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/* gunzip.c - Alpine Package Keeper (APK)
*
* Copyright (C) 2008-2011 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 <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_bstream *bs;
z_stream zs;
int err;
apk_multipart_cb cb;
void *cbctx;
void *cbprev;
apk_blob_t cbarg;
};
static ssize_t gzi_read(void *stream, void *ptr, size_t size)
{
struct apk_gzip_istream *gis =
container_of(stream, struct apk_gzip_istream, is);
int r;
if (gis->err != 0) {
if (gis->err > 0)
return 0;
return gis->err;
}
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->err == 0) {
if (!APK_BLOB_IS_NULL(gis->cbarg)) {
r = gis->cb(gis->cbctx,
gis->err ? APK_MPART_END : APK_MPART_BOUNDARY,
gis->cbarg);
if (r > 0)
r = -ECANCELED;
if (r != 0) {
gis->err = r;
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 = gis->bs->read(gis->bs, APK_BLOB_NULL);
gis->cbprev = blob.ptr;
gis->zs.avail_in = blob.len;
gis->zs.next_in = (void *) gis->cbprev;
if (blob.len < 0) {
gis->err = blob.len;
goto ret;
} else if (gis->zs.avail_in == 0) {
gis->err = 1;
if (gis->cb != NULL) {
r = gis->cb(gis->cbctx, APK_MPART_END,
APK_BLOB_NULL);
if (r > 0)
r = -ECANCELED;
if (r != 0)
gis->err = r;
}
goto ret;
}
}
r = inflate(&gis->zs, Z_NO_FLUSH);
switch (r) {
case Z_STREAM_END:
/* Digest the inflated bytes */
if ((gis->bs->flags & APK_BSTREAM_EOF) &&
gis->zs.avail_in == 0)
gis->err = 1;
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->err) {
r = gis->cb(gis->cbctx,
gis->err ? APK_MPART_END : APK_MPART_BOUNDARY,
gis->cbarg);
if (r > 0)
r = -ECANCELED;
goto ret;
}
inflateEnd(&gis->zs);
if (inflateInit2(&gis->zs, 15+32) != Z_OK)
return -ENOMEM;
break;
case Z_OK:
break;
default:
gis->err = -EIO;
break;
}
}
ret:
if (size - gis->zs.avail_out == 0)
return gis->err < 0 ? gis->err : 0;
return size - gis->zs.avail_out;
}
static void gzi_close(void *stream)
{
struct apk_gzip_istream *gis =
container_of(stream, struct apk_gzip_istream, is);
inflateEnd(&gis->zs);
gis->bs->close(gis->bs, NULL);
free(gis);
}
struct apk_istream *apk_bstream_gunzip_mpart(struct apk_bstream *bs,
apk_multipart_cb cb, void *ctx)
{
struct apk_gzip_istream *gis;
if (IS_ERR_OR_NULL(bs)) return ERR_CAST(bs);
gis = malloc(sizeof(struct apk_gzip_istream));
if (!gis) goto err;
*gis = (struct apk_gzip_istream) {
.is.read = gzi_read,
.is.close = gzi_close,
.bs = bs,
.cb = cb,
.cbctx = ctx,
};
if (inflateInit2(&gis->zs, 15+32) != Z_OK) {
free(gis);
goto err;
}
return &gis->is;
err:
bs->close(bs, NULL);
return NULL;
}
struct apk_gzip_ostream {
struct apk_ostream os;
struct apk_ostream *output;
z_stream zs;
};
static ssize_t gzo_write(void *stream, const void *ptr, size_t size)
{
struct apk_gzip_ostream *gos = (struct apk_gzip_ostream *) stream;
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 = gos->output->write(gos->output, buffer, have);
if (r != have)
return -EIO;
}
}
return size;
}
static int gzo_close(void *stream)
{
struct apk_gzip_ostream *gos = (struct apk_gzip_ostream *) stream;
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 (gos->output->write(gos->output, buffer, have) != have)
rc = -EIO;
} while (r == Z_OK);
r = gos->output->close(gos->output);
if (r != 0)
rc = r;
deflateEnd(&gos->zs);
free(stream);
return rc;
}
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.write = gzo_write,
.os.close = gzo_close,
.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:
output->close(output);
return NULL;
}
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