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/*
* FFI wrappers for `lzma-streams`
*
* Copyright (c) 2014, Herbert Valerio Riedel <hvr@gnu.org>
*
* This code is BSD3 licensed, see ../LICENSE file for details
*
*/
#include <stdio.h>
#include <string.h>
#include <lzma.h>
#include <HsFFI.h>
HsInt
hs_lzma_init_decoder(lzma_stream *ls, HsBool autolzma, uint64_t memlimit, uint32_t flags)
{
/* recommended super-portable initialization */
const lzma_stream ls_init = LZMA_STREAM_INIT;
*ls = ls_init;
const lzma_ret ret = (autolzma ? lzma_auto_decoder : lzma_stream_decoder)(ls, memlimit, flags);
return ret;
}
HsInt
hs_lzma_init_encoder(lzma_stream *ls, uint32_t preset, HsInt check, HsInt threads)
{
/* recommended super-portable initialization */
const lzma_stream ls_init = LZMA_STREAM_INIT;
*ls = ls_init;
lzma_mt mt = {
.threads = threads,
// Use the default preset (6) for LZMA2.
// To use a preset, filters must be set to NULL.
.preset = preset,
// Use CRC64 for integrity checking. See also
// 01_compress_easy.c about choosing the integrity check.
.check = check,
};
const lzma_ret ret = lzma_stream_encoder_mt(ls, &mt);
return ret;
}
void
hs_lzma_done(lzma_stream *ls)
{
lzma_end(ls);
}
HsInt
hs_lzma_run(lzma_stream *const ls, const HsInt action,
const uint8_t ibuf[], const HsInt ibuf_len,
uint8_t obuf[], const HsInt obuf_len)
{
ls->next_in = ibuf;
ls->avail_in = ibuf_len;
ls->next_out = obuf;
ls->avail_out = obuf_len;
// paranoia
memset(obuf, 0, obuf_len);
const lzma_ret ret = lzma_code(ls, action);
// paranoia
ls->next_in = NULL;
ls->next_out = NULL;
return ret;
}
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