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