diff options
Diffstat (limited to 'src/zstream.c')
| -rw-r--r-- | src/zstream.c | 210 |
1 files changed, 0 insertions, 210 deletions
diff --git a/src/zstream.c b/src/zstream.c deleted file mode 100644 index a5675676e..000000000 --- a/src/zstream.c +++ /dev/null @@ -1,210 +0,0 @@ -/* - * Copyright (C) the libgit2 contributors. All rights reserved. - * - * This file is part of libgit2, distributed under the GNU GPL v2 with - * a Linking Exception. For full terms see the included COPYING file. - */ - -#include "zstream.h" - -#include <zlib.h> - -#include "buffer.h" - -#define ZSTREAM_BUFFER_SIZE (1024 * 1024) -#define ZSTREAM_BUFFER_MIN_EXTRA 8 - -GIT_INLINE(int) zstream_seterr(git_zstream *zs) -{ - switch (zs->zerr) { - case Z_OK: - case Z_STREAM_END: - case Z_BUF_ERROR: /* not fatal; we retry with a larger buffer */ - return 0; - case Z_MEM_ERROR: - git_error_set_oom(); - break; - default: - if (zs->z.msg) - git_error_set_str(GIT_ERROR_ZLIB, zs->z.msg); - else - git_error_set(GIT_ERROR_ZLIB, "unknown compression error"); - } - - return -1; -} - -int git_zstream_init(git_zstream *zstream, git_zstream_t type) -{ - zstream->type = type; - - if (zstream->type == GIT_ZSTREAM_INFLATE) - zstream->zerr = inflateInit(&zstream->z); - else - zstream->zerr = deflateInit(&zstream->z, Z_DEFAULT_COMPRESSION); - return zstream_seterr(zstream); -} - -void git_zstream_free(git_zstream *zstream) -{ - if (zstream->type == GIT_ZSTREAM_INFLATE) - inflateEnd(&zstream->z); - else - deflateEnd(&zstream->z); -} - -void git_zstream_reset(git_zstream *zstream) -{ - if (zstream->type == GIT_ZSTREAM_INFLATE) - inflateReset(&zstream->z); - else - deflateReset(&zstream->z); - zstream->in = NULL; - zstream->in_len = 0; - zstream->zerr = Z_STREAM_END; -} - -int git_zstream_set_input(git_zstream *zstream, const void *in, size_t in_len) -{ - zstream->in = in; - zstream->in_len = in_len; - zstream->zerr = Z_OK; - return 0; -} - -bool git_zstream_done(git_zstream *zstream) -{ - return (!zstream->in_len && zstream->zerr == Z_STREAM_END); -} - -bool git_zstream_eos(git_zstream *zstream) -{ - return zstream->zerr == Z_STREAM_END; -} - -size_t git_zstream_suggest_output_len(git_zstream *zstream) -{ - if (zstream->in_len > ZSTREAM_BUFFER_SIZE) - return ZSTREAM_BUFFER_SIZE; - else if (zstream->in_len > ZSTREAM_BUFFER_MIN_EXTRA) - return zstream->in_len; - else - return ZSTREAM_BUFFER_MIN_EXTRA; -} - -int git_zstream_get_output_chunk( - void *out, size_t *out_len, git_zstream *zstream) -{ - size_t in_queued, in_used, out_queued; - - /* set up input data */ - zstream->z.next_in = (Bytef *)zstream->in; - - /* feed as much data to zlib as it can consume, at most UINT_MAX */ - if (zstream->in_len > UINT_MAX) { - zstream->z.avail_in = UINT_MAX; - zstream->flush = Z_NO_FLUSH; - } else { - zstream->z.avail_in = (uInt)zstream->in_len; - zstream->flush = Z_FINISH; - } - in_queued = (size_t)zstream->z.avail_in; - - /* set up output data */ - zstream->z.next_out = out; - zstream->z.avail_out = (uInt)*out_len; - - if ((size_t)zstream->z.avail_out != *out_len) - zstream->z.avail_out = UINT_MAX; - out_queued = (size_t)zstream->z.avail_out; - - /* compress next chunk */ - if (zstream->type == GIT_ZSTREAM_INFLATE) - zstream->zerr = inflate(&zstream->z, zstream->flush); - else - zstream->zerr = deflate(&zstream->z, zstream->flush); - - if (zstream_seterr(zstream)) - return -1; - - in_used = (in_queued - zstream->z.avail_in); - zstream->in_len -= in_used; - zstream->in += in_used; - - *out_len = (out_queued - zstream->z.avail_out); - - return 0; -} - -int git_zstream_get_output(void *out, size_t *out_len, git_zstream *zstream) -{ - size_t out_remain = *out_len; - - if (zstream->in_len && zstream->zerr == Z_STREAM_END) { - git_error_set(GIT_ERROR_ZLIB, "zlib input had trailing garbage"); - return -1; - } - - while (out_remain > 0 && zstream->zerr != Z_STREAM_END) { - size_t out_written = out_remain; - - if (git_zstream_get_output_chunk(out, &out_written, zstream) < 0) - return -1; - - out_remain -= out_written; - out = ((char *)out) + out_written; - } - - /* either we finished the input or we did not flush the data */ - GIT_ASSERT(zstream->in_len > 0 || zstream->flush == Z_FINISH); - - /* set out_size to number of bytes actually written to output */ - *out_len = *out_len - out_remain; - - return 0; -} - -static int zstream_buf(git_buf *out, const void *in, size_t in_len, git_zstream_t type) -{ - git_zstream zs = GIT_ZSTREAM_INIT; - int error = 0; - - if ((error = git_zstream_init(&zs, type)) < 0) - return error; - - if ((error = git_zstream_set_input(&zs, in, in_len)) < 0) - goto done; - - while (!git_zstream_done(&zs)) { - size_t step = git_zstream_suggest_output_len(&zs), written; - - if ((error = git_buf_grow_by(out, step)) < 0) - goto done; - - written = out->asize - out->size; - - if ((error = git_zstream_get_output( - out->ptr + out->size, &written, &zs)) < 0) - goto done; - - out->size += written; - } - - /* NULL terminate for consistency if possible */ - if (out->size < out->asize) - out->ptr[out->size] = '\0'; - -done: - git_zstream_free(&zs); - return error; -} - -int git_zstream_deflatebuf(git_buf *out, const void *in, size_t in_len) -{ - return zstream_buf(out, in, in_len, GIT_ZSTREAM_DEFLATE); -} - -int git_zstream_inflatebuf(git_buf *out, const void *in, size_t in_len) -{ - return zstream_buf(out, in, in_len, GIT_ZSTREAM_INFLATE); -} |