Add an unpatched version of xz, XZ Utils, to /trunk/deps/third_party

xz/src/liblzma/api/lzma/stream_flags.h

+/**
+ * \file        lzma/stream_flags.h
+ * \brief       .xz Stream Header and Stream Footer encoder and decoder
+ */
+
+/*
+ * 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       Size of Stream Header and Stream Footer
+ *
+ * Stream Header and Stream Footer have the same size and they are not
+ * going to change even if a newer version of the .xz file format is
+ * developed in future.
+ */
+#define LZMA_STREAM_HEADER_SIZE 12
+
+
+/**
+ * \brief       Options for encoding/decoding Stream Header and Stream Footer
+ */
+typedef struct {
+        /**
+         * \brief       Stream Flags format version
+         *
+         * To prevent API and ABI breakages if new features are needed in
+         * Stream Header or Stream Footer, a version number is used to
+         * indicate which fields in this structure are in use. For now,
+         * version must always be zero. With non-zero version, the
+         * lzma_stream_header_encode() and lzma_stream_footer_encode()
+         * will return LZMA_OPTIONS_ERROR.
+         *
+         * lzma_stream_header_decode() and lzma_stream_footer_decode()
+         * will always set this to the lowest value that supports all the
+         * features indicated by the Stream Flags field. The application
+         * must check that the version number set by the decoding functions
+         * is supported by the application. Otherwise it is possible that
+         * the application will decode the Stream incorrectly.
+         */
+        uint32_t version;
+
+        /**
+         * \brief       Backward Size
+         *
+         * Backward Size must be a multiple of four bytes. In this Stream
+         * format version, Backward Size is the size of the Index field.
+         *
+         * Backward Size isn't actually part of the Stream Flags field, but
+         * it is convenient to include in this structure anyway. Backward
+         * Size is present only in the Stream Footer. There is no need to
+         * initialize backward_size when encoding Stream Header.
+         *
+         * lzma_stream_header_decode() always sets backward_size to
+         * LZMA_VLI_UNKNOWN so that it is convenient to use
+         * lzma_stream_flags_compare() when both Stream Header and Stream
+         * Footer have been decoded.
+         */
+        lzma_vli backward_size;
+#       define LZMA_BACKWARD_SIZE_MIN 4
+#       define LZMA_BACKWARD_SIZE_MAX (LZMA_VLI_C(1) << 34)
+
+        /**
+         * \brief       Check ID
+         *
+         * This indicates the type of the integrity check calculated from
+         * uncompressed data.
+         */
+        lzma_check check;
+
+        /*
+         * Reserved space to allow possible future extensions without
+         * breaking the ABI. You should not touch these, because the
+         * names of these variables may change.
+         *
+         * (We will never be able to use all of these since Stream Flags
+         * is just two bytes plus Backward Size of four bytes. But it's
+         * nice to have the proper types when they are needed.)
+         */
+        lzma_reserved_enum reserved_enum1;
+        lzma_reserved_enum reserved_enum2;
+        lzma_reserved_enum reserved_enum3;
+        lzma_reserved_enum reserved_enum4;
+        lzma_reserved_enum reserved_enum5;
+        lzma_reserved_enum reserved_enum6;
+        lzma_bool reserved_bool1;
+        lzma_bool reserved_bool2;
+        lzma_bool reserved_bool3;
+        lzma_bool reserved_bool4;
+        lzma_bool reserved_bool5;
+        lzma_bool reserved_bool6;
+        lzma_bool reserved_bool7;
+        lzma_bool reserved_bool8;
+        uint32_t reserved_int1;
+        uint32_t reserved_int2;
+        uint32_t reserved_int3;
+        uint32_t reserved_int4;
+
+} lzma_stream_flags;
+
+
+/**
+ * \brief       Encode Stream Header
+ *
+ * \param       options     Stream Header options to be encoded.
+ *                          options->backward_size is ignored and doesn't
+ *                          need to be initialized.
+ * \param       out         Beginning of the output buffer of
+ *                          LZMA_STREAM_HEADER_SIZE bytes.
+ *
+ * \return      - LZMA_OK: Encoding was successful.
+ *              - LZMA_OPTIONS_ERROR: options->version is not supported by
+ *                this liblzma version.
+ *              - LZMA_PROG_ERROR: Invalid options.
+ */
+extern LZMA_API(lzma_ret) lzma_stream_header_encode(
+                const lzma_stream_flags *options, uint8_t *out)
+                lzma_nothrow lzma_attr_warn_unused_result;
+
+
+/**
+ * \brief       Encode Stream Footer
+ *
+ * \param       options     Stream Footer options to be encoded.
