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-rw-r--r--zbar/decoder/ean.c735
1 files changed, 735 insertions, 0 deletions
diff --git a/zbar/decoder/ean.c b/zbar/decoder/ean.c
new file mode 100644
index 0000000..024d7f8
--- /dev/null
+++ b/zbar/decoder/ean.c
@@ -0,0 +1,735 @@
+/*------------------------------------------------------------------------
+ * Copyright 2007-2010 (c) Jeff Brown <spadix@users.sourceforge.net>
+ *
+ * This file is part of the ZBar Bar Code Reader.
+ *
+ * The ZBar Bar Code Reader is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU Lesser Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * The ZBar Bar Code Reader is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser Public License
+ * along with the ZBar Bar Code Reader; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301 USA
+ *
+ * http://sourceforge.net/projects/zbar
+ *------------------------------------------------------------------------*/
+
+#include "config.h"
+#include <zbar.h>
+
+#ifdef DEBUG_EAN
+#define DEBUG_LEVEL (DEBUG_EAN)
+#endif
+#include "debug.h"
+#include "decoder.h"
+
+/* partial decode symbol location */
+typedef enum symbol_partial_e
+{
+ EAN_LEFT = 0x0000,
+ EAN_RIGHT = 0x1000,
+} symbol_partial_t;
+
+/* convert compact encoded D2E1E2 to character (bit4 is parity) */
+static const unsigned char digits[] = {
+ /* E1 E2 */
+ 0x06, 0x10, 0x04, 0x13, /* 2 2-5 */
+ 0x19, 0x08, 0x11, 0x05, /* 3 2-5 (d2 <= thr) */
+ 0x09, 0x12, 0x07, 0x15, /* 4 2-5 (d2 <= thr) */
+ 0x16, 0x00, 0x14, 0x03, /* 5 2-5 */
+ 0x18, 0x01, 0x02, 0x17, /* E1E2=43,44,33,34 (d2 > thr) */
+};
+
+static const unsigned char parity_decode[] = {
+ 0xf0, /* [xx] BBBBBB = RIGHT half EAN-13 */
+
+ /* UPC-E check digit encoding */
+ 0xff, 0xff, 0x0f, /* [07] BBBAAA = 0 */
+ 0xff, 0x1f, /* [0b] BBABAA = 1 */
+ 0x2f, /* [0d] BBAABA = 2 */
+ 0xf3, /* [0e] BBAAAB = 3 */
+ 0xff, 0x4f, /* [13] BABBAA = 4 */
+ 0x7f, /* [15] BABABA = 7 */
+ 0xf8, /* [16] BABAAB = 8 */
+ 0x5f, /* [19] BAABBA = 5 */
+ 0xf9, /* [1a] BAABAB = 9 */
+ 0xf6, /* [1c] BAAABB = 6 */
+ 0xff,
+
+ /* LEFT half EAN-13 leading digit */
+ 0xff, 0x6f, /* [23] ABBBAA = 6 */
+ 0x9f, /* [25] ABBABA = 9 */
+ 0xf5, /* [26] ABBAAB = 5 */
+ 0x8f, /* [29] ABABBA = 8 */
+ 0xf7, /* [2a] ABABAB = 7 */
+ 0xf4, /* [2c] ABAABB = 4 */
+ 0xff, 0x3f, /* [31] AABBBA = 3 */
+ 0xf2, /* [32] AABBAB = 2 */
+ 0xf1, /* [34] AABABB = 1 */
+ 0xff, 0xff, 0xff, 0xff, 0x0f, /* [3f] AAAAAA = 0 */
+};
+
+#ifdef DEBUG_EAN
+static unsigned char debug_buf[0x18];
+
+static inline const unsigned char *dsprintbuf(ean_decoder_t *ean)
+{
+ int i;
+ for (i = 0; i < 7; i++)
+ debug_buf[i] =
+ ((ean->buf[0] < 0 || ean->buf[i] < 0) ? '-' : ean->buf[i] + '0');
+ debug_buf[i] = ' ';
+ for (; i < 13; i++)
+ debug_buf[i + 1] =
+ ((ean->buf[7] < 0 || ean->buf[i] < 0) ? '-' : ean->buf[i] + '0');
+ debug_buf[i + 1] = ' ';
+ for (; i < 18; i++)
+ debug_buf[i + 2] =
