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/*
* Copyright (c) 2009 - 2020 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
* or later as published by the Free Software Foundation.
* See COPYING file for details.
*
* It implements a filter facility which can pipe a IsoStream into zisofs
* compression resp. uncompression, read its output and forward it as IsoStream
* output to an IsoFile.
* The zisofs format was invented by H. Peter Anvin. See doc/zisofs_format.txt
* It is writeable and readable by zisofs-tools, readable by Linux kernels.
*
*/
#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif
#include "../libisofs.h"
#include "../filter.h"
#include "../fsource.h"
#include "../util.h"
#include "../stream.h"
#include "../messages.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 zisofs compressed files.
*/
/* The lowest size of a file which shall not be represented by zisofs v1 */
#define ISO_ZISOFS_V1_LIMIT 4294967296
/* zisofs2: Test value for small mixed-version ISOs: 1 million
ISO_ZISOFS_V1_LIMIT 1000000
*/
/* Minimum and maximum blocks sizes for version 1 and 2 */
#define ISO_ZISOFS_V1_MIN_LOG2 15
#define ISO_ZISOFS_V1_MAX_LOG2 17
#define ISO_ZISOFS_V2_MIN_LOG2 15
#define ISO_ZISOFS_V2_MAX_LOG2 20
/* ------------------- Defaults of runtime parameters ------------------ */
/* Limit for overall count of allocated block pointers:
2 exp 25 = 256 MiB blocklist buffer = 4 TiB uncompressed at 128 KiB
*/
#define ISO_ZISOFS_MAX_BLOCKS_T 0x2000000
/* Function to account for global block pointers */
static uint64_t ziso_block_pointer_mgt(uint64_t num, int mode);
/* Limit for single files:
2 exp 25 = 256 MiB blocklist buffer = 4 TiB uncompressed at 128 KiB
*/
#define ISO_ZISOFS_MAX_BLOCKS_F 0x2000000
/* The number of blocks from which on the block pointer list shall be discarded
* on iso_stream_close() of a compressing stream. This means that the pointers
* have to be determined again on next ziso_stream_compress(), so that adding
* a zisofs compression filter and writing the compressed stream needs in the
* sum three read runs of the input stream.
* <= 0 disables this file size based discarding.
*/
#define ISO_ZISOFS_MANY_BLOCKS 0
/* A ratio describing the part of the maximum number of block pointers which
* shall be kept free by intermediate discarding of block pointers. See above
* ISO_ZISOFS_MANY_BLOCKS. -1.0 disables this feature.
*/
#define ISO_ZISOFS_KBF_RATIO -1.0
/* --------------------------- Runtime parameters ------------------------- */
/* Sizes to be used for compression. Decompression learns from input header. */
static uint8_t ziso_block_size_log2 = 15;
static int ziso_v2_enabled = 0;
static int ziso_v2_block_size_log2 = 17;
static int64_t ziso_block_number_target = -1;
static int64_t ziso_max_total_blocks = ISO_ZISOFS_MAX_BLOCKS_T;
static int64_t ziso_max_file_blocks = ISO_ZISOFS_MAX_BLOCKS_F;
static int64_t ziso_many_block_limit = ISO_ZISOFS_MANY_BLOCKS;
static double ziso_keep_blocks_free_ratio = ISO_ZISOFS_KBF_RATIO;
/* Discard block pointers on last stream close even if the size constraints
* are not met. To be set to 1 at block pointer overflow. To be set to 0
* when all compression filters are deleted.
*/
static int ziso_early_bpt_discard = 0;
/* 1 = produce Z2 entries for zisofs2 , 0 = produce ZF for zisofs2
* This is used as extern variable in rockridge.c
*/
int iso_zisofs2_enable_susp_z2 = 0;
static
int ziso_decide_v2_usage(off_t orig_size)
{
if (ziso_v2_enabled > 1 ||
(ziso_v2_enabled == 1 && orig_size >= (off_t) ISO_ZISOFS_V1_LIMIT))
return 1;
return 0;
}
static
int ziso_decide_bs_log2(off_t orig_size)
{
int bs_log2, bs_log2_min, i;
off_t bs;
if (ziso_decide_v2_usage(orig_size)) {
bs_log2 = ziso_v2_block_size_log2;
bs_log2_min = ISO_ZISOFS_V2_MIN_LOG2;
} else {
bs_log2 = ziso_block_size_log2;
bs_log2_min = ISO_ZISOFS_V1_MIN_LOG2;
}
if (ziso_block_number_target <= 0)
return bs_log2;
for (i = bs_log2_min; i < bs_log2; i++) {
bs = (1 << i);
if (orig_size / bs + !!(orig_size % bs) + 1 <=
ziso_block_number_target)
return i;
}
return bs_log2;
}
/* --------------------------- ZisofsFilterRuntime ------------------------- */
/* Individual runtime properties exist only as long as the stream is opened.
*/
typedef struct
{
int state; /* processing: 0= header, 1= block pointers, 2= data blocks */
int zisofs_version; /* 1 or 2 */
int block_size;
int64_t block_pointer_fill;
int64_t block_pointer_rpos;
uint64_t *block_pointers; /* These are in use only with uncompression.
Compression streams hold the pointer in
their persistent data.
