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/*
* Copyright (c) 2007-2011, Novell Inc.
*
* This program is licensed under the BSD license, read LICENSE.BSD
* for further information
*/
#ifndef LIBSOLV_REPOPAGE_H
#define LIBSOLV_REPOPAGE_H
#define REPOPAGE_BLOBBITS 15
#define REPOPAGE_BLOBSIZE (1 << REPOPAGE_BLOBBITS)
typedef struct s_Attrblobpage
{
/* page_size == 0 means the page is not backed by some file storage.
Otherwise it is L*2+(compressed ? 1 : 0), with L being the data
length. */
unsigned int page_offset;
unsigned int page_size;
} Attrblobpage;
typedef struct s_Repopagestore {
int pagefd; /* file descriptor we're paging from */
long file_offset; /* pages in file start here */
unsigned char *blob_store;
unsigned int num_pages;
/* mapped_at[page] == -1 --> not loaded, otherwise offset into
store->blob_store. The size of the mapping is REPOPAGE_BLOBSIZE
except for the last page. */
unsigned int *mapped_at;
Attrblobpage *file_pages;
/* mapped[i] is -1 if nothing is mapped at logical page I,
otherwise it contains the page number (of the mapped page). */
unsigned int *mapped;
unsigned int nmapped;
unsigned int rr_counter;
} Repopagestore;
#ifdef __cplusplus
extern "C" {
#endif
void repopagestore_init(Repopagestore *store);
void repopagestore_free(Repopagestore *store);
/* load pages pstart..pend into consecutive memory, return address */
unsigned char *repopagestore_load_page_range(Repopagestore *store, unsigned int pstart, unsigned int pend);
/* compress a page, return compressed len */
unsigned int repopagestore_compress_page(unsigned char *page, unsigned int len, unsigned char *cpage, unsigned int max);
/* setup page data for repodata_load_page_range */
int repopagestore_read_or_setup_pages(Repopagestore *store, FILE *fp, unsigned int pagesz, unsigned int blobsz);
void repopagestore_disable_paging(Repopagestore *store);
#ifdef __cplusplus
}
#endif
#endif /* LIBSOLV_REPOPAGE_H */
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