+ ((ean->buf[13] < 0 || ean->buf[i] < 0) ? '-' : ean->buf[i] + '0');
+ debug_buf[i + 2] = '\0';
+ return (debug_buf);
+}
+#endif
+
+static inline int check_width(unsigned w0, unsigned w1)
+{
+ unsigned dw0 = w0;
+ w0 *= 8;
+ w1 *= 8;
+ return (w0 - dw0 <= w1 && w1 <= w0 + dw0);
+}
+
+/* evaluate previous N (>= 2) widths as auxiliary pattern,
+ * using preceding 4 as character width
+ */
+static inline signed char aux_end(zbar_decoder_t *dcode, unsigned char fwd)
+{
+ signed char code, i;
+
+ /* reference width from previous character */
+ unsigned s = calc_s(dcode, 4 + fwd, 4);
+
+ /* check quiet zone */
+ unsigned qz = get_width(dcode, 0);
+ if (!fwd && qz && qz <= s * 3 / 4) {
+ dbprintf(2, " [invalid quiet]");
+ return (-1);
+ }
+
+ dbprintf(2, " (");
+ code = 0;
+ for (i = 1 - fwd; i < 3 + fwd; i++) {
+ unsigned e = get_width(dcode, i) + get_width(dcode, i + 1);
+ dbprintf(2, " %d", e);
+ code = (code << 2) | decode_e(e, s, 7);
+ if (code < 0) {
+ dbprintf(2, " [invalid end guard]");
+ return (-1);
+ }
+ }
+ dbprintf(2, ") s=%d aux=%x", s, code);
+ return (code);
+}
+
+/* determine possible auxiliary pattern
+ * using current 4 as possible character
+ */
+static inline signed char aux_start(zbar_decoder_t *dcode)
+{
+ /* FIXME NB add-on has no guard in reverse */
+ unsigned e1, e2 = get_width(dcode, 5) + get_width(dcode, 6);
+ unsigned char E1;
+ if (dcode->ean.s4 < 6)
+ return (-1);
+
+ if (decode_e(e2, dcode->ean.s4, 7)) {
+ dbprintf(2, " [invalid any]");
+ return (-1);
+ }
+
+ e1 = get_width(dcode, 4) + get_width(dcode, 5);
+ E1 = decode_e(e1, dcode->ean.s4, 7);
+
+ if (get_color(dcode) == ZBAR_BAR) {
+ /* check for quiet-zone */
+ unsigned qz = get_width(dcode, 7);
+ if (!qz || qz > dcode->ean.s4 * 3 / 4) {
+ if (!E1) {
+ dbprintf(2, " [valid normal]");
+ return (0); /* normal symbol start */
+ } else if (E1 == 1) {
+ dbprintf(2, " [valid add-on]");
+ return (STATE_ADDON); /* add-on symbol start */
+ }
+ }
+ dbprintf(2, " [invalid start]");
+ return (-1);
+ }
+
+ if (!E1) {
+ /* attempting decode from SPACE => validate center guard */
+ unsigned e3 = get_width(dcode, 6) + get_width(dcode, 7);
+ unsigned e4 = get_width(dcode, 7) + get_width(dcode, 8);
+ if (!decode_e(e3, dcode->ean.s4, 7) &&
+ !decode_e(e4, dcode->ean.s4, 7)) {
+ dbprintf(2, " [valid center]");
+ return (0); /* start after center guard */
+ }
+ }
+ dbprintf(2, " [invalid center]");
+ return (-1);
+}
+
+/* check addon delimiter using current 4 as character
+ */
+static inline signed char aux_mid(zbar_decoder_t *dcode)
+{
+ unsigned e = get_width(dcode, 4) + get_width(dcode, 5);
+ return (decode_e(e, dcode->ean.s4, 7));
+}
+
+/* attempt to decode previous 4 widths (2 bars and 2 spaces) as a character */
+static inline signed char decode4(zbar_decoder_t *dcode)
+{
+ signed char code;
+
+ /* calculate similar edge measurements */
+ unsigned e1 = ((get_color(dcode) == ZBAR_BAR) ?
