imports/ImHex-Patterns
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patterns: Added PNG Pattern (#27)

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* starting to flesh out a pattern for PNG

* using defines to improve readability

* data type changes to wip png pattern

* read png chunks until end of file

* iccp chunk and commenting

* Move IHDR out of array

* Function and pointer fixes

Co-authored-by: Foster Brereton <fbrereto@adobe.com>
This commit is contained in:
Quentin Fan-Chiang
2022-02-09 10:56:04 -05:00
committed by GitHub
parent 16d189843a
commit 97ccc8c418
2 changed files with 87 additions and 0 deletions
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README.md
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@@ -25,6 +25,7 @@ Hex patterns, include patterns and magic files for the use with the ImHex Hex Ed
| Java Class | `application/x-java-applet` | `patterns/java_class.hexpat` | Java Class files |
| ARM VTOR | | `patterns/arm_cm_vtor.hexpat` | ARM Cortex M Vector Table Layout |
| ICO | | `patterns/ico.hexpat` | Icon (.ico) or Cursor (.cur) files |
| PNG | `image/png` | `patterns/png.hexpat` | PNG image files |
### Scripts

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patterns/png.hexpat Normal file
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@@ -0,0 +1,86 @@
#pragma MIME image/png
#pragma endian big
struct header_t
{
u8 highBitByte;
char signature[3];
char dosLineEnding[2];
char dosEOF;
char unixLineEnding;
};
struct ihdr_t
{
u32 width [[comment("Image width")]];
u32 height [[comment("Image height")]];
u8 bit_depth;
u8 color_type [[comment("PNG Image Type\n0: greyscale\n2: truecolour\n3: indexed-color\n4: greyscale with alpha\n6: truecolour with alpha")]];
u8 compression_method;
u8 filter_method;
u8 interlace_method [[comment("values 0 \"no interlace\" or 1 \"Adam7 interlace\"")]];
};
struct palette_entry_t {
u8 r;
u8 g;
u8 b;
};
struct phys_t {
u32 ppu_x [[comment("Pixels per unit, X axis")]];
u32 ppu_y [[comment("Pixels per unit, Y axis")]];
u8 unit [[comment("Unit Specifier\n0: unit is unknown\n1: unit is the metre")]];
};
struct itxt_t {
char keyword[];
u8 compression_flag;
u8 compression_method;
char language_tag[];
char translated_keyword[];
char text[parent.length - ($ - addressof(keyword))];
};
struct iccp_t {
char profile [];
u8 compression_method;
u8 compressed_profile[parent.length - ($ - addressof(profile))];
};
struct chunk_t {
u32 length [[color("17BECF")]];
char type[4];
#define IHDR_k "IHDR"
#define PLTE_k "PLTE"
#define pHYs_k "pHYs"
#define iTXt_k "iTXt"
#define IDAT_k "IDAT"
#define IEND_k "IEND"
#define gAMA_k "gAMA"
#define iCCP_k "iCCP"
if (type == IHDR_k) {
ihdr_t ihdr [[comment("Image Header chunk"), name("IHDR")]];
} else if (type == PLTE_k) {
palette_entry_t entries[length / 3];
} else if (type == pHYs_k) {
phys_t phys;
} else if (type == iTXt_k) {
itxt_t text;
} else if (type == gAMA_k) {
u32 gamma [[name("image gamma"), comment("4 byte unsigned integer representing gamma times 100000")]];
} else if (type == iCCP_k) {
iccp_t iccp;
} else {
u8 data[length];
}
u32 crc;
};
header_t header @ 0x00 [[comment("PNG file signature"), name("Signature")]];
chunk_t ihdr_chunk @ 0x08 [[comment("PNG Header chunk"), name("IHDR")]];
chunk_t chunk_set[while(builtin::std::mem::read_string($ + 4, 4) != "IEND")] @ $ [[comment("PNG file chunks"), name("Chunks"), inline]];
chunk_t iend_chunk @ $ [[name("IEND"), comment("Image End Chunk")]];