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base.h	24.28 MB	View DL Edit
bcj.h	2.57 MB	View DL Edit
block.h	21.59 MB	View DL Edit
check.h	4.16 MB	View DL Edit
container.h	24.26 MB	View DL Edit
delta.h	1.82 MB	View DL Edit
filter.h	16.13 MB	View DL Edit
hardware.h	2.54 MB	View DL Edit
index.h	22.94 MB	View DL Edit
index_hash.h	3.82 MB	View DL Edit
lzma12.h	14.4 MB	View DL Edit
stream_flags.h	8.06 MB	View DL Edit
version.h	3.42 MB	View DL Edit
vli.h	6.39 MB	View DL Edit

Edit file: /usr/include/lzma/index_hash.h

/**
 * \file        lzma/index_hash.h
 * \brief       Validate Index by using a hash function
 *
 * Hashing makes it possible to use constant amount of memory to validate
 * Index of arbitrary size.
 */

/*
 * Author: Lasse Collin
 *
 * This file has been put into the public domain.
 * You can do whatever you want with this file.
 *
 * See ../lzma.h for information about liblzma as a whole.
 */

#ifndef LZMA_H_INTERNAL
#	error Never include this file directly. Use <lzma.h> instead.
#endif

/**
 * \brief       Opaque data type to hold the Index hash
 */
typedef struct lzma_index_hash_s lzma_index_hash;

/**
 * \brief       Allocate and initialize a new lzma_index_hash structure
 *
 * If index_hash is NULL, a new lzma_index_hash structure is allocated,
 * initialized, and a pointer to it returned. If allocation fails, NULL
 * is returned.
 *
 * If index_hash is non-NULL, it is reinitialized and the same pointer
 * returned. In this case, return value cannot be NULL or a different
 * pointer than the index_hash that was given as an argument.
 */
extern LZMA_API(lzma_index_hash *) lzma_index_hash_init(
		lzma_index_hash *index_hash, const lzma_allocator *allocator)
		lzma_nothrow lzma_attr_warn_unused_result;

/**
 * \brief       Deallocate lzma_index_hash structure
 */
extern LZMA_API(void) lzma_index_hash_end(
		lzma_index_hash *index_hash, const lzma_allocator *allocator)
		lzma_nothrow;

/**
 * \brief       Add a new Record to an Index hash
 *
 * \param       index             Pointer to a lzma_index_hash structure
 * \param       unpadded_size     Unpadded Size of a Block
 * \param       uncompressed_size Uncompressed Size of a Block
 *
 * \return      - LZMA_OK
 *              - LZMA_DATA_ERROR: Compressed or uncompressed size of the
 *                Stream or size of the Index field would grow too big.
 *              - LZMA_PROG_ERROR: Invalid arguments or this function is being
 *                used when lzma_index_hash_decode() has already been used.
 */
extern LZMA_API(lzma_ret) lzma_index_hash_append(lzma_index_hash *index_hash,
		lzma_vli unpadded_size, lzma_vli uncompressed_size)
		lzma_nothrow lzma_attr_warn_unused_result;

/**
 * \brief       Decode and validate the Index field
 *
 * After telling the sizes of all Blocks with lzma_index_hash_append(),
 * the actual Index field is decoded with this function. Specifically,
 * once decoding of the Index field has been started, no more Records
 * can be added using lzma_index_hash_append().
 *
 * This function doesn't use lzma_stream structure to pass the input data.
 * Instead, the input buffer is specified using three arguments. This is
 * because it matches better the internal APIs of liblzma.
 *
 * \param       index_hash      Pointer to a lzma_index_hash structure
 * \param       in              Pointer to the beginning of the input buffer
 * \param       in_pos          in[*in_pos] is the next byte to process
 * \param       in_size         in[in_size] is the first byte not to process
 *
 * \return      - LZMA_OK: So far good, but more input is needed.
 *              - LZMA_STREAM_END: Index decoded successfully and it matches
 *                the Records given with lzma_index_hash_append().
 *              - LZMA_DATA_ERROR: Index is corrupt or doesn't match the
 *                information given with lzma_index_hash_append().
 *              - LZMA_BUF_ERROR: Cannot progress because *in_pos >= in_size.
 *              - LZMA_PROG_ERROR
 */
extern LZMA_API(lzma_ret) lzma_index_hash_decode(lzma_index_hash *index_hash,
		const uint8_t *in, size_t *in_pos, size_t in_size)
		lzma_nothrow lzma_attr_warn_unused_result;

/**
 * \brief       Get the size of the Index field as bytes
 *
 * This is needed to verify the Backward Size field in the Stream Footer.
 */
extern LZMA_API(lzma_vli) lzma_index_hash_size(
		const lzma_index_hash *index_hash)
		lzma_nothrow lzma_attr_pure;

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