc = 0;
      deflateSetHeader(rz->stream, rz->header);
      rz->block_pos = rz->block_off = 0;
      return rz;
}

static void _razf_write(RAZF* rz, const void *data, int size){
      int tout;
      rz->stream->avail_in = size;
      rz->stream->next_in  = (void*)data;
      while(1){
            tout = rz->stream->avail_out;
            deflate(rz->stream, Z_NO_FLUSH);
            rz->out += tout - rz->stream->avail_out;
            if(rz->stream->avail_out) break;
#ifdef _USE_KNETFILE
            write(rz->x.fpw, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
#else
            write(rz->filedes, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
#endif
            rz->stream->avail_out = RZ_BUFFER_SIZE;
            rz->stream->next_out  = rz->outbuf;
            if(rz->stream->avail_in == 0) break;
      };
      rz->in += size - rz->stream->avail_in;
      rz->block_off += size - rz->stream->avail_in;
}

static void razf_flush(RAZF *rz){
      uint32_t tout;
      if(rz->buf_len){
            _razf_write(rz, rz->inbuf, rz->buf_len);
            rz->buf_off = rz->buf_len = 0;
      }
      if(rz->stream->avail_out){
#ifdef _USE_KNETFILE    
            write(rz->x.fpw, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
#else        
            write(rz->filedes, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
#endif
            rz->stream->avail_out = RZ_BUFFER_SIZE;
            rz->stream->next_out  = rz->outbuf;
      }
      while(1){
            tout = rz->stream->avail_out;
            deflate(rz->stream, Z_FULL_FLUSH);
            rz->out += tout - rz->stream->avail_out;
            if(rz->stream->avail_out == 0){
#ifdef _USE_KNETFILE    
                  write(rz->x.fpw, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
#else            
                  write(rz->filedes, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
#endif
                  rz->stream->avail_out = RZ_BUFFER_SIZE;
                  rz->stream->next_out  = rz->outbuf;
            } else break;
      }
      rz->block_pos = rz->out;
      rz->block_off = 0;
}

static void razf_end_flush(RAZF *rz){
      uint32_t tout;
      if(rz->buf_len){
            _razf_write(rz, rz->inbuf, rz->buf_len);
            rz->buf_off = rz->buf_len = 0;
      }
      while(1){
            tout = rz->stream->avail_out;
            deflate(rz->stream, Z_FINISH);
            rz->out += tout - rz->stream->avail_out;
            if(rz->stream->avail_out < RZ_BUFFER_SIZE){
#ifdef _USE_KNETFILE        
                  write(rz->x.fpw, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
#else            
                  write(rz->filedes, rz->outbuf, RZ_BUFFER_SIZE - rz->stream->avail_out);
#endif
                  rz->stream->avail_out = RZ_BUFFER_SIZE;
                  rz->stream->next_out  = rz->outbuf;
            } else break;
      }
}

static void _razf_buffered_write(RAZF *rz, const void *data, int size){
      int i, n;
      while(1){
            if(rz->buf_len == RZ_BUFFER_SIZE){
                  _razf_write(rz, rz->inbuf, rz->buf_len);
                  rz->buf_len = 0;
            }
            if(size + rz->buf_len < RZ_BUFFER_SIZE){
                  for(i=0;i<size;i++) ((char*)rz->inbuf + rz->buf_len)[i] = ((char*)data)[i];
                  rz->buf_len += size;
                  return;
            } else {
                  n = RZ_BUFFER_SIZE - rz->buf_len;
                  for(i=0;i<n;i++) ((char*)rz->inbuf + rz->buf_len)[i] = ((char*)data)[i];
                  size -= n;
                  data += n;
                  rz->buf_len += n;
            }
      }
}

int razf_write(RAZF* rz, const void *data, int size){
      int ori_size, n;
      int64_t next_block;
      ori_size = size;
      next_block = ((rz->in / RZ_BLOCK_SIZE) + 1) * RZ_BLOCK_SIZE;
      while(rz->in + rz->buf_len + size >= next_block){
            n = next_block - rz->in - rz->buf_len;
            _razf_buffered_write(rz, data, n);
            data += n;
            size -= n;
            razf_flush(rz);
            add_zindex(rz, rz->in, rz->out);
            next_block = ((rz->in / RZ_BLOCK_SIZE) + 1) * RZ_BLOCK_SIZE;
      }
      _razf_buffered_write(rz, data, size);
      return ori_size;
}
#endif

