zint/backend/tests/test_png.c

/*
    libzint - the open source barcode library
    Copyright (C) 2020 - 2021 Robin Stuart <rstuart114@gmail.com>

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.
    3. Neither the name of the project nor the names of its contributors
       may be used to endorse or promote products derived from this software
       without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
    ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
    FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.
 */
/* vim: set ts=4 sw=4 et : */

#include "testcommon.h"
#include <errno.h>
#include <sys/stat.h>

INTERNAL int png_pixel_plot(struct zint_symbol *symbol, unsigned char *pixelbuf);

static void test_pixel_plot(int index, int debug) {

    struct item {
        int width;
        int height;
        char *pattern;
        int repeat;
        int ret;
    };
    // s/\/\*[ 0-9]*\*\//\=printf("\/*%3d*\/", line(".") - line("'<"))
    struct item data[] = {
        /*  0*/ { 1, 1, "1", 0, 0 },
        /*  1*/ { 2, 1, "11", 0, 0 },
        /*  2*/ { 2, 2, "10", 1, 0 },
        /*  3*/ { 3, 1, "101", 0, 0 },
        /*  4*/ { 3, 2, "101010", 0, 0 },
        /*  5*/ { 3, 3, "101010101", 0, 0 },
        /*  6*/ { 8, 2, "CBMWKRYGGYRKWMBC", 0, 0 },
    };
    int data_size = ARRAY_SIZE(data);
    int i, ret;
    struct zint_symbol *symbol;

    char *png = "out.png";

    char data_buf[8 * 2 + 1];

    int have_identify = testUtilHaveIdentify();

    testStart("test_pixel_plot");

    for (i = 0; i < data_size; i++) {
        int size;

        if (index != -1 && i != index) continue;

        symbol = ZBarcode_Create();
        assert_nonnull(symbol, "Symbol not created\n");

        strcpy(symbol->outfile, png);

        symbol->bitmap_width = data[i].width;
        symbol->bitmap_height = data[i].height;
        symbol->debug |= debug;

        size = data[i].width * data[i].height;
        assert_nonzero(size < (int) sizeof(data_buf), "i:%d png_pixel_plot size %d < sizeof(data_buf) %d\n", i, size, (int) sizeof(data_buf));

        if (data[i].repeat) {
            testUtilStrCpyRepeat(data_buf, data[i].pattern, size);
        } else {
            strcpy(data_buf, data[i].pattern);
        }
        assert_equal(size, (int) strlen(data_buf), "i:%d png_pixel_plot size %d != strlen(data_buf) %d\n", i, size, (int) strlen(data_buf));

        symbol->bitmap = (unsigned char *) data_buf;

        ret = png_pixel_plot(symbol, (unsigned char *) data_buf);
        assert_equal(ret, data[i].ret, "i:%d png_pixel_plot ret %d != %d (%s)\n", i, ret, data[i].ret, symbol->errtxt);

        if (ret < ZINT_ERROR) {
            if (have_identify) {
                ret = testUtilVerifyIdentify(symbol->outfile, debug);
                assert_zero(ret, "i:%d identify %s ret %d != 0\n", i, symbol->outfile, ret);
            }
            if (!(debug & ZINT_DEBUG_TEST_KEEP_OUTFILE)) {
                assert_zero(remove(symbol->outfile), "i:%d remove(%s) != 0\n", i, symbol->outfile);
            }
        } else {
            if (!(debug & ZINT_DEBUG_TEST_KEEP_OUTFILE)) {
                (void) remove(symbol->outfile);
            }
        }

        symbol->bitmap = NULL;