*/
char *read_buffer;
char *block_buffer;
int buffer_size;
int buffer_fill;
int buffer_rpos;
off_t block_counter;
off_t in_counter;
off_t out_counter;
int error_ret;
} ZisofsFilterRuntime;
static
int ziso_running_destroy(ZisofsFilterRuntime **running, int flag)
{
ZisofsFilterRuntime *o= *running;
if (o == NULL)
return 0;
if (o->block_pointers != NULL) {
ziso_block_pointer_mgt((uint64_t) o->block_pointer_fill, 2);
free(o->block_pointers);
}
if (o->read_buffer != NULL)
free(o->read_buffer);
if (o->block_buffer != NULL)
free(o->block_buffer);
free((char *) o);
*running = NULL;
return 1;
}
/*
* @param flag bit0= do not set block_size, do not allocate buffers
*/
static
int ziso_running_new(ZisofsFilterRuntime **running, off_t orig_size,
int flag)
{
ZisofsFilterRuntime *o;
*running = o = calloc(sizeof(ZisofsFilterRuntime), 1);
if (o == NULL) {
return ISO_OUT_OF_MEM;
}
o->state = 0;
o->block_size= 0;
o->zisofs_version = 0;
o->block_pointer_fill = 0;
o->block_pointer_rpos = 0;
o->block_pointers = NULL;
o->read_buffer = NULL;
o->block_buffer = NULL;
o->buffer_size = 0;
o->buffer_fill = 0;
o->buffer_rpos = 0;
o->block_counter = 0;
o->in_counter = 0;
o->out_counter = 0;
o->error_ret = 0;
if (flag & 1)
return 1;
o->block_size = (1 << ziso_decide_bs_log2(orig_size));
#ifdef Libisofs_with_zliB
o->buffer_size = compressBound((uLong) o->block_size);
#else
o->buffer_size = 2 * o->block_size;
#endif
o->read_buffer = calloc(o->block_size, 1);
o->block_buffer = calloc(o->buffer_size, 1);
if (o->block_buffer == NULL || o->read_buffer == NULL)
goto failed;
return 1;
failed:
ziso_running_destroy(running, 0);
return -1;
}
/* --------------------------- Resource accounting ------------------------- */
/* @param mode 0= inquire whether num block pointers would fit
1= register num block pointers
2= unregister num block_pointers
3= return number of accounted block pointers
@return if not mode 3: 0= does not fit , 1= fits
*/
static
uint64_t ziso_block_pointer_mgt(uint64_t num, int mode)
{
static uint64_t global_count = 0;
static int underrun = 0;
if (mode == 2) {
if (global_count < num) {
if (underrun < 3)
iso_msg_submit(-1, ISO_ZISOFS_BPT_UNDERRUN, 0,
"Prevented global block pointer counter underrun");
underrun++;
global_count = 0;
} else {
global_count -= num;
}
} else if (mode == 3) {
return global_count;
} else {
if (global_count + num > (uint64_t) ziso_max_total_blocks)
return 0;
if (mode == 1)
global_count += num;
}
return 1;
}
/* ---------------------------- ZisofsFilterStreamData --------------------- */
/* The first 8 bytes of a zisofs compressed data file */
static unsigned char zisofs_magic[9] =
{0x37, 0xE4, 0x53, 0x96, 0xC9, 0xDB, 0xD6, 0x07};
/* The first 8 bytes of a zisofs2 compressed data file */
static unsigned char zisofs2_magic[9] =
{0xEF, 0x22, 0x55, 0xA1, 0xBC, 0x1B, 0x95, 0xA0};
/* Counts the number of active compression filters */
static off_t ziso_ref_count = 0;
/* Counts the number of active uncompression filters */
static off_t ziso_osiz_ref_count = 0;
#ifdef Libisofs_with_zliB
/* Parameter for compress2() , see <zlib.h> */
static int ziso_compression_level = 6;
#endif /* Libisofs_with_zliB */
/*
* The common data payload of an individual Zisofs Filter IsoStream
* IMPORTANT: Any change must be reflected by ziso_clone_stream().
*/
typedef struct
{
IsoStream *orig;
off_t size; /* -1 means that the size is unknown yet */
ZisofsFilterRuntime *running; /* is non-NULL when open */
ino_t id;
} ZisofsFilterStreamData;
/*
* The data payload of an individual Zisofs Filter Compressor IsoStream
* IMPORTANT: Any change must be reflected by ziso_clone_stream().
*/
typedef struct
{
ZisofsFilterStreamData std;
uint64_t orig_size;
uint64_t *block_pointers; /* Cache for output block addresses. They get
written before the data and so need 2 passes.
This cache avoids surplus passes.
*/
uint64_t block_pointer_counter;
uint64_t open_counter;
int block_pointers_dropped;
} ZisofsComprStreamData;
/*
* The data payload of an individual Zisofs Filter Uncompressor IsoStream
* IMPORTANT: Any change must be reflected by ziso_clone_stream().
*/
typedef struct
{
ZisofsFilterStreamData std;
uint8_t zisofs_algo_num;
unsigned char header_size_div4;
unsigned char block_size_log2;
} ZisofsUncomprStreamData;
/* Each individual ZisofsFilterStreamData needs a unique id number. */
/* >>> This is very suboptimal:
The counter can rollover.
*/
static ino_t ziso_ino_id = 0;
/*
* Methods for the IsoStreamIface of an Zisofs Filter object.
*/
static
int ziso_stream_uncompress(IsoStream *stream, void *buf, size_t desired);
static
int ziso_stream_compress(IsoStream *stream, void *buf, size_t desired);
/*
* @param flag bit0= discard even if the size conditions are not met
bit1= check for open_counter == 1 rather than == 0
*/
static
int ziso_discard_bpt(IsoStream *stream, int flag)
{
ZisofsFilterStreamData *data;
ZisofsComprStreamData *cstd = NULL;
int block_size;
double max_blocks, free_blocks;
data = stream->data;
if (stream->class->read == &ziso_stream_compress)
cstd = (ZisofsComprStreamData *) data;
if (cstd == NULL)
return 0;
block_size = (1 << ziso_decide_bs_log2(cstd->orig_size));
max_blocks = ziso_max_file_blocks;
if (max_blocks < 1.0)
max_blocks = 1.0;
free_blocks = ziso_max_total_blocks -
ziso_block_pointer_mgt((uint64_t) 0, 3);
if (cstd->block_pointers == NULL) {
return 0;
} else if (cstd->open_counter != !!(flag & 2)) {
return 0;
} else if (!((flag & 1) || ziso_early_bpt_discard)) {
if (ziso_many_block_limit <= 0 ||
cstd->orig_size / block_size + !!(cstd->orig_size % block_size)
