New API functions iso_file_add_gzip_filter() and iso_gzip_get_refcounts().
This commit is contained in:
@@ -45,6 +45,7 @@ libisofs_libisofs_la_SOURCES = \
|
||||
libisofs/filters/xor_encrypt.c \
|
||||
libisofs/filters/external.c \
|
||||
libisofs/filters/zisofs.c \
|
||||
libisofs/filters/gzip.c \
|
||||
libisofs/util.h \
|
||||
libisofs/util.c \
|
||||
libisofs/util_rbtree.c \
|
||||
|
||||
@@ -24,6 +24,9 @@
|
||||
/* libisofs/filters/zisofs.c */
|
||||
#define ISO_FILTER_ZISOFS_DEV_ID 3
|
||||
|
||||
/* libisofs/filters/gzip.c */
|
||||
#define ISO_FILTER_GZIP_DEV_ID 4
|
||||
|
||||
|
||||
typedef struct filter_context FilterContext;
|
||||
|
||||
|
||||
729
libisofs/filters/gzip.c
Normal file
729
libisofs/filters/gzip.c
Normal file
@@ -0,0 +1,729 @@
|
||||
/*
|
||||
* Copyright (c) 2009 Thomas Schmitt
|
||||
*
|
||||
* This file is part of the libisofs project; 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 COPYING file for details.
|
||||
*
|
||||
* It implements a filter facility which can pipe a IsoStream into gzip
|
||||
* compression resp. uncompression, read its output and forward it as IsoStream
|
||||
* output to an IsoFile.
|
||||
* The gzip compression is done via zlib by Jean-loup Gailly and Mark Adler
|
||||
* who state in <zlib.h>:
|
||||
* "The data format used by the zlib library is described by RFCs (Request for
|
||||
* Comments) 1950 to 1952 in the files http://www.ietf.org/rfc/rfc1950.txt
|
||||
* (zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format)."
|
||||
*
|
||||
*/
|
||||
|
||||
#include "../libisofs.h"
|
||||
#include "../filter.h"
|
||||
#include "../fsource.h"
|
||||
#include "../util.h"
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <sys/time.h>
|
||||
#include <sys/wait.h>
|
||||
#include <unistd.h>
|
||||
#include <stdio.h>
|
||||
#include <errno.h>
|
||||
#include <string.h>
|
||||
|
||||
#ifdef Libisofs_with_zliB
|
||||
#include <zlib.h>
|
||||
#else
|
||||
/* If zlib is not available then this code is a dummy */
|
||||
#endif
|
||||
|
||||
|
||||
/*
|
||||
* A filter that encodes or decodes the content of gzip compressed files.
|
||||
*/
|
||||
|
||||
|
||||
/* --------------------------- GzipFilterRuntime ------------------------- */
|
||||
|
||||
|
||||
/* Individual runtime properties exist only as long as the stream is opened.