+ get_width(dcode, 0) + get_width(dcode, 1) :
+ get_width(dcode, 2) + get_width(dcode, 3));
+ unsigned e2 = get_width(dcode, 1) + get_width(dcode, 2);
+ dbprintf(2, "\n e1=%d e2=%d", e1, e2);
+
+ if (dcode->ean.s4 < 6)
+ return (-1);
+
+ /* create compacted encoding for direct lookup */
+ code = ((decode_e(e1, dcode->ean.s4, 7) << 2) |
+ decode_e(e2, dcode->ean.s4, 7));
+ if (code < 0)
+ return (-1);
+ dbprintf(2, " code=%x", code);
+
+ /* 4 combinations require additional determinant (D2)
+ E1E2 == 34 (0110)
+ E1E2 == 43 (1001)
+ E1E2 == 33 (0101)
+ E1E2 == 44 (1010)
+ */
+ if ((1 << code) & 0x0660) {
+ unsigned char mid, alt;
+ /* use sum of bar widths */
+ unsigned d2 = ((get_color(dcode) == ZBAR_BAR) ?
+ get_width(dcode, 0) + get_width(dcode, 2) :
+ get_width(dcode, 1) + get_width(dcode, 3));
+ d2 *= 7;
+ mid = (((1 << code) & 0x0420) ? 3 /* E1E2 in 33,44 */
+ :
+ 4); /* E1E2 in 34,43 */
+ alt = d2 > (mid * dcode->ean.s4);
+ if (alt)
+ code = ((code >> 1) & 3) | 0x10; /* compress code space */
+ dbprintf(2, " (d2=%d(%d) alt=%d)", d2, mid * dcode->ean.s4, alt);
+ }
+ dbprintf(2, " char=%02x", digits[(unsigned char)code]);
+ zassert(code < 0x14, -1, "code=%02x e1=%x e2=%x s4=%x color=%x\n", code, e1,
+ e2, dcode->ean.s4, get_color(dcode));
+ return (code);
+}
+
+static inline char ean_part_end2(ean_decoder_t *ean, ean_pass_t *pass)
+{
+ unsigned char par, chk;
+ if (!TEST_CFG(ean->ean2_config, ZBAR_CFG_ENABLE))
+ return (ZBAR_NONE);
+
+ /* extract parity bits */
+ par = ((pass->raw[1] & 0x10) >> 3 | (pass->raw[2] & 0x10) >> 4);
+ /* calculate "checksum" */
+ chk = ~((pass->raw[1] & 0xf) * 10 + (pass->raw[2] & 0xf)) & 0x3;
+ dbprintf(2, " par=%x chk=%x", par, chk);
+ if (par != chk)
+ return (ZBAR_NONE);
+
+ dbprintf(2, "\n");
+ dbprintf(1, "decode2=%x%x\n", pass->raw[1] & 0xf, pass->raw[2] & 0xf);
+ return (ZBAR_EAN2);
+}
+
+static inline zbar_symbol_type_t ean_part_end4(ean_pass_t *pass,
+ unsigned char fwd)
+{
+ /* extract parity bits */
+ unsigned char par =
+ ((pass->raw[1] & 0x10) >> 1 | (pass->raw[2] & 0x10) >> 2 |
+ (pass->raw[3] & 0x10) >> 3 | (pass->raw[4] & 0x10) >> 4);
+
+ dbprintf(2, " par=%x", par);
+ if (par && par != 0xf)
+ /* invalid parity combination */
+ return (ZBAR_NONE);
+
+ if ((!par) == fwd) {
+ /* reverse sampled digits */
+ unsigned char tmp = pass->raw[1];
+ pass->state |= STATE_REV;
+ pass->raw[1] = pass->raw[4];
+ pass->raw[4] = tmp;
+ tmp = pass->raw[2];
+ pass->raw[2] = pass->raw[3];
+ pass->raw[3] = tmp;
+ }
+
+ dbprintf(2, "\n");