+ 1 < (uint64_t) ziso_many_block_limit)
if (ziso_keep_blocks_free_ratio < 0.0 ||
free_blocks / max_blocks >= ziso_keep_blocks_free_ratio)
return 0;
}
ziso_block_pointer_mgt(cstd->block_pointer_counter, 2);
free((char *) cstd->block_pointers);
cstd->block_pointers_dropped = 1;
cstd->block_pointers = NULL;
cstd->block_pointer_counter = 0;
return 1;
}
/*
* @param flag bit0= original stream is not open
* bit1= do not destroy large
* ZisofsComprStreamData->block_pointers
*/
static
int ziso_stream_close_flag(IsoStream *stream, int flag)
{
ZisofsFilterStreamData *data;
ZisofsComprStreamData *cstd = NULL;
if (stream == NULL) {
return ISO_NULL_POINTER;
}
data = stream->data;
if (stream->class->read == &ziso_stream_compress)
cstd = (ZisofsComprStreamData *) data;
if (cstd != NULL && !(flag & 2))
ziso_discard_bpt(stream, 2);
if (data->running == NULL) {
return 1;
}
ziso_running_destroy(&(data->running), 0);
if (flag & 1)
return 1;
if (cstd != NULL)
if (cstd->open_counter > 0)
cstd->open_counter--;
return iso_stream_close(data->orig);
}
static
int ziso_stream_close(IsoStream *stream)
{
return ziso_stream_close_flag(stream, 0);
}
/*
* @param flag bit0= do not run .get_size() if size is < 0
*/
static
int ziso_stream_open_flag(IsoStream *stream, int flag)
{
ZisofsFilterStreamData *data;
ZisofsComprStreamData *cstd;
ZisofsFilterRuntime *running = NULL;
int ret;
off_t orig_size = 0;
if (stream == NULL) {
return ISO_NULL_POINTER;
}
data = (ZisofsFilterStreamData*) 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);
}
orig_size = data->size;
if (stream->class->read == &ziso_stream_compress) {
cstd = (ZisofsComprStreamData *) data;
cstd->open_counter++;
orig_size = cstd->orig_size;
}
if (orig_size < 0)
return ISO_ZISOFS_UNKNOWN_SIZE;
ret = ziso_running_new(&running, orig_size,
(stream->class->read == &ziso_stream_uncompress));
if (ret < 0) {
return ret;
}
data->running = running;
ret = iso_stream_open(data->orig);
if (ret < 0) {
return ret;
}
return 1;
}
static
int ziso_stream_open(IsoStream *stream)
{
return ziso_stream_open_flag(stream, 0);
}
/* @param flag bit0= stream is already open
bit1= close stream with flag bit1
*/
static
off_t ziso_stream_measure_size(IsoStream *stream, int flag)
{
int ret, ret_close;
off_t count = 0;
ZisofsFilterStreamData *data;
char buf[64 * 1024];
size_t bufsize = 64 * 1024;
if (stream == NULL)
return ISO_NULL_POINTER;
data = stream->data;
/* Run filter command and count output bytes */
if (!(flag & 1)) {
ret = ziso_stream_open_flag(stream, 1);
if (ret < 0)
return ret;
}
if (stream->class->read == &ziso_stream_uncompress) {
/* It is enough to read the header part of a compressed file */
ret = ziso_stream_uncompress(stream, buf, 0);
count = data->size;
} else {
/* The size of the compression result has to be counted */
while (1) {
ret = stream->class->read(stream, buf, bufsize);
if (ret <= 0)
break;
count += ret;
}
}
ret_close = ziso_stream_close_flag(stream, flag & 2);
if (ret < 0)
return ret;
if (ret_close < 0)
return ret_close;
data->size = count;
return count;
}
static
int ziso_stream_compress(IsoStream *stream, void *buf, size_t desired)
{
#ifdef Libisofs_with_zliB
int ret, todo, i;
ZisofsComprStreamData *data;
ZisofsFilterRuntime *rng;
size_t fill = 0;
off_t orig_size, next_pt, measure_ret;
char *cbuf = buf;
uLongf buf_len;
uint64_t *copy_base, num_blocks = 0;
if (stream == NULL) {
return ISO_NULL_POINTER;
}
data = stream->data;
rng= data->std.running;
if (rng == NULL) {
return ISO_FILE_NOT_OPENED;
}
if (rng->error_ret < 0) {
return rng->error_ret;
}
if (data->block_pointers_dropped) {
/* The list was dropped after measurement of compressed size. But this
* run of the function expects it as already filled with pointer
* values. So now they have to be re-computed by extra runs of this
* function in the course of compressed size measurement.
*/
data->block_pointers_dropped = 0;
measure_ret = ziso_stream_measure_size(stream, 1 | 2);
if (measure_ret < 0)
return (rng->error_ret = measure_ret);
/* Stream was closed. Open it again, without any size determination. */
ret = ziso_stream_open_flag(stream, 1);
if (ret < 0)
return ret;
}
while (1) {
if (rng->state == 0) {
/* Delivering file header */
if (rng->buffer_fill == 0) {
orig_size = iso_stream_get_size(data->std.orig);
num_blocks = orig_size / rng->block_size +
1 + !!(orig_size % rng->block_size);
if (num_blocks > (uint64_t) ziso_max_file_blocks)
return (rng->error_ret = ISO_ZISOFS_TOO_LARGE);
if (ziso_block_pointer_mgt((uint64_t) num_blocks, 0) == 0) {
ziso_early_bpt_discard = 1;
return (rng->error_ret = ISO_ZISOFS_TOO_MANY_PTR);
}
if (orig_size != (off_t) data->orig_size)
return (rng->error_ret = ISO_FILTER_WRONG_INPUT);
if (ziso_decide_v2_usage(orig_size)) {
rng->zisofs_version = 2;
memcpy(rng->block_buffer, zisofs2_magic, 8);
rng->block_buffer[8] = 0; /* @hdr_version */
rng->block_buffer[9] = 6; /* @hdr_size */
rng->block_buffer[10] = 1; /* @alg_id */
rng->block_buffer[11] = ziso_decide_bs_log2(orig_size);
iso_lsb64((uint8_t *) (rng->block_buffer + 12),
(uint64_t) orig_size);
memset(rng->block_buffer + 20, 0, 4);
rng->buffer_fill = 24;
} else {
if (orig_size >= (off_t) ISO_ZISOFS_V1_LIMIT) {
return (rng->error_ret = ISO_ZISOFS_TOO_LARGE);
}
rng->zisofs_version = 1;
memcpy(rng->block_buffer, zisofs_magic, 8);
iso_lsb((unsigned char *) (rng->block_buffer + 8),
(uint32_t) orig_size, 4);
rng->block_buffer[12] = 4;
rng->block_buffer[13] = ziso_decide_bs_log2(orig_size);
rng->block_buffer[14] = rng->block_buffer[15] = 0;
rng->buffer_fill = 16;
}