+ * \param       out         Beginning of the output buffer of
+ *                          LZMA_STREAM_HEADER_SIZE bytes.
+ *
+ * \return      - LZMA_OK: Encoding was successful.
+ *              - LZMA_OPTIONS_ERROR: options->version is not supported by
+ *                this liblzma version.
+ *              - LZMA_PROG_ERROR: Invalid options.
+ */
+extern LZMA_API(lzma_ret) lzma_stream_footer_encode(
+                const lzma_stream_flags *options, uint8_t *out)
+                lzma_nothrow lzma_attr_warn_unused_result;
+
+
+/**
+ * \brief       Decode Stream Header
+ *
+ * \param       options     Stream Header options to be encoded.
+ * \param       in          Beginning of the input buffer of
+ *                          LZMA_STREAM_HEADER_SIZE bytes.
+ *
+ * options->backward_size is always set to LZMA_VLI_UNKNOWN. This is to
+ * help comparing Stream Flags from Stream Header and Stream Footer with
+ * lzma_stream_flags_compare().
+ *
+ * \return      - LZMA_OK: Decoding was successful.
+ *              - LZMA_FORMAT_ERROR: Magic bytes don't match, thus the given
+ *                buffer cannot be Stream Header.
+ *              - LZMA_DATA_ERROR: CRC32 doesn't match, thus the header
+ *                is corrupt.
+ *              - LZMA_OPTIONS_ERROR: Unsupported options are present
+ *                in the header.
+ *
+ * \note        When decoding .xz files that contain multiple Streams, it may
+ *              make sense to print "file format not recognized" only if
+ *              decoding of the Stream Header of the _first_ Stream gives
+ *              LZMA_FORMAT_ERROR. If non-first Stream Header gives
+ *              LZMA_FORMAT_ERROR, the message used for LZMA_DATA_ERROR is
+ *              probably more appropriate.
+ *
+ *              For example, Stream decoder in liblzma uses LZMA_DATA_ERROR if
+ *              LZMA_FORMAT_ERROR is returned by lzma_stream_header_decode()
+ *              when decoding non-first Stream.
+ */
+extern LZMA_API(lzma_ret) lzma_stream_header_decode(
+                lzma_stream_flags *options, const uint8_t *in)
+                lzma_nothrow lzma_attr_warn_unused_result;
+
+
+/**
+ * \brief       Decode Stream Footer
+ *
+ * \param       options     Stream Header options to be encoded.
+ * \param       in          Beginning of the input buffer of
+ *                          LZMA_STREAM_HEADER_SIZE bytes.
+ *
+ * \return      - LZMA_OK: Decoding was successful.
+ *              - LZMA_FORMAT_ERROR: Magic bytes don't match, thus the given
+ *                buffer cannot be Stream Footer.
+ *              - LZMA_DATA_ERROR: CRC32 doesn't match, thus the Stream Footer
+ *                is corrupt.
+ *              - LZMA_OPTIONS_ERROR: Unsupported options are present
+ *                in Stream Footer.
+ *
+ * \note        If Stream Header was already decoded successfully, but
+ *              decoding Stream Footer returns LZMA_FORMAT_ERROR, the
+ *              application should probably report some other error message
+ *              than "file format not recognized", since the file more likely
+ *              is corrupt (possibly truncated). Stream decoder in liblzma
+ *              uses LZMA_DATA_ERROR in this situation.
+ */
+extern LZMA_API(lzma_ret) lzma_stream_footer_decode(
+                lzma_stream_flags *options, const uint8_t *in)
+                lzma_nothrow lzma_attr_warn_unused_result;
+
+
+/**
+ * \brief       Compare two lzma_stream_flags structures
+ *
+ * backward_size values are compared only if both are not
+ * LZMA_VLI_UNKNOWN.
+ *
+ * \return      - LZMA_OK: Both are equal. If either had backward_size set
+ *                to LZMA_VLI_UNKNOWN, backward_size values were not
+ *                compared or validated.
+ *              - LZMA_DATA_ERROR: The structures differ.
+ *              - LZMA_OPTIONS_ERROR: version in either structure is greater
+ *                than the maximum supported version (currently zero).
+ *              - LZMA_PROG_ERROR: Invalid value, e.g. invalid check or
+ *                backward_size.
+ */
+extern LZMA_API(lzma_ret) lzma_stream_flags_compare(
+                const lzma_stream_flags *a, const lzma_stream_flags *b)
+                lzma_nothrow lzma_attr_pure;