lib/quotedP.c

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#include "common.h"
#include "linefile.h"
#include "dystring.h"
#include "quotedP.h"

char *quotedPrintableEncode(char *input)
/* Use Quoted-Printable standard to encode a string. */
{
struct dyString *dy = dyStringNew(0);
size_t i=0,l=strlen(input);
int width = 0;
for (i=0; i < l; ++i)
    {
    char c = input[i];
    switch (c)
        {
        case '=':
        case '\t':
        case '\r':
        case '\n':
        case ' ':
            dyStringAppendC(dy, '=');
            dyStringPrintf(dy, "%2x", c);
            width += 3;
            break;
        default:
            dyStringAppendC(dy, c);
            ++width;
        }
    if (width > 72)
        {
        dyStringAppendC(dy, '=');
        dyStringAppendC(dy, '\n');
        width = 0;
        }
        
    }
/* add terminator to prevent extra newline */
if (lastChar(dy->string) != '=')  
    dyStringAppendC(dy, '=');
    
return dyStringCannibalize(&dy);
}

boolean quotedPCollapse(char *line)
/* Use Quoted-Printable standard to decode a string.
 * Return true if the line does not end in '='
 * which indicate continuation. */
{
size_t i=0,j=0,l=strlen(line);
boolean result = lastChar(line) != '=';
char c1 = ' ', c2 = ' ';
while(i < l)
    {
    if (line[i] == '=')
        {
        if (i > (l-3)) 
            break;     /* not enough room left for whole char */
        ++i;        
        c1 = line[i++];
        c2 = line[i++];
        toupper(c1);
        toupper(c2);
        if (isdigit(c1))
            c1 -= 48;
        else
            c1 -= 55;
        if (isdigit(c2))
            c2 -= 48;
        else
            c2 -= 55;
        line[j++] = (c1 * 16) + c2;
        }
    else
        {
        line[j++] = line[i++];
        }
    }
line[j] = 0; /* terminate line */
return result;
}

char *quotedPrintableDecode(char *input)
/* Use Quoted-Printable standard to decode a string.  Return decoded
 * string which will be freeMem'd.  */
{
size_t inplen = strlen(input);
char *result = (char *)needMem(inplen+1);
size_t j=0;
char *line = NULL;
int size = 0;
int i = 0;
boolean newLine = FALSE;

struct lineFile *lf = lineFileOnString("", TRUE, cloneString(input));

while (lineFileNext(lf, &line, &size))
    {
    newLine = quotedPCollapse(line);
    size = strlen(line); 
    for (i = 0; i < size; )
        result[j++] = line[i++];
    if (newLine)
        result[j++] = '\n';
    }

lineFileClose(&lf);  /* frees cloned string */

result[j] = 0;  /* terminate text string */
     
return result;
}

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