/* gzip flag byte */
#define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
#define HEAD_CRC     0x02 /* bit 1 set: header CRC present */
#define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
#define ORIG_NAME    0x08 /* bit 3 set: original file name present */
#define COMMENT      0x10 /* bit 4 set: file comment present */
#define RESERVED     0xE0 /* bits 5..7: reserved */

static int _read_gz_header(unsigned char *data, int size, int *extra_off, int *extra_len){
      int method, flags, n, len;
      if(size < 2) return 0;
      if(data[0] != 0x1f || data[1] != 0x8b) return 0;
      if(size < 4) return 0;
      method = data[2];
      flags  = data[3];
      if(method != Z_DEFLATED || (flags & RESERVED)) return 0;
      n = 4 + 6; // Skip 6 bytes
      *extra_off = n + 2;
      *extra_len = 0;
      if(flags & EXTRA_FIELD){
            if(size < n + 2) return 0;
            len = ((int)data[n + 1] << 8) | data[n];
            n += 2;
            *extra_off = n;
            while(len){
                  if(n >= size) return 0;
                  n ++;
                  len --;
            }
            *extra_len = n - (*extra_off);
      }
      if(flags & ORIG_NAME) while(n < size && data[n++]);
      if(flags & COMMENT) while(n < size && data[n++]);
      if(flags & HEAD_CRC){
            if(n + 2 > size) return 0;
            n += 2;
      }
      return n;
}

#ifdef _USE_KNETFILE
static RAZF* razf_open_r(knetFile *fp, int _load_index){
#else
static RAZF* razf_open_r(int fd, int _load_index){
#endif
      RAZF *rz;
      int ext_off, ext_len;
      int n, is_be, ret;
      int64_t end;
      unsigned char c[] = "RAZF";
      rz = calloc(1, sizeof(RAZF));
      rz->mode = 'r';
#ifdef _USE_KNETFILE
    rz->x.fpr = fp;
#else
#ifdef _WIN32
      setmode(fd, O_BINARY);
#endif
      rz->filedes = fd;
#endif
      rz->stream = calloc(sizeof(z_stream), 1);
      rz->inbuf  = malloc(RZ_BUFFER_SIZE);
      rz->outbuf = malloc(RZ_BUFFER_SIZE);
      rz->end = rz->src_end = 0x7FFFFFFFFFFFFFFFLL;
#ifdef _USE_KNETFILE
    n = knet_read(rz->x.fpr, rz->inbuf, RZ_BUFFER_SIZE);
#else
      n = read(rz->filedes, rz->inbuf, RZ_BUFFER_SIZE);
#endif
      ret = _read_gz_header(rz->inbuf, n, &ext_off, &ext_len);
      if(ret == 0){
            PLAIN_FILE:
            rz->in = n;
            rz->file_type = FILE_TYPE_PLAIN;
            memcpy(rz->outbuf, rz->inbuf, n);
            rz->buf_len = n;
            free(rz->stream);
            rz->stream = NULL;
            return rz;
      }
      rz->header_size = ret;
      ret = inflateInit2(rz->stream, -WINDOW_BITS);
      if(ret != Z_OK){ inflateEnd(rz->stream); goto PLAIN_FILE;}
      rz->stream->avail_in = n - rz->header_size;
      rz->stream->next_in  = rz->inbuf + rz->header_size;
      rz->stream->avail_out = RZ_BUFFER_SIZE;
      rz->stream->next_out  = rz->outbuf;
      rz->file_type = FILE_TYPE_GZ;
      rz->in = rz->header_size;
      rz->block_pos = rz->header_size;
      rz->next_block_pos = rz->header_size;
      rz->block_off = 0;
      if(ext_len < 7 || memcmp(rz->inbuf + ext_off, c, 4) != 0) return rz;
      if(((((unsigned char*)rz->inbuf)[ext_off + 5] << 8) | ((unsigned char*)rz->inbuf)[ext_off + 6]) != RZ_BLOCK_SIZE){
            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__);
            return rz;
      }
      rz->load_index = _load_index;
      rz->file_type = FILE_TYPE_RZ;
#ifdef _USE_KNETFILE
      if(knet_seek(fp, -16, SEEK_END) == -1){
#else
      if(lseek(fd, -16, SEEK_END) == -1){
#endif
            UNSEEKABLE:
            rz->seekable = 0;
            rz->index = NULL;
            rz->src_end = rz->end = 0x7FFFFFFFFFFFFFFFLL;
      } else {
            is_be = is_big_endian();
            rz->seekable = 1;
#ifdef _USE_KNETFILE
        knet_read(fp, &end, sizeof(int64_t));
#else
            read(fd, &end, sizeof(int64_t));
#endif        
            if(!is_be) rz->src_end = (int64_t)byte_swap_8((uint64_t)end);
            else rz->src_end = end;

