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New API call int iso_node_zf_by_magic() for marking pre-compressed data

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file nodes which were originally produced by program mkzftree.
This commit is contained in:
Thomas Schmitt
2009-04-13 20:51:38 +02:00
parent 9a873ed693
commit 1f2fd259ae
5 changed files with 309 additions and 44 deletions
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79
libisofs/filters/zisofs.c
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@ -468,6 +468,29 @@ int ziso_stream_compress(IsoStream *stream, void *buf, size_t desired)
}
static
int ziso_parse_zisofs_head(IsoStream *stream, int *header_size_div4,
int *block_size_log2, uint32_t *uncompressed_size,
int flag)
{
int ret;
char zisofs_head[16];
ret = iso_stream_read(stream, zisofs_head, 16);
if (ret < 0)
return ret;
*header_size_div4 = ((unsigned char *) zisofs_head)[12];
*block_size_log2 = ((unsigned char *) zisofs_head)[13];
if (ret != 16 || memcmp(zisofs_head, zisofs_magic, 8) != 0 ||
*header_size_div4 < 4 ||
*block_size_log2 < 15 || *block_size_log2 > 17) {
return ISO_ZISOFS_WRONG_INPUT;
}
*uncompressed_size = iso_read_lsb(((uint8_t *) zisofs_head) + 8, 4);
return 1;
}
/* Note: A call with desired==0 directly after .open() only checks the file
head and loads the uncompressed size from that head.
*/
@ -484,7 +507,12 @@ int ziso_stream_uncompress(IsoStream *stream, void *buf, size_t desired)
size_t fill = 0;
char *cbuf = buf;
uLongf buf_len;
#ifndef NIX
uint32_t uncompressed_size;
#else
char zisofs_head[16];
#endif
if (stream == NULL) {
return ISO_NULL_POINTER;
@ -502,6 +530,16 @@ int ziso_stream_uncompress(IsoStream *stream, void *buf, size_t desired)
while (1) {
if (rng->state == 0) {
/* Reading file header */
#ifndef NIX
ret = ziso_parse_zisofs_head(data->orig, &header_size, &bs_log2,
&uncompressed_size, 0);
if (ret < 0)
return (rng->error_ret = ret);
nstd->header_size_div4 = header_size;
header_size *= 4;
data->size = uncompressed_size;
#else
ret = iso_stream_read(data->orig, zisofs_head, 16);
if (ret < 0)
return (rng->error_ret = ret);
@ -511,18 +549,25 @@ int ziso_stream_uncompress(IsoStream *stream, void *buf, size_t desired)
header_size < 16 || bs_log2 < 15 || bs_log2 > 17) {
return (rng->error_ret = ISO_ZISOFS_WRONG_INPUT);
}
data->size = iso_read_lsb(((uint8_t *) zisofs_head) + 8, 4);
nstd->header_size_div4 = header_size / 4;
#endif /* NIX */
nstd->block_size_log2 = bs_log2;
rng->block_size = 1 << bs_log2;
if (header_size > 16) {
/* Skip surplus header bytes */
/* >>> This must be a loop
ret = iso_stream_read(data->orig, zisofs_head, header_size-16);
if (ret < 0)
return (rng->error_ret = ret);
if (ret != header_size - 16)
*/
return (rng->error_ret = ISO_ZISOFS_WRONG_INPUT);
}
data->size = iso_read_lsb(((uint8_t *) zisofs_head) + 8, 4);
nstd->header_size_div4 = header_size / 4;
nstd->block_size_log2 = bs_log2;
if (desired == 0) {
return 0;
@ -1012,26 +1057,29 @@ int ziso_add_osiz_filter(IsoFile *file, uint8_t header_size_div4,
/* Determine stream type : 1=ziso , -1=osiz , 0=other
/* 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
*/
int ziso_is_zisofs_stream(IsoStream *stream, int *stream_type,
int *header_size_div4, int *block_size_log2,
uint32_t *uncompressed_size, int flag)
{
int ret, close_ret;
ZisofsFilterStreamData *data;
ZisofsComprStreamData *cnstd;
ZisofsUncomprStreamData *unstd;
*stream_type = 0;
if (stream->class == &ziso_stream_compress_class) {
if (stream->class == &ziso_stream_compress_class && !(flag & 2)) {
*stream_type = 1;
cnstd = stream->data;
*header_size_div4 = 4;
*block_size_log2 = ziso_block_size_log2;
*uncompressed_size = cnstd->orig_size;
return 1;
} else if(stream->class == &ziso_stream_uncompress_class) {
} else if(stream->class == &ziso_stream_uncompress_class && !(flag & 2)) {
*stream_type = -1;
data = stream->data;
unstd = stream->data;
@ -1040,7 +1088,24 @@ int ziso_is_zisofs_stream(IsoStream *stream, int *stream_type,
*uncompressed_size = data->size;
return 1;
}
return 0;
if (!(flag & 1))
return 0;
ret = iso_stream_open(stream);
if (ret < 0)
return ret;
ret = ziso_parse_zisofs_head(stream, header_size_div4,
block_size_log2, uncompressed_size, 0);
if (ret == 1) {
*stream_type = 2;
} else {
ret = 0;
}
close_ret = iso_stream_close(stream);
if (close_ret < 0)
return close_ret;
return ret;
}