281 lines
9.3 KiB
C++
281 lines
9.3 KiB
C++
#ifndef RAPIDJSON_ITOA_
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#define RAPIDJSON_ITOA_
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namespace rapidjson {
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namespace internal {
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// Modified from https://github.com/miloyip/itoa-benchmark/blob/master/src/branchlut.cpp
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// API is changed to return the character passed the end of string, without writing '\0'
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inline const char* GetDigitsLut() {
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static const char cDigitsLut[200] = {
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'0','0','0','1','0','2','0','3','0','4','0','5','0','6','0','7','0','8','0','9',
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'1','0','1','1','1','2','1','3','1','4','1','5','1','6','1','7','1','8','1','9',
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'2','0','2','1','2','2','2','3','2','4','2','5','2','6','2','7','2','8','2','9',
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'3','0','3','1','3','2','3','3','3','4','3','5','3','6','3','7','3','8','3','9',
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'4','0','4','1','4','2','4','3','4','4','4','5','4','6','4','7','4','8','4','9',
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'5','0','5','1','5','2','5','3','5','4','5','5','5','6','5','7','5','8','5','9',
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'6','0','6','1','6','2','6','3','6','4','6','5','6','6','6','7','6','8','6','9',
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'7','0','7','1','7','2','7','3','7','4','7','5','7','6','7','7','7','8','7','9',
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'8','0','8','1','8','2','8','3','8','4','8','5','8','6','8','7','8','8','8','9',
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'9','0','9','1','9','2','9','3','9','4','9','5','9','6','9','7','9','8','9','9'
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};
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return cDigitsLut;
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}
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inline char* u32toa(uint32_t value, char* buffer) {
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const char* cDigitsLut = GetDigitsLut();
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if (value < 10000) {
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const uint32_t d1 = (value / 100) << 1;
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const uint32_t d2 = (value % 100) << 1;
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if (value >= 1000)
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*buffer++ = cDigitsLut[d1];
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if (value >= 100)
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*buffer++ = cDigitsLut[d1 + 1];
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if (value >= 10)
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*buffer++ = cDigitsLut[d2];
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*buffer++ = cDigitsLut[d2 + 1];
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}
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else if (value < 100000000) {
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// value = bbbbcccc
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const uint32_t b = value / 10000;
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const uint32_t c = value % 10000;
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const uint32_t d1 = (b / 100) << 1;
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const uint32_t d2 = (b % 100) << 1;
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const uint32_t d3 = (c / 100) << 1;
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const uint32_t d4 = (c % 100) << 1;
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if (value >= 10000000)
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*buffer++ = cDigitsLut[d1];
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if (value >= 1000000)
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*buffer++ = cDigitsLut[d1 + 1];
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if (value >= 100000)
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*buffer++ = cDigitsLut[d2];
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*buffer++ = cDigitsLut[d2 + 1];
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*buffer++ = cDigitsLut[d3];
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*buffer++ = cDigitsLut[d3 + 1];
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*buffer++ = cDigitsLut[d4];
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*buffer++ = cDigitsLut[d4 + 1];
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}
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else {
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// value = aabbbbcccc in decimal
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const uint32_t a = value / 100000000; // 1 to 42
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value %= 100000000;
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if (a >= 10) {
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const unsigned i = a << 1;
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*buffer++ = cDigitsLut[i];
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*buffer++ = cDigitsLut[i + 1];
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}
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else
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*buffer++ = '0' + static_cast<char>(a);
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const uint32_t b = value / 10000; // 0 to 9999
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const uint32_t c = value % 10000; // 0 to 9999
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const uint32_t d1 = (b / 100) << 1;
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const uint32_t d2 = (b % 100) << 1;
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const uint32_t d3 = (c / 100) << 1;
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const uint32_t d4 = (c % 100) << 1;
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*buffer++ = cDigitsLut[d1];
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*buffer++ = cDigitsLut[d1 + 1];
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*buffer++ = cDigitsLut[d2];
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*buffer++ = cDigitsLut[d2 + 1];
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*buffer++ = cDigitsLut[d3];
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*buffer++ = cDigitsLut[d3 + 1];
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*buffer++ = cDigitsLut[d4];
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*buffer++ = cDigitsLut[d4 + 1];
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}
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return buffer;
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}
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inline char* i32toa(int32_t value, char* buffer) {
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if (value < 0) {
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*buffer++ = '-';
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value = -value;
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}
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return u32toa(static_cast<uint32_t>(value), buffer);
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}
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inline char* u64toa(uint64_t value, char* buffer) {
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const char* cDigitsLut = GetDigitsLut();
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if (value < UINT64_C(100000000)) {
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uint32_t v = static_cast<uint32_t>(value);
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if (v < 10000) {
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const uint32_t d1 = (v / 100) << 1;
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const uint32_t d2 = (v % 100) << 1;
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if (v >= 1000)
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*buffer++ = cDigitsLut[d1];
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if (v >= 100)
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*buffer++ = cDigitsLut[d1 + 1];
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if (v >= 10)
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*buffer++ = cDigitsLut[d2];
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*buffer++ = cDigitsLut[d2 + 1];
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}
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else {
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// value = bbbbcccc
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const uint32_t b = v / 10000;
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const uint32_t c = v % 10000;
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const uint32_t d1 = (b / 100) << 1;
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const uint32_t d2 = (b % 100) << 1;
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const uint32_t d3 = (c / 100) << 1;
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const uint32_t d4 = (c % 100) << 1;
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if (value >= 10000000)
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*buffer++ = cDigitsLut[d1];
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if (value >= 1000000)
