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|
From 4f8e26f2a40ffaa3a5b77be6a49989a1a42e2b83 Mon Sep 17 00:00:00 2001
From: "Christoph M. Becker" <cmbecker69@gmx.de>
Date: Tue, 16 Aug 2016 14:27:23 +0200
Subject: [PATCH] Fix #290: TGA RLE decoding is broken
We make it work only, for now. Actually, it doesn't make sense that
`oTga::bitmap` is an `int *` as we're storing only bytes there. If this
will be changed, we can even get rid of the `conversion_buffer` in
`read_image_tga` altogether, and read the image data into the
`decompression_buffer` (if RLE'd) or the `tga->bitmap` (if uncompressed)
directly.
Upstream-Status: Backport
Signed-off-by: Catalin Enache <catalin.enache@windriver.com>
---
src/gd_tga.c | 18 ++++++++++--------
tests/tga/CMakeLists.txt | 1 +
tests/tga/Makemodule.am | 8 ++++++--
tests/tga/tga_read.c | 40 ++++++++++++++++++++++++++++++++++++++++
tests/tga/tga_read_rgb.png | Bin 0 -> 2349 bytes
tests/tga/tga_read_rgb.tga | Bin 0 -> 90444 bytes
tests/tga/tga_read_rgb_rle.tga | Bin 0 -> 9987 bytes
7 files changed, 57 insertions(+), 10 deletions(-)
create mode 100644 tests/tga/tga_read.c
create mode 100644 tests/tga/tga_read_rgb.png
create mode 100644 tests/tga/tga_read_rgb.tga
create mode 100644 tests/tga/tga_read_rgb_rle.tga
diff --git a/src/gd_tga.c b/src/gd_tga.c
index ec6781f..8737b04 100644
--- a/src/gd_tga.c
+++ b/src/gd_tga.c
@@ -207,12 +207,13 @@ int read_image_tga( gdIOCtx *ctx, oTga *tga )
{
int pixel_block_size = (tga->bits / 8);
int image_block_size = (tga->width * tga->height) * pixel_block_size;
- uint8_t* decompression_buffer = NULL;
+ int* decompression_buffer = NULL;
unsigned char* conversion_buffer = NULL;
int buffer_caret = 0;
int bitmap_caret = 0;
int i = 0;
int encoded_pixels;
+ int rle_size;
if(overflow2(tga->width, tga->height)) {
return -1;
@@ -266,7 +267,7 @@ int read_image_tga( gdIOCtx *ctx, oTga *tga )
/*! \brief Read in RLE compressed RGB TGA
* Chunk load the pixel data from an RLE compressed RGB type TGA.
*/
- decompression_buffer = (uint8_t*) gdMalloc(image_block_size * sizeof(uint8_t));
+ decompression_buffer = (int*) gdMalloc(image_block_size * sizeof(int));
if (decompression_buffer == NULL) {
return -1;
}
@@ -277,7 +278,8 @@ int read_image_tga( gdIOCtx *ctx, oTga *tga )
return -1;
}
- if (gdGetBuf(conversion_buffer, image_block_size, ctx) != image_block_size) {
+ rle_size = gdGetBuf(conversion_buffer, image_block_size, ctx);
+ if (rle_size <= 0) {
gdFree(conversion_buffer);
gdFree(decompression_buffer);
return -1;
@@ -285,7 +287,7 @@ int read_image_tga( gdIOCtx *ctx, oTga *tga )
buffer_caret = 0;
- while( buffer_caret < image_block_size) {
+ while( buffer_caret < rle_size) {
decompression_buffer[buffer_caret] = (int)conversion_buffer[buffer_caret];
buffer_caret++;
}
@@ -298,14 +300,14 @@ int read_image_tga( gdIOCtx *ctx, oTga *tga )
encoded_pixels = ( ( decompression_buffer[ buffer_caret ] & ~TGA_RLE_FLAG ) + 1 );
buffer_caret++;
- if ((bitmap_caret + (encoded_pixels * pixel_block_size)) >= image_block_size) {
+ if ((bitmap_caret + (encoded_pixels * pixel_block_size)) > image_block_size) {
gdFree( decompression_buffer );
gdFree( conversion_buffer );
return -1;
