Visualises per-byte perplexity of the compressed data in an LZMA file.
./LzmaSpec foo.lzma
contrib/parsemap.py can be used to show the compression ratio of separate
symbols in an ELF file, given the LZMA-compressed ELF file and the
corresponding linker map file. (See the cc(1) and ld(1) manpages for notes
on how to output these when linking.)
usage: parsemap.py [-h] [--recurse RECURSE] [--lzmaspec LZMASPEC] lzma_file
map_file
Shows a summary of the compression stats of every symbol in an ELF, given the
compressed and uncompressed ELF files, as well as a linker map file.
(`ld -Map', `cc -Wl,-Map', see respective manpages.)
positional arguments:
lzma_file The LZMA-compressed ELF file
map_file The linker map file
optional arguments:
-h, --help show this help message and exit
--recurse RECURSE Recursively analyse data in symbols. Syntax:
--recurse symname=linker.map
--lzmaspec LZMASPEC LzmaSpec binary to use (default: ./LzmaSpec)
$ contrib/parsemap.py --recurse dtn_snd=introtree/snd/bin/snd.ld.map \
introtree/bin/main.smol{.vndh.z,.map}
Symbol Uncompr. Size Perplexity Perplexity/Size
-------------------------------------------------------------------
dtn_snd -> *(.igot) 10195 591.26 0.06
main 595 256.30 0.43
dtn_snd -> Clinkster_GenerateMusic 707 247.99 0.35
dtn_snd -> _start 540 201.28 0.37
dtn_frag_glsl 385 144.75 0.38
_DYNAMIC 312 126.19 0.40
dtn_snd -> Clinkster_WavFileHeader 164 62.93 0.38
SDL_GL_CreateContext 164 36.57 0.22
_smol_origin 224 35.54 0.16
_start 39 21.01 0.54
dtn_snd -> .text.clinkster.genMus 26 14.26 0.55
dtn_snd -> *(.elf.end) 2502 11.09 0.00
glClearColor 8 3.50 0.44
glCreateShaderProgramv 8 3.46 0.43
__libc_start_main 8 3.44 0.43
glViewport 8 3.22 0.40
glUseProgram 8 3.20 0.40
glClear 8 3.16 0.40
glRecti 8 3.10 0.39
SDL_Init 8 3.07 0.38
SDL_DestroyWindow 8 3.06 0.38
SDL_CreateWindow 8 3.05 0.38
SDL_GetTicks 8 3.00 0.37
glUniform1f 8 2.98 0.37
SDL_GL_SetAttribute 8 2.97 0.37
SDL_GL_DeleteContext 8 2.96 0.37
SDL_GL_SwapWindow 8 2.87 0.36
SDL_PollEvent 8 2.81 0.35
SDL_Quit 8 2.57 0.32
_smol_data_start 12 1.21 0.10
glUniform2i 8 1.05 0.13
dtn_snd -> Clinkster_MusicBuffer 8 0.92 0.12
dtn_snd -> *(.text.unlikely_.text. 1 0.78 0.78
dtn_snd -> *(.plt.sec) 1 0.77 0.77
dtn_snd -> *(.text.hot_.text.hot.* 1 0.70 0.70
dtn_snd -> *(.text.exit_.text.exit 1 0.66 0.66
dtn_snd -> [0x08048094] 1 0.62 0.62
dtn_snd -> *(.text.startup_.text.s 1 0.61 0.61
_smol_text_start 1 0.57 0.57
dtn_snd -> *(.exception_ranges_.ex 1 0.49 0.49
dtn_snd -> *(.text) 1 0.48 0.48
dtn_snd -> .rodata.clinkster.velfa 1 0.32 0.32
_smol_text_end 1 0.27 0.27
dtn_snd -> __bss_start 2 0.23 0.12
dtn_snd -> _edata 1 0.12 0.12
dtn_snd -> *(.data1) 1 0.12 0.12
dtn_snd -> *(.gnu.warning) 1 0.01 0.01