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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;
EVP_MD_CTX mdctx;
void *mdblock;
apk_multipart_cb cb;
void *cbctx;
};
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) {
apk_blob_t blob;
if (gis->cb != NULL && gis->mdblock != NULL) {
/* Digest the inflated bytes */
EVP_DigestUpdate(&gis->mdctx, gis->mdblock,
(void *)gis->zs.next_in - gis->mdblock);
}
blob = gis->bs->read(gis->bs, APK_BLOB_NULL);
gis->mdblock = blob.ptr;
gis->zs.avail_in = blob.len;
gis->zs.next_in = (void *) gis->mdblock;
if (gis->zs.avail_in < 0) {
gis->z_err = Z_DATA_ERROR;
return size - gis->zs.avail_out;
} else if (gis->zs.avail_in == 0) {
if (gis->cb != NULL)
gis->cb(gis->cbctx, &gis->mdctx,
APK_MPART_END);
gis->z_err = Z_STREAM_END;
return size - gis->zs.avail_out;
}
}
gis->z_err = inflate(&gis->zs, Z_NO_FLUSH);
if (gis->z_err == Z_STREAM_END) {
/* Digest the inflated bytes */
if (gis->cb != NULL) {
EVP_DigestUpdate(&gis->mdctx, gis->mdblock,
(void *)gis->zs.next_in - gis->mdblock);
gis->mdblock = gis->zs.next_in;
gis->cb(gis->cbctx, &gis->mdctx,
APK_MPART_BOUNDARY);
}
inflateEnd(&gis->zs);
if (inflateInit2(&gis->zs, 15+32) != Z_OK)
return -1;
gis->z_err = Z_OK;
}
}
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);
if (gis->cb != NULL)
EVP_MD_CTX_cleanup(&gis->mdctx);
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 (bs == NULL)
return NULL;
gis = malloc(sizeof(struct apk_gzip_istream));
if (gis == NULL)
return NULL;
*gis = (struct apk_gzip_istream) {
.is.read = gz_read,
.is.close = gz_close,
.bs = bs,
.z_err = 0,
.cb = cb,
.cbctx = ctx,
};
if (inflateInit2(&gis->zs, 15+32) != Z_OK) {
free(gis);
return NULL;
}
if (gis->cb != NULL) {
EVP_MD_CTX_init(&gis->mdctx);
cb(ctx, &gis->mdctx, APK_MPART_BEGIN);
}
return &gis->is;
}
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