thodg/libgit2/src/filter.c

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• Hash : 9587895f
  Author :
  Date : 2012-07-16T12:06:23
  

  Migrate code to git_filter_blob_contents. Also removes the unnecessary check for filter length, since git_filters_apply does the right thing when there are none, and it's more efficient than this.

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• src/filter.c

• /*
   * Copyright (C) 2009-2012 the libgit2 contributors
   *
   * 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 "common.h"
  #include "fileops.h"
  #include "hash.h"
  #include "filter.h"
  #include "repository.h"
  #include "git2/config.h"
  #include "blob.h"
  
  /* Tweaked from Core Git. I wonder what we could use this for... */
  void git_text_gather_stats(git_text_stats *stats, const git_buf *text)
  {
  	size_t i;
  
  	memset(stats, 0, sizeof(*stats));
  
  	for (i = 0; i < git_buf_len(text); i++) {
  		unsigned char c = text->ptr[i];
  
  		if (c == '\r') {
  			stats->cr++;
  
  			if (i + 1 < git_buf_len(text) && text->ptr[i + 1] == '\n')
  				stats->crlf++;
  		}
  
  		else if (c == '\n')
  			stats->lf++;
  
  		else if (c == 0x85)
  			/* Unicode CR+LF */
  			stats->crlf++;
  
  		else if (c == 127)
  			/* DEL */
  			stats->nonprintable++;
  
  		else if (c <= 0x1F || (c >= 0x80 && c <= 0x9F)) {
  			switch (c) {
  				/* BS, HT, ESC and FF */
  			case '\b': case '\t': case '\033': case '\014':
  				stats->printable++;
  				break;
  			case 0:
  				stats->nul++;
  				/* fall through */
  			default:
  				stats->nonprintable++;
  			}
  		}
  
  		else
  			stats->printable++;
  	}
  
  	/* If file ends with EOF then don't count this EOF as non-printable. */
  	if (git_buf_len(text) >= 1 && text->ptr[text->size - 1] == '\032')
  		stats->nonprintable--;
  }
  
  /*
   * Fresh from Core Git
   */
  int git_text_is_binary(git_text_stats *stats)
  {
  	if (stats->nul)
  		return 1;
  
  	if ((stats->printable >> 7) < stats->nonprintable)
  		return 1;
  	/*
  	 * Other heuristics? Average line length might be relevant,
  	 * as might LF vs CR vs CRLF counts..
  	 *
  	 * NOTE! It might be normal to have a low ratio of CRLF to LF
  	 * (somebody starts with a LF-only file and edits it with an editor
  	 * that adds CRLF only to lines that are added..). But do  we
  	 * want to support CR-only? Probably not.
  	 */
  	return 0;
  }
  
  int git_filters_load(git_vector *filters, git_repository *repo, const char *path, int mode)
  {
  	int error;
  
  	if (mode == GIT_FILTER_TO_ODB) {
  		/* Load the CRLF cleanup filter when writing to the ODB */
  		error = git_filter_add__crlf_to_odb(filters, repo, path);
  		if (error < 0)
  			return error;
  	} else {
  		error = git_filter_add__crlf_to_workdir(filters, repo, path);
  		if (error < 0)
  			return error;
  	}
  
  	return (int)filters->length;
  }
  
  void git_filters_free(git_vector *filters)
  {
  	size_t i;
  	git_filter *filter;
  
  	git_vector_foreach(filters, i, filter) {
  		if (filter->do_free != NULL)
  			filter->do_free(filter);
  		else
  			git__free(filter);
  	}
  
  	git_vector_free(filters);
  }
  
  int git_filters_apply(git_buf *dest, git_buf *source, git_vector *filters)
  {
  	unsigned int i, src;
  	git_buf *dbuffer[2];
  
  	dbuffer[0] = source;
  	dbuffer[1] = dest;
  
  	src = 0;
  
  	if (git_buf_len(source) == 0) {
  		git_buf_clear(dest);
  		return 0;
  	}
  
  	/* Pre-grow the destination buffer to more or less the size
  	 * we expect it to have */
  	if (git_buf_grow(dest, git_buf_len(source)) < 0)
  		return -1;
  
  	for (i = 0; i < filters->length; ++i) {
  		git_filter *filter = git_vector_get(filters, i);
  		unsigned int dst = 1 - src;
  
  		git_buf_clear(dbuffer[dst]);
  
  		/* Apply the filter from dbuffer[src] to the other buffer;
  		 * if the filtering is canceled by the user mid-filter,
  		 * we skip to the next filter without changing the source
  		 * of the double buffering (so that the text goes through
  		 * cleanly).
  		 */
  		if (filter->apply(filter, dbuffer[dst], dbuffer[src]) == 0)
  			src = dst;
  
  		if (git_buf_oom(dbuffer[dst]))
  			return -1;
  	}
  
  	/* Ensure that the output ends up in dbuffer[1] (i.e. the dest) */
  	if (src != 1)
  		git_buf_swap(dest, source);
  
  	return 0;
  }
  
  static int unfiltered_blob_contents(git_buf *out, git_repository *repo, const git_oid *blob_id)
  {
  	int retcode = GIT_ERROR;
  	git_blob *blob;
  
  	if (!(retcode = git_blob_lookup(&blob, repo, blob_id)))
  		retcode = git_blob__getbuf(out, blob);
  
  	return retcode;
  }
  
  int git_filter_blob_contents(git_buf *out, git_repository *repo, const git_oid *oid, const char *path)
  {
  	int retcode = GIT_ERROR;
  
  	git_buf unfiltered = GIT_BUF_INIT;
  	if (!unfiltered_blob_contents(&unfiltered, repo, oid)) {
  		git_vector filters = GIT_VECTOR_INIT;
  		if (git_filters_load(&filters,
  									repo, path, GIT_FILTER_TO_WORKTREE) >= 0) {
  			git_buf_clear(out);
  			retcode = git_filters_apply(out, &unfiltered, &filters);
  		}
  
  		git_filters_free(&filters);
  	}
  
  	git_buf_free(&unfiltered);
  	return retcode;
  }
  
  

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