30 lines
660 B
30 lines
660 B
#include "git-compat-util.h" |
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#include "varint.h" |
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uintmax_t decode_varint(const unsigned char **bufp) |
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{ |
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const unsigned char *buf = *bufp; |
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unsigned char c = *buf++; |
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uintmax_t val = c & 127; |
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while (c & 128) { |
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val += 1; |
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if (!val || MSB(val, 7)) |
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return 0; /* overflow */ |
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c = *buf++; |
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val = (val << 7) + (c & 127); |
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} |
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*bufp = buf; |
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return val; |
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} |
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int encode_varint(uintmax_t value, unsigned char *buf) |
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{ |
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unsigned char varint[16]; |
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unsigned pos = sizeof(varint) - 1; |
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varint[pos] = value & 127; |
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while (value >>= 7) |
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varint[--pos] = 128 | (--value & 127); |
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if (buf) |
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memcpy(buf, varint + pos, sizeof(varint) - pos); |
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return sizeof(varint) - pos; |
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}
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