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*buffer++ = cDigitsLut[d1 + 1];
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if (value >= 100000)
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*buffer++ = cDigitsLut[d2];
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*buffer++ = cDigitsLut[d2 + 1];
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*buffer++ = cDigitsLut[d3];
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*buffer++ = cDigitsLut[d3 + 1];
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*buffer++ = cDigitsLut[d4];
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*buffer++ = cDigitsLut[d4 + 1];
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}
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}
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else if (value < UINT64_C(10000000000000000)) {
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const uint32_t v0 = static_cast<uint32_t>(value / UINT64_C(100000000));
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const uint32_t v1 = static_cast<uint32_t>(value % UINT64_C(100000000));
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const uint32_t b0 = v0 / 10000;
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const uint32_t c0 = v0 % 10000;
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const uint32_t d1 = (b0 / 100) << 1;
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const uint32_t d2 = (b0 % 100) << 1;
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const uint32_t d3 = (c0 / 100) << 1;
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const uint32_t d4 = (c0 % 100) << 1;
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const uint32_t b1 = v1 / 10000;
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const uint32_t c1 = v1 % 10000;
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const uint32_t d5 = (b1 / 100) << 1;
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const uint32_t d6 = (b1 % 100) << 1;
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const uint32_t d7 = (c1 / 100) << 1;
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const uint32_t d8 = (c1 % 100) << 1;
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if (value >= UINT64_C(1000000000000000))
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*buffer++ = cDigitsLut[d1];
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if (value >= UINT64_C(100000000000000))
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*buffer++ = cDigitsLut[d1 + 1];
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if (value >= UINT64_C(10000000000000))
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*buffer++ = cDigitsLut[d2];
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if (value >= UINT64_C(1000000000000))
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*buffer++ = cDigitsLut[d2 + 1];
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if (value >= UINT64_C(100000000000))
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*buffer++ = cDigitsLut[d3];
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if (value >= UINT64_C(10000000000))
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*buffer++ = cDigitsLut[d3 + 1];
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if (value >= UINT64_C(1000000000))
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*buffer++ = cDigitsLut[d4];
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if (value >= UINT64_C(100000000))
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*buffer++ = cDigitsLut[d4 + 1];
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*buffer++ = cDigitsLut[d5];
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*buffer++ = cDigitsLut[d5 + 1];
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*buffer++ = cDigitsLut[d6];
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*buffer++ = cDigitsLut[d6 + 1];
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*buffer++ = cDigitsLut[d7];
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*buffer++ = cDigitsLut[d7 + 1];
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*buffer++ = cDigitsLut[d8];
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*buffer++ = cDigitsLut[d8 + 1];
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}
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else {
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const uint32_t a = static_cast<uint32_t>(value / UINT64_C(10000000000000000)); // 1 to 1844
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value %= UINT64_C(10000000000000000);
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if (a < 10)
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*buffer++ = '0' + static_cast<char>(a);
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else if (a < 100) {
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const uint32_t i = a << 1;
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*buffer++ = cDigitsLut[i];
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*buffer++ = cDigitsLut[i + 1];
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}
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else if (a < 1000) {
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*buffer++ = '0' + static_cast<char>(a / 100);
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const uint32_t i = (a % 100) << 1;
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*buffer++ = cDigitsLut[i];
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*buffer++ = cDigitsLut[i + 1];
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}
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else {
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const uint32_t i = (a / 100) << 1;
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const uint32_t j = (a % 100) << 1;
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*buffer++ = cDigitsLut[i];
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*buffer++ = cDigitsLut[i + 1];
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*buffer++ = cDigitsLut[j];
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*buffer++ = cDigitsLut[j + 1];
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}
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const uint32_t v0 = static_cast<uint32_t>(value / UINT64_C(100000000));
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const uint32_t v1 = static_cast<uint32_t>(value % UINT64_C(100000000));
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const uint32_t b0 = v0 / 10000;
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const uint32_t c0 = v0 % 10000;
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const uint32_t d1 = (b0 / 100) << 1;
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const uint32_t d2 = (b0 % 100) << 1;
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const uint32_t d3 = (c0 / 100) << 1;
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const uint32_t d4 = (c0 % 100) << 1;
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const uint32_t b1 = v1 / 10000;
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const uint32_t c1 = v1 % 10000;
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const uint32_t d5 = (b1 / 100) << 1;
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const uint32_t d6 = (b1 % 100) << 1;
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const uint32_t d7 = (c1 / 100) << 1;
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const uint32_t d8 = (c1 % 100) << 1;
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*buffer++ = cDigitsLut[d1];
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*buffer++ = cDigitsLut[d1 + 1];
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*buffer++ = cDigitsLut[d2];
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*buffer++ = cDigitsLut[d2 + 1];
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*buffer++ = cDigitsLut[d3];
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*buffer++ = cDigitsLut[d3 + 1];
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*buffer++ = cDigitsLut[d4];
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*buffer++ = cDigitsLut[d4 + 1];
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*buffer++ = cDigitsLut[d5];
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*buffer++ = cDigitsLut[d5 + 1];
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*buffer++ = cDigitsLut[d6];
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*buffer++ = cDigitsLut[d6 + 1];
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*buffer++ = cDigitsLut[d7];
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*buffer++ = cDigitsLut[d7 + 1];
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*buffer++ = cDigitsLut[d8];
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*buffer++ = cDigitsLut[d8 + 1];
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}
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return buffer;
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}
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inline char* i64toa(int64_t value, char* buffer) {
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if (value < 0) {
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*buffer++ = '-';
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value = -value;
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}
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return u64toa(static_cast<uint64_t>(value), buffer);
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}
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} // namespace internal
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} // namespace rapidjson
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#endif // RAPIDJSON_ITOA_
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