        ZBarcode_Delete(symbol);
    }

    testFinish();
}

static void test_print(int index, int generate, int debug) {

    struct item {
        int symbology;
        int input_mode;
        int border_width;
        int output_options;
        int whitespace_width;
        int whitespace_height;
        int show_hrt;
        int option_1;
        int option_2;
        float height;
        float scale;
        char *fgcolour;
        char *bgcolour;
        char *data;
        char *composite;
        int ret;
        char *expected_file;
        char *comment;
    };
    struct item data[] = {
        /*  0*/ { BARCODE_CODE128, UNICODE_MODE, -1, BOLD_TEXT, -1, -1, -1, -1, -1, 0, 0, "", "", "Égjpqy", "", 0, "code128_egrave_bold.png", "" },
        /*  1*/ { BARCODE_CODE128, UNICODE_MODE, 3, BOLD_TEXT | BARCODE_BOX, -1, -1, -1, -1, -1, 0, 0, "", "", "Égjpqy", "", 0, "code128_egrave_bold_box3.png", "" },
        /*  2*/ { BARCODE_CODE128, UNICODE_MODE, 2, BOLD_TEXT | BARCODE_BOX, 2, 2, -1, -1, -1, 0, 0, "", "", "Égjpqy", "", 0, "code128_egrave_bold_hvwsp2_box2.png", "" },
        /*  3*/ { BARCODE_GS1_128_CC, -1, -1, -1, -1, -1, -1, 3, -1, 0, 0, "", "", "[00]030123456789012340", "[02]13012345678909[37]24[10]1234567ABCDEFG", 0, "gs1_128_cc_fig12.png", "" },
        /*  4*/ { BARCODE_CODABLOCKF, -1, 3, -1, -1, -1, -1, 3, -1, 0, 0, "", "", "AAAAAAAAA", "", 0, "codablockf_3rows.png", "" },
        /*  5*/ { BARCODE_CODABLOCKF, -1, -1, -1, 2, 2, -1, -1, -1, 0, 0, "", "", "AAAAAAAAA", "", 0, "codablockf_hvwsp2.png", "" },
        /*  6*/ { BARCODE_CODABLOCKF, -1, 2, BARCODE_BOX, 2, 2, -1, -1, -1, 0, 0, "", "", "AAAAAAAAA", "", 0, "codablockf_hvwsp2_box2.png", "" },
        /*  7*/ { BARCODE_EANX, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, "", "", "9771384524017+12", "", 0, "ean13_2addon_ggs_5.2.2.5.1-2.png", "" },
        /*  8*/ { BARCODE_EANX, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, "", "", "9780877799306+54321", "", 0, "ean13_5addon_ggs_5.2.2.5.2-2.png", "" },
        /*  9*/ { BARCODE_EANX_CC, -1, -1, -1, -1, -1, -1, 1, -1, 0, 0, "", "", "123456789012+12", "[91]123456789012345678901", 0, "ean13_cc_2addon_cca_4x4.png", "" },
        /* 10*/ { BARCODE_EANX_CC, -1, -1, -1, -1, -1, -1, 2, -1, 0, 0, "", "", "123456789012+54321", "[91]1234567890", 0, "ean13_cc_5addon_ccb_3x4.png", "" },
        /* 11*/ { BARCODE_EANX_CC, -1, -1, -1, -1, -1, 0, 2, -1, 0, 0, "", "", "123456789012+54321", "[91]1234567890", 0, "ean13_cc_5addon_ccb_3x4_notext.png", "" },
        /* 12*/ { BARCODE_UPCA, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, "", "", "012345678905+24", "", 0, "upca_2addon_ggs_5.2.6.6-5.png", "" },
        /* 13*/ { BARCODE_UPCA, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, "", "", "614141234417+12345", "", 0, "upca_5addon.png", "" },
        /* 14*/ { BARCODE_UPCA, -1, -1, -1, -1, -1, 0, -1, -1, 0, 0, "", "", "614141234417+12345", "", 0, "upca_5addon_notext.png", "" },
        /* 15*/ { BARCODE_UPCA, -1, 3, BARCODE_BIND, -1, -1, -1, -1, -1, 0, 0, "", "", "614141234417+12345", "", 0, "upca_5addon_bind3.png", "" },