|
||||
*/
|
||||
typedef struct
|
||||
{
|
||||
|
||||
#ifdef Libisofs_with_zliB
|
||||
|
||||
z_stream strm; /* The zlib processing context */
|
||||
|
||||
#endif
|
||||
|
||||
char *in_buffer;
|
||||
char *out_buffer;
|
||||
int in_buffer_size;
|
||||
int out_buffer_size;
|
||||
char *rpt; /* out_buffer + read_bytes */
|
||||
|
||||
off_t in_counter;
|
||||
off_t out_counter;
|
||||
|
||||
int do_flush; /* flush mode for deflate() changes at end of input */
|
||||
|
||||
int error_ret;
|
||||
|
||||
} GzipFilterRuntime;
|
||||
|
||||
|
||||
static
|
||||
int gzip_running_destroy(GzipFilterRuntime **running, int flag)
|
||||
{
|
||||
GzipFilterRuntime *o= *running;
|
||||
if (o == NULL)
|
||||
return 0;
|
||||
if (o->in_buffer != NULL)
|
||||
free(o->in_buffer);
|
||||
if (o->out_buffer != NULL)
|
||||
free(o->out_buffer);
|
||||
free((char *) o);
|
||||
*running = NULL;
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
static
|
||||
int gzip_running_new(GzipFilterRuntime **running, int flag)
|
||||
{
|
||||
GzipFilterRuntime *o;
|
||||
|
||||
*running = o = calloc(sizeof(GzipFilterRuntime), 1);
|
||||
if (o == NULL) {
|
||||
return ISO_OUT_OF_MEM;
|
||||
}
|
||||
#ifdef Libisofs_with_zliB
|
||||
memset(&(o->strm), 0, sizeof(o->strm));
|
||||
#endif
|
||||
o->in_buffer = NULL;
|
||||
o->out_buffer = NULL;
|
||||
o->in_buffer_size = 0;
|
||||
o->out_buffer_size = 0;
|
||||
o->rpt = NULL;
|
||||
o->in_counter = 0;
|
||||
o->out_counter = 0;
|
||||
#ifdef Libisofs_with_zliB
|
||||
o->do_flush = Z_NO_FLUSH;
|
||||
#endif
|
||||
o->error_ret = 1;
|
||||
|
||||
o->in_buffer_size= 2048;
|
||||
o->out_buffer_size= 2048;
|
||||
o->in_buffer = calloc(o->in_buffer_size, 1);
|
||||
o->out_buffer = calloc(o->out_buffer_size, 1);
|
||||
if (o->in_buffer == NULL || o->out_buffer == NULL)
|
||||
goto failed;
|
||||
o->rpt = o->out_buffer;
|
||||
return 1;
|
||||
failed:
|
||||
gzip_running_destroy(running, 0);
|
||||
return -1;
|
||||
}
|
||||
|
||||
|
||||
/* ---------------------------- GzipFilterStreamData --------------------- */
|
||||
|
||||
|
||||
/* Counts the number of active compression filters */
|
||||
static off_t gzip_ref_count = 0;
|
||||
|
||||
/* Counts the number of active uncompression filters */
|
||||
static off_t gunzip_ref_count = 0;
|
||||
|
||||
|
||||
#ifdef Libisofs_with_zliB
|
||||
/* Parameter for deflateInit2() , see <zlib.h> */
|
||||
|
||||
/* >>> ??? get this from zisofs.c ziso_compression_level ? */
|
||||
static int gzip_compression_level = 6;
|
||||
|
||||
#endif /* Libisofs_with_zliB */
|
||||
|
||||
|
||||
/*
|
||||
* The data payload of an individual Gzip Filter IsoStream
|
||||
*/
|
||||
typedef struct
|
||||
{
|
||||
IsoStream *orig;
|
||||
|
||||
off_t size; /* -1 means that the size is unknown yet */
|
||||
|
||||
GzipFilterRuntime *running; /* is non-NULL when open */
|
||||
|
||||
ino_t id;
|
||||
|
||||
} GzipFilterStreamData;
|
||||
|
||||
|
||||
|
||||
/* Each individual GzipFilterStreamData needs a unique id number. */
|
||||
/* >>> This is very suboptimal:
|
||||
The counter can rollover.
|
||||
*/
|
||||
static ino_t gzip_ino_id = 0;
|
||||
|
||||
static
|
||||
int gzip_stream_uncompress(IsoStream *stream, void *buf, size_t desired);
|
||||
|
||||
|
||||
/*
|
||||
* Methods for the IsoStreamIface of a Gzip Filter object.
