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JACQUESG / Git-Raw-0.54-TRIAL / deps / libgit2 / src / zstream.c 

            

              
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/*
 * 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 <zlib.h>
#include "zstream.h"
#include "buffer.h"
#define ZSTREAM_BUFFER_SIZE (1024 * 1024)
#define ZSTREAM_BUFFER_MIN_EXTRA 8
static int zstream_seterr(git_zstream *zs)
{
        if (zs->zerr == Z_OK || zs->zerr == Z_STREAM_END)
                return 0;
        if (zs->zerr == Z_MEM_ERROR)
                giterr_set_oom();
        else if (zs->z.msg)
                giterr_set(GITERR_ZLIB, zs->z.msg);
        else
                giterr_set(GITERR_ZLIB, "Unknown compression error");
        return -1;
}
int git_zstream_init(git_zstream *zstream)
{
        zstream->zerr = deflateInit(&zstream->z, Z_DEFAULT_COMPRESSION);
        return zstream_seterr(zstream);
}
void git_zstream_free(git_zstream *zstream)
{
        deflateEnd(&zstream->z);
}
void git_zstream_reset(git_zstream *zstream)
{
        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);
}
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(void *out, size_t *out_len, git_zstream *zstream)
{
        int zflush = Z_FINISH;
        size_t out_remain = *out_len;
        while (out_remain > 0 && zstream->zerr != Z_STREAM_END) {
                size_t out_queued, in_queued, out_used, in_used;
                /* set up in data */
                zstream->z.next_in  = (Bytef *)zstream->in;
                zstream->z.avail_in = (uInt)zstream->in_len;
                if ((size_t)zstream->z.avail_in != zstream->in_len) {
                        zstream->z.avail_in = INT_MAX;
                        zflush = Z_NO_FLUSH;
                } else {
                        zflush = Z_FINISH;
                }
                in_queued = (size_t)zstream->z.avail_in;
                /* set up out data */
                zstream->z.next_out = out;
                zstream->z.avail_out = (uInt)out_remain;
                if ((size_t)zstream->z.avail_out != out_remain)
                        zstream->z.avail_out = INT_MAX;
                out_queued = (size_t)zstream->z.avail_out;
                /* compress next chunk */
                zstream->zerr = deflate(&zstream->z, zflush);
                if (zstream->zerr == Z_STREAM_ERROR)
                        return zstream_seterr(zstream);
                out_used = (out_queued - zstream->z.avail_out);
                out_remain -= out_used;
                out = ((char *)out) + out_used;
                in_used = (in_queued - zstream->z.avail_in);
                zstream->in_len -= in_used;
                zstream->in += in_used;
        }
        /* either we finished the input or we did not flush the data */
        assert(zstream->in_len > 0 || zflush == Z_FINISH);
        /* set out_size to number of bytes actually written to output */
        *out_len = *out_len - out_remain;
        return 0;
}
int git_zstream_deflatebuf(git_buf *out, const void *in, size_t in_len)
{
        git_zstream zs = GIT_ZSTREAM_INIT;
        int error = 0;
        if ((error = git_zstream_init(&zs)) < 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;
}