        /* 16*/ { BARCODE_UPCA_CC, -1, -1, -1, -1, -1, -1, 1, -1, 0, 0, "", "", "12345678901+12", "[91]123456789", 0, "upca_cc_2addon_cca_3x4.png", "" },
        /* 17*/ { BARCODE_UPCA_CC, -1, -1, -1, -1, -1, -1, 2, -1, 0, 0, "", "", "12345678901+12121", "[91]1234567890123", 0, "upca_cc_5addon_ccb_4x4.png", "" },
        /* 18*/ { BARCODE_UPCA_CC, -1, -1, -1, -1, -1, 0, 2, -1, 0, 0, "", "", "12345678901+12121", "[91]1234567890123", 0, "upca_cc_5addon_ccb_4x4_notext.png", "" },
        /* 19*/ { BARCODE_UPCA_CC, -1, 3, BARCODE_BIND, -1, -1, -1, 2, -1, 0, 0, "", "", "12345678901+12121", "[91]1234567890123", 0, "upca_cc_5addon_ccb_4x4_bind3.png", "" },
        /* 20*/ { BARCODE_UPCE, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, "", "", "1234567+12", "", 0, "upce_2addon.png", "" },
        /* 21*/ { BARCODE_UPCE, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, "", "", "1234567+12345", "", 0, "upce_5addon.png", "" },
        /* 22*/ { BARCODE_UPCE, -1, -1, SMALL_TEXT, -1, -1, -1, -1, -1, 0, 0, "", "", "1234567+12345", "", 0, "upce_5addon_small.png", "" },
        /* 23*/ { BARCODE_UPCE_CC, -1, -1, -1, -1, -1, -1, 1, -1, 0, 0, "", "", "0654321+89", "[91]1", 0, "upce_cc_2addon_cca_5x2.png", "" },
        /* 24*/ { BARCODE_UPCE_CC, -1, -1, -1, -1, -1, -1, 2, -1, 0, 0, "", "", "1876543+56789", "[91]12345", 0, "upce_cc_5addon_ccb_8x2.png", "" },
        /* 25*/ { BARCODE_UPCE_CC, -1, -1, -1, -1, -1, 0, 2, -1, 0, 0, "", "", "1876543+56789", "[91]12345", 0, "upce_cc_5addon_ccb_8x2_notext.png", "" },
        /* 26*/ { BARCODE_EANX, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, "", "", "1234567+12", "", 0, "ean8_2addon.png", "" },
        /* 27*/ { BARCODE_EANX, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, "", "", "1234567+12345", "", 0, "ean8_5addon.png", "" },
        /* 28*/ { BARCODE_EANX_CC, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, "", "", "9876543+65", "[91]1234567", 0, "ean8_cc_2addon_cca_4x3.png", "" },
        /* 29*/ { BARCODE_EANX_CC, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, "", "", "9876543+74083", "[91]123456789012345678", 0, "ean8_cc_5addon_ccb_8x3.png", "" },
        /* 30*/ { BARCODE_EANX, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, "", "", "12345", "", 0, "ean5.png", "" },
        /* 31*/ { BARCODE_EANX, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, "", "", "12", "", 0, "ean2.png", "" },
        /* 32*/ { BARCODE_CODE39, -1, -1, SMALL_TEXT, -1, -1, -1, -1, -1, 0, 0, "", "", "123", "", 0, "code39_small.png", "" },
        /* 33*/ { BARCODE_POSTNET, -1, -1, -1, -1, -1, -1, -1, -1, 0, 3.5, "", "", "12345", "", 0, "postnet_zip.png", "300 dpi, using 1/43in X, 300 / 43 / 2 = ~3.5 scale" },
        /* 34*/ { BARCODE_PDF417, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, "", "CFCECDCC", "12345", "", 0, "pdf417_bgalpha.png", "" },
        /* 35*/ { BARCODE_PDF417, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, "30313233", "", "12345", "", 0, "pdf417_fgalpha.png", "" },
        /* 36*/ { BARCODE_PDF417, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, "20212244", "CFCECDCC", "12345", "", 0, "pdf417_bgfgalpha.png", "" },
