| // After editing this file, run "go generate" in the parent directory. |
| |
| // Copyright 2020 The Wuffs Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| // ---------------- String Conversions |
| |
| // wuffs_base__parse_number__foo_digits entries are 0x00 for invalid digits, |
| // and (0x80 | v) for valid digits, where v is the 4 bit value. |
| |
| static const uint8_t wuffs_base__parse_number__decimal_digits[256] = { |
| // 0 1 2 3 4 5 6 7 |
| // 8 9 A B C D E F |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x00 ..= 0x07. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x08 ..= 0x0F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x10 ..= 0x17. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x18 ..= 0x1F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x20 ..= 0x27. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x28 ..= 0x2F. |
| 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, // 0x30 ..= 0x37. '0'-'7'. |
| 0x88, 0x89, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x38 ..= 0x3F. '8'-'9'. |
| |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x40 ..= 0x47. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x48 ..= 0x4F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x50 ..= 0x57. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x58 ..= 0x5F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x60 ..= 0x67. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x68 ..= 0x6F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x70 ..= 0x77. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x78 ..= 0x7F. |
| |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x80 ..= 0x87. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x88 ..= 0x8F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x90 ..= 0x97. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x98 ..= 0x9F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xA0 ..= 0xA7. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xA8 ..= 0xAF. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xB0 ..= 0xB7. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xB8 ..= 0xBF. |
| |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xC0 ..= 0xC7. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xC8 ..= 0xCF. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xD0 ..= 0xD7. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xD8 ..= 0xDF. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xE0 ..= 0xE7. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xE8 ..= 0xEF. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xF0 ..= 0xF7. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xF8 ..= 0xFF. |
| // 0 1 2 3 4 5 6 7 |
| // 8 9 A B C D E F |
| }; |
| |
| static const uint8_t wuffs_base__parse_number__hexadecimal_digits[256] = { |
| // 0 1 2 3 4 5 6 7 |
| // 8 9 A B C D E F |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x00 ..= 0x07. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x08 ..= 0x0F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x10 ..= 0x17. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x18 ..= 0x1F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x20 ..= 0x27. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x28 ..= 0x2F. |
| 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, // 0x30 ..= 0x37. '0'-'7'. |
| 0x88, 0x89, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x38 ..= 0x3F. '8'-'9'. |
| |
| 0x00, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x00, // 0x40 ..= 0x47. 'A'-'F'. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x48 ..= 0x4F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x50 ..= 0x57. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x58 ..= 0x5F. |
| 0x00, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x00, // 0x60 ..= 0x67. 'a'-'f'. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x68 ..= 0x6F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x70 ..= 0x77. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x78 ..= 0x7F. |
| |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x80 ..= 0x87. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x88 ..= 0x8F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x90 ..= 0x97. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x98 ..= 0x9F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xA0 ..= 0xA7. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xA8 ..= 0xAF. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xB0 ..= 0xB7. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xB8 ..= 0xBF. |
