From ffb95d9a143ad17268f7d6d75f56ec2907205c86 Mon Sep 17 00:00:00 2001
From: Joe DeCapo <joe@polka.cat>
Date: Sun, 7 May 2023 15:23:02 -0500
Subject: [PATCH] +libspng

---
 projects/libspng.org/example.c           | 124 +++++++++++++++++++++++
 projects/libspng.org/expected_output.txt |   7 ++
 projects/libspng.org/package.yml         |  31 ++++++
 projects/libspng.org/test.png            | Bin 0 -> 82 bytes
 4 files changed, 162 insertions(+)
 create mode 100644 projects/libspng.org/example.c
 create mode 100644 projects/libspng.org/expected_output.txt
 create mode 100644 projects/libspng.org/package.yml
 create mode 100644 projects/libspng.org/test.png

diff --git a/projects/libspng.org/example.c b/projects/libspng.org/example.c
new file mode 100644
index 00000000..32a4c453
--- /dev/null
+++ b/projects/libspng.org/example.c
@@ -0,0 +1,124 @@
+#include <spng.h>
+
+#include <inttypes.h>
+#include <stdio.h>
+
+int main(int argc, char **argv)
+{
+    int r = 0;
+    FILE *png;
+    char *pngbuf = NULL;
+    spng_ctx *ctx = NULL;
+    unsigned char *out = NULL;
+
+    if(argc < 2)
+    {
+        printf("no input file\n");
+        goto err;
+    }
+
+    png = fopen(argv[1], "rb");
+    if(png == NULL)
+    {
+        printf("error opening input file %s\n", argv[1]);
+        goto err;
+    }
+
+    fseek(png, 0, SEEK_END);
+
+    long siz_pngbuf = ftell(png);
+    rewind(png);
+
+    if(siz_pngbuf < 1) goto err;
+
+    pngbuf = malloc(siz_pngbuf);
+    if(pngbuf == NULL)
+    {
+        printf("malloc() failed\n");
+        goto err;
+    }
+
+    if(fread(pngbuf, siz_pngbuf, 1, png) != 1)
+    {
+        printf("fread() failed\n");
+        goto err;
+    }
+
+    ctx = spng_ctx_new(0);
+    if(ctx == NULL)
+    {
+        printf("spng_ctx_new() failed\n");
+        goto err;
+    }
+
+    r = spng_set_crc_action(ctx, SPNG_CRC_USE, SPNG_CRC_USE);
+
+    if(r)
+    {
+        printf("spng_set_crc_action() error: %s\n", spng_strerror(r));
+        goto err;
+    }
+
+    r = spng_set_png_buffer(ctx, pngbuf, siz_pngbuf);
+
+    if(r)
+    {
+        printf("spng_set_png_buffer() error: %s\n", spng_strerror(r));
+        goto err;
+    }
+
+    struct spng_ihdr ihdr;
+    r = spng_get_ihdr(ctx, &ihdr);
+
+    if(r)
+    {
+        printf("spng_get_ihdr() error: %s\n", spng_strerror(r));
+        goto err;
+    }
+
+    char *clr_type_str;
+    if(ihdr.color_type == SPNG_COLOR_TYPE_GRAYSCALE)
+        clr_type_str = "grayscale";
+    else if(ihdr.color_type == SPNG_COLOR_TYPE_TRUECOLOR)
+        clr_type_str = "truecolor";
+    else if(ihdr.color_type == SPNG_COLOR_TYPE_INDEXED)
+        clr_type_str = "indexed color";
+    else if(ihdr.color_type == SPNG_COLOR_TYPE_GRAYSCALE_ALPHA)
+        clr_type_str = "grayscale with alpha";
+    else
+        clr_type_str = "truecolor with alpha";
+
+    printf("width: %" PRIu32 "\nheight: %" PRIu32 "\n"
+           "bit depth: %" PRIu8 "\ncolor type: %" PRIu8 " - %s\n",
+           ihdr.width, ihdr.height,
+           ihdr.bit_depth, ihdr.color_type, clr_type_str);
+    printf("compression method: %" PRIu8 "\nfilter method: %" PRIu8 "\n"
+           "interlace method: %" PRIu8 "\n",
+           ihdr.compression_method, ihdr.filter_method,
+           ihdr.interlace_method);
+
+    size_t out_size;
+
+    r = spng_decoded_image_size(ctx, SPNG_FMT_RGBA8, &out_size);
+
+    if(r) goto err;
+
+    out = malloc(out_size);
+    if(out == NULL) goto err;
+
+    r = spng_decode_image(ctx, out, out_size, SPNG_FMT_RGBA8, 0);
+
+    if(r)
+    {
+        printf("spng_decode_image() error: %s\n", spng_strerror(r));
+        goto err;
+    }
+
+err:
+    spng_ctx_free(ctx);
+    
+    free(out);
+    free(pngbuf);
+
+    return r;
+}
diff --git a/projects/libspng.org/expected_output.txt b/projects/libspng.org/expected_output.txt
new file mode 100644
index 00000000..ea04929d
--- /dev/null
+++ b/projects/libspng.org/expected_output.txt
@@ -0,0 +1,7 @@
+width: 8
+height: 8
+bit depth: 1
+color type: 3 - indexed color
+compression method: 0
+filter method: 0
+interlace method: 0
diff --git a/projects/libspng.org/package.yml b/projects/libspng.org/package.yml
new file mode 100644
index 00000000..327358ba
--- /dev/null
+++ b/projects/libspng.org/package.yml
@@ -0,0 +1,31 @@
+distributable:
+  url: https://github.com/randy408/libspng/archive/refs/tags/v{{version}}.tar.gz
+  strip-components: 1
+
+versions:
+  gitlab: randy408/libspng
+
+dependencies:
+  darwin:
+    zlib.net: '*'
+
+build:
+  dependencies:
+    tea.xyz/gx/cc: c99
+    ninja-build.org: 1
+    freedesktop.org/pkg-config: '*'
+    mesonbuild.com: '*'
+  working-directory: build
+  script: |
+    meson .. --prefix={{prefix}} --libdir={{prefix}}/lib --buildtype=release
+    ninja -v
+    ninja install -v
+
+test:
+  dependencies:
+    tea.xyz/gx/cc: c99
+  script: |
+    cc example.c -lspng -o example
+    actual_output="$(./example 'test.png')"
+    echo "$actual_output" > actual_output.txt
+    test "$(cat actual_output.txt)" = "$(cat expected_output.txt)"
diff --git a/projects/libspng.org/test.png b/projects/libspng.org/test.png
new file mode 100644
index 0000000000000000000000000000000000000000..18d7a15a9b6204ab5ba01cc1855ae91624fcb1a4
GIT binary patch
literal 82
zcmeAS@N?(olHy`uVBq!ia0vp^93afd3?%;@)Hwm9m;-!5Tp1YtcU4>p2XeVQT^vI=
cWRo3$N(2}fXF7A91d1|vy85}Sb4q9e0Bvv(uK)l5

literal 0
HcmV?d00001