        /* 37*/ { BARCODE_ULTRA, -1, -1, -1, 2, -1, -1, -1, -1, 0, 0, "0000007F", "FF000033", "12345", "", 0, "ultra_bgfgalpha.png", "" },
        /* 38*/ { BARCODE_ULTRA, -1, -1, -1, 2, -1, -1, -1, -1, 0, 0, "", "FF000033", "12345", "", 0, "ultra_bgalpha.png", "" },
        /* 39*/ { BARCODE_ULTRA, -1, -1, -1, 2, -1, -1, -1, -1, 0, 0, "0000007F", "FF0000", "12345", "", 0, "ultra_fgalpha.png", "" },
        /* 40*/ { BARCODE_ULTRA, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, "0000007F", "", "12345", "", 0, "ultra_fgalpha_nobg.png", "" },
        /* 41*/ { BARCODE_ULTRA, -1, 1, BARCODE_BOX, 1, 1, -1, -1, -1, 0, 0, "", "", "12345", "", 0, "ultra_hvwsp1_box1.png", "" },
        /* 42*/ { BARCODE_ULTRA, -1, 1, BARCODE_BOX, 1, 1, -1, -1, -1, 0, 0, "00FF007F", "BABDB6", "12345", "", 0, "ultra_fgalpha_hvwsp1_box1.png", "" },
        /* 43*/ { BARCODE_ULTRA, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0.5, "", "", "1", "", 0, "ultra_odd.png", "" },
        /* 44*/ { BARCODE_MAXICODE, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0.5, "", "", "ABCDEFGHIJKLMNOPQRSTUVWXYZ", "", 0, "maxicode_0.5.png", "6 dpmm, 150 dpi" },
        /* 45*/ { BARCODE_MAXICODE, -1, 1, BARCODE_BOX, 3, -1, -1, -1, -1, 0, 0.7, "", "", "ABCDEFGHIJKLMNOPQRSTUVWXYZ", "", 0, "maxicode_0.7_wsp3_box1.png", "8 dpmm, 200 dpi" },
        /* 46*/ { BARCODE_MAXICODE, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1.4, "1111117F", "EEEEEEEE", "ABCDEFGHIJKLMNOPQRSTUVWXYZ", "", 0, "maxicode_1.4_bgfgalpha.png", "16 dpmm, 400 dpi" },
        /* 47*/ { BARCODE_MAXICODE, -1, -1, -1, -1, -1, -1, -1, -1, 0, 2.1, "", "", "ABCDEFGHIJKLMNOPQRSTUVWXYZ", "", 0, "maxicode_2.1.png", "24 dpmm, 600 dpi" },
        /* 48*/ { BARCODE_MAXICODE, -1, 2, BARCODE_BOX, 1, 1, -1, -1, -1, 0, 0, "", "", "ABCDEFGHIJKLMNOPQRSTUVWXYZ", "", 0, "maxicode_hvwsp1_box2.png", "" },
        /* 49*/ { BARCODE_MAXICODE, -1, 1, BARCODE_BIND, -1, 1, -1, -1, -1, 0, 0, "", "", "ABCDEFGHIJKLMNOPQRSTUVWXYZ", "", 0, "maxicode_vwsp1_bind1.png", "" },
        /* 50*/ { BARCODE_DATAMATRIX, -1, 1, BARCODE_BIND | BARCODE_DOTTY_MODE, -1, -1, -1, -1, -1, 0, 2.0f, "", "", "1234", "", 0, "datamatrix_2.0_bind1_dotty.png", "" },
        /* 51*/ { BARCODE_DATAMATRIX, -1, 1, BARCODE_BIND | BARCODE_DOTTY_MODE, 1, 1, -1, -1, -1, 0, 2.0f, "", "", "1234", "", 0, "datamatrix_2.0_hvwsp1_bind1_dotty.png", "" },
        /* 52*/ { BARCODE_DBAR_LTD, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, "", "", "12345678909", "", 0, "dbar_ltd.png", "" },
        /* 53*/ { BARCODE_PDF417, -1, -1, -1, -1, -1, -1, -1, -1, 5.0, 0, "", "", "Your Data Here!", "", ZINT_WARN_NONCOMPLIANT, "pdf417_height5.png", "" },
        /* 54*/ { BARCODE_USPS_IMAIL, -1, -1, -1, -1, -1, -1, -1, -1, 7.75, 0, "", "", "12345678901234567890", "", 0, "imail_height7.75.png", "" },
        /* 55*/ { BARCODE_AZTEC, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, "", "", "1234567890", "", 0, "aztec.png", "" },
    };
    int data_size = ARRAY_SIZE(data);
    int i, length, ret;
    struct zint_symbol *symbol;

