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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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42
backend/eci.c
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@@ -1,7 +1,7 @@
/* eci.c - Extended Channel Interpretations */
/*
libzint - the open source barcode library
Copyright (C) 2009-2024 Robin Stuart <rstuart114@gmail.com>
Copyright (C) 2009-2025 Robin Stuart <rstuart114@gmail.com>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
@@ -43,6 +43,30 @@
/* Single-byte stuff */
/* ECI 2 (bottom half ASCII, top half CP437), included for libzueci compatibility - assumes valid Unicode */
static int u_cp437(const unsigned int u, unsigned char *dest) {
int s, e;
if (u < 0x80) {
*dest = (unsigned char) u;
return 1;
}
s = 0;
e = ARRAY_SIZE(cp437_u) - 1;
while (s <= e) {
const int m = (s + e) >> 1;
if (cp437_u[m] < u) {
s = m + 1;
} else if (cp437_u[m] > u) {
e = m - 1;
} else {
*dest = cp437_sb[m];
return 1;
}
}
return 0;
}
/* Base ISO/IEC 8859 routine to convert Unicode codepoint `u` */
static int u_iso8859(const unsigned int u, const unsigned short *tab_s, const unsigned short *tab_u,
const unsigned char *tab_sb, int e, unsigned char *dest) {
@@ -181,6 +205,15 @@ static int u_utf32le(const unsigned int u, unsigned char *dest) {
return 4;
}
/* ECI 899 Binary, included for libzueci compatibility - assumes valid Unicode */
static int u_binary(const unsigned int u, unsigned char *dest) {
if (u <= 0xFF) {
*dest = (unsigned char) u;
return 1;
}
return 0;
}
/* Multibyte stuff */
/* Acknowledgements to Bruno Haible <bruno@clisp.org> for a no. of techniques used here */
@@ -701,7 +734,7 @@ typedef int (*eci_func_t)(const unsigned int u, unsigned char *dest);
INTERNAL int utf8_to_eci(const int eci, const unsigned char source[], unsigned char dest[], int *p_length) {
static const eci_func_t eci_funcs[36] = {
NULL, NULL, NULL, NULL, u_iso8859_2, /*0-4*/
NULL, NULL, u_cp437, NULL, u_iso8859_2, /*0-4*/
u_iso8859_3, u_iso8859_4, u_iso8859_5, u_iso8859_6, u_iso8859_7, /*5-9*/
u_iso8859_8, u_iso8859_9, u_iso8859_10, u_iso8859_11, NULL, /*10-14*/
u_iso8859_13, u_iso8859_14, u_iso8859_15, u_iso8859_16, NULL, /*15-19*/
@@ -717,7 +750,8 @@ INTERNAL int utf8_to_eci(const int eci, const unsigned char source[], unsigned c
int length = *p_length;
/* Special case ISO/IEC 8859-1 */
if (eci == 0 || eci == 3) { /* Default ECI 0 to ISO/IEC 8859-1 */
/* Default ECI 0 to ISO/IEC 8859-1 (and ECI 1 for libzueci compatibility) */
if (eci == 0 || eci == 3 || eci == 1) {
while (in_posn < length) {
do {
decode_utf8(&state, &codepoint, source[in_posn++]);
@@ -737,6 +771,8 @@ INTERNAL int utf8_to_eci(const int eci, const unsigned char source[], unsigned c
if (eci == 170) { /* ASCII Invariant (archaic subset) */
eci_func = u_ascii_inv;
} else if (eci == 899) { /* Binary, for libzueci compatibility */
eci_func = u_binary;
} else {
eci_func = eci_funcs[eci];
if (eci_func == NULL) {