rng->buffer_rpos = 0;
} else if (rng->buffer_rpos >= rng->buffer_fill) {
rng->buffer_fill = rng->buffer_rpos = 0;
rng->state = 1; /* header is delivered */
}
}
if (rng->state == 1) {
/* Delivering block pointers */;
if (rng->block_pointer_fill == 0 || data->block_pointers == NULL) {
/* Initialize block pointer writing */
rng->block_pointer_rpos = 0;
num_blocks = data->orig_size / rng->block_size
+ 1 + !!(data->orig_size % rng->block_size);
if (rng->block_pointer_fill > 0 &&
(int64_t) num_blocks != rng->block_pointer_fill)
return (rng->error_ret = ISO_FILTER_WRONG_INPUT);
rng->block_pointer_fill = num_blocks;
if (data->block_pointers == NULL) {
/* On the first pass, create pointer array with all 0s */
if (ziso_block_pointer_mgt(num_blocks, 1) == 0) {
rng->block_pointer_fill = 0;
ziso_early_bpt_discard = 1;
return (rng->error_ret = ISO_ZISOFS_TOO_MANY_PTR);
}
data->block_pointers = calloc(rng->block_pointer_fill, 8);
if (data->block_pointers == NULL) {
ziso_block_pointer_mgt(num_blocks, 2);
rng->block_pointer_fill = 0;
return (rng->error_ret = ISO_OUT_OF_MEM);
}
data->block_pointer_counter = rng->block_pointer_fill;
}
}
if (rng->buffer_rpos >= rng->buffer_fill) {
if (rng->block_pointer_rpos >= rng->block_pointer_fill) {
rng->buffer_fill = rng->buffer_rpos = 0;
rng->block_counter = 0;
if (rng->zisofs_version == 1)
data->block_pointers[0] = 16 +
rng->block_pointer_fill * 4;
else
data->block_pointers[0] = 24 +
rng->block_pointer_fill * 8;
rng->state = 2; /* block pointers are delivered */
} else {
/* Provide a buffer full of block pointers */
/* data->block_pointers was filled by ziso_stream_open() */
todo = rng->block_pointer_fill - rng->block_pointer_rpos;
copy_base = data->block_pointers + rng->block_pointer_rpos;
if (rng->zisofs_version == 1) {
if (todo * 4 > rng->buffer_size)
todo = rng->buffer_size / 4;
for (i = 0; i < todo; i++)
iso_lsb((unsigned char *) (rng->block_buffer +
4 * i),
(uint32_t) (copy_base[i] & 0xffffffff), 4);
rng->buffer_fill = todo * 4;
} else {
if (todo * 8 > rng->buffer_size)
todo = rng->buffer_size / 8;
for (i = 0; i < todo; i++)
iso_lsb64((uint8_t *) rng->block_buffer + 8 * i,
copy_base[i]);
rng->buffer_fill = todo * 8;
}
rng->buffer_rpos = 0;
rng->block_pointer_rpos += todo;
}
}
}
if (rng->state == 2 && rng->buffer_rpos >= rng->buffer_fill) {
/* Delivering data blocks */;
ret = iso_stream_read(data->std.orig, rng->read_buffer,
rng->block_size);
if (ret > 0) {
rng->in_counter += ret;
if ((uint64_t) rng->in_counter > data->orig_size) {
/* Input size became larger */
return (rng->error_ret = ISO_FILTER_WRONG_INPUT);
}
/* Check whether all 0 : represent as 0-length block */;
for (i = 0; i < ret; i++)
if (rng->read_buffer[i])
break;
if (i >= ret) { /* All 0-bytes. Bypass compression. */
buf_len = 0;
} else {
buf_len = rng->buffer_size;
ret = compress2((Bytef *) rng->block_buffer, &buf_len,
(Bytef *) rng->read_buffer, (uLong) ret,
ziso_compression_level);
if (ret != Z_OK) {
return (rng->error_ret = ISO_ZLIB_COMPR_ERR);
}
}
rng->buffer_fill = buf_len;
rng->buffer_rpos = 0;
next_pt = data->block_pointers[rng->block_counter] + buf_len;
if (data->std.size >= 0 && next_pt > data->std.size) {
/* Compression yields more bytes than on first run */
return (rng->error_ret = ISO_FILTER_WRONG_INPUT);
}
/* Check or record check block pointer */
rng->block_counter++;
if (data->block_pointers[rng->block_counter] > 0) {
if ((uint64_t) next_pt !=
data->block_pointers[rng->block_counter]) {
/* block pointers mismatch , content has changed */
return (rng->error_ret = ISO_FILTER_WRONG_INPUT);
}
} else {
data->block_pointers[rng->block_counter] = next_pt;
}
} else if (ret == 0) {
rng->state = 3;
if ((uint64_t) rng->in_counter != data->orig_size) {
/* Input size shrunk */
return (rng->error_ret = ISO_FILTER_WRONG_INPUT);
}
return fill;
} else
return (rng->error_ret = ret);
if (rng->buffer_fill == 0) {
continue;
}
}
if (rng->state == 3 && rng->buffer_rpos >= rng->buffer_fill) {
return 0; /* EOF */
}
/* Transfer from rng->block_buffer to buf */
todo = desired - fill;
if (todo > rng->buffer_fill - rng->buffer_rpos)
todo = rng->buffer_fill - rng->buffer_rpos;
memcpy(cbuf + fill, rng->block_buffer + rng->buffer_rpos, todo);
fill += todo;
rng->buffer_rpos += todo;
rng->out_counter += todo;
if (fill >= desired) {
return fill;
}
}
return ISO_FILE_READ_ERROR; /* should never be hit */
#else
return ISO_ZLIB_NOT_ENABLED;
#endif
}
#ifdef Libisofs_with_zliB
static
int ziso_algo_to_num(uint8_t zisofs_algo[2])
{
if (zisofs_algo[0] == 'p' && zisofs_algo[1] == 'z')
return 0;
if (zisofs_algo[0] == 'P' && zisofs_algo[1] == 'Z')
return 1;
if (zisofs_algo[0] == 'X' && zisofs_algo[1] == 'Z')
return 2;
if (zisofs_algo[0] == 'L' && zisofs_algo[1] == '4')
return 3;
if (zisofs_algo[0] == 'Z' && zisofs_algo[1] == 'D')
return 4;
if (zisofs_algo[0] == 'B' && zisofs_algo[1] == '2')
return 5;
return -1;
}
#endif /* Libisofs_with_zliB */
static
int ziso_num_to_algo(uint8_t num, uint8_t zisofs_algo[2])
{
if (num == 0) {
zisofs_algo[0] = 'p';
zisofs_algo[1] = 'z';
return 1;
} else if (num == 1) {
zisofs_algo[0] = 'P';
zisofs_algo[1] = 'Z';
return 1;
} else if (num == 2) {
zisofs_algo[0] = 'X';
zisofs_algo[1] = 'Z';
return 2;
} else if (num == 3) {
zisofs_algo[0] = 'L';
zisofs_algo[1] = '4';
return 2;
} else if (num == 4) {
zisofs_algo[0] = 'Z';
zisofs_algo[1] = 'D';
return 2;
} else if (num == 5) {
zisofs_algo[0] = 'B';
zisofs_algo[1] = '2';
return 2;
}
return -1;
}
/* @param flag bit0= recognize zisofs2 only if ziso_v2_enabled
bit1= do not accept algorithms which libisofs does not support
