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687 lines
23 KiB
687 lines
23 KiB
/**
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* \file lzma/index.h
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* \brief Handling of .xz Index and related information
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*/
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/*
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* Author: Lasse Collin
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*
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* This file has been put into the public domain.
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* You can do whatever you want with this file.
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*
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* See ../lzma.h for information about liblzma as a whole.
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*/
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#ifndef LZMA_H_INTERNAL
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# error Never include this file directly. Use <lzma.h> instead.
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#endif
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/**
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* \brief Opaque data type to hold the Index(es) and other information
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*
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* lzma_index often holds just one .xz Index and possibly the Stream Flags
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* of the same Stream and size of the Stream Padding field. However,
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* multiple lzma_indexes can be concatenated with lzma_index_cat() and then
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* there may be information about multiple Streams in the same lzma_index.
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*
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* Notes about thread safety: Only one thread may modify lzma_index at
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* a time. All functions that take non-const pointer to lzma_index
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* modify it. As long as no thread is modifying the lzma_index, getting
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* information from the same lzma_index can be done from multiple threads
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* at the same time with functions that take a const pointer to
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* lzma_index or use lzma_index_iter. The same iterator must be used
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* only by one thread at a time, of course, but there can be as many
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* iterators for the same lzma_index as needed.
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*/
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typedef struct lzma_index_s lzma_index;
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/**
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* \brief Iterator to get information about Blocks and Streams
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*/
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typedef struct {
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struct {
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/**
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* \brief Pointer to Stream Flags
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*
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* This is NULL if Stream Flags have not been set for
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* this Stream with lzma_index_stream_flags().
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*/
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const lzma_stream_flags *flags;
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const void *reserved_ptr1;
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const void *reserved_ptr2;
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const void *reserved_ptr3;
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/**
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* \brief Stream number in the lzma_index
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*
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* The first Stream is 1.
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*/
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lzma_vli number;
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/**
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* \brief Number of Blocks in the Stream
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*
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* If this is zero, the block structure below has
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* undefined values.
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*/
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lzma_vli block_count;
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/**
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* \brief Compressed start offset of this Stream
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*
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* The offset is relative to the beginning of the lzma_index
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* (i.e. usually the beginning of the .xz file).
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*/
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lzma_vli compressed_offset;
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/**
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* \brief Uncompressed start offset of this Stream
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*
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* The offset is relative to the beginning of the lzma_index
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* (i.e. usually the beginning of the .xz file).
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*/
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lzma_vli uncompressed_offset;
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/**
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* \brief Compressed size of this Stream
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*
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* This includes all headers except the possible
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* Stream Padding after this Stream.
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*/
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lzma_vli compressed_size;
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/**
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* \brief Uncompressed size of this Stream
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*/
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lzma_vli uncompressed_size;
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/**
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* \brief Size of Stream Padding after this Stream
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*
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* If it hasn't been set with lzma_index_stream_padding(),
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* this defaults to zero. Stream Padding is always
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* a multiple of four bytes.
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*/
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lzma_vli padding;
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lzma_vli reserved_vli1;
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lzma_vli reserved_vli2;
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lzma_vli reserved_vli3;
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lzma_vli reserved_vli4;
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} stream;
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struct {
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/**
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* \brief Block number in the file
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*
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* The first Block is 1.
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*/
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lzma_vli number_in_file;
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/**
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* \brief Compressed start offset of this Block
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*
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* This offset is relative to the beginning of the
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* lzma_index (i.e. usually the beginning of the .xz file).
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* Normally this is where you should seek in the .xz file
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* to start decompressing this Block.
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*/
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lzma_vli compressed_file_offset;
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/**
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* \brief Uncompressed start offset of this Block
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*
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* This offset is relative to the beginning of the lzma_index
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* (i.e. usually the beginning of the .xz file).
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*
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* When doing random-access reading, it is possible that
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* the target offset is not exactly at Block boundary. One
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* will need to compare the target offset against
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* uncompressed_file_offset or uncompressed_stream_offset,
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* and possibly decode and throw away some amount of data
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* before reaching the target offset.
