thodg/got/lib/deflate.c

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• Hash : 324d37e7
  Author :
  Date : 2019-05-11T09:14:30
  

  make got path APIs available to library consumers

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• lib/deflate.c

• /*
   * Copyright (c) 2019 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 <errno.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <sha1.h>
  #include <zlib.h>
  #include <time.h>
  
  #include "got_error.h"
  #include "got_object.h"
  #include "got_path.h"
  
  #include "got_lib_deflate.h"
  
  #ifndef MIN
  #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
  #endif
  
  const struct got_error *
  got_deflate_init(struct got_deflate_buf *zb, uint8_t *outbuf, size_t bufsize)
  {
  	const struct got_error *err = NULL;
  	int zerr;
  
  	memset(&zb->z, 0, sizeof(zb->z));
  
  	zb->z.zalloc = Z_NULL;
  	zb->z.zfree = Z_NULL;
  	zerr = deflateInit(&zb->z, Z_DEFAULT_COMPRESSION);
  	if (zerr != Z_OK) {
  		if  (zerr == Z_ERRNO)
  			return got_error_from_errno();
  		if  (zerr == Z_MEM_ERROR) {
  			errno = ENOMEM;
  			return got_error_from_errno();
  		}
  		return got_error(GOT_ERR_COMPRESSION);
  	}
  
  	zb->inlen = zb->outlen = bufsize;
  
  	zb->inbuf = calloc(1, zb->inlen);
  	if (zb->inbuf == NULL) {
  		err = got_error_from_errno();
  		goto done;
  	}
  
  	zb->flags = 0;
  	if (outbuf == NULL) {
  		zb->outbuf = calloc(1, zb->outlen);
  		if (zb->outbuf == NULL) {
  			err = got_error_from_errno();
  			goto done;
  		}
  		zb->flags |= GOT_DEFLATE_F_OWN_OUTBUF;
  	} else
  		zb->outbuf = outbuf;
  
  done:
  	if (err)
  		got_deflate_end(zb);
  	return err;
  }
  
  const struct got_error *
  got_deflate_read(struct got_deflate_buf *zb, FILE *f, size_t *outlenp)
  {
  	size_t last_total_out = zb->z.total_out;
  	z_stream *z = &zb->z;
  	int ret = Z_ERRNO;
  
  	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);
  				/* EOF */
  				ret = deflate(z, Z_FINISH);
  				break;
  			}
  			z->next_in = zb->inbuf;
  			z->avail_in = n;
  		}
  		ret = deflate(z, Z_NO_FLUSH);
  	} while (ret == Z_OK && z->avail_out > 0);
  
  	if (ret == Z_OK) {
  		zb->flags |= GOT_DEFLATE_F_HAVE_MORE;
  	} else {
  		if (ret != Z_STREAM_END)
  			return got_error(GOT_ERR_COMPRESSION);
  		zb->flags &= ~GOT_DEFLATE_F_HAVE_MORE;
  	}
  
  	*outlenp = z->total_out - last_total_out;
  	return NULL;
  }
  
  void
  got_deflate_end(struct got_deflate_buf *zb)
  {
  	free(zb->inbuf);
  	if (zb->flags & GOT_DEFLATE_F_OWN_OUTBUF)
  		free(zb->outbuf);
  	deflateEnd(&zb->z);
  }
  
  const struct got_error *
  got_deflate_to_file(size_t *outlen, FILE *infile, FILE *outfile)
  {
  	const struct got_error *err;
  	size_t avail;
  	struct got_deflate_buf zb;
  
  	err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
  	if (err)
  		goto done;
  
  	*outlen = 0;
  
  	do {
  		err = got_deflate_read(&zb, infile, &avail);
  		if (err)
  			goto done;
  		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_DEFLATE_F_HAVE_MORE);
  
  done:
  	if (err == NULL)
  		rewind(outfile);
  	got_deflate_end(&zb);
  	return err;
  }
  

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