New API functions iso_file_add_gzip_filter() and iso_gzip_get_refcounts().
This commit is contained in:
parent
c2f502b9a8
commit
00802a1934
@ -45,6 +45,7 @@ libisofs_libisofs_la_SOURCES = \
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libisofs/filters/xor_encrypt.c \
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libisofs/filters/external.c \
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libisofs/filters/zisofs.c \
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libisofs/filters/gzip.c \
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libisofs/util.h \
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libisofs/util.c \
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libisofs/util_rbtree.c \
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@ -24,6 +24,9 @@
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/* libisofs/filters/zisofs.c */
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#define ISO_FILTER_ZISOFS_DEV_ID 3
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/* libisofs/filters/gzip.c */
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#define ISO_FILTER_GZIP_DEV_ID 4
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typedef struct filter_context FilterContext;
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729
libisofs/filters/gzip.c
Normal file
729
libisofs/filters/gzip.c
Normal file
@ -0,0 +1,729 @@
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/*
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* Copyright (c) 2009 Thomas Schmitt
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*
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* This file is part of the libisofs project; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation. See COPYING file for details.
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*
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* It implements a filter facility which can pipe a IsoStream into gzip
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* compression resp. uncompression, read its output and forward it as IsoStream
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* output to an IsoFile.
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* The gzip compression is done via zlib by Jean-loup Gailly and Mark Adler
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* who state in <zlib.h>:
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* "The data format used by the zlib library is described by RFCs (Request for
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* Comments) 1950 to 1952 in the files http://www.ietf.org/rfc/rfc1950.txt
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* (zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format)."
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*
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*/
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#include "../libisofs.h"
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#include "../filter.h"
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#include "../fsource.h"
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#include "../util.h"
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#ifdef Libisofs_with_zliB
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#include <zlib.h>
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#else
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/* If zlib is not available then this code is a dummy */
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#endif
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/*
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* A filter that encodes or decodes the content of gzip compressed files.
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*/
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/* --------------------------- GzipFilterRuntime ------------------------- */
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/* Individual runtime properties exist only as long as the stream is opened.
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*/
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typedef struct
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{
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#ifdef Libisofs_with_zliB
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z_stream strm; /* The zlib processing context */
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#endif
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char *in_buffer;
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char *out_buffer;
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int in_buffer_size;
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int out_buffer_size;
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char *rpt; /* out_buffer + read_bytes */
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off_t in_counter;
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off_t out_counter;
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int do_flush; /* flush mode for deflate() changes at end of input */
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int error_ret;
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} GzipFilterRuntime;
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static
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int gzip_running_destroy(GzipFilterRuntime **running, int flag)
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{
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GzipFilterRuntime *o= *running;
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if (o == NULL)
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return 0;
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if (o->in_buffer != NULL)
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free(o->in_buffer);
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if (o->out_buffer != NULL)
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free(o->out_buffer);
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free((char *) o);
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*running = NULL;
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return 1;
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}
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static
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int gzip_running_new(GzipFilterRuntime **running, int flag)
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{
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GzipFilterRuntime *o;
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*running = o = calloc(sizeof(GzipFilterRuntime), 1);
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if (o == NULL) {
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return ISO_OUT_OF_MEM;
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}
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#ifdef Libisofs_with_zliB
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memset(&(o->strm), 0, sizeof(o->strm));
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#endif
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o->in_buffer = NULL;
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o->out_buffer = NULL;
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o->in_buffer_size = 0;
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o->out_buffer_size = 0;
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o->rpt = NULL;
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o->in_counter = 0;
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o->out_counter = 0;
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#ifdef Libisofs_with_zliB
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o->do_flush = Z_NO_FLUSH;
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#endif
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o->error_ret = 1;
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o->in_buffer_size= 2048;
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o->out_buffer_size= 2048;
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o->in_buffer = calloc(o->in_buffer_size, 1);
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o->out_buffer = calloc(o->out_buffer_size, 1);
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if (o->in_buffer == NULL || o->out_buffer == NULL)
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goto failed;
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o->rpt = o->out_buffer;
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return 1;
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failed:
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gzip_running_destroy(running, 0);
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return -1;
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}
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/* ---------------------------- GzipFilterStreamData --------------------- */
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/* Counts the number of active compression filters */
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static off_t gzip_ref_count = 0;
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/* Counts the number of active uncompression filters */
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static off_t gunzip_ref_count = 0;
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#ifdef Libisofs_with_zliB
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/* Parameter for deflateInit2() , see <zlib.h> */
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/* >>> ??? get this from zisofs.c ziso_compression_level ? */
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static int gzip_compression_level = 6;
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#endif /* Libisofs_with_zliB */
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/*
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* The data payload of an individual Gzip Filter IsoStream
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*/
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typedef struct
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{
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IsoStream *orig;
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off_t size; /* -1 means that the size is unknown yet */
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GzipFilterRuntime *running; /* is non-NULL when open */
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ino_t id;
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} GzipFilterStreamData;
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/* Each individual GzipFilterStreamData needs a unique id number. */
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/* >>> This is very suboptimal:
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The counter can rollover.
