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- [FIX] uncompress() cleanup

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This commit is contained in:
Raimon Zamora
2025-11-24 14:30:11 +01:00
parent 3383b415cd
commit a7cbdea4c5
2 changed files with 14 additions and 27 deletions
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39
gif.h
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@@ -22,19 +22,12 @@ struct dictionary_entry_t
void uncompress( int code_length, const uint8_t *input, int input_length, uint8_t *out ) void uncompress( int code_length, const uint8_t *input, int input_length, uint8_t *out )
{ {
int i, bit;
int code, prev = -1;
dictionary_entry_t *dictionary; dictionary_entry_t *dictionary;
int dictionary_ind; int dictionary_ind;
uint32_t mask = 0x01;
int reset_code_length;
int clear_code; // This varies depending on code_length
int stop_code; // one more than clear code
int match_len;
clear_code = 1 << ( code_length ); const int clear_code = 1 << ( code_length );
stop_code = clear_code + 1; const int stop_code = clear_code + 1;
reset_code_length = code_length; const int reset_code_length = code_length;
dictionary = ( dictionary_entry_t * ) dictionary = ( dictionary_entry_t * )
malloc( sizeof( dictionary_entry_t ) * ( 1 << ( code_length + 1 ) ) ); malloc( sizeof( dictionary_entry_t ) * ( 1 << ( code_length + 1 ) ) );
@@ -47,12 +40,15 @@ void uncompress( int code_length, const uint8_t *input, int input_length, uint8_
} }
dictionary_ind+=2; dictionary_ind+=2;
int prev = -1;
uint32_t mask = 0x01;
while ( input_length ) while ( input_length )
{ {
code = 0x0; int code = 0x0;
for (i=0; i<(code_length + 1); i++)
for (int i=0; i<(code_length + 1); i++)
{ {
bit = ( *input & mask ) ? 1 : 0; const int bit = ( *input & mask ) ? 1 : 0;
mask <<= 1; mask <<= 1;
if ( mask == 0x100 ) if ( mask == 0x100 )
@@ -90,18 +86,9 @@ void uncompress( int code_length, const uint8_t *input, int input_length, uint8_
exit( 0 ); exit( 0 );
} }
if ( code == dictionary_ind ) int ptr = (code == dictionary_ind) ? prev : code;
{ while ( dictionary[ ptr ].prev != -1 ) ptr = dictionary[ ptr ].prev;
int ptr = prev; dictionary[ dictionary_ind ].byte = dictionary[ ptr ].byte;
while ( dictionary[ ptr ].prev != -1 ) ptr = dictionary[ ptr ].prev;
dictionary[ dictionary_ind ].byte = dictionary[ ptr ].byte;
}
else
{
int ptr = code;
while ( dictionary[ ptr ].prev != -1 ) ptr = dictionary[ ptr ].prev;
dictionary[ dictionary_ind ].byte = dictionary[ ptr ].byte;
}
dictionary[ dictionary_ind ].prev = prev; dictionary[ dictionary_ind ].prev = prev;
dictionary[ dictionary_ind ].len = dictionary[ prev ].len + 1; dictionary[ dictionary_ind ].len = dictionary[ prev ].len + 1;
@@ -116,7 +103,7 @@ void uncompress( int code_length, const uint8_t *input, int input_length, uint8_
prev = code; prev = code;
match_len = dictionary[ code ].len; const int match_len = dictionary[ code ].len;
while ( code != -1 ) while ( code != -1 )
{ {
out[ dictionary[ code ].len - 1 ] = dictionary[ code ].byte; out[ dictionary[ code ].len - 1 ] = dictionary[ code ].byte;

2
version.h
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@@ -1,3 +1,3 @@
#pragma once #pragma once
#define MINI_VERSION "1.3.10" #define MINI_VERSION "1.3.11"