static int parse_patch_body(
git_patch_parsed *patch, git_patch_parse_ctx *ctx)
{
if (parse_ctx_contains_s(ctx, "GIT binary patch"))
return parse_patch_binary(patch, ctx);
else if (parse_ctx_contains_s(ctx, "Binary files "))
return parse_patch_binary_nodata(patch, ctx);
else
return parse_patch_hunks(patch, ctx);
}
static int parse_patch_header(
git_patch_parsed *patch,
git_patch_parse_ctx *ctx)
{
int error = 0;
for (ctx->line = ctx->remain;
ctx->remain_len > 0;
parse_advance_line(ctx)) {
/* This line is too short to be a patch header. */
if (ctx->line_len < 6)
continue;
/* This might be a hunk header without a patch header, provide a
* sensible error message. */
if (parse_ctx_contains_s(ctx, "@@ -")) {
size_t line_num = ctx->line_num;
git_patch_hunk hunk;
/* If this cannot be parsed as a hunk header, it's just leading
* noise, continue.
*/
if (parse_hunk_header(&hunk, ctx) < 0) {
giterr_clear();
continue;
}
error = parse_err("invalid hunk header outside patch at line %d",
line_num);
goto done;
}
/* This buffer is too short to contain a patch. */
if (ctx->remain_len < ctx->line_len + 6)
break;
/* A proper git patch */
if (parse_ctx_contains_s(ctx, "diff --git ")) {
error = parse_header_git(patch, ctx);
goto done;
}
error = 0;
continue;
}
giterr_set(GITERR_PATCH, "no patch found");
error = GIT_ENOTFOUND;
done:
return error;
}
static int parse_patch_hunks(
git_patch_parsed *patch,
git_patch_parse_ctx *ctx)
{
git_patch_hunk *hunk;
int error = 0;
while (parse_ctx_contains_s(ctx, "@@ -")) {
hunk = git_array_alloc(patch->base.hunks);
GITERR_CHECK_ALLOC(hunk);
memset(hunk, 0, sizeof(git_patch_hunk));
hunk->line_start = git_array_size(patch->base.lines);
hunk->line_count = 0;
if ((error = parse_hunk_header(hunk, ctx)) < 0 ||
(error = parse_hunk_body(patch, hunk, ctx)) < 0)
goto done;
}
patch->base.delta->flags |= GIT_DIFF_FLAG_NOT_BINARY;
done:
return error;
}
static int parse_patch_binary_side(
git_diff_binary_file *binary,
git_patch_parse_ctx *ctx)
{
git_diff_binary_t type = GIT_DIFF_BINARY_NONE;
git_buf base85 = GIT_BUF_INIT, decoded = GIT_BUF_INIT;
git_off_t len;
int error = 0;
if (parse_ctx_contains_s(ctx, "literal ")) {
type = GIT_DIFF_BINARY_LITERAL;
parse_advance_chars(ctx, 8);
} else if (parse_ctx_contains_s(ctx, "delta ")) {
type = GIT_DIFF_BINARY_DELTA;
parse_advance_chars(ctx, 6);
} else {
error = parse_err(
"unknown binary delta type at line %d", ctx->line_num);
goto done;
}
if (parse_number(&len, ctx) < 0 || parse_advance_nl(ctx) < 0 || len < 0) {
error = parse_err("invalid binary size at line %d", ctx->line_num);
goto done;
}
while (ctx->line_len) {
char c = ctx->line[0];
size_t encoded_len, decoded_len = 0, decoded_orig = decoded.size;
if (c == '\n')
break;
else if (c >= 'A' && c <= 'Z')
decoded_len = c - 'A' + 1;
else if (c >= 'a' && c <= 'z')
decoded_len = c - 'a' + (('z' - 'a') + 1) + 1;
if (!decoded_len) {
error = parse_err("invalid binary length at line %d", ctx->line_num);
goto done;
}
parse_advance_chars(ctx, 1);
encoded_len = ((decoded_len / 4) + !!(decoded_len % 4)) * 5;
if (encoded_len > ctx->line_len - 1) {
error = parse_err("truncated binary data at line %d", ctx->line_num);
goto done;
}
if ((error = git_buf_decode_base85(
&decoded, ctx->line, encoded_len, decoded_len)) < 0)
goto done;
if (decoded.size - decoded_orig != decoded_len) {
error = parse_err("truncated binary data at line %d", ctx->line_num);
goto done;
}
parse_advance_chars(ctx, encoded_len);
if (parse_advance_nl(ctx) < 0) {
error = parse_err("trailing data at line %d", ctx->line_num);
goto done;
}
}
binary->type = type;
binary->inflatedlen = (size_t)len;
binary->datalen = decoded.size;
binary->data = git_buf_detach(&decoded);
done:
git_buf_free(&base85);
git_buf_free(&decoded);
return error;
}
static int parse_hunk_body(
git_patch_parsed *patch,
git_patch_hunk *hunk,
git_patch_parse_ctx *ctx)
{
git_diff_line *line;
int error = 0;
int oldlines = hunk->hunk.old_lines;
int newlines = hunk->hunk.new_lines;
for (;
ctx->remain_len > 4 && (oldlines || newlines) &&
memcmp(ctx->line, "@@ -", 4) != 0;
parse_advance_line(ctx)) {
int origin;
int prefix = 1;
if (ctx->line_len == 0 || ctx->line[ctx->line_len - 1] != '\n') {
error = parse_err("invalid patch instruction at line %d",
ctx->line_num);
goto done;
}
switch (ctx->line[0]) {
case '\n':
prefix = 0;
case ' ':
origin = GIT_DIFF_LINE_CONTEXT;
oldlines--;
newlines--;
break;
case '-':
origin = GIT_DIFF_LINE_DELETION;
oldlines--;
break;
case '+':
origin = GIT_DIFF_LINE_ADDITION;
newlines--;
break;
default:
error = parse_err("invalid patch hunk at line %d", ctx->line_num);
goto done;
}
line = git_array_alloc(patch->base.lines);
GITERR_CHECK_ALLOC(line);
memset(line, 0x0, sizeof(git_diff_line));
line->content = ctx->line + prefix;
line->content_len = ctx->line_len - prefix;
line->content_offset = ctx->content_len - ctx->remain_len;
line->origin = origin;
hunk->line_count++;
}
if (oldlines || newlines) {
error = parse_err(
"invalid patch hunk, expected %d old lines and %d new lines",
hunk->hunk.old_lines, hunk->hunk.new_lines);
goto done;
}
/* Handle "\ No newline at end of file". Only expect the leading
* backslash, though, because the rest of the string could be
* localized. Because `diff` optimizes for the case where you
* want to apply the patch by hand.
*/
if (parse_ctx_contains_s(ctx, "\\ ") &&
git_array_size(patch->base.lines) > 0) {
line = git_array_get(patch->base.lines, git_array_size(patch->base.lines) - 1);
if (line->content_len < 1) {
error = parse_err("cannot trim trailing newline of empty line");
goto done;
}
line->content_len--;
parse_advance_line(ctx);
}
done:
return error;
}
