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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 "git2/errors.h"

#include "common.h"

#include "diff.h"

#include "diff_driver.h"

#include "diff_xdiff.h"

#include "patch_generate.h"

static int git_xdiff_scan_int(const char **str, int *value)

{

const char *scan = *str;

int v = 0, digits = 0;

/* find next digit */

for (scan = *str; *scan && !git__isdigit(*scan); scan++);

/* parse next number */

for (; git__isdigit(*scan); scan++, digits++)

v = (v * 10) + (*scan - '0');

*str = scan;

*value = v;

return (digits > 0) ? 0 : -1;

}

static int git_xdiff_parse_hunk(git_diff_hunk *hunk, const char *header)

{

/* expect something of the form "@@ -%d[,%d] +%d[,%d] @@" */

if (*header != '@')

goto fail;

if (git_xdiff_scan_int(&header, &hunk->old_start) < 0)

goto fail;

if (*header == ',') {

if (git_xdiff_scan_int(&header, &hunk->old_lines) < 0)

goto fail;

} else

hunk->old_lines = 1;

if (git_xdiff_scan_int(&header, &hunk->new_start) < 0)

goto fail;

if (*header == ',') {

if (git_xdiff_scan_int(&header, &hunk->new_lines) < 0)

goto fail;

} else

hunk->new_lines = 1;

if (hunk->old_start < 0 || hunk->new_start < 0)

goto fail;

return 0;

fail:

giterr_set(GITERR_INVALID, "malformed hunk header from xdiff");

return -1;

}

typedef struct {

git_xdiff_output *xo;

git_patch_generated *patch;

git_diff_hunk hunk;

int old_lineno, new_lineno;

mmfile_t xd_old_data, xd_new_data;

} git_xdiff_info;

static int diff_update_lines(

git_xdiff_info *info,

git_diff_line *line,

const char *content,

size_t content_len)

{

const char *scan = content, *scan_end = content + content_len;

for (line->num_lines = 0; scan < scan_end; ++scan)

if (*scan == '\n')

++line->num_lines;

line->content = content;

line->content_len = content_len;

/* expect " "/"-"/"+", then data */

switch (line->origin) {

case GIT_DIFF_LINE_ADDITION:

case GIT_DIFF_LINE_DEL_EOFNL:

line->old_lineno = -1;

line->new_lineno = info->new_lineno;

info->new_lineno += (int)line->num_lines;

break;

case GIT_DIFF_LINE_DELETION:

case GIT_DIFF_LINE_ADD_EOFNL:

line->old_lineno = info->old_lineno;

line->new_lineno = -1;

info->old_lineno += (int)line->num_lines;

break;

case GIT_DIFF_LINE_CONTEXT:

case GIT_DIFF_LINE_CONTEXT_EOFNL:

line->old_lineno = info->old_lineno;

line->new_lineno = info->new_lineno;

info->old_lineno += (int)line->num_lines;

info->new_lineno += (int)line->num_lines;

break;

default:

giterr_set(GITERR_INVALID, "unknown diff line origin %02x",

(unsigned int)line->origin);

return -1;

}

return 0;

}

static int git_xdiff_cb(void *priv, mmbuffer_t *bufs, int len)

{

git_xdiff_info *info = priv;

git_patch_generated *patch = info->patch;

const git_diff_delta *delta = patch->base.delta;

git_patch_generated_output *output = &info->xo->output;

git_diff_line line;

if (len == 1) {

output->error = git_xdiff_parse_hunk(&info->hunk, bufs[0].ptr);

if (output->error < 0)

return output->error;

info->hunk.header_len = bufs[0].size;

if (info->hunk.header_len >= sizeof(info->hunk.header))

info->hunk.header_len = sizeof(info->hunk.header) - 1;

memcpy(info->hunk.header, bufs[0].ptr, info->hunk.header_len);

info->hunk.header[info->hunk.header_len] = '\0';

if (output->hunk_cb != NULL &&

(output->error = output->hunk_cb(

delta, &info->hunk, output->payload)))

return output->error;

info->old_lineno = info->hunk.old_start;

info->new_lineno = info->hunk.new_start;