*/
static
int ziso_parse_zisofs_head(IsoStream *stream, uint8_t *ziso_algo_num,
int *header_size_div4, int *block_size_log2,
uint64_t *uncompressed_size, int flag)
{
int ret, consumed = 0, i;
char zisofs_head[24];
char waste_word[4];
ret = iso_stream_read(stream, zisofs_head, 8);
if (ret < 0)
return ret;
if (ret != 8)
return ISO_ZISOFS_WRONG_INPUT;
consumed = 8;
if (memcmp(zisofs_head, zisofs_magic, 8) == 0) {
*ziso_algo_num = 0;
ret = iso_stream_read(stream, zisofs_head + 8, 8);
if (ret < 0)
return ret;
if (ret != 8)
return ISO_ZISOFS_WRONG_INPUT;
consumed += 8;
*header_size_div4 = ((unsigned char *) zisofs_head)[12];
*block_size_log2 = ((unsigned char *) zisofs_head)[13];
*uncompressed_size = iso_read_lsb(((uint8_t *) zisofs_head) + 8, 4);
if (*header_size_div4 < 4 ||
*block_size_log2 < ISO_ZISOFS_V1_MIN_LOG2 ||
*block_size_log2 > ISO_ZISOFS_V1_MAX_LOG2)
return ISO_ZISOFS_WRONG_INPUT;
} else if (memcmp(zisofs_head, zisofs2_magic, 8) == 0 &&
!(ziso_v2_enabled == 0 && (flag & 1))) {
ret = iso_stream_read(stream, zisofs_head + 8, 16);
if (ret < 0)
return ret;
if (ret != 16)
return ISO_ZISOFS_WRONG_INPUT;
consumed += 16;
*ziso_algo_num = zisofs_head[10];
*header_size_div4 = ((unsigned char *) zisofs_head)[9];
*block_size_log2 = ((unsigned char *) zisofs_head)[11];
*uncompressed_size = iso_read_lsb64(((uint8_t *) zisofs_head) + 12);
if (*header_size_div4 < 4 ||
*block_size_log2 < ISO_ZISOFS_V2_MIN_LOG2 ||
*block_size_log2 > ISO_ZISOFS_V2_MAX_LOG2 ||
(*ziso_algo_num != 1 && (flag & 2)))
return ISO_ZISOFS_WRONG_INPUT;
} else {
return ISO_ZISOFS_WRONG_INPUT;
}
for (i = consumed; i < *header_size_div4; i++) {
/* Skip surplus header words */
ret = iso_stream_read(stream, waste_word, 4);
if (ret < 0)
return ret;
if (ret != 4)
return ISO_ZISOFS_WRONG_INPUT;
}
return 1;
}
/* Note: A call with desired==0 directly after .open() only checks the file
head and loads the uncompressed size from that head.
*/
static
int ziso_stream_uncompress(IsoStream *stream, void *buf, size_t desired)
{
#ifdef Libisofs_with_zliB
int ret, todo, header_size, bs_log2, block_max = 1, blpt_size;
ZisofsFilterStreamData *data;
ZisofsFilterRuntime *rng;
ZisofsUncomprStreamData *nstd;
size_t fill = 0;
char *cbuf = buf;
uLongf buf_len;
uint64_t uncompressed_size;
int64_t i;
uint8_t algo_num, *rpt, *wpt;
if (stream == NULL) {
return ISO_NULL_POINTER;
}
data = stream->data;
nstd = stream->data;
rng= data->running;
if (rng == NULL) {
return ISO_FILE_NOT_OPENED;
}
if (rng->error_ret < 0) {
return rng->error_ret;
}
while (1) {
if (rng->state == 0) {
/* Reading file header */
ret = ziso_parse_zisofs_head(data->orig, &algo_num, &header_size,
&bs_log2, &uncompressed_size, 2);
if (ret < 0)
return (rng->error_ret = ret);
if (algo_num == 0)
blpt_size = 4;
else
blpt_size = 8;
nstd->header_size_div4 = header_size;
header_size *= 4;
data->size = uncompressed_size;
nstd->block_size_log2 = bs_log2;
rng->block_size = 1 << bs_log2;
if (desired == 0)
return 0;
/* Create and read pointer array */
rng->block_pointer_rpos = 0;
rng->block_pointer_fill = data->size / rng->block_size
+ 1 + !!(data->size % rng->block_size);
if (rng->block_pointer_fill > ziso_max_file_blocks) {
rng->block_pointer_fill = 0;
return (rng->error_ret = ISO_ZISOFS_TOO_LARGE);
}
if (ziso_block_pointer_mgt((uint64_t) rng->block_pointer_fill, 1)
== 0)
return ISO_ZISOFS_TOO_MANY_PTR;
rng->block_pointers = calloc(rng->block_pointer_fill, 8);
if (rng->block_pointers == NULL) {
ziso_block_pointer_mgt((uint64_t) rng->block_pointer_fill, 2);
rng->block_pointer_fill = 0;
return (rng->error_ret = ISO_OUT_OF_MEM);
}
ret = iso_stream_read(data->orig, rng->block_pointers,
rng->block_pointer_fill * blpt_size);
if (ret < 0)
return (rng->error_ret = ret);
if (algo_num == 0) {
/* Spread 4 byte little-endian pointer values over 8 byte */
rpt = ((uint8_t *) rng->block_pointers)
+ rng->block_pointer_fill * 4;
wpt = ((uint8_t *) rng->block_pointers)
+ rng->block_pointer_fill * 8;
while (rpt > ((uint8_t *) rng->block_pointers) + 4) {
rpt -= 4;
wpt -= 8;
memcpy(wpt, rpt, 4);
memset(wpt + 4, 0, 4);
}
memset(((uint8_t *) rng->block_pointers) + 4, 0, 4);
}
if (ret != rng->block_pointer_fill * blpt_size)
return (rng->error_ret = ISO_ZISOFS_WRONG_INPUT);
for (i = 0; i < rng->block_pointer_fill; i++) {
rng->block_pointers[i] =
iso_read_lsb64((uint8_t *) (rng->block_pointers + i));
if (i > 0)
if ((int) (rng->block_pointers[i] -
rng->block_pointers[i - 1])
> block_max)
block_max = rng->block_pointers[i]
- rng->block_pointers[i - 1];
}
rng->read_buffer = calloc(block_max, 1);
rng->block_buffer = calloc(rng->block_size, 1);
if (rng->read_buffer == NULL || rng->block_buffer == NULL)
return (rng->error_ret = ISO_OUT_OF_MEM);
rng->state = 2; /* block pointers are read */
rng->buffer_fill = rng->buffer_rpos = 0;
}
if (rng->state == 2 && rng->buffer_rpos >= rng->buffer_fill) {
/* Delivering data blocks */;
i = ++(rng->block_pointer_rpos);
if (i >= rng->block_pointer_fill) {
if (rng->out_counter == data->size) {
rng->state = 3;
rng->block_pointer_rpos--;
return fill;
}
/* More data blocks needed than announced */
return (rng->error_ret = ISO_FILTER_WRONG_INPUT);
}
todo = rng->block_pointers[i] - rng->block_pointers[i- 1];
if (todo == 0) {
memset(rng->block_buffer, 0, rng->block_size);
rng->buffer_fill = rng->block_size;
if (rng->out_counter + rng->buffer_fill > data->size &&
i == rng->block_pointer_fill - 1)
rng->buffer_fill = data->size - rng->out_counter;
} else {
ret = iso_stream_read(data->orig, rng->read_buffer, todo);
if (ret > 0) {