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*/
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lzma_vli uncompressed_file_offset;
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/**
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* \brief Block number in this Stream
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*
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* The first Block is 1.
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*/
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lzma_vli number_in_stream;
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/**
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* \brief Compressed start offset of this Block
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*
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* This offset is relative to the beginning of the Stream
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* containing this Block.
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*/
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lzma_vli compressed_stream_offset;
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/**
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* \brief Uncompressed start offset of this Block
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*
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* This offset is relative to the beginning of the Stream
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* containing this Block.
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*/
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lzma_vli uncompressed_stream_offset;
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/**
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* \brief Uncompressed size of this Block
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*
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* You should pass this to the Block decoder if you will
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* decode this Block. It will allow the Block decoder to
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* validate the uncompressed size.
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*/
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lzma_vli uncompressed_size;
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/**
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* \brief Unpadded size of this Block
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*
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* You should pass this to the Block decoder if you will
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* decode this Block. It will allow the Block decoder to
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* validate the unpadded size.
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*/
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lzma_vli unpadded_size;
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/**
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* \brief Total compressed size
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*
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* This includes all headers and padding in this Block.
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* This is useful if you need to know how many bytes
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* the Block decoder will actually read.
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*/
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lzma_vli total_size;
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lzma_vli reserved_vli1;
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lzma_vli reserved_vli2;
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lzma_vli reserved_vli3;
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lzma_vli reserved_vli4;
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const void *reserved_ptr1;
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const void *reserved_ptr2;
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const void *reserved_ptr3;
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const void *reserved_ptr4;
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} block;
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/*
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* Internal data which is used to store the state of the iterator.
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* The exact format may vary between liblzma versions, so don't
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* touch these in any way.
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*/
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union {
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const void *p;
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size_t s;
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lzma_vli v;
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} internal[6];
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} lzma_index_iter;
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/**
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* \brief Operation mode for lzma_index_iter_next()
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*/
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typedef enum {
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LZMA_INDEX_ITER_ANY = 0,
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/**<
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* \brief Get the next Block or Stream
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*
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* Go to the next Block if the current Stream has at least
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* one Block left. Otherwise go to the next Stream even if
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* it has no Blocks. If the Stream has no Blocks
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* (lzma_index_iter.stream.block_count == 0),
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* lzma_index_iter.block will have undefined values.
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*/
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LZMA_INDEX_ITER_STREAM = 1,
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/**<
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* \brief Get the next Stream
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*
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* Go to the next Stream even if the current Stream has
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* unread Blocks left. If the next Stream has at least one
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* Block, the iterator will point to the first Block.
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* If there are no Blocks, lzma_index_iter.block will have
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* undefined values.
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*/
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LZMA_INDEX_ITER_BLOCK = 2,
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/**<
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* \brief Get the next Block
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*
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* Go to the next Block if the current Stream has at least
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* one Block left. If the current Stream has no Blocks left,
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* the next Stream with at least one Block is located and
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* the iterator will be made to point to the first Block of
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* that Stream.
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*/
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LZMA_INDEX_ITER_NONEMPTY_BLOCK = 3
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/**<
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* \brief Get the next non-empty Block
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*
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* This is like LZMA_INDEX_ITER_BLOCK except that it will
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* skip Blocks whose Uncompressed Size is zero.
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*/
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} lzma_index_iter_mode;
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/**
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* \brief Calculate memory usage of lzma_index
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*
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* On disk, the size of the Index field depends on both the number of Records
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* stored and how big values the Records store (due to variable-length integer
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* encoding). When the Index is kept in lzma_index structure, the memory usage
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* depends only on the number of Records/Blocks stored in the Index(es), and
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* in case of concatenated lzma_indexes, the number of Streams. The size in
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* RAM is almost always significantly bigger than in the encoded form on disk.
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*
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* This function calculates an approximate amount of memory needed hold
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* the given number of Streams and Blocks in lzma_index structure. This
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* value may vary between CPU architectures and also between liblzma versions
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* if the internal implementation is modified.
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*/
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extern LZMA_API(uint64_t) lzma_index_memusage(
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lzma_vli streams, lzma_vli blocks) lzma_nothrow;
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/**
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* \brief Calculate the memory usage of an existing lzma_index
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*
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* This is a shorthand for lzma_index_memusage(lzma_index_stream_count(i),
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* lzma_index_block_count(i)).