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*/
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static ino_t gzip_ino_id = 0;
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static
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int gzip_stream_uncompress(IsoStream *stream, void *buf, size_t desired);
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/*
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* Methods for the IsoStreamIface of a Gzip Filter object.
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*/
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/*
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* @param flag bit0= original stream is not open
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*/
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static
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int gzip_stream_close_flag(IsoStream *stream, int flag)
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{
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#ifdef Libisofs_with_zliB
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GzipFilterStreamData *data;
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if (stream == NULL) {
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return ISO_NULL_POINTER;
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}
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data = stream->data;
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if (data->running == NULL) {
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return 1;
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}
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if (stream->class->read == &gzip_stream_uncompress) {
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inflateEnd(&(data->running->strm));
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} else {
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deflateEnd(&(data->running->strm));
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}
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gzip_running_destroy(&(data->running), 0);
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if (flag & 1)
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return 1;
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return iso_stream_close(data->orig);
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#else
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return ISO_ZLIB_NOT_ENABLED;
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#endif
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}
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static
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int gzip_stream_close(IsoStream *stream)
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{
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return gzip_stream_close_flag(stream, 0);
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}
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/*
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* @param flag bit0= do not run .get_size() if size is < 0
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*/
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static
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int gzip_stream_open_flag(IsoStream *stream, int flag)
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{
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#ifdef Libisofs_with_zliB
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GzipFilterStreamData *data;
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GzipFilterRuntime *running = NULL;
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int ret;
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z_stream *strm;
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if (stream == NULL) {
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return ISO_NULL_POINTER;
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}
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data = (GzipFilterStreamData*) stream->data;
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if (data->running != NULL) {
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return ISO_FILE_ALREADY_OPENED;
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}
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if (data->size < 0 && !(flag & 1)) {
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/* Do the size determination run now, so that the size gets cached
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and .get_size() will not fail on an opened stream.
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*/
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stream->class->get_size(stream);
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}
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ret = gzip_running_new(&running,
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stream->class->read == &gzip_stream_uncompress);
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if (ret < 0) {
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return ret;
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}
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data->running = running;
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/* Start up zlib compression context */
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strm = &(running->strm);
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strm->zalloc = Z_NULL;
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strm->zfree = Z_NULL;
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strm->opaque = Z_NULL;
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if (stream->class->read == &gzip_stream_uncompress) {
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ret = inflateInit2(strm, 15 | 16);
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} else {
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ret = deflateInit2(strm, gzip_compression_level, Z_DEFLATED,
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15 | 16, 8, Z_DEFAULT_STRATEGY);
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}
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if (ret != Z_OK)
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return ISO_ZLIB_COMPR_ERR;
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strm->next_out = (Bytef *) running->out_buffer;
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strm->avail_out = running->out_buffer_size;
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/* Open input stream */
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ret = iso_stream_open(data->orig);
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if (ret < 0) {
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return ret;
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}
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return 1;
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#else
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return ISO_ZLIB_NOT_ENABLED;
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#endif
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}
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static
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int gzip_stream_open(IsoStream *stream)
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{
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return gzip_stream_open_flag(stream, 0);
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}
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/*
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* @param flag bit1= uncompress rather than compress
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*/
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static
