/*
* Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/queue.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sha1.h>
#include <zlib.h>
#include "got_error.h"
#include "got_object.h"
#include "got_path_lib.h"
#include "got_zbuf_lib.h"
const struct got_error *
got_inflate_init(struct got_zstream_buf *zb, size_t bufsize)
{
const struct got_error *err = NULL;
memset(zb, 0, sizeof(*zb));
zb->z.zalloc = Z_NULL;
zb->z.zfree = Z_NULL;
if (inflateInit(&zb->z) != Z_OK) {
err = got_error(GOT_ERR_IO);
goto done;
}
zb->inlen = zb->outlen = bufsize;
zb->inbuf = calloc(1, zb->inlen);
if (zb->inbuf == NULL) {
err = got_error(GOT_ERR_NO_MEM);
goto done;
}
zb->outbuf = calloc(1, zb->outlen);
if (zb->outbuf == NULL) {
err = got_error(GOT_ERR_NO_MEM);
goto done;
}
done:
if (err)
got_inflate_end(zb);
return err;
}
const struct got_error *
got_inflate_read(struct got_zstream_buf *zb, FILE *f, size_t *outlenp)
{
size_t last_total_out = zb->z.total_out;
z_stream *z = &zb->z;
int ret;
z->next_out = zb->outbuf;
z->avail_out = zb->outlen;
*outlenp = 0;
do {
if (z->avail_in == 0) {
size_t n = fread(zb->inbuf, 1, zb->inlen, f);
if (n == 0) {
if (ferror(f))
return got_ferror(f, GOT_ERR_IO);
break; /* EOF */
}
z->next_in = zb->inbuf;
z->avail_in = n;
}
ret = inflate(z, Z_SYNC_FLUSH);
} while (ret == Z_OK && z->avail_out > 0);
if (ret == Z_OK) {
zb->flags |= GOT_ZSTREAM_F_HAVE_MORE;
} else {
if (ret != Z_STREAM_END)
return got_error(GOT_ERR_DECOMPRESSION);
zb->flags &= ~GOT_ZSTREAM_F_HAVE_MORE;
}
*outlenp = z->total_out - last_total_out;
return NULL;
}
void
got_inflate_end(struct got_zstream_buf *zb)
{
free(zb->inbuf);
free(zb->outbuf);
inflateEnd(&zb->z);
}
const struct got_error *
got_inflate_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
{
const struct got_error *err;
size_t avail;
struct got_zstream_buf zb;
void *newbuf;
err = got_inflate_init(&zb, 8192);
if (err)
return err;
*outbuf = NULL;
*outlen = 0;
do {
err = got_inflate_read(&zb, f, &avail);
if (err)
return err;
if (avail > 0) {
newbuf = reallocarray(*outbuf, 1, *outlen + avail);
if (newbuf == NULL) {
free(*outbuf);
*outbuf = NULL;
*outlen = 0;
err = got_error(GOT_ERR_NO_MEM);
goto done;
}
memcpy(newbuf + *outlen, zb.outbuf, avail);
*outbuf = newbuf;
*outlen += avail;
}
} while (zb.flags & GOT_ZSTREAM_F_HAVE_MORE);
done:
got_inflate_end(&zb);
return err;
}
const struct got_error *
got_inflate_to_file(size_t *outlen, FILE *infile, FILE *outfile)
{
const struct got_error *err;
size_t avail;
struct got_zstream_buf zb;
err = got_inflate_init(&zb, 8192);
if (err)
goto done;
*outlen = 0;
do {
err = got_inflate_read(&zb, infile, &avail);
if (err)
return err;
if (avail > 0) {
size_t n;
n = fwrite(zb.outbuf, avail, 1, outfile);
if (n != 1) {
err = got_ferror(outfile, GOT_ERR_IO);
goto done;
}
*outlen += avail;
}
} while (zb.flags & GOT_ZSTREAM_F_HAVE_MORE);
done:
if (err == NULL)
rewind(outfile);
got_inflate_end(&zb);
return err;
}
