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/* adb_comp.c - Alpine Package Keeper (APK)
*
* Copyright (C) 2021 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-only
*/
#include "apk_defines.h"
#include "adb.h"
struct apk_istream *adb_decompress(struct apk_istream *is, adb_comp_t *compression)
{
adb_comp_t c = -1;
if (IS_ERR(is)) return is;
uint8_t *buf = apk_istream_peek(is, 4);
if (IS_ERR(buf)) return ERR_PTR(apk_istream_close_error(is, PTR_ERR(buf)));
if (memcmp(buf, "ADB", 3) != 0) return ERR_PTR(apk_istream_close_error(is, -APKE_ADB_HEADER));
switch (buf[3]) {
case '.':
c = ADB_COMP_NONE;
break;
case 'd':
c = ADB_COMP_DEFLATE;
apk_istream_get(is, 4);
is = apk_istream_deflate(is);
break;
}
if (c == -1) return ERR_PTR(apk_istream_close_error(is, -APKE_ADB_COMPRESSION));
if (compression) *compression = c;
return is;
}
struct apk_ostream *adb_compress(struct apk_ostream *os, adb_comp_t compression)
{
if (IS_ERR(os)) return os;
switch (compression) {
case ADB_COMP_NONE:
return os;
case ADB_COMP_DEFLATE:
if (apk_ostream_write(os, "ADBd", 4) < 0) goto err;
return apk_ostream_deflate(os);
}
err:
apk_ostream_cancel(os, -APKE_ADB_COMPRESSION);
return ERR_PTR(apk_ostream_close(os));
}
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