}
for (i = 0; i < encoded_pixels; i++) {
- memcpy(tga->bitmap + bitmap_caret, decompression_buffer + buffer_caret, pixel_block_size);
+ memcpy(tga->bitmap + bitmap_caret, decompression_buffer + buffer_caret, pixel_block_size * sizeof(int));
bitmap_caret += pixel_block_size;
}
buffer_caret += pixel_block_size;
@@ -314,13 +316,13 @@ int read_image_tga( gdIOCtx *ctx, oTga *tga )
encoded_pixels = decompression_buffer[ buffer_caret ] + 1;
buffer_caret++;
- if ((bitmap_caret + (encoded_pixels * pixel_block_size)) >= image_block_size) {
+ if ((bitmap_caret + (encoded_pixels * pixel_block_size)) > image_block_size) {
gdFree( decompression_buffer );
gdFree( conversion_buffer );
return -1;
}
- memcpy(tga->bitmap + bitmap_caret, decompression_buffer + buffer_caret, encoded_pixels * pixel_block_size);
+ memcpy(tga->bitmap + bitmap_caret, decompression_buffer + buffer_caret, encoded_pixels * pixel_block_size * sizeof(int));
bitmap_caret += (encoded_pixels * pixel_block_size);
buffer_caret += (encoded_pixels * pixel_block_size);
}
diff --git a/tests/tga/CMakeLists.txt b/tests/tga/CMakeLists.txt
index c3a589c..789fb14 100644
--- a/tests/tga/CMakeLists.txt
+++ b/tests/tga/CMakeLists.txt
@@ -5,6 +5,7 @@ LIST(APPEND TESTS_FILES
bug00247a
bug00248
bug00248a
+ tga_read
)
ADD_GD_TESTS()
diff --git a/tests/tga/Makemodule.am b/tests/tga/Makemodule.am
index dff828f..a1e6af6 100644
--- a/tests/tga/Makemodule.am
+++ b/tests/tga/Makemodule.am
@@ -4,7 +4,8 @@ libgd_test_programs += \
tga/bug00247a \
tga/bug00248 \
tga/bug00248a \
- tga/tga_null
+ tga/tga_null \
+ tga/tga_read
EXTRA_DIST += \
tga/CMakeLists.txt \
@@ -12,4 +13,7 @@ EXTRA_DIST += \
tga/bug00247.tga \
tga/bug00247a.tga \
tga/bug00248.tga \
- tga/bug00248a.tga
+ tga/bug00248a.tga \
+ tga/tga_read_rgb.png \
+ tga/tga_read_rgb.tga \
+ tga/tga_read_rgb_rle.tga
diff --git a/tests/tga/tga_read.c b/tests/tga/tga_read.c
new file mode 100644
index 0000000..310b72f
--- /dev/null
+++ b/tests/tga/tga_read.c
@@ -0,0 +1,40 @@
+/**
+ * Basic test case for reading TGA files.
+ */
+
+
+#include "gd.h"
+#include "gdtest.h"
+
+
+static void assert_equals(char *exp, char *orig);
+
+
+int main()
+{
+ assert_equals("tga_read_rgb.png", "tga_read_rgb.tga");
+ assert_equals("tga_read_rgb.png", "tga_read_rgb_rle.tga");
+
+ return gdNumFailures();
+}
+
+
+static void assert_equals(char *exp, char *orig)
+{
+ gdImagePtr im;
+ FILE *fp;
+ char *filename;
+
+ fp = gdTestFileOpen2("tga", orig);
+ gdTestAssertMsg(fp != NULL, "can't open %s", orig);
+
+ im = gdImageCreateFromTga(fp);
+ gdTestAssertMsg(im != NULL, "can't read %s", orig);
+ fclose(fp);
+
+ filename = gdTestFilePath2("tga", exp);
+ gdAssertImageEqualsToFile(filename, im);
+ gdFree(filename);
+
+ gdImageDestroy(im);
+}
diff --git a/tests/tga/tga_read_rgb.png b/tests/tga/tga_read_rgb.png
new file mode 100644
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diff --git a/tests/tga/tga_read_rgb.tga b/tests/tga/tga_read_rgb.tga
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diff --git a/tests/tga/tga_read_rgb_rle.tga b/tests/tga/tga_read_rgb_rle.tga
new file mode 100644
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--
2.10.2
|
