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/*
* zsync - client side rsync over http
* Copyright (C) 2004,2005,2007,2009 Colin Phipps <cph@moria.org.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the Artistic License v2 (see the accompanying
* file COPYING for the full license terms), or, at your option, any later
* version of the same license.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* COPYING file for details.
*/
#include "zsglobal.h"
struct gzblock {
uint16_t inbitoffset;
uint16_t outbyteoffset;
} __attribute__((packed));
#define GZB_NOTBLOCKSTART 0x8000
struct zmap;
struct z_stream_s;
struct zmap* zmap_make(const struct gzblock* zb, int n);
void zmap_free(struct zmap*);
off_t* zmap_to_compressed_ranges(const struct zmap* zm, off_t* byterange, int nrange, int* num);
void configure_zstream_for_zdata(const struct zmap* zm, struct z_stream_s* zs, long zoffset, off_t* poutoffset);
/* gzip flag byte */
#define GZ_ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
#define GZ_HEAD_CRC 0x02 /* bit 1 set: header CRC present */
#define GZ_EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
#define GZ_ORIG_NAME 0x08 /* bit 3 set: original file name present */
#define GZ_COMMENT 0x10 /* bit 4 set: file comment present */
#define GZ_RESERVED 0xE0 /* bits 5..7: reserved */
/* mtime is in bytes 4..7 of the gzip header */
static inline int zhead_has_mtime(const char* p) {
return !!(p[4] || p[5] || p[6] || p[7]);
}
static inline int zhead_has_fname(const char* p) {
return !!(p[3] & GZ_ORIG_NAME);
}
static inline const char* skip_zhead(const char* p)
{
const char* q = p + 10;
if (zhead_has_fname(p)) {
q += strlen(q)+1;
}
return q;
}
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