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Improved implementation of Annex P

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More closely matches layout of ISO standard for ease of checking and includes corrections
This commit is contained in:
Robin Stuart 2016-01-16 16:45:08 +00:00
parent ffc4c14e45
commit 6fc43786a1
1 changed files with 1076 additions and 1051 deletions
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99
backend/dmatrix.c
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@ -43,6 +43,7 @@
#include <ctype.h> #include <ctype.h>
#include <string.h> #include <string.h>
#include <assert.h> #include <assert.h>
#include <math.h>
#ifdef _MSC_VER #ifdef _MSC_VER
#include <malloc.h> #include <malloc.h>
#endif #endif
@ -262,11 +263,10 @@ void insert_value(unsigned char binary_stream[], int posn, int streamlen, char n
int look_ahead_test(unsigned char source[], int sourcelen, int position, int current_mode, int gs1) int look_ahead_test(unsigned char source[], int sourcelen, int position, int current_mode, int gs1)
{ {
/* A custom version of the 'look ahead test' from Annex P */ /* 'look ahead test' from Annex P */
/* This version is deliberately very reluctant to end a data stream with EDIFACT encoding */
float ascii_count, c40_count, text_count, x12_count, edf_count, b256_count, best_count; float ascii_count, c40_count, text_count, x12_count, edf_count, b256_count, best_count;
int sp, done, best_scheme; int sp, best_scheme;
/* step (j) */ /* step (j) */
if(current_mode == DM_ASCII) { if(current_mode == DM_ASCII) {
@ -295,47 +295,72 @@ int look_ahead_test(unsigned char source[], int sourcelen, int position, int cur
for(sp = position; (sp < sourcelen) && (sp <= (position + 8)); sp++) { for(sp = position; (sp < sourcelen) && (sp <= (position + 8)); sp++) {
//if(source[sp] <= 127) { reduced_char = source[sp]; } else { reduced_char = source[sp] - 127; } /* ascii ... step (l) */
if ((source[sp] >= '0') && (source[sp] <= '9')) {
ascii_count += 0.5;
} else {
if (source[sp] > 127) {
ascii_count = ceil(ascii_count) + 2.0;
} else {
ascii_count = ceil(ascii_count) + 1.0;
}
}
/* ascii */ /* c40 ... step (m) */
if((source[sp] >= '0') && (source[sp] <= '9')) { ascii_count += 0.5; } else { ascii_count += 1.0; } if ((source[sp] == ' ') || (((source[sp] >= '0') && (source[sp] <= '9')) || ((source[sp] >= 'A') && (source[sp] <= 'Z')))) {
if(source[sp] > 127) { ascii_count += 2.0; } c40_count += (2.0 / 3.0);
} else {
if (source[sp] > 127) {
c40_count += (8.0 / 3.0);
} else {
c40_count += (4.0 / 3.0);
}
}
/* c40 */ /* text ... step (n) */
done = 0; if ((source[sp] == ' ') || (((source[sp] >= '0') && (source[sp] <= '9')) || ((source[sp] >= 'a') && (source[sp] <= 'z')))) {
if(source[sp] == ' ') { c40_count += (2.0 / 3.0); done = 1; } text_count += (2.0 / 3.0);
if((source[sp] >= '0') && (source[sp] <= '9')) { c40_count += (2.0 / 3.0); done = 1; } } else {
if((source[sp] >= 'A') && (source[sp] <= 'Z')) { c40_count += (2.0 / 3.0); done = 1; } if (source[sp] > 127) {
if(source[sp] > 127) { c40_count += (8.0 / 3.0); } text_count += (8.0 / 3.0);
if(done == 0) { c40_count += (4.0 / 3.0); } } else {
text_count += (4.0 / 3.0);
}
}
/* text */ /* x12 ... step (o) */
done = 0; if (isx12(source[sp])) {
if(source[sp] == ' ') { text_count += (2.0 / 3.0); done = 1; } x12_count += (2.0 / 3.0);
if((source[sp] >= '0') && (source[sp] <= '9')) { text_count += (2.0 / 3.0); done = 1; } } else {
if((source[sp] >= 'a') && (source[sp] <= 'z')) { text_count += (2.0 / 3.0); done = 1; } if (source[sp] > 127) {
if(source[sp] > 127) { text_count += (8.0 / 3.0); } x12_count += (13.0 / 3.0);
if(done == 0) { text_count += (4.0 / 3.0); } } else {
x12_count += (10.0 / 3.0);
}
}
/* x12 */ /* edifact ... step (p) */
done = 0; if ((source[sp] >= ' ') && (source[sp] <= '^')) {
if(isx12(source[sp])) { x12_count += (2.0 / 3.0); done = 1; } edf_count += (3.0 / 4.0);
if(source[sp] > 127) { x12_count += (13.0f / 3.0f); done = 1; } } else {
if(done == 0) x12_count += (10.0f / 3.0f); if (source[sp] > 127) {
edf_count += (17.0 / 4.0);
} else {
edf_count += (13.0 / 4.0);
}
}
if (gs1 && (source[sp] == '[')) {
edf_count += 6.0;
}
/* step (p) */ /* base 256 ... step (q) */
/* edifact */ if (gs1 && (source[sp] == '[')) {
done = 0; b256_count += 4.0;
if((source[sp] >= ' ') && (source[sp] <= '^')) { edf_count += (3.0f / 4.0f); done = 1; } } else {
if(source[sp] > 127) { edf_count += (17.0f / 4.0f); done = 1; } b256_count += 1.0;
if(done == 0) edf_count += (13.0f / 4.0f); }
/* step (q) */
/* b256 */
if(gs1 && (source[sp] == '[')) { b256_count += 4.0; } else { b256_count += 1.0; }
/* printf("%c lat a%.2f c%.2f t%.2f x%.2f e%.2f b%.2f\n", source[sp], ascii_count, c40_count, text_count, x12_count, edf_count, b256_count); */ /* printf("%c lat a%.2f c%.2f t%.2f x%.2f e%.2f b%.2f\n", source[sp], ascii_count, c40_count, text_count, x12_count, edf_count, b256_count); */
} }
best_count = ascii_count; best_count = ascii_count;