}

if (len == 2 || len == 3) {

/* expect " "/"-"/"+", then data */

line.origin =

(*bufs[0].ptr == '+') ? GIT_DIFF_LINE_ADDITION :

(*bufs[0].ptr == '-') ? GIT_DIFF_LINE_DELETION :

GIT_DIFF_LINE_CONTEXT;

if (line.origin == GIT_DIFF_LINE_ADDITION)

line.content_offset = bufs[1].ptr - info->xd_new_data.ptr;

else if (line.origin == GIT_DIFF_LINE_DELETION)

line.content_offset = bufs[1].ptr - info->xd_old_data.ptr;

else

line.content_offset = -1;

output->error = diff_update_lines(

info, &line, bufs[1].ptr, bufs[1].size);

if (!output->error && output->data_cb != NULL)

output->error = output->data_cb(

delta, &info->hunk, &line, output->payload);

}

if (len == 3 && !output->error) {

/* If we have a '+' and a third buf, then we have added a line

* without a newline and the old code had one, so DEL_EOFNL.

* If we have a '-' and a third buf, then we have removed a line

* with out a newline but added a blank line, so ADD_EOFNL.

*/

line.origin =

(*bufs[0].ptr == '+') ? GIT_DIFF_LINE_DEL_EOFNL :

(*bufs[0].ptr == '-') ? GIT_DIFF_LINE_ADD_EOFNL :

GIT_DIFF_LINE_CONTEXT_EOFNL;

line.content_offset = -1;

output->error = diff_update_lines(

info, &line, bufs[2].ptr, bufs[2].size);

if (!output->error && output->data_cb != NULL)

output->error = output->data_cb(

delta, &info->hunk, &line, output->payload);

}

return output->error;

}

static int git_xdiff(git_patch_generated_output *output, git_patch_generated *patch)

{

git_xdiff_output *xo = (git_xdiff_output *)output;

git_xdiff_info info;

git_diff_find_context_payload findctxt;

memset(&info, 0, sizeof(info));

info.patch = patch;

info.xo = xo;

xo->callback.priv = &info;

git_diff_find_context_init(

&xo->config.find_func, &findctxt, git_patch_generated_driver(patch));

xo->config.find_func_priv = &findctxt;

if (xo->config.find_func != NULL)

xo->config.flags |= XDL_EMIT_FUNCNAMES;

else

xo->config.flags &= ~XDL_EMIT_FUNCNAMES;

/* TODO: check ofile.opts_flags to see if driver-specific per-file

* updates are needed to xo->params.flags

*/

git_patch_generated_old_data(&info.xd_old_data.ptr, &info.xd_old_data.size, patch);

git_patch_generated_new_data(&info.xd_new_data.ptr, &info.xd_new_data.size, patch);

if (info.xd_old_data.size > GIT_XDIFF_MAX_SIZE ||

info.xd_new_data.size > GIT_XDIFF_MAX_SIZE) {

giterr_set(GITERR_INVALID, "files too large for diff");

return -1;

}

xdl_diff(&info.xd_old_data, &info.xd_new_data,

&xo->params, &xo->config, &xo->callback);

git_diff_find_context_clear(&findctxt);

return xo->output.error;

}

void git_xdiff_init(git_xdiff_output *xo, const git_diff_options *opts)

{

uint32_t flags = opts ? opts->flags : 0;

xo->output.diff_cb = git_xdiff;

xo->config.ctxlen = opts ? opts->context_lines : 3;

xo->config.interhunkctxlen = opts ? opts->interhunk_lines : 0;

if (flags & GIT_DIFF_IGNORE_WHITESPACE)

xo->params.flags |= XDF_WHITESPACE_FLAGS;

if (flags & GIT_DIFF_IGNORE_WHITESPACE_CHANGE)

xo->params.flags |= XDF_IGNORE_WHITESPACE_CHANGE;

if (flags & GIT_DIFF_IGNORE_WHITESPACE_EOL)

xo->params.flags |= XDF_IGNORE_WHITESPACE_AT_EOL;

if (flags & GIT_DIFF_PATIENCE)

xo->params.flags |= XDF_PATIENCE_DIFF;

if (flags & GIT_DIFF_MINIMAL)

xo->params.flags |= XDF_NEED_MINIMAL;

xo->callback.outf = git_xdiff_cb;

}