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Add convenience API funcs ZBarcode_UTF8_To_ECI() and

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`ZBarcode_Dest_Len_ECI()`, primarily for ZXingC++ but also useful
  in general
This commit is contained in:
gitlost
2025-03-02 20:50:55 +00:00
parent 99f94b1027
commit d0465375bb
12 changed files with 647 additions and 167 deletions
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63
backend/library.c
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@@ -979,7 +979,7 @@ static int map_invalid_symbology(struct zint_symbol *symbol) {
return warn_number;
}
/* Encode a barcode. If `length` is 0, `source` must be NUL-terminated */
/* Encode a barcode. If `length` is 0 or negative, `source` must be NUL-terminated */
int ZBarcode_Encode(struct zint_symbol *symbol, const unsigned char *source, int length) {
struct zint_seg segs[1];
@@ -2070,6 +2070,67 @@ float ZBarcode_XdimDp_From_Scale(int symbol_id, float scale, float xdim_mm_or_dp
return xdim_mm_or_dpmm;
}
/* Whether `eci` is valid character set ECI */
static int is_valid_char_set_eci(const int eci) {
/* Allowing ECI 1 and ECI 2 for libzueci compatibility (and ECI 0, which is mapped to ECI 2) */
return (eci <= 35 && eci >= 0 && eci != 14 && eci != 19) || eci == 170 || eci == 899;
}
/* Convert UTF-8 `source` of length `length` to `eci`-encoded `dest`, setting `p_dest_length` to length of `dest`
on output. If `length` is 0 or negative, `source` must be NUL-terminated. Returns 0 on success, else
ZINT_ERROR_INVALID_OPTION or ZINT_ERROR_INVALID_DATA. Compatible with libzueci `zueci_utf8_to_eci()` */
int ZBarcode_UTF8_To_ECI(int eci, const unsigned char *source, int length, unsigned char dest[], int *p_dest_length) {
int error_number;
/* Map ECI 0 to ECI 2 (CP437) for libzueci compatibility */
if (eci == 0) {
eci = 2;
}
if (!is_valid_char_set_eci(eci) || !source || !p_dest_length) {
return ZINT_ERROR_INVALID_OPTION;
}
if (length <= 0) {
length = (int) ustrlen(source); /* Note `zueci_utf8_to_eci()` doesn't do this */
}
if (!is_valid_utf8(source, length)) {
return ZINT_ERROR_INVALID_DATA;
}
if (eci == 26) { /* UTF-8 - no change */
memcpy(dest, source, length);
*p_dest_length = length;
return 0;
}
/* Only set `p_dest_length` on success, for libzueci compatibility */
if ((error_number = utf8_to_eci(eci, source, dest, &length)) == 0) {
*p_dest_length = length;
}
return error_number; /* 0 or ZINT_ERROR_INVALID_DATA */
}
/* Calculate sufficient length needed to convert UTF-8 `source` of length `length` from UTF-8 to `eci`, and place
in `p_dest_length`. If `length` is 0 or negative, `source` must be NUL-terminated. Returns 0 on success, else
ZINT_ERROR_INVALID_OPTION or ZINT_ERROR_INVALID_DATA. Compatible with libzueci `zueci_dest_len_eci()` */
int ZBarcode_Dest_Len_ECI(int eci, const unsigned char *source, int length, int *p_dest_length) {
/* Map ECI 0 to ECI 2 (CP437) for libzueci compatibility */
if (eci == 0) {
eci = 2;
}
if (!is_valid_char_set_eci(eci) || !source || !p_dest_length) {
return ZINT_ERROR_INVALID_OPTION;
}
if (length <= 0) {
length = (int) ustrlen(source); /* Note `zueci_dest_len_eci()` doesn't do this */
}
if (!is_valid_utf8(source, length)) {
return ZINT_ERROR_INVALID_DATA;
}
*p_dest_length = get_eci_length(eci, source, length);
return 0;
}
/* Whether Zint built without PNG support */
int ZBarcode_NoPng(void) {
#ifdef ZINT_NO_PNG