|
||||
*/
|
||||
|
||||
/*
|
||||
* @param flag bit0= original stream is not open
|
||||
*/
|
||||
static
|
||||
int gzip_stream_close_flag(IsoStream *stream, int flag)
|
||||
{
|
||||
|
||||
#ifdef Libisofs_with_zliB
|
||||
|
||||
GzipFilterStreamData *data;
|
||||
|
||||
if (stream == NULL) {
|
||||
return ISO_NULL_POINTER;
|
||||
}
|
||||
data = stream->data;
|
||||
|
||||
if (data->running == NULL) {
|
||||
return 1;
|
||||
}
|
||||
if (stream->class->read == &gzip_stream_uncompress) {
|
||||
inflateEnd(&(data->running->strm));
|
||||
} else {
|
||||
deflateEnd(&(data->running->strm));
|
||||
}
|
||||
gzip_running_destroy(&(data->running), 0);
|
||||
|
||||
if (flag & 1)
|
||||
return 1;
|
||||
return iso_stream_close(data->orig);
|
||||
|
||||
#else
|
||||
|
||||
return ISO_ZLIB_NOT_ENABLED;
|
||||
|
||||
#endif
|
||||
|
||||
}
|
||||
|
||||
|
||||
static
|
||||
int gzip_stream_close(IsoStream *stream)
|
||||
{
|
||||
return gzip_stream_close_flag(stream, 0);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* @param flag bit0= do not run .get_size() if size is < 0
|
||||
*/
|
||||
static
|
||||
int gzip_stream_open_flag(IsoStream *stream, int flag)
|
||||
{
|
||||
|
||||
#ifdef Libisofs_with_zliB
|
||||
|
||||
GzipFilterStreamData *data;
|
||||
GzipFilterRuntime *running = NULL;
|
||||
int ret;
|
||||
z_stream *strm;
|
||||
|
||||
if (stream == NULL) {
|
||||
return ISO_NULL_POINTER;
|
||||
}
|
||||
data = (GzipFilterStreamData*) stream->data;
|
||||
if (data->running != NULL) {
|
||||
return ISO_FILE_ALREADY_OPENED;
|
||||
}
|
||||
if (data->size < 0 && !(flag & 1)) {
|
||||
/* Do the size determination run now, so that the size gets cached
|
||||
and .get_size() will not fail on an opened stream.
|
||||
*/
|
||||
stream->class->get_size(stream);
|
||||
}
|
||||
|
||||
ret = gzip_running_new(&running,
|
||||
stream->class->read == &gzip_stream_uncompress);
|
||||
if (ret < 0) {
|
||||
return ret;
|
||||
}
|
||||
data->running = running;
|
||||
|
||||
/* Start up zlib compression context */
|
||||
strm = &(running->strm);
|
||||
strm->zalloc = Z_NULL;
|
||||
strm->zfree = Z_NULL;
|
||||
strm->opaque = Z_NULL;
|
||||
if (stream->class->read == &gzip_stream_uncompress) {
|
||||
ret = inflateInit2(strm, 15 | 16);
|
||||
} else {
|
||||
ret = deflateInit2(strm, gzip_compression_level, Z_DEFLATED,
|
||||
15 | 16, 8, Z_DEFAULT_STRATEGY);
|
||||
}
|
||||
if (ret != Z_OK)
|
||||
return ISO_ZLIB_COMPR_ERR;
|
||||
strm->next_out = (Bytef *) running->out_buffer;
|
||||
strm->avail_out = running->out_buffer_size;
|
||||
|
||||
/* Open input stream */
|
||||
ret = iso_stream_open(data->orig);
|
||||
if (ret < 0) {
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 1;
|
||||
|
||||
#else
|
||||
|
||||
return ISO_ZLIB_NOT_ENABLED;
|
||||
|
||||
#endif
|
||||
|
||||
}
|
||||
|
||||
|
||||
static
|
||||
int gzip_stream_open(IsoStream *stream)
|
||||
{
|
||||
