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/* gunzip.c - Alpine Package Keeper (APK)
*
* Copyright (C) 2008 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation. See http://www.gnu.org/ for details.
*/
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <malloc.h>
#include <zlib.h>
#include "apk_defines.h"
#include "apk_io.h"
struct apk_gzip_istream {
struct apk_istream is;
struct apk_bstream *bs;
z_stream zs;
int z_err;
};
static size_t gz_read(void *stream, void *ptr, size_t size)
{
struct apk_gzip_istream *gis =
container_of(stream, struct apk_gzip_istream, is);
if (gis->z_err == Z_DATA_ERROR || gis->z_err == Z_ERRNO)
return -1;
if (gis->z_err == Z_STREAM_END)
return 0;
if (ptr == NULL)
return apk_istream_skip(&gis->is, size);
gis->zs.avail_out = size;
gis->zs.next_out = ptr;
while (gis->zs.avail_out != 0 && gis->z_err == Z_OK) {
if (gis->zs.avail_in == 0) {
gis->zs.avail_in = gis->bs->read(gis->bs, (void **) &gis->zs.next_in);
if (gis->zs.avail_in < 0) {
gis->z_err = Z_DATA_ERROR;
return size - gis->zs.avail_out;
}
}
gis->z_err = inflate(&gis->zs, Z_NO_FLUSH);
}
if (gis->z_err != Z_OK && gis->z_err != Z_STREAM_END)
return -1;
return size - gis->zs.avail_out;
}
static void gz_close(void *stream)
{
struct apk_gzip_istream *gis =
container_of(stream, struct apk_gzip_istream, is);
inflateEnd(&gis->zs);
free(gis);
}
struct apk_istream *apk_gunzip_bstream(struct apk_bstream *bs)
{
struct apk_gzip_istream *gis;
gis = malloc(sizeof(struct apk_gzip_istream));
if (gis == NULL)
return NULL;
*gis = (struct apk_gzip_istream) {
.is.read = gz_read,
.is.splice = apk_istream_splice,
.is.close = gz_close,
.bs = bs,
.z_err = 0,
};
if (inflateInit2(&gis->zs, 15+32) != Z_OK) {
free(gis);
return NULL;
}
return &gis->is;
}
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