#ifdef _USE_KNETFILE
            knet_read(fp, &end, sizeof(int64_t));
#else
            read(fd, &end, sizeof(int64_t));
#endif        
            if(!is_be) rz->end = (int64_t)byte_swap_8((uint64_t)end);
            else rz->end = end;
            if(n > rz->end){
                  rz->stream->avail_in -= n - rz->end;
                  n = rz->end;
            }
            if(rz->end > rz->src_end){
#ifdef _USE_KNETFILE
            knet_seek(fp, rz->in, SEEK_SET);
#else
                  lseek(fd, rz->in, SEEK_SET);
#endif
                  goto UNSEEKABLE;
            }
#ifdef _USE_KNETFILE
        knet_seek(fp, rz->end, SEEK_SET);
            if(knet_tell(fp) != rz->end){
                  knet_seek(fp, rz->in, SEEK_SET);
#else
            if(lseek(fd, rz->end, SEEK_SET) != rz->end){
                  lseek(fd, rz->in, SEEK_SET);
#endif
                  goto UNSEEKABLE;
            }
#ifdef _USE_KNETFILE
            load_zindex(rz, fp);
            knet_seek(fp, n, SEEK_SET);
#else
            load_zindex(rz, fd);
            lseek(fd, n, SEEK_SET);
#endif
      }
      return rz;
}

#ifdef _USE_KNETFILE
RAZF* razf_dopen(int fd, const char *mode){
    if (strstr(mode, "r")) fprintf(stderr,"[razf_dopen] implement me\n");
    else if(strstr(mode, "w")) return razf_open_w(fd);
      return NULL;
}

RAZF* razf_dopen2(int fd, const char *mode)
{
    fprintf(stderr,"[razf_dopen2] implement me\n");
    return NULL;
}
#else
RAZF* razf_dopen(int fd, const char *mode){
      if(strstr(mode, "r")) return razf_open_r(fd, 1);
      else if(strstr(mode, "w")) return razf_open_w(fd);
      else return NULL;
}

RAZF* razf_dopen2(int fd, const char *mode)
{
      if(strstr(mode, "r")) return razf_open_r(fd, 0);
      else if(strstr(mode, "w")) return razf_open_w(fd);
      else return NULL;
}
#endif

static inline RAZF* _razf_open(const char *filename, const char *mode, int _load_index){
      int fd;
      RAZF *rz;
      if(strstr(mode, "r")){
#ifdef _USE_KNETFILE
        knetFile *fd = knet_open(filename, "r");
        if (fd == 0) {
            fprintf(stderr, "[_razf_open] fail to open %s\n", filename);
            return NULL;
        }
#else
#ifdef _WIN32
            fd = open(filename, O_RDONLY | O_BINARY);
#else
            fd = open(filename, O_RDONLY);
#endif
#endif
            if(fd < 0) return NULL;
            rz = razf_open_r(fd, _load_index);
      } else if(strstr(mode, "w")){
#ifdef _WIN32
            fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0666);
#else
            fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
#endif
            if(fd < 0) return NULL;
            rz = razf_open_w(fd);
      } else return NULL;
      return rz;
}

RAZF* razf_open(const char *filename, const char *mode){
      return _razf_open(filename, mode, 1);
}