return gzip_stream_open_flag(stream, 0);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* @param flag bit1= uncompress rather than compress
|
||||
*/
|
||||
static
|
||||
int gzip_stream_convert(IsoStream *stream, void *buf, size_t desired, int flag)
|
||||
{
|
||||
|
||||
#ifdef Libisofs_with_zliB
|
||||
|
||||
int ret, todo, cnv_ret, c_bytes;
|
||||
GzipFilterStreamData *data;
|
||||
GzipFilterRuntime *rng;
|
||||
size_t fill = 0;
|
||||
z_stream *strm;
|
||||
|
||||
if (stream == NULL) {
|
||||
return ISO_NULL_POINTER;
|
||||
}
|
||||
data = stream->data;
|
||||
rng= data->running;
|
||||
if (rng == NULL) {
|
||||
return ISO_FILE_NOT_OPENED;
|
||||
}
|
||||
strm = &(rng->strm);
|
||||
if (rng->error_ret < 0) {
|
||||
return rng->error_ret;
|
||||
} else if (rng->error_ret == 0) {
|
||||
if (rng->out_buffer_size - strm->avail_out
|
||||
- (rng->rpt - rng->out_buffer) <= 0)
|
||||
return 0;
|
||||
}
|
||||
|
||||
while (1) {
|
||||
|
||||
/* Transfer eventual converted bytes from strm to buf */
|
||||
c_bytes = rng->out_buffer_size - strm->avail_out
|
||||
- (rng->rpt - rng->out_buffer);
|
||||
if (c_bytes > 0) {
|
||||
todo = desired - fill;
|
||||
if (todo > c_bytes)
|
||||
todo = c_bytes;
|
||||
memcpy(((char *) buf) + fill, rng->rpt, todo);
|
||||
rng->rpt += todo;
|
||||
fill += todo;
|
||||
rng->out_counter += todo;
|
||||
}
|
||||
|
||||
if (fill >= desired || rng->error_ret == 0)
|
||||
return fill;
|
||||
|
||||
/* All buffered out data are consumed now */
|
||||
rng->rpt = rng->out_buffer;
|
||||
strm->next_out = (Bytef *) rng->out_buffer;
|
||||
strm->avail_out = rng->out_buffer_size;
|
||||
|
||||
if (strm->avail_in == 0) {
|
||||
/* All pending input is consumed. Get new input. */
|
||||
ret = iso_stream_read(data->orig, rng->in_buffer,
|
||||
rng->in_buffer_size);
|
||||
if (ret < 0)
|
||||
return (rng->error_ret = ret);
|
||||
if (ret == 0) {
|
||||
if (flag & 2) {
|
||||
|
||||
/* >>> ??? what to do on (early) input EOF ? */;
|
||||
return (rng->error_ret = ISO_ZLIB_COMPR_ERR);
|
||||
|
||||
} else {
|
||||
/* Tell zlib by the next call that it is over */
|
||||
rng->do_flush = Z_FINISH;
|
||||
}
|
||||
}
|
||||
strm->next_in = (Bytef *) rng->in_buffer;
|
||||
strm->avail_in = ret;
|
||||
rng->in_counter += ret;
|
||||
}
|
||||
|
||||
/* Submit input and fetch output until input is consumed */
|
||||
while (1) {
|
||||
if (flag & 2) {
|
||||
cnv_ret = inflate(strm, rng->do_flush);
|
||||
} else {
|
||||
cnv_ret = deflate(strm, rng->do_flush);
|
||||
}
|
||||
if (cnv_ret == Z_STREAM_ERROR || cnv_ret == Z_BUF_ERROR) {
|
||||
return (rng->error_ret = ISO_ZLIB_COMPR_ERR);
|
||||
}
|
||||
if (strm->avail_out < rng->out_buffer_size)
|
||||
break; /* output is available */
|
||||
if (strm->avail_in == 0) /* all pending input consumed */
|
||||
break;
|
||||
}
|
||||
if (cnv_ret == Z_STREAM_END)
|
||||
rng->error_ret = 0;
|
||||
}
|
||||
return fill;
|
||||
|
||||
#else