| |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xC0 ..= 0xC7. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xC8 ..= 0xCF. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xD0 ..= 0xD7. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xD8 ..= 0xDF. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xE0 ..= 0xE7. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xE8 ..= 0xEF. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xF0 ..= 0xF7. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0xF8 ..= 0xFF. |
| // 0 1 2 3 4 5 6 7 |
| // 8 9 A B C D E F |
| }; |
| |
| // -------- |
| |
| WUFFS_BASE__MAYBE_STATIC wuffs_base__result_i64 // |
| wuffs_base__parse_number_i64(wuffs_base__slice_u8 s) { |
| uint8_t* p = s.ptr; |
| uint8_t* q = s.ptr + s.len; |
| |
| for (; (p < q) && (*p == '_'); p++) { |
| } |
| |
| bool negative = false; |
| if (p >= q) { |
| goto fail_bad_argument; |
| } else if (*p == '-') { |
| p++; |
| negative = true; |
| } else if (*p == '+') { |
| p++; |
| } |
| |
| do { |
| wuffs_base__result_u64 r = wuffs_base__parse_number_u64( |
| wuffs_base__make_slice_u8(p, (size_t)(q - p))); |
| if (r.status.repr != NULL) { |
| wuffs_base__result_i64 ret; |
| ret.status.repr = r.status.repr; |
| ret.value = 0; |
| return ret; |
| } else if (negative) { |
| if (r.value > 0x8000000000000000) { |
| goto fail_out_of_bounds; |
| } |
| wuffs_base__result_i64 ret; |
| ret.status.repr = NULL; |
| ret.value = -(int64_t)(r.value); |
| return ret; |
| } else if (r.value > 0x7FFFFFFFFFFFFFFF) { |
| goto fail_out_of_bounds; |
| } else { |
| wuffs_base__result_i64 ret; |
| ret.status.repr = NULL; |
| ret.value = +(int64_t)(r.value); |
| return ret; |
| } |
| } while (0); |
| |
| fail_bad_argument: |
| do { |
| wuffs_base__result_i64 ret; |
| ret.status.repr = wuffs_base__error__bad_argument; |
| ret.value = 0; |
| return ret; |
| } while (0); |
| |
| fail_out_of_bounds: |
| do { |
| wuffs_base__result_i64 ret; |
| ret.status.repr = wuffs_base__error__out_of_bounds; |
| ret.value = 0; |
| return ret; |
| } while (0); |
| } |
| |
| WUFFS_BASE__MAYBE_STATIC wuffs_base__result_u64 // |
| wuffs_base__parse_number_u64(wuffs_base__slice_u8 s) { |
| uint8_t* p = s.ptr; |
| uint8_t* q = s.ptr + s.len; |
| |
| for (; (p < q) && (*p == '_'); p++) { |
| } |
| |
| if (p >= q) { |
| goto fail_bad_argument; |
| |
| } else if (*p == '0') { |
| p++; |
| if (p >= q) { |
| goto ok_zero; |
| } |
| if (*p == '_') { |
| p++; |
| for (; p < q; p++) { |
| if (*p != '_') { |
| goto fail_bad_argument; |
| } |
| } |
| goto ok_zero; |
| } |
| |
| if ((*p == 'x') || (*p == 'X')) { |
| p++; |
| for (; (p < q) && (*p == '_'); p++) { |
| } |
| if (p < q) { |
| goto hexadecimal; |
| } |
| |
| } else if ((*p == 'd') || (*p == 'D')) { |
| p++; |
| for (; (p < q) && (*p == '_'); p++) { |
| } |
| if (p < q) { |
| goto decimal; |
| } |
| } |
| |
| goto fail_bad_argument; |
| } |
| |
| decimal: |
| do { |
| uint64_t v = wuffs_base__parse_number__decimal_digits[*p++]; |
| if (v == 0) { |
| goto fail_bad_argument; |
| } |
| v &= 0x0F; |
| |
| // UINT64_MAX is 18446744073709551615, which is ((10 * max10) + max1). |
| const uint64_t max10 = 1844674407370955161u; |
| const uint8_t max1 = 5; |
| |
| for (; p < q; p++) { |
| if (*p == '_') { |
| continue; |
| } |
| uint8_t digit = wuffs_base__parse_number__decimal_digits[*p]; |
| if (digit == 0) { |
| goto fail_bad_argument; |
| } |
| digit &= 0x0F; |
| if ((v > max10) || ((v == max10) && (digit > max1))) { |
| goto fail_out_of_bounds; |
| } |
| v = (10 * v) + ((uint64_t)(digit)); |
| } |
| |
| wuffs_base__result_u64 ret; |
| ret.status.repr = NULL; |
| ret.value = v; |
| return ret; |
| } while (0); |
| |
| hexadecimal: |
| do { |
| uint64_t v = wuffs_base__parse_number__hexadecimal_digits[*p++]; |
| if (v == 0) { |
| goto fail_bad_argument; |
| } |
| v &= 0x0F; |
| |
| for (; p < q; p++) { |
| if (*p == '_') { |
| continue; |
| } |
| uint8_t digit = wuffs_base__parse_number__hexadecimal_digits[*p]; |
| if (digit == 0) { |
| goto fail_bad_argument; |
| } |
| digit &= 0x0F; |
| if ((v >> 60) != 0) { |
| goto fail_out_of_bounds; |
| } |
