New API call iso_file_add_zisofs_filter() (needs -lz and <zlib.h>).
This does not produce ZF entries yet but filtered file content already suits mkzftree -uFrelease-1.5.4.branch
parent
5732726a27
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a809a87eef
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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 zisofs
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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 zisofs format was invented by H. Peter Anvin. See doc/zisofs_format.txt
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* It is writeable and readable by zisofs-tools, readable by Linux kernels.
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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 zisofs compressed files.
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*/
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/* --------------------------- ZisofsFilterRuntime ------------------------- */
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/* Sizes to be used for compression. Decompression learns from input header. */
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#define Libisofs_zisofs_block_log2 15
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#define Libisofs_zisofs_block_sizE 32768
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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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int state; /* processing: 0= header, 1= block pointers, 2= data blocks */
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int block_size;
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int block_pointer_fill;
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int block_pointer_rpos;
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char *read_buffer;
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char *block_buffer;
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int buffer_size;
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int buffer_fill;
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int buffer_rpos;
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off_t block_counter;
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off_t in_counter;
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off_t out_counter;
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} ZisofsFilterRuntime;
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static
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int ziso_running_destroy(ZisofsFilterRuntime **running, int flag)
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{
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ZisofsFilterRuntime *o= *running;
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if (o == NULL)
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return 0;
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if (o->read_buffer != NULL)
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free(o->read_buffer);
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if (o->block_buffer != NULL)
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free(o->block_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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/*
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* @param flag bit0= do not set block_size, do not allocate buffers
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*/
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static
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int ziso_running_new(ZisofsFilterRuntime **running, int flag)
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{
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ZisofsFilterRuntime *o;
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*running = o = calloc(sizeof(ZisofsFilterRuntime), 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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o->state = 0;
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o->block_pointer_fill = 0;
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o->block_pointer_rpos = 0;
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o->block_size= 0;
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o->read_buffer = NULL;
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o->block_buffer = NULL;
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o->buffer_size = 0;
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o->buffer_fill = 0;
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o->buffer_rpos = 0;
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o->block_counter = 0;
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o->in_counter = 0;
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o->out_counter = 0;
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if (flag & 1)
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return 1;
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o->block_size = Libisofs_zisofs_block_sizE;
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#ifdef Libisofs_with_zliB
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o->buffer_size= compressBound((uLong) Libisofs_zisofs_block_sizE);
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#else
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o->buffer_size= 2 * Libisofs_zisofs_block_sizE;
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#endif
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o->read_buffer = calloc(o->block_size, 1);
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o->block_buffer = calloc(o->buffer_size, 1);
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if (o->block_buffer == NULL || o->read_buffer == NULL)
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goto failed;
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return 1;
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failed:
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ziso_running_destroy(running, 0);
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return -1;
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}
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/* ---------------------------- ZisofsFilterStreamData --------------------- */
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/* The first 8 bytes of a zisofs compressed data file */
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static unsigned char zisofs_magic[9] =
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{0x37, 0xE4, 0x53, 0x96, 0xC9, 0xDB, 0xD6, 0x07};
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/*
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* The data payload of an individual Zisofs Filter IsoStream
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*/
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typedef struct
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{
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ino_t id;
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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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uint32_t orig_size;
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uint32_t *block_pointers; /* Cache for output block addresses. They get
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written before the data and so need 2 passes.
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This cache avoids surplus passes.
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*/
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ZisofsFilterRuntime *running; /* is non-NULL when open */
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} ZisofsFilterStreamData;
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/* Each individual ZisofsFilterStreamData 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 ziso_ino_id = 0;
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/*
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* Methods for the IsoStreamIface of an External 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 ziso_stream_close_flag(IsoStream *stream, int flag)
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{
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ZisofsFilterStreamData *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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ziso_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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}
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static
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int ziso_stream_close(IsoStream *stream)
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{
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return ziso_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 ziso_stream_open_flag(IsoStream *stream, int flag)
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{
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ZisofsFilterStreamData *data;
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ZisofsFilterRuntime *running = NULL;