rng->in_counter += ret;
buf_len = rng->block_size;
ret = uncompress((Bytef *) rng->block_buffer, &buf_len,
(Bytef *) rng->read_buffer, (uLong) ret);
if (ret != Z_OK)
return (rng->error_ret = ISO_ZLIB_COMPR_ERR);
rng->buffer_fill = buf_len;
if ((int) buf_len < rng->block_size &&
i != rng->block_pointer_fill - 1)
return (rng->error_ret = ISO_ZISOFS_WRONG_INPUT);
} else if(ret == 0) {
rng->state = 3;
if (rng->out_counter != data->size) {
/* Input size shrunk */
return (rng->error_ret = ISO_FILTER_WRONG_INPUT);
}
return fill;
} else
return (rng->error_ret = ret);
}
rng->buffer_rpos = 0;
if (rng->out_counter + rng->buffer_fill > data->size) {
/* Uncompression yields more bytes than announced by header */
return (rng->error_ret = ISO_FILTER_WRONG_INPUT);
}
}
if (rng->state == 3 && rng->buffer_rpos >= rng->buffer_fill) {
return 0; /* EOF */
}
/* Transfer from rng->block_buffer to buf */
todo = desired - fill;
if (todo > rng->buffer_fill - rng->buffer_rpos)
todo = rng->buffer_fill - rng->buffer_rpos;
memcpy(cbuf + fill, rng->block_buffer + rng->buffer_rpos, todo);
fill += todo;
rng->buffer_rpos += todo;
rng->out_counter += todo;
if (fill >= desired) {
return fill;
}
}
return (rng->error_ret = ISO_FILE_READ_ERROR); /* should never be hit */
#else
return ISO_ZLIB_NOT_ENABLED;
#endif
}
static
off_t ziso_stream_get_size(IsoStream *stream)
{
off_t ret;
ZisofsFilterStreamData *data;
if (stream == NULL)
return ISO_NULL_POINTER;
data = stream->data;
if (data->size >= 0)
return data->size;
ret = ziso_stream_measure_size(stream, 0);
return ret;
}
static
int ziso_stream_is_repeatable(IsoStream *stream)
{
/* Only repeatable streams are accepted as orig */
return 1;
}
static
void ziso_stream_get_id(IsoStream *stream, unsigned int *fs_id,
dev_t *dev_id, ino_t *ino_id)
{
ZisofsFilterStreamData *data;
data = stream->data;
*fs_id = ISO_FILTER_FS_ID;
*dev_id = ISO_FILTER_ZISOFS_DEV_ID;
*ino_id = data->id;
}
static
void ziso_stream_free(IsoStream *stream)
{
ZisofsFilterStreamData *data;
ZisofsComprStreamData *nstd;
if (stream == NULL) {
return;
}
data = stream->data;
if (data->running != NULL) {
ziso_stream_close(stream);
}
if (stream->class->read == &ziso_stream_uncompress) {
if (--ziso_osiz_ref_count < 0)
ziso_osiz_ref_count = 0;
} else {
nstd = stream->data;
if (nstd->block_pointers != NULL) {
ziso_block_pointer_mgt(nstd->block_pointer_counter, 2);
free((char *) nstd->block_pointers);
}
if (--ziso_ref_count < 0)
ziso_ref_count = 0;
if (ziso_ref_count == 0)
ziso_early_bpt_discard = 0;
}
iso_stream_unref(data->orig);
free(data);
}
static
int ziso_update_size(IsoStream *stream)
{
/* By principle size is determined only once */
return 1;
}
static
IsoStream *ziso_get_input_stream(IsoStream *stream, int flag)
{
ZisofsFilterStreamData *data;
if (stream == NULL) {
return NULL;
}
data = stream->data;
return data->orig;
}
static
int ziso_clone_stream(IsoStream *old_stream, IsoStream **new_stream, int flag)
{
int ret;
IsoStream *new_input_stream = NULL, *stream = NULL;
ZisofsFilterStreamData *stream_data, *old_stream_data;
ZisofsUncomprStreamData *uncompr, *old_uncompr;
ZisofsComprStreamData *compr, *old_compr;
if (flag)
return ISO_STREAM_NO_CLONE; /* unknown option required */
ret = iso_stream_clone_filter_common(old_stream, &stream,
&new_input_stream, 0);
if (ret < 0)
return ret;
if (old_stream->class->read == &ziso_stream_uncompress) {
uncompr = calloc(1, sizeof(ZisofsUncomprStreamData));
if (uncompr == NULL)
goto no_mem;
stream_data = (ZisofsFilterStreamData *) uncompr;
old_uncompr = (ZisofsUncomprStreamData *) old_stream->data;
uncompr->zisofs_algo_num = old_uncompr->zisofs_algo_num;
uncompr->header_size_div4 = old_uncompr->header_size_div4;
uncompr->block_size_log2 = old_uncompr->block_size_log2;
} else {
compr = calloc(1, sizeof(ZisofsComprStreamData));
if (compr == NULL)
goto no_mem;
stream_data = (ZisofsFilterStreamData *) compr;
old_compr = (ZisofsComprStreamData *) old_stream->data;
compr->orig_size = old_compr->orig_size;
compr->block_pointers = NULL;
compr->block_pointer_counter = 0;
compr->open_counter = 0;
if (old_compr->block_pointers != NULL ||
old_compr->block_pointers_dropped)
compr->block_pointers_dropped = 1;
else
compr->block_pointers_dropped = 0;
}
old_stream_data = (ZisofsFilterStreamData *) old_stream->data;
stream_data->orig = new_input_stream;
stream_data->size = old_stream_data->size;
stream_data->running = NULL;
stream_data->id = ++ziso_ino_id;
stream->data = stream_data;
*new_stream = stream;
return ISO_SUCCESS;
no_mem:
if (new_input_stream != NULL)
iso_stream_unref(new_input_stream);
if (stream != NULL)
iso_stream_unref(stream);
return ISO_OUT_OF_MEM;
}
static
int ziso_cmp_ino(IsoStream *s1, IsoStream *s2);
static
int ziso_uncompress_cmp_ino(IsoStream *s1, IsoStream *s2);
IsoStreamIface ziso_stream_compress_class = {
4,
"ziso",
ziso_stream_open,
ziso_stream_close,
ziso_stream_get_size,
ziso_stream_compress,
ziso_stream_is_repeatable,
ziso_stream_get_id,
ziso_stream_free,
ziso_update_size,
ziso_get_input_stream,
ziso_cmp_ino,
ziso_clone_stream
};
IsoStreamIface ziso_stream_uncompress_class = {
4,
"osiz",
ziso_stream_open,
ziso_stream_close,
ziso_stream_get_size,
ziso_stream_uncompress,
ziso_stream_is_repeatable,
ziso_stream_get_id,
ziso_stream_free,
ziso_update_size,
ziso_get_input_stream,
ziso_uncompress_cmp_ino,
ziso_clone_stream
};
static
int ziso_cmp_ino(IsoStream *s1, IsoStream *s2)
{
/* This function may rely on being called by iso_stream_cmp_ino()
only with s1, s2 which both point to it as their .cmp_ino() function.
