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/*
* Copyright (c) 2020 Ori Bernstein
* Copyright (c) 2021 Stefan Sperling <stsp@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
struct got_delta_block {
off_t len;
off_t offset;
uint32_t hash;
};
struct got_delta_table {
struct got_delta_block *blocks;
int nblocks;
int nalloc;
/*
* Index for blocks. offs[n] is zero when the slot is free,
* otherwise it points to blocks[offs[n] - 1].
*/
uint32_t *offs;
int len;
int size;
};
struct got_delta_instruction {
int copy;
off_t offset;
off_t len;
};
enum {
GOT_DELTIFY_MINCHUNK = 32,
GOT_DELTIFY_MAXCHUNK = 8192,
GOT_DELTIFY_SPLITMASK = (1 << 8) - 1,
GOT_DELTIFY_STRETCHMAX = (1 << 24) - 1,
};
const struct got_error *got_deltify_init(struct got_delta_table **dt, FILE *f,
off_t fileoffset, off_t filesize, uint32_t seed);
const struct got_error *got_deltify_init_mem(struct got_delta_table **dt,
uint8_t *data, off_t fileoffset, off_t filesize, uint32_t seed);
const struct got_error *got_deltify(struct got_delta_instruction **deltas,
int *ndeltas, FILE *f, off_t fileoffset, off_t filesize, uint32_t seed,
struct got_delta_table *dt, FILE *basefile, off_t basefile_offset0,
off_t basefile_size);
const struct got_error *got_deltify_file_mem(
struct got_delta_instruction **deltas, int *ndeltas,
FILE *f, off_t fileoffset, off_t filesize, uint32_t seed,
struct got_delta_table *dt, uint8_t *basedata, off_t basefile_offset0,
off_t basefile_size);
const struct got_error *got_deltify_mem_file(
struct got_delta_instruction **deltas, int *ndeltas,
uint8_t *data, off_t fileoffset, off_t filesize, uint32_t seed,
struct got_delta_table *dt, FILE *basefile, off_t basefile_offset0,
off_t basefile_size);
const struct got_error *got_deltify_mem_mem(
struct got_delta_instruction **deltas, int *ndeltas,
uint8_t *data, off_t fileoffset, off_t filesize, uint32_t seed,
struct got_delta_table *dt, uint8_t *basedata, off_t basefile_offset0,
off_t basefile_size);
void got_deltify_free(struct got_delta_table *dt);
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