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/* io_gunzip.c - Alpine Package Keeper (APK)
*
* Copyright (C) 2008-2011 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-only
*/
#include <errno.h>
#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_istream *zis;
z_stream zs;
apk_multipart_cb cb;
void *cbctx;
void *cbprev;
apk_blob_t cbarg;
};
static void gzi_get_meta(struct apk_istream *is, struct apk_file_meta *meta)
{
struct apk_gzip_istream *gis = container_of(is, struct apk_gzip_istream, is);
apk_istream_get_meta(gis->zis, meta);
}
static int gzi_boundary_change(struct apk_gzip_istream *gis)
{
int r;
if (!gis->cb) return 0;
r = gis->cb(gis->cbctx, gis->is.err ? APK_MPART_END : APK_MPART_BOUNDARY, gis->cbarg);
if (r > 0) r = -ECANCELED;
if (r != 0) gis->is.err = r;
return r;
}
static ssize_t gzi_read(struct apk_istream *is, void *ptr, size_t size)
{
struct apk_gzip_istream *gis = container_of(is, struct apk_gzip_istream, is);
int r;
gis->zs.avail_out = size;
gis->zs.next_out = ptr;
while (gis->zs.avail_out != 0 && gis->is.err == 0) {
if (!APK_BLOB_IS_NULL(gis->cbarg)) {
if (gzi_boundary_change(gis))
goto ret;
gis->cbarg = APK_BLOB_NULL;
}
if (gis->zs.avail_in == 0) {
apk_blob_t blob;
if (gis->cb != NULL && gis->cbprev != NULL &&
gis->cbprev != gis->zs.next_in) {
gis->cb(gis->cbctx, APK_MPART_DATA,
APK_BLOB_PTR_LEN(gis->cbprev,
(void *)gis->zs.next_in - gis->cbprev));
}
blob = apk_istream_get_all(gis->zis);
gis->cbprev = blob.ptr;
gis->zs.avail_in = blob.len;
gis->zs.next_in = (void *) gis->cbprev;
if (blob.len < 0) {
gis->is.err = blob.len;
goto ret;
} else if (gis->zs.avail_in == 0) {
gis->is.err = 1;
gis->cbarg = APK_BLOB_NULL;
gzi_boundary_change(gis);
goto ret;
}
}
r = inflate(&gis->zs, Z_NO_FLUSH);
switch (r) {
case Z_STREAM_END:
/* Digest the inflated bytes */
if (gis->zis->err && gis->zs.avail_in == 0)
gis->is.err = gis->zis->err;
if (gis->cb != NULL) {
gis->cbarg = APK_BLOB_PTR_LEN(gis->cbprev, (void *) gis->zs.next_in - gis->cbprev);
gis->cbprev = gis->zs.next_in;
}
/* If we hit end of the bitstream (not end
* of just this gzip), we need to do the
* callback here, as we won't be called again.
* For boundaries it should be postponed to not
* be called until next gzip read is started. */
if (gis->is.err) {
gzi_boundary_change(gis);
goto ret;
}
inflateEnd(&gis->zs);
if (inflateInit2(&gis->zs, 15+32) != Z_OK)
return -ENOMEM;
if (gis->cb) goto ret;
break;
case Z_OK:
break;
default:
gis->is.err = -EIO;
break;
}
}
ret:
return size - gis->zs.avail_out;
}
static void gzi_close(struct apk_istream *is)
{
struct apk_gzip_istream *gis = container_of(is, struct apk_gzip_istream, is);
inflateEnd(&gis->zs);
apk_istream_close(gis->zis);
free(gis);
}
static const struct apk_istream_ops gunzip_istream_ops = {
.get_meta = gzi_get_meta,
.read = gzi_read,
.close = gzi_close,
};
struct apk_istream *apk_istream_gunzip_mpart(struct apk_istream *is, apk_multipart_cb cb, void *ctx)
{
struct apk_gzip_istream *gis;
if (IS_ERR_OR_NULL(is)) return ERR_CAST(is);
gis = malloc(sizeof(*gis) + apk_io_bufsize);
if (!gis) goto err;
*gis = (struct apk_gzip_istream) {
.is.ops = &gunzip_istream_ops,
.is.buf = (uint8_t*)(gis + 1),
.is.buf_size = apk_io_bufsize,
.zis = is,
.cb = cb,
.cbctx = ctx,
};
if (inflateInit2(&gis->zs, 15+32) != Z_OK) {
free(gis);
goto err;
}
return &gis->is;
err:
apk_istream_close(is);
return ERR_PTR(-ENOMEM);
}
struct apk_gzip_ostream {
struct apk_ostream os;
struct apk_ostream *output;
z_stream zs;
};
static ssize_t gzo_write(struct apk_ostream *os, const void *ptr, size_t size)
{
struct apk_gzip_ostream *gos = container_of(os, struct apk_gzip_ostream, os);
unsigned char buffer[1024];
ssize_t have, r;
gos->zs.avail_in = size;
gos->zs.next_in = (void *) ptr;
while (gos->zs.avail_in) {
gos->zs.avail_out = sizeof(buffer);
gos->zs.next_out = buffer;
r = deflate(&gos->zs, Z_NO_FLUSH);
if (r == Z_STREAM_ERROR)
return -EIO;
have = sizeof(buffer) - gos->zs.avail_out;
if (have != 0) {
r = apk_ostream_write(gos->output, buffer, have);
if (r != have)
return -EIO;
}
}
return size;
}
static int gzo_close(struct apk_ostream *os)
{
struct apk_gzip_ostream *gos = container_of(os, struct apk_gzip_ostream, os);
unsigned char buffer[1024];
size_t have;
int r, rc = 0;
do {
gos->zs.avail_out = sizeof(buffer);
gos->zs.next_out = buffer;
r = deflate(&gos->zs, Z_FINISH);
have = sizeof(buffer) - gos->zs.avail_out;
if (apk_ostream_write(gos->output, buffer, have) != have)
rc = -EIO;
} while (r == Z_OK);
r = apk_ostream_close(gos->output);
if (r != 0)
rc = r;
deflateEnd(&gos->zs);
free(gos);
return rc;
}
static const struct apk_ostream_ops gzip_ostream_ops = {
.write = gzo_write,
.close = gzo_close,
};
struct apk_ostream *apk_ostream_gzip(struct apk_ostream *output)
{
struct apk_gzip_ostream *gos;
if (IS_ERR_OR_NULL(output)) return ERR_CAST(output);
gos = malloc(sizeof(struct apk_gzip_ostream));
if (gos == NULL) goto err;
*gos = (struct apk_gzip_ostream) {
.os.ops = &gzip_ostream_ops,
.output = output,
};
if (deflateInit2(&gos->zs, 9, Z_DEFLATED, 15 | 16, 8,
Z_DEFAULT_STRATEGY) != Z_OK) {
free(gos);
goto err;
}
return &gos->os;
err:
apk_ostream_close(output);
return ERR_PTR(-ENOMEM);
}
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