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*/
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extern LZMA_API(uint64_t) lzma_index_memused(const lzma_index *i)
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lzma_nothrow;
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/**
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* \brief Allocate and initialize a new lzma_index structure
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*
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* \return On success, a pointer to an empty initialized lzma_index is
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* returned. If allocation fails, NULL is returned.
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*/
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extern LZMA_API(lzma_index *) lzma_index_init(const lzma_allocator *allocator)
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lzma_nothrow;
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/**
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* \brief Deallocate lzma_index
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*
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* If i is NULL, this does nothing.
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*/
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extern LZMA_API(void) lzma_index_end(
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lzma_index *i, const lzma_allocator *allocator) lzma_nothrow;
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/**
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* \brief Add a new Block to lzma_index
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*
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* \param i Pointer to a lzma_index structure
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* \param allocator Pointer to lzma_allocator, or NULL to
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* use malloc()
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* \param unpadded_size Unpadded Size of a Block. This can be
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* calculated with lzma_block_unpadded_size()
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* after encoding or decoding the Block.
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* \param uncompressed_size Uncompressed Size of a Block. This can be
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* taken directly from lzma_block structure
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* after encoding or decoding the Block.
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*
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* Appending a new Block does not invalidate iterators. For example,
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* if an iterator was pointing to the end of the lzma_index, after
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* lzma_index_append() it is possible to read the next Block with
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* an existing iterator.
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*
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* \return - LZMA_OK
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* - LZMA_MEM_ERROR
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* - LZMA_DATA_ERROR: Compressed or uncompressed size of the
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* Stream or size of the Index field would grow too big.
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* - LZMA_PROG_ERROR
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*/
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extern LZMA_API(lzma_ret) lzma_index_append(
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lzma_index *i, const lzma_allocator *allocator,
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lzma_vli unpadded_size, lzma_vli uncompressed_size)
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lzma_nothrow lzma_attr_warn_unused_result;
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/**
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* \brief Set the Stream Flags
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*
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* Set the Stream Flags of the last (and typically the only) Stream
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* in lzma_index. This can be useful when reading information from the
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* lzma_index, because to decode Blocks, knowing the integrity check type
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* is needed.
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*
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* The given Stream Flags are copied into internal preallocated structure
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* in the lzma_index, thus the caller doesn't need to keep the *stream_flags
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* available after calling this function.
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*
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* \return - LZMA_OK
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* - LZMA_OPTIONS_ERROR: Unsupported stream_flags->version.
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* - LZMA_PROG_ERROR
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*/
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extern LZMA_API(lzma_ret) lzma_index_stream_flags(
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lzma_index *i, const lzma_stream_flags *stream_flags)
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lzma_nothrow lzma_attr_warn_unused_result;
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/**
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* \brief Get the types of integrity Checks
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*
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* If lzma_index_stream_flags() is used to set the Stream Flags for
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* every Stream, lzma_index_checks() can be used to get a bitmask to
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* indicate which Check types have been used. It can be useful e.g. if
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* showing the Check types to the user.
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*
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* The bitmask is 1 << check_id, e.g. CRC32 is 1 << 1 and SHA-256 is 1 << 10.
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*/
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extern LZMA_API(uint32_t) lzma_index_checks(const lzma_index *i)
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lzma_nothrow lzma_attr_pure;
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/**
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* \brief Set the amount of Stream Padding
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*
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* Set the amount of Stream Padding of the last (and typically the only)
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* Stream in the lzma_index. This is needed when planning to do random-access
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* reading within multiple concatenated Streams.
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*
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* By default, the amount of Stream Padding is assumed to be zero bytes.
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*
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* \return - LZMA_OK
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* - LZMA_DATA_ERROR: The file size would grow too big.