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int gzip_stream_convert(IsoStream *stream, void *buf, size_t desired, int flag)
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{
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#ifdef Libisofs_with_zliB
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int ret, todo, cnv_ret, c_bytes;
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GzipFilterStreamData *data;
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GzipFilterRuntime *rng;
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size_t fill = 0;
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z_stream *strm;
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if (stream == NULL) {
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return ISO_NULL_POINTER;
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}
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data = stream->data;
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rng= data->running;
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if (rng == NULL) {
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return ISO_FILE_NOT_OPENED;
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}
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strm = &(rng->strm);
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if (rng->error_ret < 0) {
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return rng->error_ret;
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} else if (rng->error_ret == 0) {
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if (rng->out_buffer_size - strm->avail_out
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- (rng->rpt - rng->out_buffer) <= 0)
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return 0;
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}
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while (1) {
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/* Transfer eventual converted bytes from strm to buf */
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c_bytes = rng->out_buffer_size - strm->avail_out
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- (rng->rpt - rng->out_buffer);
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if (c_bytes > 0) {
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todo = desired - fill;
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if (todo > c_bytes)
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todo = c_bytes;
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memcpy(((char *) buf) + fill, rng->rpt, todo);
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rng->rpt += todo;
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fill += todo;
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rng->out_counter += todo;
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}
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if (fill >= desired || rng->error_ret == 0)
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return fill;
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/* All buffered out data are consumed now */
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rng->rpt = rng->out_buffer;
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strm->next_out = (Bytef *) rng->out_buffer;
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strm->avail_out = rng->out_buffer_size;
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if (strm->avail_in == 0) {
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/* All pending input is consumed. Get new input. */
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ret = iso_stream_read(data->orig, rng->in_buffer,
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rng->in_buffer_size);
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if (ret < 0)
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return (rng->error_ret = ret);
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if (ret == 0) {
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if (flag & 2) {
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/* >>> ??? what to do on (early) input EOF ? */;
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return (rng->error_ret = ISO_ZLIB_COMPR_ERR);
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} else {
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/* Tell zlib by the next call that it is over */
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rng->do_flush = Z_FINISH;
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}
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}
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strm->next_in = (Bytef *) rng->in_buffer;
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strm->avail_in = ret;
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rng->in_counter += ret;
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}
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/* Submit input and fetch output until input is consumed */
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while (1) {
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if (flag & 2) {
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cnv_ret = inflate(strm, rng->do_flush);
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} else {
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cnv_ret = deflate(strm, rng->do_flush);
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}
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if (cnv_ret == Z_STREAM_ERROR || cnv_ret == Z_BUF_ERROR) {
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return (rng->error_ret = ISO_ZLIB_COMPR_ERR);
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}
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if (strm->avail_out < rng->out_buffer_size)
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break; /* output is available */
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if (strm->avail_in == 0) /* all pending input consumed */
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break;
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}
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if (cnv_ret == Z_STREAM_END)
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rng->error_ret = 0;
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}
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return fill;
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#else
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return ISO_ZLIB_NOT_ENABLED;
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#endif
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}
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static
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int gzip_stream_compress(IsoStream *stream, void *buf, size_t desired)
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{
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return gzip_stream_convert(stream, buf, desired, 0);
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}
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static
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int gzip_stream_uncompress(IsoStream *stream, void *buf, size_t desired)
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{
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return gzip_stream_convert(stream, buf, desired, 2);
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}
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static
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off_t gzip_stream_get_size(IsoStream *stream)
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{
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int ret, ret_close;
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off_t count = 0;
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GzipFilterStreamData *data;
