From 5f637f97c3427dc6e1a68678aefee1f62ca34d62 Mon Sep 17 00:00:00 2001 From: David Oberhollenzer Date: Mon, 14 Sep 2020 16:17:15 +0200 Subject: Implement ostream compressor wrapper Signed-off-by: David Oberhollenzer --- lib/fstream/compress/xz.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 lib/fstream/compress/xz.c (limited to 'lib/fstream/compress/xz.c') diff --git a/lib/fstream/compress/xz.c b/lib/fstream/compress/xz.c new file mode 100644 index 0000000..65bda0b --- /dev/null +++ b/lib/fstream/compress/xz.c @@ -0,0 +1,80 @@ +/* SPDX-License-Identifier: GPL-3.0-or-later */ +/* + * xz.c + * + * Copyright (C) 2019 David Oberhollenzer + */ +#include "../internal.h" + +#include + +typedef struct { + ostream_comp_t base; + + lzma_stream strm; +} ostream_xz_t; + +static int flush_inbuf(ostream_comp_t *base, bool finish) +{ + ostream_xz_t *xz = (ostream_xz_t *)base; + lzma_ret ret_xz; + size_t have; + + xz->strm.next_in = base->inbuf; + xz->strm.avail_in = base->inbuf_used; + + do { + xz->strm.next_out = base->outbuf; + xz->strm.avail_out = BUFSZ; + + ret_xz = lzma_code(&xz->strm, finish ? LZMA_FINISH : LZMA_RUN); + + if ((ret_xz != LZMA_OK) && (ret_xz != LZMA_STREAM_END)) { + fprintf(stderr, + "%s: internal error in XZ compressor.\n", + base->wrapped->get_filename(base->wrapped)); + return -1; + } + + have = BUFSZ - xz->strm.avail_out; + + if (base->wrapped->append(base->wrapped, base->outbuf, have)) + return -1; + } while (xz->strm.avail_out == 0); + + base->inbuf_used = 0; + return 0; +} + +static void cleanup(ostream_comp_t *base) +{ + ostream_xz_t *xz = (ostream_xz_t *)base; + + lzma_end(&xz->strm); +} + +ostream_comp_t *ostream_xz_create(const char *filename) +{ + ostream_xz_t *xz = calloc(1, sizeof(*xz)); + ostream_comp_t *base = (ostream_comp_t *)xz; + lzma_ret ret_xz; + + if (xz == NULL) { + fprintf(stderr, "%s: creating xz wrapper: %s.\n", + filename, strerror(errno)); + return NULL; + } + + ret_xz = lzma_easy_encoder(&xz->strm, LZMA_PRESET_DEFAULT, + LZMA_CHECK_CRC64); + if (ret_xz != LZMA_OK) { + fprintf(stderr, "%s: error initializing XZ compressor\n", + filename); + free(xz); + return NULL; + } + + base->flush_inbuf = flush_inbuf; + base->cleanup = cleanup; + return base; +} -- cgit v1.2.3