RAZF* razf_open2(const char *filename, const char *mode){
      return _razf_open(filename, mode, 0);
}

int razf_get_data_size(RAZF *rz, int64_t *u_size, int64_t *c_size){
      int64_t n;
      if(rz->mode != 'r' && rz->mode != 'R') return 0;
      switch(rz->file_type){
            case FILE_TYPE_PLAIN:
                  if(rz->end == 0x7fffffffffffffffLL){
#ifdef _USE_KNETFILE
                        if(knet_seek(rz->x.fpr, 0, SEEK_CUR) == -1) return 0;
                n = knet_tell(rz->x.fpr);
                        knet_seek(rz->x.fpr, 0, SEEK_END);
                rz->end = knet_tell(rz->x.fpr);
                        knet_seek(rz->x.fpr, n, SEEK_SET);
#else
                        if((n = lseek(rz->filedes, 0, SEEK_CUR)) == -1) return 0;
                        rz->end = lseek(rz->filedes, 0, SEEK_END);
                        lseek(rz->filedes, n, SEEK_SET);
#endif                
                  }
                  *u_size = *c_size = rz->end;
                  return 1;
            case FILE_TYPE_GZ:
                  return 0;
            case FILE_TYPE_RZ:
                  if(rz->src_end == rz->end) return 0;
                  *u_size = rz->src_end;
                  *c_size = rz->end;
                  return 1;
            default:
                  return 0;
      }
}

static int _razf_read(RAZF* rz, void *data, int size){
      int ret, tin;
      if(rz->z_eof || rz->z_err) return 0;
      if (rz->file_type == FILE_TYPE_PLAIN) {
#ifdef _USE_KNETFILE
            ret = knet_read(rz->x.fpr, data, size);
#else
            ret = read(rz->filedes, data, size);
#endif        
            if (ret == 0) rz->z_eof = 1;
            return ret;
      }
      rz->stream->avail_out = size;
      rz->stream->next_out  = data;
      while(rz->stream->avail_out){
            if(rz->stream->avail_in == 0){
                  if(rz->in >= rz->end){ rz->z_eof = 1; break; }
                  if(rz->end - rz->in < RZ_BUFFER_SIZE){
#ifdef _USE_KNETFILE
                        rz->stream->avail_in = knet_read(rz->x.fpr, rz->inbuf, rz->end -rz->in);
#else
                        rz->stream->avail_in = read(rz->filedes, rz->inbuf, rz->end -rz->in);
#endif        
                  } else {
#ifdef _USE_KNETFILE
                        rz->stream->avail_in = knet_read(rz->x.fpr, rz->inbuf, RZ_BUFFER_SIZE);
#else
                        rz->stream->avail_in = read(rz->filedes, rz->inbuf, RZ_BUFFER_SIZE);
#endif        
                  }
                  if(rz->stream->avail_in == 0){
                        rz->z_eof = 1;
                        break;
                  }
                  rz->stream->next_in = rz->inbuf;
            }
            tin = rz->stream->avail_in;
            ret = inflate(rz->stream, Z_BLOCK);
            rz->in += tin - rz->stream->avail_in;
            if(ret == Z_NEED_DICT || ret == Z_MEM_ERROR || ret == Z_DATA_ERROR){
                  fprintf(stderr, "[_razf_read] inflate error: %d %s (at %s:%d)\n", ret, rz->stream->msg ? rz->stream->msg : "", __FILE__, __LINE__);
                  rz->z_err = 1;
                  break;
            }
            if(ret == Z_STREAM_END){
                  rz->z_eof = 1;
                  break;
            }
            if ((rz->stream->data_type&128) && !(rz->stream->data_type&64)){
                  rz->buf_flush = 1;
                  rz->next_block_pos = rz->in;
                  break;
            }
      }
      return size - rz->stream->avail_out;
}