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char buf[64 * 1024];
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size_t bufsize = 64 * 1024;
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if (stream == NULL) {
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return ISO_NULL_POINTER;
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}
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data = stream->data;
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if (data->size >= 0) {
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return data->size;
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}
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/* Run filter command and count output bytes */
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ret = gzip_stream_open_flag(stream, 1);
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if (ret < 0) {
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return ret;
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}
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while (1) {
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ret = stream->class->read(stream, buf, bufsize);
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if (ret <= 0)
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break;
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count += ret;
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}
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ret_close = gzip_stream_close(stream);
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if (ret < 0)
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return ret;
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if (ret_close < 0)
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return ret_close;
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data->size = count;
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return count;
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}
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static
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int gzip_stream_is_repeatable(IsoStream *stream)
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{
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/* Only repeatable streams are accepted as orig */
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return 1;
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}
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static
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void gzip_stream_get_id(IsoStream *stream, unsigned int *fs_id,
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dev_t *dev_id, ino_t *ino_id)
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{
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GzipFilterStreamData *data;
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data = stream->data;
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*fs_id = ISO_FILTER_FS_ID;
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*dev_id = ISO_FILTER_GZIP_DEV_ID;
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*ino_id = data->id;
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}
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static
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void gzip_stream_free(IsoStream *stream)
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{
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GzipFilterStreamData *data;
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if (stream == NULL) {
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return;
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}
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data = stream->data;
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if (data->running != NULL) {
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gzip_stream_close(stream);
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}
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if (stream->class->read == &gzip_stream_uncompress) {
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if (--gunzip_ref_count < 0)
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gunzip_ref_count = 0;
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} else {
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if (--gzip_ref_count < 0)
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gzip_ref_count = 0;
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}
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iso_stream_unref(data->orig);
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free(data);
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}
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static
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int gzip_update_size(IsoStream *stream)
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{
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/* By principle size is determined only once */
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return 1;
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}
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static
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IsoStream *gzip_get_input_stream(IsoStream *stream, int flag)
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{
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GzipFilterStreamData *data;
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if (stream == NULL) {
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return NULL;
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}
|
||||
data = stream->data;
|
||||
return data->orig;
|
||||
}
|
||||
|
||||
|
||||
IsoStreamIface gzip_stream_compress_class = {
|
||||
2,
|
||||
"gzip",
|
||||
gzip_stream_open,
|
||||
gzip_stream_close,
|
||||
gzip_stream_get_size,
|
||||
gzip_stream_compress,
|
||||
gzip_stream_is_repeatable,
|
||||
gzip_stream_get_id,
|
||||
gzip_stream_free,
|
||||
gzip_update_size,
|
||||
gzip_get_input_stream
|
||||
};
|
||||
|
||||
|
||||
IsoStreamIface gzip_stream_uncompress_class = {
|
||||
2,
|
||||
"pizg",
|
||||
gzip_stream_open,
|
||||
gzip_stream_close,
|
||||
gzip_stream_get_size,
|
||||
gzip_stream_uncompress,
|
||||
gzip_stream_is_repeatable,
|
||||
gzip_stream_get_id,
|
||||
gzip_stream_free,
|
||||
gzip_update_size,
|
||||
gzip_get_input_stream
|
||||
};
|
||||
|
||||
|
||||
static
|
||||
void gzip_filter_free(FilterContext *filter)
|
||||
{
|
||||
/* no data are allocated */;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* @param flag bit1= Install a decompression filter
|
||||
*/
|
||||
static
|
||||
int gzip_filter_get_filter(FilterContext *filter, IsoStream *original,
|
||||
IsoStream **filtered, int flag)
|
||||
{
|
||||
IsoStream *str;
|
||||
GzipFilterStreamData *data;
|
||||
|
||||
if (filter == NULL || original == NULL || filtered == NULL) {
|
||||
return ISO_NULL_POINTER;
|
||||
}
|
||||
|
||||
str = calloc(sizeof(IsoStream), 1);
|
||||
if (str == NULL) {
|
||||
return ISO_OUT_OF_MEM;
|
||||
}
|
||||
data = calloc(sizeof(GzipFilterStreamData), 1);
|
||||
if (data == NULL) {
|
||||
free(str);
|
||||
return ISO_OUT_OF_MEM;
|
||||
}
|
||||
|
||||
/* These data items are not owned by this filter object */
|
||||
data->id = ++gzip_ino_id;
|
||||
data->orig = original;
|
||||
data->size = -1;
|
||||
data->running = NULL;
|
||||
|
||||
/* get reference to the source */
|
||||
iso_stream_ref(data->orig);
|
||||
|
||||
str->refcount = 1;
|
||||
str->data = data;
|
||||
if (flag & 2) {
|
||||
str->class = &gzip_stream_uncompress_class;
|
||||
gunzip_ref_count++;
|
||||
} else {
|
||||
str->class = &gzip_stream_compress_class;
|
||||
gzip_ref_count++;
|
||||
}
|
||||
|
||||
*filtered = str;
|
||||
|
||||
return ISO_SUCCESS;
|
||||
}
|
||||
|
||||
|
||||
/* To be called by iso_file_add_filter().