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* - LZMA_PROG_ERROR
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*/
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extern LZMA_API(lzma_ret) lzma_index_stream_padding(
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lzma_index *i, lzma_vli stream_padding)
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lzma_nothrow lzma_attr_warn_unused_result;
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/**
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* \brief Get the number of Streams
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*/
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extern LZMA_API(lzma_vli) lzma_index_stream_count(const lzma_index *i)
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lzma_nothrow lzma_attr_pure;
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/**
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* \brief Get the number of Blocks
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*
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* This returns the total number of Blocks in lzma_index. To get number
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* of Blocks in individual Streams, use lzma_index_iter.
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*/
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extern LZMA_API(lzma_vli) lzma_index_block_count(const lzma_index *i)
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lzma_nothrow lzma_attr_pure;
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/**
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* \brief Get the size of the Index field as bytes
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*
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* This is needed to verify the Backward Size field in the Stream Footer.
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*/
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extern LZMA_API(lzma_vli) lzma_index_size(const lzma_index *i)
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lzma_nothrow lzma_attr_pure;
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/**
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* \brief Get the total size of the Stream
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*
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* If multiple lzma_indexes have been combined, this works as if the Blocks
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* were in a single Stream. This is useful if you are going to combine
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* Blocks from multiple Streams into a single new Stream.
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*/
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extern LZMA_API(lzma_vli) lzma_index_stream_size(const lzma_index *i)
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lzma_nothrow lzma_attr_pure;
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/**
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* \brief Get the total size of the Blocks
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*
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* This doesn't include the Stream Header, Stream Footer, Stream Padding,
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* or Index fields.
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*/
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extern LZMA_API(lzma_vli) lzma_index_total_size(const lzma_index *i)
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lzma_nothrow lzma_attr_pure;
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/**
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* \brief Get the total size of the file
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*
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* When no lzma_indexes have been combined with lzma_index_cat() and there is
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* no Stream Padding, this function is identical to lzma_index_stream_size().
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* If multiple lzma_indexes have been combined, this includes also the headers
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* of each separate Stream and the possible Stream Padding fields.
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*/
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extern LZMA_API(lzma_vli) lzma_index_file_size(const lzma_index *i)
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lzma_nothrow lzma_attr_pure;
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/**
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* \brief Get the uncompressed size of the file
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*/
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extern LZMA_API(lzma_vli) lzma_index_uncompressed_size(const lzma_index *i)
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lzma_nothrow lzma_attr_pure;
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/**
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* \brief Initialize an iterator
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*
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* \param iter Pointer to a lzma_index_iter structure
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* \param i lzma_index to which the iterator will be associated
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*
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* This function associates the iterator with the given lzma_index, and calls
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* lzma_index_iter_rewind() on the iterator.
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*
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* This function doesn't allocate any memory, thus there is no
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* lzma_index_iter_end(). The iterator is valid as long as the
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* associated lzma_index is valid, that is, until lzma_index_end() or
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* using it as source in lzma_index_cat(). Specifically, lzma_index doesn't
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* become invalid if new Blocks are added to it with lzma_index_append() or
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* if it is used as the destination in lzma_index_cat().
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*
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* It is safe to make copies of an initialized lzma_index_iter, for example,
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* to easily restart reading at some particular position.
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*/
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extern LZMA_API(void) lzma_index_iter_init(
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lzma_index_iter *iter, const lzma_index *i) lzma_nothrow;
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/**
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* \brief Rewind the iterator
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*
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* Rewind the iterator so that next call to lzma_index_iter_next() will
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* return the first Block or Stream.
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*/
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extern LZMA_API(void) lzma_index_iter_rewind(lzma_index_iter *iter)
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lzma_nothrow;
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/**
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* \brief Get the next Block or Stream
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*
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* \param iter Iterator initialized with lzma_index_iter_init()
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* \param mode Specify what kind of information the caller wants
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* to get. See lzma_index_iter_mode for details.