|
||||
|
||||
return ISO_ZLIB_NOT_ENABLED;
|
||||
|
||||
#endif
|
||||
|
||||
}
|
||||
|
||||
static
|
||||
int gzip_stream_compress(IsoStream *stream, void *buf, size_t desired)
|
||||
{
|
||||
return gzip_stream_convert(stream, buf, desired, 0);
|
||||
}
|
||||
|
||||
static
|
||||
int gzip_stream_uncompress(IsoStream *stream, void *buf, size_t desired)
|
||||
{
|
||||
return gzip_stream_convert(stream, buf, desired, 2);
|
||||
}
|
||||
|
||||
|
||||
static
|
||||
off_t gzip_stream_get_size(IsoStream *stream)
|
||||
{
|
||||
int ret, ret_close;
|
||||
off_t count = 0;
|
||||
GzipFilterStreamData *data;
|
||||
char buf[64 * 1024];
|
||||
size_t bufsize = 64 * 1024;
|
||||
|
||||
if (stream == NULL) {
|
||||
return ISO_NULL_POINTER;
|
||||
}
|
||||
data = stream->data;
|
||||
|
||||
if (data->size >= 0) {
|
||||
return data->size;
|
||||
}
|
||||
|
||||
/* Run filter command and count output bytes */
|
||||
ret = gzip_stream_open_flag(stream, 1);
|
||||
if (ret < 0) {
|
||||
return ret;
|
||||
}
|
||||
while (1) {
|
||||
ret = stream->class->read(stream, buf, bufsize);
|
||||
if (ret <= 0)
|
||||
break;
|
||||
count += ret;
|
||||
}
|
||||
ret_close = gzip_stream_close(stream);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
if (ret_close < 0)
|
||||
return ret_close;
|
||||
|
||||
data->size = count;
|
||||
return count;
|
||||
}
|
||||
|
||||
|
||||
static
|
||||
int gzip_stream_is_repeatable(IsoStream *stream)
|
||||
{
|
||||
/* Only repeatable streams are accepted as orig */
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
static
|
||||
void gzip_stream_get_id(IsoStream *stream, unsigned int *fs_id,
|
||||
dev_t *dev_id, ino_t *ino_id)
|
||||
{
|
||||
GzipFilterStreamData *data;
|
||||
|
||||
data = stream->data;
|
||||
*fs_id = ISO_FILTER_FS_ID;
|
||||
*dev_id = ISO_FILTER_GZIP_DEV_ID;
|
||||
*ino_id = data->id;
|
||||
}
|
||||
|
||||
|
||||
static
|
||||
void gzip_stream_free(IsoStream *stream)
|
||||
{
|
||||
GzipFilterStreamData *data;
|
||||
|
||||
if (stream == NULL) {
|
||||
return;
|
||||
}
|
||||
data = stream->data;
|
||||
if (data->running != NULL) {
|
||||
gzip_stream_close(stream);
|
||||
}
|
||||
if (stream->class->read == &gzip_stream_uncompress) {
|
||||
if (--gunzip_ref_count < 0)
|
||||
gunzip_ref_count = 0;
|
||||
} else {
|
||||
if (--gzip_ref_count < 0)
|
||||
gzip_ref_count = 0;
|
||||
}
|
||||
iso_stream_unref(data->orig);
|
||||
free(data);
|
||||
}
|
||||
|
||||
|
||||
static
|
||||
int gzip_update_size(IsoStream *stream)
|
||||
{
|
||||
/* By principle size is determined only once */
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
static
|
||||
IsoStream *gzip_get_input_stream(IsoStream *stream, int flag)
|
||||
{
|
||||
GzipFilterStreamData *data;
|
||||
|
||||
if (stream == NULL) {
|
||||
return NULL;
|
||||
}
|
||||
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
|
||||
|
||||
Reference in New Issue
Block a user