|
||||
* The FilterContext input parameter is not furtherly needed for the
|
||||
* emerging IsoStream.
|
||||
*/
|
||||
static
|
||||
int gzip_filter_get_compressor(FilterContext *filter, IsoStream *original,
|
||||
IsoStream **filtered)
|
||||
{
|
||||
return gzip_filter_get_filter(filter, original, filtered, 0);
|
||||
}
|
||||
|
||||
static
|
||||
int gzip_filter_get_uncompressor(FilterContext *filter, IsoStream *original,
|
||||
IsoStream **filtered)
|
||||
{
|
||||
return gzip_filter_get_filter(filter, original, filtered, 2);
|
||||
}
|
||||
|
||||
|
||||
/* Produce a parameter object suitable for iso_file_add_filter().
|
||||
* It may be disposed by free() after all those calls are made.
|
||||
*
|
||||
* This is quite a dummy as it does not carry individual data.
|
||||
* @param flag bit1= Install a decompression filter
|
||||
*/
|
||||
static
|
||||
int gzip_create_context(FilterContext **filter, int flag)
|
||||
{
|
||||
FilterContext *f;
|
||||
|
||||
*filter = f = calloc(1, sizeof(FilterContext));
|
||||
if (f == NULL) {
|
||||
return ISO_OUT_OF_MEM;
|
||||
}
|
||||
f->refcount = 1;
|
||||
f->version = 0;
|
||||
f->data = NULL;
|
||||
f->free = gzip_filter_free;
|
||||
if (flag & 2)
|
||||
f->get_filter = gzip_filter_get_uncompressor;
|
||||
else
|
||||
f->get_filter = gzip_filter_get_compressor;
|
||||
return ISO_SUCCESS;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* @param flag bit0= if_block_reduction rather than if_reduction
|
||||
* bit1= Install a decompression filter
|
||||
* bit2= only inquire availability of gzip filtering
|
||||
* bit3= do not inquire size
|
||||
*/
|
||||
int gzip_add_filter(IsoFile *file, int flag)
|
||||
{
|
||||
|
||||
#ifdef Libisofs_with_zliB
|
||||
|
||||
int ret;
|
||||
FilterContext *f = NULL;
|
||||
IsoStream *stream;
|
||||
off_t original_size = 0, filtered_size = 0;
|
||||
|
||||
if (flag & 4)
|
||||
return 2;
|
||||
|
||||
original_size = iso_file_get_size(file);
|
||||
|
||||
ret = gzip_create_context(&f, flag & 2);
|
||||
if (ret < 0) {
|
||||
return ret;
|
||||
}
|
||||
ret = iso_file_add_filter(file, f, 0);
|
||||
free(f);
|
||||
if (ret < 0) {
|
||||
return ret;
|
||||
}
|
||||
if (flag & 8) /* size will be filled in by caller */
|
||||
return ISO_SUCCESS;
|
||||
|
||||
/* Run a full filter process getsize so that the size is cached */
|
||||
stream = iso_file_get_stream(file);
|
||||
filtered_size = iso_stream_get_size(stream);
|
||||
if (filtered_size < 0) {
|
||||
iso_file_remove_filter(file, 0);
|
||||
return filtered_size;
|
||||
}
|
||||
if ((filtered_size >= original_size ||
|
||||
((flag & 1) && filtered_size / 2048 >= original_size / 2048))
|
||||
&& !(flag & 2)){
|
||||
ret = iso_file_remove_filter(file, 0);
|
||||
if (ret < 0) {
|
||||
return ret;
|
||||
}
|
||||
return 2;
|
||||
}
|
||||
return ISO_SUCCESS;
|
||||
|
||||
#else
|
||||
|
||||
return ISO_ZLIB_NOT_ENABLED;
|
||||
|
||||
#endif /* ! Libisofs_with_zliB */
|
||||
|
||||
}
|
||||
|
||||
|
||||
/* API function */
|
||||
int iso_file_add_gzip_filter(IsoFile *file, int flag)
|
||||
{
|
||||
return gzip_add_filter(file, flag & ~8);
|
||||
}
|
||||
|
||||
|
||||
/* API function */
|
||||
int iso_gzip_get_refcounts(off_t *gzip_count, off_t *gunzip_count, int flag)
|
||||
{
|
||||
*gzip_count = gzip_ref_count;
|
||||
*gunzip_count = gunzip_ref_count;
|
||||
return ISO_SUCCESS;
|
||||
}
|
||||
|
||||
@ -212,7 +212,7 @@ static ino_t ziso_ino_id = 0;
|
||||
|
||||
|
||||
/*
|
||||
* Methods for the IsoStreamIface of an External Filter object.
