static int parse_patch_binary(
git_patch_parsed *patch,
git_patch_parse_ctx *ctx)
{
int error;
if (parse_advance_expected_s(ctx, "GIT binary patch") < 0 ||
parse_advance_nl(ctx) < 0)
return parse_err("corrupt git binary header at line %d", ctx->line_num);
/* parse old->new binary diff */
if ((error = parse_patch_binary_side(
&patch->base.binary.new_file, ctx)) < 0)
return error;
if (parse_advance_nl(ctx) < 0)
return parse_err("corrupt git binary separator at line %d",
ctx->line_num);
/* parse new->old binary diff */
if ((error = parse_patch_binary_side(
&patch->base.binary.old_file, ctx)) < 0)
return error;
if (parse_advance_nl(ctx) < 0)
return parse_err("corrupt git binary patch separator at line %d",
ctx->line_num);
patch->base.delta->flags |= GIT_DIFF_FLAG_BINARY;
return 0;
}
static int parse_patch_binary_nodata(
git_patch_parsed *patch,
git_patch_parse_ctx *ctx)
{
if (parse_advance_expected_str(ctx, "Binary files ") < 0 ||
parse_advance_expected_str(ctx, patch->header_old_path) < 0 ||
parse_advance_expected_str(ctx, " and ") < 0 ||
parse_advance_expected_str(ctx, patch->header_new_path) < 0 ||
parse_advance_expected_str(ctx, " differ") < 0 ||
parse_advance_nl(ctx) < 0)
return parse_err("corrupt git binary header at line %"PRIuZ, ctx->line_num);
patch->base.binary.contains_data = 0;
patch->base.delta->flags |= GIT_DIFF_FLAG_BINARY;
return 0;
}
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;
}