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New API functions iso_zisofs_set_params(), iso_zisofs_get_params()

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This commit is contained in:
Thomas Schmitt 2009-04-11 19:10:37 +02:00
parent 63ddfc1c94
commit 99ddd5c116
3 changed files with 116 additions and 15 deletions
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69
libisofs/filters/zisofs.c
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@ -42,8 +42,8 @@
/* Sizes to be used for compression. Decompression learns from input header. */
#define Libisofs_zisofs_block_log2 15
#define Libisofs_zisofs_block_sizE 32768
static uint8_t ziso_block_size_log2 = 15;
static int ziso_block_size = 32768;
/* Individual runtime properties exist only as long as the stream is opened.
@ -122,11 +122,11 @@ int ziso_running_new(ZisofsFilterRuntime **running, int flag)
if (flag & 1)
return 1;
o->block_size = Libisofs_zisofs_block_sizE;
o->block_size = ziso_block_size;
#ifdef Libisofs_with_zliB
o->buffer_size= compressBound((uLong) Libisofs_zisofs_block_sizE);
o->buffer_size= compressBound((uLong) ziso_block_size);
#else
o->buffer_size= 2 * Libisofs_zisofs_block_sizE;
o->buffer_size= 2 * ziso_block_size;
#endif
o->read_buffer = calloc(o->block_size, 1);
o->block_buffer = calloc(o->buffer_size, 1);
@ -152,14 +152,11 @@ static off_t ziso_ref_count = 0;
static off_t ziso_osiz_ref_count = 0;
#ifdef Libisofs_with_zliB
/* Parameter for compress2() , see <zlib.h> */
/* >>> make this globally adjustable ? (problem with existing instances)
>>> individually adjustable ? (eats another 1 to 8 bytes)
*/
#define Libisofs_zisofs_compr_leveL Z_DEFAULT_COMPRESSION
static int ziso_compression_level = 6;
#endif /* Libisofs_with_zliB */
@ -337,7 +334,7 @@ int ziso_stream_compress(IsoStream *stream, void *buf, size_t desired)
iso_lsb((unsigned char *) (rng->block_buffer + 8),
(uint32_t) orig_size, 4);
rng->block_buffer[12] = 4;
rng->block_buffer[13] = Libisofs_zisofs_block_log2;
rng->block_buffer[13] = ziso_block_size_log2;
rng->block_buffer[14] = rng->block_buffer[15] = 0;
rng->buffer_fill = 16;
rng->buffer_rpos = 0;
@ -404,7 +401,7 @@ int ziso_stream_compress(IsoStream *stream, void *buf, size_t desired)
buf_len = rng->buffer_size;
ret = compress2((Bytef *) rng->block_buffer, &buf_len,
(Bytef *) rng->read_buffer, (uLong) ret,
Libisofs_zisofs_compr_leveL);
ziso_compression_level);
if (ret != Z_OK) {
return (rng->error_ret = ISO_ZLIB_COMPR_ERR);
}
@ -1026,7 +1023,7 @@ int ziso_is_zisofs_stream(IsoStream *stream, int *stream_type,
*stream_type = 1;
cnstd = stream->data;
*header_size_div4 = 4;
*block_size_log2 = Libisofs_zisofs_block_log2;
*block_size_log2 = ziso_block_size_log2;
*uncompressed_size = cnstd->orig_size;
return 1;
} else if(stream->class == &ziso_stream_uncompress_class) {
@ -1041,3 +1038,47 @@ int ziso_is_zisofs_stream(IsoStream *stream, int *stream_type,
return 0;
}
int iso_zisofs_set_params(struct iso_zisofs_ctrl *params, int flag)
{
#ifdef Libisofs_with_zliB
if (params->compression_level < 0 || params->compression_level > 9 ||
params->block_size_log2 < 15 || params->block_size_log2 > 17) {
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;
ziso_block_size = 1 << ziso_block_size_log2;
return 1;
#else
return ISO_ZLIB_NOT_ENABLED;
#endif /* ! Libisofs_with_zliB */
}
int iso_zisofs_get_params(struct iso_zisofs_ctrl *params, int flag)
{
#ifdef Libisofs_with_zliB
params->compression_level = ziso_compression_level;
params->block_size_log2 = ziso_block_size_log2;
return 1;
#else
return ISO_ZLIB_NOT_ENABLED;
#endif /* ! Libisofs_with_zliB */
}

60
libisofs/libisofs.h
View File

@ -4717,7 +4717,12 @@ int iso_local_set_attrs(char *disk_path, size_t num_attrs, char **names,
/* ts A90409 */
/** Input stream is not in zisofs format (FAILURE, HIGH, -349) */
#define ISO_ZISOFS_WRONG_INPUT 0xE830FEA3
/* ts A90411 */
/** Cannot set global zisofs parameters while filters exist
(FAILURE, HIGH, -350) */
#define ISO_ZISOFS_PARAM_LOCK 0xE830FEA2
/* --------------------------- Filters in General -------------------------- */
@ -4939,6 +4944,59 @@ int iso_file_add_zisofs_filter(IsoFile *file, int flag);
int iso_zisofs_get_refcounts(off_t *ziso_count, off_t *osiz_count, int flag);
/**
* Parameter set for iso_zisofs_set_params().
*
* @since 0.6.18
*/
struct iso_zisofs_ctrl {
/* Set to 0 for this version of the structure */
int version;
/* Compression level for zlib function compress2(). From <zlib.h>:
* "between 0 and 9:
* 1 gives best speed, 9 gives best compression, 0 gives no compression"
* Default is 6.
*/
int compression_level;
/* Log2 of the block size for compression filters. Allowed values are:
* 15 = 32 kiB , 16 = 64 kiB , 17 = 128 kiB
*/
uint8_t block_size_log2;
};
/**
* Set the global parameters for zisofs filtering.
* This is only allowed while no zisofs compression filters are installed.
* i.e. ziso_count returned by iso_zisofs_get_refcounts() has to be 0.
* @param params
* Pointer to a structure with the intended settings.
* @param flag
* Bitfield for control purposes, unused yet, submit 0
* @return
* 1 on success, <0 on error
*
* @since 0.6.18
*/
int iso_zisofs_set_params(struct iso_zisofs_ctrl *params, int flag);
/**
* Get the current global parameters for zisofs filtering.
* @param params
* Pointer to a caller provided structure which shall take the settings.
* @param flag
* Bitfield for control purposes, unused yet, submit 0
* @return
* 1 on success, <0 on error
*
* @since 0.6.18
*/
int iso_zisofs_get_params(struct iso_zisofs_ctrl *params, int flag);
/* ------------------------------------------------------------------------- */

2
libisofs/messages.c
View File

@ -259,6 +259,8 @@ const char *iso_error_to_msg(int errcode)
return "zlib compression/decompression error";
case ISO_ZISOFS_WRONG_INPUT:
return "Input stream is not in zisofs format";
case ISO_ZISOFS_PARAM_LOCK:
return "Cannot set global zisofs parameters while filters exist";
default:
return "Unknown error";
}