| v = (v << 4) | ((uint64_t)(digit)); |
| } |
| |
| wuffs_base__result_u64 ret; |
| ret.status.repr = NULL; |
| ret.value = v; |
| return ret; |
| } while (0); |
| |
| ok_zero: |
| do { |
| wuffs_base__result_u64 ret; |
| ret.status.repr = NULL; |
| ret.value = 0; |
| return ret; |
| } while (0); |
| |
| fail_bad_argument: |
| do { |
| wuffs_base__result_u64 ret; |
| ret.status.repr = wuffs_base__error__bad_argument; |
| ret.value = 0; |
| return ret; |
| } while (0); |
| |
| fail_out_of_bounds: |
| do { |
| wuffs_base__result_u64 ret; |
| ret.status.repr = wuffs_base__error__out_of_bounds; |
| ret.value = 0; |
| return ret; |
| } while (0); |
| } |
| |
| // ---------------- Hexadecimal |
| |
| WUFFS_BASE__MAYBE_STATIC size_t // |
| wuffs_base__hexadecimal__decode2(wuffs_base__slice_u8 dst, |
| wuffs_base__slice_u8 src) { |
| size_t src_len2 = src.len / 2; |
| size_t len = dst.len < src_len2 ? dst.len : src_len2; |
| uint8_t* d = dst.ptr; |
| uint8_t* s = src.ptr; |
| size_t n = len; |
| |
| while (n--) { |
| *d = (uint8_t)((wuffs_base__parse_number__hexadecimal_digits[s[0]] << 4) | |
| (wuffs_base__parse_number__hexadecimal_digits[s[1]] & 0x0F)); |
| d += 1; |
| s += 2; |
| } |
| |
| return len; |
| } |
| |
| WUFFS_BASE__MAYBE_STATIC size_t // |
| wuffs_base__hexadecimal__decode4(wuffs_base__slice_u8 dst, |
| wuffs_base__slice_u8 src) { |
| size_t src_len4 = src.len / 4; |
| size_t len = dst.len < src_len4 ? dst.len : src_len4; |
| uint8_t* d = dst.ptr; |
| uint8_t* s = src.ptr; |
| size_t n = len; |
| |
| while (n--) { |
| *d = (uint8_t)((wuffs_base__parse_number__hexadecimal_digits[s[2]] << 4) | |
| (wuffs_base__parse_number__hexadecimal_digits[s[3]] & 0x0F)); |
| d += 1; |
| s += 4; |
| } |
| |
| return len; |
| } |
| |
| // ---------------- Unicode and UTF-8 |
| |
| WUFFS_BASE__MAYBE_STATIC size_t // |
| wuffs_base__utf_8__encode(wuffs_base__slice_u8 dst, uint32_t code_point) { |
| if (code_point <= 0x7F) { |
| if (dst.len >= 1) { |
| dst.ptr[0] = (uint8_t)(code_point); |
| return 1; |
| } |
| |
| } else if (code_point <= 0x07FF) { |
| if (dst.len >= 2) { |
| dst.ptr[0] = (uint8_t)(0xC0 | ((code_point >> 6))); |
| dst.ptr[1] = (uint8_t)(0x80 | ((code_point >> 0) & 0x3F)); |
| return 2; |
| } |
| |
| } else if (code_point <= 0xFFFF) { |
| if ((dst.len >= 3) && ((code_point < 0xD800) || (0xDFFF < code_point))) { |
| dst.ptr[0] = (uint8_t)(0xE0 | ((code_point >> 12))); |
| dst.ptr[1] = (uint8_t)(0x80 | ((code_point >> 6) & 0x3F)); |
| dst.ptr[2] = (uint8_t)(0x80 | ((code_point >> 0) & 0x3F)); |
| return 3; |
| } |
| |
| } else if (code_point <= 0x10FFFF) { |
| if (dst.len >= 4) { |
| dst.ptr[0] = (uint8_t)(0xF0 | ((code_point >> 18))); |
| dst.ptr[1] = (uint8_t)(0x80 | ((code_point >> 12) & 0x3F)); |
| dst.ptr[2] = (uint8_t)(0x80 | ((code_point >> 6) & 0x3F)); |
| dst.ptr[3] = (uint8_t)(0x80 | ((code_point >> 0) & 0x3F)); |
| return 4; |
| } |
| } |
| |
| return 0; |
| } |
| |
| // wuffs_base__utf_8__byte_length_minus_1 is the byte length (minus 1) of a |
| // UTF-8 encoded code point, based on the encoding's initial byte. |
| // - 0x00 is 1-byte UTF-8 (ASCII). |
| // - 0x01 is the start of 2-byte UTF-8. |
| // - 0x02 is the start of 3-byte UTF-8. |
| // - 0x03 is the start of 4-byte UTF-8. |
| // - 0x40 is a UTF-8 tail byte. |
| // - 0x80 is invalid UTF-8. |
| // |
| // RFC 3629 (UTF-8) gives this grammar for valid UTF-8: |
| // UTF8-1 = %x00-7F |
| // UTF8-2 = %xC2-DF UTF8-tail |
| // UTF8-3 = %xE0 %xA0-BF UTF8-tail / %xE1-EC 2( UTF8-tail ) / |
| // %xED %x80-9F UTF8-tail / %xEE-EF 2( UTF8-tail ) |
| // UTF8-4 = %xF0 %x90-BF 2( UTF8-tail ) / %xF1-F3 3( UTF8-tail ) / |
| // %xF4 %x80-8F 2( UTF8-tail ) |
| // UTF8-tail = %x80-BF |
| static const uint8_t wuffs_base__utf_8__byte_length_minus_1[256] = { |
| // 0 1 2 3 4 5 6 7 |
| // 8 9 A B C D E F |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x00 ..= 0x07. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x08 ..= 0x0F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x10 ..= 0x17. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x18 ..= 0x1F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x20 ..= 0x27. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x28 ..= 0x2F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x30 ..= 0x37. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x38 ..= 0x3F. |