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*
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* \return If next Block or Stream matching the mode was found, *iter
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|
* is updated and this function returns false. If no Block or
|
|
* Stream matching the mode is found, *iter is not modified
|
|
* and this function returns true. If mode is set to an unknown
|
|
* value, *iter is not modified and this function returns true.
|
|
*/
|
|
extern LZMA_API(lzma_bool) lzma_index_iter_next(
|
|
lzma_index_iter *iter, lzma_index_iter_mode mode)
|
|
lzma_nothrow lzma_attr_warn_unused_result;
|
|
|
|
|
|
/**
|
|
* \brief Locate a Block
|
|
*
|
|
* If it is possible to seek in the .xz file, it is possible to parse
|
|
* the Index field(s) and use lzma_index_iter_locate() to do random-access
|
|
* reading with granularity of Block size.
|
|
*
|
|
* \param iter Iterator that was earlier initialized with
|
|
* lzma_index_iter_init().
|
|
* \param target Uncompressed target offset which the caller would
|
|
* like to locate from the Stream
|
|
*
|
|
* If the target is smaller than the uncompressed size of the Stream (can be
|
|
* checked with lzma_index_uncompressed_size()):
|
|
* - Information about the Stream and Block containing the requested
|
|
* uncompressed offset is stored into *iter.
|
|
* - Internal state of the iterator is adjusted so that
|
|
* lzma_index_iter_next() can be used to read subsequent Blocks or Streams.
|
|
* - This function returns false.
|
|
*
|
|
* If target is greater than the uncompressed size of the Stream, *iter
|
|
* is not modified, and this function returns true.
|
|
*/
|
|
extern LZMA_API(lzma_bool) lzma_index_iter_locate(
|
|
lzma_index_iter *iter, lzma_vli target) lzma_nothrow;
|
|
|
|
|
|
/**
|
|
* \brief Concatenate lzma_indexes
|
|
*
|
|
* Concatenating lzma_indexes is useful when doing random-access reading in
|
|
* multi-Stream .xz file, or when combining multiple Streams into single
|
|
* Stream.
|
|
*
|
|
* \param dest lzma_index after which src is appended
|
|
* \param src lzma_index to be appended after dest. If this
|
|
* function succeeds, the memory allocated for src
|
|
* is freed or moved to be part of dest, and all
|
|
* iterators pointing to src will become invalid.
|
|
* \param allocator Custom memory allocator; can be NULL to use
|
|
* malloc() and free().
|
|
*
|
|
* \return - LZMA_OK: lzma_indexes were concatenated successfully.
|
|
* src is now a dangling pointer.
|
|
* - LZMA_DATA_ERROR: *dest would grow too big.
|
|
* - LZMA_MEM_ERROR
|
|
* - LZMA_PROG_ERROR
|
|
*/
|
|
extern LZMA_API(lzma_ret) lzma_index_cat(lzma_index *dest, lzma_index *src,
|
|
const lzma_allocator *allocator)
|
|
lzma_nothrow lzma_attr_warn_unused_result;
|
|
|
|
|
|
/**
|
|
* \brief Duplicate lzma_index
|
|
*
|
|
* \return A copy of the lzma_index, or NULL if memory allocation failed.
|
|
*/
|
|
extern LZMA_API(lzma_index *) lzma_index_dup(
|
|
const lzma_index *i, const lzma_allocator *allocator)
|
|
lzma_nothrow lzma_attr_warn_unused_result;
|
|
|
|
|
|
/**
|
|
* \brief Initialize .xz Index encoder
|
|
*
|
|
* \param strm Pointer to properly prepared lzma_stream
|
|
* \param i Pointer to lzma_index which should be encoded.
|
|
*
|
|
* The valid `action' values for lzma_code() are LZMA_RUN and LZMA_FINISH.
|
|
* It is enough to use only one of them (you can choose freely).
|
|
*
|
|
* \return - LZMA_OK: Initialization succeeded, continue with lzma_code().
|
|
* - LZMA_MEM_ERROR
|
|
* - LZMA_PROG_ERROR
|
|
*/
|
|
extern LZMA_API(lzma_ret) lzma_index_encoder(
|
|
lzma_stream *strm, const lzma_index *i)
|
|
lzma_nothrow lzma_attr_warn_unused_result;
|
|
|
|
|
|
/**
|
|
* \brief Initialize .xz Index decoder
|
|
*
|
|
* \param strm Pointer to properly prepared lzma_stream
|
|
* \param i The decoded Index will be made available via
|
|
* this pointer. Initially this function will
|
|
* set *i to NULL (the old value is ignored). If
|
|
* decoding succeeds (lzma_code() returns
|
|
* LZMA_STREAM_END), *i will be set to point
|
|
* to a new lzma_index, which the application
|
|
* has to later free with lzma_index_end().