It would be a programming error to let any other than
ziso_stream_compress_class point to ziso_cmp_ino().
*/
if (s1->class != s2->class || (s1->class != &ziso_stream_compress_class &&
s2->class != &ziso_stream_uncompress_class))
iso_stream_cmp_ino(s1, s2, 1);
/* Both streams apply the same treatment to their input streams */
return iso_stream_cmp_ino(iso_stream_get_input_stream(s1, 0),
iso_stream_get_input_stream(s2, 0), 0);
}
static
int ziso_uncompress_cmp_ino(IsoStream *s1, IsoStream *s2)
{
/* This function may rely on being called by iso_stream_cmp_ino()
only with s1, s2 which both point to it as their .cmp_ino() function.
It would be a programming error to let any other than
ziso_stream_uncompress_class point to ziso_uncompress_cmp_ino().
This fallback endangers transitivity of iso_stream_cmp_ino().
*/
if (s1->class != s2->class ||
(s1->class != &ziso_stream_uncompress_class &&
s2->class != &ziso_stream_uncompress_class))
iso_stream_cmp_ino(s1, s2, 1);
/* Both streams apply the same treatment to their input streams */
return iso_stream_cmp_ino(iso_stream_get_input_stream(s1, 0),
iso_stream_get_input_stream(s2, 0), 0);
}
/* ------------------------------------------------------------------------- */
#ifdef Libisofs_with_zliB
static
void ziso_filter_free(FilterContext *filter)
{
/* no data are allocated */;
}
/*
* @param flag bit1= Install a decompression filter
*/
static
int ziso_filter_get_filter(FilterContext *filter, IsoStream *original,
IsoStream **filtered, int flag)
{
IsoStream *str;
ZisofsFilterStreamData *data;
ZisofsComprStreamData *cnstd = NULL;
ZisofsUncomprStreamData *unstd = NULL;
if (filter == NULL || original == NULL || filtered == NULL) {
return ISO_NULL_POINTER;
}
str = calloc(sizeof(IsoStream), 1);
if (str == NULL) {
return ISO_OUT_OF_MEM;
}
if (flag & 2) {
unstd = calloc(sizeof(ZisofsUncomprStreamData), 1);
data = (ZisofsFilterStreamData *) unstd;
} else {
cnstd = calloc(sizeof(ZisofsComprStreamData), 1);
data = (ZisofsFilterStreamData *) cnstd;
}
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->running = NULL;
/* get reference to the source */
iso_stream_ref(data->orig);
str->refcount = 1;
str->data = data;
if (flag & 2) {
unstd->zisofs_algo_num = 0;
unstd->header_size_div4 = 0;
unstd->block_size_log2 = 0;
str->class = &ziso_stream_uncompress_class;
ziso_osiz_ref_count++;
} else {
cnstd->orig_size = iso_stream_get_size(original);
cnstd->block_pointers = NULL;
cnstd->block_pointer_counter = 0;
cnstd->open_counter = 0;
cnstd->block_pointers_dropped = 0;
str->class = &ziso_stream_compress_class;
ziso_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 ziso_filter_get_compressor(FilterContext *filter, IsoStream *original,
IsoStream **filtered)
{
return ziso_filter_get_filter(filter, original, filtered, 0);
}
static
int ziso_filter_get_uncompressor(FilterContext *filter, IsoStream *original,
IsoStream **filtered)
{
return ziso_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 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;
if (flag & 2)
f->get_filter = ziso_filter_get_uncompressor;
else
f->get_filter = ziso_filter_get_compressor;
return ISO_SUCCESS;
}
#endif /* Libisofs_with_zliB */
/*
* @param flag bit0= if_block_reduction rather than if_reduction
* bit1= Install a decompression filter
* bit2= only inquire availability of zisofs filtering
* bit3= do not inquire size
*/
int ziso_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);
if (!(flag & 2)) {
if (original_size <= 0 || ((flag & 1) && original_size <= 2048)) {
return 2;
}
if (original_size >= (off_t) ISO_ZISOFS_V1_LIMIT && !ziso_v2_enabled) {
return ISO_ZISOFS_TOO_LARGE;
}
}
ret = ziso_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_zisofs_filter(IsoFile *file, int flag)
{
return ziso_add_filter(file, flag & ~8);
}
/* API function */
int iso_zisofs_get_refcounts(off_t *ziso_count, off_t *osiz_count, int flag)
{
*ziso_count = ziso_ref_count;
*osiz_count = ziso_osiz_ref_count;
return ISO_SUCCESS;
}
int ziso_add_osiz_filter(IsoFile *file, uint8_t zisofs_algo[2],
uint8_t header_size_div4, uint8_t block_size_log2,
uint64_t uncompressed_size, int flag)
{
#ifdef Libisofs_with_zliB
int ret;
ZisofsUncomprStreamData *unstd;
ret = ziso_add_filter(file, 2 | 8);
if (ret < 0)
return ret;
unstd = iso_file_get_stream(file)->data;
ret = ziso_algo_to_num(zisofs_algo);
if (ret < 0)
return ISO_ZISOFS_WRONG_INPUT;
unstd->zisofs_algo_num = ret;
unstd->header_size_div4 = header_size_div4;
unstd->block_size_log2 = block_size_log2;
unstd->std.size = uncompressed_size;
return ISO_SUCCESS;
#else
return ISO_ZLIB_NOT_ENABLED;
#endif /* ! Libisofs_with_zliB */
}
/* Determine stream type : 1=ziso , -1=osiz , 0=other , 2=ziso_by_content
and eventual ZF field parameters
@param flag bit0= allow ziso_by_content which is based on content reading
bit1= do not inquire stream->class for filters
bit2= recognize zisofs2 by magic only if ziso_v2_enabled
*/
int ziso_is_zisofs_stream(IsoStream *stream, int *stream_type,