| |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x40 ..= 0x47. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x48 ..= 0x4F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x50 ..= 0x57. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x58 ..= 0x5F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x60 ..= 0x67. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x68 ..= 0x6F. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x70 ..= 0x77. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0x78 ..= 0x7F. |
| |
| 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, // 0x80 ..= 0x87. |
| 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, // 0x88 ..= 0x8F. |
| 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, // 0x90 ..= 0x97. |
| 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, // 0x98 ..= 0x9F. |
| 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, // 0xA0 ..= 0xA7. |
| 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, // 0xA8 ..= 0xAF. |
| 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, // 0xB0 ..= 0xB7. |
| 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, // 0xB8 ..= 0xBF. |
| |
| 0x80, 0x80, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, // 0xC0 ..= 0xC7. |
| 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, // 0xC8 ..= 0xCF. |
| 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, // 0xD0 ..= 0xD7. |
| 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, // 0xD8 ..= 0xDF. |
| 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, // 0xE0 ..= 0xE7. |
| 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, // 0xE8 ..= 0xEF. |
| 0x03, 0x03, 0x03, 0x03, 0x03, 0x80, 0x80, 0x80, // 0xF0 ..= 0xF7. |
| 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, // 0xF8 ..= 0xFF. |
| // 0 1 2 3 4 5 6 7 |
| // 8 9 A B C D E F |
| }; |
| |
| WUFFS_BASE__MAYBE_STATIC wuffs_base__utf_8__next__output // |
| wuffs_base__utf_8__next(wuffs_base__slice_u8 s) { |
| if (s.len == 0) { |
| return wuffs_base__make_utf_8__next__output(0, 0); |
| } |
| uint32_t c = s.ptr[0]; |
| switch (wuffs_base__utf_8__byte_length_minus_1[c & 0xFF]) { |
| case 0: |
| return wuffs_base__make_utf_8__next__output(c, 1); |
| |
| case 1: |
| if (s.len < 2) { |
| break; |
| } |
| c = wuffs_base__load_u16le__no_bounds_check(s.ptr); |
| if ((c & 0xC000) != 0x8000) { |
| break; |
| } |
| c = (0x0007C0 & (c << 6)) | (0x00003F & (c >> 8)); |
| return wuffs_base__make_utf_8__next__output(c, 2); |
| |
| case 2: |
| if (s.len < 3) { |
| break; |
| } |
| c = wuffs_base__load_u24le__no_bounds_check(s.ptr); |
| if ((c & 0xC0C000) != 0x808000) { |
| break; |
| } |
| c = (0x00F000 & (c << 12)) | (0x000FC0 & (c >> 2)) | |
| (0x00003F & (c >> 16)); |
| if ((c <= 0x07FF) || ((0xD800 <= c) && (c <= 0xDFFF))) { |
| break; |
| } |
| return wuffs_base__make_utf_8__next__output(c, 3); |
| |
| case 3: |
| if (s.len < 4) { |
| break; |
| } |
| c = wuffs_base__load_u32le__no_bounds_check(s.ptr); |
| if ((c & 0xC0C0C000) != 0x80808000) { |
| break; |
| } |
| c = (0x1C0000 & (c << 18)) | (0x03F000 & (c << 4)) | |
| (0x000FC0 & (c >> 10)) | (0x00003F & (c >> 24)); |
| if ((c <= 0xFFFF) || (0x110000 <= c)) { |
| break; |
| } |
| return wuffs_base__make_utf_8__next__output(c, 4); |
| } |
| |
| return wuffs_base__make_utf_8__next__output( |
| WUFFS_BASE__UNICODE_REPLACEMENT_CHARACTER, 1); |
| } |
| |
| WUFFS_BASE__MAYBE_STATIC size_t // |
| wuffs_base__utf_8__longest_valid_prefix(wuffs_base__slice_u8 s) { |
| // TODO: possibly optimize the all-ASCII case (4 or 8 bytes at a time). |
| // |
| // TODO: possibly optimize this by manually inlining the |
| // wuffs_base__utf_8__next calls. |
| size_t original_len = s.len; |
| while (s.len > 0) { |
| wuffs_base__utf_8__next__output o = wuffs_base__utf_8__next(s); |
| if ((o.code_point > 0x7F) && (o.byte_length == 1)) { |
| break; |
| } |
| s.ptr += o.byte_length; |
| s.len -= o.byte_length; |
| } |
| return original_len - s.len; |
| } |
| |
| WUFFS_BASE__MAYBE_STATIC size_t // |
| wuffs_base__ascii__longest_valid_prefix(wuffs_base__slice_u8 s) { |
| // TODO: possibly optimize this by checking 4 or 8 bytes at a time. |
| uint8_t* original_ptr = s.ptr; |
| uint8_t* p = s.ptr; |
| uint8_t* q = s.ptr + s.len; |
| for (; (p != q) && ((*p & 0x80) == 0); p++) { |
| } |
| return (size_t)(p - original_ptr); |
| } |