    const char *data_dir = "/backend/tests/data/png";
    const char *png = "out.png";
    char expected_file[1024];
    char escaped[1024];
    int escaped_size = 1024;
    char *text;

    int have_identify = testUtilHaveIdentify();

    testStart("test_print");

    if (generate) {
        char data_dir_path[1024];
        assert_nonzero(testUtilDataPath(data_dir_path, sizeof(data_dir_path), data_dir, NULL), "testUtilDataPath(%s) == 0\n", data_dir);
        if (!testUtilDirExists(data_dir_path)) {
            ret = testUtilMkDir(data_dir_path);
            assert_zero(ret, "testUtilMkDir(%s) ret %d != 0 (%d: %s)\n", data_dir_path, ret, errno, strerror(errno));
        }
    }

    for (i = 0; i < data_size; i++) {
        int text_length;

        if (index != -1 && i != index) continue;

        symbol = ZBarcode_Create();
        assert_nonnull(symbol, "Symbol not created\n");

        length = testUtilSetSymbol(symbol, data[i].symbology, data[i].input_mode, -1 /*eci*/, data[i].option_1, data[i].option_2, -1, data[i].output_options, data[i].data, -1, debug);
        if (data[i].show_hrt != -1) {
            symbol->show_hrt = data[i].show_hrt;
        }
        if (data[i].height) {
            symbol->height = data[i].height;
        }
        if (data[i].scale) {
            symbol->scale = data[i].scale;
        }
        if (data[i].border_width != -1) {
            symbol->border_width = data[i].border_width;
        }
        if (data[i].whitespace_width != -1) {
            symbol->whitespace_width = data[i].whitespace_width;
        }
        if (data[i].whitespace_height != -1) {
            symbol->whitespace_height = data[i].whitespace_height;
        }
        if (*data[i].fgcolour) {
            strcpy(symbol->fgcolour, data[i].fgcolour);
        }
        if (*data[i].bgcolour) {
            strcpy(symbol->bgcolour, data[i].bgcolour);
        }
        if (strlen(data[i].composite)) {
            text = data[i].composite;
            strcpy(symbol->primary, data[i].data);
        } else {
            text = data[i].data;
        }
        text_length = (int) strlen(text);

        ret = ZBarcode_Encode(symbol, (unsigned char *) text, text_length);
        assert_equal(ret, data[i].ret, "i:%d %s ZBarcode_Encode ret %d != %d (%s)\n", i, testUtilBarcodeName(data[i].symbology), ret, data[i].ret, symbol->errtxt);

        strcpy(symbol->outfile, png);
        ret = ZBarcode_Print(symbol, 0);
        assert_zero(ret, "i:%d %s ZBarcode_Print %s ret %d != 0 (%s)\n", i, testUtilBarcodeName(data[i].symbology), symbol->outfile, ret, symbol->errtxt);

        assert_nonzero(testUtilDataPath(expected_file, sizeof(expected_file), data_dir, data[i].expected_file), "i:%d testUtilDataPath == 0\n", i);

        if (generate) {
            printf("        /*%3d*/ { %s, %s, %d, %s, %d, %d, %d, %d, %d, %.5g, %.5g, \"%s\", \"%s\", \"%s\", \"%s\", %d, \"%s\", \"%s\" },\n",
                    i, testUtilBarcodeName(data[i].symbology), testUtilInputModeName(data[i].input_mode), data[i].border_width, testUtilOutputOptionsName(data[i].output_options),
                    data[i].whitespace_width, data[i].whitespace_height, data[i].show_hrt, data[i].option_1, data[i].option_2, data[i].height, data[i].scale, data[i].fgcolour, data[i].bgcolour,
                    testUtilEscape(data[i].data, length, escaped, escaped_size), data[i].composite, data[i].ret, data[i].expected_file, data[i].comment);
            ret = testUtilRename(symbol->outfile, expected_file);
            assert_zero(ret, "i:%d testUtilRename(%s, %s) ret %d != 0\n", i, symbol->outfile, expected_file, ret);
            if (have_identify) {
                ret = testUtilVerifyIdentify(expected_file, debug);
                assert_zero(ret, "i:%d %s identify %s ret %d != 0\n", i, testUtilBarcodeName(data[i].symbology), expected_file, ret);
            }
        } else {
            assert_nonzero(testUtilExists(symbol->outfile), "i:%d testUtilExists(%s) == 0\n", i, symbol->outfile);
            assert_nonzero(testUtilExists(expected_file), "i:%d testUtilExists(%s) == 0\n", i, expected_file);

            ret = testUtilCmpPngs(symbol->outfile, expected_file);
            assert_zero(ret, "i:%d %s testUtilCmpPngs(%s, %s) %d != 0\n", i, testUtilBarcodeName(data[i].symbology), symbol->outfile, expected_file, ret);
            ret = testUtilCmpBins(symbol->outfile, expected_file);
            assert_zero(ret, "i:%d %s testUtilCmpBins(%s, %s) %d != 0\n", i, testUtilBarcodeName(data[i].symbology), symbol->outfile, expected_file, ret);
            assert_zero(remove(symbol->outfile), "i:%d remove(%s) != 0\n", i, symbol->outfile);
        }

