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435a566751
* sumatrapdf - vendor import * everything compiles (libjpeg, poppler, fitz, sumatrapdf) * does NOT link (remove the comment tags in the parent directory.rbuild file (rosapps dir) to build it) svn path=/trunk/; revision=29295
129 lines
2.2 KiB
C
129 lines
2.2 KiB
C
#include "fitz-base.h"
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#include "fitz-stream.h"
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typedef struct fz_a85d_s fz_a85d;
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struct fz_a85d_s
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{
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fz_filter super;
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unsigned long word;
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int count;
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};
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static inline int iswhite(int a)
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{
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switch (a) {
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case '\n': case '\r': case '\t': case ' ':
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case '\0': case '\f': case '\b': case 0177:
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return 1;
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}
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return 0;
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}
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fz_error *
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fz_newa85d(fz_filter **fp, fz_obj *params)
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{
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FZ_NEWFILTER(fz_a85d, f, a85d);
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f->word = 0;
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f->count = 0;
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return nil;
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}
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void
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fz_dropa85d(fz_filter *f)
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{
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}
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fz_error *
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fz_processa85d(fz_filter *filter, fz_buffer *in, fz_buffer *out)
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{
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fz_a85d *f = (fz_a85d*)filter;
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int c;
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while (1)
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{
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if (in->rp == in->wp)
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return fz_ioneedin;
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c = *in->rp++;
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if (c >= '!' && c <= 'u') {
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if (f->count == 4) {
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if (out->wp + 4 > out->ep) {
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in->rp --;
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return fz_ioneedout;
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}
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f->word = f->word * 85 + (c - '!');
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*out->wp++ = (f->word >> 24) & 0xff;
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*out->wp++ = (f->word >> 16) & 0xff;
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*out->wp++ = (f->word >> 8) & 0xff;
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*out->wp++ = (f->word) & 0xff;
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f->word = 0;
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f->count = 0;
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}
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else {
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f->word = f->word * 85 + (c - '!');
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f->count ++;
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}
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}
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else if (c == 'z' && f->count == 0) {
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if (out->wp + 4 > out->ep) {
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in->rp --;
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return fz_ioneedout;
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}
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*out->wp++ = 0;
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*out->wp++ = 0;
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*out->wp++ = 0;
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*out->wp++ = 0;
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}
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else if (c == '~') {
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if (in->rp == in->wp) {
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in->rp --;
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return fz_ioneedin;
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}
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c = *in->rp++;
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if (c != '>') {
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return fz_throw("ioerror: bad eod marker in a85d");
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}
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if (out->wp + f->count - 1 > out->ep) {
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in->rp -= 2;
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return fz_ioneedout;
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}
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switch (f->count) {
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case 0:
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break;
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case 1:
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return fz_throw("ioerror: partial final byte in a85d");
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case 2:
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f->word = f->word * (85L * 85 * 85) + 0xffffffL;
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goto o1;
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case 3:
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f->word = f->word * (85L * 85) + 0xffffL;
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goto o2;
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case 4:
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f->word = f->word * 85 + 0xffL;
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*(out->wp+2) = f->word >> 8;
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o2: *(out->wp+1) = f->word >> 16;
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o1: *(out->wp+0) = f->word >> 24;
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out->wp += f->count - 1;
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break;
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}
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out->eof = 1;
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return fz_iodone;
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}
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else if (!iswhite(c)) {
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return fz_throw("ioerror: bad data in a85d: '%c'", c);
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}
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}
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}
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