Filter for ARM-Thumb binaries. More...

#include "simple_private.h"

Functions
static size_t	armthumb_code (void simple lzma_attribute((__unused__)), uint32_t now_pos, bool is_encoder, uint8_t buffer, size_t size)

static lzma_ret	armthumb_coder_init (lzma_next_coder next, const lzma_allocator allocator, const lzma_filter_info *filters, bool is_encoder)

lzma_ret	lzma_simple_armthumb_encoder_init (lzma_next_coder next, const lzma_allocator allocator, const lzma_filter_info *filters)

lzma_ret	lzma_simple_armthumb_decoder_init (lzma_next_coder next, const lzma_allocator allocator, const lzma_filter_info *filters)

Detailed Description

Filter for ARM-Thumb binaries.

Definition in file armthumb.c.

Function Documentation

◆ armthumb_code()

static size_t armthumb_code	(	void *simple	lzma_attribute(__unused__),
		uint32_t	now_pos,
		bool	is_encoder,
		uint8_t *	buffer,
		size_t	size
	)

static

Definition at line 18 of file armthumb.c.

 {
     size_t i;
     for (i = 0; i + 4 <= size; i += 2) {
         if ((buffer[i + 1] & 0xF8) == 0xF0
                 && (buffer[i + 3] & 0xF8) == 0xF8) {
             uint32_t src = (((uint32_t)(buffer[i + 1]) & 7) << 19)
                 | ((uint32_t)(buffer[i + 0]) << 11)
                 | (((uint32_t)(buffer[i + 3]) & 7) << 8)
                 | (uint32_t)(buffer[i + 2]);
  
             src <<= 1;
  
             uint32_t dest;
             if (is_encoder)
                 dest = now_pos + (uint32_t)(i) + 4 + src;
             else
                 dest = src - (now_pos + (uint32_t)(i) + 4);
  
             dest >>= 1;
             buffer[i + 1] = 0xF0 | ((dest >> 19) & 0x7);
             buffer[i + 0] = (dest >> 11);
             buffer[i + 3] = 0xF8 | ((dest >> 8) & 0x7);
             buffer[i + 2] = (dest);
             i += 2;
         }
     }
  
     return i;
 }

References dest, i, and src.

Referenced by armthumb_coder_init().

◆ armthumb_coder_init()

static lzma_ret armthumb_coder_init	(	lzma_next_coder *	next,
		const lzma_allocator *	allocator,
		const lzma_filter_info *	filters,
		bool	is_encoder
	)

static

Definition at line 53 of file armthumb.c.

 {
     return lzma_simple_coder_init(next, allocator, filters,
             &armthumb_code, 0, 4, 2, is_encoder);
 }

References allocator, armthumb_code(), filters, and lzma_simple_coder_init().

Referenced by lzma_simple_armthumb_decoder_init(), and lzma_simple_armthumb_encoder_init().

◆ lzma_simple_armthumb_decoder_init()

lzma_ret lzma_simple_armthumb_decoder_init	(	lzma_next_coder *	next,
		const lzma_allocator *	allocator,
		const lzma_filter_info *	filters
	)

Definition at line 71 of file armthumb.c.

 {
     return armthumb_coder_init(next, allocator, filters, false);
 }

References allocator, armthumb_coder_init(), and filters.

◆ lzma_simple_armthumb_encoder_init()

lzma_ret lzma_simple_armthumb_encoder_init	(	lzma_next_coder *	next,
		const lzma_allocator *	allocator,
		const lzma_filter_info *	filters
	)

Definition at line 62 of file armthumb.c.

 {
     return armthumb_coder_init(next, allocator, filters, true);
 }