Mercurial > dovecot > core-2.2
view src/plugins/zlib/ostream-bzlib.c @ 13530:8c3c0e01e00d
Simplified creating filter ostreams.
author | Timo Sirainen <tss@iki.fi> |
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date | Wed, 21 Sep 2011 14:40:35 +0300 |
parents | cf77e448295c |
children | aefc17d5b99e |
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/* Copyright (c) 2010-2011 Dovecot authors, see the included COPYING file */ #include "lib.h" #ifdef HAVE_BZLIB #include "ostream-private.h" #include "ostream-zlib.h" #include <bzlib.h> #define CHUNK_SIZE (1024*64) struct bzlib_ostream { struct ostream_private ostream; bz_stream zs; char outbuf[CHUNK_SIZE]; struct ostream *output; unsigned int flushed:1; }; static void o_stream_bzlib_close(struct iostream_private *stream) { struct bzlib_ostream *zstream = (struct bzlib_ostream *)stream; o_stream_flush(&zstream->ostream.ostream); (void)BZ2_bzCompressEnd(&zstream->zs); } static ssize_t o_stream_bzlib_send_chunk(struct bzlib_ostream *zstream, const void *data, size_t size) { bz_stream *zs = &zstream->zs; ssize_t ret; zs->next_in = (void *)data; zs->avail_in = size; while (zs->avail_in > 0) { if (zs->avail_out == 0) { zs->next_out = zstream->outbuf; zs->avail_out = sizeof(zstream->outbuf); ret = o_stream_send(zstream->ostream.parent, zstream->outbuf, sizeof(zstream->outbuf)); if (ret != (ssize_t)sizeof(zstream->outbuf)) { o_stream_copy_error_from_parent(&zstream->ostream); return -1; } } switch (BZ2_bzCompress(zs, BZ_RUN)) { case BZ_RUN_OK: break; default: i_unreached(); } } zstream->flushed = FALSE; return 0; } static int o_stream_bzlib_send_flush(struct bzlib_ostream *zstream) { bz_stream *zs = &zstream->zs; unsigned int len; bool done = FALSE; int ret; i_assert(zs->avail_in == 0); if (zstream->flushed) return 0; do { len = sizeof(zstream->outbuf) - zs->avail_out; if (len != 0) { zs->next_out = zstream->outbuf; zs->avail_out = sizeof(zstream->outbuf); ret = o_stream_send(zstream->ostream.parent, zstream->outbuf, len); if (ret != (int)len) { o_stream_copy_error_from_parent(&zstream->ostream); return -1; } if (done) break; } ret = BZ2_bzCompress(zs, BZ_FINISH); switch (ret) { case BZ_STREAM_END: done = TRUE; break; case BZ_FINISH_OK: break; default: i_unreached(); } } while (zs->avail_out != sizeof(zstream->outbuf)); zstream->flushed = TRUE; return 0; } static int o_stream_bzlib_flush(struct ostream_private *stream) { struct bzlib_ostream *zstream = (struct bzlib_ostream *)stream; int ret; if (o_stream_bzlib_send_flush(zstream) < 0) return -1; ret = o_stream_flush(stream->parent); if (ret < 0) o_stream_copy_error_from_parent(stream); return ret; } static ssize_t o_stream_bzlib_sendv(struct ostream_private *stream, const struct const_iovec *iov, unsigned int iov_count) { struct bzlib_ostream *zstream = (struct bzlib_ostream *)stream; ssize_t bytes = 0; unsigned int i; for (i = 0; i < iov_count; i++) { if (o_stream_bzlib_send_chunk(zstream, iov[i].iov_base, iov[i].iov_len) < 0) return -1; bytes += iov[i].iov_len; } stream->ostream.offset += bytes; return bytes; } struct ostream *o_stream_create_bz2(struct ostream *output, int level) { struct bzlib_ostream *zstream; int ret; i_assert(level >= 1 && level <= 9); zstream = i_new(struct bzlib_ostream, 1); zstream->ostream.sendv = o_stream_bzlib_sendv; zstream->ostream.flush = o_stream_bzlib_flush; zstream->ostream.iostream.close = o_stream_bzlib_close; ret = BZ2_bzCompressInit(&zstream->zs, level, 0, 0); switch (ret) { case BZ_OK: break; case BZ_MEM_ERROR: i_fatal_status(FATAL_OUTOFMEM, "bzlib: Out of memory"); case BZ_CONFIG_ERROR: i_fatal("Wrong bzlib library version (broken compilation)"); case BZ_PARAM_ERROR: i_fatal("bzlib: Invalid parameters"); default: i_fatal("BZ2_bzCompressInit() failed with %d", ret); } zstream->zs.next_out = zstream->outbuf; zstream->zs.avail_out = sizeof(zstream->outbuf); return o_stream_create(&zstream->ostream, output); } #endif