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int ret;
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if (stream == NULL) {
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return ISO_NULL_POINTER;
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}
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data = (ZisofsFilterStreamData*) 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 = ziso_running_new(&running, 0);
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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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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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}
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static
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int ziso_stream_open(IsoStream *stream)
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{
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return ziso_stream_open_flag(stream, 0);
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}
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static
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int ziso_stream_read(IsoStream *stream, void *buf, size_t desired)
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{
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int ret, todo, i;
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ZisofsFilterStreamData *data;
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ZisofsFilterRuntime *rng;
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size_t fill = 0;
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off_t orig_size, next_pt;
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char *cbuf = buf;
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#ifdef Libisofs_with_zliB
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uLongf buf_len;
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#else
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unsigned long buf_len;
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#endif
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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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while (1) {
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if (rng->state == 0) {
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/* Delivering file header */
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if (rng->buffer_fill == 0) {
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memcpy(rng->block_buffer, zisofs_magic, 8);
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orig_size = iso_stream_get_size(data->orig);
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if (orig_size > 4294967295.0) {
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/* >>> cannot compress file >= 4 GiB to zisofs */;
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/* <<< need better error code (or fallback strategy ?) */
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return ISO_FILE_READ_ERROR;
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}
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data->orig_size = orig_size;
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iso_lsb((unsigned char *) (rng->block_buffer + 8),
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(uint32_t) orig_size, 4);
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rng->block_buffer[12] = 4;
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rng->block_buffer[13] = Libisofs_zisofs_block_log2;
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rng->block_buffer[14] = rng->block_buffer[15] = 0;
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rng->buffer_fill = 16;
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rng->buffer_rpos = 0;
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} else if (rng->buffer_rpos >= rng->buffer_fill) {
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rng->buffer_fill = rng->buffer_rpos = 0;
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rng->state = 1; /* header is delivered */
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}
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}
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if (rng->state == 1) {
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/* Delivering block pointers */;
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if (rng->block_pointer_fill == 0) {
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/* Initialize block pointer writing */
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rng->block_pointer_rpos = 0;
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rng->block_pointer_fill = data->orig_size / rng->block_size
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+ 1 + !!(orig_size % rng->block_size);
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if (data->block_pointers == NULL) {
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/* On the first pass, create pointer array with all 0s */
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data->block_pointers = calloc(rng->block_pointer_fill, 4);
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if (data->block_pointers == NULL) {
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rng->block_pointer_fill = 0;
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return ISO_OUT_OF_MEM;
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}
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}
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}
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if (rng->buffer_rpos >= rng->buffer_fill) {
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if (rng->block_pointer_rpos >= rng->block_pointer_fill) {
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rng->buffer_fill = rng->buffer_rpos = 0;
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rng->block_counter = 0;
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data->block_pointers[0] = 16 + rng->block_pointer_fill * 4;
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rng->state = 2; /* block pointers are delivered */
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} else {
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/* Provide a buffer full of block pointers */
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todo = rng->block_pointer_fill - rng->block_pointer_rpos;
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if (todo * 4 > rng->buffer_size)
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todo = rng->buffer_size / 4;
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memcpy(rng->block_buffer,
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data->block_pointers + 4 * rng->block_pointer_rpos,
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todo * 4);
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rng->buffer_rpos = 0;
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rng->buffer_fill = todo * 4;
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rng->block_pointer_rpos += todo;
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}
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}
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}
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if (rng->state == 2 && rng->buffer_rpos >= rng->buffer_fill) {
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/* >>> Delivering data blocks */;
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ret = iso_stream_read(data->orig, rng->read_buffer,
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rng->block_size);
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if (ret > 0) {
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rng->in_counter += ret;
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if (rng->in_counter > data->orig_size) {
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/* >>> Input size overflow */
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/* <<< need better error code */
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return ISO_FILE_READ_ERROR;
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}
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/* Check whether all 0 : represent as 0-length block */;
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for (i = 0; i < ret; i++)
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if (rng->read_buffer[i])
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break;
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if (i >= ret) { /* All 0-bytes. Bypass compression. */
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buf_len = 0;
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} else {
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buf_len = rng->buffer_size;
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#ifdef Libisofs_with_zliB
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ret = compress2((Bytef *) rng->block_buffer, &buf_len,
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(Bytef *) rng->read_buffer, (uLong) ret, 9);
