mirror of git://git.sysmocom.de/ofono
stkutil: convert img to xpm
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parent
3d86fa314a
commit
f9cb5b37dd
147
src/stkutil.c
147
src/stkutil.c
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@ -6076,3 +6076,150 @@ char *stk_text_to_html(const char *utf8,
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/* return characters from string. Caller must free char data */
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return g_string_free(string, FALSE);
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}
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static const char chars_table[] = {
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C',
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'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
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'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c',
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'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p',
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'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '+', '.' };
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char *stk_image_to_xpm(const unsigned char *img, unsigned int len,
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enum stk_img_scheme scheme, const unsigned char *clut,
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unsigned short clut_len)
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{
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guint8 width, height;
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unsigned int ncolors, nbits, entry, cpp;
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unsigned int i, j;
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int bit, k;
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GString *xpm;
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unsigned int pos = 0;
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const char xpm_header[] = "/* XPM */\n";
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const char declaration[] = "static char *xpm[] = {\n";
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char c[3];
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if (img == NULL)
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return NULL;
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/* sanity check length */
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if (len < 3)
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return NULL;
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width = img[pos++];
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height = img[pos++];
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if (scheme == STK_IMG_SCHEME_BASIC) {
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nbits = 1;
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ncolors = 2;
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} else {
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/* sanity check length */
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if ((pos + 4 > len) || (clut == NULL))
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return NULL;
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nbits = img[pos++];
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ncolors = img[pos++];
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/* the value of zero should be interpreted as 256 */
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if (ncolors == 0)
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ncolors = 256;
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/* skip clut offset bytes */
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pos += 2;
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if ((ncolors * 3) > clut_len)
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return NULL;
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}
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if (pos + ((width * height + 7) / 8) > len)
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return NULL;
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/* determine the number of chars need to represent the pixel */
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cpp = ncolors > 64 ? 2 : 1;
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/*
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* space needed:
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* header line
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* declaration and beginning of assignment line
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* values - max length of 19
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* colors - ncolors * (cpp + whitespace + deliminators + color)
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* pixels - width * height * cpp + height deliminators "",\n
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* end of assignment - 2 chars "};"
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*/
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xpm = g_string_sized_new(strlen(xpm_header) + strlen(declaration) +
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19 + ((cpp + 14) * ncolors) +
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(width * height * cpp) + (4 * height) + 2);
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if (xpm == NULL)
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return NULL;
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/* add header, declaration, values */
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g_string_append(xpm, xpm_header);
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g_string_append(xpm, declaration);
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g_string_append_printf(xpm, "\"%d %d %d %d\",\n", width, height,
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ncolors, cpp);
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/* create colors */
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if (scheme == STK_IMG_SCHEME_BASIC) {
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g_string_append(xpm, "\"0\tc #000000\",\n");
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g_string_append(xpm, "\"1\tc #FFFFFF\",\n");
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} else {
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for (i = 0; i < ncolors; i++) {
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/* lookup char representation of this number */
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if (ncolors > 64) {
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c[0] = chars_table[i / 64];
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c[1] = chars_table[i % 64];
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c[2] = '\0';
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} else {
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c[0] = chars_table[i % 64];
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c[1] = '\0';
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}
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if ((i == (ncolors - 1)) &&
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scheme == STK_IMG_SCHEME_TRANSPARENCY)
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g_string_append_printf(xpm,
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"\"%s\tc None\",\n", c);
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else
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g_string_append_printf(xpm,
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"\"%s\tc #%02hhX%02hhX%02hhX\",\n",
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c, clut[0], clut[1], clut[2]);
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clut += 3;
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}
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}
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/* height rows of width pixels */
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k = 7;
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for (i = 0; i < height; i++) {
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g_string_append(xpm, "\"");
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for (j = 0; j < width; j++) {
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entry = 0;
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for (bit = nbits - 1; bit >= 0; bit--) {
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entry |= (img[pos] >> k & 0x1) << bit;
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k--;
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/* see if we crossed a byte boundary */
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if (k < 0) {
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k = 7;
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pos++;
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}
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}
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/* lookup char representation of this number */
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if (ncolors > 64) {
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c[0] = chars_table[entry / 64];
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c[1] = chars_table[entry % 64];
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c[2] = '\0';
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} else {
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c[0] = chars_table[entry % 64];
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c[1] = '\0';
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}
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g_string_append_printf(xpm, "%s", c);
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}
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g_string_append(xpm, "\",\n");
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}
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g_string_append(xpm, "};");
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/* Caller must free char data */
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return g_string_free(xpm, FALSE);
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}
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@ -557,6 +557,12 @@ enum stk_me_status {
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STK_ME_STATUS_NOT_IDLE = 0x01
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};
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enum stk_img_scheme {
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STK_IMG_SCHEME_BASIC = 0x11,
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STK_IMG_SCHEME_COLOR = 0x21,
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STK_IMG_SCHEME_TRANSPARENCY = 0x22,
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};
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/* For data object that only has a byte array with undetermined length */
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struct stk_common_byte_array {
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unsigned char *array;
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@ -1644,3 +1650,6 @@ const unsigned char *stk_pdu_from_envelope(const struct stk_envelope *envelope,
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unsigned int *out_length);
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char *stk_text_to_html(const char *text,
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const unsigned short *attrs, int num_attrs);
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char *stk_image_to_xpm(const unsigned char *img, unsigned int len,
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enum stk_img_scheme scheme, const unsigned char *clut,
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unsigned short clut_len);
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