+ dbprintf(1, "decode4=%x%x%x%x\n", pass->raw[1] & 0xf, pass->raw[2] & 0xf,
+ pass->raw[3] & 0xf, pass->raw[4] & 0xf);
+ if (!par)
+ return (ZBAR_EAN8 | EAN_RIGHT);
+ return (ZBAR_EAN8 | EAN_LEFT);
+}
+
+static inline char ean_part_end5(ean_decoder_t *ean, ean_pass_t *pass)
+{
+ unsigned char par, chk, parchk;
+ if (!TEST_CFG(ean->ean5_config, ZBAR_CFG_ENABLE))
+ return (ZBAR_NONE);
+
+ /* extract parity bits */
+ par = ((pass->raw[1] & 0x10) | (pass->raw[2] & 0x10) >> 1 |
+ (pass->raw[3] & 0x10) >> 2 | (pass->raw[4] & 0x10) >> 3 |
+ (pass->raw[5] & 0x10) >> 4);
+ /* calculate checksum */
+ chk = (((pass->raw[1] & 0x0f) + (pass->raw[2] & 0x0f) * 3 +
+ (pass->raw[3] & 0x0f) + (pass->raw[4] & 0x0f) * 3 +
+ (pass->raw[5] & 0x0f)) *
+ 3) %
+ 10;
+
+ parchk = parity_decode[par >> 1];
+ if (par & 1)
+ parchk >>= 4;
+ parchk &= 0xf;
+ dbprintf(2, " par=%x(%d) chk=%d", par, parchk, chk);
+ if (parchk != chk)
+ return (ZBAR_NONE);
+
+ dbprintf(2, "\n");
+ dbprintf(1, "decode5=%x%x%x%x%x\n", pass->raw[1] & 0xf, pass->raw[2] & 0xf,
+ pass->raw[3] & 0xf, pass->raw[4] & 0xf, pass->raw[5] & 0xf);
+
+ return (ZBAR_EAN5);
+}
+
+static inline zbar_symbol_type_t
+ean_part_end7(ean_decoder_t *ean, ean_pass_t *pass, unsigned char fwd)
+{
+ /* calculate parity index */
+ unsigned char par =
+ ((fwd) ? ((pass->raw[1] & 0x10) << 1 | (pass->raw[2] & 0x10) |
+ (pass->raw[3] & 0x10) >> 1 | (pass->raw[4] & 0x10) >> 2 |
+ (pass->raw[5] & 0x10) >> 3 | (pass->raw[6] & 0x10) >> 4) :
+ ((pass->raw[1] & 0x10) >> 4 | (pass->raw[2] & 0x10) >> 3 |
+ (pass->raw[3] & 0x10) >> 2 | (pass->raw[4] & 0x10) >> 1 |
+ (pass->raw[5] & 0x10) | (pass->raw[6] & 0x10) << 1));
+
+ /* lookup parity combination */
+ pass->raw[0] = parity_decode[par >> 1];
+ if (par & 1)
+ pass->raw[0] >>= 4;
+ pass->raw[0] &= 0xf;
+ dbprintf(2, " par=%02x(%x)", par, pass->raw[0]);
+
+ if (pass->raw[0] == 0xf)
+ /* invalid parity combination */
+ return (ZBAR_NONE);
+
+ if ((!par) == fwd) {
+ unsigned char i;
+ pass->state |= STATE_REV;
+ /* reverse sampled digits */
+ for (i = 1; i < 4; i++) {
+ unsigned char tmp = pass->raw[i];
+ pass->raw[i] = pass->raw[7 - i];
+ pass->raw[7 - i] = tmp;
+ }
+ }
+
+ dbprintf(2, "\n");
+ dbprintf(1, "decode=%x%x%x%x%x%x%x(%02x)\n", pass->raw[0] & 0xf,
+ pass->raw[1] & 0xf, pass->raw[2] & 0xf, pass->raw[3] & 0xf,
+ pass->raw[4] & 0xf, pass->raw[5] & 0xf, pass->raw[6] & 0xf, par);
+
+ if (TEST_CFG(ean->ean13_config, ZBAR_CFG_ENABLE)) {
+ if (!par)
+ return (ZBAR_EAN13 | EAN_RIGHT);
+ if (par & 0x20)
