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129 lines
2 KiB
C
129 lines
2 KiB
C
#include "fitz-base.h"
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#include "fitz-stream.h"
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typedef struct fz_a85e_s fz_a85e;
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struct fz_a85e_s
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{
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fz_filter super;
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int c;
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};
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fz_error *
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fz_newa85e(fz_filter **fp, fz_obj *params)
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{
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FZ_NEWFILTER(fz_a85e, f, a85e);
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f->c = 0;
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return nil;
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}
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void
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fz_dropa85e(fz_filter *f)
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{
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}
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fz_error *
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fz_processa85e(fz_filter *filter, fz_buffer *in, fz_buffer *out)
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{
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fz_a85e *f = (fz_a85e*)filter;
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unsigned long word;
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int count;
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int n;
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n = 0;
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while (1)
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{
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if (f->c >= 70) {
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if (out->wp + 1 > out->ep)
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return fz_ioneedout;
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*out->wp++ = '\n';
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f->c = 0;
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n ++;
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}
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if (in->rp + 4 <= in->wp)
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{
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word = (in->rp[0] << 24) |
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(in->rp[1] << 16) |
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(in->rp[2] << 8) |
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(in->rp[3]);
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if (word == 0) {
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if (out->wp + 1 > out->ep)
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return fz_ioneedout;
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*out->wp++ = 'z';
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f->c ++;
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n ++;
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}
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else {
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unsigned long v1, v2, v3, v4;
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if (out->wp + 5 > out->ep)
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return fz_ioneedout;
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v4 = word / 85;
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v3 = v4 / 85;
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v2 = v3 / 85;
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v1 = v2 / 85;
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*out->wp++ = (v1 % 85) + '!';
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*out->wp++ = (v2 % 85) + '!';
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*out->wp++ = (v3 % 85) + '!';
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*out->wp++ = (v4 % 85) + '!';
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*out->wp++ = (word % 85) + '!';
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f->c += 5;
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n += 5;
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}
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in->rp += 4;
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}
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else if (in->eof)
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{
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unsigned long divisor;
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if (in->rp == in->wp)
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goto needinput; /* handle clean eof here */
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count = in->wp - in->rp;
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if (out->wp + count + 3 > out->ep)
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return fz_ioneedout;
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word = 0;
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switch (count) {
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case 3: word |= in->rp[2] << 8;
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case 2: word |= in->rp[1] << 16;
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case 1: word |= in->rp[0] << 24;
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}
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in->rp += count;
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divisor = 85L * 85 * 85 * 85;
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while (count-- >= 0) {
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*out->wp++ = ((word / divisor) % 85) + '!';
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divisor /= 85;
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}
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*out->wp++ = '~';
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*out->wp++ = '>';
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out->eof = 1;
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return fz_iodone;
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}
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else {
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goto needinput;
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}
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}
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needinput:
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if (in->eof) {
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if (out->wp + 2 > out->ep)
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return fz_ioneedout;
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*out->wp++ = '~';
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*out->wp++ = '>';
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out->eof = 1;
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return fz_iodone;
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}
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return fz_ioneedin;
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}
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