From 5766b39845b93a0539ae223ee50067bde1e742e1 Mon Sep 17 00:00:00 2001
From: gitlost <burmartke@gmail.com>
Date: Sat, 18 Sep 2021 17:15:16 +0100
Subject: [PATCH] gif.c: use malloc instead of alloca for LZW buffer as fails
 for large scale

---
 backend/gif.c                                 |  38 +++++---
 .../gif/itf14_height61.8_bind4_wsp24_3.gif    | Bin 0 -> 17503 bytes
 backend/tests/test_gif.c                      |  89 +++++++++++++-----
 3 files changed, 87 insertions(+), 40 deletions(-)
 create mode 100644 backend/tests/data/gif/itf14_height61.8_bind4_wsp24_3.gif

diff --git a/backend/gif.c b/backend/gif.c
index f341f188..5cfbe891 100644
--- a/backend/gif.c
+++ b/backend/gif.c
@@ -41,7 +41,8 @@
 #include <malloc.h>
 #endif
 
-#define SSET    "0123456789ABCDEF"
+/* Limit initial ZLW buffer size to this in expectation that compressed data will fit for typical scalings */
+#define GIF_ZLW_PAGE_SIZE   0x100000 /* Megabyte */
 
 typedef struct s_statestruct {
     unsigned char *pOut;
@@ -95,8 +96,15 @@ static int BufferNextByte(statestruct *pState) {
         pState->OutByteCountPos = pState->OutPosCur;
         (pState->OutPosCur)++;
     }
-    if (pState->OutPosCur >= pState->OutLength)
-        return 1;
+    if (pState->OutPosCur >= pState->OutLength) {
+        unsigned char *pOut;
+        pState->OutLength += GIF_ZLW_PAGE_SIZE;
+        /* Note pState->pOut not free()d by realloc() on failure */
+        if (!(pOut = (unsigned char *) realloc(pState->pOut, pState->OutLength))) {
+            return 1;
+        }
+        pState->pOut = pOut;
+    }
 
     (pState->pOut)[pState->OutPosCur] = 0x00;
     return 0;
@@ -301,15 +309,9 @@ INTERNAL int gif_pixel_plot(struct zint_symbol *symbol, unsigned char *pixelbuf)
 
     /* Allow for overhead of 4 == code size + byte count + overflow byte + zero terminator */
     unsigned int lzoutbufSize = bitmapSize + 4;
-#ifdef _MSC_VER
-    char *lzwoutbuf;
-#endif
-
-#ifndef _MSC_VER
-    char lzwoutbuf[lzoutbufSize];
-#else
-    lzwoutbuf = (char *) _alloca(lzoutbufSize);
-#endif /* _MSC_VER */
+    if (lzoutbufSize > GIF_ZLW_PAGE_SIZE) {
+        lzoutbufSize = GIF_ZLW_PAGE_SIZE;
+    }
 
     /*
      * Build a table of the used palette items.
@@ -582,19 +584,27 @@ INTERNAL int gif_pixel_plot(struct zint_symbol *symbol, unsigned char *pixelbuf)
     /* prepare state array */
     State.pIn = pixelbuf;
     State.InLen = bitmapSize;
-    State.pOut = (unsigned char *) lzwoutbuf;
+    if (!(State.pOut = (unsigned char *) malloc(lzoutbufSize))) {
+        if (!output_to_stdout) {
+            fclose(gif_file);
+        }
+        strcpy(symbol->errtxt, "614: Insufficient memory for LZW buffer");
+        return ZINT_ERROR_MEMORY;
+    }
     State.OutLength = lzoutbufSize;
 
     /* call lzw encoding */
     byte_out = gif_lzw(&State, paletteBitSize);
     if (byte_out <= 0) {
+        free(State.pOut);
         if (!output_to_stdout) {
             fclose(gif_file);
         }
         strcpy(symbol->errtxt, "613: Insufficient memory for LZW buffer");
         return ZINT_ERROR_MEMORY;
     }
-    fwrite(lzwoutbuf, byte_out, 1, gif_file);
+    fwrite((const char *) State.pOut, byte_out, 1, gif_file);
+    free(State.pOut);
 