        ZBarcode_Delete(symbol);
    }

    testFinish();
}

static void test_outfile(void) {
    int ret;
    struct zint_symbol symbol = {0};
    unsigned char data[] = { "1" };

    testStart("test_outfile");

    symbol.symbology = BARCODE_CODE128;
    symbol.bitmap = data;
    symbol.bitmap_width = symbol.bitmap_height = 1;

    strcpy(symbol.outfile, "nosuch_dir/out.png");

    ret = png_pixel_plot(&symbol, data);
    assert_equal(ret, ZINT_ERROR_FILE_ACCESS, "png_pixel_plot ret %d != ZINT_ERROR_FILE_ACCESS (%d) (%s)\n", ret, ZINT_ERROR_FILE_ACCESS, symbol.errtxt);

    symbol.output_options |= BARCODE_STDOUT;

    ret = png_pixel_plot(&symbol, data);
    printf(" - ignore (PNG to stdout)\n"); fflush(stdout);
    assert_zero(ret, "png_pixel_plot ret %d != 0 (%s)\n", ret, symbol.errtxt);

    testFinish();
}

#include <png.h>
#include <setjmp.h>

struct wpng_error_type {
    struct zint_symbol *symbol;
    jmp_buf jmpbuf;
};

STATIC_UNLESS_ZINT_TEST void wpng_error_handler(png_structp png_ptr, png_const_charp msg);

static void test_wpng_error_handler(void) {
    int ret;
    char filename[] = "out.png";
    FILE *fp;
    struct wpng_error_type wpng_error;
    struct zint_symbol symbol = {0};
    png_structp png_ptr;
    png_infop info_ptr;

    testStart("test_wpng_error_handler");

    wpng_error.symbol = &symbol;

    // Create empty file
    (void) remove(filename); // In case junk hanging around
    fp = fopen(filename, "w+");
    assert_nonnull(fp, "fopen(%s) failed\n", filename);
    ret = fclose(fp);
    assert_zero(ret, "fclose(%s) %d != 0\n", filename, ret);

    // Re-open for read, which will cause libpng to error
    fp = fopen(filename, "r");
    assert_nonnull(fp, "fopen(%s) for read failed\n", filename);

    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, &wpng_error, wpng_error_handler, NULL);
    assert_nonnull(png_ptr, "png_create_write_struct failed\n");

    info_ptr = png_create_info_struct(png_ptr);
    assert_nonnull(info_ptr, "png_create_info_struct failed\n");

    if (setjmp(wpng_error.jmpbuf)) {
        png_destroy_write_struct(&png_ptr, &info_ptr);
        ret = fclose(fp);
        assert_zero(ret, "fclose(%s) %d != 0\n", filename, ret);
        assert_nonnull(strstr(symbol.errtxt, "635: libpng error:"), "strstr(%s) NULL\n", symbol.errtxt);
        assert_zero(remove(filename), "remove(%s) != 0 (%d: %s)\n", filename, errno, strerror(errno));
    } else {
        png_init_io(png_ptr, fp);

        // This should fail and jmp to setjmp
        png_write_info(png_ptr, info_ptr);
        assert_zero(1, "libpng error setjmp failed\n");
    }

    testFinish();
}

int main(int argc, char *argv[]) {

    testFunction funcs[] = { /* name, func, has_index, has_generate, has_debug */
        { "test_pixel_plot", test_pixel_plot, 1, 0, 1 },
        { "test_print", test_print, 1, 1, 1 },
        { "test_outfile", test_outfile, 0, 0, 0 },
        { "test_wpng_error_handler", test_wpng_error_handler, 0, 0, 0 },
    };

    testRun(argc, argv, funcs, ARRAY_SIZE(funcs));

    testReport();

    return 0;
}