+ return (ZBAR_EAN13 | EAN_LEFT);
+ }
+ if (par && !(par & 0x20))
+ return (ZBAR_UPCE);
+
+ return (ZBAR_NONE);
+}
+
+/* update state for one of 4 parallel passes */
+static inline zbar_symbol_type_t decode_pass(zbar_decoder_t *dcode,
+ ean_pass_t *pass)
+{
+ unsigned char idx, fwd;
+ pass->state++;
+ idx = pass->state & STATE_IDX;
+ fwd = pass->state & 1;
+
+ if (get_color(dcode) == ZBAR_SPACE) {
+ if (pass->state & STATE_ADDON) {
+ dbprintf(2, " i=%d", idx);
+ if (idx == 0x09 || idx == 0x21) {
+ unsigned qz = get_width(dcode, 0);
+ unsigned s = calc_s(dcode, 1, 4);
+ zbar_symbol_type_t part = !qz || (qz >= s * 3 / 4);
+ if (part && idx == 0x09)
+ part = ean_part_end2(&dcode->ean, pass);
+ else if (part)
+ part = ean_part_end5(&dcode->ean, pass);
+
+ if (part || idx == 0x21) {
+ dcode->ean.direction = 0;
+ pass->state = -1;
+ return (part);
+ }
+ }
+ if ((idx & 7) == 1) {
+ dbprintf(2, " +");
+ pass->state += 2;
+ idx += 2;
+ }
+ } else if ((idx == 0x10 || idx == 0x11) &&
+ TEST_CFG(dcode->ean.ean8_config, ZBAR_CFG_ENABLE) &&
+ !aux_end(dcode, fwd)) {
+ zbar_symbol_type_t part;
+ dbprintf(2, " fwd=%x", fwd);
+ part = ean_part_end4(pass, fwd);
+ if (part)
+ dcode->ean.direction = (pass->state & STATE_REV) != 0;
+ pass->state = -1;
+ return (part);
+ } else if ((idx == 0x18 || idx == 0x19)) {
+ zbar_symbol_type_t part = ZBAR_NONE;
+ dbprintf(2, " fwd=%x", fwd);
+ if (!aux_end(dcode, fwd) && pass->raw[5] != 0xff)
+ part = ean_part_end7(&dcode->ean, pass, fwd);
+ if (part)
+ dcode->ean.direction = (pass->state & STATE_REV) != 0;
+ pass->state = -1;
+ return (part);
+ }
+ }
+
+ if (pass->state & STATE_ADDON)
+ idx >>= 1;
+
+ if (!(idx & 0x03) && idx <= 0x14) {
+ signed char code = -1;
+ unsigned w = pass->width;
+ if (!dcode->ean.s4)
+ return (0);
+ /* validate guard bars before decoding first char of symbol */
+ if (!pass->state) {
+ pass->state = aux_start(dcode);
+ pass->width = dcode->ean.s4;
+ if (pass->state < 0)
+ return (0);
+ idx = pass->state & STATE_IDX;
+ } else {
+ w = check_width(w, dcode->ean.s4);
+ if (w)
+ pass->width = (pass->width + dcode->ean.s4 * 3) / 4;
+ }
+
+ if (w)
+ code = decode4(dcode);
+ else
+ dbprintf(2, " [bad width]");
+
+ if ((code < 0 && idx != 0x10) ||
+ (idx > 0 && (pass->state & STATE_ADDON) && aux_mid(dcode)))
+ pass->state = -1;
+ else if (code < 0)
+ pass->raw[5] = 0xff;
+ else {
+ dbprintf(2, "\n raw[%x]=%02x =>", idx >> 2,
+ digits[(unsigned char)code]);
+ pass->raw[(idx >> 2) + 1] = digits[(unsigned char)code];
+ dbprintf(2, " raw=%d%d%d%d%d%d%d", pass->raw[0] & 0xf,
