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+/**
+ * \file lzma/check.h
+ * \brief Integrity checks
+ */
+
+/*
+ * 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 Type of the integrity check (Check ID)
+ *
+ * The .xz format supports multiple types of checks that are calculated
+ * from the uncompressed data. They vary in both speed and ability to
+ * detect errors.
+ */
+typedef enum {
+ LZMA_CHECK_NONE = 0,
+ /**<
+ * No Check is calculated.
+ *
+ * Size of the Check field: 0 bytes
+ */
+
+ LZMA_CHECK_CRC32 = 1,
+ /**<
+ * CRC32 using the polynomial from the IEEE 802.3 standard
+ *
+ * Size of the Check field: 4 bytes
+ */
+
+ LZMA_CHECK_CRC64 = 4,
+ /**<
+ * CRC64 using the polynomial from the ECMA-182 standard
+ *
+ * Size of the Check field: 8 bytes
+ */
+
+ LZMA_CHECK_SHA256 = 10
+ /**<
+ * SHA-256
+ *
+ * Size of the Check field: 32 bytes
+ */
+} lzma_check;
+
+
+/**
+ * \brief Maximum valid Check ID
+ *
+ * The .xz file format specification specifies 16 Check IDs (0-15). Some
+ * of them are only reserved, that is, no actual Check algorithm has been
+ * assigned. When decoding, liblzma still accepts unknown Check IDs for
+ * future compatibility. If a valid but unsupported Check ID is detected,
+ * liblzma can indicate a warning; see the flags LZMA_TELL_NO_CHECK,
+ * LZMA_TELL_UNSUPPORTED_CHECK, and LZMA_TELL_ANY_CHECK in container.h.
+ */
+#define LZMA_CHECK_ID_MAX 15
+
+
+/**
+ * \brief Test if the given Check ID is supported
+ *
+ * Return true if the given Check ID is supported by this liblzma build.
+ * Otherwise false is returned. It is safe to call this with a value that
+ * is not in the range [0, 15]; in that case the return value is always false.
+ *
+ * You can assume that LZMA_CHECK_NONE and LZMA_CHECK_CRC32 are always
+ * supported (even if liblzma is built with limited features).
+ */
+extern LZMA_API(lzma_bool) lzma_check_is_supported(lzma_check check)
+ lzma_nothrow lzma_attr_const;
+
+
+/**
+ * \brief Get the size of the Check field with the given Check ID
+ *
+ * Although not all Check IDs have a check algorithm associated, the size of
+ * every Check is already frozen. This function returns the size (in bytes) of
+ * the Check field with the specified Check ID. The values are:
+ * { 0, 4, 4, 4, 8, 8, 8, 16, 16, 16, 32, 32, 32, 64, 64, 64 }
+ *
+ * If the argument is not in the range [0, 15], UINT32_MAX is returned.
+ */
+extern LZMA_API(uint32_t) lzma_check_size(lzma_check check)
+ lzma_nothrow lzma_attr_const;
+
+
+/**
+ * \brief Maximum size of a Check field
+ */
+#define LZMA_CHECK_SIZE_MAX 64
+
+
+/**
+ * \brief Calculate CRC32
+ *
+ * Calculate CRC32 using the polynomial from the IEEE 802.3 standard.
+ *
+ * \param buf Pointer to the input buffer
+ * \param size Size of the input buffer
+ * \param crc Previously returned CRC value. This is used to
+ * calculate the CRC of a big buffer in smaller chunks.
+ * Set to zero when starting a new calculation.
+ *
+ * \return Updated CRC value, which can be passed to this function
+ * again to continue CRC calculation.
+ */
+extern LZMA_API(uint32_t) lzma_crc32(
+ const uint8_t *buf, size_t size, uint32_t crc)
+ lzma_nothrow lzma_attr_pure;
+
+
+/**
+ * \brief Calculate CRC64
+ *
+ * Calculate CRC64 using the polynomial from the ECMA-182 standard.
+ *
+ * This function is used similarly to lzma_crc32(). See its documentation.
+ */
+extern LZMA_API(uint64_t) lzma_crc64(
+ const uint8_t *buf, size_t size, uint64_t crc)
+ lzma_nothrow lzma_attr_pure;
+
+
+/*
+ * SHA-256 functions are currently not exported to public API.
+ * Contact Lasse Collin if you think it should be.
+ */
+
+
+/**
+ * \brief Get the type of the integrity check
+ *
+ * This function can be called only immediately after lzma_code() has
+ * returned LZMA_NO_CHECK, LZMA_UNSUPPORTED_CHECK, or LZMA_GET_CHECK.
+ * Calling this function in any other situation has undefined behavior.
+ */
+extern LZMA_API(lzma_check) lzma_get_check(const lzma_stream *strm)
+ lzma_nothrow;