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#ifndef __ELZMA_COMMON_INTERNAL_H__
#define __ELZMA_COMMON_INTERNAL_H__
#include "common.h"
/** a structure which may be cast and passed into Igor's allocate
* routines */
struct elzma_alloc_struct
{
void *(*Alloc)(void *p, size_t size);
void (*Free)(void *p, void *address); /* address can be 0 */
elzma_malloc clientMallocFunc;
void *clientMallocContext;
elzma_free clientFreeFunc;
void *clientFreeContext;
};
/* initialize an allocation structure, may be called safely multiple
* times */
void init_alloc_struct(struct elzma_alloc_struct *allocStruct, elzma_malloc clientMallocFunc,
void *clientMallocContext, elzma_free clientFreeFunc,
void *clientFreeContext);
/** superset representation of a compressed file header */
struct elzma_file_header
{
unsigned char pb;
unsigned char lp;
unsigned char lc;
unsigned char isStreamed;
long long unsigned int uncompressedSize;
unsigned int dictSize;
};
/** superset representation of a compressed file footer */
struct elzma_file_footer
{
unsigned int crc32;
long long unsigned int uncompressedSize;
};
/** a structure which encapsulates information about the particular
* file header and footer in use (lzip vs lzma vs (eventually) xz.
* The intention of this structure is to simplify compression and
* decompression logic by abstracting the file format details a bit. */
struct elzma_format_handler
{
unsigned int header_size;
void (*init_header)(struct elzma_file_header *hdr);
int (*parse_header)(const unsigned char *hdrBuf, struct elzma_file_header *hdr);
int (*serialize_header)(unsigned char *hdrBuf, const struct elzma_file_header *hdr);
unsigned int footer_size;
int (*serialize_footer)(struct elzma_file_footer *ftr, unsigned char *ftrBuf);
int (*parse_footer)(const unsigned char *ftrBuf, struct elzma_file_footer *ftr);
};
#endif
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