+ pass->raw[1] & 0xf, pass->raw[2] & 0xf, pass->raw[3] & 0xf,
+ pass->raw[4] & 0xf, pass->raw[5] & 0xf,
+ pass->raw[6] & 0xf);
+ }
+ }
+ return (0);
+}
+
+static inline signed char ean_verify_checksum(ean_decoder_t *ean, int n)
+{
+ unsigned char chk = 0;
+ unsigned char i, d;
+ for (i = 0; i < n; i++) {
+ unsigned char d = ean->buf[i];
+ zassert(d < 10, -1, "i=%x d=%x chk=%x %s\n", i, d, chk,
+ _zbar_decoder_buf_dump((void *)ean->buf, 18));
+ chk += d;
+ if ((i ^ n) & 1) {
+ chk += d << 1;
+ if (chk >= 20)
+ chk -= 20;
+ }
+ if (chk >= 10)
+ chk -= 10;
+ }
+ zassert(chk < 10, -1, "chk=%x n=%x %s", chk, n,
+ _zbar_decoder_buf_dump((void *)ean->buf, 18));
+ if (chk)
+ chk = 10 - chk;
+ d = ean->buf[n];
+ zassert(d < 10, -1, "n=%x d=%x chk=%x %s\n", n, d, chk,
+ _zbar_decoder_buf_dump((void *)ean->buf, 18));
+ if (chk != d) {
+ dbprintf(1, "\nchecksum mismatch %d != %d (%s)\n", chk, d,
+ dsprintbuf(ean));
+ return (-1);
+ }
+ return (0);
+}
+
+static inline unsigned char isbn10_calc_checksum(ean_decoder_t *ean)
+{
+ unsigned int chk = 0;
+ unsigned char w;
+ for (w = 10; w > 1; w--) {
+ unsigned char d = ean->buf[13 - w];
+ zassert(d < 10, '?', "w=%x d=%x chk=%x %s\n", w, d, chk,
+ _zbar_decoder_buf_dump((void *)ean->buf, 18));
+ chk += d * w;
+ }
+ chk = chk % 11;
+ if (!chk)
+ return ('0');
+ chk = 11 - chk;
+ if (chk < 10)
+ return (chk + '0');
+ return ('X');
+}
+
+static inline void ean_expand_upce(ean_decoder_t *ean, ean_pass_t *pass)
+{
+ int i = 0;
+ unsigned char decode;
+ /* parity encoded digit is checksum */
+ ean->buf[12] = pass->raw[i++];
+
+ decode = pass->raw[6] & 0xf;
+ ean->buf[0] = 0;
+ ean->buf[1] = 0;
+ ean->buf[2] = pass->raw[i++] & 0xf;
+ ean->buf[3] = pass->raw[i++] & 0xf;
+ ean->buf[4] = (decode < 3) ? decode : pass->raw[i++] & 0xf;
+ ean->buf[5] = (decode < 4) ? 0 : pass->raw[i++] & 0xf;
+ ean->buf[6] = (decode < 5) ? 0 : pass->raw[i++] & 0xf;
+ ean->buf[7] = 0;
+ ean->buf[8] = 0;
+ ean->buf[9] = (decode < 3) ? pass->raw[i++] & 0xf : 0;
+ ean->buf[10] = (decode < 4) ? pass->raw[i++] & 0xf : 0;
+ ean->buf[11] = (decode < 5) ? pass->raw[i] & 0xf : decode;
+}
+
+static inline zbar_symbol_type_t
+integrate_partial(ean_decoder_t *ean, ean_pass_t *pass, zbar_symbol_type_t part)
+{
+ signed char i, j;
+ /* copy raw data into holding buffer */
+ /* if same partial is not consistent, reset others */
+ dbprintf(2, " integrate part=%x (%s)", part, dsprintbuf(ean));
+
+ if ((ean->left && ((part & ZBAR_SYMBOL) != ean->left)) ||
