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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* gzip.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "../internal.h"
#include <zlib.h>
typedef struct {
istream_comp_t base;
z_stream strm;
} istream_gzip_t;
static int precache(istream_t *base)
{
istream_t *wrapped = ((istream_comp_t *)base)->wrapped;
istream_gzip_t *gzip = (istream_gzip_t *)base;
int ret;
for (;;) {
ret = istream_precache(wrapped);
if (ret != 0)
return ret;
gzip->strm.avail_in = wrapped->buffer_used;
gzip->strm.next_in = wrapped->buffer;
gzip->strm.avail_out = BUFSZ - base->buffer_used;
gzip->strm.next_out = base->buffer + base->buffer_used;
ret = inflate(&gzip->strm, Z_NO_FLUSH);
wrapped->buffer_offset = wrapped->buffer_used -
gzip->strm.avail_in;
base->buffer_used = BUFSZ - gzip->strm.avail_out;
if (ret == Z_BUF_ERROR)
break;
if (ret == Z_STREAM_END) {
base->eof = true;
break;
}
if (ret != Z_OK) {
fprintf(stderr,
"%s: internal error in gzip decoder.\n",
wrapped->get_filename(wrapped));
return -1;
}
}
return 0;
}
static void cleanup(istream_comp_t *base)
{
istream_gzip_t *gzip = (istream_gzip_t *)base;
inflateEnd(&gzip->strm);
}
istream_comp_t *istream_gzip_create(const char *filename)
{
istream_gzip_t *gzip = calloc(1, sizeof(*gzip));
istream_comp_t *base = (istream_comp_t *)gzip;
int ret;
if (gzip == NULL) {
fprintf(stderr, "%s: creating gzip decoder: %s.\n",
filename, strerror(errno));
return NULL;
}
ret = inflateInit2(&gzip->strm, 16 + 15);
if (ret != Z_OK) {
fprintf(stderr,
"%s: internal error creating gzip reader.\n",
filename);
free(gzip);
return NULL;
}
((istream_t *)base)->precache = precache;
base->cleanup = cleanup;
return base;
}
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