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if (ret != Z_OK) {
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#else
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{
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#endif
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/* >>> compression failed */
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/* <<< need better error code */
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return ISO_FILE_READ_ERROR;
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}
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}
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rng->buffer_fill = buf_len;
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rng->buffer_rpos = 0;
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next_pt = data->block_pointers[rng->block_counter] + buf_len;
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/* >>> check for data->size overflow */;
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if (data->size >= 0 && next_pt > data->size) {
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/* >>> Compression yields more bytes than on first run */
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/* <<< need better error code */
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return ISO_FILE_READ_ERROR;
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}
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/* >>> record resp. check block pointer */;
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rng->block_counter++;
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if (data->block_pointers[rng->block_counter] > 0) {
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/* >>> check */;
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if (next_pt != data->block_pointers[rng->block_counter] ) {
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/* >>> block pointers mismatch , content has changed */
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/* <<< need better error code */
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return ISO_FILE_READ_ERROR;
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}
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} else {
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data->block_pointers[rng->block_counter] = next_pt;
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}
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} else if (ret == 0) {
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rng->state = 3;
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return fill;
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} else
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return ret;
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if (rng->buffer_fill == 0) {
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continue;
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}
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}
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if (rng->state == 3 && rng->buffer_rpos >= rng->buffer_fill) {
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return 0; /* EOF */
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}
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/* Transfer from rng->block_buffer to buf */
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todo = desired - fill;
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if (todo > rng->buffer_fill - rng->buffer_rpos)
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todo = rng->buffer_fill - rng->buffer_rpos;
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memcpy(cbuf + fill, rng->block_buffer + rng->buffer_rpos, todo);
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fill += todo;
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rng->buffer_rpos += todo;
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rng->out_counter += todo;
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if (fill >= desired) {
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return fill;
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}
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}
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return ISO_FILE_READ_ERROR; /* should never be hit */
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}
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static
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off_t ziso_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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ZisofsFilterStreamData *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 = ziso_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 = ziso_stream_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 = ziso_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 ziso_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 ziso_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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ZisofsFilterStreamData *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_ZISOFSL_DEV_ID;
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*ino_id = data->id;
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}
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static
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void ziso_stream_free(IsoStream *stream)
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{
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ZisofsFilterStreamData *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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ziso_stream_close(stream);
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}
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if (data->block_pointers != NULL) {
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free((char *) data->block_pointers);
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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 ziso_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
|
||||
IsoStream *ziso_get_input_stream(IsoStream *stream, int flag)
|
||||
{
|
||||
ZisofsFilterStreamData *data;
|
||||
|
||||
if (stream == NULL) {
|
||||
return NULL;
|
||||
}
|
||||
data = stream->data;
|
||||
return data->orig;
|
||||
}
|
||||
|
||||
|
||||
IsoStreamIface ziso_stream_class = {
|
||||
2,
|
||||
"ziso",
|
||||
ziso_stream_open,
|
||||
ziso_stream_close,
|
||||
ziso_stream_get_size,
|
||||
ziso_stream_read,
|
||||
ziso_stream_is_repeatable,
|
||||
ziso_stream_get_id,
|
||||
ziso_stream_free,
|
||||
ziso_update_size,
|
||||
ziso_get_input_stream
|
||||
};
|
||||
|
||||
|
||||
static
|
||||
void ziso_filter_free(FilterContext *filter)
|
||||
{
|
||||
/* no data are allocated */;
|
||||
}
|
||||
|
||||
|
||||
/* To be called by iso_file_add_filter().
|
||||
* The FilterContext input parameter is not furtherly needed for the
|
||||
* emerging IsoStream.
|
||||
*/
|
||||
static
|
||||
int ziso_filter_get_filter(FilterContext *filter, IsoStream *original,
|
||||
IsoStream **filtered)
|
||||
{
|
||||
IsoStream *str;
|
||||
ZisofsFilterStreamData *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(ZisofsFilterStreamData), 1);
|
||||
if (data == NULL) {
|
||||
free(str);
|
||||
return ISO_OUT_OF_MEM;
|
||||
}
|
||||
|
||||
/* These data items are not owned by this filter object */
|
||||
data->id = ++ziso_ino_id;
|
||||
data->orig = original;
|
||||
data->size = -1;
|
||||
data->orig_size = 0;
|
||||
data->block_pointers = NULL;
|
||||
data->running = NULL;
|
||||
|
||||
/* get reference to the source */
|
||||
iso_stream_ref(data->orig);
|
||||
|
||||
str->refcount = 1;
|
||||
str->data = data;
|
||||
str->class = &ziso_stream_class;
|
||||
|
||||
*filtered = str;
|
||||
|
||||
return ISO_SUCCESS;
|
||||
}
|
||||
|
||||
|
||||
/* 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 dows not carry individual data.
|
||||
*/
|
||||
static
|
||||
int ziso_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 = ziso_filter_free;
|
||||
f->get_filter = ziso_filter_get_filter;
|
||||
return ISO_SUCCESS;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* @param flag bit0= if_block_reduction rather than if_reduction
|
||||
* >>> bit1= Install a decompression filter
|
||||
*/
|
||||
int iso_file_add_zisofs_filter(IsoFile *file, int flag)
|
||||
{
|
||||
|
||||
#ifdef Libisofs_with_zliB
|
||||
|
||||
int ret;
|
||||
FilterContext *f = NULL;
|
||||
IsoStream *stream;
|
||||
off_t original_size = 0, filtered_size = 0;
|
||||
|
||||
original_size = iso_file_get_size(file);
|
||||
if (original_size <= 0) {
|
||||
return 2;
|
||||
}
|
||||
if (original_size > 4294967295.0) {
|
||||
return ISO_ZISOFS_TOO_LARGE;
|
||||
}
|
||||
|
||||
ret = ziso_create_context(&f, 0);
|
||||
if (ret < 0) {
|
||||
return ret;
|
||||
}
|
||||
ret = iso_file_add_filter(file, f, 0);
|
||||
free(f);
|
||||
if (ret < 0) {
|
||||
return ret;
|
||||
}
|
||||
/* 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){
|
||||
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 */
|
||||
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue