void test_core_buffer__decode_base85_fails_gracefully(void)
{
git_buf buf = GIT_BUF_INIT;
git_buf_puts(&buf, "foobar");
cl_git_fail(git_buf_decode_base85(&buf, "invalid charsZZ", 15, 42));
cl_git_fail(git_buf_decode_base85(&buf, "invalidchars__ ", 15, 42));
cl_git_fail(git_buf_decode_base85(&buf, "overflowZZ~~~~~", 15, 42));
cl_git_fail(git_buf_decode_base85(&buf, "truncated", 9, 42));
cl_assert_equal_sz(6, buf.size);
cl_assert_equal_s("foobar", buf.ptr);
git_buf_free(&buf);
}
void test_core_buffer__decode_base85(void)
{
git_buf buf = GIT_BUF_INIT;
cl_git_pass(git_buf_decode_base85(&buf, "bZBXF", 5, 4));
cl_assert_equal_sz(4, buf.size);
cl_assert_equal_s("this", buf.ptr);
git_buf_clear(&buf);
cl_git_pass(git_buf_decode_base85(&buf, "ba!tca&BaE", 10, 8));
cl_assert_equal_sz(8, buf.size);
cl_assert_equal_s("two rnds", buf.ptr);
git_buf_clear(&buf);
cl_git_pass(git_buf_decode_base85(&buf, "bZBXFAZc?TVqtS-AUHK3Wo~0{WMyOk", 30, 23));
cl_assert_equal_sz(23, buf.size);
cl_assert_equal_s("this is base 85 encoded", buf.ptr);
git_buf_clear(&buf);
git_buf_free(&buf);
}
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 (git_parse_ctx_contains_s(&ctx->parse_ctx, "literal ")) {
type = GIT_DIFF_BINARY_LITERAL;
git_parse_advance_chars(&ctx->parse_ctx, 8);
} else if (git_parse_ctx_contains_s(&ctx->parse_ctx, "delta ")) {
type = GIT_DIFF_BINARY_DELTA;
git_parse_advance_chars(&ctx->parse_ctx, 6);
} else {
error = git_parse_err(
"unknown binary delta type at line %"PRIuZ, ctx->parse_ctx.line_num);
goto done;
}
if (git_parse_advance_digit(&len, &ctx->parse_ctx, 10) < 0 ||
git_parse_advance_nl(&ctx->parse_ctx) < 0 || len < 0) {
error = git_parse_err("invalid binary size at line %"PRIuZ, ctx->parse_ctx.line_num);
goto done;
}
while (ctx->parse_ctx.line_len) {
char c;
size_t encoded_len, decoded_len = 0, decoded_orig = decoded.size;
git_parse_peek(&c, &ctx->parse_ctx, 0);
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 = git_parse_err("invalid binary length at line %"PRIuZ, ctx->parse_ctx.line_num);
goto done;
}
git_parse_advance_chars(&ctx->parse_ctx, 1);
encoded_len = ((decoded_len / 4) + !!(decoded_len % 4)) * 5;
if (encoded_len > ctx->parse_ctx.line_len - 1) {
error = git_parse_err("truncated binary data at line %"PRIuZ, ctx->parse_ctx.line_num);
goto done;
}
if ((error = git_buf_decode_base85(
&decoded, ctx->parse_ctx.line, encoded_len, decoded_len)) < 0)
goto done;
if (decoded.size - decoded_orig != decoded_len) {
error = git_parse_err("truncated binary data at line %"PRIuZ, ctx->parse_ctx.line_num);
goto done;
}
git_parse_advance_chars(&ctx->parse_ctx, encoded_len);
if (git_parse_advance_nl(&ctx->parse_ctx) < 0) {
error = git_parse_err("trailing data at line %"PRIuZ, ctx->parse_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_dispose(&base85);
git_buf_dispose(&decoded);
return error;
}
