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ext/zstd/contrib/seekable_format/zstd_seekable.h  view on Meta::CPAN

*  There are three modes for ZSTD_seekable_init:
*    - ZSTD_seekable_initBuff() : An in-memory API.  The data contained in
*      `src` should be the entire seekable file, including the seek table.
*      `src` should be kept alive and unmodified until the ZSTD_seekable object
*      is freed or reset.
*    - ZSTD_seekable_initFile() : A simplified file API using stdio.  fread and
*      fseek will be used to access the required data for building the seek
*      table and doing decompression operations.  `src` should not be closed
*      or modified until the ZSTD_seekable object is freed or reset.
*    - ZSTD_seekable_initAdvanced() : A general API allowing the client to
*      provide its own read and seek callbacks.
*        + ZSTD_seekable_read() : read exactly `n` bytes into `buffer`.
*                                 Premature EOF should be treated as an error.
*        + ZSTD_seekable_seek() : seek the read head to `offset` from `origin`,
*                                 where origin is either SEEK_SET (beginning of
*                                 file), or SEEK_END (end of file).
*  Both functions should return a non-negative value in case of success, and a
*  negative value in case of failure.  If implementing using this API and
*  stdio, be careful with files larger than 4GB and fseek.  All of these
*  functions return an error code checkable with ZSTD_isError().
*

ext/zstd/contrib/seekable_format/zstdseek_decompress.c  view on Meta::CPAN

#undef ERROR
#define ERROR(name) ((size_t)-ZSTD_error_##name)

#define CHECK_IO(f) { int const errcod = (f); if (errcod < 0) return ERROR(seekableIO); }

#undef MIN
#undef MAX
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define MAX(a, b) ((a) > (b) ? (a) : (b))

/* Special-case callbacks for FILE* and in-memory modes, so that we can treat
 * them the same way as the advanced API */
static int ZSTD_seekable_read_FILE(void* opaque, void* buffer, size_t n)
{
    size_t const result = fread(buffer, 1, n, (FILE*)opaque);
    if (result != n) {
        return -1;
    }
    return 0;
}