     /* GIF terminator */
     fputc('\x3b', gif_file);
diff --git a/backend/tests/data/gif/itf14_height61.8_bind4_wsp24_3.gif b/backend/tests/data/gif/itf14_height61.8_bind4_wsp24_3.gif
new file mode 100644
index 0000000000000000000000000000000000000000..f8bfb1eefcc49ee2d274c557b088e3f2d65a0f59
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/backend/tests/test_gif.c b/backend/tests/test_gif.c
index 763cc69e..6e84e33a 100644
--- a/backend/tests/test_gif.c
+++ b/backend/tests/test_gif.c
@@ -129,37 +129,40 @@ static void test_print(int index, int generate, int debug) {
         int whitespace_height;
         int option_1;
         int option_2;
+        float height;
         float scale;
         float dot_size;
         char *fgcolour;
         char *bgcolour;
         char *data;
         char *expected_file;
+        char *comment;
     };
     struct item data[] = {
-        /*  0*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 0, "", "", "12", "dotcode_1.0.gif" },
-        /*  1*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 0.1, "", "", "12", "dotcode_1.0_ds0.1.gif" },
-        /*  2*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 1.1, "", "", "12", "dotcode_1.0_ds1.1.gif" },
-        /*  3*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 1.5, 0, "", "", "12", "dotcode_1.5.gif" },
-        /*  4*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 1.5, 0.4, "", "", "12", "dotcode_1.5_ds0.4.gif" },
-        /*  5*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 1.5, 1.1, "", "", "12", "dotcode_1.5_ds1.1.gif" },
-        /*  6*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 1.5, 2.1, "", "", "12", "dotcode_1.5_ds2.1.gif" },
-        /*  7*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 2, 0, "", "", "12", "dotcode_2.0.gif" },
-        /*  8*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 2, 0.9, "", "", "12", "dotcode_2.0_ds0.9.gif" },
-        /*  9*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 2, 1.1, "", "", "12", "dotcode_2.0_ds1.1.gif" },
-        /* 10*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 3, 0, "", "", "12", "dotcode_3.0.gif" },
-        /* 11*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 3, 0.4, "", "", "12", "dotcode_3.0_ds0.4.gif" },
-        /* 12*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 3, 1.1, "", "", "12", "dotcode_3.0_ds1.1.gif" },
-        /* 13*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 3.5, 0, "", "", "12", "dotcode_3.5.gif" },
-        /* 14*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 3.5, 0.4, "", "", "12", "dotcode_3.5_ds0.4.gif" },
-        /* 15*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 3.5, 1.1, "", "", "12", "dotcode_3.5_ds1.1.gif" },
-        /* 16*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 5, 0, "", "", "12", "dotcode_5.0.gif" },
-        /* 17*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 5, 0.2, "", "", "12", "dotcode_5.0_ds0.2.gif" },
-        /* 18*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 5, 1.1, "", "", "12", "dotcode_5.0_ds1.1.gif" },
-        /* 19*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 5, 1.7, "", "", "12", "dotcode_5.0_ds1.7.gif" },
-        /* 20*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 0, "2674C344", "FDFFC2CC", "12", "dotcode_bgfgalpha.gif" },
-        /* 21*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 0, "00000000", "FFFFFF00", "12", "dotcode_bgfgtrans.gif" },
-        /* 22*/ { BARCODE_ULTRA, 1, BARCODE_BOX, 1, 1, -1, -1, 0, 0, "0000FF", "FF0000", "12", "ultra_fgbg_hvwsp1_box1.gif" },
+        /*  0*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 0, 0, "", "", "12", "dotcode_1.0.gif", "" },
+        /*  1*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 0, 0.1, "", "", "12", "dotcode_1.0_ds0.1.gif", "" },
+        /*  2*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 0, 1.1, "", "", "12", "dotcode_1.0_ds1.1.gif", "" },
+        /*  3*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 1.5, 0, "", "", "12", "dotcode_1.5.gif", "" },
+        /*  4*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 1.5, 0.4, "", "", "12", "dotcode_1.5_ds0.4.gif", "" },
+        /*  5*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 1.5, 1.1, "", "", "12", "dotcode_1.5_ds1.1.gif", "" },
+        /*  6*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 1.5, 2.1, "", "", "12", "dotcode_1.5_ds2.1.gif", "" },
+        /*  7*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 2, 0, "", "", "12", "dotcode_2.0.gif", "" },
+        /*  8*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 2, 0.9, "", "", "12", "dotcode_2.0_ds0.9.gif", "" },
+        /*  9*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 2, 1.1, "", "", "12", "dotcode_2.0_ds1.1.gif", "" },
+        /* 10*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 3, 0, "", "", "12", "dotcode_3.0.gif", "" },
+        /* 11*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 3, 0.4, "", "", "12", "dotcode_3.0_ds0.4.gif", "" },
+        /* 12*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 3, 1.1, "", "", "12", "dotcode_3.0_ds1.1.gif", "" },
+        /* 13*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 3.5, 0, "", "", "12", "dotcode_3.5.gif", "" },
+        /* 14*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 3.5, 0.4, "", "", "12", "dotcode_3.5_ds0.4.gif", "" },
+        /* 15*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 3.5, 1.1, "", "", "12", "dotcode_3.5_ds1.1.gif", "" },
+        /* 16*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 5, 0, "", "", "12", "dotcode_5.0.gif", "" },
+        /* 17*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 5, 0.2, "", "", "12", "dotcode_5.0_ds0.2.gif", "" },
+        /* 18*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 5, 1.1, "", "", "12", "dotcode_5.0_ds1.1.gif", "" },
+        /* 19*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 5, 1.7, "", "", "12", "dotcode_5.0_ds1.7.gif", "" },
+        /* 20*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 0, 0, "2674C344", "FDFFC2CC", "12", "dotcode_bgfgalpha.gif", "" },
+        /* 21*/ { BARCODE_DOTCODE, -1, -1, -1, -1, -1, -1, 0, 0, 0, "00000000", "FFFFFF00", "12", "dotcode_bgfgtrans.gif", "" },
+        /* 22*/ { BARCODE_ULTRA, 1, BARCODE_BOX, 1, 1, -1, -1, 0, 0, 0, "0000FF", "FF0000", "12", "ultra_fgbg_hvwsp1_box1.gif", "" },
+        /* 23*/ { BARCODE_ITF14, 4, BARCODE_BIND, 24, -1, -1, -1, 61.8, 3, 0, "", "", "0501054800395", "itf14_height61.8_bind4_wsp24_3.gif", "#204 ARM-Cortex crash" },
     };
     int data_size = ARRAY_SIZE(data);
     int i, length, ret;
@@ -201,6 +204,9 @@ static void test_print(int index, int generate, int debug) {
         if (data[i].whitespace_height != -1) {
             symbol->whitespace_height = data[i].whitespace_height;
         }
+        if (data[i].height) {
+            symbol->height = data[i].height;
+        }
         if (data[i].scale) {
             symbol->scale = data[i].scale;
         }
@@ -224,11 +230,11 @@ static void test_print(int index, int generate, int debug) {
         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, %d, %s, %d, %d, %d, %d, %.5g, %.5g, \"%s\", \"%s\", \"%s\", \"%s\" },\n",
+            printf("        /*%3d*/ { %s, %d, %s, %d, %d, %d, %d, %.5g, %.5g, %.5g, \"%s\", \"%s\", \"%s\", \"%s\", \"%s\" },\n",
                     i, testUtilBarcodeName(data[i].symbology), data[i].border_width, testUtilOutputOptionsName(data[i].output_options),
                     data[i].whitespace_width, data[i].whitespace_height,
-                    data[i].option_1, data[i].option_2, data[i].scale, data[i].dot_size, data[i].fgcolour, data[i].bgcolour,
-                    testUtilEscape(data[i].data, length, escaped, escaped_size), data[i].expected_file);
+                    data[i].option_1, data[i].option_2, data[i].height, data[i].scale, data[i].dot_size, data[i].fgcolour, data[i].bgcolour,
+                    testUtilEscape(data[i].data, length, escaped, escaped_size), 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) {
@@ -275,12 +281,43 @@ static void test_outfile(void) {
     testFinish();
 }
 