+ (ean->right && ((part & ZBAR_SYMBOL) != ean->right))) {
+ /* partial mismatch - reset collected parts */
+ dbprintf(2, " rst(type %x %x)", ean->left, ean->right);
+ ean->left = ean->right = ZBAR_NONE;
+ }
+
+ if ((ean->left || ean->right) && !check_width(ean->width, pass->width)) {
+ dbprintf(2, " rst(width %d)", pass->width);
+ ean->left = ean->right = ZBAR_NONE;
+ }
+
+ if (part & EAN_RIGHT) {
+ part &= ZBAR_SYMBOL;
+ j = part - 1;
+ for (i = part >> 1; i; i--, j--) {
+ unsigned char digit = pass->raw[i] & 0xf;
+ if (ean->right && ean->buf[j] != digit) {
+ /* partial mismatch - reset collected parts */
+ dbprintf(2, " rst(right)");
+ ean->left = ean->right = ZBAR_NONE;
+ }
+ ean->buf[j] = digit;
+ }
+ ean->right = part;
+ part &= ean->left; /* FIXME!? */
+ } else if (part == ZBAR_EAN13 || part == ZBAR_EAN8) /* EAN_LEFT */ {
+ j = (part - 1) >> 1;
+ for (i = part >> 1; j >= 0; i--, j--) {
+ unsigned char digit = pass->raw[i] & 0xf;
+ if (ean->left && ean->buf[j] != digit) {
+ /* partial mismatch - reset collected parts */
+ dbprintf(2, " rst(left)");
+ ean->left = ean->right = ZBAR_NONE;
+ }
+ ean->buf[j] = digit;
+ }
+ ean->left = part;
+ part &= ean->right; /* FIXME!? */
+ } else if (part != ZBAR_UPCE) /* add-ons */ {
+ for (i = part; i > 0; i--)
+ ean->buf[i - 1] = pass->raw[i] & 0xf;
+ ean->left = part;
+ } else
+ ean_expand_upce(ean, pass);
+
+ ean->width = pass->width;
+
+ if (!part)
+ part = ZBAR_PARTIAL;
+
+ if (((part == ZBAR_EAN13 || part == ZBAR_UPCE) &&
+ ean_verify_checksum(ean, 12)) ||
+ (part == ZBAR_EAN8 && ean_verify_checksum(ean, 7))) {
+ /* invalid checksum */
+ if (ean->right)
+ ean->left = ZBAR_NONE;
+ else
+ ean->right = ZBAR_NONE;
+ part = ZBAR_NONE;
+ }
+
+ if (part == ZBAR_EAN13) {
+ /* special case EAN-13 subsets */
+ if (!ean->buf[0] && TEST_CFG(ean->upca_config, ZBAR_CFG_ENABLE))
+ part = ZBAR_UPCA;
+ else if (ean->buf[0] == 9 && ean->buf[1] == 7) {
+ if ((ean->buf[2] == 8 || ean->buf[2] == 9) &&
+ TEST_CFG(ean->isbn13_config, ZBAR_CFG_ENABLE)) {
+ part = ZBAR_ISBN13;
+ } else if (ean->buf[2] == 8 &&
+ TEST_CFG(ean->isbn10_config, ZBAR_CFG_ENABLE)) {
+ part = ZBAR_ISBN10;
+ }
+ }
+ } else if (part == ZBAR_UPCE) {
+ if (TEST_CFG(ean->upce_config, ZBAR_CFG_ENABLE)) {
+ /* UPC-E was decompressed for checksum verification,
+ * but user requested compressed result
+ */
+ ean->buf[0] = ean->buf[1] = 0;
+ for (i = 2; i < 8; i++)
+ ean->buf[i] = pass->raw[i - 1] & 0xf;
+ ean->buf[i] = pass->raw[0] & 0xf;
+ } else if (TEST_CFG(ean->upca_config, ZBAR_CFG_ENABLE))
