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+/**
+ * \file lzma/info.h
+ * \brief Handling of Stream size information
+ *
+ * \author Copyright (C) 1999-2006 Igor Pavlov
+ * \author Copyright (C) 2007 Lasse Collin
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ */
+
+#ifndef LZMA_H_INTERNAL
+# error Never include this file directly. Use <lzma.h> instead.
+#endif
+
+
+/**********
+ * Basics *
+ **********/
+
+/**
+ * \brief Opaque data type to hold the size information
+ */
+typedef struct lzma_info_s lzma_info;
+
+
+typedef struct {
+ /**
+ * \brief Total Size of this Block
+ *
+ * This can be LZMA_VLI_VALUE_UNKNOWN.
+ */
+ lzma_vli total_size;
+
+ /**
+ * \brief Uncompressed Size of this Block
+ *
+ * This can be LZMA_VLI_VALUE_UNKNOWN.
+ */
+ lzma_vli uncompressed_size;
+
+ /**
+ * \brief Offset of the first byte of the Block
+ *
+ * In encoder, this is useful to find out the alignment of the Block.
+ *
+ * In decoder, this is useful when doing random-access reading
+ * with help from lzma_info_data_locate().
+ */
+ lzma_vli stream_offset;
+
+ /**
+ * \brief Uncompressed offset of the Block
+ *
+ * Offset of the first uncompressed byte of the Block relative to
+ * all uncompressed data in the Block.
+ * FIXME desc
+ */
+ lzma_vli uncompressed_offset;
+
+ /**
+ * \brief Pointers to internal data structures
+ *
+ * Applications must not touch these.
+ */
+ void *internal[4];
+
+} lzma_info_iter;
+
+
+typedef enum {
+ LZMA_INFO_STREAM_START,
+ LZMA_INFO_HEADER_METADATA,
+ LZMA_INFO_TOTAL,
+ LZMA_INFO_UNCOMPRESSED,
+ LZMA_INFO_FOOTER_METADATA
+} lzma_info_size;
+
+
+/**
+ * \brief Allocates and initializes a new lzma_info structure
+ *
+ * If info is NULL, a new lzma_info structure is allocated, initialized, and
+ * a pointer to it returned. If allocation fails, NULL is returned.
+ *
+ * If info 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 info given as argument.)
+ */
+extern lzma_info *lzma_info_init(lzma_info *info, lzma_allocator *allocator);
+
+
+/**
+ * \brief Resets lzma_info
+ *
+ * This is like calling lzma_info_end() and lzma_info_create(), but
+ * re-uses the existing base structure.
+ */
+extern void lzma_info_reset(
+ lzma_info *info, lzma_allocator *allocator);
+
+
+/**
+ * \brief Frees memory allocated for a lzma_info structure
+ */
+extern void lzma_info_free(lzma_info *info, lzma_allocator *allocator);
+
+
+/************************
+ * Setting known values *
+ ************************/
+
+/**
+ * \brief Set a known size value
+ *
+ * \param info Pointer returned by lzma_info_create()
+ * \param type Any value from lzma_info_size
+ * \param size Value to set or verify
+ *
+ * \return LZMA_OK on success, LZMA_DATA_ERROR if the size doesn't
+ * match the existing information, or LZMA_PROG_ERROR
+ * if type is invalid or size is not a valid VLI.
+ */
+extern lzma_ret lzma_info_size_set(
+ lzma_info *info, lzma_info_size type, lzma_vli size);
+
+
+/**
+ * \brief Sets the Index
+ *
+ * The given lzma_index list is "absorbed" by this function. The application
+ * must not access it after this function call, even if this function returns
+ * an error.
+ *
+ * \note The given lzma_index will at some point get freed by the
+ * lzma_info_* functions. If you use a custom lzma_allocator,
+ * make sure that it can free the lzma_index.
+ */
+extern lzma_ret lzma_info_index_set(
+ lzma_info *info, lzma_allocator *allocator,
+ lzma_index *index, lzma_bool eat_index);
+
+
+/**
+ * \brief Sets information from a known Metadata Block
+ *
+ * This is a shortcut for calling lzma_info_size_set() with different type
+ * arguments, lzma_info_index_set() with metadata->index.
+ */
+extern lzma_ret lzma_info_metadata_set(lzma_info *info,
+ lzma_allocator *allocator, lzma_metadata *metadata,
+ lzma_bool is_header_metadata, lzma_bool eat_index);
+
+
+/***************
+ * Incremental *
+ ***************/
+
+/**
+ * \brief Prepares an iterator to be used with given lzma_info structure
+ *
+ *
+ */
+extern void lzma_info_iter_begin(lzma_info *info, lzma_info_iter *iter);
+
+
+/**
+ * \brief Moves to the next Index Record
+ *
+ *
+ */
+extern lzma_ret lzma_info_iter_next(
+ lzma_info_iter *iter, lzma_allocator *allocator);
+
+
+/**
+ * \brief Sets or verifies the sizes in the Index Record
+ *
+ * \param iter Pointer to iterator to be set or verified
+ * \param total_size
+ * Total Size in bytes or LZMA_VLI_VALUE_UNKNOWN
+ * \param uncompressed_size
+ * Uncompressed Size or LZMA_VLI_VALUE_UNKNOWN
+ *
+ * \return - LZMA_OK: All OK.