+static void test_large_scale(int debug) {
+    int length, ret;
+    struct zint_symbol symbol = {0};
+    char data[] = "1";
+
+    testStart("test_large_scale");
+
+    length = (int) strlen(data);
+
+    symbol.symbology = BARCODE_ITF14;
+    strcpy(symbol.fgcolour, "000000");
+    strcpy(symbol.bgcolour, "ffffff");
+    strcpy(symbol.outfile, "out.gif");
+    // X-dimension 0.27mm * 95 = 25.65 ~ 25 pixels so 12.5 gives 95 dpmm (2400 dpi)
+    symbol.scale = 12.5f; // 70.0f would cause re-alloc as LZW > 1MB but very slow
+    symbol.dot_size = 4.0f / 5.0f;
+
+    ret = ZBarcode_Encode_and_Print(&symbol, (unsigned char *) data, length, 0 /*rotate_angle*/);
+    assert_zero(ret, "%s ZBarcode_Encode_and_Print ret %d != 0 %s\n", testUtilBarcodeName(symbol.symbology), ret, symbol.errtxt);
+
+    if (!(debug & ZINT_DEBUG_TEST_KEEP_OUTFILE)) { /* -d 64 */
+        // 129.1 kB file manually inspected and checked (1.1 MB file for scale 70.0f also checked)
+        assert_zero(remove(symbol.outfile), "remove(%s) != 0\n", symbol.outfile);
+    }
+
+    ZBarcode_Clear(&symbol);
+
+    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_large_scale", test_large_scale, 0, 0, 1 },
     };
 
     testRun(argc, argv, funcs, ARRAY_SIZE(funcs));