|
||||
* Methods for the IsoStreamIface of an Zisofs Filter object.
|
||||
*/
|
||||
|
||||
static
|
||||
|
||||
@ -4749,6 +4749,7 @@ int iso_local_set_attrs(char *disk_path, size_t num_attrs, char **names,
|
||||
* iso_file_add_external_filter()
|
||||
* and internal filters
|
||||
* iso_file_add_zisofs_filter()
|
||||
* iso_file_add_gzip_filter()
|
||||
* which may or may not be available depending on compile time settings and
|
||||
* installed software packages like libz.
|
||||
*
|
||||
@ -4913,7 +4914,7 @@ int iso_stream_get_external_filter(IsoStream *stream,
|
||||
|
||||
/* ts A90409 */
|
||||
/**
|
||||
* Install a zisofs filter on top of the content stream of a data * file.
|
||||
* Install a zisofs filter on top of the content stream of a data file.
|
||||
* zisofs is a compression format which is decompressed by some Linux kernels.
|
||||
* See also doc/zisofs_format.txt .
|
||||
* The filter will not be installed if its output size is not smaller than
|
||||
@ -5040,6 +5041,50 @@ int iso_zisofs_get_params(struct iso_zisofs_ctrl *params, int flag);
|
||||
int iso_node_zf_by_magic(IsoNode *node, int flag);
|
||||
|
||||
|
||||
/* ts A90414 */
|
||||
/**
|
||||
* Install a gzip or gunzip filter on top of the content stream of a data file.
|
||||
* gzip is a compression format which is used by programs gzip and gunzip.
|
||||
* The filter will not be installed if its output size is not smaller than
|
||||
* the size of the input stream.
|
||||
* This is only enabled if the use of libz was enabled at compile time.
|
||||
* @param file
|
||||
* The data file node which shall show filtered content.
|
||||
* @param flag
|
||||
* Bitfield for control purposes
|
||||
* bit0= Do not install filter if the number of output blocks is
|
||||
* not smaller than the number of input blocks. Block size is 2048.
|
||||
* bit1= Install a decompression filter rather than one for compression.
|
||||
* bit2= Only inquire availability of gzip filtering. file may be NULL.
|
||||
* If available return 2, else return error.
|
||||
* bit3= is reserved for internal use and will be forced to 0
|
||||
* @return
|
||||
* 1 on success, 2 if filter available but installation revoked
|
||||
* <0 on error, e.g. ISO_ZLIB_NOT_ENABLED
|
||||
*
|
||||
* @since 0.6.18
|
||||
*/
|
||||
int iso_file_add_gzip_filter(IsoFile *file, int flag);
|
||||
|
||||
|
||||
/* ts A90414 */
|
||||
/**
|
||||
* Inquire the number of gzip compression and uncompression filters which
|
||||
* are in use.
|
||||
* @param gzip_count
|
||||
* Will return the number of currently installed compression filters.
|
||||
* @param gunzip_count
|
||||
* Will return the number of currently installed uncompression filters.
|
||||
* @param flag
|
||||
* Bitfield for control purposes, unused yet, submit 0
|
||||
* @return
|
||||
* 1 on success, <0 on error
|
||||
*
|
||||
* @since 0.6.18
|
||||
*/
|
||||
int iso_gzip_get_refcounts(off_t *gzip_count, off_t *gunzip_count, int flag);
|
||||
|
||||
|
||||
/* ------------------------------------------------------------------------- */
|
||||
|
||||
#ifdef LIBISOFS_WITHOUT_LIBBURN
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user