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39 lines
1.1 KiB
39 lines
1.1 KiB
#include "scan.h" |
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size_t scan_varint(const char* in,size_t len, unsigned long long* n) { |
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size_t i; |
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unsigned long long l; |
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if (len==0) return 0; |
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for (l=0, i=0; i<len; ++i) { |
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if (i*7+7>sizeof(l)*8) // value too large to fit in destination integer! |
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return 0; |
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l+=(unsigned long long)(in[i]&0x7f) << (i*7); |
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if (!(in[i]&0x80)) { |
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if (in[i]==0) return 0; // libowfat extension: reject non-minimal encoding |
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*n=l; |
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return i+1; |
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} |
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} |
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return 0; |
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} |
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#ifdef __ELF__ |
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size_t scan_pb_type0_int(const char* dest,size_t len,unsigned long long* l) __attribute__((alias("scan_varint"))); |
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#else |
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size_t scan_pb_type0_int(const char* dest,size_t len,unsigned long long* l) { |
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return scan_varint(dest,len,l); |
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} |
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#endif |
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#ifdef UNITTEST |
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#include <assert.h> |
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int main() { |
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unsigned long long n; |
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assert(scan_varint("\x05",1,&n)==1 && n==5); |
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assert(scan_varint("\x80\x00",2,&n)==0); // non-minimal encoding |
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assert(scan_varint("\x80\x80",2,&n)==0); // truncated (last byte in sequence has high bit 0) |
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assert(scan_varint("\x80\x80\x80\x80\x80\x80\x80\x80\x80\x01",10,&n)==0); // value too large |
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return 0; |
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} |
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#endif
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