|
|
* \param memlimit How much memory the resulting lzma_index is
|
|
* allowed to require. liblzma 5.2.3 and earlier
|
|
* don't allow 0 here and return LZMA_PROG_ERROR;
|
|
* later versions treat 0 as if 1 had been specified.
|
|
*
|
|
* Valid `action' arguments to lzma_code() are LZMA_RUN and LZMA_FINISH.
|
|
* There is no need to use LZMA_FINISH, but it's allowed because it may
|
|
* simplify certain types of applications.
|
|
*
|
|
* \return - LZMA_OK: Initialization succeeded, continue with lzma_code().
|
|
* - LZMA_MEM_ERROR
|
|
* - LZMA_PROG_ERROR
|
|
*
|
|
* liblzma 5.2.3 and older list also LZMA_MEMLIMIT_ERROR here
|
|
* but that error code has never been possible from this
|
|
* initialization function.
|
|
*/
|
|
extern LZMA_API(lzma_ret) lzma_index_decoder(
|
|
lzma_stream *strm, lzma_index **i, uint64_t memlimit)
|
|
lzma_nothrow lzma_attr_warn_unused_result;
|
|
|
|
|
|
/**
|
|
* \brief Single-call .xz Index encoder
|
|
*
|
|
* \param i lzma_index to be encoded
|
|
* \param out Beginning of the output buffer
|
|
* \param out_pos The next byte will be written to out[*out_pos].
|
|
* *out_pos is updated only if encoding succeeds.
|
|
* \param out_size Size of the out buffer; the first byte into
|
|
* which no data is written to is out[out_size].
|
|
*
|
|
* \return - LZMA_OK: Encoding was successful.
|
|
* - LZMA_BUF_ERROR: Output buffer is too small. Use
|
|
* lzma_index_size() to find out how much output
|
|
* space is needed.
|
|
* - LZMA_PROG_ERROR
|
|
*
|
|
* \note This function doesn't take allocator argument since all
|
|
* the internal data is allocated on stack.
|
|
*/
|
|
extern LZMA_API(lzma_ret) lzma_index_buffer_encode(const lzma_index *i,
|
|
uint8_t *out, size_t *out_pos, size_t out_size) lzma_nothrow;
|
|
|
|
|
|
/**
|
|
* \brief Single-call .xz Index decoder
|
|
*
|
|
* \param i If decoding succeeds, *i will point to a new
|
|
* lzma_index, which the application has to
|
|
* later free with lzma_index_end(). If an error
|
|
* occurs, *i will be NULL. The old value of *i
|
|
* is always ignored and thus doesn't need to be
|
|
* initialized by the caller.
|
|
* \param memlimit Pointer to how much memory the resulting
|
|
* lzma_index is allowed to require. The value
|
|
* pointed by this pointer is modified if and only
|
|
* if LZMA_MEMLIMIT_ERROR is returned.
|
|
* \param allocator Pointer to lzma_allocator, or NULL to use malloc()
|
|
* \param in Beginning of the input buffer
|
|
* \param in_pos The next byte will be read from in[*in_pos].
|
|
* *in_pos is updated only if decoding succeeds.
|
|
* \param in_size Size of the input buffer; the first byte that
|
|
* won't be read is in[in_size].
|
|
*
|
|
* \return - LZMA_OK: Decoding was successful.
|
|
* - LZMA_MEM_ERROR
|
|
* - LZMA_MEMLIMIT_ERROR: Memory usage limit was reached.
|
|
* The minimum required memlimit value was stored to *memlimit.
|
|
* - LZMA_DATA_ERROR
|
|
* - LZMA_PROG_ERROR
|
|
*/
|
|
extern LZMA_API(lzma_ret) lzma_index_buffer_decode(lzma_index **i,
|
|
uint64_t *memlimit, const lzma_allocator *allocator,
|
|
const uint8_t *in, size_t *in_pos, size_t in_size)
|
|
lzma_nothrow;
|