int razf_read(RAZF *rz, void *data, int size){
      int ori_size, i;
      ori_size = size;
      while(size > 0){
            if(rz->buf_len){
                  if(size < rz->buf_len){
                        for(i=0;i<size;i++) ((char*)data)[i] = ((char*)rz->outbuf + rz->buf_off)[i];
                        rz->buf_off += size;
                        rz->buf_len -= size;
                        data += size;
                        rz->block_off += size;
                        size = 0;
                        break;
                  } else {
                        for(i=0;i<rz->buf_len;i++) ((char*)data)[i] = ((char*)rz->outbuf + rz->buf_off)[i];
                        data += rz->buf_len;
                        size -= rz->buf_len;
                        rz->block_off += rz->buf_len;
                        rz->buf_off = 0;
                        rz->buf_len = 0;
                        if(rz->buf_flush){
                              rz->block_pos = rz->next_block_pos;
                              rz->block_off = 0;
                              rz->buf_flush = 0;
                        }
                  }
            } else if(rz->buf_flush){
                  rz->block_pos = rz->next_block_pos;
                  rz->block_off = 0;
                  rz->buf_flush = 0;
            }
            if(rz->buf_flush) continue;
            rz->buf_len = _razf_read(rz, rz->outbuf, RZ_BUFFER_SIZE);
            if(rz->z_eof && rz->buf_len == 0) break;
      }
      rz->out += ori_size - size;
      return ori_size - size;
}

int razf_skip(RAZF* rz, int size){
      int ori_size;
      ori_size = size;
      while(size > 0){
            if(rz->buf_len){
                  if(size < rz->buf_len){
                        rz->buf_off += size;
                        rz->buf_len -= size;
                        rz->block_off += size;
                        size = 0;
                        break;
                  } else {
                        size -= rz->buf_len;
                        rz->buf_off = 0;
                        rz->buf_len = 0;
                        rz->block_off += rz->buf_len;
                        if(rz->buf_flush){
                              rz->block_pos = rz->next_block_pos;
                              rz->block_off = 0;
                              rz->buf_flush = 0;
                        }
                  }
            } else if(rz->buf_flush){
                  rz->block_pos = rz->next_block_pos;
                  rz->block_off = 0;
                  rz->buf_flush = 0;
            }
            if(rz->buf_flush) continue;
            rz->buf_len = _razf_read(rz, rz->outbuf, RZ_BUFFER_SIZE);
            if(rz->z_eof || rz->z_err) break;
      }
      rz->out += ori_size - size;
      return ori_size - size;
}

static void _razf_reset_read(RAZF *rz, int64_t in, int64_t out){
#ifdef _USE_KNETFILE
      knet_seek(rz->x.fpr, in, SEEK_SET);
#else
      lseek(rz->filedes, in, SEEK_SET);
#endif
      rz->in  = in;
      rz->out = out;
      rz->block_pos = in;
      rz->next_block_pos = in;
      rz->block_off = 0;
      rz->buf_flush = 0;
      rz->z_eof = rz->z_err = 0;
      inflateReset(rz->stream);
      rz->stream->avail_in = 0;
      rz->buf_off = rz->buf_len = 0;
}

int64_t razf_jump(RAZF *rz, int64_t block_start, int block_offset){
      int64_t pos;
      rz->z_eof = 0;
      if(rz->file_type == FILE_TYPE_PLAIN){
            rz->buf_off = rz->buf_len = 0;
            pos = block_start + block_offset;
#ifdef _USE_KNETFILE
            knet_seek(rz->x.fpr, pos, SEEK_SET);
        pos = knet_tell(rz->x.fpr);
#else
            pos = lseek(rz->filedes, pos, SEEK_SET);
#endif
            rz->out = rz->in = pos;
            return pos;
      }
      if(block_start == rz->block_pos && block_offset >= rz->block_off) {
            block_offset -= rz->block_off;
            goto SKIP; // Needn't reset inflate
      }
      if(block_start  == 0) block_start = rz->header_size; // Automaticly revist wrong block_start
      _razf_reset_read(rz, block_start, 0);
      SKIP:
      if(block_offset) razf_skip(rz, block_offset);
      return rz->block_off;
}