+ /* UPC-E reported as UPC-A has priority over EAN-13 */
+ part = ZBAR_UPCA;
+ else if (TEST_CFG(ean->ean13_config, ZBAR_CFG_ENABLE))
+ part = ZBAR_EAN13;
+ else
+ part = ZBAR_NONE;
+ }
+
+ dbprintf(2, " dir=%d %x/%x=%x", ean->direction, ean->left, ean->right,
+ part);
+ return (part);
+}
+
+/* copy result to output buffer */
+static inline void postprocess(zbar_decoder_t *dcode, zbar_symbol_type_t sym)
+{
+ ean_decoder_t *ean = &dcode->ean;
+ zbar_symbol_type_t base = sym;
+ int i = 0, j = 0;
+ if (base > ZBAR_PARTIAL) {
+ if (base == ZBAR_UPCA)
+ i = 1;
+ else if (base == ZBAR_UPCE) {
+ i = 1;
+ base--;
+ } else if (base == ZBAR_ISBN13)
+ base = ZBAR_EAN13;
+ else if (base == ZBAR_ISBN10)
+ i = 3;
+
+ if (base == ZBAR_ISBN10 ||
+ (base > ZBAR_EAN5 &&
+ !TEST_CFG(ean_get_config(ean, sym), ZBAR_CFG_EMIT_CHECK)))
+ base--;
+
+ for (; j < base && ean->buf[i] >= 0; i++, j++)
+ dcode->buf[j] = ean->buf[i] + '0';
+
+ if (sym == ZBAR_ISBN10 && j == 9 &&
+ TEST_CFG(ean->isbn10_config, ZBAR_CFG_EMIT_CHECK))
+ /* recalculate ISBN-10 check digit */
+ dcode->buf[j++] = isbn10_calc_checksum(ean);
+ }
+ dcode->buflen = j;
+ dcode->buf[j] = '\0';
+ dcode->direction = 1 - 2 * ean->direction;
+ dcode->modifiers = 0;
+ dbprintf(2, " base=%d j=%d (%s)", base, j, dcode->buf);
+}
+
+zbar_symbol_type_t _zbar_decode_ean(zbar_decoder_t *dcode)
+{
+ /* process upto 4 separate passes */
+ zbar_symbol_type_t sym = ZBAR_NONE;
+ unsigned char pass_idx = dcode->idx & 3;
+ unsigned char i;
+
+ /* update latest character width */
+ dcode->ean.s4 -= get_width(dcode, 4);
+ dcode->ean.s4 += get_width(dcode, 0);
+
+ for (i = 0; i < 4; i++) {
+ ean_pass_t *pass = &dcode->ean.pass[i];
+ if (pass->state >= 0 || i == pass_idx) {
+ zbar_symbol_type_t part;
+ dbprintf(2, " ean[%x/%x]: idx=%x st=%d s=%d", i, pass_idx,
+ dcode->idx, pass->state, dcode->ean.s4);
+ part = decode_pass(dcode, pass);
+ if (part) {
+ /* update accumulated data from new partial decode */
+ sym = integrate_partial(&dcode->ean, pass, part);
+ if (sym) {
+ /* this pass valid => _reset_ all passes */
+ dbprintf(2, " sym=%x", sym);
+ dcode->ean.pass[0].state = dcode->ean.pass[1].state = -1;
+ dcode->ean.pass[2].state = dcode->ean.pass[3].state = -1;
+ if (sym > ZBAR_PARTIAL) {
+ if (!acquire_lock(dcode, sym))
+ postprocess(dcode, sym);
+ else {
+ dbprintf(1, " [locked %d]", dcode->lock);
+ sym = ZBAR_PARTIAL;
+ }
+ }
+ }
+ }
+ dbprintf(2, "\n");
+ }
+ }
+ return (sym);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-03 03:36:29 +0000