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Fix problems encoding binary in Aztec mode

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Bugs found by John Mortlock
Fixes #71
This commit is contained in:
Robin Stuart 2017-10-04 05:05:58 +01:00
parent 4c1c180fbf
commit 5bc7399252
1 changed files with 17 additions and 14 deletions
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31
backend/aztec.c
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@ -59,7 +59,7 @@ static int count_doubles(const unsigned char source[], const int posn, const siz
return c;
}
static int count_cr(char source[], int posn, int length) {
static int count_cr(unsigned char source[], int posn, int length) {
int c = 0;
int i = posn;
int cond = 1;
@ -76,7 +76,7 @@ static int count_cr(char source[], int posn, int length) {
return c;
}
static int count_dotcomma(char source[], int posn, int length) {
static int count_dotcomma(unsigned char source[], int posn, int length) {
int c = 0;
int i = posn;
int cond = 1;
@ -93,7 +93,7 @@ static int count_dotcomma(char source[], int posn, int length) {
return c;
}
static int count_spaces(char source[], int posn, int length) {
static int count_spaces(unsigned char source[], int posn, int length) {
int c = 0;
int i = posn;
int cond = 1;
@ -130,13 +130,13 @@ static int aztec_text_process(const unsigned char source[], const size_t src_len
char current_mode;
int count;
char next_mode;
char *reduced_source;
unsigned char *reduced_source;
char *reduced_encode_mode;
int reduced_length;
int byte_mode = 0;
encode_mode=(char*)malloc(src_len + 1);
reduced_source=(char*)malloc(src_len + 1);
reduced_source=(unsigned char*)malloc(src_len + 1);
reduced_encode_mode=(char*)malloc(src_len + 1);
if ((!encode_mode) ||
@ -149,7 +149,7 @@ static int aztec_text_process(const unsigned char source[], const size_t src_len
}
for (i = 0; i < src_len; i++) {
if (source[i] > 128) {
if (source[i] >= 128) {
encode_mode[i] = 'B';
} else {
encode_mode[i] = AztecModes[(int) source[i]];
@ -268,7 +268,6 @@ static int aztec_text_process(const unsigned char source[], const size_t src_len
current_mode = 'U';
for(i = 0; i < reduced_length; i++) {
// Resolve Carriage Return (CR) which can be Punct or Mixed mode
if (reduced_source[i] == 13) {
count = count_cr(reduced_source, i, reduced_length);
@ -576,7 +575,12 @@ static int aztec_text_process(const unsigned char source[], const size_t src_len
current_mode = 'U';
for(i = 0; i < reduced_length; i++) {
if (reduced_encode_mode[i] != current_mode) {
if (reduced_encode_mode[i] != 'B') {
byte_mode = 0;
}
if ((reduced_encode_mode[i] != current_mode) && (!byte_mode)) {
// Change mode
if (current_mode == 'U') {
switch (reduced_encode_mode[i]) {
@ -615,6 +619,7 @@ static int aztec_text_process(const unsigned char source[], const size_t src_len
bin_append(29, 5, binary_string); // M/L
break;
case 'P':
bin_append(29, 5, binary_string); // M/L
bin_append(30, 5, binary_string); // P/L
break;
case 'p':
@ -709,10 +714,10 @@ static int aztec_text_process(const unsigned char source[], const size_t src_len
break;
}
}
// Byte mode length descriptor
if ((reduced_encode_mode[i] == 'B') && (!byte_mode)) {
for (count = 0; ((i + count) < reduced_length) && (reduced_encode_mode[i] == 'B'); count++);
for (count = 0; ((i + count) < reduced_length) && (reduced_encode_mode[i + count] == 'B'); count++);
if (count > 2079) {
return ZINT_ERROR_TOO_LONG;
@ -729,10 +734,6 @@ static int aztec_text_process(const unsigned char source[], const size_t src_len
byte_mode = 1;
}
if ((reduced_encode_mode[i] != 'B') && byte_mode) {
byte_mode = 0;
}
if ((reduced_encode_mode[i] != 'B') && (reduced_encode_mode[i] != 'u') && (reduced_encode_mode[i] != 'p')) {
current_mode = reduced_encode_mode[i];
}
@ -1176,6 +1177,7 @@ int aztec(struct zint_symbol *symbol, unsigned char source[], const size_t lengt
adjusted_string[adjusted_length - 1] = '0';
}
/*
if (debug) {
printf("Codewords:\n");
for (i = 0; i < (adjusted_length / codeword_size); i++) {
@ -1185,6 +1187,7 @@ int aztec(struct zint_symbol *symbol, unsigned char source[], const size_t lengt
printf("\n");
}
}
*/
} while (adjusted_length > data_maxsize);
/* This loop will only repeat on the rare occasions when the rule about not having all 1s or all 0s