int64_t razf_seek(RAZF* rz, int64_t pos, int where){
      int64_t idx;
      int64_t seek_pos, new_out;
      rz->z_eof = 0;
      if (where == SEEK_CUR) pos += rz->out;
      else if (where == SEEK_END) pos += rz->src_end;
      if(rz->file_type == FILE_TYPE_PLAIN){
#ifdef _USE_KNETFILE
            knet_seek(rz->x.fpr, pos, SEEK_SET);
        seek_pos = knet_tell(rz->x.fpr);
#else
            seek_pos = lseek(rz->filedes, pos, SEEK_SET);
#endif
            rz->buf_off = rz->buf_len = 0;
            rz->out = rz->in = seek_pos;
            return seek_pos;
      } else if(rz->file_type == FILE_TYPE_GZ){
            if(pos >= rz->out) goto SKIP;
            return rz->out;
      }
      if(pos == rz->out) return pos;
      if(pos > rz->src_end) return rz->out;
      if(!rz->seekable || !rz->load_index){
            if(pos >= rz->out) goto SKIP;
      }
      idx = pos / RZ_BLOCK_SIZE - 1;
      seek_pos = (idx < 0)? rz->header_size:(rz->index->cell_offsets[idx] + rz->index->bin_offsets[idx / RZ_BIN_SIZE]);
      new_out  = (idx + 1) * RZ_BLOCK_SIZE;
      if(pos > rz->out && new_out <= rz->out) goto SKIP;
      _razf_reset_read(rz, seek_pos, new_out);
      SKIP:
      razf_skip(rz, (int)(pos - rz->out));
      return rz->out;
}

uint64_t razf_tell2(RAZF *rz)
{
      /*
      if (rz->load_index) {
            int64_t idx, seek_pos;
            idx = rz->out / RZ_BLOCK_SIZE - 1;
            seek_pos = (idx < 0)? rz->header_size:(rz->index->cell_offsets[idx] + rz->index->bin_offsets[idx / RZ_BIN_SIZE]);
            if (seek_pos != rz->block_pos || rz->out%RZ_BLOCK_SIZE != rz->block_off)
                  fprintf(stderr, "[razf_tell2] inconsistent block offset: (%lld, %lld) != (%lld, %lld)\n",
                              (long long)seek_pos, (long long)rz->out%RZ_BLOCK_SIZE, (long long)rz->block_pos, (long long) rz->block_off);
      }
      */
      return (uint64_t)rz->block_pos<<16 | (rz->block_off&0xffff);
}

int64_t razf_seek2(RAZF *rz, uint64_t voffset, int where)
{
      if (where != SEEK_SET) return -1;
      return razf_jump(rz, voffset>>16, voffset&0xffff);
}

void razf_close(RAZF *rz){
      if(rz->mode == 'w'){
#ifndef _RZ_READONLY
            razf_end_flush(rz);
            deflateEnd(rz->stream);
#ifdef _USE_KNETFILE
            save_zindex(rz, rz->x.fpw);
            if(is_big_endian()){
                  write(rz->x.fpw, &rz->in, sizeof(int64_t));
                  write(rz->x.fpw, &rz->out, sizeof(int64_t));
            } else {
                  uint64_t v64 = byte_swap_8((uint64_t)rz->in);
                  write(rz->x.fpw, &v64, sizeof(int64_t));
                  v64 = byte_swap_8((uint64_t)rz->out);
                  write(rz->x.fpw, &v64, sizeof(int64_t));
            }
#else
            save_zindex(rz, rz->filedes);
            if(is_big_endian()){
                  write(rz->filedes, &rz->in, sizeof(int64_t));
                  write(rz->filedes, &rz->out, sizeof(int64_t));
            } else {
                  uint64_t v64 = byte_swap_8((uint64_t)rz->in);
                  write(rz->filedes, &v64, sizeof(int64_t));
                  v64 = byte_swap_8((uint64_t)rz->out);
                  write(rz->filedes, &v64, sizeof(int64_t));
            }
#endif
#endif
      } else if(rz->mode == 'r'){
            if(rz->stream) inflateEnd(rz->stream);
      }
      if(rz->inbuf) free(rz->inbuf);
      if(rz->outbuf) free(rz->outbuf);
      if(rz->header){
            free(rz->header->extra);
            free(rz->header->name);
            free(rz->header->comment);
            free(rz->header);
      }
      if(rz->index){
            free(rz->index->bin_offsets);
            free(rz->index->cell_offsets);
            free(rz->index);
      }
      free(rz->stream);
#ifdef _USE_KNETFILE
    if (rz->mode == 'r')
        knet_close(rz->x.fpr);
    if (rz->mode == 'w')
        close(rz->x.fpw);
#else
      close(rz->filedes);
#endif
      free(rz);
}

#endif

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