+ * - LZMA_DATA_ERROR: Given sizes don't match with the already
+ * known sizes.
+ * - LZMA_PROG_ERROR: Internal error, possibly integer
+ * overflow (e.g. the sum of all the known sizes is too big)
+ */
+extern lzma_ret lzma_info_iter_set(lzma_info_iter *iter,
+ lzma_vli total_size, lzma_vli uncompressed_size);
+
+
+/**
+ * \brief Locates a Data Block
+ *
+ * \param iter Properly initialized iterator
+ * \param allocator Pointer to lzma_allocator or NULL
+ * \param uncompressed_offset
+ * Target offset to locate. The final offset
+ * will be equal or smaller than this.
+ * \param allow_alloc True if this function is allowed to call
+ * lzma_info_iter_next() to allocate a new Record
+ * if the requested offset reached end of Index
+ * Record list. Note that if Index has been marked
+ * final, lzma_info_iter_next() is never called.
+ *
+ * \return - LZMA_OK: All OK, *iter updated accordingly.
+ * - LZMA_DATA_ERROR: Trying to search past the end of the Index
+ * Record list, and allocating a new Record was not allowed
+ * either because allow_alloc was false or Index was final.
+ * - LZMA_PROG_ERROR: Internal error (probably integer
+ * overflow causing some lzma_vli getting too big).
+ */
+extern lzma_ret lzma_info_iter_locate(lzma_info_iter *iter,
+ lzma_allocator *allocator, lzma_vli uncompressed_offset,
+ lzma_bool allow_alloc);
+
+
+/**
+ * \brief Finishes incrementally constructed Index
+ *
+ * This sets the known Total Size and Uncompressed of the Data Blocks
+ * based on the information collected from the Index Records, and marks
+ * the Index as final.
+ */
+extern lzma_ret lzma_info_index_finish(lzma_info *info);
+
+
+/***************************
+ * Reading the information *
+ ***************************/
+
+/**
+ * \brief Gets a known size
+ *
+ *
+ */
+extern lzma_vli lzma_info_size_get(
+ const lzma_info *info, lzma_info_size type);
+
+extern lzma_vli lzma_info_metadata_locate(
+ const lzma_info *info, lzma_bool is_header_metadata);
+
+/**
+ * \brief Gets a pointer to the beginning of the Index list
+ *
+ * If detach is true, the Index will be detached from the lzma_info
+ * structure, and thus not be modified or freed by lzma_info_end().
+ *
+ * If detach is false, the application must not modify the Index in any way.
+ * Also, the Index list is guaranteed to be valid only till the next call
+ * to any lzma_info_* function.
+ */
+extern lzma_index *lzma_info_index_get(lzma_info *info, lzma_bool detach);
+
+
+extern size_t lzma_info_index_count_get(const lzma_info *info);
+
+
+extern uint32_t lzma_info_metadata_alignment_get(
+ const lzma_info *info, lzma_bool is_header_metadata);
+
+
+
+/**
+ * \brief Locate a Block containing the given uncompressed offset
+ *
+ * This function is useful when you need to do random-access reading in
+ * a Multi-Block Stream.
+ *
+ * \param info Pointer to lzma_info that has at least one
+ * Index Record. The Index doesn't need to be finished.
+ * \param uncompressed_target
+ * Uncompressed target offset which the caller would
+ * like to locate from the Stream.
+ * \param stream_offset
+ * Starting offset (relative to the beginning the Stream)
+ * of the Block containing the requested location.
+ * \param uncompressed_offset
+ * The actual uncompressed offset of the beginning of
+ * the Block. uncompressed_offset <= uncompressed_target
+ * is always true; the application needs to uncompress
+ * uncompressed_target - uncompressed_offset bytes to
+ * reach the requested target offset.
+ * \param total_size
+ * Total Size of the Block. If the Index is incomplete,
+ * this may be LZMA_VLI_VALUE_UNKNOWN indicating unknown
+ * size.
+ * \param uncompressed_size
+ * Uncompressed Size of the Block. If the Index is
+ * incomplete, this may be LZMA_VLI_VALUE_UNKNOWN
+ * indicating unknown size. The application must pass
+ * this value to the Block decoder to verify FIXME
+ *
+ * \return
+ *
+ * \note This function is currently implemented as a linear search.
+ * If there are many Index Records, this can be really slow.
+ * This can be improved in newer liblzma versions if needed.
+ */
+extern lzma_bool lzma_info_data_locate(const lzma_info *info,
+ lzma_vli uncompressed_target,
+ lzma_vli *lzma_restrict stream_offset,
+ lzma_vli *lzma_restrict uncompressed_offset,
+ lzma_vli *lzma_restrict total_size,
+ lzma_vli *lzma_restrict uncompressed_size);