uint8_t zisofs_algo[2],
int *header_size_div4, int *block_size_log2,
uint64_t *uncompressed_size, int flag)
{
int ret, close_ret, algo_ret;
ZisofsFilterStreamData *data;
ZisofsComprStreamData *cnstd;
ZisofsUncomprStreamData *unstd;
uint8_t algo_num;
*stream_type = 0;
if (stream->class == &ziso_stream_compress_class && !(flag & 2)) {
*stream_type = 1;
cnstd = stream->data;
*uncompressed_size = cnstd->orig_size;
*block_size_log2 = ziso_decide_bs_log2((off_t) *uncompressed_size);
if (ziso_decide_v2_usage((off_t) *uncompressed_size)) {
zisofs_algo[0] = 'P';
zisofs_algo[1] = 'Z';
*header_size_div4 = 6;
} else if (*uncompressed_size < (uint64_t) ISO_ZISOFS_V1_LIMIT) {
zisofs_algo[0] = 'p';
zisofs_algo[1] = 'z';
*header_size_div4 = 4;
} else {
return 0;
}
return 1;
} else if(stream->class == &ziso_stream_uncompress_class && !(flag & 2)) {
*stream_type = -1;
data = stream->data;
unstd = stream->data;
ret = ziso_num_to_algo(unstd->zisofs_algo_num, zisofs_algo);
if (ret < 0)
return ISO_ZISOFS_WRONG_INPUT;
*header_size_div4 = unstd->header_size_div4;
*block_size_log2 = unstd->block_size_log2;
*uncompressed_size = data->size;
return 1;
}
if (!(flag & 1))
return 0;
ret = iso_stream_open(stream);
if (ret < 0)
return ret;
ret = ziso_parse_zisofs_head(stream, &algo_num, header_size_div4,
block_size_log2, uncompressed_size,
(flag >> 2) & 1);
if (ret == 1) {
*stream_type = 2;
algo_ret = ziso_num_to_algo(algo_num, zisofs_algo);
} else {
ret = 0;
algo_ret = 1;
}
close_ret = iso_stream_close(stream);
if (algo_ret < 0)
return ISO_ZISOFS_WRONG_INPUT;
if (close_ret < 0)
return close_ret;
return ret;
}
/* API */
int iso_zisofs_set_params(struct iso_zisofs_ctrl *params, int flag)
{
#ifdef Libisofs_with_zliB
if (params->version < 0 || params->version > 1)
return ISO_WRONG_ARG_VALUE;
if (params->compression_level < 0 || params->compression_level > 9 ||
params->block_size_log2 < ISO_ZISOFS_V1_MIN_LOG2 ||
params->block_size_log2 > ISO_ZISOFS_V1_MAX_LOG2) {
return ISO_WRONG_ARG_VALUE;
}
if (params->version >= 1)
if (params->v2_enabled < 0 || params->v2_enabled > 2 ||
(params->v2_block_size_log2 != 0 &&
(params->v2_block_size_log2 < ISO_ZISOFS_V2_MIN_LOG2 ||
params->v2_block_size_log2 > ISO_ZISOFS_V2_MAX_LOG2)))
return ISO_WRONG_ARG_VALUE;
if (ziso_ref_count > 0) {
return ISO_ZISOFS_PARAM_LOCK;
}
ziso_compression_level = params->compression_level;
ziso_block_size_log2 = params->block_size_log2;
if (params->version == 0)
return 1;
ziso_v2_enabled = params->v2_enabled;
if (params->v2_block_size_log2 > 0)
ziso_v2_block_size_log2 = params->v2_block_size_log2;
if (params->max_total_blocks > 0)
ziso_max_total_blocks = params->max_total_blocks;
if (params->max_file_blocks > 0)
ziso_max_file_blocks = params->max_file_blocks;
if (params->block_number_target != 0)
ziso_block_number_target = params->block_number_target;
if (params->bpt_discard_file_blocks != 0)
ziso_many_block_limit = params->bpt_discard_file_blocks;
if (params->bpt_discard_free_ratio != 0.0)
ziso_keep_blocks_free_ratio = params->bpt_discard_free_ratio;
return 1;
#else
return ISO_ZLIB_NOT_ENABLED;
#endif /* ! Libisofs_with_zliB */
}
/* API */
int iso_zisofs_get_params(struct iso_zisofs_ctrl *params, int flag)
{
#ifdef Libisofs_with_zliB
if (params->version < 0 || params->version > 1)
return ISO_WRONG_ARG_VALUE;
params->compression_level = ziso_compression_level;
params->block_size_log2 = ziso_block_size_log2;
if (params->version == 1) {
params->v2_enabled = ziso_v2_enabled;
params->v2_block_size_log2 = ziso_v2_block_size_log2;
params->max_total_blocks = ziso_max_total_blocks;
params->current_total_blocks = ziso_block_pointer_mgt((uint64_t) 0, 3);
params->max_file_blocks = ziso_max_file_blocks;
params->block_number_target = ziso_block_number_target;
params->bpt_discard_file_blocks = ziso_many_block_limit;
params->bpt_discard_free_ratio = ziso_keep_blocks_free_ratio;
}
return 1;
#else
return ISO_ZLIB_NOT_ENABLED;
#endif /* ! Libisofs_with_zliB */
}
/* API */
int iso_stream_get_zisofs_par(IsoStream *stream, int *stream_type,
uint8_t zisofs_algo[2], uint8_t* algo_num,
int *block_size_log2, int flag)
{
#ifdef Libisofs_with_zliB
uint64_t uncompressed_size;
int header_size_div4, ret;
if (stream == NULL)
return ISO_NULL_POINTER;
ret = ziso_is_zisofs_stream(stream, stream_type, zisofs_algo,
&header_size_div4, block_size_log2,
&uncompressed_size, 0);
if (ret <= 0 || (*stream_type != -1 && *stream_type != 1))
return 0;
*algo_num = ziso_algo_to_num(zisofs_algo);
return 1;
#else
return ISO_ZLIB_NOT_ENABLED;
#endif /* ! Libisofs_with_zliB */
}
/* API */
int iso_stream_zisofs_discard_bpt(IsoStream *stream, int flag)
{
#ifdef Libisofs_with_zliB
int ret;
if (stream == NULL)
return ISO_NULL_POINTER;
ret = ziso_discard_bpt(stream, 1);
return ret;
#else
return ISO_ZLIB_NOT_ENABLED;
#endif /* ! Libisofs_with_zliB */
}
/* API */
int iso_zisofs_ctrl_susp_z2(int enable)
{
if (enable == 0 || enable == 1)
iso_zisofs2_enable_susp_z2 = enable;
return iso_zisofs2_enable_susp_z2;
}