78 lines
1.4 KiB
C++
78 lines
1.4 KiB
C++
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#include <stdio.h>
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#include <bfc/platform/types.h>
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#include <strsafe.h>
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static uint8_t quickhex(char c)
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{
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int hexvalue = c;
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if (hexvalue & 0x10)
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hexvalue &= ~0x30;
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else
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{
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hexvalue &= 0xF;
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hexvalue += 9;
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}
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return hexvalue;
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}
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static uint8_t DecodeEscape(const char *&str)
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{
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uint8_t a = quickhex(*++str);
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uint8_t b = quickhex(*++str);
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str++;
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return a * 16 + b;
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}
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static void DecodeEscapedUTF8(char *&output, const char *&input)
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{
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uint8_t utf8_data[1024] = {0}; // hopefully big enough!!
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int num_utf8_words=0;
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bool error=false;
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while (input && *input && *input == '%' && num_utf8_words < sizeof(utf8_data))
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{
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if (isxdigit(input[1]) && isxdigit(input[2]))
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{
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utf8_data[num_utf8_words++]=DecodeEscape(input);
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}
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else if (input[1] == '%')
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{
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input+=2;
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utf8_data[num_utf8_words++]='%';
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}
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else
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{
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error = true;
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break;
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}
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}
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memcpy(output, utf8_data, num_utf8_words);
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output+=num_utf8_words;
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//StringCchCopyExA(output, num_utf8_words, (char *)utf8_data, &output, 0, 0);
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if (error)
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{
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*output++ = *input++;
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}
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}
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// benski> We have the luxury of knowing that decoding will ALWAYS produce smaller strings
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// so we can do it in-place
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void UrlDecode(char *str)
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{
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const char *itr = str;
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while (itr && *itr)
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{
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switch (*itr)
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{
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case '%':
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DecodeEscapedUTF8(str, itr);
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break;
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default:
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*str++ = *itr++;
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break;
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}
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}
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*str = 0;
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}
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