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Using faster compression level

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and fixed a bug with uncompression if the last block is all zero.
This commit is contained in:
Thomas Schmitt 2009-04-11 07:49:20 +02:00
parent 540df15ec9
commit 77591e4546
1 changed files with 14 additions and 5 deletions
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19
libisofs/filters/zisofs.c
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@ -146,6 +146,15 @@ static unsigned char zisofs_magic[9] =
{0x37, 0xE4, 0x53, 0x96, 0xC9, 0xDB, 0xD6, 0x07}; {0x37, 0xE4, 0x53, 0x96, 0xC9, 0xDB, 0xD6, 0x07};
#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
#endif /* Libisofs_with_zliB */
/* /*
* The common data payload of an individual Zisofs Filter IsoStream * The common data payload of an individual Zisofs Filter IsoStream
*/ */
@ -386,7 +395,8 @@ int ziso_stream_compress(IsoStream *stream, void *buf, size_t desired)
} else { } else {
buf_len = rng->buffer_size; buf_len = rng->buffer_size;
ret = compress2((Bytef *) rng->block_buffer, &buf_len, ret = compress2((Bytef *) rng->block_buffer, &buf_len,
(Bytef *) rng->read_buffer, (uLong) ret, 9); (Bytef *) rng->read_buffer, (uLong) ret,
Libisofs_zisofs_compr_leveL);
if (ret != Z_OK) { if (ret != Z_OK) {
return (rng->error_ret = ISO_ZLIB_COMPR_ERR); return (rng->error_ret = ISO_ZLIB_COMPR_ERR);
} }
@ -557,10 +567,9 @@ int ziso_stream_uncompress(IsoStream *stream, void *buf, size_t desired)
if (todo == 0) { if (todo == 0) {
memset(rng->block_buffer, 0, rng->block_size); memset(rng->block_buffer, 0, rng->block_size);
rng->buffer_fill = rng->block_size; rng->buffer_fill = rng->block_size;
if (rng->in_counter + rng->buffer_fill > data->size && if (rng->out_counter + rng->buffer_fill > data->size &&
i == rng->block_pointer_fill - 1) i == rng->block_pointer_fill - 1)
rng->buffer_fill = data->size - rng->in_counter; rng->buffer_fill = data->size - rng->out_counter;
rng->in_counter += rng->buffer_fill;
} else { } else {
ret = iso_stream_read(data->orig, rng->read_buffer, todo); ret = iso_stream_read(data->orig, rng->read_buffer, todo);
if (ret > 0) { if (ret > 0) {
@ -893,7 +902,7 @@ int iso_file_add_zisofs_filter(IsoFile *file, int flag)
original_size = iso_file_get_size(file); original_size = iso_file_get_size(file);
if (!(flag & 2)) { if (!(flag & 2)) {
if (original_size <= 0) { if (original_size <= 0 || ((flag & 1) && original_size <= 2048)) {
return 2; return 2;
} }
if (original_size > 4294967295.0) { if (original_size > 4294967295.0) {